valve


valve

noun \ˈvalv\

: a mechanical device that controls the flow of liquid, gas, etc., by opening and closing

: a device in some musical instruments (such as trumpets) that you press to play different notes

medical : a structure in the heart, stomach, etc., that temporarily stops the flow of fluid or that allows fluid to move in one direction only

Full Definition of VALVE

1
archaic :  a leaf of a folding or double door
2
[New Latin valva, from Latin] :  a bodily structure (as the mitral valve) that closes temporarily a passage or orifice or permits movement of fluid in one direction only
3
a :  any of numerous mechanical devices by which the flow of liquid, gas, or loose material in bulk may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also :  the movable part of such a device
b :  a device in a brass instrument for quickly channeling air flow through an added length of tube in order to change the fundamental tone by some definite interval
c chiefly British :  electron tube
4
[New Latin valva, from Latin] :  one of the distinct usually hinged and movable pieces of which the shell of some shell-bearing animals (as lamellibranch mollusks, brachiopods, and barnacles) consists
5
[New Latin valva, from Latin]
a :  one of the segments or pieces into which a dehiscing capsule or legume separates
b :  the portion of various anthers (as of the barberry) resembling a lid
c :  one of the two encasing membranes of a diatom
valved \ˈvalvd\ adjective
valve·less \ˈvalv-ləs\ adjective

Examples of VALVE

  1. They turned off the main water valve to the house.

Origin of VALVE

Latin valva; akin to Latin volvere to roll — more at voluble
First Known Use: 14th century

Related to VALVE

Other Anatomy Terms

bilateral symmetry, carotid, cartilage, dorsal, entrails, prehensile, renal, solar plexus, supine, thoracic, ventral

Rhymes with VALVE

valve

noun \ˈvalv\   (Medical Dictionary)

Medical Definition of VALVE

1
: a bodily structure (as the mitral valve) that closes temporarily a passage or orifice or permits movement of fluid in one direction only
2
: any of various mechanical devices by which the flow of liquid (as blood) may be started, stopped, or regulated by a movable part that opens, shuts, or partially obstructs one or more ports or passageways; also : the movable part of such a device

Illustration of VALVE

valve

noun    (Concise Encyclopedia)

A globe valve controls the flow of a fluid through a pipe, inlet, or outlet. To stop the flow …—© Merriam-Webster Inc.

In mechanical engineering, a device for controlling the flow of fluids (liquids, gases, slurries) in a pipe or other enclosure. It exerts control by means of a movable element that opens, shuts, or partially blocks an opening in a passageway. Valves are of seven main types: globe, gate, needle, plug (cock), butterfly, poppet, and spool. Some valves operate automatically; check (or nonreturn) valves, for example, are self-acting valves that permit flow in only one direction. Safety valves open at a predetermined pressure; the movable element usually has a weighted lever or a spring strong enough to hold the valve closed until a particular pressure is reached.

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