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单词	butterfly valve
释义	butterfly valve noun 1 : a valve consisting of two semicircular clappers hinged to a cross rib that permits fluid flow in only one direction 2 : a damper or valve in a pipe consisting of a disk turning on a bisecting axis Example Sentences Recent Examples on the Web The pipe typically features a butterfly valve—which is designed to regulate the flow of liquids or air—that has a rotating disk set on an axis. Daisy Hernandez, Popular Mechanics, 1 Aug. 2019 Word History First Known Use 1809, in the meaning defined at sense 1
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