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Air admittance valves (AAVs, or commonly referred to in the UK as Durgo valves and in the US as Studor vents and Sure-Vent®) are negative-pressure-activated, one-way mechanical valves, used in a plumbing or drainage venting system to eliminate the need for conventional pipe venting and roof penetrations.
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The "Venting to atmosphere" section is great! Of course, diagrams and picutres would make it even better... But the "Air admittance valve" section does not make sense -- if it only allows gases in, not out, how does it prevent back-pressure when a toilet flushes?69.87.193.156 13:05, 6 September 2006 (UTC) It doesn't.
Air admittance valve, a valve in a drain-waste-vent system; Aire d'attraction d'une ville, a metropolitan statistical area used by the French national statistics office INSEE; Another Angry Voice, a British political blog; Vatican Apostolic Archive, Latin: Archivum Apostolicum Vaticanum
Pages in category "Air valves" ... Schrader valve; Slide check This page was last edited on 11 October 2019, at 19:16 (UTC). Text is available under the ...
An air-operated valve, also known as a pneumatic valve, is a type of power-operated pipe valve that uses air pressure to perform a function similar to a solenoid. As air pressure is increased, the compressed air starts to push against the piston or diaphragm walls which causes the valve to actuate.