Let you know the classification of the butterfly valve

The classification of the butterfly valve based on classification, according to the sealing surface material, the form of the structure according to seal form, according to pressure of work. According to the classification of structure form, center seal eccentric butterfly valve, single eccentric sealing butterfly valve, double sealing butterfly valve, triple eccentric butterfly valve. According to the sealing surface material can be divided into soft sealing butterfly valve, sealing pair made of nonmetal soft materials of nonmetal soft material composition, seal hard material from metal to non-metal of soft materials, metal hard seal butterfly valve. Seal hard material from metal to metal hard material. According to the seal form can be divided into mandatory sealing butterfly valve, pressurized sealing butterfly valve, automatic sealing butterfly valve. Elastic sealing butterfly valve is sealed pressure by closing valve plate extrusion valve seat, valve seat or valve plate elasticity, plus torque seal butterfly valve. Sealing pressure produced by plus on the valve shaft torque. Pressurized sealing butterfly valve is sealing pressure by seat or play a seal on the valve plate element pressurized. Automatic sealing butterfly valve is sealed pressure produced by medium pressure automatically. According to the working pressure can be divided into the vacuum butterfly valve, low pressure, medium pressure butterfly valve, butterfly valve, high-pressure ultra-high pressure butterfly valve. Vacuum pressure is lower than the standard heap of air through the valve operation of butterfly valves; 6 mpa butterfly valve; 5 - - 4 mpa butterfly valve; High pressure butterfly valve nominal pressure of the PN to 10. 0 - - 0 mpa butterfly valve; Ultra-high pressure butterfly valve nominal pressure PN > 100 mpa.