Practical Handbook on Pump Construction
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Practical Handbook on Pump Construction

Practical Handbook on Pump Construction


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Purchase of this book includes free trial access to www.million-books.com where you can read more than a million books for free. This is an OCR edition with typos. Excerpt from book: PUMP-VALVES. The most important parts of a pump are its valves; let the design be good in all other respects, the performance of the pump will be seriously affected if the valves are of an unsuitable type, or bad in workmanship and design. A large portion of the power lost in a pump is mostly due to these defects; it is therefore very important that great care should be taken in designing to obviate them, and a careful choice made of the class of valves that are most suitable for the work to be done. The duty of a pump-valve is twofold: Firstly, it should afford an unobstructed passage for the water in one direction; secondly, it should close the passage entirely, and prevent the return in the contrary direction. For a valve to fulfil the first condition, it must not contract the area of its waterway, or in any way obstruct the flow of the water; it must move with the same velocity as the water, and it must be of the same weight as the water it displaces, so as not to cause any resistance to the ascending water. To fulfil the second condition it must be heavy enough to close by its own weight before the pump commences the return stroke, so as to prevent the valve from banging; and it must have very little lift, in order to produce the least amount of slip. It would be useless to advocate the universal adoption of one particular class, as the conditions under which they are employed are so numerous, that a single type would fail to fulfil all the requirements. The number of different valves is legion, but theAuthor will give only a few samples of the best and most commonly used. The oldest valve is probably the metal clack-valve, as it is mentioned and illustrated in Hero's work on Pneumatics, written about the year 200 B.c. The most common is the leather clack-...


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Product Details
  • ISBN-13: 9780217034968
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 0217034969
  • Publisher Date: 08 Jul 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 77 gr


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