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 for Stop valve
From The Collaborative International Dictionary of English v.0.48 :

  Stop \Stop\, n.
     1. The act of stopping, or the state of being stopped;
        hindrance of progress or of action; cessation; repression;
        interruption; check; obstruction.
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              It is doubtful . . . whether it contributed anything
              to the stop of the infection.         --De Foe.
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              Occult qualities put a stop to the improvement of
              natural philosophy.                   --Sir I.
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              It is a great step toward the mastery of our desires
              to give this stop to them.            --Locke.
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     2. That which stops, impedes, or obstructs; as obstacle; an
        impediment; an obstruction.
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              A fatal stop traversed their headlong course.
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              So melancholy a prospect should inspire us with zeal
              to oppose some stop to the rising torrent. --Rogers.
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     3. (Mach.) A device, or piece, as a pin, block, pawl, etc.,
        for arresting or limiting motion, or for determining the
        position to which another part shall be brought.
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     4. (Mus.)
        (a) The closing of an aperture in the air passage, or
            pressure of the finger upon the string, of an
            instrument of music, so as to modify the tone; hence,
            any contrivance by which the sounds of a musical
            instrument are regulated.
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                  The organ sound a time survives the stop.
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        (b) In the organ, one of the knobs or handles at each side
            of the organist, by which he can draw on or shut off
            any register or row of pipes; the register itself; as,
            the vox humana stop.
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     5. (Arch.) A member, plain or molded, formed of a separate
        piece and fixed to a jamb, against which a door or window
        shuts. This takes the place, or answers the purpose, of a
        rebate. Also, a pin or block to prevent a drawer from
        sliding too far.
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     6. A point or mark in writing or printing intended to
        distinguish the sentences, parts of a sentence, or
        clauses; a mark of punctuation. See Punctuation.
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     7. (Opt.) The diaphragm used in optical instruments to cut
        off the marginal portions of a beam of light passing
        through lenses.
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     8. (Zool.) The depression in the face of a dog between the
        skull and the nasal bones. It is conspicuous in the
        bulldog, pug, and some other breeds.
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     9. (Phonetics) Some part of the articulating organs, as the
        lips, or the tongue and palate, closed
        (a) so as to cut off the passage of breath or voice
            through the mouth and the nose (distinguished as a
            lip-stop, or a front-stop, etc., as in p, t, d, etc.),
        (b) so as to obstruct, but not entirely cut off, the
            passage, as in l, n, etc.; also, any of the consonants
            so formed. --H. Sweet.
            [1913 Webster]
     Stop bead (Arch.), the molding screwed to the inner side of
        a window frame, on the face of the pulley stile,
        completing the groove in which the inner sash is to slide.
     Stop motion (Mach.), an automatic device for arresting the
        motion of a machine, as when a certain operation is
        completed, or when an imperfection occurs in its
        performance or product, or in the material which is
        supplied to it, etc.
     Stop plank, one of a set of planks employed to form a sort
        of dam in some hydraulic works.
     Stop valve, a valve that can be closed or opened at will,
        as by hand, for preventing or regulating flow, as of a
        liquid in a pipe; -- in distinction from a valve which is
        operated by the action of the fluid it restrains.
     Stop watch, a watch the hands of which can be stopped in
        order to tell exactly the time that has passed, as in
        timing a race. See Independent seconds watch, under
        Independent, a.
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     Syn: Cessation; check; obstruction; obstacle; hindrance;
          impediment; interruption.
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