check valve

noun
a valve permitting liquids or gases to flow in one direction only.

Origin:
1875–80

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
check valve
 
n
Also called: nonreturn valve a valve that closes by fluid pressure to prevent return flow

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
The pipe is fitted with a check valve that permits water to flow in only one
  direction.
The check valve must be located upstream from the injection point.
The fire was caused by oil and gas which backed up through a malfunctioning
  check valve in the generator drip pan drain.
The bailer is pulled up when the desired depth is reached, with the weight of
  the water closing the check valve.
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