High Performance 24VDC Electric Rotary Actuator EH Series

Applications of the AMOT EH Series Electric Rotary Actuator

The AMOT EH Series electric rotary actuator is designed for quarter-turn valve control in environments where standard industrial actuators do not survive. Its application range is defined less by a single industry and more by a specific operating profile: high vibration, wide temperature swings, continuous duty, and integration with modern electronic control systems. As a result, the EH Series is applied across engine-mounted systems, mobile equipment, marine platforms, energy infrastructure, and emerging low-carbon technologies.

This section outlines where and how the EH Series is typically used, and what design conditions make it an appropriate choice.

On-Engine and Prime Mover Applications

A primary application class for the EH Series is direct mounting on internal combustion engines and prime movers. These environments impose continuous vibration across a broad frequency range, frequent thermal cycling, and exposure to fluids, dust, and washdown procedures.

Typical on-engine uses include actuation of quarter-turn valves associated with air, exhaust, and coolant flow. Examples include exhaust gas recirculation valves, intake air control valves, bypass valves, and coolant routing valves used in engine thermal management systems.

The EH Series is suited to these applications due to its rated vibration resistance of 14.1 GRMS from 10 to 1000 Hz, mechanical shock resistance to 40G, and continuous duty cycle at rated load. Operation down to -40°C supports cold start conditions, while high maximum ambient temperature ratings allow installation close to heat sources such as exhaust manifolds or turbocharger assemblies.

Both the EH125 and EHC25 models are used in this category. The higher torque EH125 is typically selected where valve breakaway torque is significant, while the compact EHC25 is used where space constraints are critical, such as densely packaged engine bays or skid-mounted systems.

Diesel Engine Air and Exhaust Control

In diesel engine systems, precise control of air and exhaust flow is required to support emissions compliance, transient response, and safe operation. Electric rotary actuators are commonly used to position valves associated with exhaust gas recirculation, intake throttling, and exhaust bypass functions.

The EH Series supports these applications through configurable control interfaces including 4–20 mA, 0–10 V, PWM, and SAE J1939 CAN. These interfaces allow the actuator to be driven directly by an engine control unit (ECU) and to provide position feedback using a non-contact Hall effect sensor.

Where used on exhaust-related valves, the actuator’s torque capability and continuous duty rating help maintain valve positioning even when deposits, temperature variation, or pressure differentials increase operating load. Programmable stroke times allow designers to balance response speed with system stability, depending on whether rapid repositioning or gradual modulation is required.

Air Intake Shutoff and Safety Functions

Air intake shutoff systems are used in diesel engines to stop airflow in emergency conditions. These systems are commonly applied in industrial facilities, mining operations, marine vessels, and oil and gas installations where uncontrolled engine operation presents safety risk.

In these applications, the EH Series is used to drive quarter-turn shutoff valves that must close reliably on command. Electric actuation allows remote operation and integration into safety logic without reliance on pneumatic supply pressure.

Manual override capability, included as standard, allows mechanical operation if electrical power is unavailable. This feature is particularly relevant in safety-related installations where redundancy and serviceability are required.

Marine and Naval Systems

Marine environments introduce additional challenges including salt exposure, humidity, washdown, and mechanical shock from vessel motion or impact events. The EH Series is applied in both commercial and naval marine systems where electrically actuated valves are required to function reliably in these conditions.

Typical marine applications include seawater cooling circuits, fire main isolation valves, ballast systems, and HVAC flow control. IP67 and IP69K enclosure ratings allow the actuator to withstand immersion and high-pressure washdown, while corrosion-resistant materials and coatings support long-term use in marine atmospheres.

In naval or defense-related platforms, shock resistance and the ability to operate after mechanical events are key design considerations. The EH Series is used where electrically actuated isolation or control valves must remain functional under these conditions.

Locomotive and Rail Applications

Rail applications involve sustained vibration, mechanical shock during coupling, wide ambient temperature ranges, and limited access for maintenance. Electric rotary actuators in this environment are commonly used for engine support systems, cooling circuits, and emissions-related valve control.

The EH Series supports rail applications through its mechanical durability, 24 VDC power compatibility, and ability to mount in any orientation. CAN-based communication is compatible with vehicle control architectures used in locomotives and rail power units.

Compact variants are often selected where space and weight constraints exist, while higher torque models are used where valve loads are higher/ due to system pressure or fluid characteristics.

Oil and Gas Equipment

In oil and gas applications, the EH Series is used on equipment where electric actuation is preferred over pneumatic systems. This includes compressor packages, generator sets, and auxiliary systems where eliminating pneumatic infrastructure simplifies installation and reduces maintenance.

Typical uses include actuation of process isolation valves, bypass valves, and control valves associated with fuel gas, air, or cooling systems. The actuator’s wide temperature range supports outdoor installations, while its sealed enclosure protects against dust, moisture, and washdown.

The EH Series is commonly applied in non-incendive or safe area installations, or where system-level measures address hazardous area requirements. Selection for hazardous locations should always be verified against site classification and applicable standards.

Power Generation Systems

In power generation equipment, including reciprocating engine generators and auxiliary turbine systems, electrically actuated quarter-turn valves are used for coolant control, lube oil routing, air handling, and bypass functions.

The EH Series is suited to these applications due to its continuous duty rating and ability to provide precise, repeatable positioning. Integration with plant or engine control systems allows valve position to be adjusted dynamically based on operating conditions, rather than relying on fixed mechanical devices.

Where generators are deployed in remote or mobile installations, 24 VDC operation simplifies power distribution and allows compatibility with battery-backed systems.

Mining and Heavy Equipment

Mining and off-highway equipment operate in some of the most demanding mechanical environments. Actuators are exposed to vibration, dust, temperature extremes, and aggressive cleaning practices.

The EH Series is applied in these environments for engine support systems, intake and exhaust control, and process-related valve actuation on mobile machinery. IP69K protection supports frequent pressure washing, while vibration resistance reduces the risk of fatigue-related failures.

Compact form factors and standardized ISO mounting interfaces support integration into OEM equipment designs.

Hydrogen and Fuel Cell Balance of Plant

In hydrogen fuel cell systems, electrically actuated quarter-turn valves are used within balance-of-plant subsystems to manage air flow, exhaust routing, and auxiliary fluid circuits. These applications require precise control, fast response, and reliable operation over long duty cycles.

The EH Series is applied in low-pressure air and auxiliary flow control roles where its electric drive, compact size, and communication options support integration with fuel cell control systems. Brushless motor design and non-contact position sensing support high cycle life in applications involving frequent modulation.

Use in hydrogen-related systems should always consider applicable safety standards and system-level design requirements.

Process Control and Industrial Valve Automation

Beyond engine-centric systems, the EH Series is used for general industrial quarter-turn valve automation where environmental conditions exceed those typically tolerated by standard actuators. This includes outdoor installations, mobile skids, and washdown areas.

The actuator’s configurable inputs and outputs allow it to interface with a wide range of control systems, from simple analog loops to networked control architectures Software-configurable limit functions reduce the need for mechanical adjustment during commissioning.

Summary of Application Fit

The EH Series is not a general-purpose plant actuator. It is intended for applications where mechanical durability, environmental resistance, and electronic integration are equally important. Engineers typically select this actuator when valve control must remain reliable under vibration, temperature extremes, and continuous operation, and when integration with modern control systems is required.