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the product was composed by wafer center line-type butterfly valve and Bernard quarter-turn actuator. Electric butterfly valve also called flap valve. It is a kind of regulating valve with simple structure. It connected with actuator, and used for controlling the switch of low pressure pipeline medium. Its mainly function is cutting-off or throttling the medium in the pipeline. the switch part is a kind of disc-shaped plate which rotate around itself axis in the butterfly valve and to achieve the on-off or regulation function. It with the feature of small start torque, large flow capacity, small flow resistance damage and flexible operation. It used for blast furnace, heating furnace and gas station in the field of metallurgy, light industry and other industry.