Pressure relief valve is a self operating valve that is used to relieve pressure by allowing the pressurized fluids (liquids. Gas or gas liquid mixtures) to flow from an auxiliary passage out of the vessel or process system. Pressure relief valves are designed to protect chemical feed systems from overpressure damage caused by defective equipment or deadheading. When the set pressure exceeded, the pressure relief valve is forced to open & the portion of the fluid is diverted to the auxiliary route. As the fluid is diverted, the pressure inside the vessel or process system will drop and once it reaches the valve’s resetting pressure, the valve will close. This will protect the vessel or process system from damage due to abnormal excess pressure conditions. Valves are available in 1/4″ to 2” sizes in PP, PVC, PVDF, SS304 and SS316.