Pressure cum vacuum relief valve is a safety device to protect the tanks, containers, gas from rupture when pressure changes in the tank due to normal operations. It acts as a protector for tanks during transportation.
Pressure/Vacuum Relief Valves are protection devices typically mounted on a nozzle opening on the top of a fixed roof atmospheric storage tank. The seat and pallet of pressure cum vacuum relief valves are designed so as to offer quick opening at the attainment of pressure. The pressure cum vacuum relief valve has a dual nature in its function.
1. To release the excess pressure in the Tank
2. To prevent Pressure drop in the tank.