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Discussions > Espresso > Machines > Adjusting vibe...  
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MrFollies
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Joined: 3 Oct 2003
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Location: Amsterdam
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Posted Sat Apr 24, 2004, 10:04am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

jim_schulman Said:

Absolutely, taste is king. In any case, either my spring on the valve or the gauge is very non-linear, since it took a lot more turns to go from 10 to 9 than from 11 to 10 bar.

Posted April 17, 2004 link

I just adjusted my Tea and I noticed exactly the same thing.  One other thing I noticed is that a 9 reading with a blind filter equals about a 8.3 with coffee.

-D
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LurkerJohnny
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LurkerJohnny
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Posted Thu Apr 29, 2004, 2:55am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

Has anyone tried adjusting the vibe pump pressure on a Expobar? I am seriously considering this machine.  Does it even need adjusting on an Expobar? If i were to get one, I would want to aim for smoother shots.   Johnny.
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CaffeOle
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CaffeOle
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Location: Bay Area
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Posted Sat May 1, 2004, 1:23pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

Has anyone tried adjusting the vibe pump pressure on a Expobar? I am seriously considering this machine.  Does it even need adjusting on an Expobar? If i were to get one, I would want to aim for smoother shots

I adjusted both temperature and pressure on mine. I don't have a PF gauge so I used Another_Jim's technique for measuring the "run-off" back to the tank. One trick is that the flow-rate is significantly higher when the heater is off than when its on. I waited for the light to go off and adjusted the Over Pressure Valve till I got ~2 oz in 25 sec. Initially I had only 0.5 oz. Shots are definitely better.
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PJK
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Posted Sat May 1, 2004, 5:41pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

Hi Jim,

You said HX machines and high end single boiler machines.  There is a device in my Silvia which looks like a pressure limiter.  Do you know if it will lend itself to this sort of tweeking?

Thanks,

Phil

 
Philip J. Keleshian
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HB
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Joined: 3 Apr 2003
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Posted Sat May 1, 2004, 5:58pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

PJK Said:

There is a device in my Silvia which looks like a pressure limiter.  Do you know if it will lend itself to this sort of tweeking?

Posted May 1, 2004 link

Yes, see Silvia Pressure Modification (and countless posts on the same subject).

-- Dan

 
www.home-barista.com
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koffeekev
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Posted Sun May 2, 2004, 7:30am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

Dan had posed a question to me in the New Lyra owner thread that I was unable to answer regarding the 2 expansion valves on these particular machines, Lyra, Mini and CKX. I looked this system over thoroughly and came up with a question or two for Jim S.

1) water line in from direct feed or bottle to pump
2) water line in from direct feed or bottle bypassing the pump and connecting to exp. valve
3) pump connecting to exp. valve
4) expansion valve to inlet solenoid
5) solenoid to tee, one side to boiler and one side to second expansion valve
6) exp. valve to tee, one side to H2O exchanger and one side to brew exchanger
7) second exchanger has bypass hose to drip tray

The first exchanger mounted to the pump is in the correct direction to be adjusted for water flow pressure. The second one is placed in the opposite direction to regulate the pressure being fed back from the exchangers

My two questions:
What is the purpose of the John Guest hose that bypasses the pump to connect with the exp. valve? If you connect a water line to the pump with it disconnected from the machine the pressure isn't enough to open the expansion valve. On direct feed it would seem to add water to the system when the pump pushed the valve open. On a bottle feed system it might act as a vent of some sort. I'm perplexed.

Which expansion valve would be adjusted for the brew pressure? Both?

Eagerly awaiting your thoughts. Kevin
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CaffeOle
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CaffeOle
Joined: 28 Mar 2004
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Posted Sun May 2, 2004, 10:11am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

jim_schulman Said:

Vibe pumps drain 2 to 2.5 ounces of water in 25 seconds when they are at 8.5 to 9.5 bar. So put in a blind filter, use a measuring cup to catch the run off back to the tank, and adjust it to get that flow rate (wait for the pressure to max before measuring, you'll hear this in the pump going quiet as the flow stops, it'll take up to 10 seconds for preinfusing ones)

Posted April 16, 2004 link

Jim's "poor man's" technique worked pretty well for me but I would be interested to see a confirmation from an Expobar owner (with the same pump and OPV) who has a pressure gauge. Anyone out there care to give this a try? I saw a pretty big difference in "run-off" volume depending on wheter or not the heater light was on - presumably due to the current load and decrease in voltage for the pump (although I didn't confirm this with measurement). Thanks.
-B
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barjohn
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barjohn
Joined: 1 May 2004
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Location: San Clemente, CA
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Espresso: Breville Oracle
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Posted Sun May 2, 2004, 10:30am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

I tried his technique on my Expobar before I got the pressure guage.  The reading from the pressure guage was different from the measure I got from that technique.  I can't remember whether it was low or high for sure.  Sorry I can't give you more details.

John

 
John

Veritas en Trashitas
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strugs
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strugs
Joined: 21 Jul 2003
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Expertise: I live coffee

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Posted Mon May 3, 2004, 11:18pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

Question for you senior geeks:

Say I want to add a pump pressure guage, but do not want to make some sort of frankenstein portafilter, can I just add a gauge with a "T" fitting immediately after the pump?  Or should the guage be installed further down the line after the OPV valve?

 
- Sean
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coffeehabit
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coffeehabit
Joined: 11 Apr 2004
Posts: 56
Location: Israel
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Posted Tue May 4, 2004, 12:55am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

from the pump to your coffee you have the same pressure, as there are no valves in the middle to cut down the pressure and the only pressure control is the overflow valve.
hope this helps.
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