Thank you ferdb. That was what I expected to be the answer, although you describe it much more clearly!
I guess the operative question is "Why is the Laing pump so noisy in comparison to other pumps?" Is it doing a trade-off of noise versus efficiency that other pumps don't? Or is it made with cheaper tolerances so that the vibration from torque on/off is less damped (i.e. accumulating the energy from torque accel over time to deliver a rapid impulse when the slop factor is reached)?
The reason for asking is to see what the probability is for the pump mfg to produce a decent (still high head and low temperature) pump that is quieter if a bit more money is thrown into production costs or if we are experiencing a natural consequence of the required performance. You get what you pay for, but you can't pay to remove the laws of physics.
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