Double Eccentric Flanged Valve
Double Eccentric Flanged Valve
Model NO.
D342X
Size Range DN200~DN2000
Nominal Pressure 10bar/16bar
Suitable Temperature -20~100°C
Suitable Medium Water, sea water, gas and other non‑corrosive medium
Design Standard: GB/T 12238
Face‑to‑Face: GB/T 12221
Connection Size: GB/T 17241.6
Pressure Testing: GB/T 13927
Product Advantages & Application Conditions
Advantages The double eccentric design makes the disc separate from the seat right after the valve starts opening. This eliminates continuous friction between disc and seat, greatly lowering operating torque, extending sealing element service life and achieving bubble-tight shutoff. Flanged connection ensures rigid pipeline assembly, good resistance to pipeline deflection and vibration. Compact structure saves installation space, while wide material options cover diverse fluid media.
Working Conditions Suitable for medium & high pressure pipelines, frequent opening/closing cycles, water, sewage, gas, oil and general chemical media. Widely applied in water treatment, HVAC, power plants, petroleum and chemical industries. Operating temperature ranges depend on seat and body material.
Comparison: Double Eccentric Butterfly Valve VS Concentric (Centerline) Butterfly Valve
Double eccentric butterfly valve is most commonly compared with concentric butterfly valve.
- Concentric butterfly valve: The disc always contacts the seat during rotation. Continuous friction causes rapid seat wear. It is only fit for low pressure, low cycle, clean medium pipelines with low sealing requirements. Low cost but short service life under frequent operation.
- Double eccentric flanged butterfly valve: The disc disengages from the seat quickly upon opening. Minimal friction, less wear, lower torque, reliable tight shutoff. It works for medium pressure, frequent cycles and more complex working conditions. Flanged connection provides stronger pipeline stability than wafer style. It offers better long-term cost performance for demanding industrial projects.
WTY Summary WTY double eccentric flanged butterfly valve adopts standardized design with full certification. It is an ideal upgrade solution replacing concentric butterfly valves for medium-pressure pipelines requiring frequent operation and reliable sealing.
| Technical parameters | |||
| Medium/working condition/ Main Parts | Can be used in water supply and drainage,central air conditioning,heating,sewage, chemical industry,paper making,Marine,food industry,etc | ||
| Body | Ductile iron/WCB/SS.,etc. | ||
| Disc | Ductile iron/WCB | ||
| Seat | NBR | EPDM | VITON |
| Suitable temperature | -20℃~80℃ | -20℃~100℃ | -10℃~180℃ |
| Main Parts and Materials: | ||||||||||||||
| No | Part name | Material | No | Part name | Material | No | Part name | Material | ||||||
| 1 | Body | GGG40 | 13 | Gland packing | NBR | 25 | Washer | 8.8 | ||||||
| 2 | Below shaft | SS420 | 14 | Stud | 8.8 | 26 | Washer | 8.8 | ||||||
| 3 | Seal ring | EPDM | 15 | Washer | 8.8 | 27 | Washer | 8.8 | ||||||
| 4 | Washer | SS304 | 16 | Washer | 8.8 | 28 | Nut | 8.8 | ||||||
| 5 | Bolt | SS304 | 17 | Pin | 45# | 29 | Shaft | |||||||
| 6 | Nut | SS304 | 18 | Gear box | 30 | Cover | GGG40 | |||||||
| 7 | Disc | GGG40 | 19 | Yoke | GGG40 | 31 | Bolt | 8.8 | ||||||
| 8 | Pin | SS420 | 20 | Nuts | 8.8 | 32 | Washer | 8.8 | ||||||
| 9 | Upper shaft | SS420 | 21 | Washer | 8.8 | 33 | Washer | 8.8 | ||||||
| 10 | O ring | NBR | 22 | Washer | 8.8 | 34 | Glandb bush | Copper | ||||||
| 11 | Gland bush | Copper | 23 | Bolt | 8.8 | 35 | O ring | NBR | ||||||
| 12 | Packing gland | GGG40 | 24 | Nut | 8.8 | 36 | Seat | SS304/SS316 | ||||||
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