Valve setting: simple methods of setting the plain slide valve. Meyer cut-off. Corliss. and poppet types (1908)
Collins, Hubert Edwin, 1872- · New York [etc.] Hill publishing company · leaf 176
t X. Since the valve opens while traveling up, all the parts mustmove in the direction denoted by the arrows. To overcome the lap, theeccentric would be moved up to X^, and then to give lead the eccentricmust be still further advanced to X-, with the crank still at C. Thisgives the angle at which… … 0* and X^, respectively, or the crank would have reached 90 per cent,of its stroke. It will be noted that the movement of the eccentric is enough to givea travel twice the width of the port and lap of the valve, but that thevalves themselves travel only far enough to overcome the lap and…
Steam-engines
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