This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...of the arrangement. The distance the cut-off blocks must be moved, in this case, in order to vary the point of cut-off to any given amount, may be found by the con. struction in Figs. 181 and 182, the amount the cut-off valves must be moved exactly equalling the amount of increased travel the main valve must have to ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 Excerpt: ...of the arrangement. The distance the cut-off blocks must be moved, in this case, in order to vary the point of cut-off to any given amount, may be found by the con. struction in Figs. 181 and 182, the amount the cut-off valves must be moved exactly equalling the amount of increased travel the main valve must have to cut-off at any point earlier than the longest point of cut-off. It is better, however, to effect the earlier points of cut-off by increasing the main valve travel than it is to move the cut-off valves, because a more free admission of steam is given. Suppose, for example, that the valve, in Fig. 198, had cut-off valves adjustable by a screw, as in Fig. 208, and that the cut-off eccentric being set to cut-off at the same time as the main valve, we move the cut-off valve inch (by means of the screw) wider apart so as to effect the cut-off at halfstroke, and the port openings will be as in Fig. 209, which, on comparison with Fig. 203 for the cut-off at half-stroke by means of increasing the main valve Fig. 210. travel (all the other elements being alike for the two cases), shows the steam admission to be more tardy and the cut-off less sharp. Fig. 210 gives the port openings with the cut-off valves adjusted to cut off at quarterstroke, and compares very unfavorably with Fig. 205, in which the cut-off was effected by increasing the main valve travel, the cases being identical in all other respects, that is to say the dimensions of valve ports, etc., are alike in the two cases. Fig. 211 represents a cut-off valve, which operates on a fixed seat in a steam chest divided into two compartments, a and h. It is obvious that, in this class of valve, the steam that surrounds the main valve in Fig. 212. travel, and if the ports in the cut-off valve ar...
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