Eccentric Butterfly Valve

Specifications:

  • Size: 2in-20in

  • Pressure: 150LB

  • Standard:  API 609, API 598,ANSI B16.1

Materials:

  • Body :Ductile Iron / GGG50

  • Seal : Ductile Iron+EPDM

  • Stem : Stainless Steel JMGN

Characteristic:

  • Medium: Water, Waste Water

  • Temperature: 0 to 100℃

Double Eccentric Butterfly Valve

Detail / Feature / Application

Detail / Feature / Application

  • Double-eccentric butterfly valves require only little space within pipeline systems.

  • Application:water treatment,  pipelines,power plants.

  • Due to the double-eccentric valve bearing, the strain of elastomers is reduced at the sealing area thereby cutting maintenance efforts.

  • Compared with closure devices positioned vertically to the pipeline, they feature a more favourable inflow to the clap disc over the entire pivoting range.

  • And last but not least, they have lower actuating moments, especially with larger nominal diameters.


Double eccentric butterfly valves are utilised in water intake systems, cooling water systems, filtering systems and industrial waste water in the power industry, chemical and petro chemical waste water plants, steel industry, etc.

The double eccentric butterfly valve is further improved on the basis of the single eccentric butterfly valve. Its structural feature is that the shaft center 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. But because its sealing principle is a positional sealing structure, that is, the sealing surface of the butterfly plate and the valve seat is in line contact, and the elastic deformation caused by the butterfly plate squeezing the valve seat produces a sealing effect, so the closing position is very demanding (especially metal Valve seat), low pressure bearing capacity, which is why traditionally people think that butterfly valves are not resistant to high pressure and have large leakage. The main features of this valve are:

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

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

③The valve plate adopts the "T" type structure, and the sealing surface is linearly sealed.

④Completely sealed, zero leakage.

⑤ Replace the material of the valve plate sealing ring, "O" ring, butterfly plate, shaft, etc., which can be applied to a variety of media and different temperatures.



Read More

+86 188 2269 6060