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Here are key features and characteristics of a full bore butterfly valve


A full bore butterfly valve, also known as a full bore wafer butterfly valve or a full bore lug butterfly valve, is a type of butterfly valve designed to provide unobstructed flow through the pipeline when fully open. The term "full bore" refers to the fact that the internal diameter of the valve matches the internal diameter of the connecting pipes, allowing for minimal flow restriction.

Here are key features and characteristics of a full bore butterfly valve:

1. Disc Design:

  - The valve features a disc or plate that rotates on a central spindle. In the fully open position, the disc is parallel to the flow, allowing for unimpeded passage of the fluid.

2. Quarter-Turn Operation:

  - Like other butterfly valves, a full bore 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. Wafer or Lug Style:

  - Full bore butterfly valves are available in both 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.

4. Minimal Flow Restriction:

  - The design of the full bore butterfly valve ensures minimal flow restriction, allowing for a straight and unobstructed path for the fluid when the valve is fully open.

5. 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.

6. Resilient Seat Options:

  - Many full bore 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.

7. Manual or Actuated Operation:

  - Full bore 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.

8. Size Range:

  - These valves are available in various sizes, making them suitable for different pipe diameters and flow rates. The size of the valve should match the size of the connecting pipes.

9. Applications:

  - Full bore butterfly valves are commonly used in applications where minimal flow restriction is critical. They are found in industries such as water treatment, HVAC systems, chemical processing, and general industrial processes.

10. 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.

11. Corrosion Resistance:

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

Full bore butterfly valves are known for their simplicity, ease of operation, and suitability for applications where maintaining a smooth and unobstructed flow path is essential. Proper selection based on the application requirements is crucial for optimal performance.

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