By American Water Works Association
This operations handbook offers info at the layout, choice, set up, trying out, and upkeep of distribution valves utilized in potable water structures. All normal water distribution valves are defined and illustrated intimately, together with globe, butterfly, plug, ball, cone, gate, and fee valves. The handbook describes industry-approved practices for delivery, inspection, garage, install, trying out, and upkeep of distribution valves and contains pattern upkeep checklist kinds, word list, and bibliography.
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Additional resources for Distribution Valves - Selection, Installation, Field Testing, and Maintenance
Support piping systems and align components to minimize bending at the valve connections. 2. Install valves in the closed position to prevent any foreign material from entering the valve. 3. Place the valve on firm footing in the trench t o prevent settling. 4. Install the valve in alignment with the pipe t o prohibit excessive strain on the connection t o the pipe. Preventing any strain on the connection is critical in flanged installations. Flange fracture can result from unequal strains set up by improper makeup and tightening of the joints.
Working through network in geographical order 45 Operation test 27 28 P Packaging 30 Pinch valves 15 Piston valves 11 Plant valve tests 27 Plug valves 12 eccentric 16f. 13f. 13 Pneumatic operators 6 Pressure reducing valves 21 Pressure relief valves 21 21f. S Sealing mechanisms 6 metal 6 7 sealants 6 7 soft 6 7 Seat test 28 This page has been reformatted by Knovel to provide easier navigation. Copyright (C) 2006 American Water Works Association All Rights Reserved Index Terms Links Shell test 28 Shop drawings 28 Special-purpose valves 19 Standards 27 ball valves 15 butterfly valves 12 metal-seated gate valves 17 organizations 27 29f.
Other agencies have crews that provide either a combination of these services or all of them during the course of their assigned work. Some valve crews have been known to operate valves in a particular area for three days and provide maintenance the other two. It is important to reiterate that all distribution valves be exercised or operated on a periodic basis to maintain the reliability of their service. If properly operated, most valves tend to require less maintenance and have been known to last a long time.
Distribution Valves - Selection, Installation, Field Testing, and Maintenance by American Water Works Association
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