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portafilter: proteo barista
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romanhands
Senior Member


Joined: 3 Nov 2013
Posts: 13
Location: south dakot
Expertise: Just starting

Espresso: proteo grande
Grinder: antique wooden hand grinder
Posted Thu Nov 14, 2013, 9:09pm
Subject: portafilter: proteo barista
 

can someone please explain to me the reason for pressurized portafilter's spring-loaded action in the proteo barista (starbucks barista)?  i have the proteo barista, and i know the portafilter has been updated more recently.  i have the old version.  but they are both spring loaded (pretty sure).  i took it apart to view it internally and reassembled.  in the filter i have, there is a round rubber "flap" that moves up and down depending on where the handle is placed (once it is attached to the machine).  as per instructions, you tighten the filter handle when mounting on the machine.  then it "springs" back to a neutral position.  in this position, the water flows freely through the filter basket and into the glass.  when you push the handle in the other direction, it essentially stops the flow of water from the filter.  what is the reason for this?  is it just so you can push it back so that water/coffee doesn't drip back out when you remove the cup?  i would assume there's a better reason for that.... unless mine isn't functioning properly.  

i thought by being "pressurized", the flow would be blocked until it reached a certain pressure, then the pressure would cause whatever flap was inside to move, thereby releasing water/coffee.  as far as i can see, there is no pressure "building" anywhere...

i know what the pressurized pressures are for... kind of cheating- eliminating grind size/tamp as a variable.  but i'm failing to see how the thing functions.  please clue me in!  thanks.
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