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In industrial automation, electric actuators play a critical role in valve control by converting electrical energy into precise mechanical motion. Whether you're managing a complex processing system or streamlining a pipeline operation, selecting the appropriate electric actuator ensures efficient, reliable, and cost-effective performance. This guide outlines the essential considerations when choosing an electric actuator and compares two major types: Multi-Turn Electric Actuators and Linear Output Electric Actuators.
Electric actuators automate valve movement without relying on compressed air or hydraulic fluid. Their advantages include:
High positioning accuracy
Compatibility with digital control systems
Lower maintenance compared to pneumatic and hydraulic systems
To select the ideal actuator, it’s vital to understand the unique needs of your application and how actuator types align with valve mechanisms.
The actuator type depends on the valve’s motion requirements:
Rotary motion: Suitable for ball, butterfly, and plug valves
Linear motion: Suitable for globe, gate, and diaphragm valves
Determine the torque (for rotary valves) or thrust (for linear valves) necessary to operate the valve. Undersized actuators risk failure or inefficient operation.
Actuators must withstand site conditions such as:
Temperature extremes
Moisture or humidity
Dust, chemicals, or explosive atmospheres (requiring ATEX or IP-rated enclosures)
Choose actuators with features that match your control system, such as:
Position feedback (via potentiometers or encoders)
On/off or modulating control
Communication protocols (Modbus, Profibus, etc.)
Ensure the actuator supports your facility's voltage (e.g., 24VDC, 110VAC, 230VAC) and phase type (single or three-phase).
Designed to provide multiple rotations, multi-turn actuators are used for valves requiring several revolutions to fully open or close.
Gate valves: Commonly used for on/off service in pipelines
Globe valves: Often used for throttling and flow regulation
High torque capability for large valves
Fine position control for regulating flow
Built for rugged industrial use
Larger and heavier, may require more space
More complex internal mechanisms, increasing maintenance needs
These actuators deliver direct linear motion, ideal for applications requiring straight-line valve stem movement.
Globe valves: Accurate flow control
Diaphragm valves: Preferred in hygienic industries like food and pharmaceuticals
Gate valves (in specific configurations)
Direct linear movement improves control accuracy
Compact design suits limited-space installations
Mechanically simple, reducing wear and service needs
Only suitable for linear-motion valves
Lower force output than high-torque multi-turn actuators
| Feature | Multi-Turn Actuator | Linear Output Actuator |
|---|---|---|
| Motion Type | Rotational (multiple turns) | Linear |
| Typical Valve Types | Gate, Globe | Globe, Diaphragm, some Gate |
| Torque/Thrust Output | High torque | Moderate linear thrust |
| Space Requirement | Larger | More compact |
| Mechanical Complexity | Higher | Lower |
| Maintenance Needs | Moderate to High | Low |
Define Application Requirements
Identify valve type, system demands, and operation goals (on/off vs modulating).
Match Actuator Type to Valve Motion
Use multi-turn actuators for rotary movement and linear actuators for straight-line motion.
Evaluate Environmental Conditions
Choose actuators rated for specific temperature ranges, ingress protection (IP), and hazardous area certifications if needed.
Review Power Supply and Control Needs
Verify voltage compatibility and communication requirements with your automation system.
Account for Installation Constraints
Consider physical space, weight limits, and accessibility for installation and maintenance.
Prioritize Reliability and Service Life
Choose actuators from trusted manufacturers and assess service support availability and spare parts.
Selecting the right electric actuator is key to the smooth, reliable operation of your control valves and broader automation system. Understanding the differences between multi-turn and linear output actuators—along with considering environmental, mechanical, and electrical factors—ensures you choose a solution that meets both current and future operational needs. Proper installation and routine maintenance will further extend actuator life and optimize performance across your facility.Know more about Google SEO Directory
