Meyer Expansion Valve
The best-known design of expansion valve was the Meyer, the invention of French engineer Jean-Jacques Meyer (1804-1877) who applied for a patent on 20 October 1841. A similar valve was patented by James Morris. A second slide valve rides on the back of an adapted main slide valve and is driven by an additional eccentric. In the Meyer valve, the effective length of the expansion valve can be altered with a handwheel whilst the engine is running. The valve has two heads mounted on left- and right-handed threads on the handwheel's valve rod, so that rotating the wheel moves the heads either together or apart. In this arrangement the cut-off is normally controlled manually. Although automatic control was attempted, it was too slow-acting to be effective.
Engines on display at Snibston Discovery Museum and Coleham Pumping Station have Meyer expansion valves.
Read more about this topic: Expansion Valve (steam Engine)
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