Local Solutions for Individual Customers Worldwide - Oil Solutions

STAUFF 

Accumulators and Accessories 

Local Solutions for 

Individual Customers 

Worldwide

Walter Stauffenberg GmbH & Co. KG 

P.O.Box 1745 · D-58777 Werdohl 

Im Ehrenfeld 4 · D-58791 Werdohl 

Tel. : + 49 (0) 2392 916-0 

Fax: + 49 (0) 2392 2505 

e-mail: sales@stauff.com 

Internet: http://www.stauff.com 

Australia: 

Stauff Corporation (Pty.) Ltd. 

P.O. Box 227 

24-26 Doyle Avenue, Unanderra 

Wollongong, N.S.W. 

AUS-2526 Unanderra 

Tel. : + 61 2 42 71 18 77 

Fax: + 61 2 42 71 84 32 

Brazil: 

Stauff Brasil Ltda. 

Avenida Gupe 10.767 

Galpa˜ o 2, Bloco A 

WT – Empresarial Parque Castello Branco 

BRA-Barueri – SP 

CEP: 06422-120 

Tel: +55 1147899020 

Fax: +55 1147899021 

China: 

Stauff International Trading (Shanghai) Co., Ltd. 

Shangdian Mansion, Pudong 

331, Binzhou Road 

CHN-200126 Shanghai 

Tel. : + 86 21 58 45 65 60 

Fax: + 86 21 58 45 66 80 

France: 

Stauff s.a. 

230, Avenue du Grain d’Or 

Z.I. de Vineuil-Blois Sud 

F-41354 Vineuil-cedex 

Tel. : + 33 2 54 50 55 50 

Fax: + 33 2 54 42 29 19 

India: 

Stauff India Pvt. Ltd. 

Gat. No. 2340 

Pune-Nagar Road, Wagholi 

IND-Pune - 412207 

Tel. : + 91 20 705 19 90 

Fax: + 91 20 705 19 89 

Italy: 

Stauff Italia s.r.l. 

Via Pola 21/23 

I-20034 Birone di Giussano 

Tel. : + 39 0362 31 21 13 

Fax: + 39 0362 33 55 36 

Japan: 

Ohtsuka Tec. Co. Ltd. 

1-7-19 Minami Shinagawa 

Shinagawa-Ku 

JPN-Tokyo 140 

Tel. : + 81 3 34 72 12 01 

Fax: + 81 3 34 72 12 09 

Canada: 

Stauff Canada Ltd. 

866 Milner Avenue 

CAN-Scarborough, Ontario M1B 5N7 

Tel. : + 1 416 282 46 08 

Fax: + 1 416 282 30 39 

USA: 

Stauff Corporation 

7 Wm. Demarest Place 

USA-Waldwick, N.J. - 07463 

Tel. : + 1 201 444 78 00 

Fax: + 1 201 444 78 52 

United Kingdom: 

Stauff UK 

332, Coleford Road 

Darnall 

GBR-Sheffield, S 9 5 P H 

Tel. : + 44 1142 518 518 

Fax: + 44 1142 518 519 

2 

Distributor 

Oil Solutions 

PO Box 653 Castlemaine 3450 

Phone 0421 336 009 

Fax 03 9012 4332 

sales@oilsolutions.com.au 

www.oilsolutions.com.au 

Stauff Hydraulic Accessories 

Breathers 

Diffusers 

Flow Indicators 

Level Gauges 

Pressure Gauges 

Spin On Filters 

Suction Strainers 

Valves 

The STAUFF hydraulic accessories program has been 

carefully designed to offer a range of components suited to the 

demands of building hydraulic systems in most industrial and 

mobile applications. 

Whether you require simple filler breathers or precise electrical 

level switches, flow control valves or complete filter units; the 

STAUFF accessories range should provide you with the choice 

you need. 

At Stauff we are aware of the ongoing development and 

innovation within the hydraulic industry. We strive to keep up 

with and further develop the latest technology and to bring the 

benefit of any such improvements directly to the customer. 

Additionally we are always prepared to consider custom built 

products, if you have a special need. 

We ensure that your most urgent requirements are met by 

keeping a large and comprehensive stock in Australia 

These products are subject at all times to our DIN ISO 9001 

Quality Management Systems.

CONTENTS 

2 


PAGE 

Introduction .......................................................................................................................................3 

Material Options & Features ..........................................................................................................4,5 

Bladder Accumulators - STBA - 

Dimensions .......................................................................................................................................6 

Ordering Codes ................................................................................................................................7 

Diaphragm Accumulators - STDA - 

Dimensions .......................................................................................................................................8 


Safety Blocks - STASB - 

General Information and Ordering Code ........................................................................................10 

Bladders - STB - 

Dimensions ..................................................................................................................................... 11 


Anti-Extrusion Rings (AER) ............................................................................................................ 11 

Accessories 

Accumulator Adaptors ....................................................................................................................10 

Clamps and Brackets .....................................................................................................................12 

Charging Kit ....................................................................................................................................13 

Services and Sizing 

Precharging Procedure ..................................................................................................................14 

Maintenance, Disassembly and Reassembly .....................................................................15, 16, 17 

Accumulators Sizing Table for Storage Applications ......................................................................18

Introduction 


Accumulators provide a means of regulating the performance of a hydraulic system. They are suitable for storing 

energy under pressure, absorbing hydraulic shock, dampening pump pulsation and fl ow fl uctuations. Bladder or 

diaphragm accumulators provide excellent gas and fl uid separation ensuring dependable performance, maximum 

effi ciency, and long service life. 

Why use an Accumulator? 

• Improves your system effi ciency • Accepted world wide 

• Supplements your pump fl ow • High/ low temperature tolerance 

• Supplies extra power in an emergency • Extremely safe (cannot be disassembled under pressure) 

• Compensates for any system leakage • Quick response 

• Absorbs hydraulic shocks • Wide range of compounds for a variety of fl uids 

Accumulator Function 

The design of the Stauff accumulator makes use of the difference in the compressibility between a gas (nitrogen) and 

a liquid (hydraulic fl uids). The bladder contained in the shell is pre-charged with nitrogen gas to a pressure determined 

by the system pressure. 

After pre-charging, the work can be split into three steps. 

Step 1. When the hydraulic fl uid enters the accumulator, the nitrogen contained in the bladder is compressed and 

its pressure is increased. 

Step 2. The compression of the bladder stops when the pressure of the fl uid and nitrogen are equal (balanced). 

During this step the bladder is not subject to any abnormal mechanical stress. 

Step 3. On demand, as system pressure falls, the accumulator’s stored fl uid is returned to the system under 

pressure applied by the compressed nitrogen. On completion of the hydraulic system functions, the 

accumulator reverts to step 1. 

3

Material Options and Features 

4 

Main 

Components 

Shell 

Bladder 

Oil Port 

Assembly 


Standard 

Material 

• Chrome - Molybdenum 

Alloy Steel, (SA372) 

• All Sizes Comply with 

AS1210 Materials 

Specifi cations 

• Low temperature Buna-N 

(NBR) 

Material 

Options 

Consult Stauff 

Viton - (V) 

EPR - (E) 

Hi-Temp Buna (HBR) 

Consult Stauff for 

other options 

• AISI 4130 material spec. Consult Stauff 

Bladder Accumulator Features Maximum Flow Rates 

• Meets AS1210 and AS4343 specifi cations 

• 4 –1 design factor at normal operating pressures. 

• Also available with foreign certifi cates (upon request) 

• Interchangeable with most competitor’s units. 

• All standard accumulators available from stock. 

Features 

• Seamless shell construction 

• Documentation to AS4343 

provided 

• Available with Foreign 

or Domestic Certifi cates 

(Consult Stauff) 

• 1 piece fully enclosed 

moulded bladder 

• With moulded steel valve 

stems 

• Wide range of operating 

temperatures 

• Proven design and reliability 

• Port options available, refer 

to ordering code 

Size (litres) 

Max. Recommended Flow 

LPM 

1 & 2.5 336 

4 564 

10 - 57 1176

Material Options and Features 

5 

1. Shell 

Bladder accumulator shells are made from chromemolybdenum 

alloy steel (SA372) with forged ends 

for maximum strength. All sizes comply with AS1210 

material specifi cations, and documentation to AS4343 

are provided. 


2. Bladder 

Stauff bladders are manufactured from the most 

advanced elastomers which are capable of meeting 

a wide range of systems requirements. Bladders are 

offered in a variety of compounds to meet a, wide range 

of fl uids and operating temperatures. Standard material 

is low temperature Buna –N (NBR). 

3. Bladder Stems 

All bladder accumulators, sizes 4 litre and larger, are 

fi tted as standard with two-piece bladder stems with 

replaceable gas valve cartridge for ease of serviceability. 

4 

1 

2 

4. Port Assemblies 

Standard oil service ports are made from high-strength 

alloy steel for maximum durability. 

5. Fluid Ports 

BSPP(standard), NPT and Split Flange Adapters are 

available (See page 10). Bleeder ports (plugged) are 

included as standard on sizes 4 litre and larger. 

6. Gas Valve 

All accumulators are fi tted with a gas valve for ease of 

gas pre-charging. 4 litre and larger units are equipped 

with a cored gas valve cartridge 

(ISO-4570-8V1) for ease of maintenance. For safety, the 

gas valve will vent if unscrewed. 

6 

3 

5

6 


Stauff Bladder Accumulator Dimensions and Specifi cations 

Nominal 

Capacity 

(Litres) 

Max. 

W.P. 

(bar) 

Dimensions 

Net 

Weight 

A 

mm 

B 

mm 

C 

mm 

D 

BSPF 

F 

Bleed Plug 

Kg. 

1.1 400 117 321 55 G3/4” N/A 5.7 

2.5 400 118 522 54 G3/4” N/A 10 

4 345 168 446 65 G1 1/4” Hex 19 a/f 14 

10 210 222 585 103 G2” Hex 19 a/f 27 

20 210 222 891 103 G2” Hex 19 a/f 42 

25 210 222 1041 103 G2” Hex 19 a/f 55 

37 210 222 1428 103 G2” Hex 19 a/f 66 

50 210 222 1933 103 G2” Hex 19 a/f 92 

57 345 229 2003 103 G2” Hex 19 a/f 125


Stauff Bladder Accumulators Ordering Codes 

Model Code 

STBA - Stauff Bladder Accumulator 

STB - Bladder only 

Type 

O - Oil Service Bladder (Standard) 

W - Water Service Bladder (Optional) 

Other approvals on request 

Size 

Code 

Capacity 

Litres 

011 1.1 

025 2.5 

040 4 

10 10 

20 20 

25 25 

37 37 

50 50 

57 available in T style only 57 

Bladder Material 

NBR - Low Temp. Buna-N (Standard) 4 - 57L (-15 to 80˚C) 

HBR - High Temp Buna-N (Optional) (0 - 130˚C) 

V - Viton (Optional) (-20 to 140˚C) 

E - EPR (Optional) (-40 to 120˚C) 

Pressure Rating 

P3 - 3000 PSI / 210 Bar (Standard) 10 - 50L 

P5 - 5000 PSI / 345 Bar (Standard) 4 & 57L 

P6 - 6000 PSI / 400 Bar (Standard) 1.1 & 2.5L 

Fluid Port Connection 

B - BSPF Threaded (Std) 1.1 - 57L 

F - Code 62 Split Flange (Optional) 4 - 57L 

Available with Split Flange Adaptor ** 

** Not available on water service 

Style 

B - Bottom Repairable (Standard) 

T - Top Repairable (Optional) 

Design Code 

1 - Standard (Australian Standard) AS 1210 

* - Special design No. to be assigned 

STBA - O - 011 - HBR - P3 - B - B - 1 

STB - O - 011 - HBR 

7

8 

Part No. 


Stauff Diaphragm Accumulators Dimensions and Specifi cations 

• Non-repairable diaphragm accumulator 

• Compression ratio of 8:1 

• Electron beam welded steel shell 

• Standard nitrile rubber high strength diaphragm 

• European certifi cation - CE 

• Optional M28x1.5 gas connection 

Volume 

Litres 

Pressure 

Bar 

Charging 

Thread 

Connection 

Dimensions (mm) Weight 

kg 

A B C D 

STDA - 032 - NBR - P3 - B - N - 1 0.32 210 G1⁄4” G1⁄2” 168 20 32 95 1.8 

STDA - 050 - NBR - P3 - B - N - 1 0.5 210 G1⁄4” G1⁄2” 180 22 41 106 2.1 

STDA - 075 - NBR - P3 - B - N - 1 0.75 210 G1⁄4” G1⁄2” 197 22 41 123 3 

STDA - 100 - NBR - P1 - B - N - 1 1 200 G1⁄4” G1⁄2” 208 22 41 136 3.6 

* 

*New 1/4” BSP gas valve 

connection for easy use with 

Stauff charging kit #STA-CK-1


Stauff Diaphragm Accumulators Ordering Code 

Model Code 

STDA - Stauff Diaphragm Accumulator 

Size 

Code 

Capacity 

Litres 

032 0.32 

050 0.5 

075 0.75 

100 1 

Diaphragm Material 

NBR - Low temp Buna - N (Standard) -15 to 80˚C 

Pressure Rating 

P1 - 2900 PSI/200 Bar (Standard) 1L 

P3 - 3000 PSI/210 Bar(Standard) 0.32,0.5,0.75L 

Fluid Port Connection 

B - G1/2 BSPF (Standard) 

Style 

N - Non Repairable (Standard) 

Design Code 

1 - Standard (Certifi ed European - CE) 

* - Special design No. to be assigned 

STDA - 032 - NBR - P3 - B - N - 1 

9

Safety Blocks 

10 

P 

Stauff Code 


• Constructed from hi-tensile steel 

• Provides manual isolation (ball valve) of the accumulator from the circuit 

• Factory set pressure relief valve 

• Manual integrated valve for fl uid dump to tank 

• CETOP connection to circuit. BSPP male fl ange adaptor on accumulator side 

• Stauff Test 20 coupling supplied for sampling or pressure monitoring 

• Safety blocks are also available with an electric dump valve option (AC/DC). 

Price on application 

• A range of sealing materials available 

Bore 

mm 

Isolation 

Accumulator 

Connection 

Recommeded Series 

Weight 

kg 

STASB-NG*-M-1-7-350 16 manual BSPM 1 1/4” 4 litre - 350 bar 5.6 

STASB-NG*-M-1-7-210 24 manual BSPM 2” (10 to 50 litre) - 210 bar 12.1 

STASB-NG*-M-1-7-350 

* Available in sizes 10, 20 & 32 

24 manual BSPM 2” (10 to 57 litre) - 345 bar 12.1 

Accumulator Adaptors 

T 

Description Stauff Code 

2” BSPP Plug with O-Ring STAP-0-32 

Reducing Bush 2” BSPPM x 1/2” BSPPF STRB-32-08 

Reducing Bush 2” BSPPM x 3/4” BSPPF STRB-32-12 

Reducing Bush 2” BSPPM x 1” BSPPF STRB-32-16 

2” Bonded Washer ATB036 

1/2” Bonded Washer ATB025 

3/4” Bonded Washer ATB027 

1” Bonded Washer 

SAE Flange Inserts with Captive Seals 

ATB030 

1/2”SAE Code 61 x 1/2” BSPPM STFI-3-0808M 

1/2” SAE Code 62 x 1/2” BSPPM STFI-6-0808M 

3/4” SAE Code 61 x 3/4” BSPPM STFI-3-1212M 

3/4” SAE Code 62 x 3/4 “ BSPPM STFI-6-1212M 

11/4” SAE Code 62 x 11/4” BSPPM 

SAE Flanges 

STFI-6-2020M 

Code 61, 1/2” Split Flange Pair SFC308 

Code 61 , 3/4” Split Flange Pair SFC312 

Code 61 , 11/4 “ Split Flange Pair SFC320 

Code 61, 2” Split Flange Pair SFC332 

Code 62, 1/2” Split Flange Pair SFC608 

Code 62, 3/4” Split Flange Pair SFC 612 

Code 62, 11/4” Split Flange Pair SFC 620

Bladder Dimension Tables 


Stauff offer a wide range of bladder materials to suit most applications. Please consult Stauff for details of bladder 

compatibility, with fl uid and fl uid temperature. 

Table 1 gives the range of bladder materials available with their corresponding working temperature when handling 

non-aggressive fl uids. 

Table 2 can be used to distinguish bladder capacities by overall dimensions. For other bladder materials consult 

Stauff. 

H 

D 

Interchangeability 

Anti Extrusion Ring Assembly 

Table 1 

Stauff Code Bladder Material 

Temperature Range 

from ˚C to ˚C 

NBR Low Temperature Buna-N(Standard) -15 80 

HBR High Temperature Buna-N 0 130 

V Fluorocarbon(Viton) -20 140 

E Ethylene Propylene (EPR) -40 120 

Table 2 Bladder kit 

Accumulator 

Capacity (l) 

Nominal 

Dimension 

H mm 

Dimension 

D mm 

0.16 154 41 

0.6 132 73 

1.1 147 91 

2.5 335 100 

4.0 203 142 

10.0 283 198 

20.0 610 198 

37.0 1128 198 

50.0 1603 198 

57.0 1703 198 

Stauff bladders are fully interchangeable with common European brands. 

• Anti extrusion ring (AER) assembly includes the moulded anti extrusion 

ring with split ring, fl uid port (or top plug) O-ring and back-up ring 

& bleed plug bonded seal for 4 to 57 litre. 

• Oil service AER supplied in nitrile carbon steel split ring (standard). 

For water service, AER incorporates a stainless steel split ring. 

Stauff Part No. Accumulator Size 

Connection to 

Accumulator BSPM 

STB-AER-01 1.1, 2.5L G3/4” 

STB-AER-02 4L G1 1/4” 

STB-AER-03 10 - 57L G2” 

Always quote full Part No. e.g. 

STB-O-011-NBR, capacity, Nitrile 

Rubber, 1/4” BSP. 

The kit comprises of : 

- Bladder 

- Gas valve 

- Lock nut 

- Fluid port ‘O’-Ring 

- Back up ring 

- Protective Cap* 

- Bleed plug seal* 

*4L capacity and above only 

Anti-extrusion ring assembly supplied 

separately, refer below. 

11

Clamps and Brackets 

Saddle Clamps 

Support Brackets 

12 


• Saddle clamps manufactured from mild steel with zinc 

plated fi nish 

• Rubber strips are made from nitrile 

• Support brackets manufactured from mild steel with zinc 

plated fi nish 

• Cushion rings made from nitrile 

4 litre 

10 - 57 litre 

Saddle Clamps Stauff Part Number 

1 to 3 litre AMP114 

4 litre AMP170 

10 to 57 litre AMP228 

Support Brackets Stauff Part Number 

4 litre BB120R 

10 to 57 litre BB170R

Charging Kit #STA-CK-1 


To maintain optimum performance in hydraulic systems employing accumulators, it is recommended that the gas 

pre-charge pressure be checked regularly. A loss in the gas pre-charge pressure will cause a drop in the system 

effi ciency and may cause damage to the accumulator bladder, diaphragm or piston. 

The charging kit allows hydro-pneumatic accumulators, whether bladder type, diaphragm type or piston type, to be 

charged with nitrogen to the desired pressure. For this purpose, the kit is connected to a commercially available 

nitrogen cylinder by a fl exible hose. 

The kit can also be used by technicians to check the current gas pre-charge pressure. The control valve incorporates 

a pressure gauge to permit direct pressure readings as well as a check valve to prevent back fl ow in the case of 

low pressures in the nitrogen cylinder. A manual bleed valve allows excess pressure to be reduced to the desired 

operating pre-charge level. 

- Pressure gauge is a safety pattern type to AS1349-1986 

The kit has adaptors to connect the hose to the nitrogen cylinder as well as adaptors to connect the control valve to the 

accumulator. 

SAA 10143 SAA 50019 

SAAGAS531 SAA 50510 

Note: Pictures not to scale. 

● Other adaptors available upon request. 

Order Code Description 

STA -CK -1 

Comprising of: 

Accumulator Charge Kit 

SAA50019 0.302 x 32 TPI adaptor 

SAA10143 7.8” UNF adaptor 

SAA50510 ¼” ISO 228 adaptor 

SAAGAS531 Type 50 - ¼” BSPT bottle adaptor 

SAA2069 Valve 

SAA2069T Valve tool 

SAAPC2156/250 Charging/pre - loading/gauge set 

SMS20/M ¼-2000AGAS Hose assembly - 2m 

- Optional: 0-17000 kPa outlet nitrogen regulator. Code SAR017000 

- Stauff recommend the use of nitrogen gas only for 

pre-charging of accumulators. 

- Always wear protective safety glasses. 

SAA 2069 

SAA 2069T 

13

Precharging Procedure 

General Information 

14 


• Prior to commissioning a hydraulic system, any accumulators in the system should have their pre-charge 

pressure checked and adjusted. 

• The condition of the accumulator is primarily determined by periodic checking of the pre-charge pressure. 

• Hydraulic Accumulators are pressure vessels and only qualifi ed personnel should perform maintenance. 

• Drain all fl uid completely from accumulator before performing any maintenance. 

• DO NOT weld or braze directly on accumulator shell. 

• DO NOT use automotive type valve cores as high pressure accumulator gas valves. 

• The most accurate pre-charge readings can only be taken when fl uid pressure is at zero. 

• Always observe the maximum working pressure and operating temperature ranges. 

Pre-charging Bladder Accumulators 

A Isolate the accumulator from the system, open the drain valve and make sure hydraulic fl uid pressure is zero. 

B Remove gas valve protection cap and valve cap from the accumulator. 

C To charge the accumulator, use a charging hose and gauge assembly from the Stauff Charging Kit # STA-CK-1 

rated for 250 bar maximum. 

D Before using the charging assembly (Figure 1.) make sure that valve A is completely open (counter-clockwise), 

and that bleed valve B (Figure 1.) is closed. 

E Connect the charging unit to the gas fi ll valve on the accumulator by means of knurled cap D (Figure 1.). 

F Fit the gas bottle adaptor (included in Stauff charging kit) to the nitrogen bottle, make sure that the gas valve on 

the nitrogen bottle is closed (see Figure 2.) then attach gas hose to the gas bottle adaptor on the nitrogen bottle. 

G Connect the other end of gas hose to the Stauff test coupling C (Figure 1.), after taking off its cap. 

H Turn valve A (Figure 1.) clockwise to the point where resistance is felt or pressure is registered on the 

gauge(only if there is an existing pre-charge). 

I SLOWLY open valve on nitrogen bottle (Figure 2.) and allow the gas to fl ow to the accumulator. 

J When the pressure in the accumulator is slightly higher than is required, close the valve on the nitrogen bottle. 

K Open valve A (Figure 1.) (counter-clockwise) and reduce the pressure in the gas hose and charging assembly to 

zero by means of bleed valve B (Figure 1.). 

L Remove hose from non-return Stauff test coupling C (Figure 1.) and replace cap. 

M Close the bleed valve B (Figure 1.) and wait a few minutes for pressure to stabilise. 

N Screw valve A (Figure 1.) clockwise until pressure can be read on gauge. This should be slightly higher than the 

required pressure. 

O Adjust pressure by means of bleed valve B (Figure 1.), then unscrew valve A (Figure 1.), counterclockwise. 

Open valve B (fi gure 1) then remove charging unit. 

P Replace gas valve cap and protective cap on accumulator. Accumulator is now ready for use. 

B 

A 

D 

C 

- Safety pattern gauge. 

Figure 1 Figure 2 

NOTE: Allow accumulator to rest about 10-15 minutes after gas pre-charging. This will allow gas temperature to adjust 

and equalize. Recheck gas pre-charge pressure and adjust if necessary. Check accumulator gas valve for any leaks 

with soapy water. Always wear safety glasses.

Maintenance 


General Information 

The condition of the accumulator is primarily determined by periodic checking of gas pre-charge pressure. Only 

qualifi ed personnel should perform any maintenance on accumulators. Nitrogen gas pre-charge pressure should 

be checked at least once during the fi rst week of operation to ensure that no leak has developed. The pre-charge 

pressure and ambient temperature should be recorded at installation and checking done at the same temperature if 

possible. If there is no loss of gas pre-charge pressure, it should be rechecked in approximately 4 months. Thereafter, 

it should be checked annually. Check pre-charge if the system is acting sluggishly. If pre-charge is low, check gas 

valve for leakage and recharge. 

Bladder Accumulators 

1 Use appropriate valving in the hydraulic system to discharge all hydraulic fl uid from accumulator. 

2 To check or adjust pre-charge pressure, HYDRAULIC PRESSURE MUST BE REDUCED TO ZERO. 

Pre-charge pressure should be checked periodically. 

3 Charging and checking should be done with an accumulator charge kit similar to Stauff Part # STA-CK-1. 

4 Remove gas valve protection cap and valve cap as per pre-charge procedure instructions (B) on page 14 

5 Attach gauge assembly to accumulator gas valve. 

6 Make sure bleed valve B (Figure 1.) is closed, depress gas valve core gently by turning valve A (Figure 1.) 

clockwise. Gas pressure can now be read on gauge. 

7 To reduce pressure, open bleed valve B (Figure 1.) carefully, allowing gas to escape until desired pressure is 

obtained. It the pre-charging pressure is less than required, refer to the pre-charging procedure on page 14 

B 

A 

Figure 1 

D 

C 

- Safety pattern gauge. 

NOTE: Allow accumulator to rest about 10-15 minutes after gas pre-charging. This will allow gas temperature 

to adjust and equalize. Recheck gas pressure and adjust if necessary. Check accumulator gas valve for any 

leaks with soapy water. 

The kit has adaptors to connect the hose to the nitrogen cylinder as well as adaptors to connect 

the charging/pre-loading/gauge set to the accumulator. 

- Stauff recommend the use of nitrogen gas only for 

pre-charging of accumulators. 

- Always wear protective safety glasses. 

15

Disassembly Instructions 

Bladder Type 

Remove protective cap 

Remove complete gas valve 

or gas valve core only 

Undo lock ring and remove 

fl ange washer 

Remove the fl uid port and 

bladder 

16 

1 

4 

7 

10 


NOTE: It is good practice to disassemble accumulators in a clean area 

to keep all parts free of foreign matter. 

Remove gas valve cap 

2 

5 

Remove locknut and metal label 

8 

Push fl uid port inside of shell 

and remove o-ring and back up 

ring 

Release nitrogen from the 

accumulator using Stauff 

charge kit #STA-CK-1 

Remove bleed plug 

(2 different models shown) 

3 

6 

9 

Squeeze the anti extrusion 

ring(AER) through the opening

Reassembly Instructions 

Bladder Type 

Neatly fold the bladder 

(logitudinally) and squeeze it 

inside the shell through the fl uid 

end. Locate the gas valve and 

push it through the opening at 

the gas end 

Pull the fl uid port through the 

AER. Assemble o-ring, backup 

ring, fl ange washer and locking 

ring (in that order) 

Tighten the bleed plug 

1 

4 

7 


NOTE: It is good practice to assemble accumulators in a clean area to 

keep all parts free of foreign matter. 

Remove the gas valve. 

Squeeze the bladder to 

discharge air from it. Lubricate 

the inside of the shell by turning 

it around on its axis. Use the 

process fl uid or similar liquid 

Ensure that the fl uid port is 

centred 

2 

5 

8 

Mount the metal plate. Tighten 

the locking nut (on the gas side) 

and fi t the gas valve or gas 

valve core 

Pace the fl uid port inside the 

shell (poppet fi rst). Fold and 

place it inside the shell so that 

metal components are located 

on the shell opening 

Tighten the locking ring 

3 

6 

NOTE: 

The steps outlined in the 

procedures above show the 

suggested sequence of events 

to carry out maintenance on 

accumulators utilising widely 

accepted general engineering 

fi tting practices and are not 

meant to be of a technical 

nature. 

These procedures may vary 

according to accumulator types 

17

Sizing Chart for Storage Applications 

Pressure 

Ratio 

P3/P1≤5 

Above volumes in litres discharged between P3/P2 

18 


The chart below is designed as a quick guide only for sizing of accumulators. It does not take into account actual 

isothermal or adiabatic conditions. For accurate system design requirements consult your Stauff Offi ce. 

STANDARD BLADDER ACCUMULATORS 

BLADDER ACCUMULATORS 

P3/P2 OB OF 11 O3 O4 10 20 28 37 50/54 57 

TRANSFER BARRIER WITH 50L GAS 

BACK-UP BOTTLE (BUB) FITTED 

28+ 1 

BUB 

37+ 1 

BUB 

37+ 2 

BUB 

54+ 1 

BUB 

54+ 1 

BUB P3/P2 

1.05 0.005 0.018 0.035 0.08 0.12 0.29 0.57 0.78 1.07 1.49 1.6 2.2 2.46 3.87 2.87 4.28 1.05 

1.10 0.01 0.035 0.066 0.14 0.22 0.34 1.09 1.49 2.03 2.84 3.03 4.18 4.69 7.37 5.49 8.16 1.1 

1.15 0.015 0.049 0.094 0.21 0.31 0.78 1.55 2.12 2.9 4.04 4.31 5.96 6.73 10.56 7.88 11.73 1.15 

1.20 0.019 0.063 0.12 0.26 0.39 0.98 1.97 2.69 3.68 5.13 5.48 7.58 8.6 10.06 14.97 1.2 

1.25 0.022 0.074 0.143 0.31 0.47 1.17 2.35 3.2 4.39 6.12 6.53 9.06 10.2 11.94 17.76 1.25 

1.30 0.026 0.086 0.149 0.36 0.54 1.35 2.69 3.68 5.03 7.02 7.49 11.91 13.94 1.3 

1.35 0.029 0.096 0.183 0.4 0.6 1.5 3.01 4.11 5.62 7.84 8.37 13.11 15.35 1.35 

1.40 0.032 0.104 0.201 0.44 0.66 1.65 3.29 4.51 6.16 8.6 9.17 16.77 1.4 

1.45 0.034 0.113 0.217 0.47 0.71 1.78 3.56 4.87 6.65 9.28 9.9 18.09 

1.50 0.036 0.121 0.231 0.5 0.76 1.9 3.8 5.2 7.11 9.98 10.58 19.33 

1.55 0.038 0.128 0.245 0.53 0.81 2.01 4.03 5.51 7.53 10.5 11.2 Above volumes in litres dischrged between P3/P2 

1.60 0.041 0.135 0.258 0.56 0.85 2.12 4.23 5.79 7.89 11.04 11.78 

HOW TO USE CHART ABOVE 

1.65 0.042 0.141 0.27 0.59 0.89 2.21 4.43 6.05 8.27 11.54 12.31 

1.70 0.044 0.146 0.28 0.61 0.92 2.3 4.6 6.3 8.6 12.01 12.81 

1. Use above chart in same way as left but 

limiting volume discharged to that shown, so 

1.75 

1.80 

0.046 

0.047 

0.152 

0.157 

0.29 

0.3 

0.63 

0.65 

0.95 

0.98 

2.38 

2.46 

4.77 

4.92 

6.52 

6.73 

8.91 

9.2 

12.44 

12.84 

13.27 

13.7 

that V1-V3 does not exceed 0.80 of actual 

accumulator shell volume. 

The corresponding pressure ratio is seen 

1.85 0.048 0.161 0.31 0.67 1 2.53 5.06 6.93 9.47 13.21 14.09 

under P3/P2 column. 

1.90 0.049 0.165 0.32 0.69 1.04 2.6 5.2 7.11 9.71 13.56 14.46 HOW TO USE THE CHART LEFT 

1.95 0.051 0.169 0.325 0.71 1.06 2.66 5.32 7.28 9.95 13.88 14.81 

Problem: What Size of Accumulator will 

2.00 0.052 0.173 0.331 0.72 1.09 2.72 5.44 7.44 10.17 14.19 15.14 discharge 1.4L of liquid between 140bar and 

2.10 0.054 0.179 0.344 0.75 1.13 2.83 5.65 7.73 10.56 14.74 15.72 

120bar. 

2.20 0.056 0.186 0.355 0.77 1.17 2.92 5.84 7.98 10.91 15.23 16.24 

140 

1. P3/P2 = 1.17 

120 

2.30 0.057 0.191 0.365 0.8 1.2 3 6 8.21 11.22 15.66 16.7 2. Find the value of P3/P2 which is equal 

2.40 

2.50 

0.059 

0.06 

0.195 

0.2 

0.374 

0.382 

0.82 

0.83 

1.23 

1.26 

3.07 

3.14 

6.18 

6.28 

8.41 

8.58 

11.49 

11.74 

16.04 

16.38 

17.11 

17.47 

to or next lowest to 1.17. In this case the 

value is 1.15. 

3. Select accumulator reference equal to or 

2.60 0.061 0.203 0.389 0.85 1.28 3.2 6.39 8.74 11.95 16.68 17.79 next greater to 1.4L from the values located 

in the row 1.15 i.e. 1.55 Project upwards 

2.70 0.062 0.207 0.395 0.86 1.3 3.25 6.5 8.88 12.15 16.95 18.07 and read off accumulator reference i.e. 20. 

2.80 0.063 0.21 0.401 0.87 1.32 3.29 6.59 9.01 12.32 17.19 18.33 

NOTES 

2.90 0.064 0.212 0.406 0.88 1.34 3.34 6.67 9.12 12.42 17.41 18.56 

3.00 0.065 0.215 0.411 0.89 1.35 3.37 6.75 9.22 12.61 17.6 18.77 

P3 = Maximum system pressure 

P2 = Minimum permitted system pressure 

3.20 0.066 0.219 0.419 0.91 1.38 3.44 6.88 9.4 12.85 17.94 19.12 P1 = 90% of P2 

3.40 0.067 0.222 0.425 0.92 1.4 3.49 6.98 9.54 13.04 18.2 19.41 

Volumes delivered based on 

P1V1 = P3V3 = Isothermal Compression 

3.60 

3.80 

0.068 

0.069 

0.224 

0.227 

0.43 

0.434 

0.94 

0.95 

1.41 

1.43 

3.53 

3.57 

7.06 

7.13 

9.65 

9.75 

13.2 

13.33 

18.42 

18.6 

19.64 

19.83 

P3V3n = P2V2n = Adiabatic Expansion 

where n = 1.4 

4.00 0.07 0.228 0.437 0.96 1.44 3.59 7.18 9.82 13.43 18.74 19.98 

4.50 0.075 0.231 0.443 0.97 1.46 3.64 7.28 9.45 13.61 18.98 20.24

NOTES 


19

STAUFF 

Australia 

HEAD OFFICE 

SYDNEY 

MELBOURNE 

24 - 26 Doyle Avenue 

27B Davis Road 

3B 14 - 16 White Street 

UNANDERRA NSW 2526 

WETHERILL PARK 

OAKLEIGH EAST VIC 3166 

P.O.Box 227 

NSW 2164 

P.O. Box 453 


P.O. Box 7180 

MULGRAVE VIC 3170 

Ph: (02) 4271 1877 

WETHERILL PARK DC 

Ph: (03) 9543 5411 

Fax: (02) 4271 8432 

NSW 2164 

Fax: (03) 9543 5422 

E-mail: info@stauff.com.au 

Ph: (02) 9725 2733 

http://www.stauff.com.au 

Fax: (02) 9725 2744 

BRISBANE 

ADELAIDE 

463 Boundary Road 

1/3 Endeavour Drive 

RICHLANDS QLD 4077 

PORT ADELAIDE SA 5015 

P.O. Box 20 

P.O. Box 208 



Ph: (07) 3217 0444 

Ph: (08) 8341 2260 

Fax: (07) 3217 0300 

Fax: (08) 8341 1604 

New Zealand 

AUCKLAND 

Unit D 103 Harris Road 

EAST TAMAKI 

P.O. Box 58517 

GREENMOUNT 

Ph: (09) 271 4812 

Fax: (09) 271 4832 

E-mail: sales@stauff.co.nz 

http://www.stauff.com 

Distributed by: 

STA-AAA-0505AUS E & OE

Quality 

Endorsed 

Company 

ISO 9002 Lic 3765 

Standards Australia 

In-line 

FLOW MONITORS 

& 

CONTROLLERS 

Quality and Service 

worldwide

A 

In-Line Flow Monitors 

Stauff’s “FLOWTELL” in-line flow monitors and controllers offer a range of rugged flow rate gauges that 

are accurate and economical and are the perfect instruments for fixed in-line monitoring or for use as 

service tools for system commissioning. 

“FLOWTELL” employs the well-established and reliable ‘variable area orifice’ measurement method 

together with a unique ‘sharp edge technology’ that ensures low pressure drops and high tolerance 

levels to changes in viscosity, resulting in repeatable flow rate measurements for both liquids and gases. 

The product range is suitable for measuring Hydraulic Oils, Water and Air or Gas mediums and includes 

models for Phosphate Ester. A special range is also available for High Temperature applications. 

“FLOWTELL”’ is also available with the option of field-adjustable single or twin switches for High and 

Low flow rate alarms, or as a Transmitter giving a 4 - 20mA signal for system control capability. 

To suit varying system demands, “FLOWTELL” monitors are available in a choice of materials comprising 

Aluminium, Brass or Stainless Steel with wetted parts materials to suit the fluid type. 

“FLOWTELL” is capable of working in any plane and is read against the Dual Scale on the outer sleeve 

by the external magnetically coupled non-invasive annular cursor. 

PERFORMANCE SPECIFICATIONS 

Measuring Accuracy: better than 4% Full Scale 

Repeatability: 1% of Full Scale 

Flow Range: Fluids 0.5 to 550 l/min (0.05 to 150 GPM) 

Gases 1.5 to1300 scfm (0.5 to 600 l/sec) 

Normal Viscosity Range: 1 to 150 cSt (mm 2 /sec) 

Working Pressures: Alu. & Brass 240 bar 

St. Steel 410 bar 

Temperature Range: Standard 116°C 

High Temp. 204°C (Ultra high on request - 315°C) 

Pressure Differentials: Refer to ∆P graphs on Page 3 

Standard Calibration: Oil: 40 cSt and 0.873 SG 

Water: tap water at 20°C and 1.0 SG 

Gas: air at 21°C and 7 bar 

Enclosure Rating: IP 65 

Electric Specifications: 

Flow Rate Alarm SPDT switch 10A 250VAC 

0.5A 125VDC 

0.25A 250VDC 

3A 125VAC bulb load 

Flow Rate Transmitter Power 12 - 35 VDC 

Output4 - 20mA, 0 -5 VDC, 1 - 5 VDC 

Over-current protection self-limiting at 35mA 

Resolution 10bit (0.1%) 

Isolation Inherently isolated from the process 

Response Time < 100 milliseconds 

2

Part Number Build for Ordering 

∆P - bar 

∆P - bar 

1.0 

0.8 

0.6 

0.4 

0.2 

0 

2.0 

1.75 

1.5 

1.25 

1.0 

0.75 

0.5 

0.25 

Port Sizes 3/8", 1/2" 

1 

7.5 

1 2 


Type Material Pressure Fluid Port Size Scale 

FT B A 6 H 3 20 

2 

15 22.5 

5 

Type 

B Fluid Monitor 

G Gas Monitor 

H High Temp. 

M Single Switch 

N Twin Switch 

P Phosphate Est. 

R Transmitter 

Materials 

A Aluminium 

B Brass 

S Stainless Steel 

Pressure 

4 600psi (Gas, Alu. & Brass) 

5 1000psi (Gas, Stain. Steel) 

6 3500psi (Fluids, Alu. & Brass) 

7 6000psi (Fluids, Stain. Steel) 

Fluid Medium 

A Air / Gas 

H Oil / Hyd. Fluid 

W Water 

5 

30 37.5 45 52.5 

Flow Rate - l/min 

Port Sizes 3/8", 1/2" 

0 25 50 75 100 125 150 

Flow Rate - l/sec 

10 

10 

60 

∆∆∆∆∆P curves at 40cSt. – Fluid Monitors 

∆P - bar 

1.0 

0.82 

0.66 

0.5 

0.35 

0.18 

0 

Port Sizes 3/4", 1" 

20 

15 

38 75 115 150 


∆∆∆∆∆P curves at 7 bar. – Gas Monitors 

∆P - bar 

1.7 

1.5 

1.0 

0.5 

Port Sizes 3/4", 1" 

15 

20 

0 40 80 120 160 200 240 

Flow Rate l/sec 

3 

30 

25 

Scale Port Size Flow Range Flow Range 

BSPP Fluids Air 

25 

30 

40 

40 

GPM l/min SCFM l/sec 

01 3/8” 0.05 - 1 0.5 - 4 1.5 - 12 0.5 - 5.5 

02 3/8” 0.2 - 2 1 - 8 4 - 23 2 - 10 

05 1/2” 0.5 - 5 2 - 19 5 - 50 2.5 - 25 

10 1/2” 1 - 10 4 - 38 10 - 100 5 - 45 

15 3/4” 1 - 15 4 - 56 15 - 150 8 - 56 

20 3/4” 2 - 20 0 - 75 20 - 215 10 - 100 

25 3/4” 2 - 25 10 - 100 20 - 250 10 - 120 

30 1” 3 - 30 10 - 115 30 - 330 15 - 140 

40 1” 4 - 40 15 - 150 30 - 400 15 - 190 

50 1¼” 5 - 50 20 - 190 30 - 470 15 - 220 

75 1¼” 8 - 75 30 - 280 30 - 750 20 - 350 

88 1¼” 10 - 100 50 - 375 150 - 900 75 - 425 

99 1½” 20 - 150 10 - 550 150 - 1300 70 - 600 

∆P (bar) 

∆P - bar 

2.0 

1.73 

1.4 

1.0 

0.7 

Port Sizes 1¼", 1½" 

75 

0.35 

0 75 150 

50 

225 300 375 455 530 600 


2.0 

1.5 

1.0 

0.5 

0 

Port Sizes 

1 3/8” BSPP 

2 1/2” BSPP 

3 3/4” BSPP 

4 1” BSPP 

5 1¼” BSPP 

6 1½” BSPP 

Port Sizes 1¼", 1½" 

50 

75 

88 

88 

99 

A 

99 

100 200 300 400 500 600 

Flow Rate l/sec

PHYSICAL DETAILS 

Monitor Switch Alarm / Transmitter 

A 

D L 

Port Size “D” “L” 

3/8”, 1/2” 48 167 

3/4”, 1” 60 182 

1¼”,1½” 90 258 

MATERIAL SPECIFICATIONS 

Body Material 

L 

Port Size “L” “B” “W” “A” 

3/8”, 1/2” 167 101 56 47 

3/4”, 1” 182 114 75 47 

1¼”,1½” 258 135 47 47 

Aluminium Brass Stainless Steel 

Wetted Components 

Casing, Ports & Cone Aluminium Brass Stainless Steel 

Seals Buna-N Buna-N Viton with Teflon backup 

Transfer Magnet Teflon coated Alnico Teflon Coated Alnico Teflon Coated Alnico 

Floating Disc Stainless Steel Stainless Steel Stainless Steel 

Other Internal Parts Stainless Steel Stainless Steel Stainless Steel 

Non-wetted Components 

(Flow Monitors) 

Window Tube Polycarbonate Polycarbonate Polycarbonate 

Window Seals 

(Transmitters and Alarms) 

Buna-N Buna-N Buna-N 

Enclosure & cover Aluminium Aluminium Aluminium 

Seals Buna-N Buna-N Buna-N 

Window Pyrex Pyrex Pyrex 

DIN connector Polyamide Polyamide Polyamide 

N.B. (1) The outer polycarbonate window tube is a replaceable part in case damage or scratching 

makes visibility difficult. Contact Stauff for specific part numbers. 

(2) A digital readout is available for use with the transmitter to permit remote flow readings. 

STAUFF CORPORATION PTY LTD 

HEAD OFFICE 

24 - 26 Doyle Avenue 


P.O. Box 227 


Tel. (02) 4271 1877 

Fax.(02) 4271 8432 

E-mail: sales@stauff.com.au 

http://www.stauff.com 

ADELAIDE 

1/3 Endeavour Drive 


P.O. Box 208 


Tel. (08) 8341 2260 

Fax.(08) 8341 1604 


Additional diagnostic equipment available from Stauff 

BRISBANE 

463 Boundary Road 


P.O. Box 20 


Tel. (07) 3217 0444 

Fax.(07) 3217 0300 

MELBOURNE 

3B 14 - 16 White Street 

OAKLEIGH EAST VIC 3166 

P.O. Box 453 

MULGRAVE VIC 3170 

Tel. (03) 9543 5411 

Fax.(03) 9543 5422 

W 

SYDNEY 

27B Davis Road 

WETHERILL PARK 

NSW 2164 

P.O. Box 7180 

WETHERILL PARK DC 

NSW 2164 

Tel. (02) 9725 2733 

Fax.(02) 9725 2744 

A 

B 

Proudly distributed by 

STAUFF CORPORATION 

(NZ) LTD 

AUCKLAND 

STAUFF CORP (NZ) Ltd 

Unit J 150 Harris Road 

EAST TAMAKI 

P.O. Box 58517 

GREENMOUNT 

Tel. (09) 271 4812 

Fax. (09) 271 4832 

E-mail: sales@stauff.co.nz 

S-FT 0802

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