Valve Valve, n. [L. valva the leaf, fold, or valve of a door: cf. F. valve.] [1913 Webster] 1. A door; especially, one of a pair of folding doors, or one of the leaves of such a door. [1913 Webster]

Swift through the valves the visionary fair Repassed. --Pope. [1913 Webster]

Heavily closed, . . . the valves of the barn doors. --Longfellow. [1913 Webster]

2. 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. [1913 Webster]

Note: A valve may act automatically so as to be opened by the effort of a fluid to pass in one direction, and closed by the effort to pass in the other direction, as a clack valve; or it may be opened or closed by hand or by mechanism, as a screw valve, or a slide valve. [1913 Webster]

3. (Anat.) 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. [1913 Webster]

4. (Bot.) (a) One of the pieces into which a capsule naturally separates when it bursts. (b) One of the two similar portions of the shell of a diatom. (c) A small portion of certain anthers, which opens like a trapdoor to allow the pollen to escape, as in the barberry. [1913 Webster]

5. (Zo["o]l.) One of the pieces or divisions of bivalve or multivalve shells. [1913 Webster]

{Air valve}, {Ball valve}, {Check valve}, etc. See under {Air}. {Ball}, {Check}, etc.

{Double-beat valve}, a kind of balance valve usually consisting of a movable, open-ended, turban-shaped shell provided with two faces of nearly equal diameters, one above another, which rest upon two corresponding seats when the valve is closed.

{Equilibrium valve}. (a) A balance valve. See under {Balance}. (b) A valve for permitting air, steam, water, etc., to pass into or out of a chamber so as to establish or maintain equal pressure within and without.

{Valve chest} (Mach.), a chamber in which a valve works; especially (Steam Engine), the steam chest; -- called in England {valve box}, and {valve casing}. See {Steam chest}, under {Steam}.

{Valve face} (Mach.), that part of the surface of a valve which comes in contact with the {valve seat}.

{Valve gear}, or {Valve motion} (Steam Engine), the system of parts by which motion is given to the valve or valves for the distribution of steam in the cylinder. For an illustration of one form of valve gear, see {Link motion}.

{Valve seat}. (Mach.) (a) The fixed surface on which a valve rests or against which it presses. (b) A part or piece on which such a surface is formed.

{Valve stem} (Mach.), a rod attached to a valve, for moving it.

{Valve yoke} (Mach.), a strap embracing a slide valve and connecting it to the valve stem. [1913 Webster]

The Collaborative International Dictionary of English. 2000.

Look at other dictionaries:

  • ValVe — Unternehmensform Private Corporation Gründung 1996 Untern …   Deutsch Wikipedia

  • valve — [ valv ] n. f. • 1752; « battant de porte » 1560; sens du lat. valva I ♦ 1 ♦ Chacune des deux parties de la coquille (dite bivalve) de certains mollusques et crustacés. « La valve rainurée d une coquille de Saint Jacques » (Proust). ♢ (1771) Bot …   Encyclopédie Universelle

  • valvé — valve [ valv ] n. f. • 1752; « battant de porte » 1560; sens du lat. valva I ♦ 1 ♦ Chacune des deux parties de la coquille (dite bivalve) de certains mollusques et crustacés. « La valve rainurée d une coquille de Saint Jacques » (Proust). ♢… …   Encyclopédie Universelle

  • Valve — Corporation Тип час …   Википедия

  • VALVe — Corporation Valve Corporation Dates clés 1996 (création) Personnages clés …   Wikipédia en Français

  • valve — [valv] n. [ME, a door leaf < L valva, leaf of a folding door, akin to volvere, to roll: see WALK; VALVE senses 3, 4, 8 < ModL valva < L] 1. Archaic either of the halves of a double door or any of the leaves of a folding door 2. a gate… …   English World dictionary

  • Valve — Software es una empresa estadounidense desarrolladora de software en el campo de los videojuegos. Se hizo mundialmente famosa por su primer juego, Half Life y por una modificación de este juego, Counter Strike. Las oficinas centrales de Valve… …   Enciclopedia Universal

  • valve — [vælv] n [Date: 1400 1500; : Latin; Origin: valva part of a door ] 1.) a part of a tube or pipe that opens and shuts like a door to control the flow of liquid, gas, air etc passing through it ▪ heart valves ↑mouthpiece, ↑valve 2.) the part on a… …   Dictionary of contemporary English

  • Valve — [vælv] der; [s], s <aus gleichbed. engl. valve, dies aus lat. valvae (Plur.) »die Türflügel, (Flügel)tür«> Sperrwechsel für Linien der gleichen Figur (Thema im Kunstschach); vgl. auch ↑Bivalve …   Das große Fremdwörterbuch

  • valve — (n.) late 14c., one of the halves of a folding door, from L. valva section of a folding or revolving door, lit. that which turns, related to volvere to roll (see VULVA (Cf. vulva)). Sense extended 1610s to membranous fold regulating flow of… …   Etymology dictionary

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