Which device is recommended for hazard levels deemed high?

The Reduced Pressure Zone (RPZ) Assembly is recommended for situations where the hazard levels are considered high, primarily due to its ability to effectively prevent backflow in applications that pose a significant danger to the potable water supply.

The RPZ works by using two check valves with a pressure differential between them, ensuring that, even under conditions where backpressure may occur, the potential for contaminants entering the drinking water system is minimized. The continuous monitoring of the pressure differential allows any significant drop in pressure to trigger the relief valve to discharge, thus preventing backflow. This makes RPZ assemblies particularly effective in protecting against high hazards, such as in industrial applications, irrigation systems, or areas where toxic or hazardous substances might be present.

In contrast, the other devices like the Single Check Valve, Dual Check Valve, and Vacuum Breaker are suitable for low to moderate hazard situations but do not offer the same level of protection that an RPZ does in high hazard environments. For example, a Single Check Valve or Dual Check Valve may not sufficiently guard against backpressure or backsiphonage, and a Vacuum Breaker is generally only effective in preventing backsiphonage under low hazard conditions. Thus, the RPZ is the go-to solution for high-risk scenarios,