Overview
The Siemens VKF41.65H-MH is a high-temperature wafer-style butterfly valve designed specifically for the control of hot gases, such as flue gas recirculation (FGR) and hot air systems. This DN65 (2.5-inch) valve features a manual handle (-MH) that allows it to function as a manual flow restrictor with a locking mechanism to secure the valve disk at any desired position. Engineered for durability in extreme environments, it utilizes a metallic tight-closing design and high-grade materials to ensure reliable performance in combustion plants and industrial process applications.
Features
- High-temperature resistance suitable for media up to 550°F (288°C)
- Manual handle kit (-MH) includes a position indicator and clamping pieces for locking
- 360-degree angular rotation for flexible flow adjustment
- Metallic tight-closing seat for minimal leakage in the closed position
- Wafer-type design for easy installation between standard pipe flanges
- Maintenance-free construction for reduced operational downtime
- Bidirectional flow capability allows for installation in either direction
Specifications
- Model: VKF41.65H-MH
- Nominal Size: DN65 (2.5 inches)
- Connection Type: Wafer style (mounts between PN6, PN10, PN16, or ANSI flanges)
- Maximum Temperature: 550°F (288°C)
- Body Material: Cast iron (EN-GJL-250)
- Disk and Shaft Material: Stainless steel
- Shaft Seal: PTFE (High-temp version)
- Flow Coefficient (kvs): 231 (approximate)
- Angular Rotation: 360°
Applications
- Flue gas recirculation (FGR) in industrial combustion systems
- Hot air flow control in heating and process plants
- Manual flow restriction and balancing in gas trains
- Integration into burner systems for air and gas modulation
- Waste heat recovery and high-temperature ventilation systems



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