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Rotary Actuators & Distributors

Bespoke design and manufacture of Rotary Actuators and Rotary Distributors to meet the exacting requirements of all industrial applications.

Rotary Actuators

Hystat will design any size of Semi-Rotary Actuator to meet your exact requirements in terms of torque, pressure and rotation.

The design is based on a machined rack and pinion configuration within a central housing, cylinders are mounted to both sides of the housing providing the motive power. For large torques a double rack would be incorporated. For low torques the cylinders can be integral in the housing.


From 100 Nm to 600,000 Nm


Any angle of rotation can be supplied but it is not normally practical to exceed 360°.


Our normal design pressure would be 160 Barg. This provides for a good torque / size ratio, but still allows for high factors of safety on gear tooth loading. Design for higher or lower operation pressures can be supplied on request.

Drive Interface

The most standard would be a male shaft, with either a machined key way, or plain for use with a torque coupling such as a ring feeder. Hollow shafts with internal key ways are also available.

The following can be incorporated into the design:

  • Adjustable Cushioning
  • End Stops
  • Position Indicators
  • Load Control Valving
Rotary Actuators

Rotary Distributors

Hystat will design and manufacture any requirement for special Rotary Distributors.

  • Channels: 2 to 16 way or above
  • Flow Rates: up to 450 Litres per minute
  • Pressure: Up to 400 Bar
  • Fluids: Mineral Oil, Grease, Phosphate Ester, Compressed Air, Argon etc
  • Speed: From 1 RPM to 1,000 RPM


  • For use with Steel Works Rotary Mandrel Cylinder
  • For the hydraulic supply for mobile equipment with a slew function such as cranes or 360° machines.
  • Any special machine requiring fluid supply but with a rotating function.


Choice of material and design would depend on each individual application. The following criteria would be considered:

  • Flow required
  • Rotation speed
  • Operating medium
  • Positive seals or clearance
  • Common or individual drain chambers
  • Roller or plain bearings
  • Plating or surface treatment to Rotor and Stator
Rotary Distributors
Quality Assurance at Hystat