As a core execution component, electric valve actuators are critical in automated control systems and valve operation. They can work with various control modules to achieve seamless switching between manual and automatic modes, enabling precise flow regulation. These actuators are widely applied in industries such as petrochemicals, power generation, and water treatment systems, offering significant value for process automation.
There are three primary control methods:
1.Analog control: Accepts and outputs a 4–20 mA current signal for continuous regulation.
2.On/off control: Includes both active and passive switch types for basic open/close operations.
3.Protocol-based control: Uses digital communication protocols (e.g., Modbus, Profibus) for smart system integration.
Main functions:
4.Torque protection: Prevents the actuator from exceeding its rated torque during operation, safeguarding both the valve and the actuator from damage.
5.Limit protection: Automatically stops the actuator when it reaches the fully open or fully closed positions to prevent over-travel.
6.Automatic phase sequence adjustment: Detects the phase sequence of the connected three-phase power supply and adjusts the motor direction accordingly. This eliminates the need for precise phase wiring and prevents valve damage from incorrect phase connections.
7.Instantaneous reversal protection: Introduces a short time delay when receiving a reverse command to reduce wear on the valve stem and gearbox.
8.Phase loss protection: Monitors voltage and current to detect phase loss when the motor is stationary or running, preventing motor overheating and damage by stopping operation.
