By American Water Works Association
"Operators, technicians, and engineers will locate the knowledge during this handbook important for gaining a easy figuring out of the use and alertness of air valves. A worthy advisor for choosing, sizing, finding, and fitting air valves in water functions, M51 offers details on air valve forms indexed in AWWA usual C512, most up-to-date version, together with the subsequent: air-release valve; air/vacuum valve; and blend air valve."--BOOK JACKET.Title precis box supplied through Blackwell North the USA, Inc. All Rights Reserved. Read more...
"Operators, technicians, and engineers will locate the data during this guide helpful for gaining a uncomplicated figuring out of the use and alertness of air valves. A necessary advisor for choosing, sizing, finding, and fitting air valves in water purposes, M51 offers details on air valve forms indexed in AWWA usual C512, most up-to-date variation, together with the subsequent: air-release valve; air/vacuum valve; and mix air valve."--BOOK JACKET.Title precis box supplied through Blackwell North the United States, Inc. All Rights Reserved
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Additional info for Air-release, air/vacuum, and combination air valves
Otherwise, air may be delivered into the discharge pipeline when the check valve opens. Uncontrolled air exhaust and the abrupt closure of the airhacuum valves on pump discharge applications can lead t o serious pressure surges. To minimize these water hammer effects, the pump discharge flow rate may be controlled at startup, o r slow-closing devices or air-throttling devices may be incorporated into the airhacuum valve design. These special devices, manufactured for vertical turbine and deep-well pump installations, generally regulate the exhaust rate and closure speed of the airhacuum valve.
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. 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.
All air valves should be opened and flushed at least annually. Filling and Draining Pipelines Caution is required when filling or draining pipelines that have airhacuum or combination air valves installed on the pipeline; see chapter 5. Never prop the valve open by inserting objects into the valve venting port. This can damage the valve seat, and the object may fall into the valve. Inspection Air valves should be inspected at least annually for leakage, and the resilient seats should be replaced as necessary.
Air-release, air/vacuum, and combination air valves by American Water Works Association