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Cryogenic valve is the valve can be used under low temperature conditions, the valve is usually referred to as working temperature below -40 ℃ 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 the heating gasification, gasification, volume expansion hundreds of times.
Liquefied natural gas valve material is very important, unqualified material, will result in 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. Body, bonnet with: LCB (-46 ℃), LC3 (-101 ℃), CF8 (304) (- 196 ℃).
Low-temperature valves need to use long-necked valve cover structure, the day is to reduce the heat transmitted to the outside world; to ensure that the filler box temperature above 0 ℃, the filler can work properly; Parts in the stuffing box stem and the upper part of the valve cover frost or freeze.
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.
Many people directly put the valve material is low-temperature steel directly considered to be low-temperature valve, it is not true, it is only a semi-finished products of cryogenic valves, because it has not been cryogenic cryogenic treatment can also be said cryogenic cryogenic treatment is the crowning touch of the valve 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.
In fact, most of the domestic low-temperature valves are not cryogenic cryogenic treatment, the first cost will be expensive, where I can give you a rough calculation, if you add a set of cryogenic equipment, high cost, cryogenic equipment is expensive, but also In addition to cryogenic materials necessary liquid nitrogen is a bad storage medium, as well as a lot of liquid nitrogen consumed in the treatment of a valve, and the price of liquid nitrogen is not cheap. The produced cryogenic valves are specially cryogenically treated and the rough parts are placed in a cooling medium for a few hours (2-8 hours) to relieve stresses and ensure low temperature properties of the material to ensure finishing dimensions in case the valve is on Low temperature conditions, due to temperature changes caused by the leakage of low temperature valve.
Low temperature valve selection Inquiry Order Note:
In order for the cryogenic valve to better meet the customer's requirements, if you need a cryogenic valve, please provide the specific parameters you know
The name of the low temperature medium
Low temperature medium temperature
3. You need to customize their length so that the length of the neck of the cryogenic valve is not provided by the valve;
4. Cryogenic valve material (can be customized according to customer requirements);
5. Cryogenic valve pressure;
6. Cryogenic valve seal (soft seal or hard seal);
7. Connection (flange connection or welding);
8. Drive mode (manual, pneumatic, electric).
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