Ball valve
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:

  • Ball valve — Ball Ball (b[add]l), n. [OE. bal, balle; akin to OHG. balla, palla, G. ball, Icel. b[ o]llr, ball; cf. F. balle. Cf. 1st {Bale}, n., {Pallmall}.] 1. Any round or roundish body or mass; a sphere or globe; as, a ball of twine; a ball of snow. [1913 …   The Collaborative International Dictionary of English

  • ball valve — n. a valve that works by the action of a ball resting on the outlet hole: use of external pressure raises the ball and opens the hole; when the pressure is removed, the ball drops and closes the hole …   English World dictionary

  • ball valve — ball′ valve n. mac a plumbing valve that regulates the flow of a fluid by means of a ball that moves into or out of the valve opening • Etymology: 1830–40 …   From formal English to slang

  • Ball valve — A ball valve (like the butterfly valve and plug valve are one of the family of valves called quarter turn valves ) is a valve that opens by turning a handle attached to a ball inside the valve. The ball has a hole, or port, through the middle so… …   Wikipedia

  • ball valve — noun any valve that checks flow by the seating of a ball • Hypernyms: ↑valve * * * noun 1. : a valve in which a ball fits into a spherical seat and regulates the aperture by its rise and fall due to fluid pressure, to a spring, or to its own… …   Useful english dictionary

  • ball valve — rutulinis vožtuvas statusas T sritis automatika atitikmenys: angl. ball valve vok. Kugelventil, n rus. шаровой клапан, m pranc. soupape à bille, f; soupape à boulet, f …   Automatikos terminų žodynas

  • ball valve — valve in which a small ball regulates pressure …   English contemporary dictionary

  • ball valve — Mach. 1. a valve controlling flow by means of a ball pierced with an opening in one direction and fixed to rotate on a spindle at right angles to the opening. 2. any valve that checks flow by the seating of a ball. [1830 40] * * * …   Universalium

  • ball valve — noun Date: 1839 a valve in which a ball regulates the aperture especially by its rise and fall due to fluid pressure, a spring, or its own weight …   New Collegiate Dictionary

  • ball valve — noun a one way valve opened and closed by pressure on a ball which fits into a cup shaped opening …   English new terms dictionary

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