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Valves and Valve-Gearing; A Practical Text-Book for the Use of Engineers, Draughtsmen, and Students

Valves and Valve-Gearing; A Practical Text-Book for the Use of Engineers, Draughtsmen, and Students


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About the Book

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. 1897 Excerpt: ...lever when the wrist plate is in its central position, mark off on the valve circumference the lap and lead; and through the lead point draw the centre line of the valve lever A C. From C as centre, and with the length of the wrist-plate rod as radius, describe an arc cutting the path of the wrist-plate pins in D. Draw the line D H perpendicular to the line joining E and F, the extreme positions of the wrist-plate pin. Then with the lap and lead chosen, the correct position of the eccentric is given by the line J H. The range of trip will be from J F to J H. Should the trip miss, steam will run on to about J K, when the valve will cut-off by virtue of the lap. The exhaust portion of the diagram is shown in position indicating compression at MN and release at M O. These points, in consequence of the small angle of the eccentric, are rather late in the stroke, but unless the lap of the steam valve be improved, this distribution cannot be improved. Increasing the lap means increasing the angle of the eccentric, and, therefore, a reduction of the tripping range. Thus, excellence in one point can only be purchased by defect in another; and herein lies the chief objection to single eccentric gears. In the above instance the lap has been assumed, and the correct position of the eccentric determined from it; but the better method is to fix upon some angle of eccentric, and by reversing the process just described, to find the lap. An angle of 15 has been employed in some cases. This angle gives a fair range of trip--about 37 per cent., whilst compression and release, although somewhat late, are not exceptionally untimed. Clearance Of Catches.--It now becomes necessary to revert to Fig. 90 to consider the movement of the dashpot and trip levers. The length of the tri...


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Product Details
  • ISBN-13: 9781130301144
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 58
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130301141
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 122 gr


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Valves and Valve-Gearing; A Practical Text-Book for the Use of Engineers, Draughtsmen, and Students
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