What is the primary purpose of pressure relief valves in backflow prevention assemblies?

The primary purpose of pressure relief valves in backflow prevention assemblies is to allow controlled discharge of water. These valves play a crucial role in maintaining system pressure and ensuring safe operation. When excess pressure builds up within the assembly—due to factors such as thermal expansion or blockage—these valves open to release the excess pressure in a controlled manner. This not only protects the integrity of the backflow prevention assembly but also helps to prevent potential damage to pipes and connected systems.

By allowing for this controlled discharge, the pressure relief valves ensure that the system operates efficiently while also mitigating the risks associated with overpressure situations, such as leaks or ruptures, thereby protecting both the plumbing infrastructure and the surrounding environment.