Hutton, Frederick Remsen, 1853- [from old catalog] · New York, J. Wiley & sons; [etc., etc.] · leaf 201
out of theports. The valve must be lengthened in order that it mayclose one port and be still sliding upon its seat while thepiston is moving towards the end of its stroke, and so that itshall just reach the position of opening the new port at theother end as the piston comes to rest at the… … Fig. 129. Lap may be defined as the amount which the valve stand-ing in its central position projects over or laps beyond theouter or steam edge of the port. VALVES AND VALVE-GEARING. 165 86. Effects of the Lap.—The effects of the lap are:I. To compel the steam in the cylinder to work expan-sively,…
Mechanical engineering · Steam power plants
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