Reduced pressure backflow device definition
Reduced pressure backflow device. (RPZ or RPBD) shall mean a device incorporating two or more check valves and an automatically operating differential relief valve, located between the two checks, two shut off valves, and equipped with necessary appurtenances for testing. The device shall operate to maintain the pressure in the zone between the two check valves at pressure less than that on the public water supply side of the device. At cessation of normal flow, the pressure between the check valves shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve shall operate to maintain this reduced pressure by discharging to the atmosphere.
Reduced pressure backflow device means a device incorporating 2 or more spring-loaded check valves and an automatically-operating relief valve located between the 2 check valves, with 2 shut- off valves and the necessary appurtenances for testing.