AW/AWS series pneumatic actuator is one kind of scotch-yoke heavy duty actuators. Its output torque, from 0° to 90° (or vice-versa) shows U-shaped. This characteristics is particularly suited for automation of ball valves and butterfly valves. AW/AWS series, available in double acting (AW series) and spring return (AWS series), are compact with two separated cylinders and two pistons. Based on this design, it is easy to make actuators with huge size cylinders, thereby output large torque. So, it is very suitable for automating of heavy calibre part-turn valves or other part-turn mechanisms which required large torque. The inner wall of cylinders and piston rod are both coated with hard chromium that is good in anti-friction. The actuator adopting oil-free lubricated bearings and guide rings between all the moving parts, which could reduce the friction during movement and lengthen the life of actuator.
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