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reduced pressure zone device

Standards
a device to prevent backflow caused by either back-siphonage or backpressure in a water reticulation system, which incorporates two independently operating force loaded non-return valves and automatically drains to waste whenever the pressure in the system between the upstream and downstream non-return valves reduces to a pressure not less than 14 kPa below the pressure at the inlet to the upstream non-return valve
Source - AS/NZS 3500.0:2003: Plumbing and drainage
Standards
see backflow prevention device
Source - AS/NZS 3500.0:2003: Plumbing and drainage
HB50
device to prevent backflow caused by either backsiphonage or backpressure in a water reticulation system
It incorporates two independently operating force loaded non-return valves and automatically drains to waste, whenever the pressure in the system between the upstream and downstream non-return valves reduces to a pressure not less than 14 kPa below the pressure at the inlet to the upstream non-return valve.