| 摘要 |
<p>The return flow passage from the load is connected to a switchover valve, the position of which is controlled by a control flow that is present while the pump is operating. Should the pump be shut off when the control is unintentionally set to lower the load, lowering is prevented by a shut-off member in the switchover valve that is biased to close the return flow passage when the control flow is not present.</p> |
