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The function of the actuator in hydraulic control systems is to convert the hydraulic energy supplied by the pump and processed by the control elements into useful work. Actuators have either a linear or rotary output and can be classified into three basic types:

  1. (1)

    Cylinders or jacks.

  2. (2)


  3. (3)

    Rotary actuators.

Rotary actuators, which are essentially non-continuous motors, consist of a cylindrical body to which one or two vanes are rigidly attached. The output shaft carries a moving vane or, in the case of a double-vane actuator, two vanes, the torque output of a double-vane actuator being twice that of a single-vane unit. Maximum angle of rotation is limited to approximately 150° for double-vane and 300° for single-vane actuators. This type of actuator is particularly suitable for applications requiring accurate position control at high output torque, as it obviates the need for reduction gearing, which can introduce elasticity and backlash, thereby adversely affecting system performance.

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© 2000 Springer Science+Business Media Dordrecht

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Walters, R.B. (2000). Hydraulic Actuators. In: Hydraulic and Electric-Hydraulic Control Systems. Springer, Dordrecht.

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  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-015-9429-5

  • Online ISBN: 978-94-015-9427-1

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