先开启旁通阀平衡压力，再开阀，后开启水轮机。

First opens the by-pass valve counter-pressure, then operates the valve, latter opens the hydraulic turbine.

youdao

先开启旁通阀平衡压力，再开阀，后开启水轮机。

First opens the by-pass valve counter-pressure, then operates the valve, latter opens the hydraulic turbine.

youdao