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A Text Book of Marine Engineering for the Use of Naval Officers, Marine Engineers, and Students of Marine and Mechanical Engineering

A Text Book of Marine Engineering for the Use of Naval Officers, Marine Engineers, and Students of Marine and Mechanical Engineering


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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. 1896 Excerpt: ...the amount of travel of the slide valve and also to obtain a quicker cut-off and less gradual action, generally slide valves are made double or treble-ported for large engines (figs. 76 and 77). Their action is exactly similar to the single ported valve, but by introducing two or three ports, the quantity of steam admitted can be doubled or trebled, for about the same movement or travel of the valve. The back of large flat valves, is also made flat so that a ring may be fitted Fig. 76. on which the valve can slide. The annular space thus enclosed is connected with the exhaust, and thus instead of the whole pressure of the steam being on one side of the valve only a small portion only is allowed to exert a pressure. These rings are called relief or vacuum rings, and they reduce the working friction considerably. With high pressures piston valves are now fitted, and as will be seen they have not the tendency to create friction in this manner. In fig. 76 is shewn a slide valve in which the vacuum or relief ring form the exhaust pipe, thus saving much space and weight. The method of keeping the ring tight is simple, consisting of ramsbottom rings as in a piston. It was found that the copper or steel flange system produced under various temperatures, unequal pressure on the back of the slide valve, and consequently the piston spring fitting was introduced and gives satisfaction. Small spiral adjusting springs are fitted, so that the! slide valve should not jump off the cylinder face, a common occurrence when these are badly adjusted and under certain conditions of working. To support the weight of the slide valve and rod, balance pistons are also fitted, (see fig. 77). They are pistons working in cylinders placed immediately over the slide valve, in vertical eng...


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Product Details
  • ISBN-13: 9781130051704
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 68
  • Spine Width: 4 mm
  • Width: 189 mm
  • ISBN-10: 1130051706
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 141 gr


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A Text Book of Marine Engineering for the Use of Naval Officers, Marine Engineers, and Students of Marine and Mechanical Engineering
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