阀门 fámén valve (mechanical)
How to remember 阀门: 阀 valve + 门 door = valve (mechanical).
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How it is used
- The mechanical valve that controls flow of fluid or gas - 关闭阀门 (guānbì fámén) to shut the valve.
- A concrete engineering/plumbing term; 阀 alone rarely stands for the valve in speech, so 阀门 is the everyday word.
- Don't confuse 阀 here with its other sense in 军阀 (jūnfá, warlord) / 财阀 (a powerful clique).