The term "approved reduced pressure principle assembly" applies to what configuration?

The term "approved reduced pressure principle assembly" refers specifically to a backflow prevention device that is designed to protect against backpressure and backsiphonage in potable water systems. This assembly is composed of critical components that ensure it functions effectively in preventing contamination of the public water supply.

The correct configuration includes two tightly closing shutoff valves, which allow for isolating the assembly for testing and maintenance. The four test cocks are essential for performing the various tests needed to ensure the assembly is functioning correctly and maintaining the required levels of protection against contamination. Lastly, the two check valves are critical components that work together to prevent backflow; they ensure that water can flow only in the intended direction, blocking any reverse flow that could potentially contaminate the system.

This assembly setup is integral to the "reducing pressure principle," which maintains a specific level of pressure within the system to prevent backflow situations, where non-potable water could flow into the potable water supply. Each component plays a vital role in guaranteeing the assembly functions as intended and meets health and safety regulations for backflow prevention.