We have a system with a centrifugal pump with only one speed which means one H-Q curve . Now the system flow rate needs changes in 3 modes . I=mode 1 it needs Q=10 m3/h and H= 3 bars , mode 2 it needs Q=15 m3/h and H= 3.2 bars , mode 3 it needs Q = 20m3/h and Q=3.4 bars .. WE will install a control valve with three different openings to achieve the 3 different modes by changing pressure drop so moves the system curve,, but does a pump will be capable of producing this different heads and flows at every valve position ? How things goes in such a situation and how to deal with CV and pump suppliers
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