| 摘要 |
Pressure control systems for a pressure accumulator are known in which the pressure accumulator is fed by a controllable pump. When the pressure accumulator serves to supply at least two user components each requiring a different minimum feed pressure for correct operation, it is desired to provide a pressure control system which is safe in its mode of operation, simple in its construction and needs little energy for maintaining the feed pressure. This is accomplished according to the present invention by a switching device which switches on the pump when the accumulator pressure falls below a first threshold value corresponding to lowest minimum feed pressure of the two user components and which switches off the pump when the accumulator pressure reaches a second threshold value corresponding to the highest minimum feed pressure of the two user components with the switching device responding to the return pressure from that one of the two user components having the highest minimum feed pressure when operated to raise the first threshold value to approximately the second threshold value.
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