We adjust the brew pressures before they are sent out. We put in a portafilter
with a blind filter basket and then turn on the pump. We then set the pressure
to 10 bar using the screw on the OPV. At this setting you will get about 8.5
bar pressure with a flow of 2 ounces in 25 seconds. So before you make any
adjustments to the brew pressure make sure you get your grind right.
Todd Salzman
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My screw looks like it's metal, and is located on the front of the machine,
lower right corner, once you've removed the drip tray. Sound right? I do
tamp to 30lbs. I'll use the blind PF to set the pressure, thanks for that
info!
On Wed, Jan 28, 2009 at 5:46 PM, BinBakinBeans <[email protected]>wrote:
>
> Which version of Brewtus?
> The first had a teflon screw on the opv valve that became problematic
> after adjusting the pressure.
> The first of the BII had teflon as well. They were later switched to
> an opv with a brass adjusting screw. I replaced mine with one of these
> after I had problems with my original teflon screw opv on my BII.
> Strangely enough, Expobar has again gone back to using an opv with a
> teflon screw on the new BIII machines.
> I would say go ahead and adjust it, especially if it is a brass
> screw. If it is teflon, be prepared to "possibly" have some future
> problems with it. Not a big deal to change it out if you do.
> Use the blind filter in the portafilter to get it down to about 8.5 to
> 9 on the guage.
> Check again when you actually pull a shot that it is around 8.5. I
> will assume that you will have properly tamped to about 30 pounds.
>
>
> On Jan 25, 12:27 pm, Chris Bailey <[email protected]> wrote:
> > I've seen a fair bit of talk on the list about adjusting pressure. Given
> > the fact that there's tape over the pressure adjust screw on my machine,
> and
> > all the warnings about don't touch it, only let the factory do it, etc,
> > etc., I'm leery of messing with it. Also, my understanding is that
> > supposedly the factory has pulled shots and checked the pressure and set
> it
> > properly.
> > But, I've just wondered about it. My pressure gauge typically reads
> about
> > 11 bar when I'm pulling shots. I'm unclear on whether it's supposed to
> read
> > the true 8.5-9 bar that an espresso should be done at, or whether the
> gauge
> > is a pressure at a different point in the system and thus the real
> pressure
> > at the PF is lower, or not.
> >
> > Can folks discuss this a bit? Other than taste, are there ways for me to
> > know whether my machine is set right or not, and/or if I'm going to
> adjust
> > it (and potentially void my warranty?) how can I know when I've set it to
> > the right spot? From the reading I've done I think I understand that too
> > much pressure can actually cause a build up and not get things flowing
> > properly (which seems a bit backwards, but I sort of understand).
> >
> > Anyway, let me know what folks think.
> >
> > --
> > Chris Bailey
> > [email protected]
> >
>
--
Chris Bailey
[email protected]
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