Vesuvius Pressure Profiling Machine - General Discussion

Thank you @DavecUK .

No, HX is been always off. I tried with hx on just to check if there was any variance but there was no difference being on or off.

As you told me a couple of years ago (if I remember well) HX could be a cause, I replaced this solenoid just to be safe (beside right panel, next to the steam boiler). Apart from this solenoid I replaced the water distributor and auto fill solenoid, everything on this piece but the pressure sensor.

tocateclas pressure sensor.

Swiss made, don’t seem to go wrong…I really am out of ideas.

DavecUK Not a pressure sensor problem, I’m sure it’s not.

Regarding your concern about the HX and despite knowing it’s properly closed by the solenoid: could it by bypassed or cut? I mean if there is any chance to block this hx circuit and let the brew circuit shorter and free from its possible incidence. Sorry it this is a nonsense, I’m not a technician!

tocateclas Regarding your concern about the HX and despite knowing it’s properly closed by the solenoid: could it by bypassed or cut? I mean if there is any chance to block this hx circuit and let the brew circuit shorter and free from its possible incidence. Sorry it this is a nonsense, I’m not a technician!

Yes this could be done.

DavecUK Thank you again. If it’s not too complicated it would be nice to try. I don’t know if this makes any sense but there are not many things to try.

tocateclas Thank you again. If it’s not too complicated it would be nice to try. I don’t know if this makes any sense but there are not many things to try.

You need to ask the factory how as it might depend on your build and Paolo recently saw your machine.

Is said machine in the UK? do you still own the machine?

Jony No, machines are in Spain. Mine was sold but it’s nearby, I really hope it could be solved as this is a great machine.

tocateclas @Jony tocateclas @jony could ride back with that on his shoulders :)

Maybe not 😀

DavecUK Correct me please if I’m wrong. I do not have the machine so I can not take a look inside. About how the HX works: there is the solenoid on the right side of the machine, the one I changed. This valve is letting the water to pass through the hx but there is no valve in the other end of the steam boiler? Am I right? In this case the hx would be always full of water? Then it can expand when heated and push in some place the brew circuit causing the issue? If this was the case I’m quite confident in this is what happens in these machines.

It seems to have an easy fix then, just hope this was the cause.

tocateclas Then it can expand when heated and push in some place the brew circuit causing the issue? If this was the case I’m quite confident in this is what happens in these machines.

No, this won’t be happening, during a shot everything is open if HX is on and that hydraulic pressure caused by heating water becomes a non-issue, it also causes no pump back pressure.

DavecUK Thank you. Sorry for my English… I meant if this hx has some contact with the brew circuit when hx is off.

tocateclas I meant if this hx has some contact with the brew circuit when hx is off.

You need to read my earlier post about the theory of what might be happening because I am sure you have misunderstood it.

I am not concerned about any leakage to the sealed brew circuit as such in the way you mean…I’m worried about the pump trying to overcome Hydraulic pressure due to water expansion behind a non return valve.

Can anyone with this machine tell me what their is like as I think I’m loosing it.

I am under impression the steam boiler pressure drops lower and recovers much slower during steaming than it used to. I had it set at 125c and recently found I had to increase to 127c which is still not whatnot should be.

I flush and wait for it to come back to 127c before starting to steam. Only 160ml milk in the pitcher.
It falls to 122c before you notice it starting to recover although you can hear the boiler kick in around 125c.

I hope it’s just my mind playing games but I am convinced it wasn’t like that.

prezes Check your advanced settings because it sounds as if the steamboiler is behaving more like a PID control than on/off control. You need to set the PID parameters for the steamboiler to behave like an/off controller.

DavecUK thanks @DavecUK . These are the settings at the moment:

prezes if that’s settings for the steam boiler, change them to kP =20, kI=0 and kD= 0

is there an associated B setting for the steam boiler?

DavecUK I’m sorry Dave I had to double check. The above are brew boiler settings.

Steam boiler: