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Piston Accumulators


HYDAC piston accumulators are hydropneumatic accumulators. Indeed, its floating piston serves as a separation element between a compressible gas cushion and the operating fluid.

First of all, their components are:

  • A cylindrical jacket with a finely processed interior, a screwed-in cover on the gas and fluid side as a rule
  • And a piston with special sealing systems

Therefore, the adjustment of the piston accumulators can be very flexible according to customer requirements.

 What’s more, selection of the volume is practically stepless. Also, the piston position can be visible and be serving for switching functions in the hydraulic system.


  • Nominal volume: up to 3,300 l
  • Permitted operating pressure: up to 1,000 bar
  • Piston velocity: dependent on sealing system, usually up to 5 m/s; higher velocities possible
  • Accumulator shell materials: carbon steel, stainless steel, aluminum


  • The minimal pressure differential between the fluid side and gas side
  • Large usable volumes
  • A variable installation position
  • Monitoring of the piston position possible using various systems
  • Particularly suitable for backup configurations
  • Also, an extreme flow rates
  • And no sudden discharge of gas when seals are worn


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HYDAC Australia

HYDAC New Zealand

AUSTRALIA 1300 449 322

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