At some point, it releases energy as a pressurized fluid, builds up energy as a pressurized gas, and then replenishes the system in a timely and sufficient manner to return to its initial state.

The piston accumulator is specifically composed of two chambers, of which * chambers are filled with gas under appropriate pressure, and * two chambers are connected to the hydraulic circuit.

The air pressure must be selected according to the working conditions of the accumulator and represents the precharge pressure.