Product Overview

The Siemens SQM40 and SQM41 series burner servomotors are robust electromechanical actuators used for controlling combustion air dampers, gas valves, and oil flow control valves in industrial burner systems. These servomotors regulate the flow of fuel and combustion air based on burner load conditions, ensuring safe and efficient burner operation.

These actuators are commonly used in medium- to high-capacity industrial burners and thermal process plants, where accurate positioning of dampers and valves is essential for stable combustion control.

The SQM40/41 series can operate with 3-position controllers, modulating controllers (such as 4–20 mA signals), or directly with burner management systems, making them highly versatile for different combustion control setups.

These servomotors feature durable metal housing, adjustable cam switches, internal position indication, and disengageable drive shafts, allowing easy installation, adjustment, and maintenance.

The SQM40 and SQM41 models differ mainly in rotation direction and torque characteristics, enabling compatibility with various burner designs and mechanical linkages.

Key Features

Electromotoric actuator for air dampers and fuel control valves

Designed for oil and gas industrial burners

Suitable for medium and high-capacity burner systems

Clockwise and counter-clockwise rotation variants

Compatible with 3-position or modulating controllers

Adjustable limit switches and auxiliary cams

Internal position indicator for accurate positioning

Disengageable drive shaft for manual adjustment

Heavy-duty die-cast metal housing

Reliable performance in demanding industrial environments

Applications

• Industrial gas burners

• Industrial oil burners

• Dual-fuel burner systems

• Steam boiler burners

• Thermal oil heaters

• Industrial furnaces and ovens

• Thermal process plants

Why Choose Siemens SQM40 / SQM41 burner servomotor?

Trusted Siemens combustion control technology

Accurate air-fuel ratio control for efficient combustion

Compatible with Siemens burner management systems

Robust construction for long industrial service life

Flexible installation for multiple burner configurations

Reliable performance under high-temperature environments

Technical Description

The Siemens SQM40 / SQM41 burner servomotor uses an electromotoric drive with an integrated gear system to rotate and position air dampers or fuel control valves in industrial burner systems. The actuator adjusts combustion air and fuel flow according to burner load requirements.

The servomotor supports modulating control signals such as 4–20 mA or 3-position control, enabling integration with burner controllers, PLC systems, or combustion management systems.

The actuator includes adjustable cams and auxiliary switches, allowing specific switching points for ignition, low-fire, and high-fire burner positions.

The housing is designed for industrial environments and can deliver high torque performance up to approximately 18 Nm, making it suitable for larger burner applications.

Technical Specifications