- A door; especially, one of a pair of folding doors, or one
of the leaves of such a door. - A lid, plug, or cover, applied to an aperture so that by its
movement, as by swinging, lifting and falling, sliding, turning, or the
like, it will open or close the aperture to permit or prevent passage,
as of a fluid. - 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 retard the flow in the opposite direction; as,
the ileocolic, mitral, and semilunar valves. - One of the pieces into which a capsule naturally separates
when it bursts. - One of the two similar portions of the shell of a diatom. - A small portion of certain anthers, which opens like a
trapdoor to allow the pollen to escape, as in the barberry. - One of the pieces or divisions of bivalve or multivalve
shells.
Purge valve Purge valve is in an evaporative emissions control system, the valve that allows the venting of fuel vapors from the charcoal canister to a vehicles
PCV filter/PCV valve PCV filter/PCV valve positive crankcase ventilation filter/positive crankcase ventilation valve. Devices that allow the venting of combustion
Plenum chamber water drain valve Plenum chamber water drain valve is a valve used on some vehicles to drain collected condensation from the intake plenum.
Manifold heat control valve Manifold heat control valve is a thermostatic device that routes exhaust heat to the intake manifold in order to promote fuel vaporization and
Crankcase depression regulator valve Crankcase depression regulator valve is a valve that prevents excess pressure from building in the crankcase (which could lead to oil leakage
Exhaust pressure regulator valve Exhaust pressure regulator valve is a device that directs warm exhaust to a vehicles intake in an effort to aid fuel vaporization and reduce warm-up
Diverter valve Diverter valve is on an engine equipped with an air pump, a valve activated during deceleration that allows air from the air pump into the
Bi-level purge valve Bi-level purge valve in an evaporative emissions system, a valve that limits the flow of vapor from the charcoal canister to the intake during
Positive crankcase ventilation (PCV) valve Positive crankcase ventilation (PCV) valve is emission control system that redirects crankcase vapors back into the engine to be burned.
Definition
[ n.]