What is double eccentric soft sealing butterfly valve

Butterfly valve,also known as flap valve, is one kind of regulating valve with simple structure,which can be used for switching control of low pressure pipeline systems. The closing-opening part of butterfly valve is one kind of disc, which rotates around the valve shaft to achieve the opening and closing of the butterfly valve.

1. Types of butterfly valves 

According to different structure, butterfly valve can be divided into concentric butterfly valve, eccentric butterfly valves, for eccentric butterfly valves, there are single eccentric butterfly valves, dual eccentric butterfly valves, triple eccentric butterfly valves. 

For concentric butterfly valves, with different end, concentric butterfly valves can be divided into wafer concentric butterfly valves, lugged type concentric butterfly valves, flange type concentric butterfly valves. 

For double eccentric butterfly valves, with different sealing material used, double eccentric butterfly valve can be divided into double eccentric soft sealing butterfly valves and double eccentric hard sealing butterfly valves. And today we are going to introduce the double eccentric soft sealing butterfly valve. 

2. Introduction of double eccentric soft sealing butterfly valve

Double eccentric soft sealing butterfly valve is also called high performance butterfly valve. Double eccentric soft sealing butterfly valve is mainly used for water drainage in water plants, power plants, steel smelting, chemical industry, water source engineering, and environmental facility construction. Double eccentric butterfly valve is especially suitable for water pipeline systems to be used as the regulating and cutting-off equipment. Compared with concentric butterfly valve( also called center line butterfly valves), the double eccentric soft sealing butterfly valve is more resistant to high pressure, has a longer service life and better stability. 

3. How double eccentric soft sealing butterfly valve works?

Double eccentric soft sealing butterfly valve is further improved on the basis of single eccentric butterfly valve. The structure feature of double eccentric soft sealing butterfly valve is that the axis center of the valve shaft deviates from the center of the valve plate(valve disc) and the center of the valve body at the same time. The effect of double eccentricity makes the valve plate break away from the valve seat immediately after the double eccentric butterfly valve is opened, which greatly eliminates unnecessary excessive extrusion and scraping between the valve plate and the valve seat, also reduces the opening resistance, reduces wear, and improves the life of the valve seat. 

4. The structural advantages of double eccentric soft sealing butterfly valve: 

4.1. The double eccentric soft sealing butterfly valve has reasonable design,compact structure, and is easy for assembly and disassembly, and convenient for maintenance; 

4.2. The double eccentric soft sealing butterfly valve adopts eccentric structure, which reduces the friction of the sealing ring, and prolongs the service life of the valve. 

4.3. The double eccentric soft sealing butterfly valve can achieve complete sealing with zero leakage. Dual eccentric soft sealing butterfly valve can be used in ultra-high vacuum conditions. 

4.4. The material for the valve plate sealing ring, valve plate, valve shaft and other parts of the double eccentric soft sealing butterfly valve can be changed, which can make the double eccentric soft sealing butterfly valve more suitable for different medias and different temperatures. 

How double eccentric soft sealing butterfly valve looks like:

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