How AAVs work
The STUDOR Air Admittance Valves (AAVs) open and admit fresh air when negative pressure occurs from fixture discharge.
This equalizes pressure within the system and so protects the trap seals. When the flow stops, the valve closes and seals tight by gravity, preventing any transmission of foul air out through the device and trap seals.
How the P.A.P.A. works
The STUDOR P.A.P.A. (Positive Air Pressure Attenuator) attenuates (slows down) the positive transients found in the drainage system of the high-rise building. These positive transients have an average volume of 2 litres of air, which is travelling backwards through the system at the speed of sound (320m/s).
These positive transients are slowed down by the P.A.P.A. in no more than half a second to less than 12 m/s, thus protecting the water seals within the building.
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