valve
noun/vælv/
/vælv/
- a device for controlling the flow of a liquid or gas, letting it move in one direction only
阀；阀门；活门；气门 - The plumber will fit some new safety valves.
水暖工将安装几个新的安全阀。 - You need special tools to open the valve.
这种阀门要用专门的工具打开。
Oxford Collocations Dictionaryadjective- safety
- shut-off
- non-return
- …
- fit
- install
- open
- …
- The plumber will fit some new safety valves.
- (anatomy) a structure in the heart or in a vein that lets blood flow in one direction only
（心脏或血管的）瓣（膜） Oxford Collocations Dictionaryadjective- safety
- shut-off
- non-return
- …
- fit
- install
- open
- …
- (music) a device in some brass musical instruments for changing the note
enlarge image（铜管乐器的）阀键，活塞
Word Originlate Middle English (denoting a leaf of a folding or double door): from Latin valva.