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

By American National Standards Institute.; American Water Works Association

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

Sample text

The valve box should be installed so as not to transmit loads or stress to the valve, valve stem, or piping system. The valve box should be centered over the operating nut of the valve with the box cover flush with the surface of the finished area or another level as directed by the purchaser. Valve boxes should be designed so that a traffic load on the top of the box is not transmitted to the valve stem or piping system. 3 Valves buried in unusually deep trenches have special provisions for operating the valve.

If the actuator has a torque-limiting device, it should be set below the values in Sec. 5. If there is no torque-limiting device, the recommended practice is to stop the power actuator three or four turns before the valve is fully opened or fully closed and complete the operation manually. 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.

During outside storage, they should be protected from the weather, sunlight, ozone, and foreign materials. In colder climates where valves may be subject to freezing temperatures, it is absolutely essential to prevent water from collecting in the valves. Failure to do so may result in a cracked valve casting or deterioration of the resilient seat material. 5: INSTALLATION Instructions supplied by manufacturers should be reviewed in detail before valves are installed. At the job site prior to installation, each valve should be visually inspected and a n y foreign material in the interior portion of the valve should be removed.

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