Safety valve selection factors should be considered:

(1) selection of the Water Heater Gas Valves structure, depending on the device characteristics of the process conditions and working medium. Under normal circumstances, boilers, pressure vessels, most use a spring-loaded safety valve. For toxic, flammable and explosive media, the selection of a closed valve. Boiler and pressure vessel and safety discharge larger and smaller in thickness and low pressure container the best selection of safety valve.
(2) safety valve operating pressure range of boilers and pressure vessels should be considered the maximum allowable working pressure of selection.
(3) Gas Top Burner Valve displacement must be greater than safety discharge device, to ensure that the boiler or pressure vessel overpressure valve can be discharged in the open part of the media, to avoid the pressure continues to rise inside.
(4) The boiler safety valve, the total emissions must be greater than the boiler maximum continuous evaporation, and the drum and superheater safety valve opens after all, the steam pressure in the drum must not exceed 1.1 times the design pressure.