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Old 06-07-2012, 09:29 PM   #1
jcaudill
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Dec 2010
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Hello All,

I am a "Spunder" and have quickly come to realize the need for some kind of feedback about the pressure being released so you don't under or overshoot target pressure. When doing it with an ordinary pressure relief valve I have never been able to dial in the proper release of pressure to maintain a certain tank pressure because usually it is such a small crack of the pressure valve that is barely audible.

So I have taken inspiration from commercial spunding valve and an idea from Bobby and come up with this:


photo by brewerJP

Note that the PVC cap is a temporary cap while I test the valve - will be the stainless cap you see in the pic below. Here's the exploded view:


photo by brewerJP

And here it is in "action" - input pressure was around 15psi from my air tank:


photo by brewerJP

The idea is pressure is vented against the viton ball. The more pressure you apply to the spring, the less it will let vent. Fill the device with water and you'll see feedback from the release of pressure and you'll have a much better idea of how to adjust the relief. These types of devices are used in many commercial breweries that naturally carbonate at fermentation - which is what I do.

Only problem I'm having at the moment is the spring has a tendency to want to kink. I think this is because the ends really need to be ground and I need to make sure the tap into the cap is perfectly straight. Otherwise - it seems to be dial in really well.

I will post up a parts list after I have the kinks worked out. Just wanted to share it now!



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Old 06-07-2012, 09:55 PM   #2
wailingguitar
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Oct 2011
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The design concept, if not the appearance, reminds me of the Barby-Kuhner valves I used to use in a few pubs. Well done sir.


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Old 06-07-2012, 10:00 PM   #3
jcaudill
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Dec 2010
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That is very much the style of what it is modeled after - so I appreciate that! Those commercial spunding valves are mega-expensive - I've not found them under about $420 bucks and they can be upwards of $800+. That is why I have branched out to see if I could build one.

 
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Old 06-07-2012, 10:06 PM   #4
cscade
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Yeah so this is totally awesome. Subscribed!
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Old 06-07-2012, 10:09 PM   #5
wailingguitar
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You're very welcome! ... and yes they are! I have rebuilt the things a few times and always wondered WHY they cost so much... At the time I was using them they went for about $350 and rebuilding one would set you back around $200... yet, it was a piece of (albeit heavy) plastic, spring, diaphragm, adjustment screw... small stainless housing with threads for TC ferrule and a pressure gauge. I wish I had ASKED someone at the time why they cost so much LOL Maybe it was an issue of liability? Test, double test, insurance, etc. Obviously IF one failed the results could be potentially be VERY ugly... maybe it was because the Germans making them were paying their people the big bucks... I dunno... Whatever... they WORKED and worked well! Again, let me say, GOOD JOB!
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Old 06-07-2012, 11:25 PM   #6
Marquez
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Wow!

I'm ready to build one.

How do you envision calibrating it?

 
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Old 06-08-2012, 12:58 AM   #7
Gwitz
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Apr 2010
Kamloops, British Columbia
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Wow this is cool, all i need to know is where do you get the vitron ball?

 
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Old 06-08-2012, 01:36 PM   #8
jcaudill
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Everything came from McMaster... I will post all the part numbers up once I feel comfortable it's good to go! I need to work out the kinking of the spring which I think might be as simple as grinding the ends.

 
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Old 06-08-2012, 01:38 PM   #9
jcaudill
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Dec 2010
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Quote:
Originally Posted by Marquez View Post
Wow!

I'm ready to build one.

How do you envision calibrating it?
Same way you'd do it with the commercial valves - just do it! Let the tank build pressure over target, then slowly release tension on the spring until you hit the target pressure and see no signs of pressure release. It will take some trial and error at first but then it should be golden and you can lock it in place with the jam nut. That's not to say you shouldn't watch it - because any vessel under pressure you should be watching like a newborn.

 
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Old 06-08-2012, 01:44 PM   #10
mmonacel
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