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. 1914 Excerpt: ... trouble alarm. In case a small stick, stone or other obstruction should lodge on the seat of the check and hold it open no alarm or trouble signal would probably be given. In case a sprinkler opened, the water to feed it would flow through the main check instead of through the Venturi by-pass. In other types of valves ...
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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. 1914 Excerpt: ... trouble alarm. In case a small stick, stone or other obstruction should lodge on the seat of the check and hold it open no alarm or trouble signal would probably be given. In case a sprinkler opened, the water to feed it would flow through the main check instead of through the Venturi by-pass. In other types of valves the wedging open of the check valve in this way will cause a continuous alarm until the trouble is remedied and no failure in case of fire would result. To reduce the possibility of such trouble to a minimum a quarter-inch test pipe is installed just above the main check. This can be used to make a final test after there has been a flowage of water through the system. If the alarms will operate with this quarterinch test pipe open, it is safe to assume that the main check is on its seat or at least there is not enough obstruction under it to cause trouble. Another feature which is liable to cause trouble is the possible leakage of mercury at the gage joints, although this has now been well guarded against. The time element in this valve depends upon the size of the orifice through which the mercury has to pass in flowing from one chamber to the other. This orifice is wedge shaped so that the mercury flows back a little faster than it flows in. Reported upon by the Underwriters' Laboratories in 1909. Features criticized: 1. Unreliability of alarm at rates of flow around 300 gallons per minute. 2. Danger of clogging of mercury column. 3. Danger of mercury leakage. 4. Susceptibility to misadjustment. 5. Effects of water eddies at inlet. 6. Inaccessibility of main valve seat. 7. Liability of failure to send in alarm if check is not tightly seated. In June, 1912, the following criticism was also made. Liability to false alarms. A large number have...
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New. Sewn binding. Cloth over boards. 476 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
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Fine. Sewn binding. Cloth over boards. 476 p. In Stock. 100% Money Back Guarantee. Brand New, Perfect Condition, allow 4-14 business days for standard shipping. To Alaska, Hawaii, U.S. protectorate, P.O. box, and APO/FPO addresses allow 4-28 business days for Standard shipping. No expedited shipping. All orders placed with expedited shipping will be cancelled. Over 3, 000, 000 happy customers.