valve

A valve is a device that controls the flow of a liquid or gas. Before you fix the broken sink in your bathroom, you should turn the valve that shuts off the water.

The simplest type of valve has a hinged flap allowing liquid to flow one direction, but blocking it from going the other way. This is called a "check valve." Anatomical valves — systems in your body that allow a flow of fluid, like the aortic valve near your heart — are structured very much the same way. The shells of mollusks like oysters and clams are also called valves. The word's earliest meaning was "one half of a folding door."

Primary Meanings of valve

1.
n
control consisting of a mechanical device for controlling the flow of a fluid
2.
n
the entire one-piece shell of a snail and certain other molluscs
Full Definitions of valve
1

n control consisting of a mechanical device for controlling the flow of a fluid

Types:
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accelerator, throttle, throttle valve
a valve that regulates the supply of fuel to the engine
ball valve
any valve that checks flow by the seating of a ball
butterfly valve
a valve in a carburetor that consists of a disc that turns and acts as a throttle
choke
a valve that controls the flow of air into the carburetor of a gasoline engine
clack, clack valve, clapper valve
a simple valve with a hinge on one side; allows fluid to flow in only one direction
exhaust valve
a valve through which burned gases from a cylinder escape into the exhaust manifold
intake valve
a valve that controls the flow of fluid through an intake
poppet, poppet valve
a mushroom-shaped valve that rises perpendicularly from its seat; commonly used in internal-combustion engines
escape, escape cock, escape valve, relief valve, safety valve
a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
slide valve
valve that opens and closes a passageway by sliding over a port
automatic choke
a choke that automatically controls the flow of air to the carburetor
Type of:
control, controller
a mechanism that controls the operation of a machine

n a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it

Types:
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cardiac valve, heart valve
a valve to control one-way flow of blood
valvelet, valvula, valvule
a small valve
ileocecal valve
valve between the ileum of the small intestine and the cecum of the large intestine; prevents material from flowing back from the large to the small intestine
atrioventricular valve
either of two heart valves through which blood flows from the atria to the ventricles; prevents return of blood to the atrium
semilunar valve
a heart valve with cusps shaped like half-moons; prevents blood from flowing back into the heart
Type of:
anatomical structure, bodily structure, body structure, complex body part, structure
a particular complex anatomical part of a living thing

n device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone

Type of:
device
an instrumentality invented for a particular purpose
2

n the entire one-piece shell of a snail and certain other molluscs

Type of:
shell
the hard largely calcareous covering of a mollusc or a brachiopod

n one of the paired hinged shells of certain molluscs and of brachiopods

Type of:
shell
the hard largely calcareous covering of a mollusc or a brachiopod

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