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Mypressi Depressurization?
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Senior Member

Joined: 29 Apr 2013
Posts: 23
Location: Washington DC
Expertise: Pro Barista

Posted Fri May 17, 2013, 4:28am
Subject: Mypressi Depressurization?

Hey all!

I've been looking around a little bit on the internet and can't find an answer to my question. Please help!

If I don't need to use all 4 shots, for whatever reason, and need to manually depressurize the Mypressi what would be the best way to go about doing this? I feel like I will break the Mypressi or freeze o-rings if I just open the back end of the mypressi and let the remaining N2O gush out.  Is there a safe way to shoot water through the system to use up the remaining N2O, a pressure release valve, or do you simply just unscrew the back end and let it all rush out?

Also, I noticed Mypressi is sold out of the machines on their site. Any speculation on what that means? Shipping issues, product issues, new version, etc? I wanted to get one for my dad as a gift. Looks like I will have to wait!

On a side note, I love the mypressi and I will add my recommendation to the very long list of satisfied customers.  I am an experienced barista and the shots that the Mypressi makes are unbelievable.

Any help would be greatly appreciated!
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Senior Member

Joined: 25 Jan 2011
Posts: 423
Location: Internet
Expertise: I love coffee

Posted Fri May 17, 2013, 8:29am
Subject: Re: Mypressi Depressurization?

Dear Lilpro,

Why can't you just leave the gas cartridge alone in the handle?  Mine have never lost gas during the occasional weeks of disuse (lately I have used it daily for the last year).

If there is a lot of gas remaining in the cartridge, unscrewing the back of the handle is not a good idea.  The full discharge of gas from an unregulated cartridge can produce a temperature drop of the cartridge metal, enough to cause mild frostbite.  There is also a risk that the cartridge will take off like a jet and fly through your kitchen.  We used to do this on purpose as kids until one flew into my parents' living room picture window.  Just pull the trigger and let it evacuate through the supply hole and remove the cartridge with a towel.  The silicone o-ring won't care.  If you are worried about losing the o-ring, just evacuate through the empty water reservoir in place.  No need to fill it.  If the cartridge is half-used, the handle back can be taken off rather safely.

To asses the level of gas in the cartridge, just weight the unassembled handle with the cartridge in it (and end screwed on).  Just make sure the handle is dry.  A handle with full cartridge should weight about 513 grams while one that is empty should weigh about 506.5 grams.  Weigh your handle both full and with empty cartridge in place to determine your own data.  This should come in handy if you forget how many times you have used the cartridge.

By the way, I find that cartridges vary in quality.  The best seem to be Ultra-Purewhip.  The best deal seems to be to buy cheaper ones (not U-P) at auction in lots of 200-300 and accept the occasional 'one-dose dud'.  Don't blame Mypressi for that.

If you want to know about the availability of MYpressi, just write to them!  They are good about answering their e-mail, especially now that all of the coffee conventions are over.

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