Author Topic: Help with 2015 Classic - pressure too high  (Read 5589 times)

Offline tdfg7583

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Help with 2015 Classic - pressure too high
« on: November 21, 2016, 05:54:16 PM »
Hi all.

I have recently bought a new Classic from Coffee Italia and have tested the pressure (gauge screwed to bottom of portafilter) and it gave me 11.5 bar. This is higher than i want for espresso with a non pressurised filter and there is no easy OPV mod, I believe.

The retailer are not interested at all, saying that what I'm saying is a lie and that they are all 15 bar which is correct! So I can't return to them for a refund, it seems.

Are Gaggia likely to be of any assistance here? I'd dearly love to get a refund and buy a different machine, but i fear I'm stuck now. Any ideas?

Thanks!

Offline D4F

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Re: Help with 2015 Classic - pressure too high
« Reply #1 on: November 21, 2016, 06:05:42 PM »
Welcome to the forum.

Gaggias, old and new use pumps claimed capable of 15 bar, and the OPV or pressure regulation or safety valves are limited at about 12 bar, so the 11.5 at the PF is probably normal.  I haven't read different for the new stainless "Classics."  They are set up to be used with ESE pod coffee and ground coffee with pressurized portafilters.

I doubt a refund is in your future, sorry. 

There are mods some of the non-adjustable pressure regulators if you search.  Not sure about your specific machine.  Jerryseabridge may come along with the answer to that.  I don't have a picture or parts diagram for your valve. Some have changed springs in the Gaggia Pure type regulators.
« Last Edit: November 21, 2016, 06:08:42 PM by D4F »

Offline tdfg7583

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Re: Help with 2015 Classic - pressure too high
« Reply #2 on: November 21, 2016, 06:21:40 PM »
Thanks for the reply. I'm fear I'm not hands-on enough to do much modification myself. If anyone knows any places in the south east UK that might be able to help me with an adjustment, I'd be hugely grateful!

Offline jerryseabridge

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Re: Help with 2015 Classic - pressure too high
« Reply #3 on: November 22, 2016, 11:19:19 AM »
In case you do decide to have a go at adjusting the OPV, or find someone with sufficient DIY skills to do it for you then see this thread:

http://www.gaggiausersgroup.com/index.php/topic,1113.msg10103.html#msg10103

It's about the OPV used in the "New Baby 06" models HOWEVER the new Classic (check you have this model, it will have the model number RI9304 on the sticker underneath) uses the same type of OPV.

To summarise the above thread, get some similar dimension springs and cut them until the desired pressure is achieved.

Jerry

Offline JojoS

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Re: Help with 2015 Classic - pressure too high
« Reply #4 on: November 26, 2016, 07:07:06 AM »


I found this in a UK based forum and the instructions were to simply ease of the 10mm nut around one full turn to achieve a 10 bar reading at the portafilter. No other adjustments.

Posted by OP in another forum and photo courtesy of Jumbo Ratty of Coffee Forums UK.
« Last Edit: November 28, 2016, 06:37:23 AM by JojoS »

Offline jerryseabridge

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Re: Help with 2015 Classic - pressure too high
« Reply #5 on: November 29, 2016, 05:00:30 AM »
Really good point, in effect the spring mechanism at the bottom of the boiler is a second pressure valve. With hindsight the pressure needs to be set lower than the OPV attached to the pump, if it were the other way round, there would never be enough pressure at the grouphead to force the water out. Therefore reducing the spring in the OPV will have no effect on this type of machine.

IIRC the thread length on the "valve hold screw" (part #24, see http://www.gaggiausersgroup.com/index.php?action=ezportal;sa=page;p=92 ) is quite long, about 15mm, so it should be simple to give it a turn and re-test without any wider issues.

Interestingly I just noticed on the parts diagram referenced above that part #23 (the spring) is rated at 5-7Bar - doesnt look like it's performing to that level...

Jerry

Offline tdfg7583

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Re: Help with 2015 Classic - pressure too high
« Reply #6 on: December 19, 2016, 12:51:26 PM »
Yes, I gave this a go around a month ago (just turning the nut until I got around 10-bar on the gauge) and it's been holding steady ever since.

So far, so good then!

Offline jerryseabridge

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Re: Help with 2015 Classic - pressure too high
« Reply #7 on: December 20, 2016, 06:37:38 AM »
Brilliant, thank you so much for updating the thread with your findings, i'm sure it'll help others in the future.

Jerry

 

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