Double Eccentric Flange Type Butterfly Valve

Place Of Origin:Tianjin, China
Temperature :-10 to 120℃
Connection: flange 
Body material:stainless steel
nominal pressure:PN10 / PN16
Payment Method:L/C, D/A, D/P, T/T, Paypal
Supply Capacity:according to size 100-15000sets /pieces per month
Standard Packaging:Wooden box or customized

Technical Specification:

Design Standard: API609

Pressure Temperature Rating: API609, ASME B16.34

Face to Face: API609, ISO5752, ASME B16.10

Flange Ends: ASME B 16.15/B16.47

Inspection & Test: API598

Application Medium: water, oil, gas and other causticity medium


The butterfly valve integrates advantages of both concentric rubber lined butterfly valve and eccentric soft seal butterfly valve.It is designed as a device to shut-off or regulate the working medium flow and installed in indusigned as a device with corrosive medium,such as weak acid,Alkali and etc.

Features and Benefits.

1.Double eccentric structure provides a very low friction torque,rapid open-close.excellent operation.light weight and labor saving.

2.Body and disc vulcanised with hard rubber are cornpletely isolated from working medium.

3.Integrated advantages of common concentric rubber lined butterfly valve and double eccentric soft seat butterfly valve.

4.Zero leakage sealing in bi-directional.

5.Special for corrosive working medium such as sulfuric acid and provides long life service and significant cost saving.

Butterfly Valve Characteristic:

1. Elastic property of composite metal sealing ring to perform zero leakage.
2. Torque seal to ensure persisitent two-way zero leakage.
3. The design of right-angled rotation with zero friction is implemented by the distinctive triple eccentric principle. It eliminates the friction between the seat and sealing ring in 90° rotation.
4. STL one-piece hard-surface seat may adapt to many working conditions, which is featured by long service life and easy maintemance.
5. One-piece cast body, face-to-face dimensions conforming to ISO5752, ASME B16.10 and API609, replacement to high performance fireproof property thanks to all metal structure and leak-tight performance.
6.Anti-blowout stem for high dependability, completely conforming to API609.
7.The valve position indicator on the stem and the flange mounted at the top are in favor of the indication of disc position.


Face To Face: API 609, MSS SP-67, DIN3202, BS EN558-1
Pressure Test: API 598
Flange Drilling: ANSI B16.1 class125, BS4504 PN10/PN16, DIN2501 PN10/PN16
Top Flange: ISO5211

Pressure & Temperature ratings:

Working Pressure

PN10 / PN16

Testing Pressure

Shell: 1.5 times rated pressure,
Seat: 1.1 times rated pressure.

Working Temperature

-10°C to 80°C (NBR)
-10°C to 120°C (EPDM)

Suitable Media

water, oil, gas and other causticity medium.


Main material list:

Size Range


body Materials

cast iron, stainless steel, carbon steel

Stem Materials

SS416, SS304, SS316

Disc Materials


Seat Materials