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A longer service life of a ball valve relies on the following factors:  

1. Normal working conditions.
2. Maintain the temperature properly proportional to the pressure.
3. When the ball valve is closed, there is still pressurized fluid inside the valve body.

Before disassembly, it is necessary to check the upstream and downstream sides of the ball valve to ensure that there is no pressure in the pipes on the both sides. When reassembly, remember to take care to avoid damaging the sealing surfaces of parts, especially non-metallic parts. Use special tools to reassemble ball valves, and screw down flange bolts symmetrically and evenly.

Regarding cleaning, the cleaning agent should be compatible with rubber parts, plastic parts, metal parts and working media of the ball valve. For example, when the working medium is gas, metal parts can be cleaned with gasoline, and the non-metal parts are cleaned with purified water or alcohol. When the non-metal parts are cleaned, attention should be paid not to soak them for a long time. After all parts are washed, assemble them after the cleaning agent volatilizes or is wiped off. However, those parts can't be put on hold for a long time, or they will rust and be polluted by dust. And during assembly, metal chips, fibers, grease and other impurities are not allowed to adhere to the surface of the parts or enter the inner cavity. In addition, if there is a valve packing leak, the stem nut should be screwed down again.

Use grease, which should also be compatible with metal materials, rubber parts, plastic parts, and working media of ball valves. Coat the surface of the seal mounting groove, the rubber seal and the sealing surface of the valve stem with a thin layer of grease.