Ten Points for Attention in Repairing Two-piece Internal Screw Ball Valve
(1) The disassembly and decomposition operation can be carried out only after the pressure has been removed from the upstream and downstream pipelines of the ball valve.
(2) The non-metal parts shall be immediately removed from the cleaning agent after cleaning, and shall not be soaked for a long time.
(3) Bolts on the flange shall be tightened symmetrically, step by step and uniformly during assembly.
(4) The cleaning agent should be compatible with rubber, plastic, metal and working medium (such as gas) in the ball valve. When the working medium is gas, the metal parts can be cleaned with gasoline (gb484-89). Clean the non-metal parts with clean water or alcohol.
(5) Each individual ball valve part can be cleaned by soaking. The metal parts of the non-metal parts that have not been decomposed can be scrubbed with a clean, fine cloth impregnated with a cleaning agent. When cleaning, remove all oil, dirt, glue, dust and so on that adhere to the wall surface.
(6) When the ball valve is decomposed and reassembled, the sealing cover of the parts must be carefully prevented from being damaged, especially the non-metal parts. Special tools should be used when removing the O-ring.
(7) After cleaning, assembly shall be carried out after the wall cleaning agent is volatilized, but it shall not be used for a long time, otherwise it will rust and be contaminated by dust.
(8) New parts should also be cleaned before assembly.
(9) Use grease to lubricate. The grease should be compatible with the metal, rubber, plastic and working medium of the ball valve. When the working medium is gas, we can use such as 221 grease. Apply a thin layer of grease to the surface of the sealing element mounting groove, a thin layer of grease to the rubber sealing element, a thin layer of grease to the sealing cover of the stem and the friction surface.
(10) Metal fragments, fibers, grease and dust, other impurities and foreign matters shall not be allowed to contaminate, adhere or stay on the surface of parts or enter the inner cavity during assembly.