The Walschaerts valve gear, known as Heusinger valve gear in parts of Europe, is a type of valve gear used to regulate the flow of steam to the pistons in steam locomotives, invented by Belgian railway engineer Egide Walschaerts in 1844. The gear is sometimes named without the final "s", since it was incorrectly patented under that name. It was extensively used in steam locomotives from the late 19th century until the end of the steam era.
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- 👉 Valve gear in the context of Walschaerts valve gear
- Valve gear in the context of Gresley conjugated valve gear
Valve gear in the context of Gresley conjugated valve gear
The Gresley conjugated valve gear is a valve gear for steam locomotives designed by Sir Nigel Gresley, chief mechanical engineer of the LNER, assisted by Harold Holcroft. It enables a three-cylinder locomotive to operate on with only the two sets of valve gear for the outside cylinders, and derives the valve motion for the inside cylinder from them by means of levers (the "2 to 1" or "conjugating" lever and the "equal" lever). The gear is sometimes known as the Gresley-Holcroft gear, acknowledging Holcroft's major contributions to its development.
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