Special pressure switch valve with the task of switching the constant pump, which charges a hydraulic accumulator, to pressure-free circulation as soon as it reaches its charging pressure and to switch the pump back on when the accumulator pressure has dropped to a predetermined pressure (Figure S 67).
A good accumulator system should
- ensure the pump can be switched on and off exactly under the preselected pressures,
- have a small pressure switching difference (e.g. 5 to 10 bar),
- permits the pump to be switched on and off smoothly.
Figure S 67: Accumulator charging valve