VKP40.25 Siemens Valve

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