The installation method of flange manual ball valve is as follows:

1. The front and rear pipelines of the manual ball valve have been prepared. The front and rear pipelines should be coaxial, the sealing surfaces of the two flanges should be parallel, and the pipelines should be able to bear the weight of the ball valve. Otherwise, the pipelines 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 and fully open and close the valve several times to confirm 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.

6. Install the valve on the pipeline. Either end of the valve can be installed on the upstream end.

7. The valve driven by the handle can be installed at any position on the pipeline. However, ball valves with gearboxes or pneumatic actuators should be installed upright, that is, installed on horizontal pipes, with the driving device above the pipe.

8. Install a sealing gasket between the valve flange and the pipeline flange according to the pipeline design requirements.

9. The bolts on the flange must be tightened symmetrically, successively and evenly.