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.
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.