Automation Technology, Inc. (ATI)

- Model EH-44B Series - Electro Hydraulic Actuators

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Every actuator needs power: air or hydraulic fluid pressure, electrical, solar, etc. With ATI's products, you will never be restricted by your available power source. We accommodate all power sources. Series EH-44 Electro-Hydraulic Actuator Control System

Every actuator needs power: air or hydraulic fluid pressure, electrical, or solar. With ATI’s products, you will never be restricted by your available power source. We accommodate them all.

The ATI Electro-Hydraulic Control System is designed to be a 50-5,000 psig hydraulic power and control source to drive either linear, quarter-turn or multi-turn hydraulic valve actuators.

Our self-contained unit is housed in a standard NEMA 4 epoxy painted carbon steel enclosure. It includes a 100% duty cycle electric motor, motor starter, hydraulic pump and reservoir, directional control valves and electrical controls. The system permits variable torque or thrust by means of an adjustable pressure switch as well as variable actuator speed by means of flow control valves. Modulating service with a 4-20 control input signal is available. Smaller, lighter weight and less expensive actuators can now operate larger valves because of the increased pressure available (Torque or Thrust is equal to the area of the actuator times the pressure available to do the work). The 100% duty cycle motor runs only when the system pressure drops below the pressure switch set point. Also, for larger Electro-Hydraulic Controls Systems or for Systems operating in a high level of hazardous area, a skid is available to mount the hazardous area power unit on with electrical controls placed in an enclosure beside the power unit.

The failure mode is achieved by using a spring-return actuator or by a hydraulic accumulator system with a double-acting actuator. A reservoir float/level switch or pressure sensor can be used as safety devices to shut the system down if there is a leak or line rupture. Also, a 10-micron return oil filtration system with gauge protects and enhances the life of the system. The system can be designed to operate single or multiple actuators and is suitable for small or large volumetric displacement actuators. The unit can be AC-powered, DC-powered or solar-powered. Controls for both local operator control and remote Digital Control System (DCS) operation are standard with selector switches. The control systems can be designed for hazardous areas up to Class 1 Division 1/Zone 1 or Zone 1 with FM, UL, ATEX, or IEC system certification approvals as required.

This power system seamlessly integrates with ATI’s proprietary control system to provide a precise electro-hydraulic actuator for control valve applications.

  • Drives linear, quarter-turn or multi-turn valve actuators
  • Self-contained
  • Smaller, lighter and less expensive for operating larger valves
  • Can be powered by AC, DC or solar
  • Can be provided in spring-return or double-acting configurations
  • Can be designed up to Class 1 Division 1/Zone 1 or Zone 1 hazardous areas

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