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1. Oxford American Dictionary

   butterfly valve

   • IPA[ˈbədərˌflī valv]

   • n.
     a valve consisting of a disk rotating on an axis across the diameter of a pipe to regulate the flow, as in the throttles of many engines.；a valve consisting of a pair of semicircular plates that are attached to a spindle across a pipe and hinged to allow flow only one way.

   • noun: butterfly valve, plural noun: butterfly valves

2. • 更多解釋

   butterfly valve

   • n.
     a valve consisting of a rotating circular plate or a pair of hinged semicircular plates, ...

   Oxford Dictionary