What does constant discharge from the relief valve of a Reduced Pressure Principle assembly usually indicate?

Constant discharge from the relief valve of a Reduced Pressure Principle assembly typically indicates a leaking number 1 check valve. In this type of backflow prevention assembly, the number 1 check valve is designed to prevent backflow into the potable water supply. If this check valve allows water to leak back, it can create a situation where the pressure in the zone between the two check valves drops, prompting the relief valve to open and discharge water continuously. This discharge is a result of the relief valve functioning to relieve excess pressure from that area, which is necessary when the number 1 check valve is compromised. Therefore, observing a constant discharge points directly to an issue with that particular check valve, confirming the need for inspection and possible repair or replacement.