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. 2014.
Cite This Source Link To intake valve
Example sentences
Start the water flowing by turning off the water intake valve at the tank and
  turning on the hot water faucet.
The first stroke involves drawing air into a cylinder as the piston creates
  space for it by moving away from the intake valve.
Start the water flowing by turning off the water intake valve at the tank and
  turning on the hot-water faucet.
Start the water flowing by turning off the water intake valve at the tank and
  turning on a hot-water faucet.
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