4、 Precautions for repair and maintenance of pneumatic ball valve:
(1) After running the pipeline system for a period of time, the movable ball valve often suffers from natural loss and some faults, so it is necessary to carry out regular maintenance and overhaul.
(2) Online maintenance of pneumatic ball valve
1. Close the upstream and downstream block valves of the ball valve. Bleed to remove the pressure in the pipeline before and after the ball valve.
2. Keep the pneumatic ball valve fully closed. Remove the startup pipeline.
3. Screw out the screws to remove the pneumatic actuator and driver flange together.
4. Remove the key on the valve rod, unscrew the screw, remove the packing gland and take out the packing.
5. Take out the O-ring from the packing gland.
6. Check the removed parts, repair or replace them if damaged, and clean all parts.
7. Clean and lubricate the sealing surface of stuffing box and O-ring installation groove.
8. Install new packing and new O-ring.
9. Install the packing gland, fasten it with screws, and install the key.
10. Install the pneumatic actuator flange and driver together and fasten them with screws.
11. Connect the pneumatic pipeline and operate the driver to check the opening and closing flexibility of the valve.
12. Install the pipeline and conduct air tightness test according to the pipeline requirements

Factors affecting the service life of pneumatic butterfly valve
The service life of pneumatic butterfly valve is affected by many factors. What are the detailed factors? Let me analyze them for you.
First, the service life is usually affected due to improper use, which mainly includes unreasonable devices, relatively violent pressure shocks, easy to form rubber hoses and burst.
Second, the length, steel wire layers, joint shape and size of the selected hose should be reasonable, and the bending level of the hose should be minimized. Large bending and twisting will greatly reduce the service life of the hose, and some corresponding measures should be taken in the parts prone to friction.
After knowing the above influencing factors, users need to pay more attention to the maintenance of pneumatic butterfly valves.