(1) Disassembly and disassembly operations can only be carried out after confirming that the pressure in the upstream and downstream pipelines of the ball valve has been released.
(2) Non-metallic parts should be removed from the cleaning agent immediately after cleaning and should not be soaked for a long time.
(3) During assembly, the bolts on the flange must be tightened symmetrically, gradually, and evenly.
(4) 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.
(5) Each disassembled individual ball valve part can be cleaned by immersion. Metal parts with remaining non-metallic components can be wiped with a clean, fine cloth soaked in cleaning agent (to avoid fiber shedding and adhesion to the parts). During cleaning, all grease, dirt, accumulated glue, dust, etc., adhering to the wall surface must be removed. (6) When disassembling and reassembling the ball valve, care must be taken to prevent damage to the sealing surfaces of the parts, especially non-metallic parts. A special tool should be used when removing the O-ring.
(7) After cleaning, allow the cleaning agent on the cleaned surfaces to evaporate (you can wipe with a cloth not soaked in cleaning agent) before reassembling. Do not leave them for extended periods, otherwise they will rust or become contaminated with dust.
(8) New parts must also be cleaned before assembly.
(9) Use grease for lubrication. The grease should be compatible with the ball valve's metal materials, rubber parts, plastic parts, and working medium. When the working medium is gas, grease such as Special 221 can be used. Apply a thin layer of grease to the surface of the seal mounting groove, a thin layer of grease to the rubber seal, and a thin layer of grease to the sealing and friction surfaces of the valve stem.
(10) During assembly, metal shavings, fibers, grease (except for those specified), dust, and other impurities or foreign matter should not be allowed to contaminate, adhere to, or remain on the surface of the parts or enter the internal cavity.
