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Failures and elimination methods of sanitary large-diameter butterfly valves:

by:Mayer     2021-08-20
Requirements and protection of sanitary large-diameter butterfly valves:     prolong the life of the valve and ensure the sanitary requirements of the valve. The metal surface of the valve must be painted, and the thickness of the coating must be guaranteed. Near white level), and thermal spraying is recommended. The outer surface of the valve installed in the open should be coated with UV-resistant acrylic paint. The failure of the sanitary large-diameter butterfly valve and the elimination method:    1. Before installation, please confirm whether the product performance and the medium flow direction arrow are consistent with the movement conditions, and the valve cavity is inserted and cleaned. It is not allowed to have on the sealing ring and butterfly plate. Impurities and foreign matter are attached. Never close the butterfly plate before cleaning to avoid damaging the sealing ring.  2. It is recommended to use the special flange for the butterfly valve, that is, the HGJ54-91 type socket welded steel flange.  3. The best position for installation in the pipeline is vertical installation, but not upside-down installation.  4. It is necessary to adjust the flow during use, and it is controlled by a worm gear box.  5. For the butterfly valve with a large number of opening and closing times, open the worm gear box cover in about two months to check whether the butter is normal. Keep a proper amount of butter.  6. u200bu200bCheck the tightness of each connection part, which not only guarantees the bee-like nature of the packing, but also ensures the flexible rotation of the valve stem.  7. The metal-sealed sanitary butterfly valve is not suitable for installation at the end of the pipeline. If it must be installed at the end of the pipeline, an outlet flange must be installed to prevent the backlog and over-position of the sealing ring.   8. Valve stem installation and use response Periodically check the valve use effect, and promptly remove any faults found. 9. The timely elimination methods of possible failures are shown in the following table: Common failures and solutions of sanitary butterfly valves. Key repair parts of sanitary butterfly valves For impact and corrosion, the pressure and corrosion resistance and wear and aging conditions must be checked. If the corrosion is strong, the fluorine rubber valve seat can be replaced. Butterfly plate: The butterfly plate is one of the movable parts of the sanitary large-diameter butterfly valve. It is more severely eroded by the medium. When overhauling, carefully check whether each part of the valve core is corroded and worn, especially in the case of high pressure difference. The wear of the core is more serious due to cavitation caused by cavitation. Severely damaged spools should be replaced.   Check whether the rubber film in the actuator is aging or cracked. Reasons and solutions for possible failures of sanitary large-diameter butterfly valves 1. Leakage of the sealing surface 1. The butterfly plate and the sealing surface contain debris 2. The butterfly plate and the sealing surface close position incorrectly 3. The sealing surface and the butterfly plate are in contact with Guo Mi Solution to cause damage 1. Eliminate impurities, clean the valve cavity 2. Adjust the worm gear or the adjusting screw of the electric actuator to achieve the correct closing position of the valve 3. Check the mounting flange plane and the bolt pressing country, and it should be evenly pressed 4. , Press in the direction of the tip seal
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