HomeRoast Digest


Topic: Adjusting the Bars (5 msgs / 96 lines)
1) From: Rob Stewart
I adjusted the pump pressure lower and the gauge reflects it, but the pull
is considerately faster.  Seems it should be longer with less pressure.
What am I missing?  When I tightened the nut, per instructions to lower
pressure it goes up instead .... so I backed it out and the gauge goes down
and the pull is longer.  Doesn't make sense to me.
Rob

2) From: Simpson
I think some posts on a.c support this, and the thinking was that higher
pressure lead to a quicker migration of the fines downward in the puck with
a consequent reduction in flow rate. With lower pressure the opposite
occurs so paradoxically you get faster pours.
Andy, wherever you are, did I get that right?
Ted
*********** REPLY SEPARATOR  ***********
On 4/30/2004 at 6:07 PM Rob Stewart wrote:
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3) From: Rob Stewart
OK.... I had considered the puck was getting compressed more at higher
pressure, but not the migration of fines.    I had tightened the grind a
notch..... I'll try finer tomorrow and check out the a.c. goggle archive.
Thanks, Rob

4) From: Ed Needham
The more the pressure compacts the puck, the slower the pull.
It is literally blasting the puck with 132 PSI of pressure at 9 bar.
Water debit will remain close to the same at either pressure.
*******************************
Ed Needham
To Absurdity and Beyond!
homeroaster ... d.o.t ... com
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5) From: Dan Bollinger
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The instructions are wrong. Obviously. Keep this in mind: When you =
tighten the nut you are compressing a spring that presses on a valve =
seat.


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