Valve seat

Valve seat
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.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Valve seat — The valve seat in an internal combustion gasoline or diesel engine is the surface against which an intake or an exhaust valve rests during the portion of the engine operating cycle when that valve is closed. The valve seat is a critical component …   Wikipedia

  • valve seat — noun : a circular ring of heat resistant bronze or steel on which a valve of an internal combustion engine rests when closed * * * valve seat, the rim of the valve port on which the valve rests when closed, made of specially hardened steel… …   Useful english dictionary

  • valve seat insert — A hardened steel valve seat that may be removed and replaced. The use of valve seat inserts dispenses with the need for lead in the fuel to act as a lubricant between the valve head and seat Also see insert …   Dictionary of automotive terms

  • valve seat ring — A ring shaped insert of a harder metal than that of the cylinder head; the use of valve seat inserts dispenses with the need for lead in the fuel to act as a lubricant between the valve head and seat …   Dictionary of automotive terms

  • valve seat face — An annular part of a valve head located at the valve seat of the cylinder head …   Dictionary of automotive terms

  • valve seat grinding — Renewing the valve seat area by grinding with a stone mounted upon a special mandrel …   Dictionary of automotive terms

  • valve seat — The area onto which the face of the poppet seats when closed. The two common angles for this seat are forty five and thirty degrees …   Dictionary of automotive terms

  • valve seat cutter — A special automotive tool with carting blades for use with power tools; used to cut worn valve seats with 30° or 45° angles …   Dictionary of automotive terms

  • 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 …   The Collaborative International Dictionary of English

  • valve box — 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… …   The Collaborative International Dictionary of English

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”