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The valve-setter's guide; a treatise on the construction and adjustment of the principal valve gearings used on American locomotive (1910)

Kennedy, James, 1848-1922 · New York, A. Sinclair company · leaf 16

An illustration from The valve-setter's guide; a treatise on the construction and adjustment of the principal valve gearings used on American locomotive, 1910, leaf 16
d a certain distance over the steamports, as shown in Fig. 2. This extension of the valve faces iscalled outside lap, or simply lap. It hasthe effect of closing the steam port at acertain distance before the piston reaches the end of the stroke, and this point,which with the variations incident to… … FIGu 2. VALVE WITH OUTSIDE LAP. pleted, the piston is moved on its furthercourse by the expansive power of steam,and when the stroke is completed thesteam in the cylinder having increasedin volume is correspondingly reduced inpressure and when released the loss is notgreat, as the pressure of the…

Locomotives

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