![]() ![]() The walschaerts valve gear is a type of valve gear invented by belgian railway mechanical engineer egide walschaerts in 1844 used to regulate the flow of steam to the pistons in steam locomotives. Steam Engine, Twin Cylinder with Joy Valve Gear (no from The original drawings were published in the the model engineer and electrician magazine of march and april 1905 under the heading a model horizontal engine with joys valve gear by h. Stephenson valve gear, the joint invention of williams and howe in 1842, was first applied to locomotives by robert stephenson co, and is still in use throughout the world. ![]() Valve gear is that the caprotti poppet valves, even when only partially open, present little resistance to the steam as it passes through them, whereas the more conventional gears such as walschaerts or stephensons open slowly and throttle the steam entering the cylinder, thereby dissipating the energy in the steam.
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