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Double Eccentric Butterfly Valve

Actuator: Gear Box

Valve Body: HT200 A126 ClassB QT450-10 A536 65-45-12

Valve Disc: QT450-10 A536 65-45-12

Top Shaft: 420 431

Bottom Shaft: 420 431

Body Steel Ring: 316

Disc Sealing Ring: NBR EPDM

Sealing Ring: NBR EPDM

Bushing: ZCuZn38Mn2Pb2, F4 backing Steel

Taper Pin: 420 431

Packing: NBR EPDM

Retainer: QT450-10 A536 65-45-12 Q235-A Gr33

Standard: PN16

Top Flange: ISO 5211

Temperature: -10℃-120℃

Double eccentric butterfly valve is also called high-performance butterfly valve. It is mainly used for drainage of water

 plants, power plants, steel smelting, chemical industry, water source engineering, environmental facility construction, etc.

 It is especially suitable for water pipelines and used as regulation and interception equipment. We offer high quality and 

durable double eccentric butterfly valves that are reliable and have passed the ISO9001 standard.

View product catalogue: Double Eccentric Butterfly Valve  Tianjin LIWEI valve Co.,LTD.pdf



Double Eccentric Butterfly Valve - Liwei

Compared with the centerline butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, has a longer life and good stability. Compared with other valves, the larger the caliber, the lighter the material, and the lower the cost. But because there is a butterfly plate in the middle, the flow resistance is large, so a butterfly valve smaller than DN200 is meaningless.

The double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve. Its structural feature is that the axis of the valve stem deviates from the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to be released from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive extrusion and scratching between the butterfly plate and the valve seat, reduces the opening resistance, reduces wear and improves The life of the valve seat is improved. The scraping is greatly reduced, and at the same time, the double eccentric butterfly valve can also use a metal seat, which improves the application of the butterfly valve in the high temperature field.

Scenarios for double eccentric butterfly valves?

Double eccentric butterfly valves are most commonly used in underground water supply applications as an alternative to gate valves. When installed underground, butterfly valves require a lower depth of embedment and they are often more cost effective than gate valves, especially in larger sizes. They can certainly be used above ground as well.

What is the difference between double eccentric butterfly valve and triple eccentric butterfly valve, zero eccentric butterfly valve?

Double eccentric butterfly valves can be used at higher pressures than zero eccentric butterfly valves. Double offset is available in carbon steel, stainless steel, Hastelloy, and other valve body materials to ANSI Class 600 ratings, with a variety of Teflon seats and fire resistant designs with metal support seats.   

Triple eccentric valves are used in industries similar to double eccentric butterfly valves, but for more demanding applications. If you have any additional questions, please feel free to contact us! Our valve team has years of experience and would be happy to help you!




1. Reasonable design, compact structure, easy assembly and disassembly, and easy maintenance.

2. The eccentric structure is adopted to reduce the friction of the sealing ring and prolong the service life of the valve.

3. Completely sealed, zero leakage. Can be used in ultra-high vacuum conditions

4. Replace the valve plate sealing ring, butterfly plate, shaft and other materials, which can be applied to a variety of media and different temperature.

5. Suitable for high flow rate applications

6. Blowout-proof shaft design with replaceable O-ring shaft seal and self-lubricating bronze/Teflon radial bearings

7. Flap seals are made of potable water approved EPDM rubber that has excellent compression permanent deformation so it can recover its original shape

8. Low operating torque.



Packing Details:

Normal We use 1.1*1.1*1.1m Wooden Box 

Each Valve we use 1 pcs bubble bags and 1 pcs plastic bags 

1   20GP container can loading 20 * 1.1*1.1*1.1m wooden boxes

1   20GP container can loading 24-26Ton

1   40GP container can loading 25-28Ton

Because Double Eccentric Butterfly Valve Size not Standard So Wooden Box all is Customization.

Each Wooden Box weight is 80-100KG 


DN300 1400*1400*600
DN400 1900*620*1300
DN500 2150*1600*800
DN600 2150*800*800
DN700 2150*1000*1000

DN800 2000*1000*900

DN900 2000*1120*900

Copyright © Tianjin LIWEI Valve Co., Ltd. All Rights Reserved | Sitemap Technical Support: Reanod

Factory Add.:

No.3 Xintai Road, Jinnan District, Tianjin, China.

Office Add.:

C12 Aliyun Jinnan District, Tianjin, China.

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