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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