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Is there a way to test the OPV valve when it's off the machine?
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Discussions > Espresso > Espresso Mods > Is there a way...  
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SJM
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Posted Wed Jul 4, 2007, 4:48pm
Subject: Is there a way to test the OPV valve when it's off the machine?
 

...before putting it back into the machine (Gaggia) and hooking everything back up?

We're talking about the OPV from the Orange Baby Gaggia, here.  It's all removed from the boiler and clean as a whistle, but I don't have a clue how snugly to screw down the adjuster to start, or if there is anything else that could be wrong with it.

Any ideas?
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CraigA
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CraigA
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Posted Wed Jul 4, 2007, 5:33pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Hi Susan,

1st post may help: "Gaggia pressure problem and subsequent fix"

 
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Tex
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Tex
Joined: 27 Apr 2006
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Location: Texas - That's God's country to everyone else!
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Posted Wed Jul 4, 2007, 6:22pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

SJM Said:

...before putting it back into the machine (Gaggia) and hooking everything back up?

We're talking about the OPV from the Orange Baby Gaggia, here.  It's all removed from the boiler and clean as a whistle, but I don't have a clue how snugly to screw down the adjuster to start, or if there is anything else that could be wrong with it.

Any ideas?

Posted July 4, 2007 link




I suppose one could rig a test bed for the OPV, but it'd certainly be easier to test it on the boiler. Here's a link showing how a pressure gauge can be rigged for ~$25. This one lets you perform a static or dynamic brew/group pressure test & has a liquid filled gauge for better accuracy.

Piece of cake!

Tex: P7030015.jpg
(Click for larger image)

 
Tex
--
http://www.tinyurl.com/mb4uj - My coffee pages.

http://www.tinyurl.com/2tnv87 - My 'Guidelines For Newbies' page.

http://www.tinyurl.com/2cr3e2 - I sell things for friends & neighbors here. Can I list something for you?

http://www.tinyurl.com/235dfr - BUG is Bunn User's Group (espresso)
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SJM
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Posts: 1,724
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Expertise: I love coffee

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Posted Wed Jul 4, 2007, 7:03pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Tex Said:

I suppose one could rig a test bed for the OPV, but it'd certainly be easier to test it on the boiler. Here's a link showing how a pressure gauge can be rigged for ~$25. This one lets you perform a static or dynamic brew/group pressure test & has a liquid filled gauge for better accuracy.

Piece of cake!

Posted July 4, 2007 link

Okay, that takes me back to a previous unanswered question of mine.  The pressure gauge I used last week was a dry gauge, and it was simply threaded onto the bottom of the portafilter (with one intervening connector).  

*What is the purpose of the needle valve assembly on yours, and
*Will the one I was using "damage my non-solenoid Coffee?

Yours is definitely prettier, but....do I really need it?

Oh yeah, and what is the difference between a static and a dynamic pressure test?

Susan the curious....

SJM: IMG_2244.JPG
(Click for larger image)
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CraigA
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CraigA
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Location: Rexdale, Toronto, Ontario, Canada.
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Espresso: PID/PressureMod 2001...
Grinder: BUNN FPG-2 DBC, Baratza...
Vac Pot: Bodum Santos manual, Yama 5...
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Posted Wed Jul 4, 2007, 9:28pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

SJM Said:


*What is the purpose of the needle valve assembly on yours, and
*Will the one I was using "damage my non-solenoid Coffee?

Posted July 4, 2007 link

Hi Susan, did you happen to read past that one post on the link I posted hopefully? I explained what the needle valve does., you can adjust to bleed off some water., approx 1 ml/sec to approximate a shot in real time (dynamic).

Yours is definitely prettier, but....do I really need it?

Probably not, but if ya want it to last..

Oh yeah, and what is the difference between a static and a dynamic pressure test?

I've explained it back in my posts in that link above..., & just recently 6 hrs ago Wed July 4th here: "Re: Epiphany - bitter and confused"

Quote from another post: "I can set for stagnation (blind) or dynamic pressure, simulating a shot., or pulling a real shot & measuring exact extraction brew pressure. Stagnation or static (blind) pressure for a Silvia, although not the best way to measure it., should be set for 10 - 10.5 bars & for a dynamic simulated or real shot, the pressure set to 9 - 9.5 bars., (1 bar lower to account for dynamic {running} pressure drop) depending on your particular espresso blend recommendations (temp @ grouphead & extraction pressure)."

 
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Tex
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Tex
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Posted Wed Jul 4, 2007, 11:01pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Okay, that takes me back to a previous unanswered question of mine.  The pressure gauge I used last week was a dry gauge, and it was simply threaded onto the bottom of the portafilter (with one intervening connector).  

*What is the purpose of the needle valve assembly on yours, and
*Will the one I was using "damage my non-solenoid Coffee?

Yours is definitely prettier, but....do I really need it?

Oh yeah, and what is the difference between a static and a dynamic pressure test?

Susan the curious....




Howdy Susan!
  • Static test - water is trapped in the brew group. Because there's no flow the results don't mirror what you'd get pulling a shot.
  • Dynamic test - The needle valve simulates the flow of water through the filter. The results are identical to what you'll get when you pull a shot.

I tried a dry gauge originally but the flutter was such that accurate testing was impossible. If yours doesn't have the flutter it'll be OK, no damage will be caused to your machine.

Good luck!

 
Tex
--
http://www.tinyurl.com/mb4uj - My coffee pages.

http://www.tinyurl.com/2tnv87 - My 'Guidelines For Newbies' page.

http://www.tinyurl.com/2cr3e2 - I sell things for friends & neighbors here. Can I list something for you?

http://www.tinyurl.com/235dfr - BUG is Bunn User's Group (espresso)
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SJM
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Joined: 17 Nov 2004
Posts: 1,724
Location: CA
Expertise: I love coffee

Espresso: SAMA (2), Maximatic, Cremina...
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
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Roaster: HotTop   Huky en route
Posted Thu Jul 5, 2007, 7:05am
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

CraigA Said:

Hi Susan, did you happen to read past that one post on the link I posted hopefully?

Posted July 4, 2007 link

Oh dear, sorry Craig, you are right that I didn't read your response thoroughly enough to see that in fact my question HAD been answered.  

Thanks to you and Thanks to Tex for telling me AGAIN.

I'm gonna go to the hardware store today and get the parts for a better pressure checker.   Since my new PID kit will be coming soon for the Coffee and the Orange Baby will be going back together again soon, I will want to be able to check them both out.

Susan
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CraigA
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CraigA
Joined: 19 Dec 2001
Posts: 11,272
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 5, 2007, 7:55am
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

"The Over Pressure Valve (OPV) - Basics", link to a pdf showing 3 different OPV's & adjustments: Click Here (myweb.tiscali.co.uk)

 
http://twitter.com/CoffeegeekCraig
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Tex
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Tex
Joined: 27 Apr 2006
Posts: 840
Location: Texas - That's God's country to everyone else!
Expertise: Professional

Espresso: Bunn ES-1A (PID'd), Gaggia...
Grinder: Rancilio MD50
Vac Pot: Way too many vintage Silex...
Drip: Melitta Clarity
Roaster: TurboCrazy &...
Posted Thu Jul 5, 2007, 7:14pm
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

I'm gonna go to the hardware store today and get the parts for a better pressure checker.   Since my new PID kit will be coming soon for the Coffee and the Orange Baby will be going back together again soon, I will want to be able to check them both out.

Susan





So, what'd you end up with? It's show & tell time.

 
Tex
--
http://www.tinyurl.com/mb4uj - My coffee pages.

http://www.tinyurl.com/2tnv87 - My 'Guidelines For Newbies' page.

http://www.tinyurl.com/2cr3e2 - I sell things for friends & neighbors here. Can I list something for you?

http://www.tinyurl.com/235dfr - BUG is Bunn User's Group (espresso)
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SJM
Senior Member


Joined: 17 Nov 2004
Posts: 1,724
Location: CA
Expertise: I love coffee

Espresso: SAMA (2), Maximatic, Cremina...
Grinder: K-10PB, Rancilio MD-50
Vac Pot: no like
Drip: no like
Roaster: HotTop   Huky en route
Posted Fri Jul 6, 2007, 7:15am
Subject: Re: Is there a way to test the OPV valve when it's off the machine?
 

Tex Said:

So, what'd you end up with? It's show & tell time.

Posted July 5, 2007 link

Do you really want to hear about how completely annoying it was to go to the salvage yard and two large hardware sorts of stores and find NO liquid filled pressure gauges.  It wasn't so bad that they didn't have them, but the level of condescension when the sales(yup)men looked over their glasses at me and said "what's it for" as if .....Okay, okay, okay, I'm not going to go there.  They were supremely unhelpful and annoying, and I can't help but wondering if I would have gotten just the tiniest bit more respect for my query had I not been a (ha ha ha) girl.

Rant over.

I've ordered the liquid filled gauge from the gaugestore and will have to wait for several days for it to arrive.  Meanwhile I'll head back out to the local stores to find the brass fittings so they are here when my gauge comes.
AND, I have to scrape all that nasty RTV off the boiler so I can put more back on and closer her up again....

AND it's too darn hot here

Okay, so the rant wasn't over, but now it is....Are you sorry you asked

Susan
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