压力真空断路器组件用于安装在供水管道中，以防止非饮用材料仅通过反虹吸进入饮用水供应。它不适用于任何可以向组件施加背压的系统。当供气压力在7至14 kPa（1至2 psi）之间时，进气阀打开，总成将持续排放。由于大气进气阀可能会排水，因此总成只能安装在排水不会造成损坏的地方。

Pressure vacuum breaker assemblies are for installation in water supply lines to prevent the entrance of non-potable material into the potable water supply by backsiphonage only. It is not for use in any system where backpressure can be applied to the assembly. When a supply pressure is between 7 to 14 kPa (1 to 2 psi), the air inlet valve is open and the assembly will continuously discharge. Due to this probability of water discharge from the atmospheric air inlet valve, the assembly shall only be installed where water discharge does not cause damage.