Download AWWA standard for reduced-wall, resilient-seated gate valves by American National Standards Institute.; American Water Works PDF

By American National Standards Institute.; American Water Works Association

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Extra resources for AWWA standard for reduced-wall, resilient-seated gate valves for water supply service

Sample text

The test pressure should not exceed the rated working pressure of the valve. After the test, steps should be taken to relieve any trapped pressure in the body of the valve. The resilient-seated gate valve should not be operated in either the opening or closing direction at differential pressures above the rated working pressure. It should be noted that valves seat better at or near the rated working pressure of the valve. In addition, wear or foreign material may damage valve seating surfaces and may cause leakage (See AWWA C600).

1 During installation, there is the possibility of foreign materials inadver- tently entering the valve. Foreign material can damage internal working parts during Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Licensee=Earth Tech Inc/5906698001, User=Yanez, Simon Not for Resale, 05/08/2008 13:27:26 MDT O REDUCED-WALL, RESILIENT-SEATED GATE VALVES 21 operation of the gate valve. For this reason, gate valves should be installed in the closed position.

Maintenance should be performed at the time a malfunction is discovered to avoid a return trip to the same valve or to prevent neglecting it altogether. A recording system should be adopted that provides a written record of valve location, condition, maintenance, and each subsequent inspection of the valve. Copyright American Water Works Association Provided by IHS under license with AWWA No reproduction or networking permitted without license from IHS Licensee=Earth Tech Inc/5906698001, User=Yanez, Simon Not for Resale, 05/08/2008 13:27:26 MDT 24 AWWA C515-O1 Sec.

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