Performance Requirements for Positive Pressure Reduction Devices for Sanitary Drainage Systems
|Publication Date:||5 October 2009|
The device consists of a variable volume reservoir contained within a ventilated rigid outer casing with an inlet connection by which the reservoir inflates when subject to positive pressure. In its inactive state, the flexible reservoir is deflated. Expansion only occurs in response to an increase in line pressure at the entrance to the device. This expansion provides a variable volume reservoir for air. The device connects to the drainage network via an airtight seal to prevent the diversion of airflow from entering the reservoir. As a result the reservoir becomes an integral part of the drainage network.