What is a Double Eccentric Butterfly Valve

Also known as a high-performance butterfly valve, the double eccentric valve has an offset disc that minimizes seat contact during operation. This “double offset” design reduces friction and wear, prolonging the valve’s lifespan and ensuring a reliable, tight seal. Unlike standard butterfly valves, the double eccentric configuration provides smoother control, making it ideal for high-demand applications.

Advantages of Double Eccentric Butterfly Valves

1. Superior Sealing Efficiency: The double offset mechanism contacts the seat only during full closure, achieving a bubble-tight seal and effectively reducing the risk of leaks.

2. Minimal Wear and Lower Maintenance: Reduced friction between the disc and seat extends the valve’s operational life and minimizes maintenance requirements.

3. Precise Flow Control: Offering refined flow regulation, these valves are ideal for throttling and critical control applications.

4. Resistance to High Pressure and Temperature: Built from resilient materials, double eccentric butterfly valves withstand the intense conditions that could compromise standard valves.

Applications of Double Eccentric Butterfly Valves

• Water Treatment: Ensures secure sealing and optimized flow control in filtration and distribution systems.
• Oil and Gas: High resistance to pressure and temperature makes them perfect for pipelines and refining processes.
• Power Generation: Maintains precise control in steam and cooling systems.

How Double Eccentric Butterfly Valves Compare to Other Valves

• Single Offset Valves: The disc is aligned with the valve axis, causing consistent seat contact and increased wear.
• Triple Offset Valves: Adding a third offset with a conical sealing surface, these valves offer even better performance and zero leakage, suitable for the most stringent applications.

Selecting the Right Double Eccentric Butterfly Valve

• Material Compatibility: Stainless steel or alloy bodies are ideal for corrosive or challenging environments.
• Size and Pressure Ratings: Ensure the valve’s size and pressure rating match your system’s requirements for optimal performance.
• Seal Type: Options include metal-to-metal and resilient seals, each suitable for specific application needs.

Related Valve Options

While the double eccentric butterfly valve excels in numerous applications, other valve types may be suitable based on specific needs

• Triple Offset Butterfly Valves: Provide ultimate leak-proof performance and enhanced durability for critical applications.
• Wafer-Type Butterfly Valves: Compact and economical, ideal for systems with lower pressure requirements.
• High-Performance Ball Valves: For precise control in heavy-duty conditions, high-performance ball valves are another viable option.