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Portland Water Bureau

From forest to faucet, we deliver the best drinking water in the world.


1120 SW Fifth Ave, Suite 600, Portland, OR 97204

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Restored: Reduced Pressure Backflow Assembly

The Reduced Pressure Backflow Assembly (RPBA) is made up of two independently-acting spring-loaded check valves separated by a spring-loaded differential pressure relief valve, two shut-off valves and four test cocks.  The reduced pressure backflow assembly is intended to be installed on service connections where what could backflow would pose a significant risk to health.

Diagrams of reduced pressure backflow assemblies are illustrated below: 

Standardized Information for Reduced Pressure Backflow Assemblies:

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