Replacing the Safety Ring

Replacing the safety ring is a simple process. With the right tools, it shouldn’t take more than a minute.

The safety ring is a fail-safe device which will safely depressurise the machine if it’s overheated. You’ll know you need to replace the safety ring if you notice water leaking from a small hole on the side of the ring.

Tools and parts required


  1. Remove the safety valve form the side of the boiler, by unscrewing the whole valve. You may be able to do this with your fingers. If not, use a 13mm spanner (wrench), to loosen it. You want to place your spanner around the nut – that’s the part of the valve that has flat sides. In the image above it’s directly above the gold coloured safety ring, it’s on the outside of the boiler.
  2. Remove the gold coloured safety ring, by pulling it off the safety valve. The two red seals will come off with it.
  3. Push the new safety ring into place, with one red seal located on each side of the safety ring.
  4. Screw the new valve into the threaded hole on the side of the boiler. Screw it in hand tight, then use a 13 mm spanner to tighten so there is “metal on metal” contact between the safety ring and the boiler. You won’t need to tighten it very hard, the thing to feel for is a sudden increase in resistance when screwing it in (that’s when you get metal metal contact).

That’s it! If you have any questions, please either add a comment below, or contact support.

12 replies on “Replacing the Safety Ring

  • Simon

    I have followed the instructions filled the bottom container with 120g of water, put ground coffee in the portafilter and put on a medium heat until I had steam coming out of the chimney but no coffee !? I tried increasing the temperature on full for another 3 minutes but still nothing. I turn the gas cooker off and waiting for it to cool then removed the portfilter to see if there was any evidence of water / steam but it was dry. What do you suggest?

    • Ben @ 9Barista

      Hi Simon,

      It sounds as though your 9machine isn’t receiving enough heat; more heat is usually a good thing with the machine. I’d recommend using the heat exchanger plate, putting it on the largest gas ring and using a high heat.

      If it hasn’t produced any coffee after around 7 minutes, please remove it from the heat and email us at [email protected], and we can help you further.

      All the best, Ben @ 9Barista

  • roman

    i‘d like to know wich material you took for the security valve so i can fix it by my own. i know about the security issue.
    please contact me via email if you dont want to let everyone know it:
    [email protected]


    • Ben @ 9Barista

      Hi Roman,

      If you’re referring to the safety ring, I’m afraid we can’t recommend fixing those. They’re a safety device and as such, they aren’t reusable if they’ve activated. If you need spares, you can buy those here.

      I hope that helps.


  • Brandon

    I’ve burned 2 safety rings too. I _think_ that leaving the machine on a very hot heat exchange plate for even a few seconds after the shot finishes (after the liquid water is gone from the bottom chamber) can burn out the heat sensitive solder in the safety ring.

    • Ben @ 9Barista

      Hi Brandon,

      I’m sorry to hear you’ve had some trouble with the safety ring. Leaving the machine on the exchanger plate while still hot, and after the water has left the lower boiler, will activate the solder in the safety ring. This is a safety measure which stops the machine building up pressure if it has been left on the heat by accident.

      The process we recommend is to turn off the heat as soon as the coffee has finished brewing, which means the safety ring won’t overheat and the exchanger plate will also maintain its shape, in much the same way as you’d remove a pan from the heat after you’ve finished cooking.

      All the best,



  • Mateusz

    I am replacing the safety ring for a third time this month, is it something I do? Is there a way to re-seal it, or is it disposable?

    • Ben @ 9Barista

      Hi Mateusz,

      I think we’ve solved this over email, but just to confirm that we wouldn’t recommend re-soldering the safety ring as it’s crucial for the safety of the machine, so if it wasn’t quite right it may not activate when required.

      We’re much better preventing it melting in the first place. The solder in the safety ring can only melt when there is no water in the lower boiler, so be sure to take the machine off the heat as soon as it’s finished producing espresso. That should prevent it happening again, and save you the hassle of having to replace the safety ring.

      I hope that helps!


  • Yupil Jung

    1. I want to know the size of the Heat Exchanger plate.
    2. Can I change the size of the Heat Exchanger plate?

    • 9Barista


      Thank you for your questions.

      The plate has a diameter of 145mm and it is the only size we have available.




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