Siemens Actuator SQN31.762A2700

This Siemens actuator positions air dampers and mixing valves in boiler and burner systems. It converts a control signal into a defined rotation, moving the linked damper or valve to regulate airflow or water flow. The actuator is identified by the manufacturer code SQN31.762A2700 and type designation 3012916. It is intended to work together with the burner control and the mechanical linkage to the damper or valve stem.

When selecting a replacement actuator of this kind, compare the required torque, the running time for the full stroke, the type of control signal (e.g., three-point, 0-10 V, or on/off), and the shaft or coupling pattern with the existing linkage. The angle of rotation and the presence of integral auxiliary switches must also be considered.

Common failure modes in actuators of this class are stripped gear trains, failed end switches, and seized valve stems after a season of inactivity. When one of these failures occurs, the actuator will not move the damper or valve to the commanded position, leading to incorrect air or water flow regulation.