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Double Eccentric Flange Butterfly Valve

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Shandong Ronborn Machinery Technology Co.,Ltd, with professional factory, is one of the leading China cast iron butterfly valve manufacturers, we are able to offer you cheap cast iron butterfly valve. Welcome to wholesale products from us.
1) Double eccentric structure, the butterfly plate quickly leaves the seat when it is opened, the tighter the function when it is closed, the operating torque is small, (compared with no eccentric), and the seat life is long.
2) Reliable sealing performance, zero leakage, opening and closing life of tens of thousands of times.
3) Butterfly plate integrated streamline design, flow resistance coefficient is small, high strength and other advantages.
4) The anti-corrosion inside and outside the valve adopts non-toxic electrostatic epoxy resin spraying, the thickness can reach 0.25mm-0.45mm, good anti-corrosion performance, long aging, to avoid secondary pollution to water.
Applicable working conditions:
Suitable medium: water
Applicable temperature: ≤0 ~ 80℃
Nominal pressure: PN1.0MPa PN1.6MPa

Product Detail

Product Tags

Double eccentric butterfly valve is further improved on the basis of single eccentric butterfly valve, which is the most widely used double eccentric butterfly valve.

Its structural characteristics are that the axis of the valve stem deviates from the center of the butterfly plate and from the center of the body. The effect of double eccentricity enables the disc to be quickly removed from the seat after the valve is opened, greatly eliminating unnecessary excessive squeezing and scratching between the disc and the seat, reducing the opening resistance, reducing wear, and improving the seat life. The scratch is greatly reduced, and at the same time, the double eccentric butterfly valve can also use metal seats, which improves the application of butterfly valves in high temperature fields.

Components and Materials

No. Name Materials
1 Valve Body Ductile Iron QT450-10
2 Gate Ductile Iron QT450-10
3 Valve plate sealing ring pressure ring 304 Stainless Steel/QT450-10
4 Gate Sealing Ring EPDM
5 Valve Seat 304 Stainless Steel
6 Valve Shaft 304 Stainless Steel
7 Bushing Bronze
8 Sealing Ring EPDM
Double eccentric flange butterfly valve

Deatiled Size of Main Parts

Double eccentric flange butterfly valve
Norminal Specification Pressure Dimension(mm)
300 10 445   150 418
16 460   150 428
350 10 505   175 462
16 520   190 476
400 10 565   175 510
16 580   175 520
450 10 615   175 550
16 640   175 560
500 10 670   210 570
16 715   210 620
600 10 780   210 650
16 840   210 710
700 10 895   254 755
16 910   254 770
800 10 1015   254 845
16 1025   254 854


The Double Eccentric Butterfly Valve adopts a double eccentric structure, and the integrated streamline design of the butterfly plate makes the valve highly reliable, small operating torque, short opening and closing time, and good sealing performance. It reduces and avoids maintenance during use, has a long service life, and has good use and social benefits.

The Characteristics of Double Eccentric Butterfly Valve:

1) Double eccentric structure, the butterfly plate leaves the valve seat quickly when opening, and has the function of closing and tightening when closing, the operating torque is small, (compared with no eccentricity), and the service life of the valve seat is long.
2) The sealing performance is reliable, the leakage is zero, and the opening and closing life reaches tens of thousands of times.
3) The integrated streamline design of the butterfly plate has the advantages of small flow resistance coefficient and high strength.
4) The internal and external anti-corrosion of the valve is sprayed with non-toxic electrostatic epoxy resin, the thickness can reach 0.25 mm - 0.45 mm, the anti-corrosion performance is good, the time is long, and the secondary pollution to the water is avoided.

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