valve gear

(in a reciprocating engine) the mechanism for opening and closing the valves at certain points in each stroke.
Also called valve train. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
valve gear
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 10th Edition
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