Practical instructor and reference book for locomotive firemen and engineers: a practical treatise .. (1916)
Lockhart, Charles F. (Charles Fulton), b. 1872 · New York, The Norman W. Henley publishing co. · leaf 63
60 LAP valve packing rings from catching on the edges of theports as the valve moves over them. LAP 202. When speaking of lap, as applied to the valvesof a locomotive, we mean that part of the valve which … Fig. 6.—Piston Valve and Arrangement of Ports in Steam Chest. laps over or extends beyond the edges of the ports whenthe valve is central on its seat. 203. Lap is used for the purpose of cutting off theadmission of live steam to the cylinder when the pistonhas only completed a part of its stroke.…
Locomotives
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