Compact Intelligent Electric Actuator

At Liangfa, we design compact electric actuators for automated valve control where installation space, positioning accuracy and reliable signal communication are important. Our Compact Intelligent Electric Actuator integrates drive, position detection and control functions into one unit, reducing the need for additional control accessories. 

It supports 4–20 mA modulation, local and remote operation, and optional Modbus RTU communication for compatible automation systems. As a high-tech enterprise, Liangfa provides product selection assistance and technical support to help customers match actuator performance with valve specifications and site conditions.

Control Accuracy and System Compatibility

For applications that require more than simple open-and-close operation, our Compact Intelligent Electric Actuator supports continuous valve-position adjustment through a 4–20 mA DC input signal, with a corresponding 4–20 mA position-feedback output. The integrated positioning system eliminates the need for a separate external valve positioner in compatible configurations, helping simplify wiring and reduce installation work.

The built-in encoder monitors valve position, while the adjustable dead band helps reduce unnecessary movement caused by small signal fluctuations. Operators can select local or remote control according to the process requirements. For projects that require centralized communication, optional Modbus RTU allows connection to compatible PLC, DCS and other supervisory control systems.

During configuration, we recommend confirming the control mode, signal-loss response and communication requirements before ordering. Depending on the application, the signal-loss setting can be configured to hold the current position, move to fully open or move to fully closed.

Specifications for Project Selection

Choosing an actuator requires checking the electrical supply, valve interface, operating torque and site environment together. The following specifications provide a starting point for selecting a suitable configuration.

The listed specifications describe the standard configuration and available options. Before production, we recommend confirming the exact mounting dimensions, output torque, stroke time, signal requirements and environmental conditions with our technical team.

Match the Actuator to the Valve

Check Operating Torque First

The Compact Intelligent Electric Actuator must provide sufficient torque to operate the connected valve under actual working conditions. Valve size alone is not enough to determine the correct actuator, because required torque can vary with valve design, seat material, differential pressure, medium and operating temperature.

As a preliminary selection reference, the original product data suggests the following torque ranges for soft-seated wafer butterfly valves:

• DN50–DN150: approximately 50–150 N·m
• DN200–DN300: approximately 200–400 N·m

These figures are reference values rather than universal sizing rules. We recommend obtaining the valve manufacturer's operating-torque data and applying an appropriate safety margin. The supplied technical guidance suggests selecting rated actuator torque at approximately 1.2–1.5 times the actual valve operating torque, subject to the valve manufacturer's recommendations and the process conditions.

Confirm the Mounting Interface

The ISO 5211 flange options include F03, F04, F05, F07 and F10. Please check both the actuator mounting flange and the valve stem or output-shaft dimensions. If the shaft dimensions do not match, a suitable adapter sleeve may be required. Correct alignment helps prevent unnecessary mechanical stress and uneven loading during operation.

Select the Correct Power Supply

AC220V is a common option for industrial installations, while DC24V may be suitable for building automation and control systems designed around low-voltage power. AC380V is available for configurations that require it. The selected supply must match the actuator nameplate and the available site power; voltage compatibility should be confirmed before wiring.

Built for Space-Limited Installations

The integrated design combines the motor, worm-gear transmission, control electronics and position detection in a compact housing. This arrangement is useful in pipe shafts, ceiling voids, pump rooms and equipment skids where a larger actuator may be difficult to install or maintain.

The housing is made from die-cast aluminum alloy with an anti-corrosion coating. Standard IP65 protection helps prevent dust ingress and withstands water jets under the conditions defined by the rating. An optional IP67 configuration can be considered for installations that require additional protection against temporary immersion, subject to the manufacturer's specified test conditions and correct cable-entry sealing.

The worm-gear mechanism provides power-off self-locking to help maintain the valve position when electrical power is interrupted. A manual operating mechanism is also available for suitable configurations, allowing operators to move the valve locally when required by the maintenance procedure.

For outdoor installation, we recommend a suitable sun and rain shield, properly sealed cable glands and downward-facing cable entries where practical. The standard enclosure is not designed for permanent underwater service. An ordinary model must also not be installed in an explosive atmosphere; the appropriate certified explosion-proof version is required for hazardous areas.

Protection and Fault Response

Unexpected valve resistance, incorrect signals or excessive motor temperature can interrupt an automated process. To help reduce equipment damage, our intelligent actuator incorporates several protective functions.

• Travel limits: Mechanical and electronic limits help control the permitted operating range.
• Over-temperature protection: Helps protect the motor when its temperature rises beyond the permitted operating range.
• Overload and stall protection: Stops operation and triggers an alarm when abnormal resistance or excessive load is detected.
• Signal-loss protection: Supports configurable responses for compatible control configurations.
• Fault diagnosis: Helps identify conditions such as overload, signal loss and abnormal valve-position feedback.
• Power-failure memory: Retains relevant position or configuration information to reduce the need for recalibration after a power interruption.

These functions support troubleshooting but cannot remove a mechanical blockage inside the valve. If an overload alarm occurs repeatedly, the valve should be inspected for jamming, excessive operating torque, incorrect sizing or mechanical wear before the actuator is returned to service.

Operating Conditions to Check Before Ordering

Temperature and Heat Transfer

The standard ambient operating range is -20°C to +60°C. If the actuator is installed near a hot valve body or high-temperature process line, an extended mounting bracket or heat-insulating arrangement may be needed to reduce heat transfer. For temperatures outside the standard range, please consult us about a suitable customized configuration rather than assuming the standard model will perform normally.

Humidity and Condensation

IP65 protection is suitable for many ordinary industrial environments, but persistent condensation can still affect internal electrical components if sealing or installation is inadequate. For humid pump rooms, basements and wastewater facilities, an optional internal heater and IP67 protection may be worth considering. Cable glands, seals and enclosure condition should also be checked during maintenance.

Dust, Vibration and Corrosion

Dust accumulation can reduce heat dissipation, so the housing should be inspected and cleaned as part of routine maintenance. Where pumps or compressors generate strong vibration, use appropriate vibration-reduction measures and check fasteners and wiring regularly. The standard aluminum-alloy housing is intended for ordinary atmospheric conditions; heavy salt fog, strong acids, alkalis or corrosive gases may require enhanced surface protection or a specially selected housing.

Operating Frequency

The Compact Intelligent Electric Actuator is intended for suitable rotary-valve modulation and on-off control, but frequent short-cycle movements can increase motor temperature and accelerate wear. If the control system continually reverses the valve in response to small changes, review the dead-band setting and control-loop tuning. The required stroke time and operating frequency should be confirmed during selection.

Installation and Commissioning Checklist

Correct installation helps preserve positioning accuracy, enclosure protection and mechanical service life. We recommend the following checks before the equipment enters normal operation.

1. Inspect the valve: Confirm that it moves smoothly through its full stroke and does not have excessive operating torque or mechanical blockage.
2. Verify compatibility: Check the actuator model, rated torque, voltage, ISO 5211 flange, shaft dimensions and control signals.
3. Mount and align: Align the actuator with the valve shaft, fit any required adapter, and tighten mounting bolts evenly.
4. Complete wiring safely: Isolate the power supply before wiring. Follow the supplied wiring diagram, grounding instructions and cable-sealing requirements.
5. Calibrate travel: Set the fully closed and fully open positions according to the product instructions, then configure the control direction and dead band.
6. Test control signals: Check local operation, remote 4–20 mA response, position feedback, limit protection and the configured signal-loss response.
7. Run trial cycles: Perform several complete operating cycles and verify smooth movement, correct stopping positions and the absence of abnormal alarms.

For routine maintenance, inspect the enclosure, cable glands, mounting bolts, wiring, manual operating mechanism and signs of unusual heat or noise. If position feedback becomes unstable or overload alarms recur, check the control signal and valve condition before changing actuator parameters.

Liangfa Manufacturing and Quality Support

At Liangfa, we support customers from model selection through production, inspection, export packing and after-sales technical assistance. As a high-tech enterprise, we focus on practical product engineering and configuration matching for industrial automation projects.

Before shipment, our stated service process includes factory inspection and the provision of applicable inspection reports and material test certificates. Available export documentation can include commercial invoices, packing lists, bills of lading and relevant product test documents, as applicable to the order.

We can assist with technical drawings, specification confirmation, sample evaluation and configuration discussions. Our after-sales support includes remote installation guidance, maintenance advice and spare-parts assistance. The stated warranty period is 12 months from the date of shipment, subject to the applicable order terms.

Factory Tour

Our manufacturing and assembly process supports the production of electric actuators for different valve automation requirements. Contact us if you need additional product drawings or configuration details for your project.

Packaging and Global Delivery

We arrange export packaging and shipment according to the order requirements, with sea and land transportation options available. Packaging, shipping arrangements and required export documents can be confirmed before dispatch.

Applications in Valve Automation

The Compact Intelligent Electric Actuator is intended for compatible 90° rotary valves and air dampers. Its compact construction and proportional control functions make it suitable for projects that require automated flow adjustment without installing a large actuator assembly.

Water Supply and Pumping Systems

In municipal water supply, secondary water supply and industrial water networks, the actuator can support valve-position control for compatible flow and pressure regulation applications. Confirm the valve torque and required control response for each installation.

Wastewater and Reclaimed Water

For wastewater treatment plants, reclaimed-water stations and pumping facilities, the actuator can be used for compatible process valves and dampers. Optional Modbus RTU communication can support centralized monitoring when integrated with a compatible control system.

HVAC and Building Management

In commercial buildings, hospitals, offices and other facilities, the compact housing can help with installation in ceiling spaces and pipe shafts. Compatible DC24V configurations and 4–20 mA modulation can be used in building automation systems designed for those interfaces.

Environmental Control and Ventilation

The actuator can drive compatible ventilation and dust-collection dampers to regulate air volume. For hot flue-gas applications, the installation must account for heat transfer and keep the actuator within its specified ambient temperature range.

Light Industry and General Process Lines

For suitable pharmaceutical, food-processing and general industrial systems, the actuator can provide proportional control when the medium, valve materials and environmental conditions are compatible with the selected equipment. Standard models must not be used in explosive atmospheres.

Industrial Water Treatment

Cooling-water circulation, pure-water systems and water-softening equipment can use compatible rotary valves for automated flow adjustment. Selection should consider valve operating torque, the required modulation frequency and the available control-system interface.

Technical Service and Order Support

Before Ordering

We help customers review valve specifications, operating conditions, power supply, control signals and mounting dimensions. Product drawings, technical data and quotation support can be provided for model confirmation. Sample arrangements and customization requests can be discussed according to project requirements.

During Production and Shipment

We coordinate production progress, applicable factory inspection documents, export packaging and shipping information. The required documentation and transport arrangements are confirmed according to the order.

After Delivery

Our support includes remote installation guidance, operating and maintenance advice, spare-parts assistance and technical consultation for valve replacement or pipeline upgrades. The stated response time for quality feedback is within 24 working hours.

Frequently Asked Questions

Can this actuator work with my existing PLC or DCS?

It supports 4–20 mA DC control input and 4–20 mA position feedback. Optional Modbus RTU is available for compatible systems. Please confirm the controller's signal type, wiring arrangement and communication requirements before ordering.

Do I need to purchase a separate valve positioner?

The integrated intelligent positioning system supports 4–20 mA modulation without an external positioner in compatible configurations. Confirm the selected model and control functions against your project requirements.

Can I install the standard model in an explosive area?

No. The standard model is not suitable for explosive atmospheres. A correctly certified explosion-proof actuator must be selected for the specific hazardous-area classification and installation requirements.

Is IP67 protection suitable for continuous underwater operation?

IP67 does not mean the actuator is suitable for permanent submersion. For long-term underwater service, a specifically designed and confirmed IP68 version is required.

What should I check if the actuator repeatedly reports an overload?

Check whether the valve is blocked, the operating torque exceeds the selected actuator rating, or the mechanical connection is misaligned. Also review the valve's condition and the actuator's configuration. Do not repeatedly force a jammed valve; isolate the equipment and investigate the cause before restarting.

What information should I send for model selection?

Please provide the valve type and size, required operating torque if available, mounting flange and shaft dimensions, power supply, control signal, required stroke time and site conditions. Also identify whether the application involves high humidity, corrosive media, outdoor exposure or a hazardous area. These details help us recommend a suitable configuration.

What is the warranty period?

The stated warranty period is 12 months from the date of shipment, subject to the terms agreed for the order. Please contact our team with the product model and order information if you need warranty or spare-parts assistance.