Pressure relief valves operate in a similar manner to pressure safety valves, and the two terms are sometimes used interchangeably. However, the key difference is that PRVs operate gradually to regulate pressure, while PSVs operate very quickly to counteract sudden pressure spikes. To this end PRVs are more commonly used in liquid systems, and PSVs are more commonly used in gas systems.

Double check valvefor sprinkler system

Wilkins 350AST Lead Free 304L Stainless Steel Backflow Preventer Double Check Valve Assembly With Grooved End Butterfly Valve And Integral Supervisory Switch, 4 IN, Grooved End

3/4''double check valve assembly

Where pressure overload might lead to catastrophic failure in a system, pressure relief valves are essential. The pressure valves, or PRVs, work by opening when a pressure limit has been reached, and diverting either gas, liquid, or liquid-gas mixtures away from the system. How this is achieved depends on the system, but it usually relies on the medium following the path of least resistance offered by the relief valve, and then being disposed of accordingly. Diverted gas might be released into the atmosphere or burned off, and liquids may be diverted into storage or run off.

Once a satisfactory equilibrium has been achieved within the system, the pressure relief valve will then close again until needed. These safety valves are vital components in high pressure systems, as pressure build up can lead to anything from equipment inefficiency and failure to an explosion or fire risk. You can learn more in our guide to pressure relief valves.

The Zurn Wilkins 350AST double check backflow preventer with stainless steel body provides low hazard protection with a corrosion-resistant and light weight design.