A reduced pressure zone backflow preventer is designed to...

A reduced pressure zone backflow preventer is specifically engineered to stop backpressure and backsiphonage, making it a critical component in protecting public water supplies. By creating a physical barrier, it ensures that water cannot flow backward into the distribution system, which could occur under conditions of negative pressure (backsiphonage) or when there is a higher pressure downstream (backpressure).

This device includes two check valves separated by a pressure relief valve, which constantly monitors the pressure difference between the incoming water and the area immediately after the check valves. If the pressure drops below a certain threshold, allowing potential contaminants to enter the clean water supply, the relief valve opens to discharge any water, thus maintaining the integrity of the potable water supply.

The design and functionality of a reduced pressure zone backflow preventer highlight its effectiveness in safeguarding against contamination risks, which is paramount in any water distribution system. The other options do not reflect the primary purpose of this device, which is focused on preventing backflow rather than enhancing flow rates, filtering contaminants, or allowing unrestricted flow.