Theres a handy way to establish what the Silvia over-pressure valve is set at, without the use of a gauge.
The ulka website http://www.ulka.it/eng/E.htm# says water flow at 9 bar should be 250 ml per minute.
Place a blind filter into the portafilter, lift the water return hose from the tank so it will empty into a calibrated container.
Turn on the brew switch and time, say, for 20 seconds, noting how much water is pumped into the container in that time.
If it works out at 250 mls per minute -- the machine is doing fine, set for ideal extractions.
Robusto
The ulka website http://www.ulka.it/eng/E.htm# says water flow at 9 bar should be 250 ml per minute.
Place a blind filter into the portafilter, lift the water return hose from the tank so it will empty into a calibrated container.
Turn on the brew switch and time, say, for 20 seconds, noting how much water is pumped into the container in that time.
If it works out at 250 mls per minute -- the machine is doing fine, set for ideal extractions.
Robusto

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