Introduction

AAV VALVE FOR VENT

AAV Valves are Air admittance valves that deal with the negative pressure building up inside the plumbing systems and prevent the siphonage of traps. Siphonage is filling up of liquid in a container placed in the lower position, thus filling up of the traps.
AAV air admittance valves are installed after the traps in the drain line connections of the fittings like bathtubs, washbasins, urinals, floor drains and ventilation pipes.

AAV vents are classified as special fittings as they have very specialised use and are installed vertically only (straight upward), this is done so because closing of the AAV vent is due to gravity which acts straight vertically downwards.