AT pneumatic actuator is a common pneumatic actuator, which is designed with a double piston rack and pinion rotation structure, and usually can be divided into two forms: double-acting and single-acting. Single-acting refers to the one with a spring reset function.

The actuator and regulating mechanism of AT pneumatic actuator is a unified whole, and its actuator can be divided into two types: film type and piston type. The stroke of the piston type is longer, which is suitable for the occasion with larger thrust requirements. This actuator can not only drive the valve stem directly but also can be used with a turbo worm. The stroke of the membrane type is shorter and can only drive the stem directly.

AT pneumatic actuator has two forms of positive and negative action, the positive action form is the signal pressure increases, and the push rod is down. The reverse-acting one is to increase the signal pressure and push the stem upward. The output displacement of this actuator is proportional to the input pneumatic pressure signal, the greater the signal pressure, the greater the displacement of the actuator. When the pressure is balanced with the reaction force of the spring, the pusher is stabilized in a certain position. AT pneumatic actuator also has two kinds of pneumatic actuators: angle-stroke pneumatic actuator and straight-stroke pneumatic actuator. With the continuous development of pneumatic actuator intelligence, intelligent valve positioner becomes an indispensable supporting product. The intelligent valve positioner is equipped with a highly integrated microcontroller, which adopts the principle of electric balance (digital balance) instead of the traditional force balance principle, converting the electric control command into pneumatic positioning increments to realize valve position control; using the digital open, stop and close signals to drive the action of the pneumatic actuator; the valve position feedback signal is directly passed through the highly accurate position sensor to realize the electric/gas conversion function.