(1) It is necessary to verify that the pressure has been removed from the upper and downstream pipe of the ball valve before disassembling and decomposing.
(2)During decomposition and reassembly, care should be taken to prevent damage to the sealing surface of parts, especially non-metallic parts. Special tools should be used when taking out O-rings.
(3)The bolts on the flange should be tightened symmetrically, step by step and evenly during assembly.
(4)The cleaning agent must be compatible with the rubber parts, plastic parts, metal parts, and working media (such as gas) in the ball valve. Working medium for gas, available gasoline (GB484-89) cleaning metal parts. Non-metallic parts should be cleaned with pure water or alcohol.
(5)The broken down individual parts can be cleaned by dipping. Metallic parts that have not been decomposed can be scrubbed with clean, fine and clean silk cloth impregnated with cleaning agent (to avoid fiber shedding and adhesion to parts). When cleaning, all grease, dirt, glue and dust adhering to the wall must be removed.
(6)Non-metallic parts should be removed from the cleaning agent immediately after cleaning, not long time soaking.
(7)After cleaning, it is necessary to be assembled after the volatilization of cleaning agent on the washed wall surface (the silk cloth can be wiped without immersion cleaning agent), but it shall not be used for a long time, otherwise it will rust and be polluted by dust.
(8)New parts also need to be cleaned before assembly.
(9)Use grease for lubrication.Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working media. When the working medium is gas, such as special 221 grease can be used. Apply a thin layer of grease to the surface of the seal mounting tank, a thin layer of grease to the rubber seal, and a thin layer of grease to the sealing surface and friction surface of the valve stem.
(10)During assembly, metal debris, fibers, grease (except those prescribed for use), dust, other impurities, foreign bodies and other contamination, adhesion or stay on the surface of the parts or into the inner cavity shall not be allowed