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Adjusting vibe pump pressure on HX machines
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Discussions > Espresso > Machines > Adjusting vibe...  
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ck72
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Joined: 15 Jun 2004
Posts: 79
Location: Melbourne, Australia
Expertise: I live coffee

Espresso: San Marino CKX
Grinder: Rocky Doserless
Posted Mon Apr 4, 2005, 3:11pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

strugs Said:

here is the pic

Posted November 21, 2004 link

just so that I am clear the two valves that need to be adusted are the ones with a large flat screw, sorry for my ignorance
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strugs
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strugs
Joined: 21 Jul 2003
Posts: 658
Location: Vancouver, Canada
Expertise: I live coffee

Espresso: Vincent Wega (Wega Lyra)
Grinder: Jules (Mazzer Mini)
Vac Pot: Hario TCA-5
Drip: Tray
Roaster: 49th and/or Intelly
Posted Mon Apr 4, 2005, 7:44pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

ck72 Said:

just so that I am clear the two valves that need to be adusted are the ones with a large flat screw, sorry for my ignorance

Posted April 4, 2005 link

Yes - the two cylindrical brass screw thingamijigs.  Make sure you have a pressure guage - that is the best advice I can give you.  Otherwise, you will royally screw things up.  Have fun.

 
- Sean
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ck72
Senior Member


Joined: 15 Jun 2004
Posts: 79
Location: Melbourne, Australia
Expertise: I live coffee

Espresso: San Marino CKX
Grinder: Rocky Doserless
Posted Mon Apr 4, 2005, 9:34pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

thanks for that I have the pressure gauge....will give it a go
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CrackAddict
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Joined: 7 Apr 2005
Posts: 8
Location: London, UK
Expertise: I love coffee

Espresso: Expobar
Grinder: Minoka
Roaster: iRoast
Posted Tue May 3, 2005, 5:57am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

A note that may help some Expobar neophytes like myself.

The pressure adjustment (in my Office Control) is a white plastic screw inside a brass three-way fitting on the outlet of the vibe pump (red plastic inside a metal holder).

It's about a 1/4" screw with a very fine slot - most screwdrivers wide enough to fit across will have a blade too thick to fit in the slot. You may want to file down a cheap stubby slot screwdriver for adjustments.

My "shipped" pressure was almost 14 bar (measured with a portafilter gauge). I have turned it down to 10 (about 1.5 turns counterclockwise) and will report on the results later.

I also followed the suggestion to reroute the overflow back to the reservoir as I live in a very hard water area and use Volvic bottled water in the machine. Supposedly Volvic is soft enough to minimize scaling problems.
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Confusedguy
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Joined: 16 Apr 2005
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Location: California
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Espresso: Gaggia Carreza
Grinder: Rancilio Rocky
Posted Tue May 3, 2005, 2:23pm
Subject: Re: Adjusting vibe pump pressure on HX machines
 

When I tried to adjust the pressure down on my Quickmill Eliane, I found I had to back the threads almost to the point where where the fitting came off. I removed the nut and spring and and filed down the end of the spring, probably less than a mm. I was then able to get the desired pressure (9.5) without risking the screw falling off. I agree that the adjustment is non-linear. Originally mine was up at about 16!
Russell
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mayong_md
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Joined: 11 Feb 2011
Posts: 25
Location: Bacolod, Philippines
Expertise: Just starting

Posted Fri Jul 6, 2012, 6:45am
Subject: Where is the OPV on a Grimac Mia ELE?
 

]]Hello. Sorry to revive an old thread.

I got to reading about brew pressures and HX machines, and found this thread.

I have a Grimac Mia Electronic version. I decided to open the machine to try the OPV volume runoff method of "estimating" brew pressure. I locked a blind PF and turned on the brew button. The pump came on, after 6-8 sec, the pump became quiet as it labored through the blind PF, the beeping - with a flashing light from the brew button. After 20-25 sec of this beeping, I decided to turn the brew button off. I did NOT see water coming out of the return to tank hose. From the readings, it was mentioned that if little (<2oz/25-30sec) or NO water comes out, then the OPV was adjusted high from the factory.

I looked for the OPV, taking note of the pics of the different OPVs of different machines. I found a pic from the La Valentina - a Grimac Machine, I believe, and used this as a guide to identifying mine. I followed the outflow tube, and the tube was attached to this:

Click Here (i756.photobucket.com)


Click Here (i756.photobucket.com)

Instead of just a barrel, several fittings are seen attached to a brass block. The outflow tubing attaches to this block as well. I don't see the nut I need to adjust to release pressure. Behind the block, in this pic, is a sort of switch. Maybe a pressure sensor that sets off the beeping when pump pressure is exceeded?

Hope you can help me identify where the OPV is in the MIA.

Thank you,
Mario
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lotusblackbox
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lotusblackbox
Joined: 7 Jul 2012
Posts: 11
Location: Sydney
Expertise: I love coffee

Posted Sat Jul 7, 2012, 8:23am
Subject: Re: Adjusting vibe pump pressure on HX machines
 

It's beginning to sound like the dream machine not only has perfect temp stability with the ability to set a desired temp but also a controled ramp down of extraction pressure.  Also with the ability to set a pressure profile.
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