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Netphilosopher
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Joined: 14 Jan 2011
Posts: 1,602
Location: USA
Expertise: Just starting

Posted Tue Jun 12, 2012, 4:28am
Subject: .
 

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jpender
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jpender
Joined: 11 Jul 2011
Posts: 722
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Tue Jun 12, 2012, 8:03am
Subject: Re: Moka pot pressure
 

Netphilosopher Said:

Just thinking, couldn't you just plumb in a T-connection in the safety valve port with the safety valve on one leg and a pressure transducer (or even a schraeder valve which you could attach a standard pressure gage) on the other?

Then, just make some moka pot coffee and measure the pressure directly?  I'm just scanning the thread, so I'm prolly missing something.

Posted June 12, 2012 link

There are two things that need to be considered. One is minimizing added headspace volume and the other is protecting the sensor from the heat source and the hot vapor. It's something I plan to do eventually but at the time it was a lot easier to just plug in a pump.

Netphilosopher Said:

More importantly, how did the results taste?  LOL

Posted June 12, 2012 link

I didn't record any tasting notes but as I recall they were a little weird.

After I finished but before tearing everything apart I tried to pump the system up to 8 bar to "pull a shot" through my trusty 25 year old moka pot, just for fun. I loaded and tamped finely ground coffee, added near boiling water, and started raising the pressure. But the plastic tubing and epoxied connection to the air ballast (a 2 liter coke bottle) just weren't up to the task and air began leaking at 6 bar. I opened the valve anyways and the connection to the moka pot itself promptly failed. This is probably something I should have filed under your silly coffee tricks thread.
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jpender
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jpender
Joined: 11 Jul 2011
Posts: 722
Location: California
Expertise: I like coffee

Grinder: OE LIDO
Vac Pot: S/S Moka Pot
Drip: Aeropress
Posted Tue Jun 12, 2012, 8:14am
Subject: Re: Moka pot pressure
 

blekk Said:

Hi jpender thanks for the reply.  I have a Brikka and it has the 15mm safety valve for which I assume has a higher rating due to the design of the Brikka but I would think it would only be about 0.5 bar more then the standard Moka pot.

That's a great idea setting up a test bench btw, Im not sure why I didn't think of it (Mech Engineering student)..... I might give it a try once I finish my exams this week.

Posted June 12, 2012 link

I don't have any idea what the differences are between the two sized Bialetti valves. Maybe they're just different sizes for different pots but the same rating?

If you do the test post up your results. I'd try it but my pot is not a Bialetti and it's safety valve is old and seems to release a little too easily.


edit: I emailed Bialetti and asked about the pressure threshold but the person who responded said he didn't know, just said to keep the screen clean.

Good luck on your exams!
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Netphilosopher
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Location: USA
Expertise: Just starting

Posted Tue Jun 12, 2012, 12:17pm
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