4. Operation and use
1) Before operation, it must be acknowledged that pipelines and valves have been washed. 　　
2) The operation of the valve drives the valve rod to rotate and complete according to the size of the input signal of the actuator: when the valve rotates 1/4 circle (90 °) in the positive direction, the valve is closed. When the valve is rotated 1/4 turn (90 °) in the opposite direction, the valve is open. 　　
3) When the direction indicating arrow of the actuator is parallel to the pipeline, the valve is open; When the arrow is straight with the pipeline, the valve is closed. 　
2. The repair has a long service life and repair free period, which will depend on the following elements: normal working conditions, temperature/pressure ratio for consistent reconciliation, and reasonable corrosion data

In addition, because we are not professional maintenance personnel, although the maintenance of pneumatic ball valve is relatively simple, we do not have any experience, so in this case, we suggest that everyone should not try to repair it, otherwise there may be more serious problems. So at this time, what we need to do is to call the after-sales phone immediately or find a professional person to help repair the pneumatic ball valve.