The steam engine and turbine; a text-book for engineering colleges (1911)
Heck, Robert Culbertson Hays, 1870- · New York, D. Van Nostrand company · leaf 437
Fig. 285. — Valve Gear of Duplex Steam Pump. presently move to the right, valve A must move to the right ahead ofit, wherefore valve A must have a movement opposite to that of pistonB. Following through the other three critical positions, and notingthe directions of movement as indicated by arrows,… … Fig. 286. — Valve Movement in the Duplex Pump. Although moved by the pistons, the valves are not closely driven,but there is always some lost motion between the rock levers and thevalves. In Fig. 285 this clearance or back-lash is permitted at the nutson the valve rod, on each side of the valve; on…
Steam-engines · Steam-turbines
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