Precautions for ball valve repair and maintenance

●When the ball valve is closed, there is still pressurized fluid inside the valve body.

●Before servicing the ball valve, relieve the pipeline pressure and keep the valve in the open position.

●Before repairing the ball valve, disconnect the power or air source.

●Before maintenance, disengage the actuator from the bracket.

●It is necessary to find out that the upstream and downstream pipelines of the ball valve have been relieved of pressure before disassembly and decomposition can be carried out.

●During disassembly and reassembly, care must be taken to prevent damage to the sealing surface of parts, especially non-metal parts. Special tools should be used when removing O-rings.

●When assembling the ball valve, the bolts on the flange must be tightened symmetrically, gradually and evenly.

●The cleaning agent should be compatible with rubber parts, plastic parts, metal parts and working medium (such as gas) in the ball valve. When the working medium is gas, gasoline can be used to clean the metal parts. Clean non-metal parts with pure water or alcohol.

●The disassembled individual parts can be cleaned by dipping. Metal parts with undecomposed non-metal parts can be scrubbed with a clean, fine silk cloth impregnated with cleaning agent (to prevent fibers from falling off and adhering to the parts). When cleaning, remove all grease, dirt, glue, dust, etc. adhering to the wall surface.

●Non-metal parts should be taken out of the cleaning agent immediately after cleaning, and should not be soaked for a long time.

●After cleaning, it needs to be assembled after the cleaning agent of the washed wall surface is volatilized (can be wiped with a silk cloth not soaked in cleaning agent), but it should not be left for a long time, otherwise it will rust and be contaminated by dust
●New parts also need to be cleaned before assembling.

●Use grease for lubrication. Grease should be compatible with ball valve metal materials, rubber parts, plastic parts and working medium. When the working medium is gas, for example, special 221 grease can be used. Apply a thin layer of grease on the surface of the seal installation groove, apply a thin layer of grease on the rubber seal, and apply a thin layer of grease on the sealing surface and friction surface of the valve stem.

●When assembling, it should not be allowed to pollute, adhere to or stay on the surface of the parts or enter the cavity with metal chips, fibers, grease (except those specified for use), dust, other impurities, and foreign objects.