American Water Works Association's Air-Release, Air/Vacuum & Combination Air Valves PDF

By American Water Works Association

This guide publications operators within the choice, deploy, and upkeep of air valves in ingesting water provide functions. assurance comprises air valve forms, valve situation, valve orifice sizing, water hammer, set up, operation, defense, and upkeep.

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Additional resources for Air-Release, Air/Vacuum & Combination Air Valves

Sample text

The relief valve automatically opens when the water temperature in the valve falls below a set point (typically 35°F [ Z O C l ) and recloses at higher temperatures. Contamination Valves with top-threaded openings should be protected with a protective cap, U-bend, or elbow to prevent rocks, sand, and other particles from falling into the valve. To protect air valves with large metal hoods covering the valve discharge opening from rodents and bird nests, a heavy screened cage covering the air valve outlet should be used.

Valves Located Aboveground Aboveground air valves should be protected from freezing, contamination, or vandalism. Valves Located Belowground In addition to the protection from freezing, contamination, and vandalism, air valves located belowground should also be provided with a proper valve vault. 1 Air Valve Shutoff Valve Pipeline Riser Figure 6-1 Pipeline installation of an air-release valve Copyright (C) 2001 American Water Works Association All Rights Reserved INSTALLATION, OPERATION, MAINTENANCE, AND SAFETY 29 Valve Vault A valve vault should have adequate screened ventilation to satisfy the air requirements for the valve and ventilation of the structure as shown in Figure 6-2.

Screened Vents -T U Air-Release Precast Manhole ____ \ AirNacuum Valve Pipeline Connection \ Drain % Figure 6-2 Vault installation of a combination air valve Copyright (C) 2001 American Water Works Association All Rights Reserved 30 AIR-RELEASE, AIFUVACUUM, AND COMBINATION AIR VALVES Flooding Flooding submerges the air intake of air valves, prevents the proper operation of the valve, and may introduce contamination into the pipeline. An outside air intake piped directly to the air valve may help prevent contamination of the pipeline.

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