Metal Seated Double Offset Flanged Butterfly Valve
Looking for a robust and reliable valve solution for demanding high-temperature and high-pressure applications? Our Double Eccentric Flange Butterfly Valve, Metal Seated is engineered to excel. This advanced valve design, also known as a double offset butterfly valve, incorporates a metal-to-metal seat for superior sealing performance in the most challenging conditions, including abrasive media and extreme temperatures. It effectively overcomes the limitations of traditional resilient-seated valves. The unique geometry of the disc, with its two offsets from the seat and stem axes, minimizes wear and torque, ensuring a long service life and exceptional tight shut-off. Our Metal Seated Double Eccentric Flange Butterfly Valve is the industry-preferred choice for critical isolation tasks in power generation, oil & gas, chemical processing, and other heavy industries where reliability is non-negotiable.
The Metal Seated Double Offset Flanged Butterfly Valve operates on a sophisticated principle. Its primary feature is the double eccentricity (or offset) of the disc. The first offset positions the stem axis behind the disc's seating plane, while the second offset positions it off-center from the pipeline's centerline. This innovative design ensures that the disc only contacts the metal seat in the final few degrees of closure and opening, virtually eliminating sliding friction during 90% of its operation. This translates to significantly reduced wear on the sealing surfaces, lower operating torque, and a dramatically extended valve lifecycle. The metal seating surfaces, often hardened or coated with specialized materials like Stellite, provide excellent resistance to erosion, corrosion, and high temperatures, guaranteeing zero leakage and dependable performance over thousands of cycles.
Key Features & Specifications
- Design Standard: API 609, API 608, ISO 10631
- Pressure-Temperature Ratings: Complies with ASME B16.34
- Fire Safe Design: Certified to API 607/API 6FA/ISO 10497 standards
- Bidirectional Sealing: Effective sealing in both flow directions
- Low Operating Torque: Reduces actuator sizing and energy requirements
- High Cycle Life: Durable metal seat design for frequent operation
Detailed Technical Parameters
| Parameter | Specification / Range |
|---|---|
| Size Range (Nominal) | 3" (DN80) to 60" (DN1500) |
| Pressure Class | ANSI 150, ANSI 300, PN10, PN16, PN25, PN40 |
| Temperature Range | -29°C to +600°C (-20°F to +1112°F) depending on seat material |
| Body & Disc Material | Carbon Steel (WCB, LCC), Stainless Steel (CF8, CF8M, CF3, CF3M), Duplex/Super Duplex |
| Seat Material | Stellite (Co-Cr alloy), Inconel, 316SS, 17-4PH, with various hard coatings |
| Stem Material | 17-4PH, 316SS, Monel, or other high-strength alloys |
| End Connection | Flanged per ANSI B16.5, ASME B16.47, EN 1092-1, JIS B2220 |
| Leakage Class | Zero Leakage (Metal Seated), up to ANSI/FCI 70-2 Class IV (Soft Seated Variants) |
| Operation | Manual (Lever, Gear), Pneumatic Actuator, Electric Actuator, Hydraulic Actuator |
Available Options & Customizations
- Extended neck design for high-temperature insulation
- Anti-static device as per API 608
- Locking device for safety in critical applications
- Special seal welding for nuclear or ultra-high purity services
- Various disc edge trims for specific flow control characteristics
- Position indicators, limit switches, and solenoid valves for automated systems
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