One of the most notable features of cryogenic resilient wedge gate values is that their bonnets are generally long-necked. GB/T 24925 "Technical Conditions for Cryogenic Valves" also clearly stipulates that the bonnets of cryogenic gate valves, globe valves, ball valves, and butterfly valves should be The use temperature requirements of the bonnet are designed into a long-neck bonnet structure that is convenient for cold preservation to ensure that the temperature at the bottom of the stuffing box remains above 0°C.”
The rapid development of science and technology, manifested in the field of resilient wedge gate value technology, has made more and more types of valves and materials, and more and more complicated valve models. Although my country has a unified standard for valve model compilation, it is increasingly unable to meet the needs of valve technology development. At present, resilient wedge gate value manufacturers generally adopt a unified numbering method: where a unified numbering method cannot be used, each valve manufacturer has developed a numbering method according to its own needs.