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Valve Gears

Valve Gears


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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. 1915 Excerpt: ... as shown in Fig. 91, by making the leads and consequently the steam laps unequal. This results, however, in unequal admissions and a larger port opening on one end than on the other. Fig. 92 shows a curve known as the valve ellipse in which the ordinates represent the displacement of the valve from its mid-position and the abscissae the corresponding positions of the piston in its stroke. Positions to the right of mid-position are measured up from the line A-A and positions to the left are measured down. By laying off the amount of movement re quired to draw the valve over the amount of the steam lap, the net port opening and the time when it occurs can be read from the figure. The cut-offs shown in Fig. 90 are represented at the points c and c' in Fig. 92 and the steam laps are shown as s and s'; c is a little later than 1/4 stroke and c' a little earlier than 1/4 stroke. The cut-offs shown in Fig. 91 are represented by the points d and d' in Fig. 92 and the steam laps by Si and s'i; d and d' are both at 1/4 stroke. Thus it is seen from Figs. 90, 91 and 92 that the cut-offs can be equalized by increasing the head end and decreasing the crank end steam laps, but that this is accomplished at the expense of unequal leads and admissions. Fig. 92 further shows that the change of steam laps materially affects the size of the port openings and caused the throttling effect to be greater on the head end than on the crank end. For early cut-offs this will be more noticeable on the cards than for later cut-offs. Measurement of the cards in Fig. 90 shows the area of the head end card to be 112.5% of the area of the crank end card. In Fig. 91 the area of the head end card is only 92% of the area of the crank end card. In the first case the head end is doing more than ...


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Product Details
  • ISBN-13: 9781152099692
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 36
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1152099698
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 82 gr


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