Maintenance of ball valves

Maintenance of ball valves

1. It is necessary to confirm that the pressure in the upstream and downstream pipelines of the ball valve has been relieved before proceeding with disassembly and assembly operations.

2. Be careful during disassembly and reassembly to prevent damage to the sealing surface of the parts, especially non-metallic parts. Special tools should be used when removing the O-ring.

3. The bolts on the flange must be tightened symmetrically, gradually, and evenly during assembly.

4. The cleaning agent should be compatible with the rubber parts, plastic parts, metal parts, and working media (such as gas) in the ball valve. When the working medium is gas, gasoline (GB484-89) can be used to clean metal parts. Non metallic parts should be cleaned with purified water or alcohol.

5. The decomposed individual parts can be cleaned by immersion washing. Metal parts that have not yet decomposed can be cleaned with a clean and fine silk cloth soaked in cleaning agent (to prevent fibers from falling off and adhering to the parts). When cleaning, it is necessary to remove grease, dirt, adhesive buildup, dust, etc. that adhere to the wall surface.

6. Non metallic parts should be immediately removed from the cleaning agent after cleaning and should not be soaked for a long time.

7. After cleaning, it is necessary to wait for the wall cleaning agent to evaporate (which can be wiped with a silk cloth that has not been soaked in cleaning agent) before assembly, but it should not be left for a long time, otherwise it will rust and be contaminated by dust.

8. New parts also need to be cleaned thoroughly before assembly.

9. Lubricate with grease. Lubricating grease should be compatible with the metal material, rubber parts, plastic parts, and working medium of the ball valve. When the working medium is gas, special 221 lubricating grease can be used, for example. Apply a thin layer of grease on the surface of the seal installation groove, a thin layer of grease on the rubber seal, and a thin layer of grease on the sealing and friction surfaces of the valve stem.

10. During assembly, metal debris, fibers, grease (excluding those specified for use), dust, and other impurities, foreign objects, etc. should not be allowed to contaminate, adhere, or remain on the surface of the parts or enter the internal cavity.