Second, the manual unloading valve didn't matter.

第二，手动卸荷阀没有关紧。

youdao

Unloading valve is a valve to control the compressed air.

卸荷阀控制压缩空气的开关。

youdao

Unloading valve is a valve to control the compressed air.

卸荷阀控制压缩空气的开关。

youdao