Piston accumulators
Piston accumulators
Piston accumulator
... are hydropneumatic accumulators with a free-moving piston as a separation element between a compressible gas cushion and the operating fluid. HYDAC piston accumulators are comprised of a cylindrical jacket with a finely processed interior, with screwed-in cover on the gas and fluid side as a rule and a piston with special sealing systems. Piston accumulators can be adjusted very flexibly to customer requirements. Selection of the volume is practically stepless. The piston position can be made visible and also be used for switching functions in the hydraulic system.
Essential parameters are:
- Nominal volume: up to 3,300 l,
- Permissible operating overpressure: up to 1,000 bar
- Piston speed: dependent on sealing system, usually up to 5 m/s; higher speeds possible,
- Accumulator body materials: C steel, rustproof materials, aluminium.
The HYDAC piston accumulators are noteworthy for the following advantages:
- minimal pressure differential between fluid side and gas side,
- large utilisable volumes,
- variable installation position,
- Monitoring of the piston position possible using a variety of systems,
- particularly suitable for back-up configurations.
- extreme flow rates,
- No sudden discharge of gas when seals are worn.
