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Is there a way to test the OPV valve when it's off the machine?
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SJM
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Posted Fri Jul 6, 2007, 2:16pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Okay now, it took me trips to five different hardware/plumbing supply places today (two of them repeats of the places I went to yesterday looking for the gauge) to find the parts to attach the gauge to the portafilter.  Hurrah.  

The one in the picture is the old dry gauge.  
Do I have to wait for the good one to come or can I experiment with this one?

And, tell me just one more time what it is that I DO with the needle gauge?

Susan

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CraigA
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CraigA
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Posted Fri Jul 6, 2007, 2:28pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

That's great Susan!, however like I've mentioned before (please look above) & Tex alluded to., the gauge will be unreadable. You'll need a Snubber Valve (pressure limiting/dampening valve) pictured below to dampen the wide oscillations of the gauges needle valve that'll make the gauge unreadable without it..

However, to save more unneeded frustration & expense., try your setup without it. Like I said before & cut, copied & pasted an italicized quote of mine above, to explain the purpose of the valve., you're simulating a shot by adjusting the bleed needle valve for approx 1ml/sec (1oz shot) & this is your real time or dynamic shot.

With the valve closed off & no water flow, that's a stagnation or "blind" pressure no flow shot & that'll be 10 bars (147 psi). The real time or running shot will be approx 1 bar less, or 132 psi because of the free flow of water through the properly grind adjusted coffee pack.

That's how it is for the Miss Silvia, YMMV.

CraigA: Snubber Valve.gif

 
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SJM
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Joined: 17 Nov 2004
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Posted Fri Jul 6, 2007, 3:17pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

CraigA Said:

However, to save more unneeded frustration & expense.

Posted July 6, 2007 link

Thanks, Craig.  I have actually ordered a liquid filled gauge;  it just hasn't arrived yet;  and I think I won't need a snubber with IT, right?

And, finally, finally, finally, I think I understand, but let me try to put it in my own words so I know I know what I"m doing.  I'm going to put the portafilter with the pressure gauge on the machine with the needle valve open, turn on the brew switch, and then adjust the needle valve until the volume coming through the tubing is the same as what I want for a shot:  2 oz in 25-30 seconds.  

Once it is set there, I should be able to read the pressure gauge to find out what the dynamic pressure is.   Yes?  

I don't know why I was having such a hard time grasping the concept.  I hope I've got it now.  I really haven't been ignoring your information, I just wasn't processing it particularly well.

Susan
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SJM
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Posted Thu Jul 12, 2007, 2:36pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

bump.

Still having a hard time here.
The new liquid filled pressure gauge is here.
I have attached it to the portafilter with a needle valve at the other end.

I have adjusted the flow through the needle valve so when I turn on the brew switch, the flow is about 2 ml in 25 seconds.

The pressure gauge doesn't even register....nada....

What am I doing wrong?

If I close the needle valve completely, the gauge reads up to 150 PSI, all of which means to me that I have mis-understood what I am adjusting with the needle valve and or something.

Taking the dogs to the park to air out my brain.  
Susan

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CraigA
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CraigA
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Posted Thu Jul 12, 2007, 3:04pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Hi Susan, if I had of looked more closely at your pic earlier, I would of seen that you have an inline 2 port T valve configuration. That's wrong as in your setup., you'd need a 3-way/port T valve (90 tee-off). What you have there, there's no way the water can bleed off through the right angled port to simulate the shot.

Look way back at the beginning of this thread & in my response & the 1st post to you @ the link I have there, you'll indeed see the 3 way/ported T valve that I used.

It dosen't matter though as you can just keep this valve completely closed off. Any water will then come back out of the OPV return line to the water tank. You can just adjust your OPV to a static (stagnation or "dead") pressure of 10 bars (147 psi), rounded off to 150 psi. Your dynamic or "real time" shot brew pressure will then be approx 1 bar lower @ 9 bar (132 psi).

This is what is applicable for my Silvia, & YMMV somwhat. {;-)

 
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SJM
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Joined: 17 Nov 2004
Posts: 1,682
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Expertise: I love coffee

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Grinder: K-10PB, Rancilio MD-50
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Posted Thu Jul 12, 2007, 3:37pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

CraigA Said:

Hi Susan, if I had of looked more closely at your pic earlier, I would of seen that you have an inline 2 port T valve configuration. That's wrong as in your setup., you'd need a 3-way/port T valve (90 tee-off).

Posted July 12, 2007 link

Wait, wait, wait, Craig, mine IS a 3-way/port T-valve.  Look at the picture again.


Maybe there's a problem in the configuration of the 3 ports, though?  Mine has a needle valve at 9:00, the portafilter at 12:00 and the gauge at 3:00.  

Are  you telling me that I need to change the orientation and put the portafilter at 12:00, the gauge at 3:00 and the needle valve at 6:00????

Baffled...
Susan

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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,176
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Thu Jul 12, 2007, 4:10pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

SJM Said:

Wait, wait, wait, Craig, mine IS a 3-way/port T-valve.  Look at the picture again.

Posted July 12, 2007 link

Sorry, my mistake Susan! {:-O, tired, busy & back & forth & I was/am doing dinner.{;-)

Maybe there's a problem in the configuration of the 3 ports, though?  Mine has a needle valve at 9:00, the portafilter at 12:00 and the gauge at 3:00.  
Are  you telling me that I need to change the orientation and put the portafilter at 12:00, the gauge at 3:00 and the needle valve at 6:00????

Baffled...

Sorry, no you're fine! These needle valves certainly aren't precision & a little fiddly, & you may just opt to close it off & adjust for stagnation/static (no flow)
pressure.

O.T. I see your posts on the Gaggia OPV were answered soon enough, & my recent post/s got me nowhere., about Subject: Compatible Grouphead Gasket * Expobar E61 Grouphead *
So I'll ask my question here or on another thread, or the HB forums..

Quote: I've just aquired an Expobar Office Leva. What other compatible E61
grouphead gasket will fit please?
Thanks,
Craig.'


Would a Rancilio Miss Silvia 8mm grouphead gasket fit & work?
TIA!

CraigA: E61 Grouphead1.jpg
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SJM
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Joined: 17 Nov 2004
Posts: 1,682
Location: CA
Expertise: I love coffee

Espresso: SAMA, Gaggia Classic
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
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Roaster: HotTop
Posted Thu Jul 12, 2007, 4:28pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

CraigA Said:

no you're fine!.

Quote: I've just aquired an Expobar Office Leva. What other compatible E61
grouphead gasket will fit please?
Thanks,
Craig.'


Would a Rancilio Miss Silvia 8mm grouphead gasket fit & work?
TIA!

Posted July 12, 2007 link

Whew.  Thanks, and go enjoy your dinner.

As to your question, I've never even seen a E61, so that is totally unknown territory for me.  You might better post it as its own topic to get better visibility, though....

Susan
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,176
Location: Rexdale, Toronto, Ontario, Canada.
Expertise: I live coffee

Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
Drip: Behmor BraZen, BUNN VPR-APS,...
Roaster: Refurb Behmor 1600, BBQ...
Posted Thu Jul 12, 2007, 4:31pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

SJM Said:

Whew.  Thanks, and go enjoy your dinner.

Posted July 12, 2007 link

Already finished Susan!

As to your question, I've never even seen a E61, so that is totally unknown territory for me.  You might better post it as its own topic to get better visibility, though....

Thanks Susan, I'll do that.

CraigA: E61 Grouphead.jpg
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Tex
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Tex
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Posted Thu Jul 12, 2007, 4:47pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

O.T. I see your posts on the Gaggia OPV were answered soon enough, & my recent post/s got me nowhere., about Subject: Compatible Grouphead Gasket * Expobar E61 Grouphead *
So I'll ask my question here or on another thread, or the HB forums..

Quote: I've just aquired an Expobar Office Leva. What other compatible E61
grouphead gasket will fit please?
Thanks,
Craig.'


Would a Rancilio Miss Silvia 8mm grouphead gasket fit & work?
TIA!




I would bet that any e61 group gasket would work. Look for anything with a 75/76mm outside diameter, 56mm inside diameter & 8mm thick. Faema for instance.

 
Tex
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