A long service life and maintenance-free period depend on several factors: normal operating conditions, maintaining a harmonious temperature/pressure ratio, and reasonable corrosion data. Even when the ball valve is closed, pressurized fluid still exists inside the valve body.
Before maintenance: release pipeline pressure and place the valve in the open position; disconnect the power or gas supply; detach the actuator from the support.
Disassembly and reassembly must only be performed after confirming that the upstream and downstream pipelines of the ball valve have been depressurized.
During disassembly and reassembly, care must be taken to prevent damage to the sealing surfaces of parts, especially non-metallic parts. Special tools should be used when removing O-rings.
During reassembly, the bolts on the flange must be tightened symmetrically, gradually, and evenly.
The cleaning agent should be compatible with the rubber, plastic, and metal parts in the ball valve, as well as the working medium (e.g., natural gas). When the working medium is natural gas, gasoline (GB484-89) can be used to clean the metal parts. Non-metallic parts should be cleaned with pure water or alcohol. After cleaning, non-metallic parts should be removed from the cleaning agent immediately and should not be soaked for extended periods. After cleaning, allow the cleaning agent on the cleaned surfaces to evaporate (you can wipe them with a cloth that is not soaked in the cleaning agent) before assembly. Do not leave them for extended periods, otherwise they may rust or become contaminated with dust. New parts must also be cleaned before assembly. During assembly, metal shavings, fibers, grease (except for those specified for use), dust, and other impurities or foreign objects should not be allowed to contaminate, adhere to, or remain on the surface of the parts or enter the internal cavity. If a slight leak occurs at the packing, the valve stem nut must be tightened again.
