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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Today's Featured Article - The Niagra View Mobile - Powered by a 1959 Ford Tractor - by Mark Massey. In 1959 the Niagara Frontier Transit Inc. of Buffalo, New York designed and built six Viewmobiles for the Niagara Frontier Sightseeing Inc. for use as a sightseeing ride at the Niagara Falls State Park, Niagara Falls, New York, powered by a 1959 Ford 611 Tractor.
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