Ripper, William, 1853-1937 · London, New York [etc.] : Longmans, Green and co. · leaf 79
uld be necessary for a single port, and the travel of thedouble-ported valve is therefore only half that of the common Aalvefor the same total area of port-opening. The valve is so constructed that, when in the middle of its stroke,each of the four steam-ports is covered by an equal inside… … Fig. 55. the inner admission edges of the valve by passage S, S, cast inthe sides of the valve, passing through from side to side, andcommunicating with the cylinder when the valve uncovers theports. In large engines with a single flat valve the total pressure of thesteam on the back of the valve…
Steam-engines
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