How to ask for help for the double-acting TYC positioner of Linuo pneumatic V-shaped regulating ball valve?

When the input signal increases, that is, the signal of 4-20MA increases, the torque motor ① generates an electromagnetic field, and the baffle ② is forced away from the nozzle ③ by the electromagnetic field. The distance between the nozzle (③) and the baffle (②) becomes larger, and the air pressure above the valve core (⑤) in the pilot valve (④) is discharged. The affected valve core (⑤) moves to the right, pushing the valve core (⑧) to block the base (⑦), and the air pressure is input to the actuator (⑦) through the base (⑦). Air chamber with actuator (? ) internal pressure increases, the actuator push rod (? ) down, through the feedback lever (? ) Push the actuator lever (? ) displacement changes to the skateboard (? )。 This displacement change is transmitted to the range (? ) Feedback lever, pull the range spring (). When the forces of the range spring () and the torque motor (①) are balanced, the baffle (②) returns to its original position, thus reducing the distance from the nozzle (③). As the amount of air discharged through the nozzle (③) decreases, the air pressure above the slide valve (⑤) increases. When the valve core (⑤) returns to its original position, the valve core (⑧) blocks the base (⑦) again and stops inputting air pressure to the actuator (⑦). When the actuator (⑩) stops moving, the positioner remains in a stable state.