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BOSCH REXROTH
HAB4-350-6X/150G07G-2N111-CE
R901435682
Bladder Accumulators

Bladder-type accumulators -6X: 4 Litre

$1,195.00

BOSCH REXROTH

MATERIAL:  R901435682

SUMMARY:  Bladder-type accumulators -6X: 4 Litre

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Applications:

Energy storage in systems with intermittent operation Energy reserve for emergencies Compensation for leakage loss Shock and vibration damping Flow compensation in case of pressure and temperature changes

 

Refer to data sheet RE 50171 for extensive details about the design HAB-6X and applications with CE certification.

Function, section

General information

Hydraulic accumulators are hydrostatic devices capable of storing a certain amount of energy in order to release it to the hydraulic system when needed.

Fluids only possess low compressibility; however, gases are highly compressible. The working principle of all gas-loaded hydraulic accumulators is based on this difference.

The difference between bladder and diaphragm type accumulators lies in the type of separator element. Hydraulic accumulators essentially consist of a fluid section and a gas section with a gas-tight separator element.

The fluid section has a connection to the hydraulic circuit.

If a higher liquid pressure is applied to a specific quantity of pressurized gas, the gas volume decreases as the liquid pressure increases, with the gas pressure increasing with the liquid pressure.

If the pressure of the fluid decreases, the fluid is pushed back into the hydraulic system by the expanding gas until the pressure is balanced again.

 

Bladder-type accumulator

Bladder-type accumulators consist of a seamless cylindrical pressure container (1) made of high-strength steel. An elastic bladder (2) mounted inside the container separates the accumulator into a gas side and a fluid side.

Via the gas valve (4), the bladder is filled with nitrogen up to the intended gas filling pressure p0.

The oil valve (3) located inside the oil port of the bladder-type accumulator closes if the pressure on the gas side is higher compared to the fluid side. This prevents the bladder from entering the oil channel and being destroyed.

When the minimum operating pressure is reached, a small fluid volume (approx. 10% of the hydraulic accumulator's nominal volume) should remain between the bladder and the oil valve in order to prevent the bladder from hitting the valve during each expansion process.

The gas valve (4) consists of sealing cap (4.1), gas valve insert (4.2), gas prefill valve body (4.3), and O-ring (4.4). These parts can be replaced individually.

The type cap (7) includes the technical data and features of the hydraulic accumulator.

Symbol

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litretechnical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

1

Containers

2

Bladder

3

Oil valve

4

Gas valve

5

Gas valve support

6

Nut

7

Type cap

8

Cover cap

9

Protective cap of oil valve

Ordering code

01

02

03

04

05

06

07

08

09

10

11

12

13

14

HAB

-

-

6X

/

0

G

-

2

1

1

1

-

Device designation

01

Diaphragm type accumulators

HAB

Nominal capacity

02

1 l

1

2,5 l

2,5

4 l

4

6 l

6

10 l

10

20 l

20

24 l

24

32 l

32

50 l

50

Maximum admissible operating pressure

03

350 bar 1 … 6 l

350

330 bar 1 … 50 l

330

Component series

04

Component series 60 … 69 (60 … 69: unchanged installation and connection dimensions)

6X

Gas filling pressure

05

0 bar

0

Port size for hydraulic fluid 1)

06

1

2.5

4

6

10

20

24

32

50

G3/4

G05

G1 1/4

G07

G2

G09

Type of mounting (oil port form)

07

Thread with sealing surface, radial on the inside

G

Gas port form

08

Gas valve for charging and test device

2

Bladder material 1)

09

NBR

N

ECO

E

FKM

F

HNBR

H

Tank material 1)

10

Steel

1

Surface of the tank inside 1)

11

Steel

1

Surface of the connection side 1)

12

Steel

1

Certification acceptance

13

CE (DGRL 2014/68/EU)

CE

Instructions for use

BA

14

Further details in the plain text e. g. SO variant

*

general

Nominal capacity

l

1 2.5 4 6 10 20 24 32 50

Weight

kg

7 10 16.5 20 32 53 61 85 123

Design

Bladder-type accumulators

Installation position

Bottom fluid connection socket, others upon request

Mounting type

With clamping collars and console

Line connection

Screw-in thread

hydraulic

Nominal capacity

VNenn

l

1 2.5 4 6 10 20 24 32 50

Effective gas volume

Veff

l

1 2.4 3.7 5.9 9.2 18.1 24.5 33.4 48.7

Maximum flow

qmax

l/min

240 450 450 450 900 900 900 900 900

Maximum operating pressure

pmax

bar

330 330 330 330 330 330 330 330 330

bar

350 350 350 350 - - - - -

Maximum admissible pressure fluctuation range

Δpdyn

bar

200 200 200 200 125 125 125 125 125

Hydraulic fluid 1)

Hydraulic oil according to DIN 51524

Hydraulic fluid temperature range

NBR

°C

-15 … +80 1)

ECO

°C

-32 … +80

FKM

°C

-20 … +80

HNBR

°C

-30 … +80
1) Other hydraulic fluids upon request.

pneumatic

Charging gas

Nitrogen, cleanliness class 4.0, N2 = 99.99 vol. %

Gas filling pressure

p0

bar

0

Hydraulic fluids

Material

Mineral oils

NBR

ECO

HNBR

HFC

NBR

HFD

FKM

NBR ‒ Acrylonitrile-butadiene rubber
ECO ‒ Epichlorohydrin rubber
HNBR ‒ Hydrated acrylonitrile butadiene rubber
FKM ‒ Fluorocarbon rubber

For applications outside these parameters, please consult us!

Calculation

Pressures

The following pressures are of decisive importance for the calculation of an accumulator:

p0 Gas filling pressure at room temperature and empty fluid chamber

p0 (t) Gas filling pressure at operating temperature

p0 (tmax) Gas filling pressure at maximum operating temperature

p1 Minimum operating pressure

p2 Maximum operating pressure

 

In order to achieve the best utilization of the accumulator volume possible as well as a long life cycle, compliance with the following values is recommended:

p0 (tmax) ~ 0.9 × p1   (1)

 

The highest hydraulic pressure should not exceed four times the filling pressure, as otherwise too much stress will be put on the elasticity of the bladder, resulting in too great a compression change with strong gas heating:

p2 ≦ 4 × p0   (2)

 

The life cycle of the accumulator bladder is the higher the smaller the difference between p1 and p2 is. However, the operating ratio of the maximum accumulator capacity will also be reduced accordingly.

 

Oil volume

According to the pressures p0 … p2, the gas volumes V0 … V2 will result.

In this process, V0 simultaneously is the nominal volume of the accumulator.

The available oil volume ΔV corresponds to the difference of the gas volumes V1 and V2:

ΔV ≦ V1 – V2   (3)

 

The gas volume variable within a pressure differential is determined by the following equations:

For an isothermal state change of gases, i.e. when the change of the gas cushion happens so slowly as to leave sufficient time for a complete thermal exchange between the nitrogen and its environment, therefore keeping the temperature constant, the following applies:p0 × V0 = p1 × V1 = p2 × V2   (4.1) For an adiabatic state change, i.e. a quick change of the gas cushion accompanied by a temperature change of the nitrogen, the following applies:p0 × Vχ0 = p1 × Vχ1 = p2 × Vχ2   (4.2)

 

χ = ratio of the specific gas heats (adiabatic exponent), for nitrogen = 1.4

 

In practice, state changes rather follow adiabatic laws. Often charging is isothermal and discharge is adiabatic.

Considering the equations (1) and (2), ΔV is between 50% and 70% of the nominal accumulator volume. The following applies as a guiding principle:

V0 = 1.5 … 3 × ΔV    (5)

 

Calculation diagram

For graphic determination, the formulas (4.1) and (4.2) are converted into diagrams. Depending on the task, the available oil volume, the accumulator size or the pressures can be determined.

 

Correction factor Ki and Ka

The equations (4.1) and (4.2) apply to ideal gases only.

The behavior of real gases, however, will show considerable variation at operating pressures above 200 bar which will have to be accounted for by correction factors. These can be taken from the following diagrams.

The correction factors the ideal sampling volume ΔV is to be multiplied with lie within a range of 0.6 … 1.

Application of the calculation diagrams

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litretechnical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litretechnical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Isothermal state changes p0 = 1 … 90 bar

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Isothermal state changes p0 = 100 … 300 bar

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Adiabatic state changes p0 = 1 … 90 bar

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Adiabatic state changes p0 = 100 … 300 bar

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Applications

Various applications exist for hydro-pneumatic accumulators:

▶ Energy storage in order to save pump drive power in intermittent operation systems.

▶ Energy reserve for emergencies, e.g. upon failure of the hydraulic pump.

▶ Compensation of leakage losses.

▶ Impact and vibration absorption in case of periodic vibrations.

▶ Volume compensation in case of pressure and temperature changes.

 

Mode of operation

Fluids are almost incompressible and therefore cannot store pressure energy. Hydro-pneumatic Rexroth accumulators use the compressibility of a gas for fluid storage. Exclusively use nitrogen of cleanliness class 4.0!

N2 = 99.99 vol. %

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Nominal capacity

Ordering code/type

h

Ød

a

b

Øe

Øf

Øg

SW

Weight

l

mm

mm

mm

mm

mm

mm

mm

kg

1 HAB1-330-6X/...G05G... 320.5 ‒ 354.5 112.5 ‒ 115.5 65 ± 3 mm 715 ± 3 mm
-
G3/4 52.4 23 H7
 
50 7
HAB1-350-6X/...G05G... 320.5 ‒ 354.5 112.5 ‒ 115.5 65 ± 3 mm 715 ± 3 mm
-
G3/4 52.4 23 H7
 
50 7
2.5 HAB2,5-330-6X/...G07G... 520.5 ‒ 562.5 112.5 ‒ 115.5 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 10
HAB2,5-350-6X/...G07G... 520.5 ‒ 562.5 112.5 ‒ 115.5 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 10
4 HAB4-330-6X/...G07G... 400.5 ‒ 442.5 166.3 ‒ 169.7 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 16.5
HAB4-350-6X/...G07G... 400.5 ‒ 442.5 166.3 ‒ 169.7 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 16.5
6 HAB6-330-6X/...G07G... 535.5 ‒ 569.5 166.3 ‒ 169.7 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 20
HAB6-350-6X/...G07G... 535.5 ‒ 569.5 166.3 ‒ 169.7 65 ± 3 mm 715 ± 3 mm
-
G1 1/4 52.4 36 H8
 
50 20
10 HAB10-330-6X/...G09G... 559 ‒ 591 216.8 ‒ 221.2 101.5 ± 3 mm 715 ± 3 mm
-
G2 76 54 H7
 
70 32
20 HAB20-330-6X/...G09G... 869 ‒ 901 216.8 ‒ 221.2 101.5 ± 3 mm 715 ± 3 mm
-
G2 76 54 H7
 
70 53
24 HAB24-330-6X/...G09G... 1,004 ‒ 1,036 216.8 ‒ 221.2 101.5 ± 3 mm 715 ± 3 mm
-
G2 76 54 H7
 
70 61
32 HAB32-330-6X/...G09G... 1,389 ‒ 1,421 216.8 ‒ 221.2 101.5 ± 3 mm 715 ± 3 mm
-
G2 76 54 H7
 
70 85
50 HAB50-330-6X/...G09G... 1,904 ‒ 1,936 216.8 ‒ 221.2 101.5 ± 3 mm 715 ± 3 mm
-
G2 76 54 H7
 
70 123

Project planning information

Bladder-type accumulators have to be safely and permanently fastened to the machine or system using mounting elements. The fastening is intended to keep the oil port tension-free. Particularly, no tension forces or static or dynamic inertia forces should be applied to the oil port.

Thermal expansion of the supporting structure and vibrations originating from the environment should be considered in the selection of suitable mounting points.

HAB mounting elements

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

1

Clamp

2

Console

3

Rubber support ring

Clamp type

Material number

Accumulator size

1

4

 

20

 

2,5

6

10

24

 

 

 

 

35

50

Clamp

110-120

1531316021

1

Clamp

160-170

1531316022

2

Clamp

218-228

1531316026

1

2

Clamp

224-230

1531316005

2

Console

1531334008

1

1

1

Rubber support ring

1530221042

1

1

1

Console and rubber support ring

Console (material number: 1531334008)
Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Rubber support ring (material number: 1530221042)
Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Mounting clamps

Type F1
Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Mounting clamps

Type F2
Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Clamp type

A

B

C

⌀D

E

H

K

M

S

Material number

mm

mm

mm

mm

mm

mm

mm

mm

Clamp 110-120 F1 135 96 150 110 ‒ 120 50 64 ‒ 69 - M8 3 1531316021
Clamp 160-170 F1 237 147 200 160 ‒ 170 50 90 ‒ 95 - M8 4 1531316022
Clamp 218-228 F1 237 147 258 218 ‒ 228 50 120 ‒ 125 - M8 4 1531316026
Clamp 224-230 F2 254 212 244 224 ‒ 230 50 120 ‒ 123 295 M12 3 1531316005

Charging and test device

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Test case

Material number

for bladder-type accumulator (HAB)

0538103011

Case (wihout contents)

R901079781

Charging and test valve HAB

0538103005

Pressure gauge 0 … 250 bar

1537231001

Hose l = 2.5 m with adapter piece form "D"

1530712005

for bladder and diaphragm accumulator (HAB/HAD)

0538103014

Components as above plus filling and test valve HAD

0538103006

Accessory parts to be ordered separately

Material number

Pressure gauge 0 … 25 bar

R900033955

Pressure gauge 0 … 60 bar

1537231002

Pressure gauge 0 … 400 bar

1537231005

Adapter piece

Form "F"

1533391010

Form "GB"

1533391011

Form "USA"

1533391012

Form "KR"

1533391013

Form "J"

1533391014

Form "RUS"

1533391015

Hose l = 5 m with transition socket form “D”

1530712006

Dimensions of charging and test valve

1 valve body with check valve, discharge valve, pressure gauge connection, and gas hose connection.

Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

1

Spare part, Material no. 1 537 410 065

2

Adapter see "Adapter from nitrogen bottle..."

Adapter for nitrogen bottle to cap nut
Dimensions in mm

Material no. 1533391010

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. 1533391013

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. R900034782

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. 1533391011

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. R900216133

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. R900708208

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. 1533391012

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. 1533391015

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Material no. R901070776

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Country

Material number

1​533391010

1​533391011

1​533391012

1​533391013

R900216133

1​533391015

R900034782

R900708208

R901070776

Brazil

x

Bulgaria

x

China

x

France

x

Greece

x

Great Britain

x

India

x

Italy

x

Japan

x

Canada

x

Korea North

x

Korea South

x

Malaysia

x

Mexico

x

Romania

x

Russia

x

Spain

x

Saudi Arabia

x

Singapore

x

Taiwan

x

Turkey

x

USA

x

Other countries on request.

Accumulator adapter for accumulator shut-off blocks type ABZSS

Please select the matching type according to data sheet 50131.

Fig. 2
Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Accumulator shut-off block

Accumulator type

Accumulator DN

Accumulator adapter

D

ØD2

H1

H2

M

O

O1

S

ABZSS10, ABZSS20

ABZSS08

ABZSS10, ABZSS20

ABZSS08

ABZSS10, ABZSS20

ABZSS08

ABZSS10, ABZSS20

ABZSS08

ABZSS10, ABZSS20

ABZSS08

ABZSS10, ABZSS20

ABZSS08

mm

mm

mm

mm

mm

mm

ABZSS08
ABZSS10
ABZSS20
Bladder-type accumulator Data sheet 50171 1 S10 S105 G3/4A 39.9 35 28 15.5 15.5 M33 x 2 M20 x 1.5 29.7 x 2.8 24 x 2 18 x 2.5 SW41 SW36
2.5 S12 S107 G1 1/4A 37 16.5 17.5 30 x 3 SW46 SW46
4
6
10 S13 S109 G2A 43 20.5 18.5 48 x 3 SW65 SW65
20
35
50

Adapter to metric thread

(HAB..–1X to HAB..–4X and –6X)

Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Nominal capacity

ISO 228

H

L2

ØD3

ØD4

SW

D2

MA

D1

MA

l

Nm

Tolerance

Nm

Nm

Tolerance

Nm

mm

mm

mm

mm

mm

1 G3/4 180 + 18
0
M30 x 1.5 180 + 18
0
32 28 46 12 41
2.5 ... 6 G1/14 450 + 45
0
M40 x 1.5 400 + 40
0
43 37 60 20 55
10 ... 50 G2 500 + 50
0
M50 x 1.5 450 + 45
0
41 44 78 32 70

Adapter for reduction of pipe connection

Dimensions in mm

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Nominal capacity

ISO 228

H

L2

ØD3

ØD4

SW

D2

MA

D1

MA

l

Nm

Tolerance

Nm

Nm

Tolerance

Nm

mm

mm

mm

mm

mm

1 G3/4 180 + 18
0
G3/8 70 + 7
0
8 28 38 12 32
2.5 ... 6 G1/14 450 + 45
0
G1/2 115 + 12
0
8 37 60 24 55
2.5 ... 6 G1/14 450 + 45
0
G3/4 180 + 18
0
8 37 60 24 55
10 ... 50 G2 500 + 50
0
G1/2 115 + 12
0
20 44 75 30 65
10 ... 50 G2 500 + 50
0
G3/4 180 + 18
0
20 44 75 30 65
10 ... 50 G2 500 + 50
0
- 310 + 31
0
20 44 75 30 65
10 ... 50 G2 500 + 50
0
G1 1/2 450 + 45
0
40 44 75 32 65

Pressure monitoring

Adapter for pressure gauge, material number 1535400171

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Gas valve

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Spare part kit for gas valve

Material number

R901438300

Components

Quantity

1

Protective cap

1

2

Sealing cap series 60

1

3

Valve insert series 60

1

4

Gas valve series 60

1

5

O-ring

1

6

Nut

1

Spare parts

technical illustration-HAB4-350-6X/150G07G-2N111-CE-Bladder-type accumulators -6X:  4 Litre

Seal kit (position 1 … 4)

Accumulator size

Material number

Material number

NBR, HNBR, ECO

FKM

l

1 R901441920 -
2.5 ... 6 R901441921 -
10 ... 50 R901441922 R901441923

Accumulator size

10

Spare bladder with gas valve and seal kit

20

Holding ring

30

Oil valve kit consisting of holding ring and oil valve

Material number

Material number

NBR

ECO

FKM

HNBR

NBR, HNBR, ECO

FKM

 

l

1 R901437540 - - R901438250 R901438280 R901438290 -
2.5 R901437541 - - R901438251 R901438280 R901438290 -
4 R901437542 R901438234 - R901438252 R901438280 R901438290 R901438270
6 R901437543 - - R901438253 R901438280 R901438290 R901438270
10 R901437544 R901438235 R901438240 R901438254 R901438281 R901438291 R901438271
20 R901437545 - R901438241 R901438255 R901438281 R901438291 R901438271
24 R901437546 - - R901438256 R901438281 R901438291 R901438271
32 R901437547 R901438236 R901438242 R901438257 R901438281 R901438291 R901438271
50 R901437548 - R901438243 R901438258 R901438281 R901438291 R901438271

Important notices

Intended use

Rexroth bladder-type accumulators type HAB..-6X are intended for the set-up of hydraulic drive systems in stationary mechanical engineering and plant construction.

In mobile applications or applications in which acceleration forces are applied to the bladder-type accumulator during intended use, its use is permitted only following release by the competent Rexroth product manager. Please contact technical sales for this.

Rexroth bladder-type accumulators type HAB..-6X are not intended for private use.

 

Safety instructions for hydraulic accumulators

For the hydraulic accumulator type HAB..-6X, observe the operating instructions 50171-B. The machine end-user will have sole responsibility for compliance.

General notices for hydraulic accumulators in hydraulic system can be found in ISO 4413.

Keep all documents included in the delivery in a safe place; they will be required by the expert in recurring tests.

 

Legal provisions

Hydraulic accumulators are pressure vessels and subject to the application national provisions and/or regulations valid at the place of installation.

In Germany, the Ordinance on Industrial Safety and Health (BetrSichV) applies.

Special regulations are to be observed in shipbuilding, aircraft construction, mining, etc.

 

Authorized persons

According to Ordinance on Industrial Safety and Health (BetrSichV), only authorized persons may carry out tests.

Authorized persons are such persons having obtained the required expert knowledge through professional training, experience and recent professional activity.

 

Safety equipment

Notice:

Hydraulic accumulators have to be secured against operation outside of the admissible limits according to Pressure Equipment Directive 2014/68/EU.

In order not to exceed the maximum operating pressure, we recommend the use of an accumulator shut-off block type ABZSS according to data sheet 50131.