Low temperature valve has the following performance characteristics:
1, The valve cover is designed as a long neck structure, which can isolate the influence of low temperature media on the packing, prevent the performance of the cover seal, and also make the valve open and close flexibly;
2, the filler adopts flexible graphite or polytetrafluoroethylene combined structure, with good low temperature resistance;
3, the low-temperature valve adopts the structure of opening a decompression hole on the valve core. Gasket adopts stainless steel leather clip polytetrafluoroethylene or flexible graphite winding structure;
4, when the valve is closed, in order to prevent the low-temperature medium in the valve chamber from rising due to temperature, resulting in abnormal pressure increase, pressure relief structure is provided on the high pressure side of the gate or valve body;
5, the sealing surface of the valve surfacing cobalt-based cemented carbide, tungsten carbide at low temperature deformation is small, wear resistance, can maintain good sealing performance.
Because the output of liquid low-temperature media such as ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum and other products are not only flammable and explosive, but also gasification when heating up, and the volume expands hundreds of times when gasification. The material of the low-temperature valve is very important, and the material is unqualified, which will cause the external leakage or internal leakage of the shell and sealing surface; The comprehensive mechanical properties, strength and steel of the parts can not meet the requirements of use or even break; Resulting in liquefied natural gas medium leakage caused by the explosion. Therefore, in the process of developing, designing and developing low-temperature valves, material treatment is the primary key issue. (2023-09-28)
