Regarding air leakage caused by rust on the inner wall of the cylinder of the triple-eccentric butterfly valve
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Several of the company’s indoor three-eccentric butterfly valve actuators have experienced rust on their inner walls; as a result, the sealing rings wear out, which leads to air leakage, making it impossible to open the valves, or causing them to open slowly or not to reach the full opening degree. Has anyone encountered this problem? What could be the reason?
Rust formation on the inner wall of the cylinder of a triple-eccentric butterfly valve may be caused by high environmental humidity or the presence of moisture inside the cylinder for an extended period, leading to an oxidation reaction on the metal surface. The wear of the sealing ring may be caused by the rusted inner wall, which subjectes the sealing ring to greater friction during movement, thereby accelerating its wear. The combination of rust and wear in this way leads to a decrease in airtightness, which in turn results in air leakage and affects the proper opening and closing of the butterfly valve. It is recommended to check and adjust the indoor humidity, regularly inspect the interior of the cylinder, and promptly clean or replace any damaged seals in order to ensure the proper operation of the butterfly valve. .
Solving such problems should involve two aspects: first, the physical and chemical conditions of the medium in terms of processing techniques must meet the requirements of the valve material, in order to reduce its corrosive effect on the valve. Another point is whether the requirements regarding the application scope of the valves meet the production needs. The second is regular maintenance in terms of machinery. In this current state, it needs to be polished, welded, ground, and repaired. Soft-sealed ones can be replaced regularly, while hard-sealed ones need to be polished and repositioned. For reference.
Worn seal ring? Could the poster please introduce the diameter of the butterfly valve used, as well as the operating environment?
High moisture in the cylinder causes corrosion. It doesn’t seem too serious; just sand it smooth with fine sandpaper, replace the seal ring and use it again. Pay special attention to this valve – check the seal ring every time it’s serviced. Of course, it would be better if it’s possible to replace the cylinder.
It is recommended to electroplate or spray Teflon on the inner wall of the cylinder barrel as an anti-corrosion measure, provided that the inner wall of the cylinder barrel is rewelded, or the piston structure is modified to eliminate the scraping effect; this way, even in the event of leakage, the inner wall will not be corroded