Question about Bialetti Mukka Express

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The pressure valve on my Mukka Express doesn't pop up. Instead after 10 minutes the valve is forced off. I rinse it really well and have even put it in boiling water. How do I get it to pop up?

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Koral Ilgun

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I have the same problem. I cleaned all the parts, changed the pressure valve, cleaned the gasket, filters, everything. I hear the steam escaping from the overflow valve and if at that point I manually pull the valve up, then it does (barely) pop and steam the milk, but not as well as it used to.

Posted on Aug 05, 2011

  • Koral Ilgun Aug 05, 2011

    I saw this solution in another post which made sense: "the safety valve on the lower boiler chamber is there to release pressure in case too much pressure builds up in the pot when brewing. If you have an 11 mm wrench you can take it out and clean it by pulling on the outside part, there is a little knob that may be grabbed by a tweezer, gently pull it out, it is spring tensioned, and run water in the opposite end, Chances are some coffee grounds particles got in it and it is not seating good. after cleaning put a few drops of olive oil in it , the inside part. Should seal better and still function as a safety valve. Or you can leave it in place in the pot and just pull on the outside , flush with water and then put a few drops of olive oil in it. While you are at it, put olive oil on the threads, olive oil film and the the rubber seal and add a little to the rubber button on the top valve."

  • Koral Ilgun Aug 20, 2011

    I did all the cleaning of the safety valve as I described in another post, but it didn't help. I then ordered a "15mm bialetti valve - silver" fromhttp://www.bialettishop.com/PartsValveEs... and now my mukka express performs as good as new.

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Adam Sharif

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I had this problem with my Mukka Express and was determined to fix it myself rather than buy a new valve. after trying various things the solution came to me, I used one of those plastic and metal flexible food ties, removed the plastic and then pushed the flexible metal part through the bronze opening on the valve, poked it about and then blew and sucked through that opening to clear it fully. Next I put it on the stove, fully assembled, without any coffee in and it worked again!

There's no need to buy a new valve, you just need something thin and flexible and you can clear it, even a piece of wire may work.

Hope this helps others as I didn't find any solutions elsewhere!

Posted on Mar 29, 2014

  • BAW30s Sep 04, 2017

    This is an excellent idea which often does the trick. Once I was so desperate, though, that I added about 20% of drain unblocking fluid to the water in the lower vessel and ran it through a few times without any coffee into cold water (not milk) into the upper part until the valve was unblocked and the water started to flow in a milky stream. Push down and release the black button of the valve above frequently if it feels raised and under strong pressure; when unblocked, the pressure should not be high. If the safety valve below starts to leak, turn off the heat at once and keep pushing down and releasing the valve. I would wear goggles, and prepare to make a mess.

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