Hi,

I'm wondering why there is 2 opv's on my machine (Bezzera BZ99). There is one right after the pump and another one on the left side of the machine. Both seem to have an impact on the brew pressure.

Can anyone explain the need of 2 opv's and which one I should play with?

Here's a picture of the one right after the pump :


And another one from the left side :


Thanks

Anyone?