Stephenson's link motion

Stephenson link motion


Each slide valve is equipped with two eccentrics, one for ahead and another for astern. By shifting the position of a quadrant you can get one or the other of the eccentric rods to operate the slide valve rod.
A steamer with Stephenson link motion have the slide valves placed at the engines ends and/or between the cylinders and therefore the engine is longer than if it had had horizontal eccentric rods. Stephenson's valve-gear Stephenson link-motionSteamship with Stephenson link motion