Backflow Prevention Practice Exam

If the relief valve of a reduced pressure principle assembly discharges, this indicates that the system is experiencing ____?

1. High pressure

2. Backsiphonage

3. Backpressure

4. Pressure equalization

The correct answer is: Backsiphonage

The discharge of the relief valve in a reduced pressure principle assembly is indicative of backsiphonage occurring in the system. This safety feature is designed to prevent contaminant ingress into the potable water supply. Under normal circumstances, the assembly maintains a pressure differential by ensuring that there is lower pressure at the outlet side than at the inlet side. If backsiphonage takes place, it means that negative pressure or a drop in pressure on the downstream side is causing potential contaminants to be drawn into the potable water line. The relief valve opens to release some of the system pressure, thereby preventing backflow of contaminants into the drinking water. This mechanism is crucial for maintaining the safety of the water supply, especially when sudden changes in water use or pressure fluctuations occur in the system.