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Double Eccentric Flange Butterfly Valve
- Series:Athena Series
- Size:DN150 - DN1800
- Pressure Ratings:PN10, PN16, PN25
- Connections:Double Flange
- Temperature:≤ 80°C
- Medium:Water/Oil/Gas
- Design Standard:EN 593, EN1074-1/2
- Face to Face:EN558 series 13 and series 14
- Flange Standard:EN1092
- Applications:HAVC, Fire protection,water treatment,irrigation, CDU
New double eccentric butterfly valve represents the essence of an efficient butterfly valve designed for when economy is a high priority.
ATHENA is functional and reliable, providing reduced complexity. It covers the needs in standard applications for drinking water in terms of design, materials and standards.
Applications: Water teatment, Water distribution network,Water transmission etc.
Advantages:
- Design and material selection are optimized for use in low and medium pressure drinking water applications.
- Uninterrupted corrosion protection with pin-less connection and closed disc eyes ensure long service life and clean water.
- Flow-efficient design for minimized head loss and low energy consumption significantly reduces the cost of ownership.
- Double bearing kits to furthest reduce the torque, tansfer the weight of disc to body, also it could lock and fix the position of disc for long life using, even the valve could vertical downward direction.
| NO. | DESCRIPTION | OPTIONAL |
| 1 | Body | 300μm |
| 2 | Seat area | Welded stainless steel AISI 309L |
| 3 | Disc | 300μm |
| 4 | Sealing ring | NBR |
| 5 | Retaining ring | CF8M. AISI 316Ti |
| 6 | Drive shaft | AISI 431, Duplex |
| 7 | Trunnion | AISI 431, Duplex |
| 8 | Drive side cover | |
| 9 | End cover | |
| 10 | Dual bearing | |
| 11 | Bush | Bronze PTFE coated |
| 12 | Top sealing kits | |
| 13 | O-ring | |
| 14 | Washer | |
| 15 | Screws | |
| 16 | Locking Screws | |
| 17 | Set screws | |
| 18 | Screws | |
| 19 | Key | |
| 20 | Dual Bearing |
FAQs
A double eccentric (double offset) butterfly valve is a high-performance valve designed with two offsets between the shaft, disc, and sealing surface, reducing friction during opening and closing. This design improves sealing performance and extends service life compared to concentric butterfly valves.
Double eccentric valves reduce seat contact during operation, resulting in less wear and lower torque. Concentric valves have continuous contact, which leads to faster seat wear in large or high-frequency applications.
They are recommended for medium to large diameter pipelines, especially in water transmission systems, HVAC, and fire protection applications where durability and reduced torque are important.
Double offset valves are typically used for water systems and offer a cost-effective solution. Triple offset valves are used in high temperature and high-pressure applications requiring metal sealing.
Yes, they are widely used in water treatment systems due to their reliable sealing performance, corrosion-resistant materials, and low maintenance requirements.
Common pressure ratings include PN10, PN16, and PN25, which are suitable for most municipal and industrial water systems.
Typical materials include ductile iron bodies, stainless steel discs (CF8/CF8M), and EPDM or NBR seats depending on the application.
Selection should be based on pipeline size, pressure rating, media type, operating conditions, and sealing requirements.
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