Reduced pressure zone backflow prevention device definition
Reduced pressure zone backflow prevention device means a device containing a mini- mum of two independently acting check valves together with an automatically operated pressure differential relief valve located between two check valves. During normal flow and at the cessation of normal flow, the pressure between these two checks shall be less than the supply pressure. In case of leakage of either check valve, the differential relief valve, by discharging to the atmosphere, shall operate to maintain the pressure between the check valves at less than the supply pressure. The unit must include 100% closing shutoff ball valves located at each end of the device, and each device shall be fitted with properly located test cocks.
Reduced pressure zone backflow prevention device means a device containing a min- imum of two independently acting check valves together with an automatically operated pressure differential relief valve located between two check valves. During normal flow and at the cessation of normal flow, the pressure between these two checks shall be less than the supply pressure. In case of leakage of either check valve, the differential
Reduced pressure zone backflow prevention device. RPZ")" shall mean an assembly of two independently operating check valves with an automatically operating differential relief valve between the two check valves, tightly closing shutoff valves on either side of the check valves, plus properly located test cocks for the testing of the check and relief valves. The entire assembly shall meet the design and performance specifications and approval of a recognized and city-Approved testing agency for Backflow Prevention Devices. The device shall operate to maintain the pressure in the zone between the two check valves at a level less than the pressure on the public water supply side of the device. At cessation of normal flow the pressure between the two check valves shall be less than the pressure on the public water supply system side of the device. In case of leakage of either of the