Single butterfly classification of pneumatic valve

According to the classification of structure form
( Center sealing butterfly pneumatic valve ( The single eccentric sealing butterfly pneumatic valve ( The double eccentric sealing butterfly pneumatic valve ( According to the sealing surface texture classification
( Soft seal butterfly pneumatic valve. Seal made of nonmetal soft materials of nonmetal soft materials. Seal hard material from metal to non-metal of soft materials. ( Metal hard seal butterfly pneumatic valve. Seal hard material from metal to metal hard material. According to sealing form classification
( Forced sealing butterfly elastic pneumatic valve sealing butterfly pneumatic valve. Sealing pressure than by pneumatic pneumatic valve plate extrusion pneumatic seat when the valve is closed, pneumatic seat or pneumatic valve plate elasticity. Plus torque seal butterfly pneumatic valve. Sealing pressure by plus on the pneumatic valve shaft torque. ( Pressurized sealing butterfly pneumatic valve. Sealing pressure than by pneumatic or pneumatic valve plate play a seating components pressurized. ( Automatic sealing butterfly pneumatic valve. Sealing pressure produced by medium pressure automatically. According to the working pressure classification
( Vacuum pneumatic valve adjustment. Working pressure is lower than the standard heap atmosphere through the pneumatic butterfly valve. ( Low pressure pneumatic valve adjustment. Nominal pressure PN< MPa the pneumatic butterfly valve. ( Medium voltage adjustment pneumatic valve. - - MPa the pneumatic butterfly valve. ( High pressure pneumatic valve adjustment. PN for the nominal pressure. - - MPa the pneumatic butterfly valve. ( Ultrahigh pressure regulating pneumatic valve. Nominal pressure PN> MPa the pneumatic butterfly valve. According to the working temperature classification
( High temperature butterfly pneumatic valve. t> The butterfly pneumatic valve (° c. Temperature control in the pneumatic valve. C< t< ℃ the pneumatic butterfly valve. ( Room temperature control pneumatic valve. A C< t< ； ° C the pneumatic butterfly valve. ( Butterfly pneumatic valve in low temperature. A & lt; t< A butterfly pneumatic valve ° C. ( Cryogenic butterfly pneumatic valve. t< A butterfly pneumatic valve ° C.