Combination ball valves can be customized
Bellows globe pneumatic valve fault analysis and processing
by：AIRWOLF
2020-10-15
Bellows globe problems appeared in the process of pneumatic valve in use should be how to solve?
Let's to talk about what problem encountered and should take the solution.
1. Using corrugated pipe cut-off pneumatic valve installed on the road at the pipe of ship power plant, happened in the process of using pneumatic valve pneumatic valve stem leakage and pneumatic valve stem rust problem such as death, although after the repair. But the problem appeared again and again. After analysis of the cause of the problem, take the appropriate solution, to eliminate the fault, to ensure that the performance of the pneumatic valve.
2. Problem analysis
bellows globe pneumatic valve leakage generally can be divided into internal leakage and leakage two cases, the cause of leakage. Endocrine is generally factor liquid medium containing solid impurities be ruined cause failure. Combined with the site usage analysis, the reasons of pneumatic valve stem leakage mainly used with pneumatic valve structure, the working environment and operating mode.
2。 1 structure of pneumatic stem using corrugated tube and double seal packing, corrugated pipe and the inner ring and outer ring welding bellows components, again with pneumatic valve stem and guide body welding, to the outside through pneumatic valve stem leakage blocking medium. Pneumatic valve stem up and down the moving distance of flat key Ⅰ upward movement, until the flat key Ⅰ on end face and packing the face under contact. Because the packing used PTFE material, material, if excessive open pneumatic valve, will lead to a flat key Ⅰ embedded filler, pneumatic valve cannot be opened and closed again, and killed the bellows components, thus causing medium along the pneumatic valve stem leakage. Corrugated pipe tensile length and amount of compression is determined according to stroke of the pneumatic valve, if exceed the limit tensile or compression, may damage the corrugated pipe, small make up tube rupture, seal failure. So you need to increase the spacing device of the pneumatic valves open and close, make the pneumatic valve opening and closing process, bellows expansion in the scope of design.
2。 2 bellows globe pneumatic valve working conditions is also a cause of its malfunction.
because of the corrugated pipe in the installed on the hull as pneumatic valve work in the salt fog environment for a long time, and the upper condensate dripping water, cause the upper thrust bearing corrosion, serious when, in contact with the pneumatic valve stem corrosion 2. 3 operations in use if excessive open or close the pneumatic valve, corrugated pipe cut-off is likely to lead to the pneumatic valve can not meet the performance requirements. Excessive close the pneumatic valve, it could crush seal face, cause again when using pneumatic valve seal failure. Excessive open pneumatic valve, may be operating bellows components, pneumatic valve leakage.
3. Improve
after analyzing the problems existing in the pneumatic valve, the structure, operation and environment were improved. First is to increase the flat key Ⅰ limit welfare funds, will increase a PTFE material under packing for 3 ㎜ thick stainless steel packing cushion, in order to prevent the packing get dirty and the limit of pneumatic valve rod.
in the pneumatic valve is closed, if there is a pneumatic valve cannot be shut off, should not to force, but open the pneumatic valve, with fluid scour off again after a period of time, over and over again, if still cannot close, should check the sealing surface grinding. , the pneumatic valve is opened when the pneumatic valve opens to a certain height, pneumatic valve stem encountered little resistance, try not to continue to force open, in order to prolong the life of pneumatic valve stem and sealing components. Pneumatic valve stem top by the pneumatic valve, with a thrust bearing in the installation, should avoid to have the condensate dripping directly in the location of the pneumatic valve in pneumatic valve stem rust.
4. Conclusion
bellows globe after the modification of the pneumatic valve, no recurrence of corrugated pipe cracking, pneumatic valve stem rust and leakage fault, use in good condition.
1. Using corrugated pipe cut-off pneumatic valve installed on the road at the pipe of ship power plant, happened in the process of using pneumatic valve pneumatic valve stem leakage and pneumatic valve stem rust problem such as death, although after the repair. But the problem appeared again and again. After analysis of the cause of the problem, take the appropriate solution, to eliminate the fault, to ensure that the performance of the pneumatic valve.
2. Problem analysis
bellows globe pneumatic valve leakage generally can be divided into internal leakage and leakage two cases, the cause of leakage. Endocrine is generally factor liquid medium containing solid impurities be ruined cause failure. Combined with the site usage analysis, the reasons of pneumatic valve stem leakage mainly used with pneumatic valve structure, the working environment and operating mode.
2。 1 structure of pneumatic stem using corrugated tube and double seal packing, corrugated pipe and the inner ring and outer ring welding bellows components, again with pneumatic valve stem and guide body welding, to the outside through pneumatic valve stem leakage blocking medium. Pneumatic valve stem up and down the moving distance of flat key Ⅰ upward movement, until the flat key Ⅰ on end face and packing the face under contact. Because the packing used PTFE material, material, if excessive open pneumatic valve, will lead to a flat key Ⅰ embedded filler, pneumatic valve cannot be opened and closed again, and killed the bellows components, thus causing medium along the pneumatic valve stem leakage. Corrugated pipe tensile length and amount of compression is determined according to stroke of the pneumatic valve, if exceed the limit tensile or compression, may damage the corrugated pipe, small make up tube rupture, seal failure. So you need to increase the spacing device of the pneumatic valves open and close, make the pneumatic valve opening and closing process, bellows expansion in the scope of design.
2。 2 bellows globe pneumatic valve working conditions is also a cause of its malfunction.
because of the corrugated pipe in the installed on the hull as pneumatic valve work in the salt fog environment for a long time, and the upper condensate dripping water, cause the upper thrust bearing corrosion, serious when, in contact with the pneumatic valve stem corrosion 2. 3 operations in use if excessive open or close the pneumatic valve, corrugated pipe cut-off is likely to lead to the pneumatic valve can not meet the performance requirements. Excessive close the pneumatic valve, it could crush seal face, cause again when using pneumatic valve seal failure. Excessive open pneumatic valve, may be operating bellows components, pneumatic valve leakage.
3. Improve
after analyzing the problems existing in the pneumatic valve, the structure, operation and environment were improved. First is to increase the flat key Ⅰ limit welfare funds, will increase a PTFE material under packing for 3 ㎜ thick stainless steel packing cushion, in order to prevent the packing get dirty and the limit of pneumatic valve rod.
in the pneumatic valve is closed, if there is a pneumatic valve cannot be shut off, should not to force, but open the pneumatic valve, with fluid scour off again after a period of time, over and over again, if still cannot close, should check the sealing surface grinding. , the pneumatic valve is opened when the pneumatic valve opens to a certain height, pneumatic valve stem encountered little resistance, try not to continue to force open, in order to prolong the life of pneumatic valve stem and sealing components. Pneumatic valve stem top by the pneumatic valve, with a thrust bearing in the installation, should avoid to have the condensate dripping directly in the location of the pneumatic valve in pneumatic valve stem rust.
4. Conclusion
bellows globe after the modification of the pneumatic valve, no recurrence of corrugated pipe cracking, pneumatic valve stem rust and leakage fault, use in good condition.
Custom message
Related Products
