What does the acronym RPZ stand for in backflow prevention?

The acronym RPZ stands for Reduced Pressure Zone. This term is essential in the context of backflow prevention because an RPZ assembly is a type of backflow prevention device designed to protect potable water supplies from contamination. It operates by maintaining a reduced pressure on the downstream side of the device compared to the supply side, thus preventing backflow of potentially contaminated water.

An RPZ assembly is equipped with two independently acting check valves and a relief valve that vents the space between the check valves to the atmosphere. This configuration ensures that if either check valve fails, the relief valve will open to prevent backpressure, making it highly effective in preventing backflow incidents.

Understanding the principle of a Reduced Pressure Zone is crucial for ensuring safe water supplies and proper backflow prevention in various applications, such as irrigation systems, fire protection systems, and other water usage scenarios.