Siemens Actuator SQM45.291B9

The Siemens SQM45.291B9 is a rotary actuator used in burner and heating systems to position air dampers and mixing valves. Its type designation is We651470 and it is classified under the category Actuator. It translates a control signal into rotary motion to adjust the damper or valve.

Parts of this type are selected by torque, running time, control signal format (three-point, 0-10 V, or on/off), shaft or coupling pattern, angle of rotation, and the presence of auxiliary switches. When replacement is needed, verify the control signal type and voltage, running time, shaft dimensions or coupling pattern, and required angle of rotation. If auxiliary switches are used, ensure that the replacement has equivalent switching points, and confirm that the mounting interface matches the existing bracket or valve flange.

Typical failures of this kind include stripped gear trains, failed end switches, and seized valve stems after prolonged standstill. Such faults may prevent the actuator from moving the attached damper or valve to the commanded position.