valve gear

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noun

(in a reciprocating engine) the mechanism for opening and closing the valves at certain points in each stroke.

Also called valve train.
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British Dictionary definitions for valve gear

valve gear

noun

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