PORV are also called pilot-operated safety valve ( POSV ), pilot-operated pressure relief valve ( POPRV ), or pilot-operated safety relief valve ( POSRV ), depending on the manufacturer and the application. Technically POPRV is the most generic term, but PORV is often used generically (as in this article) even though it should refer to valves

A pressure relief valve is a device that is used to protect piping and other equipment from the excessive pressure. The major function of 

The primary function of Safety Relief Valves is the protection of life, property and environment. A Safety Relief Valve is a (safety) device designed to 

A relief valve, also known as a pressure relief valve, is a device that lowers the pressure to prevent damage to the system. Their function is to protect pressure sensitive equipment from damage caused by overpressure. They are critical in a pressure system to ensure that system failures are avoided.

Relief valves have a purpose quite different from the previous valves. They are designed to release excessive pressure that builds up in equipment and 

Pressure relief valves are used in hydraulic systems to limit the system pressure to a specific set level. If this set level is reached, the pressure relief 

A pressure safety valve is designed to open and relieve excess pressure from vessels or equipment and to re-close and prevent the further release of fluid after normal conditions have been restored. A pressure safety valve is a safety device and in many cases the last line of defense.

The primary purpose of a pressure or vacuum relief valve is to protect extensive flow lab facilities. emerson's range of pressure relief valves.

A pressure relief valve is used to release excess pressure from a system during overpressure situations thus avoiding catastrophic failure.

Reduce the downstream pressure to a constant level whenever it exceeds a threshold · Maintain sustained pressures down- or upstream from the valve · Reduce the 

Safety relief valves function as relief valves for liquids and as safety valves for gases. Eliminate turned-down vents from safety relief valves, i.e., upside down U. Possible accidental ignition of releases from such vents wiU likely result in flame impingement on the top external surface of the tank, above the internal wetted surface. BLEXT