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A valve lets blood go through one way but stops it when it tries to go the other way.
A valve that people can open to let water go through.
- (countable) A valve is part of a tube that lets liquid or gas go through one way but stops it from going through the other way.
- There are four valves in the heart that let blood go in one direction but stop it from going in the other direction.
- (countable) A valve is part of a tube that someone can open or close to let water or other things go through.
- Open this valve to let water go through the pipe.
