| 释义 |
ˈpoppet-ˌvalve
Also (earlier) puppet-valve.
[f. puppet n. + valve; in allusion to its movement.]
A disk valve which is opened by being bodily lifted from its seat, not by turning upon a hinge. Earlier called puppet-clack. Hence poppet-valved a.
1829[see puppet-clack]. 1835Amer. Railroad Jrnl. 25 Apr. 245/3 Let the valve be..of the kind called puppet valves. 1874Raymond Statist. Mines & Mining 41 The engines are fitted with puppet-valves and ‘cross variable cut-off’, which is worked by the engineer. 1877Jrnl. Franklin Inst. CIII. 13 These dimensions would have been reduced by the use of the poppet in place of the lantern valve. 1887D. A. Low Machine Draw. (1892) 108 Sketches showing the construction of a conical metal lift or puppet valve and seating. 1890Cent. Dict., Poppet-valve, same as Puppet-valve. 1912Motor Traction 12 Oct. 328/2 The writer has in his possession a list of some 250 poppet-valved engines, together with such data as valve diameters, [etc.]. 1919W. H. Berry New Motoring xvi. 126 The poppet-valved engine, badly made and of unsuitable materials, can be an atrocious production. 1961F. A. S. Brown Nigel Gresley xvii. 122 With poppet valves there is less restriction of steam flow through the ports and consequently less throttling of the steam supply to the cylinders. 1970Railway World Dec. 532 The poppet valves were actuated by a semi-internal form of Walschaerts valve gear. |