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Crossness engines Prince Consort Valve gear

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Uploaded on Sep 17, 2007

A short film showing how the corliss valve gear operates on the worlds biggest rotative beam engine. From the crankshaft, bevel gears rotate a long shaft under the floor. This shaft turns the eccentrics (cams) which in turn operate long shafts in a reciprocating (up and down)motion. These shafts through a pivot operate the valves directly. The upper and lower valves on each cylinder are connected to each other with adjustable linkages. Thereby one pair of eccentrics effectivly operate 4 valves (upper and lower inlets and upper and lower exhausts). The inlet valve can be seen operating in the film. It is identified by its snap shut action, unlike the exhaust valve which is positively controlled though its entire duration.

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