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 ACCUMULATOR||PISTON||BLADDER||MEMBRANE|
|Oil flow rate||High||Low||Medium|
|Compression ratio (max. pressure|
to pre-charge pressure)
|Horizontal mounting position||Yes||No||No|
|Size optimization for system requirements||Yes||No||No|
|Sensoring ( e.g. pressure and|
piston position monitoring)
|Temperature tolerance (low)||- 45°C||- 25°C||- 25°C|
|Extra gas tank connection||Yes||Yes||No|
|Dual functionality (dual piston or gas chamber)||Yes||No||No|
|Gas permeation (loss off pre-charge pressure)||Very low||High||High|
|Tolerance for dirt||Low||High||Medium|
|Pre-charge lost in case of failure||Gradual||Immediate||Immediate|