Hydraulic Accumulators

Hydraulic accumulators use an incompressible fluid and a compressed gas, spring or raised mass to store energy, absorb shock, eliminate noise, and counter-balance loads. Devices that use a compressed gas such as nitrogen usually include separate fluid and gas compartments. The fluid section connects to the hydraulic circuit so that as pressure rises, fluid enters the accumulator and the gas is compressed. As pressure falls, the compressed gas expands and forces the stored fluid back into the system. Spring-loaded hydraulic accumulators are small, lightweight devices that are suitable for mobile applications with low volumes and pressures below 500 psi. Some hydraulic accumulators use a bellows as a spring cushion. Raised mass or weight-loaded devices often use concrete discs loaded onto an oversized piston. Typically, these units are found in high-demand applications such as steel mills.

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