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The double beat Cornish valves on the Lilleshall engine are positioned between the cylinders. The valves and their seats are of gunmetal, the latter being bolted into the valve casing and can be fairly easily removed for re-machining of the faces. Each pair of inlet valves are individually connected to a common steam main running between the cylinders below floor level. Each pair of exhaust valves is connected to an exhaust main running alongside each cylinder below floor level.
As designed, valve closing was by gravity but later the inlets were assisted by a spring fastened between one of the metallic packing bolts and the trip die housing. The final lowering onto the valve seats was controlled by pneumatic dash-pots with the inlet ones having an external tap to adjust the rate.
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