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Rotary actuators produce oscillating power by rotating an output shaft through a fixed arc. They are compact, simple, and efficient. They produce high instantaneous torque in either direction and require only a small space and simple mountings.
Rack-and-pinion actuators use fluid pressure to drive a piston connected to a gear rack, which rotates a pinion. Standard units are available with rotation of 90, 180, or 360deg. They can be obtained with two parallel piston-rack units to double output torque. Outputs in the millions of lb-in. are available.
Vane actuators consist of a shaft mounted in a cylindrical housing,...