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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. 1895 Excerpt: ...A is the valve seat, driven tight into the valve box, the valve being provided in the centre with a boss, into which is secured the spindle B; C is an india-rubber disc, which is prevented from bending too far by the guard H, which is fixed by a nut to the centre spindle B. In this case the surface of the guard H is perfectly straight but at an angle, and the rubber has no lift, it being fastened in the centre between the seat A and the guard H, so that the disc has to bend considerably to allow a full waterway at the periphery of the disc C. In such cases as this the india-rubber breaks very soon round the centre hole, as indicated by the thick line in diagram, Fig. 527, Plate CXXVIII. To prevent the india-rubber disc from breaking at the centre, the disc is allowed to rise a little before it is allowed to bend to the shape of the guard; this design is indicated in sectional elevation, Fig. 528, Plate CXXVIII. It resembles the design, Fig. 525, Plate CXXVIII., except that the guard is raised above the disc C so that the disc has a free lift, and the grid seat A is secured in its place by the centre bolt B and cross bar J. The advantage obtained by giving the disc a free lift consists in that the angle of the guard can be reduced, and consequently the india-rubber disc is not now required to bend so much. If the guard is made curved instead of straight on the under side, it is still less liable to break round the centre; it is more natural, as a disc bends easier in a dish than a cone. A design of this latter description is illustrated in sectional elevation, Fig. 529, and plan, in which the guard and india-rubber disc are removed in the bottom half, in Fig. 530, Plate CXXIX. It will be noticed that in this example the holes in the grid seat A are circular ...


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Product Details
  • ISBN-13: 9781236465641
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 152
  • Spine Width: 8 mm
  • Width: 189 mm
  • ISBN-10: 1236465644
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 286 gr

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