Abstract: As the main control component in the fluid transportation system of the petrochemical industry, the sealing performance of the valve will have a great impact on the energy saving effect of the whole system. It is more important to improve the sealing structure of the valve. Based on this, this paper first expounds the influencing factors and application points of the valve sealing structure, then explores the improvement measures and improvement effects of the valve sealing structure, hoping to deepen the exploration from the theoretical level and play a certain enlightenment for the actual work. .
Key words: valve structure improvement application CLC number: TG26 Document code: A Article ID: 1672-3791(2018)12(a)-0-02
The more prone to problems in the use of valves is the failure of strength and seals, which inevitably leads to waste of energy resources and safety problems. The improved work of the structural seal of the valve is the key to improving the quality of the valve application. Deepening the research from a theoretical level can contribute to the improved operation of the actual valve seal structure.
1 Influencing factors of valve sealing structure and application points 1.1 Analysis of influencing factors of valve sealing structure The sealing degree of the valve needs to be determined by the combination of its type and nature. The sealing degree of the valve is also related to the valve material and equipment tooling and process. Direct relationship, quality problems in any link, will inevitably affect the application quality of the valve [1]. In combination with scientific design standards, the sealing structure should be designed as a cone or a sphere, but compared with the planar sealing structure, this sealing structure will have many adverse effects, the sealing surface is prone to scratches, and there are many repairs and processing. The difficulty of this, it is also easier to increase production costs, etc., market sales will also have a big impact.
The sealing surface of the valve is designed as a cone or a spherical body, which has the influence of unfavorable factors. The flat seal design is adopted, and the sealing surface of the valve stem and the bonnet is changed from the original conical shape to a flat contact pattern. This way is limited, the device and Equipment accuracy can be guaranteed and processing is relatively easy. The length of time the valve is used is proportional to the number of valve switches, and the maintenance is also relatively easy [2].
1.2 Application of valve sealing structure In the application of valve sealing structure, it is necessary to pay attention to several aspects, and the valve can not be operated under relatively small opening conditions, and the valve needle is relatively slow to start. Therefore, the throttle interval is relatively small when the opening degree is small, and the pitch of the locking mechanism can be appropriately enlarged, the opening speed and the lift of the valve needle are increased, and the opening degree of the work is further increased, which can effectively extend the valve use. cycle.
In the practical application of the valve sealing structure, the medium temperature is relatively easy to affect the valve life cycle. Excessive medium temperature is easier to shorten the valve life. In the specific use process, it is necessary to try not to apply the valve to the high temperature medium. The pressure relief valve adds a cooling device that effectively extends the valve life cycle. To avoid the entry of impurities, this will affect the life of the needle valve [3]. In addition, regular cleaning and filtration of high-pressure medium are required. Filtration is required to filter the liquid. The number of times of use must be appropriately shortened, and the cleaning of the fuel tank should be done. Only from these aspects, full attention has been paid. In order to ensure the application quality of the valve sealing structure.
2 Improvements and improvements of the valve sealing structure 2.1 Improvements of the valve sealing structure The improvement of the valve sealing structure can improve the performance of the valve sealing structure. The industrial manufacturer's red valve sealing surface can be repaired by the corresponding Anfa. A commonly used grinding method is suitable for the case where the sealing surface of the valve is damaged to a small extent, and the grinding stone and the sandpaper can be ground by adding an appropriate abrasive. It can also be applied by deep repair method, mainly by turning machining. The application of this method has high time requirements, time and labor consumption, and the hardness and quality of materials will change after deep processing. Structure organization There will also be some changes [3].
In the improved operation of the valve sealing structure, it is necessary to pay full attention to the scientific application of the method. The sealing surface of the valve is a hard material structure, which is relatively difficult to repair. During the improvement process, the fully threaded small bolt can be welded to the center of the end face of the valve disc. Through the Teflon plate, it is also possible to seal the gasket on the valve core through the rubber plate support and the valve disc to seal the gasket of the same size, and the gasket and the nut pressing device can be modulated, thereby ensuring the gasket and the corresponding The valves are used together.
In addition, the improvement of the butterfly valve sealing structure is also important, which needs to be elaborated accordingly. When the butterfly valve sealing structure of the current butterfly valve is under positive pressure, the sealing effect is relatively good. During the process of pressing the disc against the disc, the sealing effect is affected accordingly, especially the large-diameter valve is compared. Obvious. In the process of improving the sealing structure of the valve, it is necessary to pay more attention to the design of the structure, and it is necessary to ensure the good effect of the two-way sealing of the two-way metal sealing butterfly valve. The lower valve shaft and the valve body need to be tightly matched, which minimizes the clearance of the fit and changes the force support point of the butterfly plate in time, which can effectively reduce the deformation of the butterfly plate. Furthermore, it is necessary to realize the compensation for displacement compensation and elastic deformation through the double eccentric spherical structure and the elastic thin-walled metal ring structure. When the valve is in the open state, the stainless acid-resistant steel should be completely detached without causing wear. To avoid rusting. When the valve is closed, the butterfly plate is pressed forward, which will make the displacement inner diameter of the elastic metal sealing ring become larger, and the specific pressure value will rise, but the specific sealing pressure value of the minimum sealing can be ensured, and the reverse sealing effect is improved.
2.2 The improvement effect of the valve sealing structure can be seen from the improvement effect of the valve sealing structure. After the actual application, it has a good application effect, does not affect the flow rate of the valve runner medium, has a good sealing effect, and the sealing surface of the valve The problem of damage that cannot be fixed has been effectively solved. When the valve is leaky, the actual problem can be solved by replacing the worn gasket, which has a good cost saving effect. The soft gasket and the hard seat sealing surface form a sealing joint surface, which is a soft and hard joint seal by the improved rigid hard seal, which can effectively increase the sealing area. When there is a small damage on the sealing surface of the valve seat, it can be compensated by adjusting the opening degree of the valve screw to compress the soft gasket. Through the application of the improved valve sealing structure, the inspection is convenient and the cost is relatively low.
For the improvement of the butterfly valve sealing structure, it also has a good effect, guarantees the quality of the structural design, prolongs the service life of the two-way metal sealing butterfly valve, and can also reduce the frequency of replacement of the unit valve, so that the overall cost can be effectively reduced. Reduce work intensity and improve work efficiency as a whole.
In order to ensure the use of the valve sealing structure, it is necessary to improve the protective measures. This requires that the length of the welding bolt on the valve disc should not be too long, otherwise the sealing surface will be overhead, and the sealing effect will be affected. To choose a suitable adjustment pad, the thickness should be slightly lower than or equal to the step height of the sealing surface of the valve disc, so that the sealing surface of the gasket and the valve disc can be tightly fitted and placed on the same plane. It is also necessary to fully consider the use conditions of the fluid medium, to avoid the effects of medium corrosion and high temperature deformation on the valve sealing structure. When the damage degree of the sealing surface of the valve seat is serious, the valve seat should be disposed of, and the valve core can be matched with the valve seat of the same specification through improved performance. The adjustment valve should be marked so that it can be effectively avoided, and the opening of the valve can not affect the service life of the gasket. The application of the improved method can greatly improve the use effect of the valve sealing structure, and is suitable for a flow-line type simple shut-off valve, and the fluid structure form requires that different types of valves cannot be used.
3 Conclusion In summary, the improved application of the valve sealing structure can improve the application quality of the valve. It is necessary to do the corresponding protection work in the application of the valve, which is also an important method to extend the service life of the valve. Through the above improvement of the valve sealing structure and related application research, it is possible to theoretically have more understanding of the improvement of the valve sealing structure, so as to provide a corresponding reference for the actual improvement work. The smooth implementation of the improvement work can ensure the safety of the valve, and it is necessary to do the corresponding improvement work from the safety point of view.
References [1] Wang Hui. On the application of valve positioner in chemical production[J]. Enterprise Technology Development, 2012, 31(22): 72-73.
[2] Zhang Sha. Analysis of the improvement and application of valve sealing structure [J]. Science and Technology Innovation Guide, 2012 (14): 81.
[3] Guo Yubiao, Cao Zhongmei.Application of valve positioner in chemical production[J].Automation Application,2012(3):13,20.
Key words: valve structure improvement application CLC number: TG26 Document code: A Article ID: 1672-3791(2018)12(a)-0-02
The more prone to problems in the use of valves is the failure of strength and seals, which inevitably leads to waste of energy resources and safety problems. The improved work of the structural seal of the valve is the key to improving the quality of the valve application. Deepening the research from a theoretical level can contribute to the improved operation of the actual valve seal structure.
1 Influencing factors of valve sealing structure and application points 1.1 Analysis of influencing factors of valve sealing structure The sealing degree of the valve needs to be determined by the combination of its type and nature. The sealing degree of the valve is also related to the valve material and equipment tooling and process. Direct relationship, quality problems in any link, will inevitably affect the application quality of the valve [1]. In combination with scientific design standards, the sealing structure should be designed as a cone or a sphere, but compared with the planar sealing structure, this sealing structure will have many adverse effects, the sealing surface is prone to scratches, and there are many repairs and processing. The difficulty of this, it is also easier to increase production costs, etc., market sales will also have a big impact.
The sealing surface of the valve is designed as a cone or a spherical body, which has the influence of unfavorable factors. The flat seal design is adopted, and the sealing surface of the valve stem and the bonnet is changed from the original conical shape to a flat contact pattern. This way is limited, the device and Equipment accuracy can be guaranteed and processing is relatively easy. The length of time the valve is used is proportional to the number of valve switches, and the maintenance is also relatively easy [2].
1.2 Application of valve sealing structure In the application of valve sealing structure, it is necessary to pay attention to several aspects, and the valve can not be operated under relatively small opening conditions, and the valve needle is relatively slow to start. Therefore, the throttle interval is relatively small when the opening degree is small, and the pitch of the locking mechanism can be appropriately enlarged, the opening speed and the lift of the valve needle are increased, and the opening degree of the work is further increased, which can effectively extend the valve use. cycle.
In the practical application of the valve sealing structure, the medium temperature is relatively easy to affect the valve life cycle. Excessive medium temperature is easier to shorten the valve life. In the specific use process, it is necessary to try not to apply the valve to the high temperature medium. The pressure relief valve adds a cooling device that effectively extends the valve life cycle. To avoid the entry of impurities, this will affect the life of the needle valve [3]. In addition, regular cleaning and filtration of high-pressure medium are required. Filtration is required to filter the liquid. The number of times of use must be appropriately shortened, and the cleaning of the fuel tank should be done. Only from these aspects, full attention has been paid. In order to ensure the application quality of the valve sealing structure.
2 Improvements and improvements of the valve sealing structure 2.1 Improvements of the valve sealing structure The improvement of the valve sealing structure can improve the performance of the valve sealing structure. The industrial manufacturer's red valve sealing surface can be repaired by the corresponding Anfa. A commonly used grinding method is suitable for the case where the sealing surface of the valve is damaged to a small extent, and the grinding stone and the sandpaper can be ground by adding an appropriate abrasive. It can also be applied by deep repair method, mainly by turning machining. The application of this method has high time requirements, time and labor consumption, and the hardness and quality of materials will change after deep processing. Structure organization There will also be some changes [3].
In the improved operation of the valve sealing structure, it is necessary to pay full attention to the scientific application of the method. The sealing surface of the valve is a hard material structure, which is relatively difficult to repair. During the improvement process, the fully threaded small bolt can be welded to the center of the end face of the valve disc. Through the Teflon plate, it is also possible to seal the gasket on the valve core through the rubber plate support and the valve disc to seal the gasket of the same size, and the gasket and the nut pressing device can be modulated, thereby ensuring the gasket and the corresponding The valves are used together.
In addition, the improvement of the butterfly valve sealing structure is also important, which needs to be elaborated accordingly. When the butterfly valve sealing structure of the current butterfly valve is under positive pressure, the sealing effect is relatively good. During the process of pressing the disc against the disc, the sealing effect is affected accordingly, especially the large-diameter valve is compared. Obvious. In the process of improving the sealing structure of the valve, it is necessary to pay more attention to the design of the structure, and it is necessary to ensure the good effect of the two-way sealing of the two-way metal sealing butterfly valve. The lower valve shaft and the valve body need to be tightly matched, which minimizes the clearance of the fit and changes the force support point of the butterfly plate in time, which can effectively reduce the deformation of the butterfly plate. Furthermore, it is necessary to realize the compensation for displacement compensation and elastic deformation through the double eccentric spherical structure and the elastic thin-walled metal ring structure. When the valve is in the open state, the stainless acid-resistant steel should be completely detached without causing wear. To avoid rusting. When the valve is closed, the butterfly plate is pressed forward, which will make the displacement inner diameter of the elastic metal sealing ring become larger, and the specific pressure value will rise, but the specific sealing pressure value of the minimum sealing can be ensured, and the reverse sealing effect is improved.
2.2 The improvement effect of the valve sealing structure can be seen from the improvement effect of the valve sealing structure. After the actual application, it has a good application effect, does not affect the flow rate of the valve runner medium, has a good sealing effect, and the sealing surface of the valve The problem of damage that cannot be fixed has been effectively solved. When the valve is leaky, the actual problem can be solved by replacing the worn gasket, which has a good cost saving effect. The soft gasket and the hard seat sealing surface form a sealing joint surface, which is a soft and hard joint seal by the improved rigid hard seal, which can effectively increase the sealing area. When there is a small damage on the sealing surface of the valve seat, it can be compensated by adjusting the opening degree of the valve screw to compress the soft gasket. Through the application of the improved valve sealing structure, the inspection is convenient and the cost is relatively low.
For the improvement of the butterfly valve sealing structure, it also has a good effect, guarantees the quality of the structural design, prolongs the service life of the two-way metal sealing butterfly valve, and can also reduce the frequency of replacement of the unit valve, so that the overall cost can be effectively reduced. Reduce work intensity and improve work efficiency as a whole.
In order to ensure the use of the valve sealing structure, it is necessary to improve the protective measures. This requires that the length of the welding bolt on the valve disc should not be too long, otherwise the sealing surface will be overhead, and the sealing effect will be affected. To choose a suitable adjustment pad, the thickness should be slightly lower than or equal to the step height of the sealing surface of the valve disc, so that the sealing surface of the gasket and the valve disc can be tightly fitted and placed on the same plane. It is also necessary to fully consider the use conditions of the fluid medium, to avoid the effects of medium corrosion and high temperature deformation on the valve sealing structure. When the damage degree of the sealing surface of the valve seat is serious, the valve seat should be disposed of, and the valve core can be matched with the valve seat of the same specification through improved performance. The adjustment valve should be marked so that it can be effectively avoided, and the opening of the valve can not affect the service life of the gasket. The application of the improved method can greatly improve the use effect of the valve sealing structure, and is suitable for a flow-line type simple shut-off valve, and the fluid structure form requires that different types of valves cannot be used.
3 Conclusion In summary, the improved application of the valve sealing structure can improve the application quality of the valve. It is necessary to do the corresponding protection work in the application of the valve, which is also an important method to extend the service life of the valve. Through the above improvement of the valve sealing structure and related application research, it is possible to theoretically have more understanding of the improvement of the valve sealing structure, so as to provide a corresponding reference for the actual improvement work. The smooth implementation of the improvement work can ensure the safety of the valve, and it is necessary to do the corresponding improvement work from the safety point of view.
References [1] Wang Hui. On the application of valve positioner in chemical production[J]. Enterprise Technology Development, 2012, 31(22): 72-73.
[2] Zhang Sha. Analysis of the improvement and application of valve sealing structure [J]. Science and Technology Innovation Guide, 2012 (14): 81.
[3] Guo Yubiao, Cao Zhongmei.Application of valve positioner in chemical production[J].Automation Application,2012(3):13,20.
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