I want to remove the OPV from Anita and see if it's scaled at all. I've been getting that high squealing sound. Annoying at 4:30am when everyone is asleep. I did adjust the OPV awhile back and I know some have just adjusted it a few times and the squealing sound went away. Looks easy enough to remove and inspect though so I figure I'll just do that. Just want to make sure I take care and not mess anything up as I don't know if there are any internal parts I can mess up while taking out.

It looks like all I have to do is disconnect the tube and undo the nut above the OPV.

FWIW I just de-scaled Anita and sound did not go away. Also used the search function but found nothing on actual how-to for removing OPV.

Thanks,
Ron

Hello Ron you are correct, removing (at least partially) the OPV is as you describe. As long as you have it apart it may be a good time to replace the rubber OPV seat. It may or may not help with the squeal. Unsure if scale has any effect either. Nonetheless take it apart and have a look.

I think descaleing procedure might make a difference too - maybe this applies to your situation.

If you run descale solution through the OPV with no backpressure from the grouphead, you don't flush the valve seat completely.

I noticed an OPV squeal from my HX machine appear toward the end of my last descale interval. For my next descale, I included using a blank in my portafilter and running solution with it in place, forcing solution through the open OPV. The noise went away and hasn't returned.

Thanks guys for the quick replies. I'll post results after using for a few days or so.

Ron

Also see Strange noise coming from my Andreja Premium and Noisy/faulty OPV and use of OPV in general.