Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . on the dead center, the first function of the valve islead or admission, illustrated by Fig. 14. Owing tothe valve having both lap and lead, the position of thehighest point of the eccentric will be assumed in thiscase to be 1200 ahead of the crank, the position of thelatter being at o°. Exhaust opening has also occurred at the opposite. FIGURE 16. end of the cylinder. The second function is full portopening, Fig. 15, the crank having moved through 60 °and the eccentric is now at 1800, the farthes
Twentieth century hand-book for steam engineers and electricians, with questions and answers .. . on the dead center, the first function of the valve islead or admission, illustrated by Fig. 14. Owing tothe valve having both lap and lead, the position of thehighest point of the eccentric will be assumed in thiscase to be 1200 ahead of the crank, the position of thelatter being at o°. Exhaust opening has also occurred at the opposite. FIGURE 16. end of the cylinder. The second function is full portopening, Fig. 15, the crank having moved through 60 °and the eccentric is now at 1800, the farthest point ofits throw in that direction, the valve being at the endof its travel. At this point it might be well to note a VALVES AND VALVE SETTING 137 matter about which some persons are liable to becomeconfused, simple as it is, viz., that the travel of a slidevalve equals twice the port opening plus twice the out-side lap. For instance, suppose the width of eachsteam port to be \% in. and the outside lap to be I Fig, 15 the valve is at the extreme end of its travel
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