Double eccentric butterfly valves are commonly used in underground water supply systems as a more cost-effective alternative to gate valves. When installed below ground, they require a shallower burial depth, and they are typically more affordable, particularly in larger sizes, compared to gate valves. They can also be used in above-ground installations.
1：Precision-Machined Stainless Steel Seat Ring: The stainless steel seat ring, with its specially designed rubber sealing profile, ensures a reliable tight shut-off seal, making the valve ideal for flow isolation and shut-off duties.
2：Double Offset Disc Design: This design minimizes seat wear and provides superior throttling performance, enhancing the valve’s versatility in flow control applications.
3：Adjustable Mechanical Stopper: The valve body is equipped with an adjustable mechanical stopper, ensuring precise disc closure without over or under travel, guaranteeing consistent operation.
4：Blowout-Proof Shafts: Both the drive and non-drive end shafts are fully blowout-proof and are guided by self-lubricating bush bearings for added durability and safety.
5：Axial Thrust Bearing: The axial thrust bearing ensures precise disc positioning, preventing uneven load distribution on the valve seat. It also allows for valve installation in any required orientation.
6：Special Shaft Sealing Arrangement: This sealing arrangement ensures zero fugitive emissions and allows for the field replacement of shaft sealing elements, ensuring long-term performance and minimal environmental impact.
7：Field-Replaceable Seat on the Disc: The seat on the disc is fully replaceable in the field, ensuring optimal seating and reseating torque for a reliable seal throughout the valve's life.
8：Versatile Seat Material Options: A variety of seat materials are available, making the valve suitable for both gas and liquid services across a wide range of applications.
| Size | DN | 40mm-300mm | 350mm-1800mm |
| Inch | 1-1/2''-12'' | 14''-72'' | |
| Working | 16bar | 10bar | |
| Testing | Shell | 24bar | 15bar |
| Seal | 17.6bar | 11bar | |
| Seat Material | EPDM | NBR | FKM | PTFE |
| Temperature | -10℃ to 120℃ | -10℃ to 80℃ | -15℃ to 200℃ | -25℃ to 180℃ |
| Part | Material |
| Body | Ductile Iron CF8M Al-Bronze |
| Disc | Ductile Iron CF8M Al-Bronze |
| Shaft | SS410 SS316 |
| Packing | EPDM NBR |
| Seat | Ductile Iron CF8M Al-Bronze |
| Lever | Malleable Iron Carbon Steel Aluminum SS316 |
| Gear Box | Ductile Iron Aluminum SS316 |
