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Wafer butterfly advantages and classification

Author： Published：2013-12-23

Common butterfly valve wafer type butterfly valve and flange type butterfly valve two kinds. Wafer type butterfly valve with stud connection between two pipe flanges , flanged butterfly valve is a valve with a flange with bolt flanged ends of the valve on the pipe flange. Sulfuric acid used in the gas pipeline industry : blast furnace blower entrances, Relay fan entrances, electric defogging series and Unicom valve , S02 main blower entrances converter regulator , such as adjusting the preheater entrance and off the gas used. For sulfuric acid system burning sulfur , transformation, drying and absorption section is sulfuric acid plant with a valve preferred brand , the majority of users considered : good sealing performance, easy operation light and vice corrosion , high temperature operation, flexible , safe and reliable butterfly , got a lot to promote the use . Also widely used : chemical, petrochemical , metallurgy, medicine, food and other industries in SO2, steam, air , gas , ammonia , CO2 gas , oil , water, salt , lye, water , nitric acid, hydrochloric acid , sulfuric acid, phosphoric acid pipeline and other media used as a regulation and closure devices. 1 . Classification by structure (1 ) center sealing butterfly valve ( 2 ) single eccentric sealing butterfly valve ( 3 ) double eccentric butterfly valve seal ( 4 ) three eccentric sealing butterfly valve 2 . According to the sealing surface material classification ( 1 ) soft sealing butterfly valve. 1 ) Sealing materials from non-metallic soft soft non-metallic material . 2 ) by a sealing material for non-metallic rigid metal soft material. ( 2 ) metal seal butterfly valve. Sealing materials from metal to metal hard rigid material. 3 . Seal type classification according to (1 ) the mandatory sealing butterfly valve 1 ) elastic sealing butterfly valve. Sealing pressure when the valve is closed by the valve plate extrusion resilient seat , seat or valve plate production. 2 ) applied torque seal butterfly valve . Sealing pressure generated by the applied torque on the valve shaft. ( 2 ) pressurized sealing butterfly valve . Sealing pressure seal or valve seat by a bomb pieces of board member filling pressure generated . ( 3 ) self-sealing valve . Sealing pressure generated automatically by media pressure . 4 . Classified by job stress (1 ) vacuum valve . Standard atmospheric pressure is lower than the heap working calendar butterfly . ( 2 ) low-pressure valve . Nominal pressure PN <1.6MPa butterfly . ( 3 ) the pressure valve . Nominal pressure PN is 2.5 - 6.4MPa butterfly . ( 4 ) high-pressure valve . , PN is 10 0 -. 80.0MPa butterfly . ( 5 ) high pressure valve . Nominal pressure PN> 100MPa butterfly .