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pressure brewing bar remains 8 after pulling a shot
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Discussions > Espresso > Machines > pressure brewing...  
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kimbo5
Senior Member


Joined: 27 Aug 2013
Posts: 23
Location: ontario
Expertise: I live coffee

Posted Tue Sep 3, 2013, 4:59am
Subject: pressure brewing bar remains 8 after pulling a shot
 

Goodmorning,

I wonder if its ok for the pressure brewing bar to remain at 8 even after you have finished pulling a shot. It does not go down until you make another coffee. I thought the pressure should go back to 0 once you finished brewing?

I have a cellini v2.

thx
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 2,953
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4 x2, VDD...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Tue Sep 3, 2013, 7:44am
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

That seems odd to me.  My Duetto always drops to 0 when I stop close the brew lever.  I'm guessing your 3-way is not releasing the pressure like it should.  When did you clean your machine last?  Hopefully, all it needs is a good detergent backflush. I don't think descaling your machine will help - but I'm no expert in machine diagnostics. Otherwise, you probably will have to remove your 3-way for a thorough cleaning, or possibly even to replace it.

Just looked up your machine specs and diagrams (see Bella Barista for a thorough review).  So you have an expansion valve to release pressure to your drip tray, but that doesn't seem to be happening, right?  

It might also be important to know if you're plumbed in or operating in reservoir mode.

How old is your machine?

How long have you had it?

Is this a recent problem, you you've just decided to ask about it now?

 
.
Always remember the most important thing is what ends up in your cup!
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kimbo5
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Joined: 27 Aug 2013
Posts: 23
Location: ontario
Expertise: I live coffee

Posted Tue Sep 3, 2013, 9:33am
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

hi,

thanks for your input. i don't think it needs descaling as its a one week old machine and i also have reverse osmosis filters and water softener in the house. the firs days it was normal, the brew level was always going back to 0 after i close the lever. But the water is coming out of the 3 way normally, is just the pressure remains at 8.
have no idea why. the coffee is really good though, not bitter and perfect extraction.
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Sigma
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Joined: 2 Apr 2013
Posts: 33
Expertise: I love coffee

Posted Tue Sep 3, 2013, 3:21pm
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

I have a Rocket R58 and it does the exact same thing. Backflushing with detergent did not change anything.

Contacted my retailer, apparently most Rockets do this and they said not to worry.

Posted on Reddit, and apparently others' Rockets do the same thing. A guy with a Brewtus posted saying his did it too.

If you slightly pull up on the lever, the pressure will release.
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SStones
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SStones
Joined: 24 Nov 2012
Posts: 474
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Tue Sep 3, 2013, 3:35pm
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

This happens because when the lever is returned to the down position, the brew valve is closed. All that pressure in the heat exchanger is trapped, it's fine.  If it was very high, like 11 bars or something, then I'd suggest that you adjust your relief valve, but you're fine.
You could play with it a little, lower the control lever slowly, the pump should shut off before the valve closes off, and then you'll notice that the pressure drops away as the water escapes through your puck.  Then stops dropping off as the handle gets low enough for the valve to close.
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kimbo5
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Joined: 27 Aug 2013
Posts: 23
Location: ontario
Expertise: I live coffee

Posted Wed Sep 4, 2013, 5:34am
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

thanks. I did as suggested and it went down. it sucks though that in such an expansive machine this happens. I don't have trouble with the breville infuser at work. I found videos on you tube of all the Rockets, the brew pressure does the same thing.
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,350
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 Wed Sep 4, 2013, 7:50am
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

With E-61 machines the brew pressure gauge only will show useful information only during extraction. The gauge is connected to a closed loop (the HX circuit or the brew boiler circuit of DB machines) .  When the system is sealed (not brewing and the lever down) and is being heated, the pressure will rise.

 
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emradguy
Senior Member
emradguy
Joined: 31 Mar 2011
Posts: 2,953
Location: Houston
Expertise: I live coffee

Espresso: Duetto II; Twist v2
Grinder: M Major, Macap M4 x2, VDD...
Drip: Espro presses; Aeropress
Roaster: H-B "List of Favorites"
Posted Wed Sep 4, 2013, 8:11am
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

Ok, now you're confusing me Randy. My Duetto brew pressure gauge reads 0, except when I'm either brewing or back flushing.

 
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Always remember the most important thing is what ends up in your cup!
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SStones
Senior Member
SStones
Joined: 24 Nov 2012
Posts: 474
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Wed Sep 4, 2013, 8:47pm
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

kimbo5 Said:

thanks. I did as suggested and it went down. it sucks though that in such an expansive machine this happens. I don't have trouble with the breville infuser at work. I found videos on you tube of all the Rockets, the brew pressure does the same thing.

Posted September 4, 2013 link

I think you're misunderstanding something, or I'm misunderstanding you...  Why does it suck? The gauge is reading the pressure in the lines between the pump and the heat exchanger. It seems nice to me that there's a little trapped pressure in there that is a readable reassurance...  It sits at 8 or so and you know all's well.  If it were going way up you'd know the relief valve was stuck shut, if it slowly dropped to zero with the control handle down you'd know the brew valve (Or something) was leaking. Gauges are there to provide information and it sounds like yours is doing so. That doesn't suck at all.
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frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,350
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 Wed Sep 4, 2013, 10:34pm
Subject: Re: pressure brewing bar remains 8 after pulling a shot
 

emradguy Said:

Ok, now you're confusing me Randy. My Duetto brew pressure gauge reads 0, except when I'm either brewing or back flushing.

Posted September 4, 2013 link

That was easy!   ;-)

It has been a while since I had my reservoir VBM DS, so I might be mistaken. Maybe just plumbed machine or just DB machines.

Been one of those weeks (years, really). This morning I spent three or four hours working on  one of my Hottops, changing from HTC_TC4C to RL-HT-CTRL boards and had to install a different USB panel mount cable. it was a different size so i went into my parts and found a new back panel. I carefully cut the square hole, mounted the cable, made a new plate for the board which is a different size than the old boards, and got it all together to find that the back cover is for the older machines and not for the "-2" models and there is no opening molded for the Safety eject lever....  PALM -> FOREHEAD = MY DAY

 
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