Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 81
e valve itself, PV, consists of a double piston,the width of the pistons being the same as the width of face in anordinary flat slide-valve, and being sufiicient to cover the port whenin mid-position, and to provide the necessary lap. The valve works in two short bushes or barrels, B, in… … Fig. 58. series of openings separated by bars instead of a continuous circularport, enables the spring rings, with which the larger types of piston-valves are fitted, to work to and fro over the port without catchingon the edge. The steam enters as shown ; it passes to either end ofthe…
Steam-engines
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