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Butterfly valves can be divided into offset plate type, vertical plate type, inclined plate type and lever type according to the structure. According to the sealing form, it can be divided into soft sealing type and hard sealing type. The soft seal type generally adopts rubber ring seal, and the hard seal type usually adopts metal ring seal. According to the connection type, it can be divided into flange connection and wafer connection; According to the transmission mode, it can be divided into manual, gear transmission, pneumatic, hydraulic and electric. Troubleshooting of daily butterfly valve.