In industrial fluid control systems, the sealing performance of manual valves is crucial to the safety, stability and efficiency of the system. In actual operation, due to the combined effect of multiple factors, the sealing performance of manual valves may gradually decline. This may not only cause fluid leakage, thereby affecting production efficiency, but also pose a potential threat to the environment and personnel safety.
Analysis of the reasons for the decline in sealing performance
Aging of sealing materials
The sealing materials of manual valves, such as rubber sealing rings and plastic gaskets, may age due to corrosion of the medium, temperature changes and the passage of time as the service time increases, resulting in a significant decline in sealing performance. Chemical changes during the aging process will cause the material to lose its elasticity and sealing ability, increasing the risk of leakage.
Wear of sealing surface
The sealing surface between the valve seat and the valve disc may gradually wear due to the scouring and friction of the medium during the long-term opening and closing process. Wear will cause the sealing surface to be uneven, thereby affecting the sealing effect, causing fluid leakage and pressure loss.
Loose or damaged bolts
The connecting parts of the manual valve, especially the bolts of the flange connection, are prone to loosening or damage if they are not tightened as required or are affected by vibration for a long time. This situation will lead to an increase in the gap between the sealing surfaces, directly reducing the sealing performance and increasing the risk of leakage.
Accumulation of impurities and sediments
The accumulation of impurities and sediments in the medium inside the manual valve may cause blockage or damage to the sealing surface. This situation will significantly affect the sealing effect of the valve and reduce the overall efficiency of the system.
Improper operation
Improper operation of the manual valve, such as excessive force or frequent operation, may damage the sealing surface and further reduce the sealing performance. The operator's experience and operating specifications are particularly important in this process.
Solution
Replacement of sealing materials
For the performance degradation caused by aging of sealing materials, it is crucial to replace new sealing materials in time. When selecting new sealing materials, the properties of the medium, operating temperature and pressure should be comprehensively considered to ensure that the selected materials have good corrosion resistance, high temperature resistance and wear resistance to restore the sealing performance of the valve.
Grinding and repairing the sealing surface
For the performance degradation caused by wear of the sealing surface, fine grinding with professional grinding tools and abrasives is an effective solution. By restoring the flatness and finish of the sealing surface, the sealing effect can be significantly improved. Quality inspection is required after grinding to ensure that the sealing surface meets the design requirements.
Tighten and replace bolts
For the problem of loose or damaged bolts, it is necessary to regularly check the tightness and integrity of the bolts. If the bolts are found to be loose, they should be tightened with appropriate tools; if the bolts are damaged, they should be replaced in time, and the specifications and materials of the new bolts should be consistent with the original design to maintain a good connection.
Clean impurities and sediments
Regularly cleaning impurities and sediments inside the manual valve is an important measure to maintain sealing performance. Use professional cleaning agents and tools to thoroughly clean the manual valve to ensure that there is no blockage inside and maintain smooth flow of fluid.
Optimize operation methods
In order to reduce the decline in sealing performance caused by improper operation, it is crucial to optimize the operation method of the manual valve. Operators should avoid excessive force and frequent operation to maintain the stability and balance of the valve. For manual valves that require frequent operation, it is recommended to consider installing auxiliary devices such as positioners or limiters to reduce potential damage to the sealing surface.
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