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ASSE Standard #1012-2009

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Performance Requirements for Backflow Preventer with an Intermediate Atmospheric Vent (ANSI Approved - September, 2009)

The devices covered by this standard are those which have functional capabilities for preventing both back-siphonage and back pressure and which can operate under continuous or intermittent pressure conditions. These devices have two (2) independently operating check valves separated by an intermediate chamber with a means for automatically venting it to the atmosphere and can be installed in the horizontal, vertical up or vertical down orientations. The check valves are force loaded to a normally closed position and the venting means is force loaded to a normally open position.

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A downloadable version of this standard is also available. 

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