Kape17 Greetings from SoCal USA! I just want to get some solution if it is a problem or an issue with my Vesuvius machine. I just installed a manometer on my group head today. My profile (gear pump) is set to 9bar but when I tested it with a blind basket the group head manometer is reading at 10.5 bar.
There is absolutely no problem with the machine. I’ll explain briefly in bullet point steps of what’s happening. You clearly have a blind filter installed, so the system can’t work properly. I think I explained it in the manual somewhere, and probably in a video about the Vesuvius on my YouTube channel.
- System has 1 way valve after pump
- blind filter prevents the slightest bit of excess pressure leaving, not even a single drop, which wouldn’t happen with coffee.
- Pump runs up to pressure PID sees target approaching stops pump as quick as it can, but slight overshoot…you can change pump PID settings and pump acceleration to minimise that. Not possible to entirely eliminate some slight overshoot for a brief moment
- Pressure is now locked in, cant go forwards, can’t go back, can’t go down…
- sealed brew circuit heats water, which expands, so maintains or even increases pressure
In a sealed circuit added even 1 drop increases pressure hugely as water cannot be compressed. With coffee this wouldn’t happen, or with a scace 2 that has a valve, this doesn’t happen as water can escape at the same speed as through espresso.
Moral of the story, don’t check the machine with a blind filter, you prevent it working as it should. Hope that helps.
