Overview
The Siemens VKP40.25 is a proportional controlling element designed for the precise regulation of gas or air volume in combustion plants. This 1-inch butterfly-style valve provides a proportional increase of volumetric flow across an angular rotation of 0 to 90 degrees, ensuring stable and accurate air-to-fuel ratio control. Engineered for durability and high positioning cycle frequencies, it is a critical component for systems requiring a wide modulation range and reliable performance in industrial burner applications.
Features
- High-precision proportional control for gas and air volumes
- Wide modulation range exceeding 25:1
- Linear flow characteristic across the 90-degree rotation
- Maintenance-free design with a robust housing and rotation cylinder
- Compatible with a variety of Siemens actuators including SQM and SQN series
- Designed for easy integration between AGF flanges in gas trains
Specifications
- Model: VKP40.25
- Nominal Size: 1 inch (25 mm)
- Connection Type: Flanged (requires AGF10 flanges)
- Angular Rotation: 0 to 90 degrees
- Maximum Operating Pressure: Suited for pressure ranges up to 500 mbar
- Flow Rate: 28 m3/h at delta p 1 kPa when fully open
- Weight: Approximately 3.3 lbs (1.5 kg)
- Compatibility: SQM33, SQM40, SQM45, SQM50, SQN13, and SQN72 actuators
Applications
- Precise modulation of gas flow in industrial and commercial burners
- Ratio-controlled combustion systems requiring continuous modulation
- Integration into gas trains for boiler and furnace controls
- Handling of gas families I, II, III, and air in heating systems
- Proportional increase of volumetric flow in high-demand HVAC environments



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