Here are key features and characteristics of an eccentric flanged butterfly valve

An eccentric flanged butterfly valve is a type of butterfly valve that is designed with an offset or eccentric disc, and it features a flanged connection for easy installation and removal in a pipeline system. This type of valve is commonly used in industrial applications for regulating and isolating the flow of liquids and gases. Here are key features and characteristics of an eccentric flanged butterfly valve:

1. Eccentric Disc Design:

  - The term "eccentric" refers to the fact that the center of the disc is offset from the centerline of the valve body. This design helps in minimizing wear and friction during the opening and closing of the valve, reducing the torque required for operation.

2. Flanged Connection:

  - The valve is equipped with flanges on both ends, allowing it to be bolted directly to matching flanges in the pipeline. The flanged connection simplifies installation, maintenance, and removal of the valve.

3. Quarter-Turn Operation:

  - Like other butterfly valves, the eccentric 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.

4. Sealing Mechanism:

  - The sealing mechanism is achieved by pressing the eccentric 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 eccentric 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. Offset Disc for Reduced Wear:

  - The offset or eccentric disc design reduces wear on the seat and extends the valve's service life. It also minimizes friction, making it easier to operate the valve.

7. High-Performance Applications:

  - Eccentric flanged butterfly valves are often used in high-performance applications where tight shut-off, durability, and reduced torque requirements are essential.

8. Manual or Actuated Operation:

  - These 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.

9. Size Range:

  - Eccentric flanged butterfly valves are available in various sizes to accommodate different pipe diameters and flow rates.

10. Applications:

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

11. 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.

12. Corrosion Resistance:

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

Eccentric flanged butterfly valves offer advantages such as reduced wear, lower torque requirements, and ease of installation due to the flanged connection. Their performance and characteristics make them suitable for demanding industrial applications where precise flow control and reliability are critical.