Yes 30in30, thats the one and the adjustment will be anti-clockwise.Originally Posted by 30in30 link=1210165318/0#0 date=1210165318
Hopefully its a brass central screw as the original plastic ones were prone to leak if adjusted.
Be aware that your pressure gauge will show system pressure, not pressure at the group and therefore the only way to accurately make an opv valve adjustment is to use a portafilter pressure gauge. I have seen machine gauges read up to 2.5 bar over what the actual group pressure is.
If your machine is new, Id set it at no less than 9.5 bar as the pump often "beds in" with a resultant drop of about 0.5 bar pressure. This *may* void your warranty depending on your dealers attitude. Perhaps it may be best to have it done where you purchased the machine?
Good luck ;)