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Hydraulic Accumulators

In industrial and mobile applications, three types of hydro-pneumatic accumulators - piston, bladder and diaphragm - are used. Each has particular advantages and limitations which should be considered when selecting an accumulator for a specific application.


Bladder/Diaphragm accumulators are generally preferred for applications where rapid cycling, high fluid contamination and fast response times are required. They provide excellent gas/fluid separation.


Piston accumulators offer greater efficiency and flexibility in most applications, due to their wider range of sizes.  Parker’s piston accumulators feature a five-blade V-O-ring which maintains full contact between the piston and the bore, without rolling.  Sealing remains effective even under rapid cycling at high operating pressures.

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Hydraulic Accumulator Products and Accessories - Full Catalog

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Bladder Accumulators

Parker’s bladder accumulators feature a non-pleated, flexible rubber bladder housed within a steel shell.  A steel gas valve is molded on the top of the bladder.  A poppet valve, normally held open by spring force, prevents the bladder from extruding through the port when the bladder is fully expanded in the shell.  Bladder accumulators are available as either top or bottom repairable, for optimum flexibility.

Diaphragm Accumulators

Parker’s diaphragm accumulators feature a one-piece molded diaphragm which is mechanically sealed to the high strength metal shell.  The flexible diaphragm provides excellent gas and fluid separation.  The non-repairable electron-beam welded construction reduces size, weight and ultimately cost.

Piston Accumulators

Parker’s piston accumulators consist of a cylindrical body, sealed by a gas cap and charging valve at the gas end, and by a hydraulic cap at the opposite end.  A lightweight piston separates the gas side of the accumulator from the hydraulic side.

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