Durgo Air Admittance Valve

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Durgo Air Admittance Valves • for drainage systems • For a drainage system to function optimally it has to be correctly designed and ventilated. • Pressure changes that arise in the system during use could otherwise empty the water • traps and cause bad odours and dampness. Venting is traditionally done by a ventilation • pipe through the roof. When Durgo presented its Air Admittance Valve (AAV) in 1974 • it triggered a revolution in drainage installations the world over. Today the valves are • a natural part of any drainage system. • The valve is installed straight on to the waste pipe, thus avoiding a hole in the roof that • costs time and money, and which could begin to leak and cause damp and other damage • to the building. • The valve opens at negative pressure. This lets air into the system, which equalises • the pressure and stops the water being sucked out of the water traps. At normal • or overpressure the valve is closed and tight, preventing foul air from leaking • out into the building. • https://www.plumbingmall.com/durgo-vent/

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