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As a new generation of speed control valve, the valve to change from the traditional design ideas on mechanical transmission to complete the switching speed change disc mode, according to the different position of butterfly plate movement characteristics, a new design is made from electric drive control. This series of butterfly valve electric device to change the input current frequency, rotation speed and output torque and then adjust the electric device, in order to control the switching speed of the disc, the disc to achieve fast closing and slow off the two stage closed or slow opening, fast opening stage to open two. And liquid control butterfly valve has the same function

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