| 摘要 |
<p>PURPOSE:To prevent reversing-flow from a first variable discharging amount pump to a second variable discharging amount pump, and control discharging pressure of both pumps according to load pressure of first and second actuators. CONSTITUTION:A first actuator 11 and a first variable discharging amount pump P1 are connected to each other through a switch valve 1. Also, a second actuator 19 and a second variable discharging amount pump P2 are connected to each other through a switching valve 18. Both pumps P1, P2 are connected to each other through a confluent valve 31. First and second pilot passages 12, 23 for leading load pressures of both actuators 11, 19 are connected to each other through the confluent valve 31. Furthermore, a shut-off valve 36 is provided between the confluent valve 31 and the second variable discharging amount pump P2.</p> |
