Locomotive breakdown questions answered and illustrated (1907)
Wallace, W. G · Chicago, F. J. Drake & Co. · leaf 186
ap and Inside Clearance.—What isinside lap and inside clearance? Anszver.—Inside lap is the amount that the insideedges of the valve overlap the inside edges of the steamports when the valve is in the center of its seat, and itspuipose is to delay the exhaust or release of steam fromthe cylinder.… … Piston Vaive with Inside Admission, side edges are the exhaust edges. With a piston valvewith outside admission, the edge of the packing ring rep-resents the edge of the valve and the lead and lap aremeasured in the same manner as with a sUde valve. In 178 LOCOMOTIVE BREAKDOWN QUESTIONS a piston…
Locomotives
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