On the valve gas butterfly valve eccentric structure introduction
Gas butterfly valve is generally divided into hard seal gas butterfly valve and soft seal gas butterfly valve, mainly used in pipelines, with light volume, easy to use, good sealing performance and many other advantages.
The main structural characteristics of single eccentric gas butterfly valve stem axis deviates from the center of the butterfly plate, so that the upper and lower ends of the butterfly plate no longer become the axis of rotation, dispersion, reducing the hard seal butterfly valve upper and lower ends and the seat of excessive extrusion. However, due to the single eccentric structure in the valve of the entire switching process of the butterfly plate and valve seat scraping phenomenon did not disappear, in the scope of application and concentric butterfly valve is similar, it is not used much.
Double eccentric gas butterfly valve structure mainly in the single eccentric gas butterfly valve has been greatly improved on the basis of its sealing performance has been improved. Its structural characteristics are that the axial center of the valve stem deviates from the center of the butterfly plate and also deviates from the center of the body. The effect of double eccentricity enables the butterfly plate to be separated from the valve seat immediately after the valve is opened, which greatly eliminates unnecessary excessive extrusion and scraping between the butterfly plate and the valve seat, reduces the opening resistance distance, reduces the wear and improves the service life of the valve seat. Scratch greatly reduced, but also makes the double eccentric butterfly valve can also use metal seat, improve the hard seal butterfly valve in the field of high temperature applications.
Three eccentric gas butterfly valve is to make the butterfly plate on the sealing surface and the valve body sealing surface in the valve opening and closing quickly out of contact, reduce friction, reduce torque, increase the life of the sealing surface.
Three eccentric gas butterfly valve is widely used in oil, natural gas, chemical industry, gas pipeline transportation, industrial water treatment, shipbuilding industry, etc. Its advantages are light weight, small size, rapid opening and closing, small operating torque, no wear and tear, long service life, easy maintenance and many other advantages.