Here are key features and characteristics of flanged butterfly valves

A flanged butterfly valve is a type of quarter-turn valve that uses a disc mounted on a shaft to control the flow of fluid in a pipeline. The valve gets its name from the use of flanges on both ends, which allow it to be easily installed between two flanged pipe connections. Flanged butterfly valves are widely used in various industries for regulating and isolating the flow of liquids and gases. Here are key features and characteristics of flanged butterfly valves:

1. Flanged Connection:

  - Flanged butterfly valves are equipped with flanges on both ends, allowing them to be bolted directly to matching flanges on the pipeline. This design simplifies the installation, removal, and maintenance of the valve.

2. Quarter-Turn Operation:

  - Like other butterfly valves, the flanged butterfly valve operates on a quarter-turn principle. It can be quickly opened or closed with a 90-degree rotation of the valve handle or actuator.

3. Disc Design:

  - The valve features a disc or plate that is mounted on a shaft in the center of the valve body. When the valve is fully open, the disc is parallel to the flow, allowing for unobstructed passage.

4. Sealing Mechanism:

  - The sealing mechanism is achieved by pressing the disc against the valve seat. This design provides a tight shut-off when the valve is in the closed position.

5. Resilient Seat Options:

  - Many flanged butterfly valves come with resilient seats made of materials such as EPDM or NBR (Nitrile). Resilient seats provide a tight seal and are suitable for a variety of applications.

6. Manual or Actuated Operation:

  - Flanged butterfly valves can be operated manually using a handle or lever. They can also be equipped with actuators (electric, pneumatic, or hydraulic) for remote and automated operation.

7. Size Range:

  - These valves are available in various sizes to accommodate different pipe diameters and flow rates. The size of the valve should match the size of the connecting pipes.

8. Pressure and Temperature Ratings:

  - The pressure and temperature ratings of the valve are important considerations to ensure that it can handle the specific conditions of the application.

9. Applications:

  - Flanged butterfly valves find applications in a wide range of industries, including water treatment, wastewater, chemical processing, power generation, HVAC systems, and general industrial processes.

10. Corrosion Resistance:

   - The valve may have coatings or linings to enhance its corrosion resistance, especially if it is used in corrosive environments.

11. High-Performance Versions:

   - High-performance versions of flanged butterfly valves are available for applications that require tight shut-off, durability, and precise flow control.

12. Wafer or Lug Style:

   - Flanged butterfly valves are available in different styles, including wafer and lug designs. Wafer-style valves are typically installed between flanges using bolts, while lug-style valves have threaded inserts or lugs for bolting the valve to the pipeline.

Flanged butterfly valves are versatile and widely used due to their ease of installation, simple operation, and suitability for various applications. Proper selection based on the specific requirements of the application is essential for optimal performance.