- Preparation before installation of flange ball valve
1. The front and rear pipes should be coaxial, and the sealing surfaces of the two flanges should be parallel. The pipe should be able to bear the weight of the ball valve, otherwise the pipe must be equipped with appropriate supports.
2. Blow clean the pipelines before and after the valve to remove oil stains, welding slag and all other impurities in the pipelines.
3. Check the mark of the ball valve to make sure it is intact. Open and close the valve several times to verify that it is working properly.
4. Remove the protective parts on the connecting flanges at both ends of the ball valve.
5. Check the valve hole to remove possible dirt, and then clean the valve hole. Even small particles of foreign matter between the valve seat and the ball may damage the valve seat sealing surface.
- Flange ball valve installation steps
1. Install the ball valve on the pipeline. Either end of the ball valve can be installed on the upstream end. The handle-driven ball valve can be installed anywhere on the pipeline. However, ball valves with gearboxes or pneumatic valves should be installed upright, that is, installed on horizontal pipes, with the driving device above the pipes.
2. Install a sealing gasket between the valve flange and the pipeline flange according to the pipeline design requirements.
3. The bolts on the flange must be tightened symmetrically, successively and evenly.
- Inspection after installation of flange ball valve
1. Operate the driver to open and close the ball valve several times. It should be flexible and without sluggishness to confirm that it is working normally.
2. Check the sealing performance of the flange joint surface between the pipeline and the ball valve according to the pipeline design requirements.
- Use of flange ball valve
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 disassembly.
2. Non-metal parts should be taken out of the cleaning agent immediately after cleaning and should not be soaked for a long time.
3. During assembly, the bolts on the flange must be tightened symmetrically, gradually and evenly.
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. Clean non-metal parts with pure water or alcohol.
5. Each disassembled ball valve part can be cleaned by dipping. Metal parts that still have undecomposed non-metallic parts can be scrubbed with a clean, fine silk cloth soaked in cleaning agent (to prevent fibers from falling off and adhering to the parts). During cleaning, all grease, dirt, glue, dust, etc. adhering to the wall surface must be removed.
6. When disassembling and reassembling the ball valve, care must be taken to prevent damage to the sealing surface of the parts, especially non-metallic parts. Special tools should be used when removing the O-ring.
7. After cleaning, it is necessary to wait for the cleaning agent on the wall to be washed to evaporate (it can be wiped with a silk cloth not soaked in cleaning agent) before assembly, but it must not be left aside for a long time, otherwise it will rust and be contaminated 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, 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.
10. During assembly, metal chips, fibers, grease (except those specified for use), dust and other impurities, foreign matter, etc. should not be allowed to contaminate, adhere to, or stay on the surface of the part or enter the inner cavity.