Double eccentric butterfly valve, also known as high-performance butterfly valve, is mainly applicable to the drainage of Dalian marine valve system, such as water plant, power plant, steel plant smelting, chemical industry, water source spring project, environmental facilities construction, etc., especially applicable to the waterway pipeline, as the regulating and intercepting equipment. Compared with the center line butterfly valve, the double eccentric butterfly valve is more resistant to high pressure, longer life and better stability.

Double eccentric butterfly valve is further improved on the basis of single eccentric butterfly valve. Its structural feature is that the shaft center of the valve stem deviates from both the center of the butterfly plate and the center of the body. The double eccentric effect enables the butterfly plate to be separated from the valve seat immediately after the valve is opened, greatly eliminating the unnecessary excessive extrusion and scraping between the butterfly plate and the valve seat, reducing the opening resistance, reducing the wear and improving the service life of the valve seat. At the same time, the double eccentric butterfly valve can also adopt metal valve seat, which improves the application of butterfly valve in high temperature field.

Structural features

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

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

3 completely sealed with zero leakage. It can be used in ultra-high vacuum conditions.

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

The double eccentric butterfly valve is mainly used in the preheating system and dry dedusting system of iron making blast furnace with large nominal diameter, low working pressure and opening and closing pressure difference and high temperature (200-350 ℃), as the combustion air cut-off valve, combustion gas cut-off valve, gas inlet and outlet cut-off valve of heat exchanger system, flue gas inlet and outlet cut-off valve of heat exchanger system and gas cut-off valve of dry dedusting system. The double eccentric butterfly valve is formed by gradually improving the ordinary butterfly valve to adapt to different working conditions (working temperature and pressure).