DA22F-25/40P(C) V Cryogenic Safety Valve Stainless Steel 65bar

A safety valve is a fail-safe device that automatically releases fluid from a system, such as a pressure vessel or boiler, when its pressure or temperature exceeds a preset limit to prevent damage or explosion. It acts as a final line of defence, protecting equipment, property, and lives by discharging excess fluid and then automatically reclosing once normal operating conditions are restored. 

How a Safety Valve Works
  Receiving Pressure: The valve's nozzle receives high pressure from the system's inlet. 
  Opening: When the system pressure exceeds the set point, a disc is forced open, allowing the excess fluid (like steam or gas) to discharge. 
  Closing: As the pressure decreases to a safe level, the spring or other mechanical force closes the disc, stopping the flow of fluid. 
Key Characteristics
  Fail-Safe: It is designed to operate automatically without external power. 
  Protective Device: Its primary purpose is to prevent overpressure and potential catastrophic failures. 
  Last Line of Defence: Safety valves are often the final safety measure in a system, ensuring safety under extreme conditions. 
  Automatic Reset: After relieving the excess pressure, the valve recloses to the normal operating state. 
Why They Are Necessary
  Overpressure Prevention: Systems can experience dangerous pressure increases due to various reasons, such as equipment malfunctions or

  process upsets. 
  Equipment Protection: Safety valves safeguard pressure vessels, boilers, and other systems from damage or explosive failure. 
  Personnel and Property Safety: By preventing overpressure, they protect the lives of people in and around the facility and prevent damage to     infrastructure