The double eccentric flange butterfly valve is a butterfly valve that combines a double eccentric structure with a flange connection. Through the double eccentric design of the valve shaft being offset from the center of the butterfly plate and the center of the valve body sealing surface, the butterfly plate and valve seat can be quickly disengaged during opening and closing, reducing friction and wear, and improving sealing performance and service life.
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Double Eccentric Flange Butterfly Valve Technical parameters
Size Range:DN50-DN2000
Body：Ductile Iron, Carbon Steel
Connection Options:Flanged
Working Pressure:PN1.0-2.5MPa
Working Temperature:-40°C to 450°C
Sealing Options: Rubber Seat
Applicable media: fresh water, sea water, oil, and air
Manufacturing Standard:GB/T 122238/AWWA C504,C516/API 609/EN 593/ISO 10631
Double Eccentric Flange Butterfly Valve Features
Double Eccentric Design
First Eccentricity: The valve shaft is offset from the center of the butterfly plate, reducing friction between the butterfly plate and the valve seat during opening and closing.
Second Eccentricity: The valve shaft is offset from the center of the valve body sealing surface, achieving rapid disengagement during opening and closing.
Effect: The butterfly plate quickly disengages from the valve seat after opening, eliminating excessive compression and scraping, reducing wear, and improving valve seat life. Some models use metal hard seals (such as stainless steel, hard alloy), resistant to high temperature and high pressure (≤425℃, PN16-PN25).
Flange Connection
Flange connection is used, providing a stable structure, good sealing performance, and easy installation and disassembly. It is suitable for nominal diameters of DN50-DN4500 and conforms to standards such as GB/T12238 and API609.
Sealing Type
Soft Seal: Materials such as rubber and PTFE, suitable for low temperature and low pressure conditions (≤160℃), with excellent sealing performance but limited temperature resistance.
Metal Hard Seal: Materials such as stainless steel and hard alloy, resistant to high temperature and high pressure, but sealing performance depends on machining precision.
Bidirectional sealing: Some models achieve bidirectional zero leakage through a floating compensation structure, adapting to changes in media flow direction.
Double Eccentric Flange Butterfly Valve drawning
Double Eccentric Flange Butterfly Valve External Dimensions (mm)
| DN (mm) | D | D1 | A | e | b | L | L1 | L2 | L3 | H1 | H2 | H3 | n–φd | Actuator Model |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 50 | 110 | 245 | 30 | – | 60 | 92 | 139 | 357 | 55 | 299 | 270 | 4–14 | DKJ–210 | |
| 80 | 125 | 150 | 245 | 30 | – | 60 | 92 | 139 | 357 | 62.5 | 299 | 270 | 4–18 | DKJ–210 |
| 100 | 145 | 175 | 245 | 30 | 12 | 60 | 102 | 149 | 357 | 72.5 | 299 | 270 | 4–18 | DKJ–210 |
| 125 | 175 | 200 | 245 | 30 | 12 | 60 | 117 | 168 | 357 | 87.5 | 299 | 270 | 8–18 | DKJ–210 |
| 150 | 200 | 225 | 245 | 30 | 12 | 60 | 130 | 181 | 357 | 100 | 299 | 270 | 8–18 | DKJ–210 |
| 200 | 255 | 280 | 245 | 30 | 12 | 70 | 172 | 221 | 357 | 127.5 | 299 | 270 | 8–18 | DKJ–210 |
| 250 | 310 | 335 | 300 | 36 | 14 | 70 | 197 | 258 | 507 | 155 | 340 | 298 | 12–18 | DKJ–310 |
| 300 | 362 | 395 | 300 | 36 | 14 | 80 | 227 | 283 | 507 | 181 | 340 | 298 | 12–23 | DKJ–310 |
| 350 | 412 | 445 | 300 | 36 | 14 | 80 | 252 | 290 | 507 | 205 | 340 | 298 | 12–23 | DKJ–310 |
| 400 | 462 | 495 | 365 | 45 | 16 | 100 | 296 | 348 | 529 | 231 | 400 | 381 | 16–23 | DKJ–410 |
| 450 | 518 | 550 | 365 | 45 | 16 | 100 | 321 | 371 | 529 | 259 | 400 | 381 | 16–23 | DKJ–410 |
| 500 | 558 | 600 | 365 | 45 | 16 | 100 | 346 | 396 | 529 | 284 | 400 | 381 | 16–23 | DKJ–410 |
| 600 | 660 | 685 | 365 | 45 | 16 | 150 | 480 | 418 | 530 | 377.5 | 863 | 482 | 20–25 | DKJ–410 |
| 700 | 820 | 420 | 511 | 60 | 25 | 200 | 505 | 531 | 530 | 587.5 | 917 | 480 | 28–30 | DKJ–510 |
| 800 | 970 | 420 | 51 | 60 | 200 | 550 | 586 | 28–30 | DKJ–510 | |||||
| 1000 | 1175 | 1120 | 420 | 51 | 60 | 200 | 735 | 721 | 681 | 28–30 | DKJ–510 | |||
| 1200 | 1340 | 1400 | / | 60 | 250 | 980 | / | DKJ–610 | ||||||
| 1400 | 1520 | 1575 | / | 60 | 300 | 965 | 1012 | 36–30 | DKJ–610 | |||||
| 1600 | 1730 | 1785 | / | 60 | 350 | 1065 | 1112 | 36–30 | DKJ–610 | |||||
| 1800 | / | 60 | 25 | 44–30 | DKJ–610 | |||||||||
| 2000 | 2100 | 2200 | / | 60 | 25 | 350 | 1217 | 1315 | / | DKJ–610 |
Double Eccentric Flange Butterfly Valve Applications:
Municipal Water Supply and Drainage Systems
In urban water supply pipelines, double eccentric flange butterfly valves respond quickly to flow changes, ensuring stable water supply.
In wastewater treatment plants, they regulate sludge flow, improving efficiency by 20% and extending maintenance cycles to 2-3 years.
Chemical and Power Industries
In chemical pipelines, metal hard-seal models are corrosion-resistant and high-temperature resistant, suitable for transporting acid and alkali solutions.
In thermal power plant circulating water systems and steam pipelines, valves with high-pressure resistance reduce energy loss, achieving an annual energy saving rate of 8%.
Metallurgy and Thermal Power
In steel mill smelting processes, valves regulate high-temperature flue gas flow, optimizing combustion efficiency.
In heating station systems, they precisely control the flow of hot and cold media, achieving accurate indoor temperature regulation (adjustment accuracy ±1%).
Building Fire Protection Systems
In fire protection pipelines, valves with rapid opening and closing functions meet emergency shut-off needs, ensuring fire safety.
Double Eccentric Flange Butterfly Valve factory
