Of course, if you want to achieve valve positioning, you need to install a pneumatic positioning valve to modify the pipeline connection. You can use a self-locking valve to directly control the positioning valve, and use a solenoid valve, a one-way valve, etc. 　　　　

Operating principle of pneumatic butterfly valve: pneumatic butterfly valve is equipped with pneumatic actuator to replace manual operation. Its operating principle is to use compressed air as the power source to drive the valve rod to roll, and the valve rod drives the disc shaped butterfly plate to rotate. The initial orientation of the butterfly plate is determined according to practical needs. The butterfly plate rotates from the initial orientation. When the butterfly plate rotates to 90 ° with the valve body, the pneumatic butterfly valve is fully open. When the butterfly valve rotates to 0 ° or 180 ° with the valve body, the pneumatic butterfly valve is closed. The pneumatic actuator of the pneumatic butterfly valve runs fast and is seldom damaged due to jamming during the action execution.