How to choose a safety valve? How safety valve selection?

This equipment should be determined according to the work environment.
Many gas Burner Valves classification, according to the structure to points, can be divided into a spring-loaded safety valve and lever safety valve. In case of large capacity requirements, harboring a pulse valve, also known as the pilot valve. According to
Emissions to sub-divided into a safety valve and inching valve. According to the structure and the loading mechanism to sub-divided into hammer lever safety valve, spring-loaded valve and pulse
gas safety burner valve three. By way of medium discharge points, it is divided into fully enclosed valve, semi-closed valve and open valve three. According to the size of the valve opening is divided into spring Enlight closed high-pressure safety valve two kinds of valves and springs. Not only to understand how the selection valve safety valve above classification, but also understand the media's safety valve, if there is corrosion, temperature, pressure, size (working pressure and opening pressure)