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2 definitions found
 for Check valve
From The Collaborative International Dictionary of English v.0.48 :

  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. (Zool.) 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]

From The Collaborative International Dictionary of English v.0.48 :

  Check \Check\ (ch[e^]k), n. [OE. chek, OF. eschec, F. ['e]chec,
     a stop, hindrance, orig. check in the game of chess, pl.
     ['e]checs chess, through Ar., fr. Pers. sh[=a]h king. See
     Shah, and cf. Checkmate, Chess, Checker.]
     1. (Chess) A word of warning denoting that the king is in
        danger; such a menace of a player's king by an adversary's
        move as would, if it were any other piece, expose it to
        immediate capture. A king so menaced is said to be in
        check, and must be made safe at the next move.
        [1913 Webster]
  
     2. A condition of interrupted or impeded progress; arrest;
        stop; delay; as, to hold an enemy in check.
        [1913 Webster]
  
              Which gave a remarkable check to the first progress
              of Christianity.                      --Addison.
        [1913 Webster]
  
              No check, no stay, this streamlet fears.
                                                    --Wordsworth.
        [1913 Webster]
  
     3. Whatever arrests progress, or limits action; an obstacle,
        guard, restraint, or rebuff.
        [1913 Webster]
  
              Useful check upon the administration of government.
                                                    --Washington.
        [1913 Webster]
  
              A man whom no check could abash.      --Macaulay.
        [1913 Webster]
  
     4. A mark, certificate, or token, by which, errors may be
        prevented, or a thing or person may be identified; as,
        checks placed against items in an account; a check given
        for baggage; a return check on a railroad.
        [1913 Webster]
  
     5. A written order directing a bank or banker to pay money as
        therein stated. See Bank check, below.
        [1913 Webster]
  
     6. A woven or painted design in squares resembling the patten
        of a checkerboard; one of the squares of such a design;
        also, cloth having such a figure.
        [1913 Webster]
  
     7. (Falconry) The forsaking by a hawk of its proper game to
        follow other birds.
        [1913 Webster]
  
     8. Small chick or crack.
        [1913 Webster]
  
     Bank check, a written order on a banker or broker to pay
        money in his keeping belonging to the signer.
  
     Check book, a book containing blank forms for checks upon a
        bank.
  
     Check hook, a hook on the saddle of a harness, over which a
        checkrein is looped.
  
     Check list, a list or catalogue by which things may be
        verified, or on which they may be checked.
  
     Check nut (Mech.), a secondary nut, screwing down upon the
        primary nut to secure it. --Knight.
  
     Check valve (Mech.), a valve in the feed pipe of a boiler,
        or other conduit, to prevent the return of the feed water
        or other fluid.
  
     To take check, to take offense. [Obs.] --Dryden.
  
     Syn: Hindrance; setback; interruption; obstruction;
          reprimand; censure; rebuke; reproof; repulse; rebuff;
          tally; counterfoil; counterbalance; ticket; draft.
          [1913 Webster]

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