Lock the exhaust valve in its open position.

把排气阀固定在它开启的位置。

Internal exhaust valve increases down stroke speed.

内部排气阀增加下冲速度。

Wet mill end cover is installed on the exhaust valve.

湿磨机端盖上安装放气阀。

As the piston reaches BDC again the exhaust valve opens.

当活塞再一次到达下止点时，排气门打开。

As the piston reaches BDC again, the exhaust valve opens.

当活塞再一次到达下止点时，排气门打开。