valve gear

English

Noun

valve gear (countable and uncountable, plural valve gears)

  1. (mechanical engineering) The mechanism of a steam engine that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle.
    • 1956 April, “"Merchant Navy" Class Pacific Modified”, in Railway Magazine, page 209:
      Three independent sets of Walschaerts valve gear are provided, those for the outside cylinders being driven by return cranks placed on the driving crankpins, and by crosshead arms attached to the crossheads.
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