Posted Mon Aug 9, 2004, 12:07am Subject: Re: Need help adjusting the brew pressure on Livia 90 Auto
I have Bezzera 99 which has the same inners as Livia 90. So I assume they have the same valves for over pressure. The valve in the machine is unfortunately one of the unadjustable ones. There are two ways however: - cut the spring inside so that it has a lesser tension - risky to do it . There is no return back and if you do not cut it very evenly it will make terrible vibration noise. - add some washers into the body.
I have adjusted mine by adding some washers. At the beginning It was set to about 12 bars. If you are pulling doubles it is no problem but pulling double ristrettos is just not possible at these initial settings. Anyway I have mine set to 8,5-9 bar now. It was really difficult to make it water tight with additional washers but it works quite well now. Pulling double ristrettos is so easy. I get that dark colour for 20 secs at least. The taste is much smoother - still not perfect but I am getting to it. With doubles the difference , tastewise , is not that high. However it is just easier to pull doubles now. If you are pulling doubles only , I would say the mod is not that important.
Akin P.S: I do not think it makes a big difference but Bezzeras are having fluid-o-tech pumps. Mine is 70W version.
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