Air lock and dust discharge valve open or close in turn up and down.

锁气翻板卸灰阀为上下交替开闭，自动复位机构。

youdao

Stroke the valve open and closed several times, with no line pressure.

在没有任何管道压力状态下开启和关闭阀门几次。

youdao

The cycle of operation of the four-stoke engine begins with the piston at TDC and the intake valve open.

四冲程发动机的工作循环是以活塞在上止点、进气门打开为开始的。

youdao

In other words, if your plants get low on moisture, you'd be able to program a flow valve to open automatically.

ENGADGET

That thinking changed on March 28, 1979, when a small valve stuck open, cooling water escaped and the reactor core of TMI's Unit 2 began to melt.

CNN: Three Mile Island, 20 years later

But not before an open valve spilled 71, 000 gallons of crude, blanketing the town.

FORBES: Slick