A valve immediately shuts off the gas when the lid is closed.

当盖子合上时，立刻会有一个阀门切断煤气。

《牛津词典》

Before leaving, Mr. Seymour turned off the vacuum cleaner and the water valve.

在离开之前，西摩先生关掉了真空吸尘器和水阀。

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Finally, Dad turned off the stove, the pot began to cool and the pressure relief valve sprayed out a cloud of steam.

最后，爸爸关上了炉子，锅开始降温，然后解压阀喷出了一股水汽。

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That starts off with a "junk shot, " in which material such as rubber tires and golf balls is pumped into the shut-off valve, or blowout preventer, that sits atop the well.

WSJ: Spill Fight Shows Progress

Among other response activities are on-water skimming, subsurface wellhead operations, continued efforts to see if they can get that shut-off valve to close, and significant booming efforts underway to protect vital shoreline.

WHITEHOUSE: Press Briefing on Oil Spill in Gulf of Mexico

Transistor radios got cheaper and better and, within a decade, had killed off the thermionic-valve industry.

ECONOMIST: OPINION