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Group Pressure Gauge Mod Question
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uziduzit
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uziduzit
Joined: 15 Oct 2012
Posts: 22
Location: Brockton
Expertise: I like coffee

Posted Thu Nov 7, 2013, 1:33pm
Subject: Group Pressure Gauge Mod Question
 

I recently purchased a La Vittoria Valentina and really love this machine its built like a tank but precise enough to pull great shots.  Only drawback (aside from being a vibe pump design) is it does not have a group pressure gauge. Since I always look at brew pressure every time I pull a shot, not having one is a deal breaker for me.  Since I really like this machine I would really like to keep it.  I already purchased a factory pump pressure gauge that matches the boiler pressure gauge already installed on this machine. I'm looking for the best place to tap into the machine to get the most accurate reading and minimal needle bounce.  The setup seems similar to my old Quickmill Andreja, where it has an OPV valve in line right before the tubing goes into the heat exchanger.  Theres also an additional OPV valve right at the ulka pump, similar to Rancilio Sylvia type design. Heres some pics.

http://imageshack.us/a/img594/6148/oxbi.jpg
http://imageshack.us/a/img191/7835/k7zb.jpg
http://imageshack.us/a/img268/875/uqy1.JPG

This is where I was thinking of cutting in, not sure if thats a good place.

uziduzit: IMG_1747b.jpg
(Click for larger image)
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,675
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Thu Nov 7, 2013, 2:52pm
Subject: Re: Group Pressure Gauge Mod Question
 

Mod note: moved to mods and restorations.





If that is after the pressure regulation system, it would likely be OK, my PERSONAL preference would be in the line to the brew group, cut the line and and install a T fitting. YMMV!

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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jonr
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Joined: 25 Jun 2013
Posts: 290
Location: Americas
Expertise: I like coffee
Posted Thu Nov 7, 2013, 5:53pm
Subject: Re: Group Pressure Gauge Mod Question
 

Note that an OPV reduces pressure by increasing flow and thereby decreasing pressure from the pump.  So the pressure before and after it are roughly the same.
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uziduzit
Senior Member
uziduzit
Joined: 15 Oct 2012
Posts: 22
Location: Brockton
Expertise: I like coffee

Posted Thu Nov 7, 2013, 6:12pm
Subject: Re: Group Pressure Gauge Mod Question
 

The place shown is after the regulator and it essentially would be like adding a T fitting.
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