Basic maintenance steps for welded ball valves:

1. Regular inspection: Regularly check the sealing performance of the welded ball valve. If the sealing ring is found to be aged or damaged, it should be replaced in a timely manner. At the same time, check the operation of the valve. If the valve is stuck or leaking, it should be dealt with in a timely manner.

2. Cleaning: Regularly clean the interior of the welded ball valve. If impurities or corrosion are found, they should be cleaned in a timely manner. Especially the valve seat chamber, as it is the most susceptible area to contamination, it should be ensured that the valve seat moves freely.

3. Lubrication: Regularly lubricate the welded ball valve to ensure its flexibility and sealing performance. When lubricating, attention should be paid to using suitable lubricants and ensuring that the lubricant is evenly applied to the parts that need to be lubricated.

4. Operating standards: When operating welded ball valves, the correct operating procedures should be followed to avoid valve damage caused by improper operation. The fasteners of the valve should be regularly inspected to ensure that they are in the appropriate torque state.

5. Maintenance records: Maintain detailed maintenance records, including maintenance dates, maintenance content, replaced parts, and other information, in order to track the maintenance history of the valve and predict future maintenance needs.

6. Preventive measures: After heating or cooling is completed, the ball valve should be closed in place and maintained with full water to prevent oxidation and corrosion of the pipeline and valve.