The working point of the centrifugal pump is determined by the characteristic curve of the pump and the characteristic curve of the pipeline system. So, the change of the characteristic curve of any one can achieve the purpose of flow regulation.
At present, the flow regulation of the centrifugal pump is mainly controlled by the regulating valve, the variable speed control of the pump, and the pump and series regulation. Because of the principle of regulation in different ways, the resulting energy loss is not the same, in order to find the minimum energy consumption, energy saving, the highest effect is the best way of flow control, must fully understand the relationship between the flow adjustment of centrifugal pump and energy consumption.
Several main methods of regulating the flow rate of the centrifugal pump are analyzed by the characteristic curve of the centrifugal pump and the pipeline system: the adjustment of the outlet valve, the variable speed regulation of the pump and the series and parallel regulation of the pump. With the characteristic curves of the energy loss of pump outlet valve adjustment and speed adjustment in two ways, and compared it with the speed regulation, outlet valve regulating flow of traffic than you can better save energy, with centrifugal pump outlet valve: small, directly blocked the flow of liquid, but the work of the centrifugal pump energy did not decrease; if adopt variable speed control, reduce the speed of centrifugal pump, the corresponding reduction in the flow, so as to reduce the flow and energy saving.
