valve gear

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

Also called valve train.

Words nearby valve gear

The youth reached the valve-gear at the same time, and the hands of both grasped the wheel.

Golden Days for Boys and Girls, Vol. XIII, Nov. 28, 1891 |Various
H B is proportional to the lift of the valve, and O H to the motion of the valve-gear when out of contact with the valve-lifters.

A History of the Growth of the Steam-Engine |Robert H. Thurston
The blast was secured by a fan, and the valve-gear was worked by cams instead of eccentrics.

A History of the Growth of the Steam-Engine |Robert H. Thurston
It was not yet time to start the engine, but Croly sprang to the valve-gear to let on the steam.

Golden Days for Boys and Girls, Vol. XIII, Nov. 28, 1891 |Various

Any device by which a steam-engine operates the valves which admit steam to the cylinder is called "valve-gear."

The Story of Great Inventions |Elmer Ellsworth Burns

valve gear

a mechanism that operates the valves of a reciprocating engine, usually involving the use of cams, pushrods, rocker arms, etc