Rack and Pinion Electro-Hydraulic Actuators

Product Details

Rack and pinion electro-hydraulic actuators often offer an economical solution for quarter turn valves with a constant torque requirement throughout the stroke.

Product Highlights

The ATI R.E.S. (Rotary Electro-Hydraulic System) Rack and Pinion series delivers a robust, reliable design with easy installation and low maintenance requirements. Designed for a wide range of torques, this product provides both reliability and a lower cost than an equivalent electric actuator. The R.E.S. consists of either single-acting, spring return fail safe operation or double-acting, fail in place operation actuators, mounted 100% duty cycle electric motor, motor starter, hydraulic pump, reservoir, directional control valve, and electrical controls. In the event of a power loss, the valve will automatically go to the fail position by means of the springs in the actuator or remain in place.

ATI’s R.E.S. utilizes hydraulic power to operate a Rack & Pinion valve actuator. Along with a wide range of system sizes, each actuator permits variable torque by means of an adjustable relief valve. In order to maintain the self contained system and allow for the minimal maintenance time of 5 years, an oil filter/screen is included in the return line at the tank to enhance the life of the system. The unit can be 24VDC, 120VAC, 240VAC, or 480VAC powered. Local, remote, and manual operation are standard. The control system is designed for hazardous areas up to Class 1 Division 1 with certified electrical components.

  • Explosion Proof: Motors, Limit Switches,Solenoid Valves, Electrical Enclosures
  • Input Power: 24VDC, 120VAC, 240VAC, 480VAC single and three phase voltages
  • Failure Modes: Spring Return, Fail-inPlace, and ESD
  • Remote/Local Control/Modulation
  • Visual position indicators
  • Optional Low Temperature to -40 °F
  • Optional Advanced Communication (HART, Profibus, etc.)
  • Optional 24 VDC control and supply voltage available
  • Optional 4-20mA Modulating Control and Feedback

Common Applications

  • Well suited for applications requiring critical control and reliability.
  • Oil and gas depots where explosion-proof equipment is required and where compressed air is not available.
  • Power industry, district heating plants, water service, mining, food service.
  • Emergency shutdown scenarios where safety is of utmost importance.
  • Retrofitting valve solutions, this system offers a viable alternative to manual valves.
  • Where industrial power supplies are readily available but where air or oil compressor units and relevant distribution infrastructure would create intrusive designs or capital cost barriers.
  • On small and medium valves in remote locations.
  • Fast closing times.
  • Rugged, Heavy Duty, and Severe Service.

Product Advantages

  • Reduced installation and maintenance costs.
  • Designed for safety critical applications.
  • Provides local operator information.
  • Reliable means of positioning a valve in a fail-safe position on loss of power or signal.
  • The system is customized for direct mounting on any valve.
  • Ensures valve availability and minimizes plant shutdown.
  • Improved process control and product quality through fast closing/opening times, remote capabilities, and precise valve movement.
  • Complete sealing allows calibration and installation of the actuator in all environments.
  • Environmental protection maintained for internal components during installation, commissioning, and operation.
  • Interfaces with a variety of communication networks.
  • Suitable for harsh environments including outdoor and hazardous locations.


ATI Rack and Pinion Electro-Hydraulic Actuators are used in the following industries. Click below to learn more.

Oil & Gas | Power | Chemical | Mining | Pulp & Paper | Water

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