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Zone Valve Actuators | STA-24M Electro-Thermic Zone Valve Actuator, 24Vac/dc, Micro Switch

Electro-Thermic Zone Valve Actuator, 24Vac/dc, Micro Switch

Datasheet (112kB)

STA actuators can be used for On/Off or PWM (2-wire) control systems in heating, air-conditioning and ventilation systems and for distribution manifolds for individual room temperature control of radiant heating & cooling systems. STA actuators are designed to operate on normally open zone valves and on distribution manifolds.

Thanks to the innovative adaptive feature, this actuator is almost universal and suitable to the majority of zone valves and manifolds in the market. The integrated auxiliary switch allows direct or indirect (with relay) operation of a pump or a fan control unit.


  • Universal Valve Adaptive concept without adapters
  • Protection from condensation and from leaking regardless of the valve position (throughout 360°)
  • Function Indicator Pin visible from any direction
  • Fast installation thanks to our Manual Override Position
  • Maintenance Free


  • Fan Coil Units
  • Zone and Terminal Unit Control
  • PICV (pressure independent) Control

Valve Compatibility Table:-

The table illustrates the STA actuator range valve compatibility options.


STA-24, STA-230

VSX 2-Port FCU Valves; DN15-DN20
VMX 3-Port FCU Valves; DN15-DN20
VTX 4-Port FCU Valves; DN15-DN20
VSX..PB PICV Pressure Independent Control Valves; DN15 - DN25
Most (radiator) valves and underfloor heating manifolds with M30 Connection

Technical Details:-

Power Supply: 24Vac/dc, 50/60Hz
Control Signal: On/Off or PWM (Pulse Width Modulation)
Max Stroke: 4mm
Valve Connection: M30x1.5 Ring Nut
Force: 140N
Feedback Signal (M-models only): 0.7A 250V~
Ambient Temp: 2°C to +50°C