油源来油就从换向阀进入执行元件工作，其工作压力大小由导阀控制.此时系统压力为导阀调整压力.该种卸荷方式，即使换向阀路数增加，只是控制油道增加，卸荷压力增加不大，始终保持较低卸荷压力，此种卸荷方式多用于手动换向阀，卸荷可靠.
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