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Could E61 head release residual water over the puck?
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danutco
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danutco
Joined: 15 Dec 2012
Posts: 7
Location: Brasov, Romania

Posted Sat Dec 15, 2012, 6:30am
Subject: Could E61 head release residual water over the puck?
 

the Bezzera Magica is quite new - 2 months; and it is used moderately with 4-5 doubles/day;
it happened from the beginning:
at the very moment of unlocking the portafilter - be it a few seconds after extraction, or ten minutes after - there is a small amount of water dropping from the drain valve and a small patch of water over the puck; immediately after the PF is unlocked, this patch of water is absorbed into the puck, as it was dropped there just before;
the puck consistency seems ok, not muddy and it is easily dropped into knockbox, rather dry on the bottom;

the water dropping from the drain valve seems to happen on other E61's too - I wonder why as the drain valve is open since closing the brew valve?
it appears that the 9 bar pressure release, does not eliminate all the water inside, and the residuals drop down released by the outside pressure equalisation when PF is unlocked;
leaving the portafilter into the group for as long as it would be, does not cure at all the problem: there will always be a small patch of water on the puck surface immediately after unlocking the portafilter;
could this be caused by a hardware problem in E61, such as adjustmens/gaskets/etc?
many thanks for any clue,
radu
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jwoodyu
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Joined: 31 Dec 2010
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Location: Michigan
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Espresso: Allex Duetto II
Grinder: Mazzer Major
Posted Sat Dec 15, 2012, 6:45am
Subject: Re: Could E61 head release residual water over the puck?
 

Puckology - don't do it  ;0) has been the common advise offered on the board.

I find similar results and always have with my Duetto regarding the dampness on top of the puck. I have not noticed additional evacuation the valve but i will look on my next cup.

 
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frcn
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frcn
Joined: 23 Dec 2001
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Location: Northern California
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Espresso: Vibiemme Domobar Double
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Posted Sat Dec 15, 2012, 8:57am
Subject: Re: Could E61 head release residual water over the puck?
 

I can't say that it happens on all E-61's but it has on both I have owned. They both tend to leave a puck a bit more soupy than other machines.
"Ignore the puck. Drink the coffee. Be happy."

Now, if you like to eat the puck and throw out the coffee, then contact your seller.   ;-)

 
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erik82
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Joined: 22 Oct 2012
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Espresso: Olympia Cremina 2013
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Posted Mon Dec 17, 2012, 3:26am
Subject: Re: Could E61 head release residual water over the puck?
 

I have noticed the same behaviour with my E-61. Would also like to get a technical answer about this. Sometimes my puck is dry but most of the time this happens with overdosing. Seems te be a very small window of dosing where the puck comes out dry (around 1-2mm headspace). Below or above this the same happens here.
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danutco
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danutco
Joined: 15 Dec 2012
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Location: Brasov, Romania

Posted Thu Dec 20, 2012, 3:43pm
Subject: Re: Could E61 head release residual water over the puck?
 

thank you for entering the thread!
yes, this is a technical (hardware) issue I am inquiring about; the quality of the coffee it not relevant in this particular case, nor the puck taste :)
moreover, I am supposing that the puck is dry after lowering the E61 lever;
only, at the very moment of unlocking the portafilter, anytime when it happens after, there is a water drop from the drain valve, as there were little vacuum inside;
and there is a patch of water on the puck surface, immediately absorbed into it as it was dropped too in the moment of the pressure equalization;

most probably I am wrong with my supposition of the puck getting wet not due to some water remains on it, but due to some water dropping onto it when the PF is released, in some marginal conditions of the E61...
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,455
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Thu Dec 20, 2012, 6:16pm
Subject: Re: Could E61 head release residual water over the puck?
 

There are possible causes of water dripping from the group after the extraction or after releasing the PF. A bad brew-valve seal could be one. Not likely after only a couple of months use. Possibly some debris in the seal such as a metal shaving from production which was missed. And lastly, if plumbed, it would be a water pressure problem on the supply line. But I only offer those possibilities as just that. Mere possibilities. A machine set with a too-high brew temperature and left to idle a long time then used without a cooling flush would be a likely error at the other end of the assembly line. Far more likely reason, though, is that it is normal for E-61 groups. In my experience, I only take notice when I get a very dry puck, and that only happens when I have delayed the removal of the portafilter for a number of minutes after the extraction.

 
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danutco
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danutco
Joined: 15 Dec 2012
Posts: 7
Location: Brasov, Romania

Posted Fri Dec 21, 2012, 3:21am
Subject: Re: Could E61 head release residual water over the puck?
 

this is the problem: if I have delayed the removal of portafilter for a number of minutes after the extraction, that patch of water will be freshly there, over the puck, as it was dropped just before, at the moment I have unlocked the PF;
and at that moment, there is a kind of pressure equalization and some water drops from the drain valve, and perhaps, over the puck?
for now I don't even understand why that residual water is kept inside the grouphead chamber, while this is open to the outside via the preinfusion and drain valve...
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