You are incorrect, throttling the output on centrifugal is a common way to control flow, but cannot be done on a positive displacement pump. The pump curve sheets will show you how much the pump can be pinched back and what the results will be. It is becoming much more common now to use a VFD. A centrifugal pump will draw maximum amps with no back pressure, and running without can burn them up if no overloads, as they run out past the curve. I do not know how the curve is on this particular pump.
In this particular case, a 14 stage centrifugal is probably a fairly tight pump and pinching may cause excess pressure, but it will still perform according to the curve it was designed for.
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