Because of the centrifugal pump starts, the pump outlet pipe is not water, so there is no pipeline resistance and improve the high resistance, the pump starts, the pump head is low, the flow is very large, then the pump motor (shaft power) Large output (according to the pump performance curve), it is easy to overload, it will damage the pump motor and wiring, so start the export valve to close, in order to make the pump run normally.
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