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Vibe to rotary - questions before starting...

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Hi All,

I've decided to convert by vibe/tank only Brewtus IV to a rotary/mains feed machine. I am competent with both electrics and plumbing - this job is easy work for me.

Parts are being ordered as i type... saves me buying a R58 or Vesuvius (for now)....

I have the manual from Whole Latte Love (WLL) and the job seems simple enough (attached if anyone wants a copy).

However - there is 1 sticking point the manual appears to miss (hence my main question).... and then a few points for clarity please, if I may...


If i understand correctly, the OPV in the vibe machine returns 'overflow' water to the tank. In the WLL guide, they have a new OPV on the water line just after the pump (pictured)... but where does the 'overflow' pipe (orange arrow) go?


I've seen alternative installs where the OPV is not used. As the pump is set to 9Bar and the other valve (name escapes me) is set to 11/12Bar - can I ignore the OPV altogether? 

For clarification: I intend to fit a main pressure reducer. With the rotary pump adjusted to 9Bar, the main inlet pressure to the pump should be adjusted to 6Bar. Is this correct?


Screenshot 2020-11-20 at 08.53.27.png


Edited by bongo
missed Q 1.ii

Ghe sboro fioi!

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Thanks for the rapid response Dave - I think i edited the questions just as you posted....and then again as you edited your first response. Apologies.

So if I understand -

  1. Yes -the OPV is still needed.
  2. The OPV pipe must go to the drip tray (there wont be a tank).
  3. Mains pressure should be set to 3Bar.


How does the pipe return to the drip tray please?

The only way I can see is drilling a hole in the back of the drip tray and putting the pipe through the hole in the body that was previously used to adjust the OPV with a screw driver (pictured).

I do not intend to use mains drainage.

Screenshot 2020-11-20 at 09.23.07.png

Ghe sboro fioi!

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I'd drill a second hole much higher up under the angled lip, use a small pipe and you may not need to cut the drip tray...where you want to put it would be quite low down and  significantly reduce the capacity of the drip tray.

Edited by DavecUK
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