Fourthly, the valve rod of the electric butterfly valve is of through rod structure. After quenching and tempering treatment, it has good comprehensive mechanical properties and scratch resistance, and there is no need to worry about being corroded by articles. One thing we should pay attention to is that the valve rod of the electric butterfly valve does not operate up and down, only rotates, and does not have to worry about the packing problem. It is not easy to be damaged and has good sealing performance. It is fixed with the taper pin of the butterfly plate, and the extended section is designed to prevent the valve rod from collapsing due to the accidental fracture of the connection between the butterfly plate and the valve rod.

Second, the working principle is to connect the circuit. When the piston actuator is connected to the air source, the air in the pipe flows into the cylinder to push the pneumatic piston to move to one end, thus making the rotating shaft rotate 90 degrees around the axis.