Practical stationary engineering : in form of questions and answers (1909)
West, Andrew Cassius, 1855- · Boston, Mass. : A.C. West · leaf 141
cut-off earlier, the lead is diminished. If theeccentric is ahead, to give the same lead with the greaterlap, we shall have a still earlier cut-off, earlier release andcompression, and an admission as early as it was before.With the eccentric set back, the effect is the valve openslater, giving… … Figure 28. Showing the valve in mid-position,S = steam lap.E = exhaust lap.S. P. = steam ports.E. P, = exhaust ports. ENGINES 129 What is lap on the valve? The term lap on the valve denotes the amount the edgesof the valve extend over the ports when the valve is inthe centre of its travel. If a…
Steam engineering · Steam-engines · Steam-boilers
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