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

  Slide \Slide\, n. [AS. sl[imac]de.]
     1. The act of sliding; as, a slide on the ice.
        [1913 Webster]
  
     2. Smooth, even passage or progress.
        [1913 Webster]
  
              A better slide into their business.   --Bacon.
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     3. That on which anything moves by sliding. Specifically:
        (a) An inclined plane on which heavy bodies slide by the
            force of gravity, esp. one constructed on a mountain
            side for conveying logs by sliding them down.
        (b) A surface of ice or snow on which children slide for
            amusement.
            [1913 Webster]
  
     4. That which operates by sliding. Specifically:
        (a) A cover which opens or closes an aperture by sliding
            over it.
        (b) (Mach.) A moving piece which is guided by a part or
            parts along which it slides.
        (c) A clasp or brooch for a belt, or the like.
            [1913 Webster]
  
     5. A plate or slip of glass on which is a picture or
        delineation to be exhibited by means of a magic lantern,
        stereopticon, or the like; a plate on which is an object
        to be examined with a microscope.
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     6. The descent of a mass of earth, rock, or snow down a hill
        or mountain side; as, a land slide, or a snow slide; also,
        the track of bare rock left by a land slide.
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     7. (Geol.) A small dislocation in beds of rock along a line
        of fissure. --Dana.
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     8. (Mus.)
        (a) A grace consisting of two or more small notes moving
            by conjoint degrees, and leading to a principal note
            either above or below.
        (b) An apparatus in the trumpet and trombone by which the
            sounding tube is lengthened and shortened so as to
            produce the tones between the fundamental and its
            harmonics.
            [1913 Webster]
  
     9. (Phonetics) A sound which, by a gradual change in the
        position of the vocal organs, passes imperceptibly into
        another sound.
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     10. (Steam Engine)
         (a) Same as Guide bar, under Guide.
         (b) A slide valve.
             [1913 Webster]
  
     Slide box (Steam Engine), a steam chest. See under Steam.
        
  
     Slide lathe, an engine lathe. See under Lathe.
  
     Slide rail, a transfer table. See under Transfer.
  
     Slide rest (Turning lathes), a contrivance for holding,
        moving, and guiding, the cutting tool, made to slide on
        ways or guides by screws or otherwise, and having compound
        motion.
  
     Slide rule, a mathematical instrument consisting of two
        parts, one of which slides upon the other, for the
        mechanical performance of addition and subtraction, and,
        by means of logarithmic scales, of multiplication and
        division.
  
     Slide valve.
         (a) Any valve which opens and closes a passageway by
             sliding over a port.
         (b) A particular kind of sliding valve, often used in
             steam engines for admitting steam to the piston and
             releasing it, alternately, having a cuplike cavity in
             its face, through which the exhaust steam passes. It
             is situated in the steam chest, and moved by the
             valve gear. It is sometimes called a D valve, -- a
             name which is also applied to a semicylindrical pipe
             used as a sliding valve.
             [1913 Webster] In the illustration, a is the cylinder
             of a steam engine, in which plays the piston p; b the
             steam chest, receiving its supply from the pipe i,
             and containing the slide valve s, which is shown as
             admitting steam to one end of the cylinder through
             the port e, and opening communication between the
             exhaust passage f and the port c, for the release of
             steam from the opposite end of the cylinder.
             [1913 Webster]

From WordNet (r) 3.0 (2006) :

  slide valve
      n 1: valve that opens and closes a passageway by sliding over a
           port

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