| 单词 | butterfly valve |
| 释义 | > as lemmasbutterfly valve butterfly valve n. †(a) a pair of flap valves consisting of a single piece of flexible material (typically leather) fastened down in the middle to form a hinge (obsolete); (b) a valve that is opened and closed by the rotation of a rigid disc having a spindle running through its centre. ΘΚΠ society > occupation and work > equipment > pump > [noun] > valves clap1626 clack1634 clapper1769 butterfly valve1809 suction valve1831 clack-valve1850 shoe-valve1858 butterfly clack1859 trap-valve1877 1809 W. Nicholson Brit. Encycl. III. at Hydraulics The butterfly-valve..varies from the two former, in having two semicircular flaps appended by hinges to a bar passing over the centre of the excavated piston. 1889 W. J. Baldwin Hot-water Heating & Fitting xxv. 328 Nothing but a gate valve should be tolerated in the main pipes of an apparatus unless it is a butterfly valve of good design. 1911 A. M. Greene Pumping Machinery vi. 289 A double clack valve..is sometimes called a butterfly valve. 2003 New Yorker 1 Sept. 98/1 ‘They're called butterfly valves’, he said of the sluices inside the cylinder. < as lemmas |
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