intake valve

noun
a valve in the cylinder head of an internal-combustion engine that opens at the proper moment in the cycle to allow the fuel-air mixture to be drawn into the cylinder.

Origin:
1960–65

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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WordNet
intake valve

noun
a valve that controls the flow of fluid through an intake 
WordNet® 3.0, © 2006 by Princeton University.
Cite This Source
00:10
Intake valve is always a great word to know.
So is ninnyhammer. Does it mean:
a fool or simpleton; ninny.
a gadget; dingus; thingumbob.
Example sentences
Fill the bathtub and large containers with water unless advised by authorities
  to turn off the main water intake valve.
Be prepared to turn off the main water intake valve in case authorities advise
  you to do so.
Each of these devices has an air-intake valve that would create a
  cross-connection the instant it became submerged.
Start the water flowing by turning off the water intake valve at the tank and
  turning on the hot water faucet.
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