| 单词 | butterfly clack |
| 释义 | > as lemmasbutterfly clack ΘΚΠ society > occupation and work > equipment > pump > [noun] > valves clap1626 clack1634 clapper1769 butterfly valve1809 suction valve1831 clack-valve1850 shoe-valve1858 butterfly clack1859 trap-valve1877 1859 W. J. M. Rankine Man. Steam Engine ii. iv. 123 A pair of flap valves placed hinge to hinge (usually made of one piece of leather fastened down in the middle) constitute a ‘butterfly clack’. 1913 Power 12 Aug. 243/2 Sometimes they are made of one piece of leather fastened down in the middle and often known in English practice as a ‘butterfly clack’. < as lemmas |
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