Double-acting actuator used in the DA series pneumatic actuator, for example. Gear-actuator output torque piston pressure (air pressure) multiplied by the radius of the circle (arm) means, as shown in Figure 4. And friction resistance and high efficiency. As Figure 5 shows, clockwise and counterclockwise torque is linear. Under normal operating conditions, the recommended safety factor for double-acting actuators for 25-50%