It was not yet time to start the engine, but Croly sprang to the valve-gear to let on the steam.
One form of valve-gear is the link motion invented by Stephenson.
Any device by which a steam-engine operates the valves which admit steam to the cylinder is called "valve-gear."
The devices for controlling the steam are the throttle-valve and the valve-gear.
The valve-gear of this engine, a view of which is given in Fig. 27, was quite similar to that used on the Watt pumping-engine.
The valve-gear and the feed-pumps were worked from the engine-shaft.
The valve-gear is the Stephenson link, as in the ordinary engine.
The blast was secured by a fan, and the valve-gear was worked by cams instead of eccentrics.
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.
The joints of the valve-gear consist of pins turning in solid ferrules in the rod-ends, both hardened and ground.