OpRPA™ High Performance Rack & Pinion Actuator

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The Trimteck OpRPA High Performance Rack & Pinion Actuator has been designed for automating V-Notch Ball, Trunnion Ball, Eccentric Plug, Butterfly, Custom-Engineered Rotary Valves, and Dampers. Contrary to the long-held view that rack and pinion actuators do not provide sufficient resolution to accurately position a plug or ball in a control valve, there have been significant advancements in the design and manufacturing process of some rack and pinion actuators so that they now provide precise control and high resolution – all at a reduced cost when compared to piston-cylinder or diaphragm rotary actuators.

The OpRPA is enclosed in a precision-extruded anodized aluminum body and has a one-piece nitride-coated pinion gear. They are designed for 100-degree travel with clockwise and counterclockwise travel adjustment for open and closed positions. Moreover, the OpRPA is convertible to a double acting or a spring return simply by removing or adding springs.

  • Internal/External Corrosion Protection
  • Honed Cylinder Surfaces for Low Coefficient of Friction
  • High Cycle-Life
  • Field Reversible
  • EDM Machined Racks and Gear for Low Backlash and High Efficiency/Precise Control
Actuator Type

Actuator Materials

Base Valve Type

V-Notch Ball, Eccentric Plug, Trunnion Ball, Butterfly, Custom-Engineered/Specialty

Air Supply (PSI)

Double Acting 29 to 116, Max Allowable 145, Spring Return 29 to 116

Operating Temperature (F)

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Torque Range

Travel Adjustment

Failure Position

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Actuator Options


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