Electric ball valve is a kind of valve used to control pipeline medium and realize remote control. It is an important equipment in industrial automation control system at present. Including pneumatic ball valve, and other valves in the use process can not be continuous. After storage or use for a certain period of time, if you want to continue to ensure its effective work and appropriately extend its service life, maintenance and repair are necessary.

1. When the electric ball valve is closed, there is still pressure fluid inside the valve body;
2. Before maintenance, release the pipeline pressure and keep the valve in the open position; disconnect the power or air source; separate the actuator from the bracket;
3. It is necessary to find out that the pressure of the upstream and downstream pipes of the electric ball valve has been removed before disassembling;
4. During disassembly and reassembly, care must be taken to prevent damage to the sealing surface of parts, especially non-metallic parts. Special tools should be used when taking out the O-ring;
5. During assembly, the bolts on the flange must be tightened symmetrically, step by step and evenly;
6. The cleaning agent shall 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, the metal parts can be cleaned with gasoline (gb484-89). Clean non-metallic parts with pure water or alcohol;
7. The disassembled individual parts can be washed by immersion. For the metal parts that have not been decomposed, clean and fine silk cloth impregnated with cleaning agent (to avoid fiber falling off and adhering to the parts) can be used for scrubbing. During cleaning, all grease, dirt, glue and dust adhering to the wall shall be removed;
8. The non-metallic parts shall be taken out of the cleaning agent immediately after cleaning, and shall not be soaked for a long time;
9. After cleaning, it needs to be assembled after the cleaning agent on the washed wall evaporates (it can be wiped by the silk cloth without cleaning agent), but it can not be used for a long time, otherwise it will rust and be polluted by dust;
10. New parts shall also be cleaned before assembly;
11. Lubricate with grease. The grease shall be compatible with metal materials, rubber parts, plastic parts and working media of ball valve. When the working medium is gas, for example, te221 grease can be used. Apply a thin layer of grease on the surface of the seal installation groove, rubber seal, and valve rod sealing surface and friction surface;
12. During assembly, it is not allowed to contaminate, adhere to or stay on the surface of the parts or enter the inner cavity with metal chips, fibers, grease (except for those specified to be used) dust and other impurities and foreign matters.