Piston Accumulators

High-Performance Energy Storage for Hydraulic Systems

Piston accumulators are robust, versatile devices used to regulate pressure, store energy, and absorb shock in hydraulic systems. Their design allows for precise control over fluid volume and pressure, making them ideal for demanding industrial and mobile applications.

At Hydraulics Online, we supply piston accumulators from a wide range of global manufacturers – including Parker, Hawe, Hydac, and QHP – with impartial advice to help you select the right solution for your system.

Our website shows only a selection of what we supply. For impartial advice and access to our full range of hydraulic components, contact our expert team.

Piston Accumulators. For impartial advice and access to our full range of hydraulic components, contact our expert team.

A piston accumulator consists of a cylindrical pressure vessel with a free-floating piston that separates a gas chamber (typically filled with nitrogen) from the hydraulic fluid. As system pressure increases, fluid enters the accumulator and compresses the gas. When pressure drops, the gas expands, pushing fluid back into the system.

This dynamic exchange helps maintain consistent pressure, reduce pump load, and improve system responsiveness.

Energy Storage – stores hydraulic energy for later use, reducing pump demand
Shock and Vibration Absorption – dampens pressure spikes and mechanical shocks
Leakage and Volume Compensation – maintains pressure in the event of fluid loss or thermal expansion
Emergency Power Supply – provides backup pressure in case of pump failure

These functions make piston accumulators essential in high-pressure systems, heavy-duty machinery, and precision industrial equipment.

Wide pressure and volume range – suitable for low to ultra-high-pressure systems
Durable construction – ideal for continuous-duty and harsh environments
Customisable performance – adjustable pre-charge and piston design for tailored response
Long service life – minimal wear and excellent sealing characteristics
Versatile mounting options – available in horizontal and vertical configurations

What’s the difference between piston, bladder, and diaphragm accumulators? Each type has unique advantages. Piston accumulators offer high pressure capacity and customisable performance, while bladder and diaphragm types are more compact and responsive. Our team can help you choose the best fit for your application.

Can piston accumulators be serviced or recharged? Yes, many models allow for gas recharging and piston seal replacement, extending their operational life.

Are piston accumulators suitable for mobile equipment? Absolutely. Their rugged design and flexible mounting options make them ideal for mobile and off-highway systems.