The diagrams show the torque of a Scotch-Yoke actuator (green line) and a rack and pinion actuator (red line) with equal levelsof compressed air consumption. The initial torque and final torque of the Scotch-Yoke actuator and the torque curve adapted to the curve shape of a valve (blue line) are clearly visible. For the single-action actuators, the lever arm also affects the torque of the spring return, which is increased again near the final position. The Scotch-Yoke principle thus guarantees increased safety. Since the torque curve of the valves resembles that of other fittings (e.g. ball valve), the Garlock actuator is a good choice for those fittings as well.
