Download PDF by American Water Works Association: Distribution Valves: Selection, Installation, Field Testing

By American Water Works Association

ISBN-10: 1583214305

ISBN-13: 9781583214305

Up to date from the 1996 edtion, this operations handbook offers functional info on picking, fitting, box checking out, and preserving distribution valves in potable water platforms. It covers the main generic values together with globe, butterfly, plug, ball, cone, gate and cost. Unloading, inspection, garage, install, checking out, upkeep, and record-keeping are defined intimately besides the historical past and conception. This guide could be quite usefeul for small and medium sized businesses

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Extra resources for Distribution Valves: Selection, Installation, Field Testing and Maintenance

Sample text

Shop Drawings The buyer may request that the manufacturer provide assembly drawings for all valves delivered. The drawings should include clearance requirements, dimensions, and construction type. They should be sufficiently detailed to show that the valve meets the requirements to comply with standards. Figure 3-1 shows a sample shop drawing. The drawings are especially important when the number of turns, input torque, actuator data, and protective coating are not specified in the standard. A knowledge of the exact number of turns and direction to open or close a valve is essential to prevent actuator failure.

The resilient-seated gate valve has a closure member consisting of a gate that may be encapsulated with a resilient material (rubber, urethane rubber, or others) or may contain a separate resilient seat that seals against the body of the valve and provides a tight seal. ANSI/AWWA C509 also allows designs for which the resilient seat is attached to the body. See Figure 3-1 for a sample shop drawing of a resilient-seated gate valve with an outside stem and yoke. These valves are bidirectional and provide a clear waterway when open.

Installation and Maintenance Manuals Maintenance manuals from the manufacturer should be provided for each significant order and for all valves. The manuals should include specific instructions for assembly, installation, and operation. The manuals should include suggested maintenance procedures for the operation of valves in service. 1-1975 class 125 Working Pressure 200 psi Test Pressure 400 psi 15 16 1 R 17 2 3 18 4 19 5 H Open 20 6 21 H Closed 7 22 8 B 9 4 19 20 23 10 24 11 25 12 13 K E F L D 14 Ref Nos.

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Distribution Valves: Selection, Installation, Field Testing and Maintenance by American Water Works Association


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