Eccentric butterfly valves, as a commonly used valve type, are widely applied in fluid control systems. To ensure their normal operation and extend their service life, regular maintenance and care are particularly important. The following is a detailed article on the daily care of eccentric butterfly valves.

1. Cleaning Work

1. External Cleaning:
   • Regularly inspect the appearance of the eccentric butterfly valve to ensure there are no damages, leaks, or deformations.
   • Use a clean cloth and appropriate cleaning agents to clean the external surface of the valve body, removing dirt and deposits.
2. Internal Cleaning:
   • Close the valve to ensure no fluid is flowing inside.
   • Use a clean cloth, brush, and appropriate cleaning agents to clean the interior of the valve body, especially the butterfly plate and sealing surfaces, to prevent leaks caused by corrosion or contamination.

2. Lubrication Maintenance

1. Lubricating Components:
   • Regularly check the lubrication status of various moving parts of the eccentric butterfly valve, such as the valve stem and drive mechanism.
   • Use suitable lubricants and lubricate regularly according to the manufacturer's requirements to reduce friction and wear.
2. Lubricant Selection:
   • Choose appropriate lubricants that will not chemically react with the fluid and have good lubrication properties.

3. Sealing Performance Check

1. Sealing Surface Inspection:
   • Regularly check the sealing surfaces of the eccentric butterfly valve for wear, scratches, or corrosion.
   • If necessary, replace sealing components in a timely manner to ensure the sealing performance of the valve.
2. Sealing Performance Testing:
   • Regularly test the sealing performance of the valve, which can be done through pressure tests or vacuum tests.
   • If leaks or poor sealing performance are found, the cause should be identified and repaired or replaced immediately.

4. Operation Mechanism Inspection

1. Check the Operation Mechanism:
   • Regularly check the operation mechanism of the eccentric butterfly valve, such as handwheels and motors, to ensure they are functioning properly.
   • If any damage or faults are found, repair or replace them promptly.
2. Smooth Operation:
   • Ensure that the operating lever and handle can operate smoothly without jamming, looseness, or wear.

5. Attention to Operating Environment

1. Avoid Harsh Environments:
   • Avoid allowing the eccentric butterfly valve to operate in harsh environments such as high temperatures and high pressures for extended periods to prevent damage to the valve.
2. Choose Appropriate Materials:
   • Select suitable valve materials and sealing materials based on the requirements of the working environment to enhance the valve's corrosion resistance and high-temperature resistance.

6. Regular Inspection and Maintenance

1. Comprehensive Inspection:
   • Regularly conduct comprehensive inspections of all components and connections of the eccentric butterfly valve to ensure they are functioning properly.
   • If any parts are found to be worn, cracked, or loose, they should be repaired or replaced promptly.
2. Maintenance Records:
   • Record the details of each maintenance activity, including maintenance time, specific operations performed, replaced components, and any issues found.
   • This facilitates subsequent tracking and comparative analysis, providing a reference for future maintenance.

7. Precautions

1. Avoid Excessive Opening and Closing:
   • During use, avoid excessive opening and closing of the valve to prevent damage to the butterfly plate and sealing surfaces.
2. Protection for Long-Term Non-Use:
   • For valves that will not be used for a long time, take appropriate protective measures, such as installing blind plates to protect the flange sealing surfaces from corrosion and damage.
3. Professional Repair:
   • If serious faults or unresolved issues are found with the valve, promptly contact professional repair personnel for maintenance or replacement.

Through the above daily care, the normal operation of the eccentric butterfly valve can be ensured, and its service life can be extended. At the same time, establishing a comprehensive record management system and documenting maintenance activities provides a reference for future maintenance, further enhancing the reliability and safety of the valve.