Oscilating brew pressure

[issa]

Hey S1 Cafe

I just got my hands on a slightly used two year old Mini Vivaldi, and shortly after I got it back home, I noticed that the brew pressure gauge oscillate.

I decided to inspect the water tank, and gave the chrome a good brushing, just to make sure that wasn't the problem, but no it didn't help, then I removed the pressure regulator valve, descaled and cleaned it, and that only made things worse. Now the gauge oscilate when I have a blind filter in it as well.

I suspect that the spring in the OPV is too soft and that is what is resulting in the issue, but I'm not entirely sure. What do you guys think?

[chas]

Due to the way the Mini is designed that's normal.

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[issa]

But the gauge should be steady at 9 bar pressure with the Blind filter, shouldn't it?

[chas]

No

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[jfrescki]

The brew pressure on my Mini rapidly oscillates from approx 8 - 10 during brewing. I think it's just the vibe pump.

[issa]

The reason why I thought that there where something wrong with it, was because Of This

http://www.youtube.com/watch?v=e4FajUGA ... ata_player

It goes slowly op to nine bars and stay there, so I asumed that was how it was supposed to look like. The last vibration pump machine I owned didn't have brewpressure gauge so I just assumed it would look like the above. I have allot more experience with rotatry vane pump machines, so I'm a bit Surprice that it's fluctating that Much.