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Taizhou Hongjia Valve Co.,Ltd
Add : Ganjiang Industrial Area,Yuhuan,Zhejiang, China
E-mail : hongjia@hongjiavalve.com
Tel : 86-576-87453778
Fax : 86-576-87453939
M.B : 86-136 66847766
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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.