| 摘要 |
A control circuit for a plurality of manual control valves each controlling a hydraulic motor including a bypass valve and a first logic system including a means for each control valve adapted to select and transmit the load actuating pressure. The circuit includes a second logic system connected to the first logic system which selects the highest pressure signal transmitted by the first logic system and supplies same to a control means for the source of supply pressure to act as a signal pressure to ensure that adequate pressure exists in the fluid pressure supply conduit to the control valves.
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