FAQ
1.What products can Siken Hydraulics provide?
l Piston accumulator
l Bladder accumulator
l Shells/gas bottles
l Pulsation damper
l Gas valve
l Charging tools
l Gas booster
l Ball valve
l Safety valve block
l Mountign brackets
l Piston pump
2. What piston accumulator can Siken Hydraulics provide?
l The pressure range up to 20000PSI(138Mpa)
l The volume up to 500 Liters
l Diverse materials including Caron steel, Stainless Steel, Titanium alloy,Alunimum alloy, Inconel, plastic materials etc...
l The seals including NBR, HNBR, EPDM(EPR), FPM(Viton), Butyl, PTFE, ALCRYN, POLIURETHANE etc..
l Follow differetn standards , such as ASME, CE/PED, ABS,DNV etc.to meet our customers’ diverse needs for our products.
3. What bladder accumulator can Siken Hydraulics provide?
l The pressure range up to 10000PSI(69Mpa)
l The volume up to 300 Liters
l Diverse materials including Caron steel, Stainless Steel, plastic materials etc...
l The bladders including NBR, HNBR, EPDM(EPR), FPM(Viton), Butyl, PTFE, ALCRYN, POLIURETHANE etc..
l Follow differetn standards such as ASME, CE/PED, ABS,DNV etc.to meet our customers’ diverse needs for our products.
4. What accumulator bladders can Siken Hydraulics provide?
l The pressure range up to 10000PSI(69Mpa)
l The volume up to 300 Liters
l The bladders including NBR, HNBR, EPDM(EPR), FPM(Viton), Butyl.
l Follow differetn standards,such as ASME, CE/PED, ABS,DNV etc.to meet our customers’ diverse needs for our products.
5. What shells can Siken Hydraulics provide?
l The pressure range up to 20000PSI(138Mpa)
l The volume up to 500 Liters
l Follow differetn standards,such as ASME, CE/PED, ABS,DNV etc.to meet our customers’ diverse needs for our products.
6. What gas valves can Siken Hydraulics provide?
l Europe standard gas valve up to 10000PSI (690Bar)
l USA stadard gas valve up to 10000PSI (690Bar)
7.What is the connection of the charging tools can Siken Hydraulics provide?
l M14*1.5, M28*1.5; .305-32UNS; G1/4”; 5/8-18UNF; 7/8-14UNF; M14*1.5
8. What fluid port can Siken Hydraulics provide for the accumulator?
l Thread: BSP, NPT, SAE, Metric Thread
l Flange: SAE flange, B16.5flange, custom deisgn flange is available
9.What ball valve can Siken Hydraulics provide?
l High pressure thread ball valve, flanged ball valve, wafer ball valve, shut-off vlave, choke valve, safety valvebocks,
10.What charging assembly can Siken Hydraulics provide?
l Multi-functional,
l Pressure ranging：0－690Bar
l Length of the tube: 1.5 m,3 m, 5 meter, 10 mite
l Connection: M28*1.5; 8V1; G1/4”; 5/8-18UNF; 7/8-14UNF; M14*1.5
11. What gas booster can Siken Hydraulics provide?
l Gas-gas booster, Gas-fluid booster
12. What mounting brackets can Siken Hydraulics provide?
l All kinds of mouting brackets for all accumulator mfg’ all over the world.
13. Are Siken Hydraulics accumulator can be interchangeable with other manufacturer’s accumulator?
l Yes. Siken Hydraulics piston accumulator, bladder accumulators,diaphragm accumulator, accumulator bladders and components are interchangeable with those supplied by other manufacturers whether Europe standards of USA stadnards, including Parker, Olaer ,hydac, QHP,etc.
14. How does a bladder accumulator work?
l A bladder accumulator consists of a pressure vessel or shell typically made of steel. Inside the accumulator, there are two main compartments separated by a flexible bladder. One compartment contains Hydraulics fluid, while the other compartment contains compressed gas, usually nitrogen. Initially, the accumulator is charged by filling the Hydraulics fluid into the fluid compartment while compressing the gas in the gas compartment. As the gas is compressed, it pushes against the flexible bladder, causing it to deform and reduce the volume of the fluid compartment. When there is a demand for Hydraulics energy, the stored energy is released from the accumulator. The pressurized Hydraulics fluid is allowed to flow out of the accumulator, and as it exits, the gas expands, supplying additional energy to the system.
15. How does a piston accumulator work?
l A piston accumulator consists of a pressure vessel or cylinder and a piston that divides the cylinder into two compartments. The piston is typically sealed with piston rings to ensure proper sealing between the compartments. Initially, the accumulator is charged by introducing Hydraulics fluid into one side of the cylinder while compressing the gas or air in the other side. The pressure exerted on the Hydraulics fluid side forces the piston towards the gas side, compressing the gas. When there is a demand for Hydraulics energy, the stored energy is released from the accumulator. The pressurized Hydraulics fluid is allowed to flow out of the accumulator, and as it exits, the piston moves towards the Hydraulics fluid side, delivering the stored energy to the system.
16. How does a disphragm accumulator work?
l A diaphragm accumulator consists of a pressure vessel or housing typically made of steel. Inside the accumulator, there is a flexible diaphragm that separates the gas and fluid compartments. The diaphragm is typically made of a durable and flexible material, such as rubber or elastomer. Initially, the accumulator is charged by filling Hydraulics fluid into the fluid compartment while compressing the gas in the gas compartment. As the gas is compressed, it exerts pressure on the flexible diaphragm, causing it to deform inward and reduce the volume of the fluid compartment. When there is a demand for Hydraulics energy, the stored energy is released from the accumulator. The pressurized Hydraulics fluid is allowed to flow out of the accumulator, and as it exits, the diaphragm returns to its original shape, pushing the gas back and delivering the stored energy to the system.
17. What are the advantages of bladder accumulator over piston accumulator?
l Fast response to pressure change.
l Complete separation of gas and fluid
l Less Sensitivity to Contaminants
l Reduced Maintenance, trouble-free operation
l Cost-Effectiveness, simpler designs, require fewer components, easier to repair
l The gas compression ratio is 4.
18. What are the advantages of piston accumulator over bladder accumulator?
l Higher Operating Pressure
l Larger volume
l Higher operating temperature
l Higher fluid-to-gas ratio
l Long Service Life
l Diverse size to meet different installation space
l The gas compression ratio is higher than bladder accumulators.
19. WHY USE DRY NITROGEN GAS (N2)?
l The dry nitrogen gas is inert and non-reactive with Hydraulics fluids, preventing any chemical reactions or contamination. This ensures the integrity and stability of the Hydraulics system, as nitrogen does not react with the fluid or introduce impurities. Dry nitrogen gas maintains stable and consistent pressure over a wide range of temperatures and pressures. This allows for predictable and reliable operation of the accumulator, ensuring consistent performance and energy storage capabilities. Nitrogen gas is non-flammable, which enhances the safety of the accumulator system. In case of any accidental leaks or releases, the risk of ignition or combustion is minimized, reducing the potential hazards. Dry nitrogen gas is relatively affordable and cost-effective compared to other gases. It provides a practical and economical solution for maintaining the gas pressure in the accumulator, contributing to the overall cost efficiency of the system. Nitrogen gas is compatible with most accumulator materials and components, such as seals, diaphragms, and bladders. It does not degrade or cause deterioration of these components, ensuring long-term compatibility and performance. Nitrogen gas is readily available and commonly used in various industries. It can be easily obtained, ensuring a convenient and accessible source for accumulator charging and recharging.
20. How to precharge an accumulator?
l Precharging an accumulator involves filling the gas side of the accumulator with the appropriate precharge pressure. Here's a general procedure for precharging an accumulator:
1.Safety Precautions: Before starting the precharging process, ensure that you follow proper safety precautions. Make sure the Hydraulics system is depressurized and isolated.
2. Determine Precharge Pressure: Refer to the manufacturer's guidelines or specifications to determine the recommended precharge pressure for the specific accumulator.
3. Prepare Precharging equipment:
4. Ensure that the fluid side of the accumulator is isolated
5. Connect the pressure source (nitrogen bottle or compressor) to the gas valve or fitting on the accumulator.
6. Slowly increase pressure from the source while monitoring the pressure gauge.
7. As you reach the desired precharge pressure, monitor the pressure gauge and ensure it remains stable.
8. Once the precharge pressure is set, secure the gas valve or fitting to prevent any leaks. Disconnect the pressure source from the accumulator, ensuring a safe disconnection procedure
9. Record the precharge pressure and mark the accumulator with the precharge pressure for future reference and maintenance purpose.
21. What is the position of the accumulator during the installation
l Vertical posotion is recommended; however, horizontal position is acceptable with little loss of efficiency when lubricated properly. Piston or diaphragm accumulators can be mounted in any directions.
22 . What is function o the safety valve block?
l A safety block is typically used in Hydraulics systems to isolate and secure an accumulator during maintenance, inspection, or repair activities.It is used for Maintenance or Repair, System Shutdown, Pressure Relief and Emergency Situations.
23. How often to check the accumulator when it is in operation?
l If the accumulator is a frequent application it should be checked weekly. If the accumulator is used for emergency or pressure holding, it should be checked monthly.
24. Can Siken Hydraulics make custom design accumulators?
Yes. We have Hydraulics experts and we specialied in design and manufacturing of special accumulators.