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Gaggia Classic with Invensys pump. How measure OPV adjustment?

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Discussions > Espresso > Espresso Mods > Gaggia Classic...

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Dilrods
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Joined: 2 Oct 2008
Posts: 8
Location: SF
Expertise: I like coffee

Espresso: Gaggia Classic
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Posted Sun Oct 12, 2008, 6:50pm Subject: Gaggia Classic with Invensys pump. How measure OPV adjustment?

...searched everywhere and can't find a chart. Anyone know what sort of bypass flow (using a backflush disk) that I should get if I've properly adjusted the OPV to around 9 bar? I think it's at 50ml/30 sec right now ... TIA D

The_Shadow
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Joined: 18 Oct 2007
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Espresso: KA Pro Line
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Posted Mon Oct 13, 2008, 5:41am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

There was a thread on CoffeeSnobs regarding this. Most people say not to do it this way and use a pressure gauge instead. There's a woman on the Gaggia Group at Yahoo that will let you borrow a nice pressure gauge for your Gaggia and you only have to pay shipping. Later!

Posted Mon Oct 13, 2008, 6:48am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

Sounds good. Thanks.

Posted Mon Oct 13, 2008, 8:53am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

Yeah I forgot to mention that her name is Susan. That is a great group to join for all Gaggia users. Later!

Gime2much
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Joined: 10 Dec 2004
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Espresso: La Pavoni, Astoria comm, 2...
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Posted Mon Oct 13, 2008, 8:54am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

The_Shadow Said: There's a woman on the Gaggia Group at Yahoo that will let you borrow a nice pressure gauge for your Gaggia and you only have to pay shipping. Later! Posted October 13, 2008 link The ladys name is Susan and there is a deposit required, understandably so.

Dan Brewer

Posted Mon Oct 13, 2008, 10:15am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

Although, doesn't it seem like there'd be a pretty consistent number floating around out there? i.e. those that have the invensys pump that have calibrated to 9.5 bar (or so..) using an actual pressure gauge end up with bypass flow rates of approximately "x"? Is there that much variation between individual pumps of the same make and model?

Posted Mon Oct 13, 2008, 10:20am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

I agree, but most people won't give you much info saying it's better to use a pressure gauge. But do a search for CoffeeSnobs and there is a topic in an area called "Midpriced $500-$1500" (or something like that) regarding a Gaggia Classic pressure adjustment and they may have what you're looking for. I'd post a link if I knew how. Not much of a computer geek as I'd rather be doing other things with my time. Later!

rob_s
Senior Member

Joined: 6 Sep 2008
Posts: 9
Location: UK
Expertise: Just starting

Posted Mon Oct 13, 2008, 10:56am Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

Dilrods, here you have Invensis' website pag for coffee machines' pumps: Click Here (www.invensyscontrolseurope.com) According to the web page your pump model should be either CP1, CP2, CP3 or CP4 (or an older model not featured in the page). You'll find the specs in a PDF in the same page. There are no flow vs pressure curves, all you'll find are things like that the CP3A model pumps 100 cc/minute minimum at 10 bars. The_Shadow, I believe these are the links: How to mod the OPV: http://coffeesnobs.com.au/YaBB.pl?num=1175171794/0 Aternative way of measuring the flow (go to reply #17): http://coffeesnobs.com.au/YaBB.pl?num=1143118905/17

rob_s
Senior Member

Joined: 6 Sep 2008
Posts: 9
Location: UK
Expertise: Just starting

Posted Mon Oct 13, 2008, 2:26pm Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

A bit more research has produced this chart: Click Here (lh3.ggpht.com) (The green line shows the Invensys CP3A) from this topic at coffeesnobs.com.au: http://coffeesnobs.com.au/YaBB.pl?action=search2 When looking at the pressure charts there's something that I can't work out... According to the charts, the higher the pressure the lower the flow rate, shouldn't it be the opposite? What am I missing?

Posted Tue Oct 14, 2008, 3:19am
Subject: Re: Gaggia Classic with Invensys pump. How measure OPV adjustment?

rob_s Said:

A bit more research has produced this chart:

Click Here (lh3.ggpht.com)
(The green line shows the Invensys CP3A)

from this topic at coffeesnobs.com.au:

http://coffeesnobs.com.au/YaBB.pl?action=search2

When looking at the pressure charts there's something that I can't work out... According to the charts, the higher the pressure the lower the flow rate, shouldn't it be the opposite? What am I missing?

Posted October 13, 2008 link

If a vibe pump is similar to what's on a pressure washer then no. On my pressure washer the higher the pressure you have the lower the flow. The nozzle can either have a smaller orifice for greater pressure and less flow or a larger orifice for more flow and less pressure. Kind of hard to have both. Later!

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