An electric actuator uses AC or DC electrical power to drive a motor that positions a valve or damper, offering precise control and integration with digital building management systems. These actuators convert electrical signals (24V, 120V, or 240V) into controlled linear motion, enabling two-position or modulating valve operation. They dominate residential and modern commercial HVAC applications due to simple wiring and control flexibility.
Technical Details
Electric actuators contain a reversible motor coupled to a gear reduction mechanism that moves a valve stem over 90-180 second cycles. Most models accept 0-10V proportional signals for modulating control or simple on-off commands. Typical operating voltage is 24V AC in residential systems and 120V AC in commercial installations. Position feedback is available through potentiometers or rotary encoders.
Applications
Electric actuators control multi-zone heating valves, radiant heating systems, and three-way diverting valves. They operate supply air dampers, return air dampers, and zone boxes in VAV systems. Integration with thermostats and building automation platforms enables sophisticated scheduling and occupancy-based control.
Practical Significance
Electric actuators provide accurate position feedback, allowing systems to verify valve operation and diagnose failures. Lower installation complexity and reduced air compressor requirements decrease capital and operational costs.