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Charging Kit #STA-CK-1 Accumulators and Accessories 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 Accumulators and Accessories • 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.
Page 1 and 2: STAUFF Accumulators and Accessories
Page 3 and 4: CONTENTS 2 Accumulators and Accesso
Page 5 and 6: Material Options and Features 4 Mai
Page 7 and 8: 6 Accumulators and Accessories Stau
Page 9 and 10: 8 Part No. Accumulators and Accesso
Page 11 and 12: Safety Blocks 10 P Stauff Code Accu
Page 13: Clamps and Brackets Saddle Clamps S
Page 17 and 18: Disassembly Instructions Bladder Ty
Page 19 and 20: Sizing Chart for Storage Applicatio
Page 21 and 22: STAUFF Australia HEAD OFFICE SYDNEY
Page 23 and 24: A In-Line Flow Monitors Stauff’s
Page 25: PHYSICAL DETAILS Monitor Switch Ala

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