Why Piston Accumulator

Two of the most commonly used hydraulic accumulators are the bladder accumulator and the piston accumulator. A third type of accumulator, the membrane/diaphragm accumulator, is typically used for small volumes.

Each type of accumulator has advantages and limitations that must be considered. When choosing your accumulators, you should take into consideration such factors as response time, system speed, mounting orientation, fluid type, pressure, temperature, diagnostic characteristics, maintenance and service intervals as well as costs for servicing and downtime.


FEATURE / TYPE OF ACCUMULATORPISTONBLADDERMEMBRANE
Oil flow rateHighLowMedium
Compression ratio (max. pressure
to pre-charge pressure)
10:14:16:1
Horizontal mounting positionYesNoNo
Size optimization for system requirementsYesNoNo
Space requirementSmallLargeMedium
Sensoring ( e.g. pressure and
piston position monitoring)
YesNoNo
Temperature tolerance (low)- 45°C- 25°C- 25°C
Extra gas tank connectionYesYesNo
Dual functionality (dual piston or gas chamber)YesNoNo
Gas permeation (loss off pre-charge pressure)Very lowHighHigh
Service intervalLongShortShort
Response timeMediumMediumHigh
Tolerance for dirtLowHighMedium
Pre-charge lost in case of failureGradualImmediateImmediate

   = Better

Main application for accumulators in hydraulic systems:

  • Energy storage
  • Damping of pump pulsations
  • Shock absorber
  • Flow stabilizer
  • Emergency or safety back up in hydraulic system
  • Primary power source for low volume systems