Common problems of low-temperature valve and buy misunderstanding Cryogenic valve is the valve can be used under low temperature conditions, usually the working temperature is below -40 ℃ valve called cryogenic valve. Cryogenic valve is one of the most important equipment in the petrochemical industry, air separation and natural gas industries. The quality of the valve determines whether it can be produced safely, economically and continuously. With the development of modern science and technology, the use of cryogenic valves is more and more widely used, and the demand is also growing. For temperatures above -50 ° C, long neck structures are generally not used and for neck valves with temperatures below -50 ° C, the neck length, T, is determined based on the design and calculation of Ejie Valve Co. Cryogenic valve is mainly used for the output of liquid cryogenic media such as Ethylene, liquid oxygen, liquid hydrogen, liquefied natural gas, liquefied petroleum products, etc., not only flammable and explosive, but also in gasification when gasification, gasification, volume expansion hundreds of times. Liquefied natural gas valve material is very important, unqualified material, will cause the shell and sealing surface leakage or internal leakage; parts of the overall mechanical properties, strength and steel can not meet the requirements of use or even broken. Lead to liquefied natural gas leak caused by explosion. Therefore, in the process of developing, designing and developing liquefied natural gas valves, the material is the most important issue. The valve body and bonnet adopt: LCB (-46 ℃), LC3 (-101 ℃), CF8 (304) (-196 ℃). Low-temperature valve needs long bonnet cover structure, Of the heat; to ensure that the temperature of the stuffing box at 0 ℃ above, so that the filler can work properly; to prevent the stuffing box part of the supercooling in the stuffing box parts of the valve stem and the upper part of the frosting or freezing. The design of the long-necked bonnet is mainly the design of the neck length L. L refers to the distance from the bottom of the stuffing box to the upper surface of the sealing seat. It is related to the thermal conductivity, the heat conduction area, the surface heat dissipation coefficient, the heat dissipation area and other factors , Calculation is more complicated, generally obtained by the experimental method. Cryogenic valve harsh working conditions, most of its working medium for flammable, explosive, highly permeable material, the minimum working temperature of up to -269 ℃, the maximum operating pressure of 10MPa. Therefore, the design, manufacture and inspection of cryogenic valves are quite different from those of general purpose valves. Yijie Valve has always been motivational to do everything, we encountered many customers in the sales misunderstanding of the cryogenic valve will think of writing articles. Many customers directly put the valve material is low-temperature steel is directly considered to be low-temperature valve, it is not true, it is only a semi-finished products of cryogenic valves, because he did not cryogenic treatment, it can be said cryogenic cryogenic treatment is the crowning touch Cryogenic valve is the key cryogenic treatment, so as to ensure that the parameters of the cryogenic valve to meet the requirements, especially the expansion coefficient, it will not lead to the use of a variety of valve stuck state. Sometimes consider the price of the problem, but also consider the quality of the valve. Cryogenic valve is a special valve.
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