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Topic: *$ barista non-pressure portafilter (87 lines)
1) From: Steven Dover
This is a multi-part message in MIME format.
Here we go again... This thing is NOT in any way "pressurized". The =
"spring" only puts pressure on the handle and keeps it at the point it's =
released at {right/closed or left/open}. When you put the filter group =
on the machine and turn the handle to the right you are closing/stopping =
the flow..... The part that closes/stops the flow works similar to the =
stopper in your bathroom sink. If removed it will look like a straight =
pin with a flat head thats screwed into a rectangular piece of plastic. =
When you move the filter group handle to the right you're allowing the =
pin/rectangular block to drop down and the "head" of the straight pin =
gadget plugs the hole like in your bathroom sink {flow stops}. Move the =
handle to the left and the straight pin gadget gets raised up {like the =
stopper in your bathroom sink} and allows coffee to flow through. =
Pressurized, no - an on/off valve, yes. However, this does allow one to =
pre-infuse the puck *prior* to releasing the flow. 
Pressure is obtained by restricting the flow via fineness of grind and =
hardness of tamp {how hard the coffee is packed}. 
Try this. With the filter group off the machine and the basket removed - =
fill the filter with tap water. Now hold the top of the filter group and =
move the handle to the left {open}. Water will flow through and run out =
the bottom. Now close the filter {hold the top and turn the handle to =
the right}. The flow stops. Now.........if the filter is truly a =
"pressurized" filter, then why did the water flow through when the =
handle was to the left {open}?
Lastly, Good espresso is a direct result of the effort put forth. I.e., =
"It ain't easy".
Steve D. ... Ftr, I've owned a Rio Vapore {same as Proteo Barista and *$ =
Barista} for ~11 years.


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