A PRV or pressure relief valve is a safety component which is used in pneumatic or hydraulic systems. These valves are designed to regulate the level of pressure within a system, preventing it from building higher than a pre-defined amount. Therefore, pressure relief valves are intended to prevent over-pressurisation.

Pressure relief valves are essential safety devices designed to protect systems, equipment, people, and the environment from overpressure conditions. By automatically releasing pressure when it exceeds a pre-set limit, PRVs prevent potential damage, explosions, and safety hazards.

A pressure relief valve is used to release excess pressure from a system during overpressure situations thus avoiding catastrophic failure. So, a Pressure relief valve is an important process safety device and is widely used in the chemical, petrochemical, power, and oil and gas industries.

Safety valves are fail-safe devices that automatically stop the increase of pressure beyond a determined limit. They are found in many systems, for example, power plants, petrochemical systems, and boilers. If the pressure reaches the setpoint, the safety valve will fully open until the pressure drops below the setpoint again.