If valves are periodically inspected and preventive maintenance done, the valve will last longer and operate better.

如果对阀门进行定期检查，并且进行预防性维护，则阀门使用寿命会更长，操作性能也会更好。

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But if one of the pumps fails, they may still have to make a call: not all the valves can be remotely controlled.

但如果有一台水泵出现了故障，他们可能还是要拨打电话，因为有些阀门还没有实现远距遥控。

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Valves in the veins prevent blood from flowing backward toward the head, but if the valves don't close sufficiently, blood could seep back upward.

静脉中的瓣膜阻止血液倒流到脑部，但是如果瓣膜不足，血液会就会再次流到大脑。

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We'll talk about how your normal valves function inside your heart and how your heart couldn't work in the way that it did if it didn't have valves that were doing a very complex operation many many times a day.

我们会讨论,正常的瓣膜在心脏中如何工作,以及没有这个,每天不停完成很多复杂任务的心脏瓣膜,心脏为什么,就不能正常工作了

耶鲁公开课 - 生物医学工程探索课程节选

If the regulating valves fail or if the cabin structure is breached (by a failure of a door or window for example) then the pressure in the cabin would suddenly drop to match the outside air pressure.

BBC: NEWS | Europe | Dangers of aircraft decompression

The college spread has elevated the function of slot receivers, who often work the middle of the field as safety valves whom the quarterback can target if pressured.

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The Renewable Fuels Standard builds in "safety valves" in the event of extreme economic harm in states or regions or if the ethanol industry does not produce an adequate supply.

WSJ: Review & Outlook: Ethanol vs. the World