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Silvia OPV issue or something else?
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seagoon3
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Joined: 16 Sep 2013
Posts: 17
Location: SoCal
Expertise: I like coffee

Espresso: Bezzera BZ10, Silvia with...
Grinder: Pharos, Baratza Vario
Roaster: Behmor 1600
Posted Wed Apr 23, 2014, 3:18pm
Subject: Silvia OPV issue or something else?
 

Good afternoon all

My 2005 Silvia has recently started leaking at the group gasket. I cleaned the group and replaced the gasket, but it still leaks and involuntary Americanos are therefore all I can pull at the moment.

I descaled the machine and forced the descale liquid through the OPV with a blind basket, and then I did a flow test from the OPV overflow pipe a number of times. I'm not sure what would usually happen with a blind basket and a 30 second pull, but in my case every time except one more water leaked from the group gasket than went through the OPV overflow. On the one time it did run for 30 seconds without leaking I got only 50 ml from the overflow. I read that 9 bar at the group head should produce around 250 ml per minute at the OPV overflow with a blind basket. I don't have a pressure gauge to test, but the machine was checked out about a year ago and the pressure was OK then. So if the problem is the OPV, then something has gone wrong, and if so, adjusting the valve is probably not the fix, or is this worth a try? Or would the next step be to take the OPV apart, or should I replace it, or try something else?

I would appreciate some advice before I start messing around with stuff I don't really understand. I'm concerned that the issue might turn out to be something else, like a worn group head, or something to do with the pump, and I might end up needing to replace a chain of things before I find the problem. I'm toying with upgrading, but if it is the OPV, that seems like a relatively cheap and simple fix, and I would probably stick with the Silvia for now.
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JGG
Senior Member
JGG
Joined: 31 Mar 2006
Posts: 1,380
Location: Kentucky, US
Expertise: I like coffee

Espresso: PID Silvia; PID Alexia
Grinder: Mazzer SJ
Roaster: Hottop D w/HTC+TC4C
Posted Wed Apr 23, 2014, 4:32pm
Subject: Re: Silvia OPV issue or something else?
 

The likely scenario is that the group head gasket is not sealing, even though it is new. I know I've had this problem with new gaskets.

Even if the OPV is set high, you should still have no leakage at the group. Deal with the gasket first, then check the pressure using a gauge.

Jim
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seagoon3
Senior Member


Joined: 16 Sep 2013
Posts: 17
Location: SoCal
Expertise: I like coffee

Espresso: Bezzera BZ10, Silvia with...
Grinder: Pharos, Baratza Vario
Roaster: Behmor 1600
Posted Wed Apr 23, 2014, 10:51pm
Subject: Re: Silvia OPV issue or something else?
 

Thanks so much. I'll try another gasket
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