The cryogenic valve has the following performance characteristics:
1. The bonnet is designed as a long neck structure, which can isolate the influence of the low temperature medium on the packing, can prevent the performance of the cover seal from being lowered, and can also make the valve open and close flexible;
2. The filler adopts a flexible graphite or polytetrafluoroethylene combined structure, which has good low temperature resistance;
3. The low temperature valve adopts a structure in which a pressure reducing hole is opened on the valve core. The gasket is made of stainless steel wallet PTFE or flexible graphite wound structure;
4. When the valve is closed, in order to prevent the low temperature medium in the valve cavity from rising due to temperature rise, abnormal gasification is generated, and a pressure relief structure is arranged on the high pressure side of the shutter or the valve body;
5. The sealing surface of the valve is surfacing with cobalt-based hard alloy. The hard alloy has small deformation and wear resistance at low temperature and can maintain good sealing performance.
The output of liquid cryogenic media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum and other products are not only flammable and explosive, but also vaporized when heated, and the volume expands hundreds of times when gasified. The material of the cryogenic valve is very important. If the material is unqualified, it will cause leakage or leakage of the casing and sealing surface. The comprehensive mechanical properties, strength and rigidity of the components can not meet the requirements of use or even break; the leakage of LNG medium causes explosion. . Therefore, material handling is the primary key issue in the development, design, and development of cryogenic valves.
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