| 单词 | crown valve |
| 释义 | > as lemmascrown valve crown valve n. Engineering a valve in which a curved cover lies over an outlet in such a way that steam or other fluid can enter the outlet only when this cover is raised above its seat. ΚΠ 1841 J. S. Russell Treat. Steam-engine 168 The last valve which we shall describe is the crown-valve, or equilibrium-valve, which is in use on the Cornish engine, and has also been introduced into rotative engines. 1920 D. S. Beyer Industr. Accident Prevention (new ed.) xi. 79 When a boiler is taken off the line, the crown valve, feed-water, and blow-off valves should be locked. 2003 K. J. Moss Heating & Water Services Design in Buildings (ed. 2) v. 116 Steam is generated from water within the boiler under its own pressure with the crown and isolating valves closed until steam is present and the required operating pressure is reached. < as lemmas |
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