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How to count the flow rate on centrifugal pump characteristic curve measuring test?

By changing the centrifugal pump outlet valve opening, reading the five parameters of inlet and outlet pressure, flow, speed and shaft power (electrical power) of centrifugal pumps, and then get the performance parameters after calculation, describe these parameters in the coordinate paper get a centrifugal pump characteristic curve; Fixed centrifugal pump outlet valve opening constant, changing the frequency of the motor with the inverter, measure the pump head and flow, get the pipeline characteristic curve.
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