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Unread 01-10-2003, 08:49 PM   #10
winewood
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Join Date: Nov 2002
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Bill recommended (THIS) site to me. I think it says what joemac and I are thinking.

It is by "myv65 (Dave Smith)" and I believe this is the best article I have read on pumps and flow rates. It measures temperature as well. Look at the 3rd graphic.

Basically the pump is pulling water into itself faster that water is provided. Therefore there is a change of pressure in the loop.
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