The Siemens Combustion VA41.25 Series provides a comprehensive range of pre-engineered, fully integrated Valve and Actuator (VA) assemblies. By combining the high-torque Siemens SQM41.25 actuator with a wide variety of VKP proportional valves and PBA blower adapters, these complete assemblies eliminate the guesswork of field mounting and linkage adjustments. Specifically designed for applications requiring clockwise rotation (looking at the actuator shaft), this series offers unparalleled air and fuel ratio control across hundreds of configurations for modern industrial burner management.
Technical Specifications
- Product Family: Siemens Combustion VA41.25 Series (Complete Assemblies)
- Actuator Included: Siemens SQM41.25 (Electronic Stepper, Pre-Mounted)
- Rotation Direction: Clockwise (CW)
- Actuator Performance: High-Torque 25-second running time / 90 in-lbs torque
- Valve Compatibility: VKP Proportional Valves and PBA Manifolds
- Applications: Precision Fuel/Air Ratio Control, Premix Blowers, Industrial Boilers
Key Features & Benefits
- Ready-to-Install Assemblies: Each VA41.25 unit arrives factory-assembled with engineered brackets and rigid couplings to ensure zero backlash and perfect shaft alignment right out of the box.
- High-Torque Performance: The “.25” motor profile utilizes a heavy-duty 25-second (90-degree) gearing system, outputting 90 in-lbs of turning force to ensure smooth, reliable movement of proportional valve bodies even under high-demand conditions.
- Clockwise (CW) Logic: The SQM41 actuator is the clockwise-rotating counterpart to the SQM40 series, allowing for specific piping geometries and burner configurations that require CW opening logic.
- Extensive Proportional Sizing: Covers a massive range of proportional valve bore sizes and “Reduced port” options (denoted by “R”) to match the exact stoichiometry and turndown requirements of your burner.
- Flexible PBA Manifolds: Assemblies featuring NF, NM, and NR designations provide specialized premix blower adaptation for a homogenized air/fuel mixture.
VA41.25 Parts We Provide
VA41.25-0.5-1.0VKP-0.5
VA41.25-0.75-0.5VKP-0.5
VA41.25-0.75-0.5VKP-0.75
VA41.25-0.75-0.75VKP-0.75
VA41.25-0.75-1.0VKP-0.75
VA41.25-1.0-0.5VKP-1.0
VA41.25-1.0-0.75VKP-0.75
VA41.25-1.0-0.75VKP-1.0
VA41.25-1.0-1.0VKP-1.0
VA41.25-1.25-0.5VKP-1.25
VA41.25-1.25-0.75VKP-1.0
VA41.25-1.25-0.75VKP-1.25
VA41.25-1.25-1.0VKP-1.0
VA41.25-1.25-1.0VKP-1.25
VA41.25-1.25-1.25VKP-1.25
VA41.25-1.5-0.5VKP-1.5
VA41.25-1.5-0.75VKP-1.5
VA41.25-1.5-1.0VKP-1.0
VA41.25-1.5-1.0VKP-1.25
VA41.25-1.5-1.0VKP-1.5
VA41.25-1.5-1.25VKP-1.25
VA41.25-1.5-1.25VKP-1.5
VA41.25-1.5-1.5VKP-1.5
VA41.25-1.5-1.5VKP-2.0
VA41.25-1.5-2.0VKP-1.5
VA41.25-2.0-1.25VKP-1.25
VA41.25-2.0-1.25VKP-1.5
VA41.25-2.0-1.25VKP-2.0
VA41.25-2.0-1.5VKP-1.5
VA41.25-2.0-1.5VKP-2.0
VA41.25-2.0-2.0HVKP-2.0
VA41.25-2.0-2.0SVKP-2.0
VA41.25-2.0-2.0VKP-2.0
VA41.25-NF-050H
VA41.25-NF-075
VA41.25-NF-100
VA41.25-NF-125
VA41.25-NF-150
VA41.25-NF-200
VA41.25-NF-250
VA41.25-NF-300
VA41.25-NF-400
VA41.25-NM-100
VA41.25-NM-125
VA41.25-NM-150
VA41.25-NM-200
VA41.25-NM-250
VA41.25-NM-300
VA41.25-NM-400
VA41.25-NR-150
VA41.25-NR-200
VA41.25-NR-250
VA41.25-NR-300
VA41.25-NR-400
VA41.25-X-0.5VKP-X
VA41.25-X-0.75VKP-X
VA41.25-X-1.0VKP-X
VA41.25-X-1.25VKP-X
VA41.25-X-1.5VKP-X
VA41.25-X-2.0HVKP-X
VA41.25-X-2.0SVKP-X
VA41.25-X-2.0VKP-X
We ship these products worldwide! Delivery is normally stock.
Request a Quote now or call us at 1-800-755-2883 for expert assistance.
Frequently Asked Questions
What is the difference between VA40.25 and VA41.25?
The key difference is the direction of rotation. VA40 assemblies use the SQM40 actuator, which rotates counter-clockwise (CCW) to open. VA41 assemblies use the SQM41 actuator, which rotates **clockwise (CW)** to open. They are otherwise technically similar in torque (90 in-lbs) and speed (25 seconds).
What does the “.25” in VA41.25 signify?
The “.25” indicates the actuator’s performance profile: it is a high-torque motor with a 25-second running time for a 90-degree sweep, equipped with a specific internal electronic board compatible with modern Siemens Burner Management Systems.
What do the “X” and “R” placeholders mean in these part numbers?
The “X” acts as a placeholder for field-configurable or custom port sizing options. An “R” (e.g., 0.5R) indicates a **Reduced Port** valve body, which allows for finer control at lower flow rates while using a larger physical body size.
What are the “NF”, “NM”, and “NR” designations?
These codes identify Premix Blower Adapters (PBAs). These specific VA assemblies use a specialized manifold designed to introduce and balance fuel gas directly into an air stream immediately prior to a premix blower.
Do these clockwise-rotating assemblies require special BMS programming?
The direction of rotation is a mechanical property of the SQM41 actuator. While the burner management system (BMS) controls the percentage of opening, the physical wiring and mounting must account for the clockwise logic to ensure the valve opens when commanded.