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

  Butterfly \But"ter*fly`\, n.; pl. Butterflies. [Perh. from the
     color of a yellow species. AS. buter-fl[=e]ge,
     buttor-fle['o]ge; cf. G. butterfliege, D. botervlieg. See
     Butter, and Fly.] (Zool.)
     A general name for the numerous species of diurnal
     Lepidoptera.
  
     Note: [See Illust. under Aphrodite.]
           [1913 Webster]
  
     Asclepias butterfly. See under Asclepias.
  
     Butterfly fish (Zool.), the ocellated blenny ({Blennius
        ocellaris) of Europe. See Blenny. The term is also
        applied to the flying gurnard.
  
     Butterfly shell (Zool.), a shell of the genus Voluta.
  
     Butterfly valve (Mech.), a kind of double clack valve,
        consisting of two semicircular clappers or wings hinged to
        a cross rib in the pump bucket. When open it somewhat
        resembles a butterfly in shape.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  butterfly valve
      n 1: a valve in a carburetor that consists of a disc that turns
           and acts as a throttle

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