HYDROPNEUMATIC ACCUMULATORS

2014

Courtesy of JAXA

Title:中村工機-P02∼08.ec6 Page:2 Date: 2014/12/15 Mon 09:14:44

Functions & Effects ■ Energy Storage (power compensation) This is the most common usage of the accumulator to store energy from an external pressure source during idle time and to discharge the energy as necessary. Concretely speaking, it is used to make pump/motor size small and also used as an auxiliary power source in emergency, as a hydraulic starter for an internal combustion engine and as aid for pump delivery at the time of high-speed activation of an actuator, etc.

■ Shock absorption of Water hummer and Surge pressure Suddenly shutting off a high-pressure and high-flow pipeline generates large impact pressure. In other cases mechanical shock to an actuator from external may cause fluid vibration and thus damage to equipment. The accumulator mitigates these shocks.

■ Pump pulsation damping Pulse pressure in a single, dual or triple piston pump for high pressure operation makes control of a pressure device difficult. However, by using the accumulator, not only the trouble due to pulse pressure but also the knocking phenomenon due to smallness feeding from a cylinder of a machine tool etc. can be solved.

■ Leak compensation The accumulator compensates for the pressure drop caused by a leak that may occur by keeping an actuator at a fixed position for a long time or by clamping something.

The hydro-pneumatic accumulator is a storage vessel for pressurized fluid that utilizes compressed gas. Energy from compressed gas makes pressured fluid discharge from the vessel. The bladder type accumulator has a soft rubber bag, that separates compressed gas and non-compressed fluid, and gas is charged into the bag. One of big characteristics of the bladder type accumulator is to have many other functions than energy storage. ■ Compensation in temperature change The accumulator reduces the pressure rise in closed pipe-lines under the burning sun and compensates for the pressure drop caused by fluid contraction in cold area.

■ Hydraulic balancing By using the gas pressure in the accumulator as a weight, cylinder friction leads vertical movement of a machine tool head or a television camera.

■ Hydro-pneumatic shock absorption The accumulator serves as a spring for absorbing shock between the body and wheels of a vehicle. In addition, it can be utilized as a pneumatic spring for various squeeze rolls. The accumulator provides lessfatigue and high absorption efficiency of impact energy as compared to a spring.

■ Transfer barrier This is the method to transfer the hydraulic pressure from one side to the other without mixing each fluid. In this method, the accumulator serves as a gas compressor or transfers corrosive fluid. In order to reduce the accumulator pressure change caused by charging or discharging fluids, the accumulator can also be operated with low differential pressure by increasing its gas chamber volume.

■ Fluid supply The accumulator is used for supplying lubrication oil in emergency or used as a portable oil lubricator.

2 ●

Title:中村工機-P02∼08.ec6 Page:3 Date: 2014/12/15 Mon 09:14:46

SYMBOL

COMMON

Accumulator Volume Calculation

△ V : Available Discharge Volume of Acc. () P1: Precharge Pressure (MPa・A) P2: Min Working Pressure (MPa・A) P3: Max Working Pressure (MPa・A) n : Polytropic Exponent at Discharge time (Per Graph Below) m : Polytropic Exponent at Charge time (m=n-0.2) V1: Accumulator Gas Volume ()

Energy Storage

FORMULA

CALCULATION

Surge Absorption

P ( P ) V= P − 1 P ( ) P P − 1 P × V (P ) △ V= P P (P ) 3

△ V × P2× 3

Pulsation Dampening

1 m

1 n

1 n

PA : Nomal Working Pressure (MPa・A) PX : Average Working Pressure (MPa・A) PB   Max Allowable Pressure (MPa・A) Pm M : Mass of Fluid in Line (㎏) υ : Flow Velocity (m/sec) q : Pump Delivery per a Revolution (/rev) F1 : Pump Coefficient (See the graph below.)

M ×υ2× (n − 1) V1= P B  n−n 1 2000×P1× − 1 P A

V1=

( )

( ) 1− P (P )

Pχ q × F1 P1 1 χ n m

Pump Type Simplex Duplex Triplex

2

F1 : Pump Coefficient

1 m

Note : P1=0.6P X

Quadruplex

Note :

Note: Assuming the discharge/charge time as “1 or less”, “n” is Quintuple In isothermal change, n=m=1. found from the average pressure value in the graph below.

F1

single acting double acting single acting double acting single acting double acting single acting double acting single acting double acting

0.6  0.25 0.25 0.15 0.13 0.06 0.10 0.06 0.06 0.02

LIMIT

(1)The magnitude relationship of pressure should be 0.25 × (P3 or PB or Pm ) ≦ P ≦ 0.9 × (P2 or PA or PX ). (2) In case of n < m in energy storage, make the value of“n”as“m”(but it should be over 1) Polytropic Change & Exponent Graph (Check the exponent value from the discharge/charge time and the average pressure value.) 30

2.4(2.2) 2.3(2.1) 2.2(2.0) 2.1(1.9)

25

2.0(1.8) 1.9(1.7) 1.8(1.6) 15

1.7(1.5)

10

1.6(1.4)

1.5(1.3)

1or less

1.4(1.2)

1.3(1.1)

Polytropic exponent n, m →

        P2+P3 Average pressure    (MPa・A) →          2

20

1.2

1.1(1.0)

1or less

2

3

4

5

6 7 8 9

10

20

30

40

50

60708090 100

200

Discharge time, Charge time (sec) →

300 400

500

600

800 700 900

1000

1.0 2000 3000 4000

Discharge time (P3 → P2) Charge time (P2 → P3)

↑  ↑   n  (m)

Example: 1. On the assumption that the discharge time is 5sec and the average pressure is 5MPa, the polytropic exponent is 1.41. 2. On the assumption that the charge time is 5sec and the average pressure is 5MPa, the polytropic exponent is 1.21. Note: Refer to the above broken lines.

3 ●

Title:中村工機-P02∼08.ec6 Page:4 Date: 2014/12/17 Wed 17:53:10

Exercise 1, Energy Storage :  Operate a 500kN press machine, that ram diameter is φ200mm. The stroke is 115mm, the work time is 1.5sec and the idle time for removing the work is 2min. On the premise of the above, we compare two cases, Case 1 is to use a pump and a motor only and Case 2 is to add an accumulator to them. How will the size change? The answer is shown in Table 1. < Case 1: Pump and Motor only > << Case 1: Calculation >>                  500 × 103N Ram dia. 200mm, Required pressure=       =15.92 ≒16MPa (Ram area=202 × 0.785=314 )                  314 × 102 Fluid required for 1 stroke=314 × 11.5㎝=3,611cc=3.7                  3.7 Fluid volume required in a second=    =2.47/sec                 1.5 sec Flow volume required in a minute=2.47 × 60=148.2/min ≒ 149/min       149 /min × 16 MPaG   39.0 Motor= ≒    ≒ 47.6 kW ≒ 55 kW     61.2 × η ρ(Pump Efficiency)    0.82 << Case 1: Result >> The required fluid volume of the pump = 149/min, The required pressure = 16MPa or more, Motor capacity = 55kW

< Case 2: Pump, Motor and Accumulator >  If an accumulator is added to the system, there are two approaches (Formula: Press power=Pressure × Ram dimension). One method is to adopt the press cylinder with a larger bore in consideration of the pressure drop (P3 → P2) during fluid discharge(in case of the bladder type accumulator). Another method is to design the accumulator’s max working pressure such that its minimum pressure of the accumulator becomes to 16MPaG at the end of discharge(in this case, the max pressure is designed as 21.5MPaG). Let us work on the latter example. In this case, the accumulator with the max pressure of 21.5MPaG and the pump with 21.5MPaG power are used together. The calculation for pump and motor size is as follows, << Case 2: Calculation >>    △ V × P2(P3/P2)1/m Table 1:Comparison table of Case 1 and Case 2 V1=                 P1 (P3/P2)1/n − 1 Case 1 Case 2 Notes : ◎ On the pressure, convert (MPaG+0.1) into MPaA Required pressure 16MPaG 21.5MPaG ◎ Refer to following item f as to P1 Pump 149/min 1.9/min    3.7 × 16.1(21.6/16.1)1/1.28 =32.5 ≒ 33 V1=   1/1.85 Motor 55kW 1.1kW     13.4 (21.6/16.1) − 1 Accumulator None 33              3.7 Flow rate to accumulator=   =1.9/min              2min      1.9 /min × 21.5 MPaG ≒ 1.1kW Motor=            =0.82kW         61.2 × 0.82 << Case2: Result >> The required pressure: 1.35 times bigger than Case1, The pump volume: 1/79 size of Case 1, The motor size: 1/50 size of Case 1. < The sample procedure to select the accumulator model for exercise 1 > a. As the required pressure is 21.5MPaG, the model shall be G230 or T230 (Ref. pages 8 and 9). b. As the calculated gas volume is 33, the nominal gas volume is 30 (Ref. pages 8 and 9). c. As the required fluid volume is 149/min, it is within the range of the max allowable discharge flow shown in the G/T series (Ref. pages 8 and 9). d. If the fluid is mineral oil/water-glycol and the working temperature is under 80℃, the bladder material is NBR #20 (Ref. page 6). e. If a flange is used for piping, the oilport flange’s type is OPE-D32 with a mating flange (Ref. page 16). As a result of the above (a. ∼ e.), the accumulator model shall be“G/T230-30-20-OPF-D32 with a mating flange”. f. Confirmation of the Precharge pressure (P1) As the basic information, the higher the pre-charge pressure (P1) is, the bigger △ V increases. At the same time, P1 should be within the range of P1 < 0.9 × P2. Taking into consideration the case that the fluid temperature may increase during operation, P1 shall be designed as consistently less than 90% of P2. If P1 becomes higher than P2, the bladder lifetime will be short.   Absolute temperature at precharging P1=                 × 0.9 × P2  273+26 =    × 0.9 × 16.1=13.4 MPaA ~    Max absolute temperature  273+50 When the value of P1 is 13.3MPaG, ⊿V shall be 3.7 .

4 ●

Title:中村工機-P02∼08.ec6 Page:5 Date: 2014/12/15 Mon 09:14:47

Exercise 2, Pulsation Damping :  The calculation formula to select the accumulator model for pulsation damping is as follows, < Conditions Precedent > Symbol P1 Px Pm N Q F1 q n

Meaning Precharge pressure Average working pressure Max allowable pressure Pump type Revolution of pump Pump delivery Pump coefficient Pump delivery per revolution Polytropic exponent

Details 1 3MPaG 5MPaG Px +3% = 5.15MPaG Simplex & Single acting 62rpm 32/min 0.6 Q/N Average pressure = 5.1MPaA

Details 2 3.1MPaA 5.1MPaA 5.25MPaA

32/62 1.51

< Calculation Formula > V1=

( ) = 62 × 0.6 ×(3.1)=26.8 5.1 1− P (P ) 1 −(5.25 )

Pχ q・F1・ P1

32

1 χ n

5.1

1/1.51

< Result >  The gas volume of the accumulator to control pulsation within ±3% of the average working pressure is 26.8. For your information, the pump delivery per a revolution can also be calculated by checking the pump plunger size and its stroke. a. Refer to Exercise 1 for accumulator model selection. b. Refer to page 7 for the effects of pulsation damping.

Exercise 3, Surge Pressure Absorption :  The calculation to get the required gas volume of the accumulator for surge pressure absorption is as follows, (Purpose & Situation: Absorbing the surge pressure due to sudden closing of the valve in the pipe end.) < Conditions Precedent > Symbol L

Meaning Total length of oil piping

D

External diameter of piping

d Q PA PB P1 υ n ρ

Internal diameter of piping Fluid volume Normal pipe-line pressure Max allowable pressure Precharge Pressure Flow velocity Polytropic exponent Fluid specific gravity

Details 1 8B × Sch40 (JIS : 216.3mm × Thickness 8.2mm) 216.3mm8.2mm8.2mm 4500/min 0.53MPaG 1.13MPaG P1 ≦ 0.9 × PA = 0.9 × 0.63MPaA 4/ π× Q/d2 = 21.23 × 4500/199.92 Average pressure=(1.23+0.63)/2 ≦ 1 –

Details 2 700m 216.3mm 199.9mm 0.63MPaA 1.23MPaA 0.53MPaA 2.4m/sec 1.405 900kg/m3

< Calculation Formula >    π      π M= d2・L・ ρ = × (199.9 × 10−3)2× 700 × 900=19772㎏      4     4

(M: Mass of fluid in piping line (kg))

M ×υ2× (n − 1) 19772 × 2.42× (1.405-1) = P B n1 1.23 0.2883 = 205 n 2000 × 0.53 × 2000×P1× − 1 − 1 P A 0.63 < Result > The required gas volume of the accumulator is 205. V1=

( )

( )

< Note > Please refer exercise 1 about the procedure of selecting the accumulator model.

5 ●

Title:中村工機-P02∼08.ec6 Page:6 Date: 2014/12/15 Mon 09:14:48

Explanation of Model Symbols G □ 350 − 20 H − 20 − OPF − J − 32 − CG  60M − MT − S7

Mark for NAS cleanliness class in a servo circuitry etc. Select the class from 6, 7 or 8. If standard (not required the class), no mark. MT…Safety device for gas port. If not specified, 60M … Glycerol filled pressure a standard gas gauge for gas port. valve will be CG…Coreless type Gas Port provided. (Ref. page 14). A standard bushing (Rc connection) will be Oilport flange model name(Ref. page 16). provided, if not specified. Nominal diameter of a mating flange

Rubber materials 10 Nitrile rubber (NBR)

Low Temperature

 − 25 to+80℃

20 Nitrile rubber (NBR)

Mineral oil, water glycol

 − 10 to+80℃

30 Epichlorohydrin (CHC)

Gasoline, etc., Aromatic material  − 10 to+90℃

40 Butyl rubber (IIR)

Phosphate ester

28 Fluorocarbon rubber (FKM) Chemical material

 − 10 to+90℃   − 5 to+120℃

Types Standard

Ref. pages 7, 8, and 9

H

High flow type

High flow discharge (Ref pages 8&9)

P

Screen type

Poppetless (Ref. page 11)

B

Transfer barrier type

Transfer of dissimilar fluid (Ref. page 12)

Nominal gas volume of the accumulator ( ) Maximum working pressure (kgf/ ) Surface treatment and Material Mark Contents Parkerizing W

Nickel plating

S

Stainless steel

F

PTFE coating

Fluid type Material For mineral oil and water glycol For Water, etc.

Shell : Nickel plating Connection : Stainless steel Shell&Connection: Stainless steel Shell inside: PTFE coated Connection: Stainless steel

Accumulator Series

6 ●

M

Miniorator Series

Small volume type

Ref. page 7

G

General Series

Standard type

Ref. page 8

T

Twin Open Series

Open top type

Ref. page 9

D

Damper Series

In-line type

Ref. page 10

Title:中村工機-P02∼08.ec6 Page:7 Date: 2014/12/15 Mon 09:14:49

M-Series MINIORATOR

Model

M210

Spec.

Max. W.P

20.6MPa

Gas type

N2 gas

Precharge pressure limits Instailation Surface treatment

Model symbols

0.25 × P3 < P1 < 0.9 × P2 (P1=Precharge pressure, P2=Min working pressure, P3=Max working pressure) Vertically (Oil side is downward) Fluid = Oil : Parkerizing Fluid = Water, etc. : Nickel plating Note: Stainless steel type is shown in page 13. 20. (NBR)Mineral Oil M 210−1−20        Rubber        40. (IIR)Phosphate Ester        Materials        28. (FKM)Chemical Material         Nominal gas volume of accumulator ()         Max working pressure         Series

Dimensions Max W.P. Gas volume

Mass

A

UD

D

B

(MPa)

(㎏)

(mm)

(mm)

(mm)

(mm)

Model M210-0.1 M210-0.3 M210-0.5

20.6

M210-1

()

E (mm)

Max allowable discharge flow (/min)

F

0.115

2.0

232

74

60.5

85

Rc1/4

62

0.29 

5.0

286

94

76.3

85

35

Rc3/4

92

0.5  

6.3

376

94

76.3

85

35

Rc3/4

92

1.0  

12.5

398

124

107.9

85

10

Rc3/4

260

◎ Maximum allowable discharge flow is designed to avoid the stopper’s chattering phenomenon due to pressurized fluid. ◎ Maximum allowable discharge flow is designed in the case where the fluid material is mineral oil VG46.

■ Examples in Pulsation damping effects

(A) Without   ACC.

(B) With ACC.

Ex.1 0.5bladder type ACC.

(A) Without   ACC.

(B) With ACC.

Ex.2 0.5bladder type ACC.

7 ●

Title:中村工機-P02∼08.ec6 Page:8 Date: 2014/12/15 Mon 09:14:50

G-Series GENERAL SERIES

Spec.

Model

Max. W.P.

G175

G230

G300

G350

17.2MPa

22.6MPa

29.5MPa

34.4MPa

Gas type

N2 gas

Precharge 0.25 × P3 < P1 < 0.9 × P2 pressure (P1=Precharge pressure, P2=Min working pressure, P3=Max working pressure) limits Installation Vertically (Oil side is downward) Fluid = Oil : Parkerizing Surface Fluid = Water, etc. : Nickel plating treatment Note: Stainless steel type is shown in page 13. 10. (NBR)Low Temperature G 230−10 H−20 20. (NBR)Mineral Oil         Rubber 30. (CHC)Aromatic Material         Materials 40. (IIR)Phosphate Ester 28. (FKM)Chemical Material Model         Hi-Flow TYPE symbols         Nominal gas volume of the accumulator ()         Max working pressure         Series Dimensions Model

G175−1     −2.5     −4     −5     −10     −20     −30     −50     −60 G175−10H     −20H     −30H     −50H     −60H G230−10     −20     −30     −50     −60     −10H     −20H     −30H     −50H     −60H G300−1     −2.5     −4     −5 G350−1     −10     −20     −30     −50     −60     −10H     −20H     −30H     −50H     −60H

Max W.P. Gas volume Mass (MPa) () (㎏) 1.2 9 2.4 15 3.7 18 4.7 20 12.0 44 20.8 61 37.2 96 17.2 53.1 128 64.7 152 11.3 59 20.1 76 36.5 111 52.4 143 64.0 167 10.6 55 19.0 79 34.0 127 48.5 172 59.4 206 22.6 9.9 70 18.5 94 33.6 142 48.1 187 58.7 221 1.2 10 29.5 2.4 20 3.6 19 29.4 4.6 22 1.2 10 10.1 65 19.0 102 34.2 163 49.3 219 34.4 60.0 262 9.4 80 18.3 117 33.5 178 48.7 234 59.3 277

A (mm) 391 577 474 536 660 933 1444 1952 2318 649 922 1433 1941 2307 662 935 1446 1954 2320 653 926 1437 1945 2311 391 577 458 514 391 647 945 1456 1964 2322 633 931 1442 1950 2308

B (mm)

C (mm)

107

64

106 89

D E F (mm) (mm) 118    Standard unit 120    10 comes with a 168.3 bushing Rc3/4 connection. As to a flange 15 connection, refer to page 16. 232    Connection is flange

Max allowable discharge flow (/min)

OPF-S

108

1400

3600

(Ref. to page 16)

101 89

232   

Standard unit comes with a bushing Rc3/4 15 connection. As to a flange connection, refer to page 16.

1400

Connection is flange OPF-S or OPF-J

103

3600

(Ref. to page 16) 107

64

107

64

120    127    177.8 120   

101 89

241.8 103

Standard unit 10 comes with a bushing Rc3/4 connection. As to a flange 15 connection, refer to page 16.

342

1400

Connection is flange OPF-J (Ref. to page 16)

◎Refer to page 16 for flange connection. ◎Maximum allowable discharge flow is designed in the case where the fluid material is mineral oil VG46.

8 ●

342

3600

Title:中村工機-P09∼17.ec6 Page:9 Date: 2014/12/15 Mon 09:21:29

T-Series TWIN OPEN SERIES ■ Features : A large opening is provided on the top for ease of maintenance. Because the bladder is pear-shaped to expand and contract easily, the excessive deformation tends not to occur and the life span is long. The bladder body doesn’t have a seal structure, so special skill for maintenance is not required. In the way of customer’s convenience the bladder can be replaced from both ports in top and bottom. The shell body has assembly structure without screw clamps, so customer is free from stripped screws trouble in disassembly. ■Model symbols : T 175 − 10  H − 20

10. (NBR) Low Temperature 20. (NBR) Mineral Oil Rubber 30. (CHC) Aromatic Material Materials 40. (IIR) Phosphate Ester Hi-Flow TYPE 28. (FKM) Chemical Material Nominal gas volume of the accumulator ( ) Max working pressure Series

Dimensions Model T175−10    −20    −30    −50    −60    −10H    −20H    −30H    −50H    −60H T230−10    −20    −30    −50    −60    −10H    −20H    −30H    −50H    −60H T350−10    −20    −30    −50    −60    −10H    −20H    −30H    −50H    −60H T120−40    −58    −80    −120    −180 T175−40    −58    −80    −120    −170 TL175−170    −230 T230−40    −58    −75    −120    −170 TL230−160    −220 T350−40    −58    −70    −100    −160 TL350−160    −220

Max W.P. (MPa)

17.2

22.6

34.4

11.8

17.2

22.6

34.4

Gas volume () 11.6 20.4 36.8 52.7 64.3 10.9 19.7 36.1 52.1 62.6 10.3 18.8 33.8 48.3 59.0 9.6 18.2 33.2 47.7 58.3 9.7 18.6 33.8 48.9 59.6 9.6 17.9 33.1 48.3 58.9 43.0 61.0 79.0 127.0 183.0 41.0 58.0 75.0 120.0 170.0 167.0 222.0 37.0 54.0 70.0 112.0 164.0 157.0 213.0 35.0 51.0 66.0 103.0 155.0 152.0 205.0

Mass (㎏) 45 62 97 129 153 60 77 112 144 168 56 80 128 173 207 71 95 143 188 222 67 104 165 221 264 84 119 180 236 279 110 136 162 234 316 155 192 227 323 439 423 549 177 222 270 391 535 531 689 214 267 321 459 636 609 792

A (mm) 673 946 1457 1965 2331 662 935 1446 1954 2320 673 946 1457 1965 2331 664 937 1448 1956 2322 657 955 1466 1974 2332 663 941 1452 1960 2318 918 1144 1364 1968 2666 918 1144 1364 1956 2670 2046 2652 918 1144 1364 1956 2670 2056 2662 918 1144 1364 1950 2700 2056 2662

B (mm)

C (mm)

D (mm)

106

E (mm)

F

15

Standard unit comes with a bushing Rc3/4 connection. As to a flange connection, refer to page 16.

110

Max allowable discharge flow(/min)

1400

Connection is flange 108

3600

OPF-S (Ref. to page 16) 232 

101

15

Standard unit comes with a bushing Rc3/4 connection. As to a flange connection, refer to page 16.

1400

Connection is flange 103

OPF-S or OPF-J

3600

(Ref. to page 16) 107 101

15 241.8

Standard unit comes with a bushing Rc3/4 connection. As to a flange connection, refer to page 16.

1400

103

110

108

355.6

Connection is flange OPF-S (Ref. to page 16)

105

103

355.6

102

100

406.4

105

103

355.6

102

100

406.4

3600

Connection is flange OPF-S or OPF-J (Ref. to page 16)

105

103

355.6

102

100

406.4

◎ Refer to page 16 for flange connection. ◎ Maximum allowable discharge flow is designed in the case where the fluid material is mineral oil VG46.

9 ●

Title:中村工機-P09∼17.ec6 Page:10 Date: 2014/12/15 Mon 09:21:30

Damper series (In-line type) Accumulator

D-Series

Flow

Across Flats 55

■ Features : ●Because the fluid directly flows along the surface of the bladder, the bladder can absorb high frequency pulsations. ●A valid and feasible model for prevention of water hammer, surge pressure and noise, etc. ●Because the accumulator is directly installed into pipe-line, customer can save the space and this alleviate concern about contamination due to fluid residence. ●The bladder body doesn’t have a seal structure, so special skill for maintenance is not required. ■Model symbols : D 215 − 02 − 20

Rubber 20. (NBR) Mineral Oil 40. (IIR) Phosphate Ester Materials 28. (FKM) Chemical Material

Nominal gas volume of the accumulator ( ) Max working pressure Series

Model

Dimensions

D215-02 D215-1.5

Max W.P. (MPa)

21.0

Gas volume ()

Mass (㎏)

A (mm)

B (mm)

0.19

8.0

328

131

Rc 1

167

   40A Flange    Connection

1.2

33.0

400

C

D (mm)

Max allowable flow rate (/min)

80 

140

154

420

◎If flange connection is applied, the position of the bolt-hole of each flange is different in rotation direction.  The mating flanges and the seal parts will be provided. ■Example in Pulsation damping effects

(A) Without   ACC.

1 0 ●

(B) With ACC.

Title:中村工機-P09∼17.ec6 Page:11 Date: 2014/12/15 Mon 09:21:31

P-Type Screen Type Accumulator  Screen type can be applied to G series and T series. Screen type has a plate with many small holes to allow fluid to pass through, in lieu of a poppet valve placed at the oil port. Max allowable precharge pressure is 0.75MPaG and the bladder of this type is free from damage due to a poppet even if the fluid pressure will be under the precharge pressure or be same to atmosphere pressure. This type is widely used for surge pressure damping in a water pipeline at lowpressure use or in pipelines in petrochemical industries, etc.

Screen type in General series ■Model symbols : G 30 − 10 P − 20 −  For a bushing connection, specify Rc diameter. For a flange connection, specify the standard and nominal diameter of it. 10. (NBR) Low Temperature Rubber 20. (NBR) Mineral Oil 30. (CHC) Aromatic Material Materials 40. (IIR) Phosphate Ester 28. (FKM) Chemical Material P-Screen type Nominal gas volume of the accumlator ( ) Max working pressure (3.0 MPa) Series If the Twin Open Series is required, indicate “T”.

Dimensions Model

G30−1P −2.5P −4P −5P G30−10P −20P −30P −50P −60P T30−10P −20P −30P −50P −60P T30−80P −120P −180P

Max W.P. Gas volume Mass (MPa) () (㎏) 1.2 9 2.4 11 3.7 18 4.7 20 11.3 59 20.1 76 36.5 111 52.4 143 3.0 64.0 167 10.9 60 19.7 77 36.1 112 52.1 144 62.6 168 79.0 162 127.0 234 183.0 316

A (mm) 391 577 474 536 649 922 1433 1941 2307 662 935 1446 1954 2320 1364 1968 2666

B (mm)

C (mm)

107

64

D (mm) 118  120.0 168.3

E (mm)

F

Max flow rate (/min)

Bushing height 10 (Ref. to page 8)

Standard unit comes with a bushing Rc3/4 connection. As to a flange connection, refer to page 16.

75

89 232 

Connection is OPF-S.

108

700

(Ref. page 16)

110 355.6

◎ Max flow rate is calculated under the situation where the pressure difference between the accumulator and the pipe line is 1.18MPa. ◎ Max flow rate is designed in the case where the fluid material is mineral oil VG46 at 28℃.

1 1 ●

Title:中村工機-P09∼17.ec6 Page:12 Date: 2014/12/15 Mon 09:21:31

Transfer Barrier Accumulator

Type

B-Type

 Transfer barrier accumulators are used to transfer pressure between different types of fluid, for example, the pressure between oil and water, clean oil and contaminated oil, liquid and gas, etc. A perforated tube is installed into the bladder to prevent the bladder from damage due to the fluid’s direct contact with the interior of the bladder. Concretely speaking, this type accumulator is used to convert oil pressure to water pressure and/or supply oil to a compressor bearing, etc. Transfer Barrier Type in T series ■Model symbols : T 175 − 20 B − 20 −  For a bushing connection, Rc3/4 is provided as standard for both gas and oil port sides. For a flange connection, specify the standard and the nominal diameter of the flange. 10. (NBR) Low Temperature Rubber 20. (NBR) Mineral Oil 30. (CHC) Aromatic Material Materials 40. (IIR) Phosphate Ester 28. (FKM) Chemical Material “B”means Transfer Barrir Type Nominal gas volume of the accumulator ( ) Max working pressure Series If the Gneral Series is required, indicate“G”.

Dimensions Model

G175−20B     −30B     −50B     −60B T 175−20B     −30B     −50B     −60B T 175−80B   −120B   −170B

Max W.P. Gas volume Mass (MPa) () (㎏) 20.8 61 37.2 96 53.1 128 64.7 152 20.4 62 17.2 36.8 97 52.7 129 64.3 153 75.0 227 120.0 323 170.0 439

A (mm) 954 1465 1973 2339 951 1462 1970 2336 1374 1966 2680

B (mm)

C (mm)

D (mm)

E (mm)

106

232

55

F

110 Reference dimension, ASME 150LB 115

1B RF 103

355.6

90

◎In case where the mineral oil VG46 flows at 200/min, the pressure loss of the perforate tube shall be about 0.08MPa. ◎The bladder’s compression ratio shall be within (0.2P3≦P1≦0.9P2) or within (V3≧0.2V1, V2≦0.9V1).

12 ●

Title:中村工機-P09∼17.ec6 Page:13 Date: 2014/12/15 Mon 09:21:32

Stainless Steel Accumulator

M.G.T. Series

 Recently, accumulator came to be used for not only oil system but also water/special liquid system being operated by high purity washing water, high cleanliness chemical fluid, etc.  For such applications, a stainless steel accumulator is most appropriate.

■ Features : The material is stainless steel that has high anti-corrosiveness such as SUS304, SUS316L, etc. Customer can maintain a high cleanliness level in the lubricating system, the hydraulic system, etc. by using this accumulator. The shell is designed under JISB8358 and is non-weld integral structure made from seamless tube. Titanium (TB480H) bladder type accumulators are also available. The special model with the max working pressure up to 34.4MPaG can be supplied. Stainless Steel Type in G Series ■Model symbols : G S 70 − 50 − 20 −  For flange connection, specify the standard and the nominal diameter of flange. 10. (NBR) Low Temperature Rubber 20. (NBR) Mineral Oil 30. (CHC) Aromatic Material Materials 40. (IIR) Phosphate Ester 28. (FKM) Chemical Material Nominal gas volume of the accumulator ( ) Max working pressure “S”means Stainless Steel Type Series  M − Miniorator Series  G − General Series  T − Twin Open Series Dimensions Model

MS210−0.1 −0.3 −0.5 −1 GS140−1 −2.5 −4 −5 GS70−10 −20 −30 −50 −60 TS70−10 −20 −30 −50 −60 TSL60−100 −170 −240

Max W.P. Gas volume (MPa) () 0.115 0.29 20.6  0.5 1.0 1.0 2.4 13.8  3.4 4.4 12.0 21.3   7.0 38.7 56.1 67.6 11.5 20.8   7.0 38.2 55.6 67.1 101.0 6.0 167.0 237.0

Mass (㎏) 2 5 6.3 10.5 9 12.5 21 24 35 48 76 101 120 37 50 77 103 123 162 240 320

A (mm) 232 286 376 398 391 577 500 558 656 929 1440 1948 2314 665 938 1449 1957 2323 1323 1938 2578

B (mm) 85

107

89

C (mm) 74

D (mm) 60.5

E (mm) −

94

76.3

35

115

100

※ UD Ref. page 7

10

F Rc1/4

64

114.3

104

177

15 comes with a bushing Rc3/4

106

232

connection. 15 As to a flange

Standard unit

connection, refer to page 16. 104

101

232

107

105

406.4

15 A flange connection is OPF-S (Ref. page 16).

◎The dimensions of E and F written in the above table is our standard size. If other standard such as ASME, API, JPI or DIN or other special material is required, please let us know the specification. ◎Please let us know your desired allowable flow rate.

1 3 ●

Title:中村工機-P09∼17.ec6 Page:14 Date: 2014/12/15 Mon 09:21:33

Accessories on gas side 1. Coreless type gas port Pressure gauge Circuit diagram

Stop valve

Bleed plug

REF. 160

Bleed plug

Glycerol filled pressure gauge Stop valve

Coreless valve (N2 gas suppiy port)

Coreless valve

MT or SP TV8(8V1) (N2 gas supply port)

Safety device

Connecting to accumulator, 7/8″-14UNF set screw Accumulator conenecting port

REF. 69.5

■Model symbols : Max. scale of − pressure gauge

G 230 − 50 − 20 − CG

Safety unit Coreless type gas port (Approved by the Japanese High Pressure Gas Safety Act of METI) Type CG

Max working pressure Pressure test value 34.4MPa

Glycerol filled pressure gauge

Rubber materials Nominal gas volume of the accumulator ( ) Max working pressure Series Note: Only a charging hose assembly is required when the coreless type gas port is being installed. In other words, the charging valve assembly is not required when the coreless type gasport is being installed.

Standard max scale value Working presure range 25MPa 0 ∼ 18MPa 40MPa 0 ∼ 25MPa 60MPa 0 ∼ 34.4MPa Not required for 10 or more liters accumulator because this is being installed in the bladder assembly. Safety-unit Type MT SP

2. Charging Assembly : Charging Valve  (VR type) Hose connection

Melting Temperature 105 ± 5℃ Stop plug

Caution in the case where the charging pressure is extremely low pressure. When the charging pressure toVR type gas valve is less than 1MPa, there is possibility not to be able to charge gas into an accumulator due to the cracking pressure of the check valve (core) of the charging valve. Therefore, if the charging pressure is less than 1MPa, please let us know before you order. The charging valve (VRZ type) for extremely low pressure is recommended. If you have any questions, please feel free to contact us.

TV8(8V1) Connecting to accumulator

Charging Hose Assembly

Charging

Max working

Standard

Hose Type TS150 TS400

pressure 14.7MPa 39.2MPa

length 2m 2m

Full length : Approx.2000

14 ●

52MPa

G1/4 for JIS Nitrogen bottle-Type A

W22-14

W23-14 for JIS Nitrogen bottle-Type B

Title:中村工機-P09∼17.ec6 Page:15 Date: 2014/12/15 Mon 09:21:34

■Model symbols :

Circuit diagram

Charging Hose Assembly Charging Valve ↓ ↓ VR ※ TS ※×※ −

Bleed plug

Length

Pressure gauge

  Leave blank if it is standard (2m).

Charging Hose assembly

  Enter the no. of length you desire. Indicate the rated pressure,(kgf/ )-150, 400 Hose Type

Connecting to accumulator, 8V1 (TV8)

Max scale of pressure gauge-(indicated in MPa.) (Pressure gauge size is AT 1/4 ×φ60) Charging Valve type: VR-type for an accumulator with a coreless type gas valve Note: If the charging gas pressure is less than 1MPaG, please let us know before you order.

3. Melting plug : Melting plug is a safety device to protect the accumulator from abnormally high temperature environment.

■ Features : ●Melting plug doesn’t have moving parts, so it is dependable as a safety device. ●Because Melting plug is installed separate from the gas supply valve seat, there is not damage due to charging gases. ●Even if the fuse is melted by fire disaster, the valve-guard prevents the melted piece from blasting off. ●Because Melting plug is being incorporated into the valve stem of bladder, this is renewed by replacing the bladder and no extra space is required. ●Melting plug is safe against external shocks, etc.  Standard melting temperature is 105 ± 5℃. The temperature is designed for the plug to start melting at the time when the accumulated pressure increases higher than the accumulator’s max pressure.  After that, the accumulated gas is discharged from the plug hole and controlled not to greatly exceed the max pressure.  Please take care that there is a possibility the plug starts melting during operation in high temperature environment over 80 ℃, and it leads gas leak. In this case, we recommend to use Melting plug for high temperature, that starts melting at 180 ± 10℃.  To select appropriate safety device, please let us know before you order.

Gas valve assembly

Melting plug

Gasket Fusible metal

N2 gas

1 5 ●

Title:中村工機-P09∼17.ec6 Page:16 Date: 2014/12/15 Mon 09:21:36

OPF Series OIL PORT FLANGE  If a flange connection is applied, we recommend to choose it from models shown in the followings. ■Model symbols : G 230 − 10 − 20 − OPF − B20 (Require a mating flange.) Please indicate the oil port flange model name if applied. In addition, please let us know whether a mating flange is required or not. Blank means to select our standard bushing(Rc3/4). Rubber material Nominal gas volume of the accumulator ( ) Maximum working pressure. Accumulator series. ※ All oil port flange comes with seal parts. For 1 to 60 liter accumulators Oil port flange

Mating flange

Press

Nominal volume

Model

Nominal dia.mm

A B C d1 d2 T G (mm) (mm) (mm) (mm) (mm) (mm)

15(B)  88 45 28 16  22.2 25 M12 1 ∼ 5 OPF-A 20(B)  88 45 28 20  27.7 22 M10 25(1B)  88 48 28 24  34.5 28 M12 15 ( B)   88 45 28 16  22.2 25 M12 20.6 20(B)  88 45 28 20  27.7 22 M10 MPa 25(1B)  88 48 28 25  34.5 28 M12 10 ∼ 60 OPF-B 32(1B)118 56 32 31.5 43.2 28 M12 40(1B)118 65 32 35  49.1 36 M16 50(2B)144 75 40 35  61.1 36 M16 15(B)  88 45 28 16  22.2 25 M12 1 ∼ 5 OPF-C 20(B)  88 48 28 20  27.7 25 M12 25(1B)118 56 32 24  34.5 31 M16 15(B)  88 45 28 16  22.2 25 M12 34.4 20(B)  88 48 28 20  27.7 25 M12 MPa 25(1B)118 56 32 25  34.5 31 M16 10 ∼ 60 OPF-D 32(1B)118 65 32 31.5 43.2 31 M16 40(1B) 144 75 40 35  49.4 39 M20 50(2B)156 84 48 35  61.1 47 M20 ◎ Please let us know whether a mating flange is necessary or not.

H

Mating flange

Standard

G25 G30 G35 G25 G30 G35 G40 G50 G50 G25 G30 G35 G25 G30 G35 G40 G50 G60

NHA15 SHA20 SSA25 NHA15 SHA20 SSA25 SSA32 SSA40 NHA50 NFA15 NFA20 NFA25 NFA15 NFA20 NFA25 NFA32 NFA40 NFA50

Nakamura in-house standard

Mating flange

Standard

JIS B2291 Nakamura in-house standard

JIS B2291

Nakamura in-house standard

For high flow (H type) and 40 to 230 liter accumulators Oil port flange

Mating flange

1 6 ●

Press

Nominal volume

Model

Nominal dia.

A B C d1 d2 T e H (mm) (mm) (mm) (mm) (mm) (mm) (mm)

G

32(1B)φ118   56 44 31.5 43.2 28 16 G40 M12 SSA32 40 ( 1 B) φ 135   65 44 37.5 49.1 36 18 G50 M16 SSA40 20.6 OPF-S 50(2B)φ144   73 44 47.5 61.1 36 20 G60 M16 SSA50 JIS B2291 MPa 65(2B)φ185   92 45 60  77.1 45 22 G75 M20 SSA65 80(3B)φ200 103 45 71  90.0 45 25 G85 M22 SSA80 10H∼ 32(1B)□ 153 110 44 32  43.2 43 18 G80 M24 NHFA32 60H 40(1B)□ 153 110 44 40  49.1 43 20 G80 M24 NHFA40 22.6 in-house and OPF-H 50(2B)□ 153 110 44 50  61.1 43 23 G80 M24 NHFA50 Nakamura standard MPa □ 65(2B) 153 110 44 64  77.1 43 28 G80 M24 NHFA65 40∼ 80(3B)□ 153 110 44 71  90.0 43 31 G80 M24 NHFA80 230 32(1B)□ 176 116 45 32  43.2 44 18 G65 M27 NHFA32J 40(1B)□ 176 116 45 40  49.1 44 20 G65 M27 NHFA40J 34.4 in-house OPF-J 50(2B)□ 176 116 45 50  61.1 44 23 G65 M27 NHFA50J Nakamura standard MPa □ 65(2B) 176 116 45 56  77.1 44 28 G65 M27 NHFA65J 80(3B)□ 176 116 45 56  90.0 44 31 G65 M27 NHFA80J ◎ Please let us know if you need the product in other standard such as ASME, API, JPI, DIN etc. or specify the material.

Title:中村工機-P09∼17.ec6 Page:17 Date: 2014/12/15 Mon 09:21:37

BAB Series HYDRO-LUNG

■ Features :

Directional control valve

●Preventing pollution of the hydraulic fluid ●Preventing evaporation of hydraulic fluid such as water glycol

Breather

HU oil level on cylinder ascent

How to select the model HL (1)Calculate the max displacement of the hydraulic fluid oil level on cylinder descent in the oil reservoir    π Vk =   d2s・10−6    4    Vk : Max displacement of hydraulic fluid ()   d : Diameter of the piston rod (mm)   s : Cylinder stroke (mm) (2) Calculate the max flow rate at the time of the displacement (Vk).    Vk  Q0 =   ・60    Tc    Q0 : Max flow rate (/min)   Tc : Operating time of the cylinder (sec) (3)Comparing the calculated max flow rate with the allowable flow rate, decide the selection method of the accumulator. Q0 ≦ Q Q : Max allowable flow rate (/min)

Hydro-Lung

Fig.1 Example of Hydro-Lung use

Fig.2 Breather

 As a result, when Qo is less than Q, it is needed to select a hydro-lung which maximum displacement is adequate to Vk (Ref. the below model list). But if Qo is more than Q it is better to increase the number of hydro-lungs.  As Fig. 1 Example of Hydro-Lung use, the oil level changes at the same amount as the piston rod volume according to the hydraulic cylinder operation. At the same time, Hydro-lung absorbs the rise and fall in the air chamber. In other words, the bladder of Hydro-lung expands along with increase of the oil-level and constricts according to decrease of the oil-level.  Because a breather valve is equipped, Hydro-lung is effective at the situation also where the oil level greatly changes due to supplying operation oil or replacing devices.  Concretely speaking, the bladder of Hydro-lung constricts along with decrease of the oil-level. After that, the bladder absorbs atmosphere from the vacuum valve ② via filter ③. Conversely, the bladder expands along rise of the oil level or along increase of the pressure in the air chamber. After that, the air discharges to outside through the relief valve ①.  In addition, Hydro-lung can prevent the oil reservoir from the contamination due to external atmosphere since the inside is isolated from the outside.

Breather

Rc3/4 to tank

Model BAB  1 BAB 2.5 BAB  4 BAB 10 BAB 20 BAB 30 BAB 50

Max volume of breath ()

0.8 1.6 2.4 6.0 11.7 21.0 32.0

Max allowable flow rate Q (/min)

47.1 47.1 47.1 152.6 152.6 152.6 152.6

A (mm)

B (mm)

C (mm)

D (mm)

Mass (kg)

167 355 225 376 666 1187 1673

384 572 442 635 925 1446 1932

217 217 217 259 259 259 259

114.3 114.3 165.2 216.3 216.3 216.3 216.3

6 9 10 16 24 38 52

Max W.P. (MPa)

0.03

1 7 ●

Title:中村工機-P18∼21.ec6 Page:19 Date: 2014/12/15 Mon 09:26:46

Accumulator stand  We design and manufacture accumulator stands that several accumulators are put together on in addition to supplying a single accumulator.  Accumulator stands equipped with not only accumulators and the piping but also stop valves, pressure gauges, pressure switches, other hydraulic devices and stainless steel pipes can be provided.  For example, the accumulator stand with deck stand is designed to check the gas pressure or to maintain the accumulator safely and the accumulator stand with adjusting bolts is designed to replace bladder and maintain the accumulator assembly without using hanging tools or machines such as cranes.  The accumulator stand is completely made-to-order, so it is possible to design it in single line, double lines or etc. as customer demand in consideration of customer’s installation space.

● Following pictures are sample model.

18 ●

Title:中村工機-P18∼21.ec6 Page:20 Date: 2014/12/15 Mon 09:26:47

Accumulator stand photos supplied in past

Accumulator stand with 12 sets of 220L accumulator

Accumulator stand with 10 sets of 230L accumulator

(31MPa)

(17MPa)

Accumulator stand with 4 sets of 120L accumulator

Gas cylinder stand with 8 sets of pressure vessel for N2

(1MPa)

gas (20MPa)

1 9 ●

Title:中村工機-P18∼21.ec6 Page:21 Date: 2014/12/15 Mon 09:26:48

PA Series Piston type accumulator  We started to produce piston type accumulators with our own technology in 1967 and after 3 years, ones of 150 liter was supplied to Nippon Steel Corporation Oita factory for their slab continuous casting machine.  Since then they have been widely used by many customers and applications such as the Ministry of Defense in Japan, power plants, hydraulic controls, etc. ■Model symbols :

■ Features :

PA 230 − 20 − 20 − LS

Because low friction packing is used, the slide friction is small.

With a sensor

There is no limitation in the ratio between N2 gas

Seal materials…20. (NBR) for mineral oil

precharge pressure and hydraulic pressure.

       28. (FKM) for Phosphate ester

Large gas volume type and High pressure type

Nominal gas volume of the accumulator ()

can be provided.

Max working pressure Piston type accumulator

Dimensions Max W.P. Model

PA230−20    −40    −60     −100

(MPa)

22.6

Gas Volume Mass ()

20 40 60 100

(㎏)

160 220 490 605

A (mm) 953 1562 1380 1860

B (mm)

C (mm)

D (mm)

2

241.8

16

355.6

87

E (mm) 36

F Standard size is φ49.1 (40A) or less. Please letus know if it is 50A or more as special.

◎ Please let us know the use condition and the operating fluid. ◎ As a special specification, large flow rate type can also be provided. ◎ The accumulator with ASME stamp, CE (PED) mark or Chinese certification can be manufactured. ◎ The accumulator available to flame retardancy oil or chemical fluid can be provided.

2 0 ●

◎ Equivalent accumulator to cleanliness class NAS6 can be provided.

Max

flow rate (/min)

990 2200

Title:中村工機-P18∼21.ec6 Page:22 Date: 2014/12/15 Mon 09:26:49

Piston type accumulator with a sensor

LS Series

 A sensor is being installed inside the piston type accumulator to comply with hydraulic systems electronically controlled, and it outputs

Controller

electric signals continuously and detects the position of the piston of

Output signal

the accumulator.

■ Features :

Power source

Detecting the position of the piston continuously. Because the available discharge amount can be confirmed by detecting the piston position, it is possible to forecast the maintenance inspection time. The sensor is placed at a non-pressurized area, so the life is long. Because the sensor is absolute type, Zero-point setting and Zeropoint correction are not necessary. Output signal complying to voltage and current is analog, so the piston position can be easily detected. The output signal can be indicated in a digital counter and the signal data fetched to personal computers can be utilized to high level control system. A high level control is achieved by using the sensor in combination with a pressure transducer. It is possible to measure fuel discharge amount in detail. A sensor can be applied to all piston type accumulator (Ref. P20).

Example 1

Example 2 Power source

Power source

Controller ACC

Voltmeter or Ammeter

Controller ACC

In case of  analog output A/D converter

Digital counter, personal computer, etc.

In case of digital output

2 1 ●

HYB Series

N2 ɡas booster

 N2 gas booster has high energy saving effect. Our piston type accumulators that have a long application history and high reliability that we are proud of are being installed in it as an compressor.

■ Features : ◦ Compact portable type ◦ Low noise ◦ Small power consumption ◦ Cooling water is not required. ◦ Easy maintenance with simple structure ◦ Less expensive than conventional compressors

Circuit diagram

N2

22

HYB Series

N2 ɡas booster

ES Type

■ Model symbols : HYB 10 − ES 2 − 24 − 7.5 × 220V Power source voltage ( ※ Please offer this infomation in advance.) Electric motor output (kW) Maximum N2 gas generating pressure (MPa) (Max W.P of Hyd. pump Minus 1.5) Design number Type  ES:Electrical control type Booster (Compressor) volume (ℓ) Hydraulically driven booster unit Reference information from proven specification (Standard model) Specification

Motor output/cycle Max generated gas pressure Booster Unit Dimensions Mass Max working pressure Hydraulic Delivery Pump Revolution Type Compressor Volume

Model kW/Hz MPa mm kg MPa ℓ/min rev./min ℓ

ES 7.5/60 (7.5/50) 24 750 × 1160 × 1590 600 25.5 10.6 1800 (1500) Piston type 10

Note: This product is not suitable for long time continuous operation because this is for charging N2 gas into our standard accumulator. If you intend to use this product in other purpose than the above, please let us know before you order.

23

FHN Series

Accumulator Stop Valve

 Ever since we started to distribute FHN series as accumulator stop valve in 1985, this product is well-known for many achievements and the reliability.

■ Features : ◦ Compact design with small number of components. ◦ Directly connecting to an accumulator is possible. ◦ Balance structure and a bearing make operation to open and shut easy even at high pressure. ◦ It can be used both as a stop valve and a throttle valve. ◦ Chattering will not occur because the main valve is being screwed to the valve rod. ◦ By using an accumulator joint, the bladder can be replaced without removing an accumulator from the system. ◦ Stainless steel (SUS304) type can be provided.

FHN32S & FHN65S

Model

FHN32L

Dimension d A B C D E F G H I J K L M N P Q R Applicable (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) (㎜) accumulator

FHN32S FHN65S FHN32L

Remarks

Connect to OPF-E-40 Connect to φ56 320 200 120 153 80 114 − 210 − 48 98 38 G¼ 88 110 M24 122.0 OPF-H HF&40〜 Connect to 230ℓ φ30 217 111 106 104 52 77 104 154 50 48 70 18 G¼ 88 − − 55.5 accumulator directly

Max W.P. (MPa)

φ30 217 111 106 104 52 77 − 155 − 48 70 18 G¼ 88 75 M16 55.5 10〜60ℓ

34.4

※OPF-E and OPF-H are special type flange. ※If FHN65S is applied to accumulators with 10 to 60ℓ capacity, it is connected to OPF-E-40 by using a spacer additionally. ※When the accumulator is connected to a drain port, two kinds of joint of a bite type joint and a weld type joint are our standard selection (Ref. pictures at right side). Please specify either of them as you place an order.

Bite type fitting (K)

24

Weld type fitting (W)

FHN Series

Accumulator Stop Valve Circuit diagram : ACC

To drain port (G1/4) To main port

■ Model symbols FHN 32 S − 20 − N − F1-1/4B − K − S7 Mark for NAS cleanliness class. If standard (not required the class), no mark. Connection parts to a drain port N : No mark (prepared by customer) K : Bite type pipe joint W : Weld type pipe joint Connection parts to a main pipe N : No mark (connecting to a inline block arranged separately) F1-1/4B : Weld type mating flange (Connection size shall be written after“F”.) Connection parts to an accumulator N : No mark ◦ In case where FHN32L is applied. ◦ In case where a mating flange (standard) or an accumulator joint is applied. Seal parts material 20 : NBR

※T he standard connecting way is to use a

28 : FKM

mating flange.

Connection measure

However this time, we would like to show

S : Connecting to a flange

the way to connect an inline block by using

L : Connecting directly to an accumulator

below picture.

The port size of the stop valve Accumulator stop valve

Example of use:

Connection by OPF

Direct Connection to accumulator

Connection by an accumulator joint

25

Hiɡh Pressure Gas Cylinder  We design and manufacture high pressure gas cylinders by taking advantage of the proven know-how that we have cultivated in accumulator manufacturing. Concretely speaking, cylinders we supplied is 1 to 500 liter in capacity and the max pressure is 49MPa. The material of cylinders is not only carbon steel but also stainless steel.  The cylinder has many uses, for example, it has been used successfully as a receiver tank for piston type accumulator or as pressure vessel of various gases. If the cylinder is used as a receiver tank, it is possible to provide the unit composed by a piston type accumulator and the cylinder.  The cylinder complying with the Designated Equipment Inspection Regulation of High Pressure Gas Safety Act can be supplied. And it is also possible to provide cylinders designed by ASME or by various classification survey.

Note: 1. The high pressure gas cylinder is different from the vessel under the Cylinder Safety Regulations of High Pressure Gas Safety Act. 2. This product is completely made-to-order, so it is possible to design it as customer demand.

26

NAKAMURA KOKI REQUEST FORM for selecting accumulator

Date:

Your company name Tel E-mail

Contact person System name・Installation position Intended use of accumulators

A. Energy Storage

B. Pulsation Damping C. Surge Absorption

□ Bladder Type

A rubber bag is used to separate N2 gas from liquid. It is used to variety applications such as energy storage by accumulating and discharging energy, pipe pulsation absorption, surge absorption and etc. Our accumulators, not only bladder type but also piston type, are of help in energy saving and improving equipments.

□ Piston Type

A piston is installed to separate the pressurized liquid and the gases. This accumulator is reliable without sudden accidents such as the bladder damage. The especial difference to the bladder type is that a super large capacity model and ultra-large flow model can be manufactured in this piston type.

Type of Accumulators

D. Other

Please fill out 1 ~ 4 for the accumulator selection. 1. Inspection, Standard, etc. 2. Operating Condition □ Unnecessary (Nakamura Koki internal standards)

3. The Bladder Material MPa

Normal Working Pressure

Material

Used Fluid

Temperature range

□ High Pressure Gas Safety Act in Japan

Design Temperature

□ 10(NBR)Nitrile rubber

For low temperature

-25 ~ +  80℃

Normal Working Temperature

□ 20(NBR)Nitrile rubber

Mineral oil, Water glycol

-10 ~ +  80℃

□ ASME

Working Temperature Range

~    ℃

□ 30(CHC)Epichlorohydrin

Gasoline・Aromatic material

-10 ~ +  90℃

□ China standard

Working Fluid

□ 40(IIR)Butyl rubber

Phosphate ester

-10 ~ +  90℃

□ CE-MARK

Installation Site

□ Indoor

□ Outdoor

□ 28(FKM)Fluorine rubber

Chemical material, etc

-  5 ~ +120℃

□ Others(

) Installation Direction

□ Vertical

□ Horizontal

※ If the material of rubber is unknown, please let us know the working fluid and the working temperature range.

4. Specification(a ~ e) a. Connecting parts in the oil side

b. Parts/device in the gas side

c. Safety device

e. Paint

□ Bushing Connection threaded port size [

□ Coreless type gas valve (Nakamura Koki Standard)

□ Melting Plug (Nakamura Koki Standard)

□ Unnecessary(Parkerizing)

□ Rupture Disk Type

□ Nakamura Koki Standard Undercoating:Synthetic resin Final coating:Phthalic acid resin Paint color:Munsell N7 (JPMA color codes N-70)

]

□ Oilport flange model name(Ref. P16) ] [ Mating Flange [ applied・not-applied ] □ Oilport Flange’s Standard and the size ] [ □ Without connection parts □ Others [

]

□ Core type gas valve □ Coreless Type Gas Port Pressure Gage Unit [

□ Special [ ]

]

d. Name Plate

□ N a k a m u r a K o k i S t a n d a r d Name Plate □ Flange(Standard name・size) [ ] □ Specified Name Plate (Please attach specifications)

□ Special (Please attach specifications)

※ Other special specifications :

Please select the intended use of accumulators from A ~ D and fill in the blanks. A. Energy Storage Available Discharge Volume of Acc.

B. Pulsation Dampening ΔV

□ Plunger

ℓ Pump Type

Max Working Pressure

P3

MPa

Min Working Pressure

P2

MPa

Average Working Pressure

Precharge Pressure

P1

MPa

Setting Pulsation Rate

Discharge Time

Tn

sec

Charge Time

Tm

sec

Required Discharge Flow.

Q

ℓ/min

C. Surge Absorption

□ Diaphragm □ vane

[ ]cylinder □ Single acting □ Double acting

□ gear

Px –

Normal Working Pressure

PA

MPa

Max Allowable Pressure

PB

MPa

Precharge Pressure

P1

MPa

Fluid Density

ρ

kg/m³

MPa

Inside Diameter of Pipe

d

mm

Length of Pipe

L

m

Flow Rate of Fluid

Q

ℓ/min

□ MPa %

Max Allowable Pressure

Pm

Precharge Pressure

P1

MPa

Pump Delivery

Q

ℓ/min

Revolution of Pump

N

rpm

※ D.Other

※ CAD data and the capacity calculation program, you can be downloaded from our web site. Our entry column

Recommended Model

Notices

Sales office・the person in charge

Selection Date

27

NAKAMURA KOKI CALCULATION FORM for energy storage

Date:

System Name・Use Place ◎ Please use the absolute pressure in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ). Available Discharge Volume of Acc.

ΔV

ℓ The discharge in the pressure change from P3 to P2.

Max Working Pressure

P3

MPaA The maximum pressure when the fluid accumulates

Min Working Pressure

P2

MPaA The minimum pressure when the fluid discharges

Precharge Pressure

P1

MPaA ①

Average Working Pressure

Px

MPaA ( P3 + P2 )/ 2

Discharge Time

Tn

sec Time to discharge the fluid by Δ V liter from the accumulator

Charge Time

Tm

sec Time to accumulate the fluid by Δ V liter to the accumulator

Polytropic Exponents at Discharge Time

n

Polytropic Exponents at Charge Time

m

Accumulator Gas Volume

V1

① Calculation for determining the precharge pressure value

② ℓ ③ b. W hen there is temperature change, the below formula is applied.

a. P1 = 0.9 × P2( Min working pressure)

    273+Mi n temprature (℃) working pressure) 2 P1 =               ×0.9 × P(Min     273+Max temprature(℃)

※ Please apply the value of a or b.

The precharge pressure range : 0.25 × P3 ≦ P1 ≦ 0.9 × P2 ◎ If the precharge pressure is higher than the value calculated at the above, accumulator capacity becomes smaller but it is not recommended because the life span of the bladder becomes shorter. ② Polytropic Exponents

Check the discharge time(Tn), the charge time(Tm)and the average working pressure(Px)and confirm the polytropic exponent at discharge time(n)from the graph shown in page 3. The polytropic exponent for charge time (m)is n- 0.2. ( To compensate the shortage of gas volume(V1),the value of m is 0.2 less than the value of n.) Ex. P2 = 16.1MPaA P3 = 21.6MPaA Average working pressure=18.85MPaA If Tn is 1.5sec, “n” is confirmed as 1.85 by the graph shown in page 3. If Tm is 120sec, “m” is confirmed as 1.48-0.2=1.28 by the graph shown in page 3. ※ In the case of isothermal change, n = m = 1. ※ In the case of n < m, make the value of "n" same as "m". ※ If the value of m is unclear because the change time is not fixed, we recommend to make the value of m as one (1) to put flexibility into the capacity. ③ Accumulator Gas Volume Calculation Formula V1= ΔV×P2× P3 P2 1 m ( ) 1 n -1 ( ) {   } P P1× P3 2 =    ℓ× MPaA { MPaA × MPaA × ( MPaA MPaA ( 1/ ) MPaA 1/ ) ℓ = -1 } ※ A distinctive idea such as “Gross efficiency of accumurator” defined in other maker’s own right is not included in our calculation formula. Calculation Example Assume that we select accumulator being installed in hydraulic pressure pipe line as energy storage. By using the following calculation, we confirm the accumulator gas capacity and confirm the max allowable discharge flow. The detailed specification is shown in the below table. Conditions Precedent: Discharge time = 1.5 sec, Charge time = 120 sec, Ambient Temperature = 26 ℃, Temperature during operation = 50 ℃ Available Discharge Volume of Acc. ΔV Max Working Pressure P3 Min Working Pressure P2 Preharge Pressure P1 Polytropic Exponents at for discharge n time Polytropic Exponents at charge time m ※ Refer to the polytropic exponents in ② Ex. 3.7ℓ 21.6 MPaA 16.1 MPaA 13.4 MPaA 1.85 1.28 Precharge pressure(P1):     273 + 26 P1 =——————× 0.9 × 16.1 = 13.4MPaA     273 + 50 Accumulator gas volume(V1): V1 = ΔV×P2× P3 P2 1 m ( ) 1 n 21.6 = -1 ( ) {   } P P1× P3 2 3.7 × 16.1 ×( 16.1 { 13.4 × ( 21.6 16.1 1/1.28 ) 1/1.85 ) -1 =32.5ℓ } Confirmation of maximum allowable discharge Flow(Qmax) Qmax= 3.7ℓ×60 ΔV×60 = = 148ℓ/min Tn 1.5sec       From the above calculation, the required accumulator’s function is that the accumulator gas volume(V1)is 32.5ℓ or more and the maximum allowable discharge flow is 148 ℓ/min.  In the case, the recommended accumulator model is G/T230-30. Please select the accumulator model from this catalogue in consideration of the maximum working pressure(P3), the accumulator gas volume(V1)and the maximum allowable discharge flow(Qmax) 28 NAKAMURA KOKI CALCULATION FORM for pulsation damping Date: System Name・Use Place ◎ Please use the absolute pressure in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ) Pump Type Average Working Pressure (   )cylinder [ Single acting・Double acting ] Px F1:Pump Coefficient MPaA Average pressure of the liquid Max Allowable Pressure Pm MPaA Maximum pressure of the liquid Precharge Pressure P1 MPaA ① Pump Delivery Q ℓ/min – Revolution of Pump N rpm – Pump Type Simplex Duplex Pump Delivery per Revolution q Polytropic Exponent n ② Pump Coefficient F1 From table shown on the right hand Accumulator Gas Volume V1 ① Calculation for determining the precharge pressure value ℓ/rev q = Q(Pump delivery )/ N(Revolution of pump ) Quintuple a. P1 = 0.6 × Px(Average working pressure) 0.60 Double acting 0.25 Single acting 0.25 Double acting 0.15 Single acting 0.13 Double acting 0.06 Single acting 0.10 Double acting 0.06 Single acting 0.06 Double acting 0.02 b. When there is temperature change, the below formula is applied.     273+Min temprature(℃) P1 =               ×0.6 × Px(Average working pressure)     273+Max temprature(℃) Check the average working pressure(Px)and confirm the polytropic exponent from the graph shown in page 3. Please contact our sales office if you have any questions. ③ Gas Volume Calculation Formula of the Accumulator Quadruplex ℓ ③ ※ Please apply the value of a or b. ② Polytropic Exponents Triplex F1 Single acting V1= Px ℓ/min 1  rpm ( ) P q×F1× Px 1 n ( ) P 1- m = ×    1- ( MPaA ×( MPaA MPaA ) 1/ ℓ = ) MPaA ※ A distinctive idea such as “Gross efficiency of accumurator” defined in other maker’s own right is not included in our calculation formula. Calculation Example Assume that we control the pump pulsation within 3% of the average working pressure. By using the following calculation, we confirm the accumulator gas capacity. The detailed specification is shown in the below table. Pump type:Plunger Pump Simplex Single acting Average Working Pressure Px 5.1  MPaA Max Allowable Pressure Pm 5.25 MPaA Precharge Pressure P1 3.1  MPaA Pump Delivery Q 32 ℓ/min Revolution of Pump N 62 rpm 0.60 Pump Coefficient F1 Polytropic Exponent n 1.51 Accumulator gas volume(V1) V1= Px ( ) P q×F1× 1 Px Pm 1 n ( ) 1- = 5.1 32 × 0.60 ×( 3.1 62 5.1 1/1.51 1- ( 5.25 ) ) = 26.8ℓ From the above calculation, the accumulator gas volume(V1) of 26.8ℓ or more is required to control the pressure within 3% of the average working pressure.(In the practical aspect, ※ P olytropic exponent at the average working because the flow velocity and the length of the connecting pipe pressure 5.1MPaA is determined from the table is involved, it becomes a target value.) In the case, the recommended accumulator model is G/T175-30. in page 3. As to the effects of pulsation dampener, please refer the sample in page 7. Please select the accumulator model from this catalogue in consideration of the maximum working pressure(Pm)and the accumulator gas volume(V1). 29 NAKAMURA KOKI CALCULATION FORM for surge absorption Date: System Name・Use Place ◎ Please use the absolute pressure in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ). Normal Working Pressure PA MPaA Pressure in the pipe where the surge pressure has not been generated. Max Allowable Pressure PB MPaA Maximum allowable surge pressure Precharge Pressure P1 MPaA ① Inside Diameter of Pipe d mm Length of Pipe L m Fluid Density ρ kg/m³ Mass of Fluid in Line M Flow Rate of Fluid Q Flow Velocity ν m/sec ④ Polytropic Exponent n ② Accumulator Gas Volume V1 ℓ ⑤ ① Calculation for determining the precharge pressure value Petroleum-based hydraulic oil ≒ 900 kg/m³ Phosphoric acid ester-based hydraulic oil ≒ 1100 kg/m³ Water ≒ 1000 kg/m³ kg ③ ℓ/min b. When there is temperature change, the below formula is applied a. P1 = 0.9 × PA     273+Min temprature(℃) P1 =               ×0.9 × PA     273+Max temprature(℃) ※ Please apply the value of a or b. ② Polytropic Exponent Check the normal working pressure(PA)and confirm the polytropic exponent from the graph shown in page 3. Please contact our sales office if you have any questions. ③ Mass of Fluid in Line(M) Calculation formula π π -3 2 M = ×d2×L×ρ= ×( Inside diameter ×10 )× Length × Fluid density = 4 4 ④ Flow Velocity(ν)Calculation formula ⑤ Accumulator Gas Volume Calculation Formula Flow rate      Q m/sec υ= 21.23 ×  = 21.23 ×       = 2 2 Inside Diameter      d V1 = M × v 2 ×(n-1) n-1 B n =    × kg 2 m/sec ×(   -1)    -1 ×( ( ) {    } 2000 ×        { P 2000×P1× P kg MPaA MPaA A MPaA □-1 □ ) ℓ = } -1 ※ A distinctive idea such as “Gross efficiency of accumurator” defined in other maker’s own right is not included in our calculation formula. Calculation Example Assume that we reduce the surge pressure caused by sudden close of the valve that installed at the end of a pipe. The detailed specification is shown in the below table. Condition Precedent: External diameter = 8 B × Sch 40 (JIS: 216.3 mm × Thickness 8.2 mm) Normal Working Pressure Max. Allowable Pressure Prechargie Pressure Inside Diameter of Pipe Length of Pipe Fluid Density Mass of Fluid in Line Flow Rate Flow Velocity Polytropic Exponent PA PB P1 d L ρ M Q ν n 0.85 MPaA 1.35 MPaA 0.75 MPaA 199.9 mm 700 m 900 Kg/m3 19772 kg 4500 ℓ/min 2.4 m/sec 1.407 Mass of Fluid in Line π π -3 2 2 M= ×d ×L×ρ= × (199.9×10 )×700×900=19772 kg 4 4 Flow Velocity Q 4500 v =21.23 ×   2.4m/sec 2 = 21.23 ×    = d 199.92 Gas volume V1= M × v 2 ×(n-1) n-1 B n 2 = 19722 × 2.4 ×(1.407 -1) 1.35 -1 ( ) {    }2000×0.75× P {( 0.85 ) 2000×P1× P A 1.407-1 1.407 -1 = 216ℓ } ※ Polytropic exponent at the average working From the above calculation, the accumulator gas volume(V1)is pressure 1.1MPaA is determined from the 216ℓ or more is required. table in page 3. In the case, the recommended accumulator model is TL175-230″. Please select the accumulator model from this catalogue in consideration of the maximum working pressure(PB)and the accumulator gas volume(V1). 30 Title:中村工機-P31.ec6 Page:19 Date: 2014/12/15 Mon 09:30:00 Safety Precautions for Accumulators     The accumulator is a pressure vessel containing pressurized fluid in it. Read the operation manual and well understand its content before using the vessel. To prevent injury to persons or damage to the accumulator, observe the safety precautions below. 1. Selecting an accumulator !CAUTION : Accumulators are pressure vessels which are controlled under laws and regulations according to their place of use, pressure,   and capacity. When selecting an accumulator, be aware of such regulations. !CAUTION : Select an accumulator which is compatible with its usage conditions, such as operating pressure, amount of work oil to be   pressurized, operating temperature, type of fluid to be charged in the accumulator, environmental considerations, and applicable regulations. If a wrong accumulator were selected, it could not only fail to perform to expectations but also adversely affect interconnected machines. 2. Installing an accumulator !WARNING*: Do not attempt to weld any thing to or drill a hole in an accumulator. Such an act would jeopardize its safety and could cause   it to explode. !CAUTION : Secure an accumulator to the frame or wall with a band or other suitable means. If such a support were neglected, vibration   (due to normal operation or earthquake) would excessively stress the accumulator, and could eventually loosen its fasteners. !CAUTION : Do not subject an accumulator to external heat.           Put up a heat shield around the accumulator if it is near a heat source or exposed to direct sunlight. If an accumulator were heated from outside, the fluid inside could build up a dangerously high pressure. !CAUTION : As a safety measure, provide a pressure control valve in the piping system at a location near and directly connected to the   accumulator so that its maximum allowable pressure will never be exceeded. 3. Charging an accumulator with nitrogen gas (precharging) !WARNING*: Only use nitrogen gas as the fluid precharged in an accumulator. Never use oxygen or flammable gas because it could   cause a fire or explosion. !CAUTION : While no regulatory qualification is required (in Japan) for a person to charge an accumulator with nitrogen gas, it is   important for personal safety that the person be trained for handling high-pressure gases. When charging an accumulator with nitrogen gas, use a charging assembly which is compatible with the accumulator. 4. Using a charging assembly !CAUTION : A charging assembly is used for precharging, replenishing, or pressure calibration. Attach a charging assembly to an   accumulator only before use, and always remove it from the accumulator after use. A charging assembly as permanently attached to an accumulator could increase the possibility of gas leak or damage to its instruments. 5. Using an accumulator !WARNING : Ensure that an accumulator is used at pressures not exceeding its maximum working pressure (design pressure). Excessive   pressure could cause the accumulator to explode. !CAUTION : Do not leave an accumulator charged only with pressurized fluid but not with work oil for more than two weeks. Otherwise,   the bladder rubber could permanently stick to the inside surface of the shell. 6. Maintaining an accumulator !CAUTION : To ensure maximum performance of an accumulator and the integrity of its bladder, check and adjust an accumulator right   after precharging, one week after the precharging, and every three months thereafter. When measuring the pressure of the fluid in an accumulator, the pressure inside the work oil circuit must be equal to the pressure of the outside atmosphere. 7. Disassembling, reassembling, or discarding an accumulator !WARNING*: Reduce the pressure inside the work oil circuit to the pressure of the atmosphere and completely discharge the fluid from   the accumulator before attempting to disassemble it. If you attempted to disassemble it with some pressure inside, you could be injured by the pressure. !WARNING*: Before discharging the fluid from an accumulator, ensure that the area is well ventilated. Otherwise, there could be a   danger of oxygen deficiency. Also ensure that there is no person or objects that could be easily flown away in the direction in which the fluid is to be discharged. Otherwise, the high-pressure jet of the discharged fluid could injure a person or damage objects. !WARNING : After disassembling an accumulator, check and ensure that there is no significantly corroded, scratched, or deformed part in   it before reassembling it. Any degraded part used undetected could endanger the safety of the accumulator. !CAUTION*: If a T-series accumulator is disassembled and its bladder is removed off through the top portion, discharge away any fluid   remaining at the bottom before replacing a new bladder. Otherwise, the new bladder could be deformed and damaged by the buoyancy from the remaining fluid. !CAUTION*: When discarding an accumulator, first release both work oil and fluid pressures to the atmosphere, and then disassemble it   and take necessary measures to make it unusable. Note : The WARNING or CAUTION statements with the word WARNING or CAUTION indicated by the asterisk (*) above are also marked on an accumulator in the form of a label. ³ Title:表4のみ.ec6 Page:1 Date: 2014/12/19 Fri 14:12:08 Ever since our company started to deliver bladder type accumulators in 1962, we do continuously achieve customer satisfaction by supplying the unique products in high quality and special technic. If you have any questions or if we can be of help in any way, please don’t hesitate to let us know. We are looking forward to do business with you in near future! 〈PRODUCT LINE〉 Bladder type accumulators Piston type accumulators Diaphram type accumulators Accumulator stop valve Hydro-Lung N2 gas boosters for charging gas Accumulators with sensors In-line type accumulators O-rings and special packings (NOTE: There is a possibilly that the contents of this brochure is changed without notice.) HANGZHOU NAKAMURA KOKI HYDRO TECHNICA CO., LTD. The factory is approved by CE, AQSIQ (China), METI (Japan), and certified by ASME (USA), ISO 9001 (Headquarter factory・accumulater) Headquarter   18-43 Heizaemoncho, Amagasaki-shi, Hyogo-ken 660-0087, Japan factory     Tel:81-6-6419-3791         FAX:81-6-6419-3795         E-Mail : 14.08A 1000 title : 表紙.ec6 Page:1 Date : 2014/12/15 Mon 09:38:19HYDROPNEUMATIC ACCUMULATORS2014Courtesy of JAXATitle : 中村工機-P02∼08.ec6 Page:2 Date : 2014/12/15 Mon 09:14:44Functions & Effects ■ Energy Storage ( power compensation ) This is the most coarse use of the collector to store energy from an external press beginning during idle time and to discharge the energy as necessary. concretely speaking, it is used to make pump/motor size small and besides used as an aide exponent source in emergency, as a hydraulic starter for an inner combustion locomotive and as aid for pump delivery at the time of high-speed activation of an actuator, etc.■ Shock absorption of Water fastball and Surge atmospheric pressure suddenly shutting off a hard-hitting and high-flow pipeline generates large impact pressure. In other cases mechanical shock to an actuator from external may cause fluid vibration and frankincense damage to equipment. The collector mitigates these shocks.■ Pump pulsation damping Pulse imperativeness in a single, dual or treble piston pump for high atmospheric pressure operation makes control condition of a pressure device difficult. however, by using the collector, not only the worry due to pulse pressure but besides the bump phenomenon due to smallness feeding from a cylinder of a machine instrument etc. can be solved.■ Leak compensation The storage battery compensates for the press drop caused by a escape that may occur by keeping an actuator at a situate position for a long time or by clamping something.The hydro-pneumatic storage battery is a storage vessel for pressurize fluid that utilizes compressed gasoline. Energy from compressed gas makes pressured fluid empty from the vessel. The bladder type collector has a delicate rubber bag, that separates compressed gasoline and non-compressed fluid, and flatulence is charged into the udder. One of large characteristics of the bladder type storage battery is to have many early functions than energy repositing. ■ compensation in temperature deepen The storage battery reduces the pressure upgrade in close pipe-lines under the burn sun and compensates for the imperativeness drop curtain caused by fluent contraction in cold area.■ Hydraulic reconciliation By using the boast coerce in the collector as a weight, cylinder clash leads vertical movement of a machine joyride head or a television receiver camera.■ Hydro-pneumatic jolt assimilation The collector serves as a spring for absorbing shock between the body and wheels of a vehicle. In addition, it can be utilized as a pneumatic give for versatile compress rolls. The collector provides lessfatigue and high preoccupation efficiency of impact energy as compared to a spring.■ Transfer barrier This is the method to transfer the hydraulic pressure from one english to the early without mixing each fluent. In this method, the accumulator serves as a accelerator compressor or transfers corrosive fluid. In ordering to reduce the accumulator press change caused by charging or discharging fluids, the storage battery can besides be operated with depleted derived function pressure by increasing its accelerator chamber volume.■ Fluid supply The accumulator is used for supplying lubrication petroleum in emergency or used as a portable vegetable oil lubricator.2 ●Title : 中村工機-P02∼08.ec6 Page:3 Date : 2014/12/15 Mon 09:14:46SYMBOLCOMMONAccumulator volume Calculation△ V : available Discharge volume of Acc. ( ) P1 : Precharge Pressure ( MPa・A ) P2 : Min Working Pressure ( MPa・A ) P3 : Max Working Pressure ( MPa・A ) n : Polytropic Exponent at Discharge time ( Per Graph Below ) megabyte : Polytropic Exponent at Charge time ( m=n-0.2 ) V1 : Accumulator Gas volume ( ) Energy StorageFORMULACALCULATIONSurge AbsorptionP ( P ) V= P − 1 P ( ) P P − 1 P × V (P ) △ V= P P (P ) 3△ V × P2× 3Pulsation Dampening1 m1 n1 nPA : Nomal Working pressure ( MPa・A ) PX : average running pressure ( MPa・A ) PB Max Allowable Pressure ( MPa・A ) Pm M : mass of Fluid in Line ( ㎏ ) υ : flow Velocity ( m/sec ) q : pump Delivery per a Revolution ( /rev ) F1 : Pump Coefficient ( See the graph below. ) M ×υ2× ( newton − 1 ) V1= P B n−n 1 2000×P1× − 1 P AV1=( )( ) 1− P (P )Pχ q × F1 P1 1 χ normality mPump Type Simplex Duplex TriplexF1 : Pump Coefficient1 mNote : P1=0.6P XQuadruplexNote : note : Assuming the discharge/charge time as “ 1 or less ”, “ newton ” is Quintuple In isothermal switch, n=m=1. found from the average pressure value in the graph below.F1single acting double acting single acting doubling acting single acting duplicate acting single acting double acting unmarried acting double acting0.6 0.25 0.25 0.15 0.13 0.06 0.10 0.06 0.06 0.02LIMIT ( 1 ) The magnitude relationship of pressure should be 0.25 × ( P3 or PB or Pm ) ≦ P ≦ 0.9 × ( P2 or PA or PX ). ( 2 ) In case of n < meter in energy memory, make the value of “ newton ” as “ thousand ” ( but it should be over 1 ) Polytropic Change & Exponent Graph ( Check the advocate measure from the discharge/charge time and the average pressure rate. ) 302.4 ( 2.2 ) 2.3 ( 2.1 ) 2.2 ( 2.0 ) 2.1 ( 1.9 ) 252.0 ( 1.8 ) 1.9 ( 1.7 ) 1.8 ( 1.6 ) 151.7 ( 1.5 ) 101.6 ( 1.4 ) 1.5 ( 1.3 ) 1or less1.4 ( 1.2 ) 1.3 ( 1.1 ) Polytropic exponent normality, m →P2+P3 average imperativeness ( MPa・A ) → 2201.21.1 ( 1.0 ) 1or less6 7 8 9102030405060708090 100200Discharge time, Charge time ( securities and exchange commission ) →300 400500600800 700 90010001.0 2000 3000 4000Discharge clock ( P3 → P2 ) charge time ( P2 → P3 ) ↑ ↑ n ( m ) example : 1. On the assumption that the dismissal time is 5sec and the average pressure is 5MPa, the polytropic exponent is 1.41. 2. On the assumption that the charge time is 5sec and the average pressure is 5MPa, the polytropic exponent is 1.21. note : consult to the above break lines.3 ●Title : 中村工機-P02∼08.ec6 Page:4 Date : 2014/12/17 Wed 17:53:10Exercise 1, Energy storage : Operate a 500kN press car, that aries diameter is φ200mm. The stroke is 115mm, the influence time is 1.5sec and the idle time for removing the sour is 2min. On the premise of the above, we compare two cases, Case 1 is to use a pump and a drive only and Case 2 is to add an collector to them. How will the size change ? The answer is shown in table 1. < Case 1 : pump and Motor lone > << Case 1 : calculation >> 500 × 103N Ram defense intelligence agency. 200mm, Required pressure= =15.92 ≒16MPa ( Ram area=202 × 0.785=314 ) 314 × 102 Fluid required for 1 stroke=314 × 11.5㎝=3,611cc=3.7 3.7 Fluid volume required in a second= =2.47/sec 1.5 second Flow volume required in a minute=2.47 × 60=148.2/min ≒ 149/min 149 /min × 16 MPaG 39.0 Motor= ≒ ≒ 47.6 kW ≒ 55 kilowatt 61.2 × η ρ ( Pump Efficiency ) 0.82 << Case 1 : consequence >> The command fluid book of the pump = 149/min, The necessitate pressure = 16MPa or more, Motor capacity = 55kW< Case 2 : pump, Motor and Accumulator > If an collector is added to the system, there are two approaches ( Formula : crush power=Pressure × Ram dimension ). One method acting is to adopt the press cylinder with a larger bore in consideration of the imperativeness dribble ( P3 → P2 ) during fluid discharge ( in character of the bladder type storage battery ). Another method acting is to design the storage battery ‘s soap working press such that its minimal blackmail of the accumulator becomes to 16MPaG at the end of dismissal ( in this case, the soap imperativeness is designed as 21.5MPaG ). Let us work on the latter case. In this case, the storage battery with the soap imperativeness of 21.5MPaG and the pump with 21.5MPaG world power are used together. The calculation for pump and motor size is as follows, << Case 2 : calculation >> △ V × P2 ( P3/P2 ) 1/m table 1 : Comparison board of Case 1 and Case 2 V1= P1 (P3/P2)1/n − 1 Case 1 Case 2 Notes : ◎ On the pressure, convert ( MPaG+0.1 ) into MPaA Required pressure 16MPaG 21.5MPaG ◎ Refer to following item f as to P1 Pump 149/min 1.9/min 3.7 × 16.1 ( 21.6/16.1 ) 1/1.28 =32.5 ≒ 33 V1= 1/1.85 Motor 55kW 1.1kW 13.4 (21.6/16.1) − 1 Accumulator none 33 3.7 run rate to accumulator= =1.9/min 2min 1.9 /min × 21.5 MPaG ≒ 1.1kW Motor= =0.82kW 61.2 × 0.82 << Case2 : consequence >> The needed coerce : 1.35 times bigger than Case1, The pump bulk : 1/79 size of Case 1, The drive size : 1/50 size of Case 1. < The sample procedure to select the storage battery model for drill 1 > a. As the want press is 21.5MPaG, the exemplar shall be G230 or T230 ( Ref. pages 8 and 9 ). bacillus. As the count accelerator bulk is 33, the nominal natural gas volume is 30 ( Ref. pages 8 and 9 ). c. As the needed fluid volume is 149/min, it is within the range of the soap allowable discharge stream shown in the G/T series ( Ref. pages 8 and 9 ). d. If the fluid is mineral oil/water-glycol and the work temperature is under 80℃, the bladder substantial is NBR # 20 ( Ref. page 6 ). e. If a flange is used for piping, the oilport flange ‘s type is OPE-D32 with a copulate flange ( Ref. page 16 ). As a leave of the above ( a. ∼ e. ), the accumulator model shall be “ G/T230-30-20-OPF-D32 with a copulate flange ”. f. Confirmation of the Precharge pressure ( P1 ) As the basic information, the higher the pre-charge imperativeness ( P1 ) is, the bigger △ V increases. At the same time, P1 should be within the range of P1 < 0.9 × P2. Taking into consideration the character that the fluid temperature may increase during operation, P1 shall be designed as systematically less than 90 % of P2. If P1 becomes higher than P2, the bladder life will be abruptly. absolute temperature at precharging P1= × 0.9 × P2 273+26 = × 0.9 × 16.1=13.4 MPaA ~ Max absolute temperature 273+50 When the value of P1 is 13.3MPaG, ⊿V shall be 3.7 .4 ●Title : 中村工機-P02∼08.ec6 Page:5 Date : 2014/12/15 Mon 09:14:47Exercise 2, Pulsation Damping : The calculation formula to select the collector model for pulsation dampen is as follows, < Conditions Precedent > Symbol P1 Px Pm N Q F1 q nMeaning Precharge pressure Average work blackmail Max permissible pressure Pump type Revolution of pump Pump manner of speaking Pump coefficient Pump delivery per rotation Polytropic exponentDetails 1 3MPaG 5MPaG Px +3% = 5.15MPaG Simplex & Single acting 62rpm 32/min 0.6 Q/N average coerce = 5.1MPaADetails 2 3.1MPaA 5.1MPaA 5.25MPaA32/62 1.51< Calculation Formula > V1=( ) = 62 × 0.6 ×(3.1)=26.8 5.1 1− P (P ) 1 −(5.25 )Pχ q・F1・ P1321 χ n5.11/1.51< Result > The gasoline volume of the storage battery to control pulsation within ±3 % of the median work pressure is 26.8. For your information, the pump rescue per a rotation can besides be calculated by checking the pump plunger size and its stroke. a. consult to Exercise 1 for accumulator model choice. b. Refer to page 7 for the effects of pulsation damping.Exercise 3, Surge Pressure Absorption : The calculation to get the necessitate natural gas volume of the collector for rush blackmail assimilation is as follows, ( Purpose & Situation : Absorbing the tide coerce due to sudden close of the valve in the pipe end. ) < Conditions Precedent > Symbol LMeaning Total duration of oil pipingExternal diameter of pipingd Q PA PB P1 υ north ρInternal diameter of piping Fluid book Normal pipe-line pressure Max permissible atmospheric pressure Precharge Pressure Flow speed Polytropic exponent Fluid specific gravityDetails 1 8B × Sch40 ( JIS : 216.3mm × Thickness 8.2mm ) 216.3mm8.2mm8.2mm 4500/min 0.53MPaG 1.13MPaG P1 ≦ 0.9 × PA = 0.9 × 0.63MPaA 4/ π× Q/d2 = 21.23 × 4500/199.92 average pressure= ( 1.23+0.63 ) /2 ≦ 1 -Details 2 700m 216.3mm 199.9mm 0.63MPaA 1.23MPaA 0.53MPaA 2.4m/sec 1.405 900kg/m3< Calculation Formula > π π M= d2・L・ ρ = × ( 199.9 × 10−3 ) 2× 700 × 900=19772㎏ 4 4 ( M : multitude of fluid in piping line ( kg ) ) M ×υ2× ( newton − 1 ) 19772 × 2.42× ( 1.405-1 ) = P B n1 1.23 0.2883 = 205 n 2000 × 0.53 × 2000×P1× − 1 − 1 P A 0.63 < Result > The needed gas bulk of the collector is 205. V1=( )( )< Note > Please refer exert 1 about the procedure of selecting the accumulator model.5 ●Title : 中村工機-P02∼08.ec6 Page:6 Date : 2014/12/15 Mon 09:14:48Explanation of Model Symbols G □ 350 − 20 H − 20 − OPF − J − 32 − CG 60M − MT − S7Mark for NAS cleanliness classify in a servo circuitry etc. Select the course from 6, 7 or 8. If standard ( not required the class ), no mark. MT…Safety device for gas interface. If not specified, 60M … Glycerol filled blackmail a standard gas gauge for accelerator port. valve will be CG…Coreless type Gas Port provided. ( Ref. page 14 ). A criterion bushing ( Rc connection ) will be Oilport flange model name ( Ref. page 16 ). provided, if not specified. nominal diameter of a copulate flangeRubber materials 10 Nitrile condom ( NBR ) Low Temperature− 25 to+80℃20 Nitrile rubber ( NBR ) Mineral oil, urine glycol− 10 to+80℃30 Epichlorohydrin ( CHC ) Gasoline, and so forth, Aromatic material − 10 to+90℃40 Butyl arctic ( IIR ) Phosphate ester28 Fluorocarbon rubber ( FKM ) Chemical material− 10 to+90℃ − 5 to+120℃Types StandardRef. pages 7, 8, and 9High flow typeHigh flow drop ( Ref pages 8 & 9 ) screen typePoppetless ( Ref. page 11 ) transfer barrier typeTransfer of dissimilar fluid ( Ref. page 12 ) Nominal gas book of the collector ( ) Maximum work pressure ( kgf/ ) Surface discussion and Material Mark Contents Parkerizing WNickel platingStainless steelPTFE coatingFluid type Material For mineral vegetable oil and water ethylene glycol For Water, etc.Shell : Nickel plating connection : stainless steel Shell & Connection : stainless steel Shell inside : PTFE coated joining : stainless steel steelAccumulator Series6 ●Miniorator SeriesSmall volume typeRef. page 7General SeriesStandard typeRef. page 8Twin Open SeriesOpen exceed typeRef. page 9Damper SeriesIn-line typeRef. page 10Title : 中村工機-P02∼08.ec6 Page:7 Date : 2014/12/15 Mon 09:14:49M-Series MINIORATORModelM210Spec.Max. W.P20.6MPaGas typeN2 gasPrecharge press limits Instailation Surface treatmentModel symbols0.25 × P3 < P1 < 0.9 × P2 ( P1=Precharge blackmail, P2=Min working pressure, P3=Max working pressure ) vertically ( Oil side is down ) Fluid = oil : Parkerizing Fluid = Water, etc. : nickel plating note : stainless steel steel type is shown in page 13. 20. ( NBR ) Mineral Oil M 210−1−20 Rubber 40. ( IIR ) Phosphate Ester Materials 28. ( FKM ) Chemical Material Nominal boast book of accumulator ( ) Max working pressure SeriesDimensions Max W.P. Gas volumeMassUD(MPa)(㎏) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) Model M210-0.1 M210-0.3 M210-0.520.6M210-1()E ( millimeter ) Max allowable discharge flow ( /min ) 0.1152.02327460.585Rc1/4620.295.02869476.38535Rc3/4920.56.33769476.38535Rc3/4921.012.5398124107.98510Rc3/4260◎ Maximum allowable discharge flow is designed to avoid the show-stopper ‘s chatter phenomenon due to supercharge fluid. ◎ Maximum allowable discharge flow is designed in the case where the fluid substantial is mineral petroleum VG46.■ Examples in Pulsation damping effects ( A ) Without ACC. ( B ) With ACC.Ex.1 0.5bladder type ACC. ( A ) Without ACC. ( B ) With ACC.Ex.2 0.5bladder character ACC.7 ●Title : 中村工機-P02∼08.ec6 Page:8 Date : 2014/12/15 Mon 09:14:50G-Series GENERAL SERIESSpec.ModelMax. W.P.G175G230G300G35017.2MPa22.6MPa29.5MPa34.4MPaGas typeN2 gasPrecharge 0.25 × P3 < P1 < 0.9 × P2 pressure ( P1=Precharge atmospheric pressure, P2=Min working pressure, P3=Max working pressure ) limits Installation Vertically ( Oil slope is down ) Fluid = oil : Parkerizing Surface Fluid = Water, etc. : nickel plating treatment note : stainless steel type is shown in page 13. 10. ( NBR ) Low Temperature G 230−10 H−20 20. ( NBR ) Mineral Oil Rubber 30. ( CHC ) Aromatic Material Materials 40. ( IIR ) Phosphate Ester 28. ( FKM ) Chemical Material Model Hi-Flow TYPE symbols Nominal flatulence bulk of the accumulator ( ) Max working imperativeness Series Dimensions ModelG175−1 −2.5 −4 −5 −10 −20 −30 −50 −60 G175−10H −20H −30H −50H −60H G230−10 −20 −30 −50 −60 −10H −20H −30H −50H −60H G300−1 −2.5 −4 −5 G350−1 −10 −20 −30 −50 −60 −10H −20H −30H −50H −60HMax W.P. Gas volume Mass (MPa) () (㎏) 1.2 9 2.4 15 3.7 18 4.7 20 12.0 44 20.8 61 37.2 96 17.2 53.1 128 64.7 152 11.3 59 20.1 76 36.5 111 52.4 143 64.0 167 10.6 55 19.0 79 34.0 127 48.5 172 59.4 206 22.6 9.9 70 18.5 94 33.6 142 48.1 187 58.7 221 1.2 10 29.5 2.4 20 3.6 19 29.4 4.6 22 1.2 10 10.1 65 19.0 102 34.2 163 49.3 219 34.4 60.0 262 9.4 80 18.3 117 33.5 178 48.7 234 59.3 277A ( millimeter ) 391 577 474 536 660 933 1444 1952 2318 649 922 1433 1941 2307 662 935 1446 1954 2320 653 926 1437 1945 2311 391 577 458 514 391 647 945 1456 1964 2322 633 931 1442 1950 2308B ( millimeter ) C ( millimeter ) 10764106 89D einsteinium F ( millimeter ) ( millimeter ) 118 Standard unit 120 10 comes with a 168.3 bushing Rc3/4 connection. As to a flange 15 connection, refer to page 16. 232 association is flangeMax permissible fire flow ( /min ) OPF-S10814003600 ( Ref. to page 16 ) 101 89232Standard unit comes with a bushing Rc3/4 15 connection. As to a flange association, refer to page 16.1400Connection is flange OPF-S or OPF-J1033600 ( Ref. to page 16 ) 1076410764120 127 177.8 120101 89241.8 103Standard unit of measurement 10 comes with a bushing Rc3/4 connection. As to a flange 15 connection, refer to page 16.3421400Connection is flange OPF-J ( Ref. to page 16 ) ◎Refer to page 16 for flange connection. ◎Maximum permissible dismissal hang is designed in the case where the fluid material is mineral oil VG46.8 ●3423600Title : 中村工機-P09∼17.ec6 Page:9 Date : 2014/12/15 Mon 09:21:29T-Series TWIN OPEN SERIES ■ Features : A boastfully open is provided on the top for still of alimony. Because the bladder is orotund to expand and abridge easily, the excessive distortion tends not to occur and the life couple is farseeing. The bladder soundbox does n’t have a seal structure, so special skill for care is not required. In the way of customer ‘s convenience the bladder can be replaced from both ports in top and bottom. The carapace body has assembly structure without screw clamps, so customer is free from stripped screws disturb in dismantling. ■Model symbols : T 175 − 10 H − 2010. ( NBR ) Low Temperature 20. ( NBR ) Mineral Oil Rubber 30. ( CHC ) Aromatic Material Materials 40. ( IIR ) Phosphate Ester Hi-Flow TYPE 28. ( FKM ) Chemical Material Nominal gas volume of the collector ( ) Max working blackmail SeriesDimensions Model T175−10 −20 −30 −50 −60 −10H −20H −30H −50H −60H T230−10 −20 −30 −50 −60 −10H −20H −30H −50H −60H T350−10 −20 −30 −50 −60 −10H −20H −30H −50H −60H T120−40 −58 −80 −120 −180 T175−40 −58 −80 −120 −170 TL175−170 −230 T230−40 −58 −75 −120 −170 TL230−160 −220 T350−40 −58 −70 −100 −160 TL350−160 −220Max W.P. (MPa)17.222.634.411.817.222.634.4Gas book () 11.6 20.4 36.8 52.7 64.3 10.9 19.7 36.1 52.1 62.6 10.3 18.8 33.8 48.3 59.0 9.6 18.2 33.2 47.7 58.3 9.7 18.6 33.8 48.9 59.6 9.6 17.9 33.1 48.3 58.9 43.0 61.0 79.0 127.0 183.0 41.0 58.0 75.0 120.0 170.0 167.0 222.0 37.0 54.0 70.0 112.0 164.0 157.0 213.0 35.0 51.0 66.0 103.0 155.0 152.0 205.0Mass (㎏) 45 62 97 129 153 60 77 112 144 168 56 80 128 173 207 71 95 143 188 222 67 104 165 221 264 84 119 180 236 279 110 136 162 234 316 155 192 227 323 439 423 549 177 222 270 391 535 531 689 214 267 321 459 636 609 792A ( millimeter ) 673 946 1457 1965 2331 662 935 1446 1954 2320 673 946 1457 1965 2331 664 937 1448 1956 2322 657 955 1466 1974 2332 663 941 1452 1960 2318 918 1144 1364 1968 2666 918 1144 1364 1956 2670 2046 2652 918 1144 1364 1956 2670 2056 2662 918 1144 1364 1950 2700 2056 2662B ( millimeter ) C ( millimeter ) D ( millimeter ) 106E ( millimeter ) 15Standard whole comes with a bush Rc3/4 connection. As to a flange joining, refer to page 16.110Max allowable drop stream ( /min ) 1400Connection is flange 1083600OPF-S ( Ref. to page 16 ) 23210115Standard unit comes with a bushing Rc3/4 association. As to a flange connection, refer to page 16.1400Connection is flange 103OPF-S or OPF-J3600 ( Ref. to page 16 ) 107 10115 241.8Standard unit comes with a bush Rc3/4 association. As to a flange connection, refer to page 16.1400103110108355.6Connection is flange OPF-S ( Ref. to page 16 ) 105103355.6102100406.4105103355.6102100406.43600Connection is flange OPF-S or OPF-J ( Ref. to page 16 ) 105103355.6102100406.4◎ Refer to page 16 for flange connection. ◎ Maximum allowable drop stream is designed in the case where the fluent material is mineral vegetable oil VG46.9 ●Title : 中村工機-P09∼17.ec6 Page:10 Date : 2014/12/15 Mon 09:21:30Damper series ( In-line type ) AccumulatorD-SeriesFlowAcross Flats 55■ Features : ●Because the fluid directly flows along the airfoil of the bladder, the bladder can absorb senior high school frequency pulsations. ●A valid and feasible model for prevention of water hammer, scend press and noise, etc. ●Because the collector is directly installed into pipe-line, customer can save the space and this facilitate refer about contamination due to fluid mansion. ●The bladder body does n’t have a seal structure, so special skill for maintenance is not required. ■Model symbols : D 215 − 02 − 20Rubber 20. ( NBR ) Mineral Oil 40. ( IIR ) Phosphate Ester Materials 28. ( FKM ) Chemical MaterialNominal gas volume of the storage battery ( ) Max working pressure SeriesModelDimensionsD215-02 D215-1.5Max W.P. (MPa)21.0Gas volume ()Mass (㎏)A ( millimeter ) B ( millimeter ) 0.198.0328131Rc 116740A Flange Connection1.233.0400D ( millimeter ) Max allowable stream rate ( /min ) 80140154420◎If flange connection is applied, the placement of the bolt-hole of each flange is unlike in rotation direction. The match flanges and the seal parts will be provided. ■Example in Pulsation damping effects ( A ) Without ACC.1 0 ● ( B ) With ACC.Title : 中村工機-P09∼17.ec6 Page:11 Date : 2014/12/15 Mon 09:21:31P-Type Screen Type Accumulator Screen type can be applied to G series and T series. Screen type has a plate with many small holes to allow fluid to pass through, in stead of a poppet valve placed at the petroleum port. Max allowable precharge blackmail is 0.75MPaG and the bladder of this type is free from damage due to a poppet even if the fluid press will be under the precharge pressure or be like to atmosphere blackmail. This character is widely used for surge pressure damping in a water grapevine at lowpressure use or in pipelines in petrochemical industries, etc.Screen type in General series ■Model symbols : G 30 − 10 P − 20 − For a bushing connection, specify Rc diameter. For a flange association, specify the standard and nominal diameter of it. 10. ( NBR ) Low Temperature Rubber 20. ( NBR ) Mineral Oil 30. ( CHC ) Aromatic Material Materials 40. ( IIR ) Phosphate Ester 28. ( FKM ) Chemical Material P-Screen type Nominal gasoline volume of the accumlator ( ) Max working blackmail ( 3.0 MPa ) Series If the Twin Open Series is required, indicate “ T ” .Dimensions ModelG30−1P −2.5P −4P −5P G30−10P −20P −30P −50P −60P T30−10P −20P −30P −50P −60P T30−80P −120P −180PMax W.P. Gas volume Mass (MPa) () (㎏) 1.2 9 2.4 11 3.7 18 4.7 20 11.3 59 20.1 76 36.5 111 52.4 143 3.0 64.0 167 10.9 60 19.7 77 36.1 112 52.1 144 62.6 168 79.0 162 127.0 234 183.0 316A ( millimeter ) 391 577 474 536 649 922 1433 1941 2307 662 935 1446 1954 2320 1364 1968 2666B ( millimeter ) C ( millimeter ) 10764D ( millimeter ) 118 120.0 168.3E ( millimeter ) Max flow rate ( /min ) Bushing height 10 ( Ref. to page 8 ) Standard unit comes with a bushing Rc3/4 connection. As to a flange connection, refer to page 16.7589 232Connection is OPF-S.108700 ( Ref. page 16 ) 110 355.6◎ Max flow rate is calculated under the position where the blackmail difference between the storage battery and the organ pipe line is 1.18MPa. ◎ Max menstruate rate is designed in the character where the fluid material is mineral anoint VG46 at 28℃.1 1 ●Title : 中村工機-P09∼17.ec6 Page:12 Date : 2014/12/15 Mon 09:21:31Transfer Barrier AccumulatorTypeB-TypeTransfer barrier accumulators are used to transfer blackmail between unlike types of fluid, for example, the imperativeness between vegetable oil and water, clean anoint and contaminated petroleum, liquid and natural gas, etc. A penetrate tube is installed into the bladder to prevent the bladder from wrong due to the fluent ‘s direct contact with the interior of the bladder. concretely speaking, this type accumulator is used to convert oil blackmail to water coerce and/or provide petroleum to a compressor bear, etc. Transfer Barrier Type in T series ■Model symbols : T 175 − 20 B − 20 − For a bushing connection, Rc3/4 is provided as criterion for both flatulence and oil port sides. For a flange connection, specify the standard and the nominal diameter of the flange. 10. ( NBR ) Low Temperature Rubber 20. ( NBR ) Mineral Oil 30. ( CHC ) Aromatic Material Materials 40. ( IIR ) Phosphate Ester 28. ( FKM ) Chemical Material “ B ” means Transfer Barrir Type Nominal gas volume of the collector ( ) Max working press Series If the Gneral Series is required, indicate “ G ” .Dimensions ModelG175−20B −30B −50B −60B T 175−20B −30B −50B −60B T 175−80B −120B −170BMax W.P. Gas bulk Mass (MPa) () (㎏) 20.8 61 37.2 96 53.1 128 64.7 152 20.4 62 17.2 36.8 97 52.7 129 64.3 153 75.0 227 120.0 323 170.0 439A ( millimeter ) 954 1465 1973 2339 951 1462 1970 2336 1374 1966 2680B ( millimeter ) C ( millimeter ) D ( millimeter ) E ( millimeter ) 10623255110 Reference dimension, ASME 150LB 1151B RF 103355.690◎In font where the mineral vegetable oil VG46 flows at 200/min, the pressure loss of the pierced tube shall be about 0.08MPa. ◎The bladder ‘s compression proportion shall be within ( 0.2P3≦P1≦0.9P2 ) or within ( V3≧0.2V1, V2≦0.9V1 ) .12 ●Title : 中村工機-P09∼17.ec6 Page:13 Date : 2014/12/15 Mon 09:21:32Stainless Steel AccumulatorM.G.T. SeriesRecently, collector came to be used for not entirely anoint system but besides water/special melted system being operated by gamey honor washing water, eminent cleanliness chemical fluid, etc. For such applications, a stainless steel storage battery is most appropriate.■ Features : The material is stainless steel steel that has high anti-corrosiveness such as SUS304, SUS316L, etc. Customer can maintain a high cleanliness level in the lubricate system, the hydraulic system, etc. by using this collector. The shell is designed under JISB8358 and is non-weld built-in structure made from seamless tube. titanium ( TB480H ) bladder type accumulators are besides available. The extra exemplary with the soap working atmospheric pressure improving to 34.4MPaG can be supplied. Stainless Steel Type in G Series ■Model symbols : G S 70 − 50 − 20 − For flange connection, specify the standard and the nominal diameter of flange. 10. ( NBR ) Low Temperature Rubber 20. ( NBR ) Mineral Oil 30. ( CHC ) Aromatic Material Materials 40. ( IIR ) Phosphate Ester 28. ( FKM ) Chemical Material Nominal accelerator volume of the accumulator ( ) Max working blackmail “ S ” means Stainless Steel Type Series M − Miniorator Series G − General Series T − Twin Open Series Dimensions ModelMS210−0.1 −0.3 −0.5 −1 GS140−1 −2.5 −4 −5 GS70−10 −20 −30 −50 −60 TS70−10 −20 −30 −50 −60 TSL60−100 −170 −240Max W.P. Gas bulk (MPa) () 0.115 0.29 20.6 0.5 1.0 1.0 2.4 13.8 3.4 4.4 12.0 21.3 7.0 38.7 56.1 67.6 11.5 20.8 7.0 38.2 55.6 67.1 101.0 6.0 167.0 237.0Mass (㎏) 2 5 6.3 10.5 9 12.5 21 24 35 48 76 101 120 37 50 77 103 123 162 240 320A ( millimeter ) 232 286 376 398 391 577 500 558 656 929 1440 1948 2314 665 938 1449 1957 2323 1323 1938 2578B ( millimeter ) 8510789C ( millimeter ) 74D ( millimeter ) 60.5E ( millimeter ) −9476.335115100※ UD Ref. page 710F Rc1/464114.310417715 comes with a bushing Rc3/4106232connection. 15 As to a flangeStandard unitconnection, refer to page 16. 104101232107105406.415 A flange connection is OPF-S ( Ref. page 16 ) .◎The dimensions of E and F written in the above table is our standard size. If other standard such as ASME, API, JPI or DIN or other extra substantial is required, please let us know the specification. ◎Please let us know your coveted permissible menstruation rate.1 3 ●Title : 中村工機-P09∼17.ec6 Page:14 Date : 2014/12/15 Mon 09:21:33Accessories on gas side 1. Coreless type gas interface Pressure gauge Circuit diagramStop valveBleed plugREF. 160Bleed plugGlycerol filled pressure bore Stop valveCoreless valve ( N2 boast suppiy port ) Coreless valveMT or SP TV8 ( 8V1 ) ( N2 gasoline supply port ) condom deviceConnecting to accumulator, 7/8 ” -14UNF set sleep together Accumulator conenecting portREF. 69.5■Model symbols : Max. scale of − atmospheric pressure gaugeG 230 − 50 − 20 − CGSafety unit Coreless character natural gas port ( Approved by the japanese High Pressure Gas Safety Act of METI ) Type CGMax working pressure Pressure trial value 34.4MPaGlycerol fill up pressure gaugeRubber materials Nominal accelerator volume of the collector ( ) Max working pressure Series Note : merely a charging hose assembly is required when the coreless type flatulence port is being installed. In other words, the charging valve assembly is not required when the coreless type gasport is being installed.Standard soap scale value Working presure range 25MPa 0 ∼ 18MPa 40MPa 0 ∼ 25MPa 60MPa 0 ∼ 34.4MPa not required for 10 or more liters accumulator because this is being installed in the bladder assembly. Safety-unit Type MT SP2. Charging forum : Charging Valve ( VR type ) Hose connectionMelting Temperature 105 ± 5℃ Stop plugCaution in the case where the charge pressure is highly low blackmail. When the commit pressure toVR character gas valve is less than 1MPa, there is possibility not to be able to charge flatulence into an collector due to the crack press of the check valve ( core ) of the charging valve. consequently, if the load atmospheric pressure is less than 1MPa, please let us know before you order. The charging valve ( VRZ type ) for extremely abject pressure is recommended. If you have any questions, please feel release to contact us.TV8 ( 8V1 ) Connecting to accumulatorCharging Hose AssemblyChargingMax workingStandardHose Type TS150 TS400pressure 14.7MPa 39.2MPalength 2m 2mFull duration : Approx.200014 ●52MPaG1/4 for JIS Nitrogen bottle-Type AW22-14W23-14 for JIS Nitrogen bottle-Type BTitle : 中村工機-P09∼17.ec6 Page:15 Date : 2014/12/15 Mon 09:21:34■Model symbols : Circuit diagramCharging Hose Assembly Charging Valve ↓ ↓ VR ※ TS ※×※ −Bleed plugLengthPressure gaugeLeave blank if it is standard ( 2m ) .Charging Hose assemblyEnter the no. of length you desire. Indicate the rat imperativeness, ( kgf/ ) -150, 400 Hose TypeConnecting to accumulator, 8V1 ( TV8 ) Max scale of pressure gauge- ( indicated in MPa. ) ( Pressure estimate size is AT 1/4 ×φ60 ) Charging Valve type : VR-type for an storage battery with a coreless character gasoline valve note : If the charging gas press is less than 1MPaG, please let us know before you order.3. Melting plug : Melting fireplug is a condom device to protect the collector from abnormally high temperature environment.■ Features : ●Melting spark plug does n’t have moving parts, so it is dependable as a base hit device. ●Because Melting plug is installed separate from the gas supply valve seat, there is not damage due to charging gases. ●Even if the fuse is melted by fire catastrophe, the valve-guard prevents the melted nibble from blasting off. ●Because Melting chew is being incorporated into the valve stem of bladder, this is renewed by replacing the bladder and no extra space is required. ●Melting chew is safe against external shocks, etc. Standard melting temperature is 105 ± 5℃. The temperature is designed for the hack to start melting at the time when the roll up pressure increases higher than the storage battery ‘s soap blackmail. After that, the accumulated flatulence is discharged from the punch fix and controlled not to greatly exceed the soap press. Please take care that there is a hypothesis the plug starts melting during operation in high temperature environment over 80 ℃, and it leads gas escape. In this shell, we recommend to use Melting plug for gamey temperature, that starts melting at 180 ± 10℃. To select allow condom device, please let us know before you order.Gas valve assemblyMelting plugGasket Fusible metalN2 gas1 5 ●Title : 中村工機-P09∼17.ec6 Page:16 Date : 2014/12/15 Mon 09:21:36OPF Series OIL PORT FLANGE If a flange joining is applied, we recommend to choose it from models shown in the followings. ■Model symbols : G 230 − 10 − 20 − OPF − B20 ( Require a copulate flange. ) Please indicate the oil port flange model name if applied. In addition, please let us know whether a coupling flange is required or not. Blank means to select our standard bushing ( Rc3/4 ). Rubber material Nominal gas volume of the storage battery ( ) Maximum sour imperativeness. Accumulator series. ※ All anoint larboard flange comes with sealing wax parts. For 1 to 60 liter accumulators Oil port flangeMating flangePressNominal volumeModelNominal dia.mmA B C d1 d2 T G ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) 15(B) 88 45 28 16 22.2 25 M12 1 ∼ 5 OPF-A 20(B) 88 45 28 20 27.7 22 M10 25(1B) 88 48 28 24 34.5 28 M12 15 ( B) 88 45 28 16 22.2 25 M12 20.6 20(B) 88 45 28 20 27.7 22 M10 MPa 25(1B) 88 48 28 25 34.5 28 M12 10 ∼ 60 OPF-B 32(1B)118 56 32 31.5 43.2 28 M12 40(1B)118 65 32 35 49.1 36 M16 50(2B)144 75 40 35 61.1 36 M16 15(B) 88 45 28 16 22.2 25 M12 1 ∼ 5 OPF-C 20(B) 88 48 28 20 27.7 25 M12 25(1B)118 56 32 24 34.5 31 M16 15(B) 88 45 28 16 22.2 25 M12 34.4 20(B) 88 48 28 20 27.7 25 M12 MPa 25(1B)118 56 32 25 34.5 31 M16 10 ∼ 60 OPF-D 32(1B)118 65 32 31.5 43.2 31 M16 40(1B) 144 75 40 35 49.4 39 M20 50(2B)156 84 48 35 61.1 47 M20 ◎ Please let us know whether a felt flange is necessary or not.Mating flangeStandardG25 G30 G35 G25 G30 G35 G40 G50 G50 G25 G30 G35 G25 G30 G35 G40 G50 G60NHA15 SHA20 SSA25 NHA15 SHA20 SSA25 SSA32 SSA40 NHA50 NFA15 NFA20 NFA25 NFA15 NFA20 NFA25 NFA32 NFA40 NFA50Nakamura in-house standardMating flangeStandardJIS B2291 Nakamura in-house standardJIS B2291Nakamura in-house standardFor eminent menstruation ( H type ) and 40 to 230 liter accumulators Oil port flangeMating flange1 6 ●PressNominal volumeModelNominal dia.A B C d1 d2 T e H ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) ( millimeter ) 32(1B)φ118 56 44 31.5 43.2 28 16 G40 M12 SSA32 40 ( 1 B) φ 135 65 44 37.5 49.1 36 18 G50 M16 SSA40 20.6 OPF-S 50(2B)φ144 73 44 47.5 61.1 36 20 G60 M16 SSA50 JIS B2291 MPa 65(2B)φ185 92 45 60 77.1 45 22 G75 M20 SSA65 80(3B)φ200 103 45 71 90.0 45 25 G85 M22 SSA80 10H∼ 32(1B)□ 153 110 44 32 43.2 43 18 G80 M24 NHFA32 60H 40(1B)□ 153 110 44 40 49.1 43 20 G80 M24 NHFA40 22.6 in-house and OPF-H 50(2B)□ 153 110 44 50 61.1 43 23 G80 M24 NHFA50 Nakamura criterion MPa □ 65(2B) 153 110 44 64 77.1 43 28 G80 M24 NHFA65 40∼ 80(3B)□ 153 110 44 71 90.0 43 31 G80 M24 NHFA80 230 32(1B)□ 176 116 45 32 43.2 44 18 G65 M27 NHFA32J 40(1B)□ 176 116 45 40 49.1 44 20 G65 M27 NHFA40J 34.4 in-house OPF-J 50(2B)□ 176 116 45 50 61.1 44 23 G65 M27 NHFA50J Nakamura standard MPa □ 65(2B) 176 116 45 56 77.1 44 28 G65 M27 NHFA65J 80(3B)□ 176 116 45 56 90.0 44 31 G65 M27 NHFA80J ◎ Please let us know if you need the product in other standard such as ASME, API, JPI, DIN etc. or specify the material.Title : 中村工機-P09∼17.ec6 Page:17 Date : 2014/12/15 Mon 09:21:37BAB Series HYDRO-LUNG■ Features : Directional master valve●Preventing befoulment of the hydraulic fluid ●Preventing vaporization of hydraulic fluid such as water glycolBreatherHU anoint level on cylinder ascentHow to select the model HL (1)Calculate the soap supplanting of the hydraulic fluid oil tied on cylinder descent in the petroleum reservoir π Vk = d2s・10−6 4 Vk : Max translation of hydraulic fluid ( ) vitamin d : diameter of the piston perch ( millimeter ) south : Cylinder stroke ( millimeter ) (2) Calculate the soap flow rate at the time of the supplanting ( Vk ). Vk Q0 = ・60 Tc Q0 : Max run rate ( /min ) Tc : operational time of the cylinder ( sec ) (3)Comparing the account soap flow rate with the allowable stream pace, decide the choice method of the collector. Q0 ≦ Q Q : Max permissible stream rate ( /min ) Hydro-LungFig.1 Example of Hydro-Lung useFig.2 BreatherAs a result, when Qo is less than Q, it is needed to select a hydro-lung which utmost displacement is adequate to Vk ( Ref. the below model list ). But if Qo is more than Q it is better to increase the number of hydro-lungs. As Fig. 1 exemplar of Hydro-Lung consumption, the petroleum grade changes at the lapp sum as the piston rod volume according to the hydraulic cylinder operation. At the same time, Hydro-lung absorbs the ascent and fall in the air chamber. In early words, the bladder of Hydro-lung expands along with increase of the oil-level and constricts according to decrease of the oil-level. Because a breath valve is equipped, Hydro-lung is effective at the situation besides where the anoint level greatly changes due to supplying operation oil or replace devices. concretely speaking, the bladder of Hydro-lung constricts along with decrease of the oil-level. After that, the bladder absorb atmosphere from the void valve ② via filter ③. conversely, the bladder expands along advance of the oil level or along addition of the coerce in the tune bedroom. After that, the breeze discharges to outside through the relief valve ①. In addition, Hydro-lung can prevent the vegetable oil reservoir from the contamination ascribable to external atmosphere since the inside is isolated from the outside.BreatherRc3/4 to tankModel BAB 1 BAB 2.5 BAB 4 BAB 10 BAB 20 BAB 30 BAB 50Max volume of breath ( ) 0.8 1.6 2.4 6.0 11.7 21.0 32.0Max allowable flow rate Q ( /min ) 47.1 47.1 47.1 152.6 152.6 152.6 152.6A ( millimeter ) B ( millimeter ) C ( millimeter ) D ( millimeter ) Mass ( kilogram ) 167 355 225 376 666 1187 1673384 572 442 635 925 1446 1932217 217 217 259 259 259 259114.3 114.3 165.2 216.3 216.3 216.3 216.36 9 10 16 24 38 52Max W.P. ( MPa ) 0.031 7 ●Title : 中村工機-P18∼21.ec6 Page:19 Date : 2014/12/15 Mon 09:26:46Accumulator stand We design and manufacture storage battery stands that several accumulators are put together on in addition to supplying a single collector. Accumulator stands equipped with not merely accumulators and the piping but besides diaphragm valves, atmospheric pressure gauges, pressure switches, early hydraulic devices and stainless sword pipes can be provided. For example, the collector stand with deck stand is designed to check the boast pressure or to maintain the collector safely and the collector stand with adjust bolts is designed to replace bladder and maintain the storage battery assembly without using hang tools or machines such as cranes. The accumulator bandstand is completely bespoke, so it is possible to design it in individual line, double lines or etc. as customer requirement in circumstance of customer ‘s facility space.● Following pictures are sample model.18 ●Title : 中村工機-P18∼21.ec6 Page:20 Date : 2014/12/15 Mon 09:26:47Accumulator base photos supplied in pastAccumulator stand with 12 sets of 220L accumulatorAccumulator stand with 10 sets of 230L storage battery ( 31MPa ) ( 17MPa ) Accumulator stand with 4 sets of 120L accumulatorGas cylinder stand with 8 sets of press vessel for N2 ( 1MPa ) natural gas ( 20MPa ) 1 9 ●Title : 中村工機-P18∼21.ec6 Page:21 Date : 2014/12/15 Mon 09:26:48PA Series Piston type collector We started to produce piston type accumulators with our own engineering in 1967 and after 3 years, ones of 150 liter was supplied to Nippon Steel Corporation Oita factory for their slab continuous hurl machine. Since then they have been widely used by many customers and applications such as the Ministry of Defense in Japan, power plants, hydraulic controls, etc. ■Model symbols : ■ Features : PA 230 − 20 − 20 − LSBecause low friction carry is used, the chute friction is small.With a sensorThere is no limitation in the proportion between N2 gasSeal materials…20. ( NBR ) for mineral oilprecharge pressure and hydraulic pressure.28. ( FKM ) for Phosphate esterLarge gas volume type and high pressure typeNominal gas volume of the accumulator ( ) can be provided.Max work press Piston type accumulatorDimensions Max W.P. ModelPA230−20 −40 −60 −100 ( MPa ) 22.6Gas bulk Mass ( ) 20 40 60 100 ( ㎏ ) 160 220 490 605A ( millimeter ) 953 1562 1380 1860B ( millimeter ) C ( millimeter ) D ( millimeter ) 241.816355.687E ( millimeter ) 36F Standard size is φ49.1 ( 40A ) or less. Please letus know if it is 50A or more as special.◎ Please let us know the consumption condition and the manoeuver fluid. ◎ As a particular specification, bombastic menstruate pace type can besides be provided. ◎ The collector with ASME stamp, CE ( PED ) score or chinese certification can be manufactured. ◎ The accumulator available to flame retardancy oil or chemical fluent can be provided.2 0 ●◎ Equivalent accumulator to cleanliness class NAS6 can be provided.Maxflow rate ( /min ) 990 2200Title : 中村工機-P18∼21.ec6 Page:22 Date : 2014/12/15 Mon 09:26:49Piston type accumulator with a sensorLS SeriesA detector is being installed inside the piston type collector to comply with hydraulic systems electronically controlled, and it outputsControllerelectric signals endlessly and detects the position of the piston ofOutput signalthe accumulator.■ Features : Power sourceDetecting the position of the piston continuously. Because the available free total can be confirmed by detecting the piston placement, it is potential to forecast the sustenance inspection time. The detector is placed at a non-pressurized area, so the life is long. Because the detector is absolute type, Zero-point setting and Zeropoint correction are not necessary. Output bespeak comply to voltage and stream is analogue, so the piston position can be easily detected. The end product sign can be indicated in a digital counter and the bespeak data fetched to personal computers can be utilized to high level control condition system. A high level see is achieved by using the detector in combination with a atmospheric pressure transducer. It is potential to measure fuel release amount in detail. A detector can be applied to all piston type storage battery ( Ref. P20 ) .Example 1Example 2 Power sourcePower sourceController ACCVoltmeter or AmmeterController ACCIn sheath of analogue end product A/D converterDigital counter, personal computer, etc.In case of digital output2 1 ●HYB SeriesN2 ɡas boosterN2 gas booster has high energy saving effect. Our piston type accumulators that have a long application history and high dependability that we are gallant of are being installed in it as an compressor.■ Features : ◦ Compact portable type ◦ Low noise ◦ Small might consumption ◦ Cooling water system is not required. ◦ easy sustenance with elementary structure ◦ Less expensive than conventional compressorsCircuit diagramN2t°22HYB SeriesN2 ɡas boosterES Type■ Model symbols : HYB 10 − ES 2 − 24 − 7.5 × 220V Power source electric potential ( ※ Please volunteer this infomation in overture. ) Electric motor end product ( kilowatt ) Maximum N2 gasoline generate pressure ( MPa ) ( Max W.P of Hyd. pump Minus 1.5 ) Design phone number Type ES : electric restraint type Booster ( Compressor ) book ( ℓ ) Hydraulically driven promoter unit Reference information from proven specification ( Standard model ) SpecificationMotor output/cycle Max generated boast pressure Booster Unit Dimensions Mass Max working imperativeness Hydraulic Delivery Pump Revolution Type Compressor VolumeModel kW/Hz MPa millimeter kilogram MPa ℓ/min rev./min ℓES 7.5/60 ( 7.5/50 ) 24 750 × 1160 × 1590 600 25.5 10.6 1800 ( 1500 ) Piston type 10Note : This product is not desirable for farseeing clock continuous operation because this is for charging N2 gas into our standard storage battery. If you intend to use this product in early function than the above, please let us know before you order.23FHN SeriesAccumulator Stop ValveEver since we started to distribute FHN series as accumulator blockage valve in 1985, this product is long-familiar for many achievements and the reliability.■ Features : ◦ Compact design with small count of components. ◦ immediately connecting to an collector is potential. ◦ Balance structure and a carriage take mathematical process to open and shut easy even at high pressure. ◦ It can be used both as a end valve and a accelerator valve. ◦ Chattering will not occur because the main valve is being screwed to the valve perch. ◦ By using an collector articulation, the bladder can be replaced without removing an accumulator from the system. ◦ Stainless steel ( SUS304 ) type can be provided.FHN32S & FHN65SModelFHN32LDimension d A B C D E F G H I J K L M N P Q R Applicable ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) ( ㎜ ) accumulatorFHN32S FHN65S FHN32LRemarksConnect to OPF-E-40 Connect to φ56 320 200 120 153 80 114 − 210 − 48 98 38 G¼ 88 110 M24 122.0 OPF-H HF&40〜 Connect to 230ℓ φ30 217 111 106 104 52 77 104 154 50 48 70 18 G¼ 88 − − 55.5 collector directlyMax W.P. ( MPa ) φ30 217 111 106 104 52 77 − 155 − 48 70 18 G¼ 88 75 M16 55.5 10〜60ℓ34.4※OPF-E and OPF-H are especial type flange. ※If FHN65S is applied to accumulators with 10 to 60ℓ capacity, it is connected to OPF-E-40 by using a spacer additionally. ※When the accumulator is connected to a drain port, two kinds of joint of a bite type joint and a weld character joint are our standard survival ( Ref. pictures at right side ). Please specify either of them as you place an order.Bite type fit ( K ) 24Weld type fitting ( W ) FHN SeriesAccumulator Stop Valve Circuit diagram : ACCTo enfeeble port ( G1/4 ) To main port■ Model symbols FHN 32 S − 20 − N − F1-1/4B − K − S7 Mark for NAS cleanliness class. If standard ( not required the class ), no set. connection parts to a drain port N : No mark ( prepared by customer ) K : Bite type pipe joint W : Weld type organ pipe articulation Connection parts to a independent pipe N : No target ( connecting to a inline stuff arranged individually ) F1-1/4B : Weld type checkmate flange ( Connection size shall be written after “ F ”. ) joining parts to an accumulator N : No mark ◦ In case where FHN32L is applied. ◦ In case where a checkmate flange ( standard ) or an accumulator joint is applied. varnish parts substantial 20 : NBR※T he standard connecting direction is to use a28 : FKMmating flange.Connection measureHowever this clock time, we would like to showS : get in touch to a flangethe way to connect an inline forget by usingL : Connecting directly to an accumulatorbelow picture.The larboard size of the diaphragm valve Accumulator stop valveExample of use : connection by OPFDirect Connection to accumulatorConnection by an storage battery joint25Hiɡh Pressure Gas Cylinder We design and manufacture high pressure natural gas cylinders by taking advantage of the prove know-how that we have cultivated in collector manufacture. concretely speaking, cylinders we supplied is 1 to 500 liter in capacity and the soap pressure is 49MPa. The material of cylinders is not only carbon steel but besides stainless steel. The cylinder has many uses, for exemplar, it has been used successfully as a receiver tank for piston type collector or as pressure vessel of versatile gases. If the cylinder is used as a receiver tank, it is possible to provide the unit composed by a piston type collector and the cylinder. The cylinder complying with the Designated Equipment Inspection Regulation of High Pressure Gas Safety Act can be supplied. And it is besides possible to provide cylinders designed by ASME or by respective categorization survey.Note : 1. The high imperativeness boast cylinder is different from the vessel under the Cylinder Safety Regulations of High Pressure Gas Safety Act. 2. This merchandise is completely bespoke, so it is possible to design it as customer demand.26NAKAMURA KOKI REQUEST FORM for selecting accumulatorDate : Your company name Tel E-mailContact person System name・Installation position Intended use of accumulatorsA. Energy StorageB. Pulsation Damping C. Surge Absorption□ Bladder TypeA rubber cup of tea is used to separate N2 gas from melted. It is used to variety applications such as energy storage by accumulating and discharging energy, pipe pulse absorption, scend assimilation and etc. Our accumulators, not alone bladder character but besides piston type, are of help in energy save and improving equipments.□ Piston TypeA piston is installed to separate the supercharge liquid and the gases. This collector is reliable without sudden accidents such as the bladder damage. The especial remainder to the bladder type is that a super boastfully capacity model and ultra-large flow model can be manufactured in this piston type.Type of AccumulatorsD. OtherPlease fill out 1 ~ 4 for the storage battery excerpt. 1. inspection, Standard, etc. 2. Operating Condition □ Unnecessary (Nakamura Koki inner standards)3. The Bladder Material MPaNormal Working PressureMaterialUsed FluidTemperature range□ High Pressure Gas Safety Act in JapanDesign Temperature□ 10(NBR)Nitrile rubberFor low temperature-25 ~ + 80℃Normal Working Temperature□ 20(NBR)Nitrile rubberMineral oil, Water glycol-10 ~ + 80℃□ ASMEWorking Temperature Range~ ℃□ 30(CHC)EpichlorohydrinGasoline・Aromatic material-10 ~ + 90℃□ China standardWorking Fluid□ 40(IIR)Butyl rubberPhosphate ester-10 ~ + 90℃□ CE-MARKInstallation Site□ Indoor□ Outdoor□ 28(FKM)Fluorine rubberChemical material, etc- 5 ~ +120℃□ Others() Installation Direction□ Vertical□ Horizontal※ If the corporeal of arctic is unknown, please let us know the working fluid and the solve temperature range.4. Specification(a ~ e) a. Connecting parts in the oil sideb. Parts/device in the gas sidec. Safety devicee. Paint□ Bushing Connection threaded port size [ □ Coreless type gasoline valve (Nakamura Koki Standard)□ Melting Plug (Nakamura Koki Standard)□ Unnecessary(Parkerizing)□ Rupture Disk Type□ Nakamura Koki Standard Undercoating:Synthetic resin Final coating:Phthalic acidic resin Paint color:Munsell N7 (JPMA color codes N-70)□ Oilport flange model name(Ref. P16) ] [ Mating Flange [ applied・not-applied ] □ Oilport Flange ’ s Standard and the size ] [ □ Without connection parts □ Others [ □ Core type accelerator valve □ Coreless Type Gas Port Pressure Gage Unit [ □ Special [ ] d. Name Plate□ N a k a molarity uracil roentgen a K o kelvin iodine S t a n d a gas constant d Name Plate □ Flange(Standard name・size) [ ] □ Specified Name Plate (Please attach specifications)□ Special (Please bind specifications)※ early especial specifications : Please select the intended use of accumulators from A ~ D and fill in the blanks. A. Energy Storage Available Discharge book of Acc.B. Pulsation Dampening ΔV□ Plungerℓ Pump TypeMax Working PressureP3MPaMin Working PressureP2MPaAverage Working PressurePrecharge PressureP1MPaSetting Pulsation RateDischarge TimeTnsecCharge TimeTmsecRequired Discharge Flow.ℓ/minC. Surge Absorption□ Diaphragm □ weathervane [ ] cylinder □ Single acting □ Double acting□ gearPx -Normal Working PressurePAMPaMax Allowable PressurePBMPaPrecharge PressureP1MPaFluid Densitykg/m³MPaInside Diameter of PipemmLength of PipeFlow Rate of Fluidℓ/min□ MPa %Max Allowable PressurePmPrecharge PressureP1MPaPump Deliveryℓ/minRevolution of Pumprpm※ D.Other※ CAD data and the capacity calculation program, you can be downloaded from our web site. Our introduction columnRecommended ModelNoticesSales office・the person in chargeSelection Date27NAKAMURA KOKI CALCULATION FORM for energy storageDate : system Name・Use Place ◎ Please use the absolute blackmail in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ). available Discharge volume of Acc.ΔVℓ The discharge in the press change from P3 to P2.Max Working PressureP3MPaA The utmost imperativeness when the fluid accumulatesMin Working PressureP2MPaA The minimal blackmail when the fluid dischargesPrecharge PressureP1MPaA ①Average Working PressurePxMPaA ( P3 + P2 )/ 2Discharge TimeTnsec Time to discharge the fluid by Δ V liter from the accumulatorCharge TimeTmsec Time to accumulate the fluid by Δ V liter to the accumulatorPolytropic Exponents at Discharge TimePolytropic Exponents at Charge TimeAccumulator Gas VolumeV1① Calculation for determining the precharge atmospheric pressure value② ℓ ③ b. W hen there is temperature change, the below recipe is applied.a. P1 = 0.9 × P2( Min working pressure)273+Mi newton temprature (℃) working pressure) 2 P1 = ×0.9 × P(Min 273+Max temprature(℃)※ Please apply the value of a or b.The precharge press range : 0.25 × P3 ≦ P1 ≦ 0.9 × P2 ◎ If the precharge blackmail is higher than the value calculated at the above, storage battery capacity becomes smaller but it is not recommended because the life cross of the bladder becomes shorter. ② Polytropic ExponentsCheck the discharge time(Tn), the commission time(Tm)and the average sour pressure(Px)and confirm the polytropic advocate at discharge time(n)from the graph shown in page 3. The polytropic exponent for care time (m)is n- 0.2. ( To compensate the dearth of boast volume(V1), the value of megabyte is 0.2 less than the value of n.) Ex. P2 = 16.1MPaA P3 = 21.6MPaA Average working pressure=18.85MPaA If Tn is 1.5sec, “ normality ” is confirmed as 1.85 by the graph shown in foliate 3. If Tm is 120sec, “ molarity ” is confirmed as 1.48-0.2=1.28 by the graph shown in page 3. ※ In the event of isothermal change, north = thousand = 1. ※ In the lawsuit of nitrogen < m, make the value of `` newton '' lapp as `` thousand ''. ※ If the value of megabyte is ill-defined because the change time is not fixed, we recommend to make the value of m as one (1) to put flexibility into the capacity.③ Accumulator Gas book Calculation FormulaV1=ΔV×P2× P3 P21 m( ) 1 n-1 ( ) { } PP1×P3 2ℓ×MPaAMPaAMPaA× (MPaAMPaA1/) MPaA1/-1※ A classifiable estimate such as `` Gross efficiency of accumurator '' defined in other manufacturer 's own right is not included in our calculation convention. Calculation ExampleAssume that we select accumulator being installed in hydraulic pressure pipe line as energy storage. By using the stick to calculation, we confirm the collector flatulence capacity and confirm the soap permissible fire run. The detailed specification is shown in the below table. Conditions precedent : discharge prison term = 1.5 second, Charge time = 120 securities and exchange commission, Ambient Temperature = 26 ℃, Temperature during operation = 50 ℃ Available Discharge volume of Acc. ΔV Max Working Pressure P3 Min Working Pressure P2 Preharge Pressure P1 Polytropic Exponents at for fire normality clock time Polytropic Exponents at charge time molarity ※ Refer to the polytropic exponents in ② Ex.3.7ℓ 21.6 MPaA 16.1 MPaA 13.4 MPaA 1.85 1.28Precharge pressure(P1):273 + 26 P1 =——————× 0.9 × 16.1 = 13.4MPaA 273 + 50Accumulator gas volume(V1) : V1 =ΔV×P2× P3 P21 m( ) 1 n21.6-1 ( ) { } PP1×P3 23.7 × 16.1 ×( 16.113.4 × (21.6 16.11/1.281/1.85-1=32.5ℓConfirmation of maximum allowable dismissal Flow(Qmax)Qmax=3.7ℓ×60 ΔV×60 = = 148ℓ/min Tn 1.5secFrom the above calculation, the want storage battery 's officiate is that the storage battery boast volume(V1)is 32.5ℓ or more and the utmost permissible discharge flow is 148 ℓ/min. In the case, the recommend collector model is G/T230-30. Please select the accumulator model from this catalog in consideration of the maximum work pressure(P3), the accumulator natural gas volume(V1)and the maximum permissible fire flow(Qmax)28NAKAMURA KOKI CALCULATION FORM for pulsation dampingDate : system Name・Use Place ◎ Please use the absolute pressure in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ) Pump Type Average Working Pressure( )cylinder [ Single acting・Double acting ] PxF1:Pump CoefficientMPaA Average coerce of the liquidMax Allowable PressurePmMPaA Maximum atmospheric pressure of the liquidPrecharge PressureP1MPaA ①Pump Deliveryℓ/min -Revolution of Pumprpm -Pump Type Simplex DuplexPump Delivery per RevolutionPolytropic ExponentPump CoefficientF1From table shown on the right handAccumulator Gas VolumeV1① Calculation for determining the precharge coerce valueℓ/rev q = Q(Pump manner of speaking )/ N(Revolution of pump )Quintuplea. P1 = 0.6 × Px(Average working pressure)0.60Double acting0.25Single acting0.25Double acting0.15Single acting0.13Double acting0.06Single acting0.10Double acting0.06Single acting0.06Double acting0.02b. When there is temperature switch, the below formula is applied. 273+Min temprature(℃) P1 = ×0.6 × Px(Average working pressure) 273+Max temprature(℃)Check the average solve pressure(Px)and confirm the polytropic exponent from the graph shown in page 3. Please reach our sales position if you have any questions.③ Gas book Calculation Formula of the AccumulatorQuadruplexℓ ③※ Please apply the prize of a or barn. ② Polytropic ExponentsTriplexF1 Single actingV1=Pxℓ/minrpm( ) Pq×F1×Px1 n( ) P1-1- (MPaA×(MPaAMPaA1/) MPaA※ A classifiable estimate such as `` Gross efficiency of accumurator '' defined in other manufacturer 's own right field is not included in our calculation rule. Calculation ExampleAssume that we control the pump pulsation within 3 % of the average ferment press. By using the pursuit calculation, we confirm the collector gas capacity. The detail specification is shown in the below table. Pump type:Plunger Pump Simplex Single acting Average Working Pressure Px 5.1 MPaA Max Allowable Pressure Pm 5.25 MPaA Precharge Pressure P1 3.1 MPaA Pump Delivery Q 32 ℓ/min Revolution of Pump N 62 revolutions per minute 0.60 Pump Coefficient F1 Polytropic Exponent north 1.51Accumulator gas volume(V1)V1=Px( ) Pq×F1×Px Pm1 n( )1-5.1 32 × 0.60 ×( 3.1 62 5.1 1/1.511- (5.25= 26.8ℓFrom the above calculation, the storage battery natural gas volume(V1) of 26.8ℓ or more is required to control the blackmail within 3 % of the average work pressure.(In the virtual aspect, ※ P olytropic exponent at the average bring because the flow speed and the duration of the connecting pipe coerce 5.1MPaA is determined from the table is involved, it becomes a prey value.) In the case, the recommend storage battery mannequin is G/T175-30. in page 3. As to the effects of pulsation dampener, please refer the sample in page 7.Please choose the storage battery model from this catalog in retainer of the maximum work pressure(Pm)and the collector accelerator volume(V1).29NAKAMURA KOKI CALCULATION FORM for billow absorptionDate : system Name・Use Place ◎ Please use the absolute blackmail in the calculation(Absolute pressure(MPaA)= Gauge pressure(MPaG)+ 0.1 ). normal Working PressurePAMPaA Pressure in the pipe where the billow imperativeness has not been generated.Max permissible PressurePBMPaA Maximum allowable billow pressurePrecharge PressureP1MPaA ①Inside Diameter of PipemmLength of PipeFluid Densitykg/m³Mass of Fluid in LineFlow Rate of FluidFlow Velocitym/sec ④Polytropic ExponentAccumulator Gas VolumeV1ℓ ⑤① Calculation for determining the precharge pressure valuePetroleum-based hydraulic vegetable oil ≒ 900 kg/m³Phosphoric acid ester-based hydraulic oil ≒ 1100 kg/m³Water ≒ 1000 kg/m³kg ③ ℓ/minb. When there is temperature change, the below formula is applieda. P1 = 0.9 × PA273+Min temprature(℃) P1 = ×0.9 × PA 273+Max temprature(℃)※ Please apply the value of a or b. ② Polytropic ExponentCheck the normal bring pressure(PA)and confirm the polytropic advocate from the graph shown in page 3. Please contact our sales office if you have any questions.③ Mass of Fluid in Line(M) Calculation formulaπ π -3 2 M = ×d2×L×ρ= ×( Inside diameter ×10 )× Length × Fluid concentration = 4 4④ Flow Velocity(ν)Calculation formula ⑤ Accumulator Gas volume Calculation FormulaFlow ratem/secυ= 21.23 × = 21.23 × = 2 2 Inside DiameterV1 =M × v 2 ×(n-1) n-1 B nkgm/sec×( -1)-1 ×( ( ) { } 2000 × { P2000×P1×kgMPaAMPaAMPaA□-1 □-1※ A classifiable theme such as `` Gross efficiency of accumurator '' defined in early manufacturer 's own right is not included in our calculation formula. Calculation ExampleAssume that we reduce the rush imperativeness caused by sudden close of the valve that installed at the end of a pipe. The detail stipulation is shown in the under postpone. Condition precedent : external diameter = 8 B × Sch 40 ( JIS : 216.3 millimeter × Thickness 8.2 millimeter ) Normal Working Pressure Max. allowable imperativeness Prechargie Pressure Inside Diameter of Pipe Length of Pipe Fluid Density Mass of Fluid in Line Flow Rate Flow Velocity Polytropic ExponentPA PB P1 vitamin d L ρ M Q ν n0.85 MPaA 1.35 MPaA 0.75 MPaA 199.9 millimeter 700 molarity 900 Kg/m3 19772 kilogram 4500 ℓ/min 2.4 m/sec 1.407Mass of Fluid in Line π-32 M= ×d ×L×ρ= × (199.9×10 )×700×900=19772 kg 4 4Flow VelocityQ 4500 volt =21.23 × 2.4m/sec 2 = 21.23 × = vitamin d 199.92Gas volume V1=M × v 2 ×(n-1) n-1 B n19722 × 2.4 ×(1.407 -1)1.35 -1 ( ) { }2000×0.75× P {( 0.85 )2000×P1×1.407-1 1.407-1= 216ℓ※ Polytropic advocate at the average solve From the above calculation, the storage battery flatulence volume(V1)is coerce 1.1MPaA is determined from the 216ℓ or more is required. mesa in page 3. In the encase, the commend collector model is TL175-230 ''. Please select the collector model from this catalogue in consideration of the utmost work pressure(PB)and the accumulator gasoline volume(V1).30Title : 中村工機-P31.ec6 Page:19 Date : 2014/12/15 Mon 09:30:00Safety Precautions for AccumulatorsThe storage battery is a blackmail vessel containing pressurized fluid in it. Read the mathematical process manual and good understand its subject before using the vessel. To prevent injury to persons or damage to the storage battery, observe the base hit precautions below. 1. Selecting an accumulator !CAUTION : Accumulators are coerce vessels which are controlled under laws and regulations according to their plaza of use, pressure, and capacitance. When selecting an accumulator, be aware of such regulations. !CAUTION : Select an accumulator which is compatible with its usage conditions, such as operate atmospheric pressure, amount of work oil to be pressurized, operating temperature, type of fluid to be charged in the collector, environmental considerations, and applicable regulations. If a incorrect accumulator were selected, it could not lone fail to perform to expectations but besides adversely feign interconnected machines. 2. Installing an accumulator !WARNING* : Do not attempt to weld any thing to or drill a hole in an accumulator. Such an act would jeopardize its safety and could cause it to explode. !CAUTION : dependable an accumulator to the frame or wall with a dance band or early desirable means. If such a patronize were neglected, shaking ( due to normal operation or earthquake ) would excessively stress the accumulator, and could finally loosen its fasteners. !CAUTION : Do not subject an storage battery to external heat. Put up a heat shield around the collector if it is near a heating system source or exposed to direct sunlight. If an collector were heated from outside, the fluid at heart could build up a perilously high press. !CAUTION : As a safety meter, provide a imperativeness master valve in the shoot system at a localization near and immediately connected to the collector so that its utmost allowable pressure will never be exceeded. 3. Charging an storage battery with nitrogen gas ( precharging ) !WARNING* : entirely use nitrogen accelerator as the fluid precharged in an storage battery. Never use oxygen or flammable boast because it could cause a fire or explosion. !CAUTION : While no regulative qualification is required ( in Japan ) for a person to charge an storage battery with nitrogen gas, it is authoritative for personal safety that the person be trained for handling hard-hitting gases. When charging an collector with nitrogen gasoline, use a charge fabrication which is compatible with the storage battery. 4. Using a consign assembly !CAUTION : A charge assembly is used for precharging, replenishing, or atmospheric pressure calibration. Attach a load assembly to an collector lone earlier function, and always remove it from the collector after function. A charging assembly as permanently attached to an collector could increase the possibility of accelerator leak or wrong to its instruments. 5. Using an storage battery !WARNING : see that an collector is used at pressures not exceeding its maximum function blackmail ( design pressure ). excessive pressure could cause the accumulator to explode. !CAUTION : Do not leave an accumulator charged only with pressurize fluent but not with work oil for more than two weeks. differently, the bladder rubber could permanently stick to the inside open of the shell. 6. Maintaining an collector !CAUTION : To ensure utmost performance of an collector and the integrity of its bladder, check and adjust an accumulator veracious after precharging, one week after the precharging, and every three months thereafter. When measuring the pressure of the fluid in an collector, the blackmail inside the influence oil circuit must be equal to the pressure of the outside atmosphere. 7. Disassembling, reassembling, or discarding an storage battery !WARNING* : Reduce the atmospheric pressure inside the work anoint circuit to the imperativeness of the air and completely discharge the fluid from the accumulator before attempting to disassemble it. If you attempted to disassemble it with some pressure inside, you could be injured by the pressure. !WARNING* : Before discharging the fluid from an accumulator, ensure that the area is well ventilated. otherwise, there could be a danger of oxygen insufficiency. besides ensure that there is no person or objects that could be easily flown away in the direction in which the fluid is to be discharged. differently, the hard-hitting jet of the exhaust fluid could injure a person or damage objects. !WARNING : After disassembling an accumulator, check and ensure that there is no significantly corroded, scratched, or deformed separate in it before reassembling it. Any degraded separate used undetected could endanger the guard of the storage battery. !CAUTION* : If a T-series storage battery is disassembled and its bladder is removed off through the top part, discharge away any fluid persist at the bottom before replacing a new bladder. otherwise, the new bladder could be deformed and damaged by the buoyancy from the remaining fluid. !CAUTION* : When discarding an storage battery, first release both work vegetable oil and fluid pressures to the atmosphere, and then disassemble it and take necessity measures to make it unserviceable. note : The warning or circumspection statements with the word warn or CAUTION indicated by the star ( * ) above are besides marked on an collector in the shape of a label.Title : 表4のみ.ec6 Page:1 Date : 2014/12/19 Fri 14:12:08Ever since our ship's company started to deliver bladder type accumulators in 1962, we do endlessly achieve customer gratification by supplying the unique products in high quality and special technic. If you have any questions or if we can be of avail in any direction, please do n't hesitate to let us know. We are looking forward to do business with you in about future ! 〈PRODUCT LINE〉 Bladder type accumulatorsPiston character accumulatorsDiaphram type accumulatorsAccumulator stop valveHydro-LungN2 boast boosters for charging gasAccumulators with sensorsIn-line character accumulatorsO-rings and special packings ( note : There is a possibilly that the contents of this booklet is changed without notice. ) HANGZHOU NAKAMURA KOKI HYDRO TECHNICA CO., LTD.The factory is approved by CE, AQSIQ ( China ), METI ( Japan ), and certified by ASME ( USA ), ISO 9001 ( Headquarter factory・accumulater ) Headquarter 18-43 Heizaemoncho, Amagasaki-shi, Hyogo-ken 660-0087, Japan factory Tel:81-6-6419-3791 FAX:81-6-6419-3795 e-mail : [ e-mail protected ] hypertext transfer protocol : //www.hyd-acc.co.jp Head office : 18-43 Heizaemoncho, Amagasaki-shi, Hyogo-ken 660-0087, Japan Tel:81-6-6419-7600 FAX:81-6-6419-3795 e-mail : [ electronic mail protected ] Tokyo office : 5-7-13-202 Shinbashi, Minato-ku, Tokyo 105-0004, Japan Tel:81-3-3435-1621 FAX:81-3-3435-1624 e-mail : [ e-mail protected ] Hiroshima office :5-28 Fukuro-machi, Naka-ku, Hiroshima-shi, Hiroshima-ken 730-0036, Japan Tel:81-82-248-4093 FAX:81-82-248-4096 electronic mail : [ electronic mail protected ] Factory in China :22-15-9 Sreet 22 HEAD Hangzhou, 310018 Zhejiang China. Tel : +86-571-2887-1126 facsimile : +86-571-2887-1125 e-mail : [ e-mail protected ] 14.08A 1000

Leave a Reply

Your email address will not be published.