Hydraulic accumulator

An accumulating hydraulics , or accumulating of water pressure , is a pressure tank of gas which can contain a variable volume of Eau under pressure, used to provide an important flow during a rather short time.

Such an apparatus is known as accumulating oleohydraulic when it is included in “hydraulic” circuits functioning with Huile (special for the Hydraulique). The gas under pressure is then of nitrogen. The energy stored in such an apparatus is given by the formula:

E = P.V (with E: Energy in Joule, P: Pressure in a PASCAL and V: Volume in m ³). The pressure is in absolute value.

According to the use, storage of energy or shock absorber of pulsation, one will use the following laws of behavior:

Isothermal: The heat transfers are possible. In this case the accumulator is used in reserve of energy.
Adiabatic: The discharge and the charging of the battery are fast and the heat transfers are difficult. In this case the formula of computation used is: E = P.V^γ with γ = 1,4 for nitrogen.

Separation between gas and the fluid is carried out either by a membrane elastomer or by a piston. With water, one uses compressed air without separator. It is in this case essential to supervise the level in the tank.