Flanged Butterfly Valves

Key Features:

1. Triple Offset Design:

   • First Offset: The shaft is positioned behind the seat to ensure a tight seal.

   • Second Offset: The shaft is offset from the centerline of the disc, allowing the disc to rotate without rubbing against the seat.

   • Third Offset: The sealing surface of the disc is conical, enabling a cam-like action that ensures a frictionless seal during operation.

2. Flanged Ends:

   • The valve features flanged ends for easy installation and secure connection to pipelines, complying with industry standards such as ASME, ANSI, or DIN.

3. Metal-to-Metal Sealing:

   • The valve uses a metal seat and disc, which provide excellent sealing performance and resistance to high temperatures and pressures. This eliminates the need for elastomeric seals, making it ideal for extreme conditions.

4. Bidirectional Sealing:

   • The triple offset design allows the valve to provide a bubble-tight seal in both flow directions, ensuring zero leakage.

5. Materials:

   • The valve body is typically made from robust materials such as carbon steel, stainless steel, or alloy steel, while the disc and seat are often made from corrosion-resistant materials like stainless steel or exotic alloys.

6. Operation:

   • The valve can be operated manually (via hand lever or gear operator) or automatically (via electric, pneumatic, or hydraulic actuators).

Advantages:

• Zero Leakage: The triple offset design ensures a tight seal, even under high-pressure and high-temperature conditions.

• Long Service Life: The frictionless operation reduces wear and tear, extending the valve's lifespan.

• High Performance: Suitable for critical applications in industries such as oil and gas, petrochemical, power generation, and refining.

• Low Maintenance: The robust design and metal-to-metal sealing reduce the need for frequent maintenance.

• Versatility: Can handle a wide range of fluids, including steam, gases, and corrosive media.

Applications:

• Oil and Gas: Used in pipelines, refineries, and offshore platforms.

• Power Generation: Suitable for steam isolation and control in power plants.

• Chemical and Petrochemical: Ideal for handling corrosive and high-temperature fluids.

• Water Treatment: Used in high-pressure water systems.

Standards:

• API 609: Standard for butterfly valves in the petroleum and natural gas industries.

• ASME B16.34: Covers pressure-temperature ratings and materials for valves.

• ISO 5752: Specifies face-to-face dimensions for butterfly valves.

• ANSI B16.5: Standard for flanged connections.