The steam engine and turbine; a text-book for engineering colleges (1911)
Heck, Robert Culbertson Hays, 1870- · New York, D. Van Nostrand company · leaf 409
ff as indicated on Fig. 253. It willbe noted that the two valves are never simultaneously in mid-position,as they are drawn for illustrative purposes in Fig. 252. (d) Functions of the Cut-off Valve. — It is required of thisvalve that, being out of the way when main-valve admission begins, soas to… … Fig. 253. — Relations of theEccentrics. § 41 (d)] THE DOUBLE-VALVE GEAR. 393 middle of its stroke; consequently, the cut-off valve must have a smalllap if it is to be in rapid motion when closing its port. Very often thelap is negative, or the valve does not cover the ports when in mid-position, as…
Steam-engines · Steam-turbines
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