On 9 Mar 2005 01:32:24 GMT, Ignoramus2605
vaguely proposed a theory
.......and in reply I say!:

remove ns from my header address to reply via email

When the pump os not able to move water, it gets hot. The bypass valve
allows water back into the inlet, or in some cases blows it off to
air, so there is flow. This also drops the pressure.

Bob, I am thoroughly confused as to just what the bypass valve is
supposed to be doing. What is its job?

i