Domestic Sanitation and Plumbing; Water Supply Domestic Hot-Water Services Warming and Ventilation of Buildings Volume 2

Domestic Sanitation and Plumbing; Water Supply Domestic Hot-Water Services Warming and Ventilation of Buildings Volume 2

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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. 1911 edition. Excerpt: ... P. It is often necessary to arrange a secondary circulation in connection with a system having the cylinder on the first floor. The latter condition should be avoided where possible; it is not so satisfactory as that shown in Pig. 119. Pig. 120 shows the pipe routes for the primary and secondary circulation where the cylinder is fixed on the first floor. It will be observed that the secondary return joins the primary return, and that the pipe rises from the junction to the air pipe on the top of the cylinder. The pipes marked X are branches to fittings. It is necessary to insert a reflux or back-pressure valve at A to prevent the cold water from the primary return pipe entering the secondary return when the two lower branches are discharging water. This device is also necessary to retain the water in the cylinder when the cold supply is shut off and the hot supply taps are opened. If this precaution be omitted, the two branches on the secondary return will deliver a mixture of hot and cold water owing to a temporary reversal of the current in this pipe when the taps are opened. Under the best conditions reflux valves fixed in such positions are liable to failure, which may cause a stoppage of the secondary movement, or may allow cold water to be delivered at XX. Fio. 120.--Cylinder on First Floor with Secondary Return. Fig. 121 shows a part section through a reflux valve. The flap is usually made of copper, and is loosely hinged over a ground face of gunmetal. Heavy flaps should not be used, as they retard the flow of water, and often are responsible for a total stoppage of the same. In systems where hot supplies are fixed on the second and upper floors, the ordinary method of secondary circulation is inadequate to give a full delivery to each...show more

Product details

  • Paperback | 92 pages
  • 189 x 246 x 5mm | 181g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236574419
  • 9781236574411