Much like a backwater valve, a backflow preventer will only allow water to flow in a single direction. But unlike a backwater valve, its aim is to prevent the water from leaving your system rather than entering it.

ASSE 1022 covers backflow prevention devices designed to protect the potable water supply serving beverage dispensing equipment. These devices are intended for use under continuous or intermittent pressure conditions. Water dispensers covered by this standard include an integral electrically powered heater or cooler.

A: The 007 is a double check valve and the 009 is a reduced pressure. The reduced pressure is for more of a high hazard situation. If there is backflow on the 009 it will dump out of the bottom of the unit to a drain.

An RP with a 1.5 PSID relief valve opening point will still prevent backflow, but does it at a value lower than the minimum accepted value of 2.0 PSID. For the assembly to perform optimally, it must operate at or above this minimum standard, in this case 2.0 PSID.

ASSE 1013 “Performance Requirements for Reduced Pressure Principle Backflow Prevention Assemblies”

For all double check valve assemblies, the maximum allowable pressure loss through an assembly is 10 psi.

This 2 inch lead free copper silicon alloy reduced pressure zone backflow preventer assembly is designed to prevent the flow of polluted water from entering into the potable water supply due to backsiphonage and or backpressure in ance with national plumbing codes and water authority requirements.