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Doesn't matter.
A centrifugal "stalls" because the pressure in the outlet is at the highest it is capable of. The pressure is still there, but, whereas, a centrifugal can slip, it will hold the pressure, and when you bleed off a little, it rebuilds.
A piston pump will stall by coming to a stop, period, maintaining the pressure, and when you bleed off a little, will advance to its stall point.
The efficiency of the centrifugals you guys are talking about is low, so naturally the pressure developed and held is low. But, it IS there.
Why you cannot understand this is beyond me.
Cheers,
George
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