1、 The function of electric switch is very powerful, and its application ability and scope are very wide and powerful. 　　

2. After the active switch to manual status, the switch cannot return to active status; Because the field operator used too much force to pull the clutch too much, the internal gear was stuck and the drive could not be pulled back. Solution: When pulling the clutch, the hand wheel should be rotated back and forth to disengage the internal turbine, and then the manual active switching can be easily achieved (when manually active switching, the yellow colored ferrule beside must be pulled up). Precautions for field application of pneumatic butterfly valve