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Development and optimization of electric high temperature gate valve
The relevant content of the low temperature gate valve has been introduced for everyone in a lot of space. Today we will talk about another kind of gate valve, the electric high temperature gate valve.
The electric high temperature gate valve is a gate valve with a single-sided metal hard seal cut-off type high temperature resistant gate valve. Mainly used in the flue gas turbine inlet pipeline of a catalytic cracking unit. It is fully opened during normal operation and quickly closed when it fails. It is a key valve for automatic interlocking of flue gas shutoff and emergency shutdown. Under normal circumstances, the number of actions is less.
In the 1990s, China began to pay attention to the design of electric high-temperature gate valves. Among the commonly used structures, the valve body and the bonnet adopt riveted welding structure, and the sealing form adopts a wedge-type double gate seal structure or a single-sided hard seal with a steam-assisted seal. However, due to lack of computer-aided design capabilities at that time, the structure was not optimized. Especially for the plate reinforcement, after a certain number of years of use, weld cracks will occur, which seriously affects normal production and is prone to safety hazards.
Therefore, some technicians use AnsysWorkbench thermal-structure coupling analysis method to analyze the thermal characteristics of the electric high-temperature gate valve body, determine the strain and stress distribution at the ribs, and use the parameter optimization module of Workbench to optimize the design of the ribs based on the calculation results. , Which makes the service life of the electric high temperature gate valve longer.
Related News
We know that low-temperature valves are mainly used in low-temperature environments. Therefore, their sealing packing must have low-temperature resistance. The more commonly used are paraffin asbestos packing and flexible graphite packing. At present, these two kinds of packing are used in low-temperature valves. It is better, the specific introduction is as follows:
1. Paraffin asbestos filler is made of asbestos fiber impregnated with paraffin wax, used for low temperature and cryogenic valves. This kind of sealing packing has the characteristics of good resistance to weak acid and strong alkali, high strength and good adsorption performance.
2. The temperature resistance of flexible graphite filler is very good. It can not only be applied to -200℃, but also can be used up to 500℃ in high-temperature oxidizing medium, and can be applied to 2000℃ in non-oxidizing medium, and can maintain excellent performance. The tightness. In addition, the flexible graphite packing has unique flexibility and resilience. The cut packing can be freely bent over 90° in the axial direction. During use, it will not leak due to temperature and pressure changes, vibration and other factors, so it is safe and reliable, and is an ideal seal. Material. Of course, in addition, flexible graphite filler also has the characteristics of strong corrosion resistance, low friction coefficient, good self-lubricity, low friction coefficient, good self-lubricity, and long service life.
When the valve core of the cryogenic valve falls off and cannot be cut out, how should we deal with it? This is a problem that we urgently need to solve. The following is a solution compiled by Bangwei Valve Factory for your reference.
1. Under the condition that the medium is sealed, do not move the valve body, valve core and valve seat, and change the assembly method of the valve cover, valve stem, copper sleeve, packing and gland;
2. After the above changes, the valve core is exposed, and then the valve stem and the valve core are restored by conventional methods, so that the three parts of the valve can be continuously sealed and the valve can be reopened.
3. After the bonnet of the cryogenic valve is disassembled, except for special valves, the wedge angle of the valve core is within the friction angle region. No matter how the pressure on the two ends of the valve core changes, the valve core will not squeeze from the valve seat under self-locking conditions. Come out, for the flat valve core, there is no squeeze out.