valve gear
noun
: any of numerous gears by which motion is given to the valves of an engine and especially a steam engine
specifically
: such a gear for a steam engine by which the cutoff may be varied while the engine is running and the engine started, stopped, or reversed
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“Valve gear.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/valve%20gear. Accessed 28 Nov. 2024.
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