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Low temperature valve has the following performance characteristics: 1, bonnet design for the long neck structure, can isolate the effect of low temperature medium on the packing, to prevent the performance of the lid seal to reduce, but also allows the valve opening and closing flexibility; 2, filler using flexible graphite or Teflon composite structure, with good low temperature performance; 3, the valve used in the low-pressure valve hole opened the structure. 3, the gasket adopts stainless steel wallet PTFE or flexible graphite winding structure; 4, the valve is closed, in order to prevent the valve chamber temperature rise due to low temperature, resulting in abnormal gasification step pressure, in the gate or valve body High pressure side with a pressure relief structure; 5, the valve sealing surface surfacing cobalt-based hard alloy, carbide deformation at low temperatures, wear-resistant, can maintain good sealing performance. Due to the output of liquid cryogenic medium such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum gas and other products not only flammable and explosive, but also in the heating gasification, gasification, volume expansion hundreds of times. Cryogenic valve material is very important, the material failed, the shell and the sealing surface will result in leakage or internal leakage; parts of the overall mechanical properties, strength and steel can not meet the requirements even rupture; resulting in liquefied natural gas leak caused by explosion . Therefore, in the development, design, development of cryogenic valves, material handling is the primary key issue