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Opv on my Rancilio Silvia
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ila
Senior Member


Joined: 24 May 2012
Posts: 12
Location: Italy
Expertise: I love coffee

Posted Sun Oct 28, 2012, 10:25am
Subject: Opv on my Rancilio Silvia
 

Hello everyone, I have a Rancilio Silvia (year 2005) and bringing it to the service center for a check I was told that the expansion valve (OPV) is damaged. Honestly I have not repaired also because he asked me usd 150 for the repair. how do I know if it is broken? I checked with a manometer if the pressure is adjusted and seems to work for me.
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Coffeenoobie
Senior Member
Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,021
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sun Oct 28, 2012, 11:06am
Subject: Re: Opv on my Rancilio Silvia
 

My understanding is if you have a 3 way valve I believe you can see water coming out of an OPV when you back flush because you are creating an over pressure situation.  

http://www.frcndigital.com/coffee/opv.html

http://coffeetime.wikidot.com/opv-over-pressure-valve

http://www.espressoparts.com/R_1406

Click Here (www.1st-line.com)
NEWEST Feature: The overpressure valve (a.k.a. OPV) is now adjustable on our latest batch of new Silvias (started in February, 2007). The overpressure valve is normally set to 11 bar. However, if your grind is just right, the grind should only create 8-9 bar of resistance so the overpressure valve will never open.

Some customers want to change this to 8-9 bar. No coffee will come out of your grouphead if the coffee grind has a resiatance greater than the setting on the overpressure relief valve. You will need the V512 pressure gauge to asses the pressure. Please note this part is not returnable. In addition, if you break something while doing this, you will need to pay for the part and shipping. If you decide to return the machine with the broken part, we will deduct the charge for the part and labor from the credit.

You can increase the amount of excess water pressure (meaning make the valve open at less than 11 bar) by bringing out the OPV and tightening the nut against the valve (like show). Or, you can decrease the amount of excess water pressure (meaning make the valve open at more than 11 bar) by bringing the OPV into the valve after you loosen the nut next to the valve.


(note if yours is 2005 makes wonder if yours has the same OPV.)

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

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ila
Senior Member


Joined: 24 May 2012
Posts: 12
Location: Italy
Expertise: I love coffee

Posted Tue Oct 30, 2012, 7:05am
Subject: Re: Opv on my Rancilio Silvia
 

I do not know how to explain the defect, but simply silvia does good coffee. I tried to regulate and lower blood pressure monitoring with a pressure gauge (8 bar), but the result does not change. The cause of the defect was told that depends on the valve (OPV) .
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dyqik
Senior Member


Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Tue Oct 30, 2012, 9:24am
Subject: Re: Opv on my Rancilio Silvia
 

The factory setting of the OPV is often higher than 8 bar on some machines - about 12 bar is normal is the machine is set up for coffee pods.  It could be that the factory checked the pressure, found it was less than 12 bar and therefore told you the OPV was damaged.

Somewhere around 10 bar static pressure or 9 bar dynamic (i.e. with water flowing at about the right rate to brew espresso) is good, although you might prefer slightly lower.  If you see water coming out when brewing and have a static pressure of around 8-10 bar, then the OPV is working!  I guess you should also check it for leaks when running though.
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NobbyR
Senior Member
NobbyR
Joined: 10 Jul 2011
Posts: 2,039
Location: Germany
Expertise: I love coffee

Espresso: Poccino Opus One, Ariete
Grinder: Eureka Mignon Istantaneo
Vac Pot: N/A
Drip: Melitta Linea Unica de Luxe
Roaster: N/A
Posted Tue Oct 30, 2012, 9:32am
Subject: Re: Opv on my Rancilio Silvia
 

dyqik Said:

The factory setting of the OPV is often higher than 8 bar on some machines -  ...

Posted October 30, 2012 link

There seems to be good reason for that: 9 bar or 11 bar - What is the right pump pressure for the espresso machine. Don't worry about the German introduction of the video, most of it is actually in English.

 
***
"This drink of the Satan is so delicious that it would be a shame to leave it to the infidels." (Pope Clement VIII on coffee, when he was urged to ban the beverage)
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dyqik
Senior Member


Joined: 7 Oct 2011
Posts: 383
Location: Cambridge, MA
Expertise: I love coffee

Espresso: Bezzera BZ07 PM
Grinder: Baratza Virtuoso Preciso...
Vac Pot: Cona D
Drip: Bona-Vita, CCD, Aeropress.
Roaster: Gene Cafe, Modded Poppers
Posted Tue Oct 30, 2012, 12:35pm
Subject: Re: Opv on my Rancilio Silvia
 

Yeah, I know that - I said 9-10 bar in the rest of the post.  But the factory setting on Gaggia Classics, and reportedly some Silvias, is about 12-13 bar so that they can use the pods properly.  Adjusting it down to 9-10 bar would mean it differed from the factory settings, and might possibly get flagged up as out of spec, and reported as such.
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stefano65
Senior Member
stefano65
Joined: 30 Oct 2004
Posts: 1,407
Location: Eugene OR
Expertise: Professional

Espresso: Vibiemme,Elektra,
Grinder: Vario,Macap,
Vac Pot: not
Drip: not
Roaster: not
Posted Tue Oct 30, 2012, 2:32pm
Subject: Re: Opv on my Rancilio Silvia
 

se la OPV apre a 9-10 bar va bene, aggiusta la macinatura  in riquardo

 
Stefano Cremonesi
info@espressocare.com
www.espressocare.com
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