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ASSE Standard #1063-2008 (Download)

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Performance Requirements for Air Valve and Vent Inflow Preventer (ANSI Approved: 2008)

The purpose of these Assemblies is to allow the release & admission of high volumes of air through air valves & vents in water distribution systems, but prevent the entry of contaminated water when the air valve outlet becomes submerged from flooding or is maliciously tampered. This assembly shall consist of a primary and a secondary chamber that each contain an independent float-operated closure member. The primary chamber is the lower chamber. The secondary or upper chamber is redundant and will close in the event the primary chamber fails to close.

Products downloaded are not to be reproduced or distributed in any way.

A hard copy version of this standard is also available.  

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