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Technical Characteristics of Four-Wire Thermal Actuators
Core Definition & Working Principle
A four-wire thermal actuator is an electrothermal device that regulates fluid flow by converting thermal expansion into mechanical motion. It operates through a thermal-responsive element (e.g., paraffin wax or bimetallic strip) that expands/contracts with temperature changes, driving a valve or damper to adjust flow rates. Unlike pneumatic or hydraulic actuators, it relies solely on electrical heating for actuation, eliminating the need for compressed air or fluid pressure sources.
