Steam engines, prepared in the Extension division of the University of Wisconsin (1919)
Shealy, Edward Marvin · New York, McGraw-Hill · leaf 149
ter. The distance from the insideedges of the ports P and P to the inner edges B and B of the valveis called the inside lap. The inside lap is shown by the dimen-sions I and I. The inside laps of a valve are usually unequal.The width of the ports, or the distance /, is usually the same forboth ends… … Fig. 74. and exhausted past the outer edge, as is sometimes done, theinside lap is called the steam lap and the outside lap is calledthe exhaust lap. The steam lap is usually much greater than theexhaust lap, hence a valve designed for outside admission willnot distribute the steam properly, if it…
Steam-engines
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