| 单词 | clackvalve |
| 释义 | > as lemmasclack-valve clack-valve n. see 5. ΘΠ society > occupation and work > equipment > pump > [noun] > valves clap1626 clack1634 clapper1769 butterfly valve1809 suction valve1831 clack-valve1850 shoe-valve1858 butterfly clack1859 trap-valve1877 1850 N. Kingsley Diary 112 Tried the pumps by takeing out the clack valve. 1858 D. Lardner Hand-bk. Nat. Philos.: Hydrostatics, Pneumatics, & Heat (new ed.) 114 The single clack valve is the most simple example of the class. clack-valve a. A form of valve in pumps, etc., consisting of a flap, hinged at one side, covering the aperture, which is opened by the upward motion of the fluid, and closes either by its weight, or by the fluid's backward pressure; often called a clack-valve. ΘΠ society > occupation and work > equipment > pump > [noun] > valves clap1626 clack1634 clapper1769 butterfly valve1809 suction valve1831 clack-valve1850 shoe-valve1858 butterfly clack1859 trap-valve1877 1634 J. Bate Myst. Nature & Art 8 A clacke is a peece of Leather nayled ouer any hole, hauing a peece of Lead to make it lie close, so that the ayre or water in any vessell may thereby bee kept from going out. 1728 J. T. Desaguliers in Philos. Trans. 1726–7 (Royal Soc.) 34 80 An inverted Brass Clack or Valve shutting upwards, and falling down by its own Weight. ?1790 J. Imison School of Arts (ed. 2) 169 A valve or clack, something like a trap-door, to shut downward. 1831 J. Holland Treat. Manuf. Metal I. 161 The lower board [of the] bellows..has a hole with a valve or clack. 1861 W. J. M. Rankine Man. Steam Engine 117 Valves, sometimes called clacks..intended for the purpose of permitting the passage of the fluid only, and stopping its return. < as lemmas |
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