Operation process as the medium pressure is help to open valve, so reduce operating torque.

操作过程由于介质压力是有助于阀门开启的，所以减小了操作力矩。

youdao

Operation process as the medium pressure is help to open valve, so reduce operating torque.

操作过程由于介质压力是有助于阀门开启的，所以减小了操作力矩。

youdao