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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   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.

3. AAV - Wikipedia

   en.wikipedia.org/wiki/AAV

   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

4. Talk:Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Talk:Drain-waste-vent_system

   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.

5. Air admittance valve - Wikipedia

   en.wikipedia.org/?title=Air_admittance_valve&...

   Retrieved from "https://en.wikipedia.org/w/index.php?title=Air_admittance_valve&oldid=309883018"

6. Trap (plumbing) - Wikipedia

   en.wikipedia.org/wiki/Trap_(plumbing)

   When a vent cannot be provided, an air admittance valve may be used instead. These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap). These devices avoid negative pressure in the drain pipe by venting room air into the drain pipe (behind the trap).

7. Air-operated valve - Wikipedia

   en.wikipedia.org/wiki/Air-operated_valve

   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.