Reduced-Pressure Principle Backflow Prevention Assembly (RPBA)
Reduced-Pressure Principle Backflow Prevention Assembly (RPBA) : Two independently acting check valves together with a hydraulically operating, mechanically independent pressure differential relief valve located between the check valves and below the first check valve. These units are located between two tightly closed resilient-seated shutoff valves, as an assembly, and are equipped with properly located resilient-seated test cocks
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