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Gaggia Classic - water returns into reservoir after OPV setting
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Discussions > Espresso > Machines > Gaggia Classic -...  
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andreafelix
Senior Member


Joined: 21 Feb 2014
Posts: 13
Location: Italy, Milan
Expertise: Just starting

Espresso: Gaggia Classic OPV mod
Grinder: Eureka Mignon
Posted Thu May 8, 2014, 11:48pm
Subject: Gaggia Classic - water returns into reservoir after OPV setting
 

Hi, I bought a Gaggia Classic a couple of months ago and after a while also the grinder (eureka mignon). I replaced the pressurized pf and a few days ago I adjusted the OPV pressure (static) from12 to 10. After this operation I started hearing the classical leaking sound when brewing or backflushing. I noticed that water comes back into the reservoir... what does that mean? How can I fix it?

Thanks!

Ciao
Andrea
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri May 9, 2014, 9:14am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

The pump is about 15 bar capable and the OPV now opens when there is more pressure than the 10 that you set as a limit.  Your puck with grind, tamp, and amount of coffee greatly determine the pressure up to the limit set by the OPV.  It sounds like the Valve is working properly as the OPV function is to limit pressure by sending water to the tank when it is Over Pressure (OPV) and letting the puck see a constant 10 bar.  

You did not mention how the espresso was.  What is the espresso weight in the cup?  How is the taste?  Did it change?

Hope that is helpful and adequate :)

 
D4F also at
http://www.gaggiausersgroup.com/
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SJM
Senior Member


Joined: 17 Nov 2004
Posts: 1,707
Location: CA
Expertise: I love coffee

Espresso: SAMA, Gaggia Classic
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
Drip: no like
Roaster: HotTop
Posted Fri May 9, 2014, 9:21am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

andreafelix Said:

Hi, I bought a Gaggia Classic a couple of months ago and after a while also the grinder (eureka mignon). I replaced the pressurized pf and a few days ago I adjusted the OPV pressure (static) from12 to 10. After this operation I started hearing the classical leaking sound when brewing or backflushing. I noticed that water comes back into the reservoir... what does that mean? How can I fix it?

Thanks!

Ciao
Andrea

Posted May 8, 2014 link

That's exactly what is supposed to happen.
Nothing to fix.
You set the pressure lower, so water being delivered at over that pressure is diverted back.
Good job.
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andreafelix
Senior Member


Joined: 21 Feb 2014
Posts: 13
Location: Italy, Milan
Expertise: Just starting

Espresso: Gaggia Classic OPV mod
Grinder: Eureka Mignon
Posted Fri May 9, 2014, 9:45am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

D4F Said:

The pump is about 15 bar capable and the OPV now opens when there is more pressure than the 10 that you set as a limit.  Your puck with grind, tamp, and amount of coffee greatly determine the pressure up to the limit set by the OPV.  It sounds like the Valve is working properly as the OPV function is to limit pressure by sending water to the tank when it is Over Pressure (OPV) and letting the puck see a constant 10 bar.  

You did not mention how the espresso was.  What is the espresso weight in the cup?  How is the taste?  Did it change?

Hope that is helpful and adequate :)

Posted May 9, 2014 link

Hi D4F! It's nice to meet you again! You already helped me in this thread http://coffeegeek.com/forums/espresso/machines/661322?Page=1
The response is great and makes me happy because I was afraid I damaged something with the mod.

The coffee was not bad, I'm still at the beginning, I'm trying different blends from some local roasters and playing with the grinders (that I bought a few weeks ago). So basically I'm still in the phase to measure how long the coffee takes to properly fill the cup. I tried also to weigh the output, but I'm not paying big attention to that for the moment.

One question: what happen if I backflush with a chemical detergent (like Cafiza)? Will the detergent go through the soft tube also in the water tank? Is it a problem?

thanks again for your big help

cheers
Andrea
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andreafelix
Senior Member


Joined: 21 Feb 2014
Posts: 13
Location: Italy, Milan
Expertise: Just starting

Espresso: Gaggia Classic OPV mod
Grinder: Eureka Mignon
Posted Fri May 9, 2014, 9:51am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

SJM Said:

That's exactly what is supposed to happen.
Nothing to fix.
You set the pressure lower, so water being delivered at over that pressure is diverted back.
Good job.

Posted May 9, 2014 link

Hi SJM, that's really a relief to me. I didn't know this was the regular behaviour, since before the mod I didn't hear any leaking sound I thought to have damaged something...

I'm really grateful for your clarification!

ciao,
Andrea
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri May 9, 2014, 10:04am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

Yes, I remember you and the previous thread.  Good to hear again.

Backflush means chemicals in a blind basket and they will be picked up through the group and out to the drip tray, not into the boiler or reservoir, not through or connected to the OPV.  The OPV controls pressure as noted, and the 3 way solenoid controls flow direction.  Backflush machines with 3 way like the Classic, and no backflush if no 3 way.

 
D4F also at
http://www.gaggiausersgroup.com/
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,981
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Fri May 9, 2014, 10:06am
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

A little helpful reading :)

http://www.frcndigital.com/coffee/3way/intro.html

 
D4F also at
http://www.gaggiausersgroup.com/
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andreafelix
Senior Member


Joined: 21 Feb 2014
Posts: 13
Location: Italy, Milan
Expertise: Just starting

Espresso: Gaggia Classic OPV mod
Grinder: Eureka Mignon
Posted Fri May 9, 2014, 3:45pm
Subject: Re: Gaggia Classic - water returns into reservoir after OPV setting
 

D4F Said:

A little helpful reading :)

http://www.frcndigital.com/coffee/3way/intro.html

Posted May 9, 2014 link

Really interesting! Thanks a lot :-)

Ciao
Andrea
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