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Gaggia pressure problem and subsequent fix
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chasemonster
Senior Member
chasemonster
Joined: 3 Jun 2010
Posts: 364
Location: Chicago
Expertise: I love coffee

Espresso: Rancilio Audrey
Grinder: Hario Mini Mill
Drip: V60
Posted Wed May 18, 2011, 1:47pm
Subject: Re: Gaggia pressure problem and subsequent fix
 

Thank you for your reply. I am very interested in this particular quote of yours from that thread of yours:  

Frost Said:

Thanks Jim for taking the time to give this a try. I would be interested in how it works out after you pull a few shots. I've been running my Venus on the fixed resistor for 5-6 weeks now and, using the pressure gauge to monitor my shots, I've been very pleased with the simple solution to pressure control. I hope your words of encouragement will help others give it a try. I don't think there are many machines out there using this method of pressure control right now. I think it is simpler, more forgiving,  and easier to implement than using the OPV. (at least for those machines that don't provide a usable OPV for pressure regulation)

Posted October 8, 2007 link


Could you please tell me what parts I would need so that I could:
1: Read the pressure as the shot is being pulled
2: Adjust the pressure as the shot is being pulled

-for a Silvia V1?

I am only interest to monitor the pressure and adjust the pressure down to 9 bars. No pre-infusion unless it is at 9 bars.
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Frost
Senior Member
Frost
Joined: 26 Jul 2007
Posts: 2,095
Location: Sierra
Expertise: I love coffee

Espresso: Isomac Venus
Grinder: Lelit PL53
Roaster: Poppery I w/variac, MET, BT
Posted Thu May 19, 2011, 8:52am
Subject: Re: Gaggia pressure problem and subsequent fix
 

To set brew pressure use a portafilter pressure gauge. The same used in adjusting the OPV.   To set for actual brew flow pressure, you need a needle valve or such to match shot flow rate.  You will see this setup in many threads on the subject.

If you want to adjust brew pressure during the shot, you need to have a pressure gauge in the machine, and some means to adjust voltage to the pump within  the desired range.  ie; a variac, variable resistor, speed controller etc.  I have not done any of this. I have a fixed resistor on the Venus pump and fine tune pressure with the OPV. 8.5-9 bar is where I have it after a few years moving around.
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chasemonster
Senior Member
chasemonster
Joined: 3 Jun 2010
Posts: 364
Location: Chicago
Expertise: I love coffee

Espresso: Rancilio Audrey
Grinder: Hario Mini Mill
Drip: V60
Posted Thu May 19, 2011, 9:25am
Subject: Re: Gaggia pressure problem and subsequent fix
 

I think I am going to go with the needle valve and pressure gauge install on my machine.  
Really appreciate your very helpful and informative answer. That is a lot of information presented very concisely. :)
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