Reduced Pressure Backflow Assembly (RPBA)
An RPBA is a mechanical backflow preventer that consists of two independently acting, spring-loaded check valves with a hydraulically operating, mechanically independent, spring-loaded pressure differential relief valve between the check valves and below the first check valve.
Only one RPBA required to serve the whole system; control valves can be located downstream of (after) the RPBA.
A City Recognized backflow assembly tester when installed, annually or when moved, or repaired must test RPBAs.
RPBAs must be installed a minimum of one foot (12") above ground level
In an RPBA equipped system, fertilizer and other agricultural chemicals may be introduced downstream of (after) the RPBA.
An RPBA is effective against backpressure backflow and backsiphonage and may be used to isolate health or non-health hazards.