Modulating Electric Actuator (4-20mA)

The Modulating Electric Actuator (4–20mA) is designed for proportional control of industrial valves in automation systems. It converts a standard 4–20mA signal from PLC or DCS systems into precise rotary motion for continuous valve positioning.
It is used in flow, pressure, temperature, and level control applications where stable and repeatable modulation is required.

4–20mA is an industrial standard analog signal widely used in process automation due to its strong anti-interference capability and stable long-distance transmission performance.
It is commonly applied in PLC and DCS-based control systems for reliable valve modulation.

• 4–20mA proportional valve position control
• Closed-loop servo positioning system
• Position accuracy up to ±1%
• Built-in anti-deadband control logic
• Real-time position feedback (4–20mA / 0–10V optional)
• Manual override for emergency operation
• Over-torque / over-temperature protection
• IP65 / IP67 / IP68 protection options
• Suitable for continuous industrial modulation duty

The actuator continuously compares the 4–20mA input signal with the internal position feedback signal.
When deviation is detected, the motor automatically adjusts until the valve position matches the target signal.
This closed-loop control ensures stable modulation with high repeatability and low deviation under continuous operation.

Water Treatment Plant
Used in flow control systems for filtration and chemical dosing. Helps maintain stable water quality and reduce pressure fluctuation in pipeline systems.

HVAC District Cooling System
Applied in chilled water loop control for commercial buildings, improving temperature stability and energy efficiency in large-scale HVAC networks.

Chemical Process Plant
Used in controlled dosing and corrosive media regulation systems under continuous operation conditions.

Proper actuator selection depends on valve torque requirements and working conditions.
Key selection factors include:

• Valve size (DN15–DN600+)
• Operating pressure
• Medium type (water, oil, gas, chemical)
• Operating frequency
• Safety and fail position requirement

We provide torque calculation and actuator selection support based on project requirements.

• Motorized Ball Valve
• Electric Butterfly Valve
• Globe Control Valve
• Industrial flow dampers
• Process regulation valves

Each actuator is tested before shipment under industrial quality control procedures:

• Torque output verification
• Electrical insulation test
• Full stroke cycle test
• IP protection sealing test
• Continuous operation endurance test

Manufacturing system is operated under ISO 9001 quality management standards.

• Ensure correct wiring of 4–20mA signal and power supply
• Match actuator torque with valve requirements
• Perform zero and span calibration before commissioning
• Conduct dry-run test before system operation
• Verify feedback signal stability during commissioning

We provides electric actuator solutions for global industrial automation markets.
Capabilities include:

• OEM / ODM customization
• Torque, voltage, and IP rating configuration
• Control logic customization for different automation systems
• Export supply for distributors and engineering contractors

Products are widely used in water treatment, HVAC, oil & gas, and chemical industries.

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