Double Eccentric Flange Butterfly Valve
The sealing of these valves occurs between the body and the elastic ring surrounding the disc. These valves feature extremely low torque and are 100% tightly shut off in the preferred flow direction and can operate at higher pressures than concentric valves. The pressure drop with the disc in the fully open position is minimal due to the two-piece shaft. These valves are self-cleaning, easy to maintain, and simple for assembly and disassembly. These valves are utilized in multiple applications, being particularly suitable for water (drinking water, desalination plants, cooling systems for power generation, waste water, etc.).
Description
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.
Product Features
- 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.
- Double Offset Disc Design: This design minimizes seat wear and provides superior throttling performance, enhancing the valve's versatility in flow control applications.
- 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.
- 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.
- 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.
- 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.
- 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.
- 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.
Working/Testing Pressure
| Size | DN | 40mm-300mm | 350mm-1800mm |
| Inch | 1-1/2"-12" | 14"-72" | |
| Working | 16bar | 10bar | |
| Testing | Shell | 24bar | 15bar |
| Seal | 17.6bar | 11bar | |
Working Temperature
| Seat Material | EPDM | NBR | FKM | PTFE |
|---|---|---|---|---|
| Temperature | -10°C to 120°C | -10°C to 80°C | -15°C to 200°C | -25°C to 180°C |
Material Specification
| 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 |
Corrosion Protection
Epoxy Resin Powder Spray,The minimum thickness is not less than 300 microns
Dimensions
unit: mm
| Size | D | D1 | D2 | fx45° | L | n-φ | A | B | ||
|---|---|---|---|---|---|---|---|---|---|---|
| inch | mm | LONG | MIDDLE | |||||||
| 4" | 100 | 220 | 158 | 180 | 3 | 190 | 127 | 8-19 | 234 | 122 |
| 5" | 125 | 250 | 180 | 210 | 3 | 200 | 140 | 8-19 | 255 | 141 |
| 6" | 150 | 285 | 213 | 240 | 3 | 210 | 140 | 8-23 | 279 | 153 |
| 8" | 200 | 340 | 268 | 295 | 3 | 230 | 152 | 12-23 | 349 | 216 |
| 10" | 250 | 405 | 320 | 355 | 3 | 250 | 165 | 12-28 | 406 | 219 |
| 12" | 300 | 460 | 370 | 410 | 4 | 270 | 178 | 12-28 | 542 | 267 |
| 14" | 350 | 520 | 437 | 470 | 4 | 290 | 190 | 16-28 | 583 | 315 |
| 16" | 400 | 580 | 482 | 525 | 4 | 310 | 216 | 16-31 | 620 | 350 |
| 18" | 450 | 640 | 548 | 585 | 4 | 330 | 222 | 20-31 | 667 | 373 |
| 20" | 500 | 715 | 609 | 650 | 4 | 350 | 229 | 20-34 | 702 | 428 |
| 24" | 600 | 840 | 720 | 770 | 5 | 390 | 267 | 20-37 | 759 | 450 |
| 28" | 700 | 910 | 800 | 840 | 5 | 430 | 292 | 24-37 | 885 | 528 |
| 32" | 800 | 1025 | 905 | 950 | 5 | 470 | 318 | 24-40 | 1013 | 573 |
| 36" | 900 | 125 | 1001 | 1050 | 5 | 510 | 330 | 28-40 | 1071 | 639 |
| 40" | 1000 | 1255 | 1110 | 1170 | 5 | 550 | 410 | 28-43 | 1234 | 723 |
| 48" | 1200 | 1485 | 1330 | 1390 | 5 | 630 | 470 | 32-49 | 1343 | 833 |
| 56" | 1400 | 1686 | 1530 | 1590 | 5 | - | 530 | 36-49 | 1668 | 1078 |
| 64" | 1600 | 1930 | 1750 | 1820 | 5 | - | 600 | 40-56 | 1778 | 1218 |
| 72" | 1800 | 2130 | 1950 | 2020 | 5 | - | 670 | 44-56 | 2044 | 1426 |
Note:
- *The shaft end can be double D and key connection. From DN700 and above, the shaft end is double key type.
- *The flange connection of the above table can be DIN2501 PN16, ASME B16.47-A 125/150LB, BS4504 PN10/PN16, JIS 10K, Table D, Table E
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