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A valve which uses a hollow or double pistonsliding in a cylinder to direct fluid along one of two paths
1898, “A Plea for the Piston Valve”, in Bulletin of the International Railway Congress Association, volume 12:
We already know that a balanced slide valve requires about half as much power to move it as an unbalanced valve, but the piston valve requires only about half as much as the balanced valve.
1944 November and December, “Conversion of L.N.E.R. "B16" Class 4-6-0 Locomotives”, in Railway Magazine, page 349:
The three cylinders of these engines are 18½ in. dia. by 26 in. stroke; and as the three piston valves were all between the frames, it resulted in the monoblock casting being weak, so far as the centre cylinder was concerned, with the result that the life of these castings left a good deal to be desired.
2009, Mark C. Ely, Amy E. Van Deuren, Wind Talk for Brass, Types of Valves:
Piston valves move up and down by means of a spring lining up holes or wind ways in the piston with holes in additional lengths of tubing.
