The pneumatic ball valve of the filling machine is usually formed by the pneumatic actuator, valve, positioner and other connecting devices after debugging. The actuator is the thrust component of the conditioning valve, which generates the corresponding thrust according to the size of the control signal pressure to promote the action of the conditioning organization. The valve body is the conditioning part of the pneumatic conditioning valve. It directly touches the conditioning medium to regulate the flow of the fluid. 　

According to the action mode, it can be classified into switching type and regulating type. The switch type is to connect the power supply directly and complete the switch action through the positive and negative directions of the switch. The regulating type takes the power supply as the power source and receives the parameter value 4~20mA (weak current control such as 0~5) signal preset by the industrial automation control system to complete the regulating action. Advantages of electric butterfly valve: 1. The electric butterfly valve can be opened and closed easily and quickly, labor-saving, with small fluid resistance, and can be operated frequently. 2. The electric butterfly valve has simple structure, small volume and light weight. 3. The electric butterfly valve can transport mud, and the liquid accumulated at the pipe mouth is the least. 4. The electric butterfly valve can achieve good sealing under low pressure. 5. The electric butterfly valve has good regulation performance.