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Originally posted by JavaB link=1161406389/0#9 date=1162106431
Brett...
Now that is a significant saving!!
Have you noticed any improvement in your espresso now that you would be getting longer pre-infusion.
In the preinfusion inherent in the machine, theres a little longer as pressure builds, but more importantly, on my machine (with lever actuated pump), you can do a manual preinfusion. Here is where I noticed I can get incredibly long preinfusions now before any espresso starts to drip through- 15-20 sec- though not sure if this is too long though!
Lots of crema, and it lasts very well
Thanks again, Java
Brett
Originally posted by Fresh_Coffee link=1161406389/0#6 date=1161470228
All,
one MUST NOT plumb in any modern commercial esp machine without also fitting a 350 kPa water pressure limiting valve.
IF the machine is fitted without, it is unable to deliver the pressure required to brew espresso as intended, and there is not consistency in the pressure. The system requires first a pressure reduction, then the machines own water pump can boost to correct pressure without fear of fluctuations in mains poressure throughoiut the day, accounting for peak useage in the mains, etc etc etc.
In addition if a water filter / conditioner is also to be fitted (and it should), running full unreduced mains pressure through the filter can in many cases cause flimsy plastic bodied filters to fail quite quickly.
Hope this helps,
FC.
Thanks FC a pressure reduction valve is on its way
Brett
one MUST NOT plumb in any modern commercial esp machine without also fitting a 350 kPa water pressure limiting valve.
IF the machine is fitted without, it is unable to deliver the pressure required to brew espresso as intended, and there is not consistency in the pressure. The system requires first a pressure reduction, then the machines own water pump can boost to correct pressure without fear of fluctuations in mains poressure throughoiut the day, accounting for peak useage in the mains, etc etc etc.
In addition if a water filter / conditioner is also to be fitted (and it should), running full unreduced mains pressure through the filter can in many cases cause flimsy plastic bodied filters to fail quite quickly.
The water pressure at my house seems quite high and with my bezzera commercial I have a resting pressure on the pump/line gauge of 7 bars, which seems a bit high.
I noticed when the washing machine uses water this will drop to about 5 bars and may swing quite high afterwards. It always returns to seven after the bezzeras pump kicks in. When coffee is extracted the gauge hits about 8 for a few seconds while the preinfusion pressure builds up to about 9 bars.
Should I install a pressure limiting valve for the machine? If so what pressure or what kind?
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