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Bpk, frequency conversion and constant pressure water supply control device selects one of the world's most advanced inverter, such as: Siemens, abb, Schneider, Ken, Fuji and other brands, the control unit with dedicated inverter, PLC and general inverter and other control mode. Instantaneous pressure changes under the pipe network, the pump motor for automatic withered speed, so as to achieve the purpose of constant pressure water supply, has a great practical value and economic value.