valve
n//ˈvælv//ventil, klaff
Such a device that admits fuel and air into the cylinder of an internal combustion engine, or one that allows combustion gases to exit.
A device that controls the flow of a gas or fluid through a space, such as a pipe, manifold, or plenum.
(anatomy) One or more membranous partitions, flaps, or folds, which permit the passage of the contents of a vessel or cavity in one direction, but stop or control the flow in the opposite direction.