1. Manual ball valves should be stored in a dry, well-ventilated warehouse, with both ends of the passage plugged. Moisture will significantly affect performance and may even render the valve unusable.

2. If the manual ball valve is not used for an extended period, it must be inspected regularly. Clean any dirt or grime promptly and apply rust-preventive oil to the machined surfaces. This will ensure the valve remains in optimal condition and maintains high efficiency whenever it is used.

3. Proper installation and regular inspection are crucial for manual ball valves. Check the sealing surfaces for wear; replace worn surfaces if necessary. Also check the packing material; repair or replace damaged parts. Perform a sealing test; poor sealing will significantly reduce performance.

4. Never bump or strike the manual ball valve, and never place heavy objects on it. Operate the valve with a qualified professional to avoid operational errors and potential risks.

In conclusion, the maintenance of manual ball valves is essential. Proper maintenance ensures the equipment serves industrial production better and extends its lifespan. Maintaining manual ball valves is not difficult; the key is consistency. Following the methods described above consistently will yield results.