Safety valves are valves designed to protect systems, which are engineered for different fluids and specific pressures, against all potential hazards. When the system pressure exceeds a predetermined design value, the safety valve allows the controlled release of the fluid (steam, liquid, or gas). According to the safety regulations for pressure vessels, a pressure vessel is generally equipped with two safety valves.
Function
If the system pressure exceeds the set pressure of the valve, it releases a certain amount of steam, gas, or liquid. This protects the system from excessive pressure and ensures that the pressure remains within safe limits. The valve must reseal after relieving pressure with minimal pressure drop and remain leak-proof until the next opening. The safety valve reaches its full discharge capacity with a maximum pressure increase of 10% above the set pressure.
Closing Pressure: For compressible fluids, the closing pressure is at most 10% below the initial opening pressure (set pressure). For incompressible fluids, the closing pressure is at most 20% below the initial opening pressure.