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valve gear

noun
1.
(in a reciprocating engine) the mechanism for opening and closing the valves at certain points in each stroke.
Also called valve train.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for valve-train

valve gear

noun
1.
a mechanism that operates the valves of a reciprocating engine, usually involving the use of cams, pushrods, rocker arms, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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