Views: 0 Author: Site Editor Publish Time: 2026-07-20 Origin: Site
An electric actuator is the core device behind modern industrial valve automation. This guide explains how it works, compares the five main types, and shows you how to select the right model for your project.
Table of Contents
What Is an Electric Actuator and How Does It Work?
Main Types of Electric Actuators
Electric Actuator Types Comparison Table
How to Choose the Right Electric Actuator
Typical Industry Applications
Why Choose KONTE Electric Actuators
FAQ
Core Keyword: Electric Actuator，On/Off Electric Actuator，Modulating Electric Actuator，Intelligent Electric Actuator，Multi-turn Electric Actuator，Explosion-proof Electric Actuator
An electric actuator converts electrical energy into rotary or linear motion to open, close, or regulate valves. It is the standard solution for ball valve and butterfly valve automation in water, oil, gas, and chemical pipelines.
The working principle is straightforward: the motor drives a worm gear transmission, which converts high-speed rotation into low-speed, high-torque output. The output shaft then rotates the valve stem through a defined angle, typically 0–90°.
Two safety designs matter most. Electronic and mechanical dual limit devices prevent overtravel, while the self-locking worm gear holds the valve position securely during power failure.
An on/off electric actuator performs simple open and close operations using a switching signal. It is the most cost-effective choice for pipelines that only require full-open or full-close control, such as isolation valves in water distribution.
A modulating electric actuator accepts a 4–20mA current or 0–10VDC voltage signal and positions the valve at any angle between 0° and 90°. It is essential for processes that demand precise flow, pressure, or temperature regulation. The Compact Electric Actuator supports both control modes with IP67 protection.
An intelligent electric actuator integrates a digital control module for self-diagnosis, digital tuning, and non-invasive commissioning. It reduces setup time and enables remote monitoring in automated production lines. KONTE's Smart Type Electric Actuator complies with JB/T 8219-2016 and offers factory-preset travel times from 9s to 100s. See the full Smart-Type series for specifications.
A multi-turn electric actuator rotates the valve stem through multiple revolutions, making it suitable for gate valves and globe valves that require linear stem travel. Choose multi-turn models when quarter-turn output cannot fully stroke the valve.
An explosion-proof electric actuator uses a flameproof (Exd) enclosure to contain internal ignition, certified to Exd IIC T5 Gb per IEC 60079 standards. It is mandatory in hazardous areas where flammable gases may be present, such as refineries and offshore platforms. The KST-Ex05 Intelligent Explosion-Proof Electric Actuator delivers 50–1000 N·m torque, while the Premium Explosion-Proof Electric Actuator adds optional IP68 protection.
| Type | Control Signal | Typical Valves | Typical Application |
On/Off | Switching signal | Ball, butterfly | Water treatment system |
Modulating | 4–20mA / 0–10VDC | Control, butterfly | Chemical dosing, HVAC |
Intelligent | Digital + analog | Ball, butterfly, plug | Automated production lines |
Multi-turn | Switching / analog | Gate, globe | Power plants, pipelines |
Explosion-proof | Switching / 4–20mA | Ball, butterfly, plug | Oil & gas pipeline |
Match the actuator torque to the valve's maximum operating torque with a 20–30% safety margin. KONTE electric actuators cover 50–1000 N·m with 90° ±1° accuracy, and 270° rotation is optional.
Confirm your site voltage first: AC220V, AC380V, DC24V, or DC220V. Selecting an actuator compatible with your existing control system eliminates costly signal converters.
Standard IP67 handles outdoor installation; IP68 suits flood-prone areas. For hazardous zones, an explosion-proof electric actuator with Exd IIC certification is required. Always verify the ambient temperature range (-25°C to +60°C) against site conditions.
On/off duty is rated S2-15 min, while modulating duty requires S4-50%. A service life above 20,000 cycles (per JB/T 8862-2014) ensures low total cost of ownership.
Electric actuators support industrial valve automation across critical sectors. In a water treatment system, they automate butterfly valves for intake and dosing control. Along an oil & gas pipeline, explosion-proof models regulate flow in hazardous zones. The chemical and petrochemical industry relies on modulating actuators for precise, corrosion-resistant process control. Explore KONTE's industry solutions for detailed application cases.
KONTE is backed by over 30 years of manufacturing expertise from Kangsaite Automation Group (KST), with products exported to more than 60 countries. All actuators are certified to ISO9001, CE, ATEX, and SIL standards, with 100% inspection before shipment. OEM/ODM services cover custom voltage, torque, travel time, and private labeling. Learn more on our company profile.
Q1: What is the difference between an on/off and a modulating electric actuator?
An on/off type only opens or closes the valve fully, while a modulating type positions the valve at any angle using a 4–20mA or 0–10VDC signal.
Q2: Can electric actuators be used in hazardous areas?
Yes. Choose an explosion-proof electric actuator rated Exd IIC T5 Gb, such as the KST-Ex05, for environments with flammable gases.
Q3: What torque range do KONTE electric actuators cover?
Standard models cover 50–1000 N·m. Custom torque configurations are available for special projects.
Q4: What control signals are supported?
Switching signals, 4–20mA current signals, and 0–10VDC voltage signals, with optional optical isolation.
Q5: Can the actuator be installed at any angle?
Yes. KONTE actuators support 360° installation at any angle and require no lubrication or regular inspection.
Q6: Do you offer OEM/ODM customization?
Yes. KONTE provides custom voltage, control logic, branding, and packaging for bulk orders.
