由于先导卸荷阀5内的单向阀作用，可以实现系统保压而油泵卸荷。

The pilot unloading valve 5 of the one-way valve can be achieved system-pressure pump and unloading.

youdao

由于先导卸荷阀5内的单向阀作用，可以实现系统保压而油泵卸荷。

The pilot unloading valve 5 of the one-way valve can be achieved system-pressure pump and unloading.

youdao