When the air source pressure enters the middle chamber between the two pistons of the cylinder from the air inlet, the two pistons separate and move toward both ends of the cylinder. The air in the cavities at both ends is discharged through the air holes, and the two piston racks synchronously drive the output shaft (gear) to rotate counterclockwise. On the contrary, when the air source pressure enters the air cavity at both ends of the cylinder from the air port, the two pistons move to the middle of the cylinder, and the air in the middle air cavity is discharged through the air port. At the same time, the two piston racks synchronously drive the output shaft to rotate clockwise.
