Butterfly valve is a kind of switch by the stem drive disc rotating 90 degrees, its working principle is simple. Many butterfly valve points, according to their seat form we can be divided into single eccentric butterfly valve, double eccentric butterfly valve, triple eccentric butterfly valve, can be used in different workplaces, but choose in selection when we should be how to confirm the eccentric butterfly Industrial Valves? First we need to know the eccentric butterfly valve sealing principle. 1, the single eccentric butterfly valve sealing principle: the eccentric butterfly valve center line butterfly valve, the structure of the center line butterfly valve characteristics as the axis of the stem and disc center, ontology in the same position. Simple structure, convenient manufacturing. To overcome the extrusion, scratches, ensure the sealing performance, basically use the elastic material such as rubber or ptfe seat, but also because of the sealing material in use is limited by temperature, which is why people traditionally butterfly valve is not the cause of the high temperature resistant. 2, double eccentric sealing butterfly valve sealing principle: because on the basis of single eccentric butterfly valve, the rotary center of the disc ( Both the valve shaft center) Form size b offset with the center line of the valve body, making the butterfly valve in the process of opening, the butterfly plate sealing surface will be more quickly than single eccentric sealing butterfly valve from the valve seat sealing surface, butterfly plate rotation to 8 ° ~ 12 °, the butterfly plate seal face completely from the valve seat seal, when fully open, a larger gap formed between two sealing surface y, this kind of butterfly valve design, greatly reduces the mechanical wear and crowded pressure between the two sealing surface deformation, the butterfly valve sealing performance is more improved. 3, triple eccentric butterfly valve sealing principle because on the basis of double eccentric butterfly valve seat centerline to body centerline form a beta Angle offset, make the butterfly valve in the process of opening valve, sealing surface of disc in open moment immediately from the Industrial Valves seat sealing surface, and in the closing moments will contact and pressure valve seat sealing surface. When fully open, between the sealing surface to form a same as the sealed double eccentric butterfly valve clearance y, this kind of butterfly valve design, eliminated the mechanical wear and abrasion between the two sealing surface, make the butterfly valve sealing performance and service life have been greatly improved.
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