What protects against backsiphonage and backflow in a water system?

A reduced pressure zone assembly (RPZ) is specifically designed to prevent backsiphonage and backflow in a water system, making it the most effective choice in this context. It is a type of backflow prevention device that consists of two independent check valves with a pressure differential relief valve located between them. This arrangement ensures that if there is a drop in water pressure in the system, which could cause backsiphonage, water will flow into the relief valve rather than back into the potable water supply. The RPZ is particularly valuable in scenarios where toxic or harmful substances could potentially contaminate the drinking water, as it provides a reliable safeguard.

An air gap also serves to prevent backflow, but it does so by maintaining a physical distance between the water supply and a potential source of contamination. While effective in many scenarios, it might not be suitable for all situations or feasible in terms of installation space.

Piped valves and check valves have their roles in controlling water flow, but they do not provide the same level of protection against backflow as a reduced pressure zone assembly. Piped valves can help regulate water pressure and prevent unwanted flow directions under certain conditions, but they are not specifically designed for backflow prevention. Check valves prevent reversal of flow