旋紧式泄水阀，开启方便。

Screw type drain valve, convenient opening.

youdao

泄水阀应该是一种闸阀，并且有一致的闸板。

Sluice valves are to be of a non-rising stem type and to have solid wedge discs.

youdao

泄水阀应该是一种闸阀，并且有一致的闸板。

Sluice valves are to be of a non-rising stem type and to have solid wedge discs.

youdao