Which components of an RPZ assembly are typically tested?

The testing of components in a Reduced Pressure Zone (RPZ) assembly is crucial to ensure that the device functions properly to prevent backflow, which can contaminate the potable water supply. The primary components that are tested in an RPZ assembly are the two check valves and the relief valve.

The two check valves are essential for providing the necessary backpressure to prevent backflow into the clean water supply. Testing these valves ensures they are sealing correctly and functioning as intended. If one of the check valves fails, contaminated water could potentially flow back into the potable system.

The relief valve is specifically designed to discharge water in the event that the pressure drops below the acceptable level in the system. Testing the relief valve ensures that it opens at the right pressure and closes properly to allow for adequate drainage if needed. If this component fails to function, it could lead to damage or dangerous backflow situations.

In contrast, while other components may be important for the overall functionality of the RPZ system, they are not the primary focus during testing for backflow prevention. For instance, the toggle valve and pressure gauge may assist in monitoring conditions but do not directly affect the backflow prevention. Similarly, components like the inlet strainer, outlet valve, pressure regulator, and air