Cryogenic control valves are usually used to cut off or control industrial media with very low operating temperatures. In addition to liquid nitrogen and other liquid inert gases, most of the medium controlled by the cryogenic valve is not only flammable and explosive, but also gasifies when heating or flashing, resulting in a sharp expansion of the volume, which is easy to lead to leakage and explosion Based on the characteristics of the medium and the requirements of adapting to the use of the valve at low temperature, the design, manufacture, test and installation methods of the cryogenic valve are different from ordinary valves.