Double Eccentric Butterfly Valve Manufacturer in India
For applications where frequent operation and reliable sealing are required, double eccentric butterfly valves offer a practical solution with reduced seat wear and improved durability. The offset disc design minimizes friction during operation, making these valves suitable for systems that demand consistent performance over time.
As a Double Eccentric Butterfly Valve Manufacturer in India, these valves are supplied for services where tight shut-off, longer service life, and smooth operation are important. The design allows the disc to move away from the seat immediately upon opening, reducing contact and extending valve life.
How Double Eccentric Butterfly Valves Work
The double eccentric design features two offsets: one from the centerline of the shaft and another from the centerline of the valve body. This configuration ensures that the disc does not remain in constant contact with the seat.
When the valve begins to open, the disc quickly disengages from the seat, reducing friction. During closing, the disc moves back into position to create a tight seal. This mechanism improves sealing efficiency while minimizing wear on internal components.
Benefits of Double Eccentric Butterfly Valves
- Reduced seat wear due to offset disc design
- Improved sealing performance with minimal friction
- Smooth operation even in frequent cycling conditions
- Lower torque requirements compared to concentric designs
- Suitable for both isolation and throttling applications
- Extended service life in demanding conditions
Design Standards
Double eccentric butterfly valves are manufactured in accordance with international standards to ensure reliability and dimensional accuracy:
- API 609
- ASME B16.34
- EN 593
- BS 5155
Inspection and Testing Standards
Each valve is tested to confirm sealing performance and operational integrity:
- API 598
- ISO 5208
- EN 12266-1
Body and Trim Material Compatibility
| Material | Grade | Applications |
|---|---|---|
| Cast Iron | GG25 | Water and general utility systems |
| Ductile Iron | GGG40 | Water treatment and distribution networks |
| Carbon Steel | WCB, WCC | Oil and gas and industrial applications |
| Stainless Steel | F304, F316, F316L | Corrosive and chemical environments |
| Duplex Steel | F51, 2205 | Offshore and seawater systems |
| Super Duplex Steel | F53, F55, 2507 | High chloride and aggressive media |
| Aluminium Bronze | C95400, C95800 | Marine and desalination applications |
Industries Served
- Oil and Gas: Pipeline isolation and process systems
- Power Generation: Cooling water and auxiliary systems
- Water and Wastewater: Distribution and treatment plants
- Chemical and Petrochemical: Handling corrosive media
- Marine and Offshore: Seawater and offshore applications
- Metal and Steel: Utility and process flow systems
Special Features
- Double offset design for reduced friction and wear
- Improved sealing with extended service life
- Suitable for frequent operation and cycling conditions
- Lower operating torque compared to conventional designs
- Available in manual and actuated configurations
- Custom sizes and pressure ratings based on application
