On 01/10/2012 19:57, MarkG wrote:


Well it states a maximum "static" pressure of 10bar and a maximumk
"flow" pressure of 5 bar.

What's the difference? - please no wise asses saying 5 bar :-)

Are you asking why static and flow pressure are different, or why this
device has different limits for the two? Someone else has addressed the
second possibility, so I will address the first.

Static pressure is what you get when there is no flow, so the full
pressure generated by the pump - or whatever is driving it - is seen at
the point of application. Flow pressure is what you get when liquid is
flowing, and is lower than static pressure because some of the pressure
is lost along the way, overcoming flow resistance.

The electrical analogy is to consider the difference of measuring first
the Open Circuit voltage at a point in an electrical circuit, and then
the voltage when current is flowing. The second measurement is lower due
to the internal resistance of the power supply and the resistance of the
cables etc.
--
Cheers,
Roger
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