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Can the pump pressure on the Isomac Venus be adjusted?
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Columbo
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Columbo
Joined: 24 Oct 2003
Posts: 35
Location: Lancaster, Ohio
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Rocky SS Doserless
Vac Pot: Silex Anyheet
Drip: DeLonghi 24/7
Roaster: Maybe Some Day...
Posted Fri Dec 26, 2003, 7:57pm
Subject: Can the pump pressure on the Isomac Venus be adjusted?
 

I have an Isomac Venus and I am very happy with it. I have noticed that the pressure gauge reads 13 to 14 bar when pouring a shot, though. Others have stated that anything above 9 bar is bad for the shot. While I have been perfectly happy with my results with the machine set up as is, I would like to know if I can set it to the proper range. Can anyone help me out here? Thanks.

Cordially,

Dave
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jim_schulman
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jim_schulman
Joined: 19 Dec 2001
Posts: 3,772
Location: Chicago
Expertise: I live coffee
Posted Fri Dec 26, 2003, 9:29pm
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

I think so, it has a relief valve shown in the diagram (it's on the same Tee as the steam arm) that should be adjustable. Check with you vendors service department for instructions.

jim_schulman: vennre_diag.jpg
(Click for larger image)

 
Jim Schulman
www.coffeecuppers.com
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Columbo
Senior Member
Columbo
Joined: 24 Oct 2003
Posts: 35
Location: Lancaster, Ohio
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Rocky SS Doserless
Vac Pot: Silex Anyheet
Drip: DeLonghi 24/7
Roaster: Maybe Some Day...
Posted Fri Dec 26, 2003, 9:51pm
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

Thanks, Jim. I'll check that out.

Cordially,

Dave
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Columbo
Senior Member
Columbo
Joined: 24 Oct 2003
Posts: 35
Location: Lancaster, Ohio
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Rocky SS Doserless
Vac Pot: Silex Anyheet
Drip: DeLonghi 24/7
Roaster: Maybe Some Day...
Posted Thu Jan 22, 2004, 9:50am
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

Jim,

I just want to let you, and any future readers, know that the Venus is, indeed, adjustable for pressure relief, as you advised. It was a very easy adjustment and makes a difference in the taste of the espresso. A few turns of a wrench on a nut during a pour, while a friend watched the built in pressure gauge, and it was done. My machine's pressure is now set at 9.5 bar during a pour. There is less bitterness and far less sour flavor. Overall, the result is a smoother and more pleasing shot with more bean flavor. I can taste more of the roast, if that makes any sense. I doubted that I could tell any difference, but I can. Thanks for your input and encouragement.

Cordially,

Dave
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rocket15
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Joined: 8 Nov 2003
Posts: 87
Location: Waterford, MI
Expertise: I love coffee

Espresso: Bezzera BZ02S
Grinder: rocky
Vac Pot: Infuze/Cory/Silex/GE
Drip: chemex/melitta pourover
Roaster: stir crazy/convection oven
Posted Thu Jan 22, 2004, 10:16am
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

Hi Dave, on Jim S's blowup parts list, what is the part number you applied to the wrench and turns to?
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Columbo
Senior Member
Columbo
Joined: 24 Oct 2003
Posts: 35
Location: Lancaster, Ohio
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Rocky SS Doserless
Vac Pot: Silex Anyheet
Drip: DeLonghi 24/7
Roaster: Maybe Some Day...
Posted Thu Jan 22, 2004, 12:00pm
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

I can't enlarge the diagram for some reason, but I'll try to explain. Right on top of the unit are the two soft plastic tubes that are inserted into the water reservoir. The nut is connected inline to the metal receptacle that the soft plastic exhaust tube, the one without the water softener module, is connected.  It looks like it might be used to hold the tube onto the metal receptacle, but it isn't. It is the only nut that you will see, so it's easy to find. A counterclockwise turn reduces the pressure, if I remember correctly. I hope that this helps.

Cordially,

Dave
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cafewest_tech
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Joined: 22 Aug 2003
Posts: 270
Location: Medford
Expertise: Professional

Posted Sat Jan 24, 2004, 8:26am
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

Yes, but not the machine.  You need to change your grind setting on your coffee or use  less tamp pressure.  Don't change the pressure settings on the machine.  If you have high brew pressures then your ground  coffee is to fine in the portafilter, or you are using to much tamp pressure.  Change one of those and see if your pressure goes down.
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stinkyjones
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stinkyjones
Joined: 11 Jan 2004
Posts: 836
Location: Chicago
Expertise: I love coffee

Espresso: Wega Atlas EVD 1GR (Black)
Grinder: Mazzer Super Jolly (Orange)
Roaster: New!: GG/SC
Posted Sat Jan 24, 2004, 9:33am
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

I just did this--took <5 min.  I was getting good espresso before, but my shots ran a little fast unless i packed it really tight, and I was getting "pits" in my puck from the pressure.   It takes a couple of full turns to get it from 14+ down to 9.5.  The nut takes a 10mm wrench, and on my machine was directly under the clip that connects the green wire to the boiler.

Regards,
Scott

 
The pillars of inspiration are all falling down.
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gallerydriver
Senior Member
gallerydriver
Joined: 9 Mar 2004
Posts: 3
Location: Albany, NY
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Solis Maestro Plus
Drip: Chemex
Roaster: Fresh Roast
Posted Wed Jun 2, 2004, 6:08pm
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

I just got my Isomac Venus back from a repair.  Before the repair, I was pulling great shots at 11 bar (about 25-27 seconds a pull).  Since the repair, my shots are coming out at a blazing 10 seconds. I tried adjusting the grind but I'm nowhere near the 25 second shots I was getting before. No amount of tamping seems to slow the shot.

There are lots of threads discussing the proper pressure. For example:
Pressure setting on Isomacs. Anyone at 11 bar?

Short of following the suggestions for adjusting the pressure in the thread above, is there anything else I should be considering?
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gallerydriver
Senior Member
gallerydriver
Joined: 9 Mar 2004
Posts: 3
Location: Albany, NY
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Solis Maestro Plus
Drip: Chemex
Roaster: Fresh Roast
Posted Thu Jun 3, 2004, 7:01am
Subject: Re: Can the pump pressure on the Isomac Venus be adjusted?
 

Ah-ha!  I tried a couple more shots this morning, and noticed the pressure was at 14 bars during a pull!!!  I adjusted the pressure back down to 11 bars, and the machine is once again producing great shots.

It seems odd that I would get the machice back from a repair with the pressure set so high.
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