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Another DB Quickmill
Rocket R58 Double Boiler
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,392
Location: UK
Expertise: I love coffee

Posted Tue Jan 14, 2014, 1:42pm
Subject: Re: Another DB Quickmill
 

Tonyv138 Said:

it is there

when time comes, you pull those pin followers with the pliers and put new ones in?

Posted January 14, 2014 link

Not quite, you do it like this

http://coffeetime.wikidot.com/e61-group-servicing
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ECM
Senior Member
ECM
Joined: 11 Oct 2003
Posts: 476
Location: Halifax, Nova Scotia Canada
Expertise: I like coffee

Espresso: Quick Mill Vetrano 2B
Grinder: Mazzer Robour E
Vac Pot: French Press
Drip: no
Roaster: Fresh Roast+8,  i-roast and...
Posted Wed Jan 15, 2014, 9:37am
Subject: UE
 

Quick question for Dave?

On the advice of my vender I turned up my Expansion Valve to avoid some temperature instability I was experiencing.  It turns out the instability was easily dealt with through the PID settings by increasing my I1 from 1.5 up to 3.  Now the veteran sticks to the programmed temp much tighter.  

The fall out from the tightening of the Expansion Valve is that now when I back flush with a blind I'm reading 11-11.5 bars.  Even during a shot it will almost hit the 11 bar mark.  The espresso is tasting too bright for me.  My plan is to open up the Vetrano and loosen the Expansion Valve back a bit.  

My Question is:

If back flushing with a blind filter what should my pressure be reading?  I'm thinking probably 10 rather the 11 it is currently hitting?  In other words, during a shot I would like to see it around 9 or 9.5 at the most.  

Thanks Dave,

Rob
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,392
Location: UK
Expertise: I love coffee

Posted Wed Jan 15, 2014, 6:26pm
Subject: Re: UE
 

ECM Said:

Quick question for Dave?

On the advice of my vender I turned up my Expansion Valve to avoid some temperature instability I was experiencing.  It turns out the instability was easily dealt with through the PID settings by increasing my I1 from 1.5 up to 3.  Now the veteran sticks to the programmed temp much tighter.  

The fall out from the tightening of the Expansion Valve is that now when I back flush with a blind I'm reading 11-11.5 bars.  Even during a shot it will almost hit the 11 bar mark.  The espresso is tasting too bright for me.  My plan is to open up the Vetrano and loosen the Expansion Valve back a bit.  

My Question is:

If back flushing with a blind filter what should my pressure be reading?  I'm thinking probably 10 rather the 11 it is currently hitting?  In other words, during a shot I would like to see it around 9 or 9.5 at the most.  

Thanks Dave,

Rob

Posted January 15, 2014 link

If it's the rotary Vetrano, brew pressure should be adjusted using the adjuster on the rotary pump. The expansion valve should first be set to around 12 bar against a blind filter with the pump adjuster turned  up gradually until you see water flow out of the expansion valve vent at 12 bar. If it comes out sooner, tighten the expansion valve and carry on.

Once you done that, back off the pump adjuster, until you see 9 bar. Remember there will be a slight hesitation and then a rise as the preinfusion chamber fills, then it will sit at a pressure for a few seconds and then rise another bar or so (due to expansion of water). it's that pressure it sits at for a few seconds before maxing out that you need to be 9 bar.
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ECM
Senior Member
ECM
Joined: 11 Oct 2003
Posts: 476
Location: Halifax, Nova Scotia Canada
Expertise: I like coffee

Espresso: Quick Mill Vetrano 2B
Grinder: Mazzer Robour E
Vac Pot: French Press
Drip: no
Roaster: Fresh Roast+8,  i-roast and...
Posted Thu Jan 16, 2014, 5:15pm
Subject: Re: Another DB Quickmill
 

Thank you Dave for getting back to me.  

Yes I understand what you are saying but the only item I adjusted was the expansion valve.  I never adjusted the pump pressure.  Therefore, I assume that if I turn the expansion valve back to where it was set when I received the unit then I shouldn't need to play with the pump itself at all.  I guess my question is: what pressure should the Vetrano 2B be set at with the blind filter in place when you engage the pump?

I'm guessing around 10?  This would probably give you a pressure of 9 or 9.5 during an actual real pull using coffee?
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