The classification of the pneumatic butterfly valve

Pneumatic butterfly valve classification based on seal according to structure form, according to the sealing surface material, according to form, according to the working pressure. Points in the form of the structure can be divided into the center seal eccentric butterfly valve, single eccentric sealing butterfly valve, double sealing butterfly valve, triple eccentric butterfly valve. According to the sealing surface material divided into soft sealing butterfly valve, metal hard seal butterfly valve. Soft sealing butterfly valve seal made of nonmetal soft materials of nonmetal soft materials, also can be made of hard metal materials of nonmetal 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 sealing pressure than by closing valve plate extrusion valve seat, valve seat or valve plate elasticity, plus torque sealing butterfly valve, sealing pressure produced by plus on the valve shaft torque; Pressurized sealing butterfly valve sealing pressure than the seat or charging - play a seal on the valve plate element. Automatic sealing butterfly valve sealing 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 valve operation is lower than the standard atmosphere of butterfly valve; Butterfly valve nominal pressure PN100MPa butterfly valve.