By American Water Works Association
This handbook courses operators within the choice, set up, and upkeep of air valves in ingesting water provide purposes. insurance comprises air valve varieties, valve position, valve orifice sizing, water hammer, set up, operation, defense, and upkeep.
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Extra resources for Air-Release, Air/Vacuum & Combination Air Valves
Always ventilate the underground structure and use a combustible gas and low-oxygen detector before entering the structure. Consult Occupational Safety and Health Administration rules and procedures, such as the need for harnesses and ground-level supervision, in all underground work. Inspection When inspecting air valves, isolate the valve by closing the shutoff valve before putting hands and fingers into the valve outlet. If the air valve should suddenly close, hands or fingers could be injured or lost.
19 mm or 13 mml diameter) can be installed on the valve body t o release water and reduce the possibility of damage from freezing. 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.
If the air valve should suddenly close, hands or fingers could be injured or lost. Pressurized air can also be trapped between the shutoff valve and the air valve; therefore, any removal of air valve bolts, plugs, or covers must be done with extreme care to release trapped air slowly and prevent serious injury. Pipe1ine Fi I I ing Thread protectors and packing material should be removed from air valves prior to filling the pipeline. Copyright (C) 2001 American Water Works Association All Rights Reserved Bibliography Kroon, Joseph R.