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Does a flow restrictor improve shot quality?
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Burner0000
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Joined: 28 Jul 2011
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Location: Cambridge, Ontario Canada
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Espresso: Rancilio Silvia, VFA Expres...
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Posted Thu Mar 7, 2013, 9:14am
Subject: Does a flow restrictor improve shot quality?
 

I am wondering if a flow restrictor improves shot quality or not?  I am thinking of trying to add one to my Silvia just for fun. I think larger machines like the rocket have them as well as commercial one too.  Do they play a big role during extraction?
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ddubick
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Posted Thu Mar 7, 2013, 10:51am
Subject: Re: Does a flow restrictor improve shot quality?
 

The machines that have flow restrictors are heat-exchanger (HX) machines.  Your Silvia is a completely different breed of machine - single boiler dual use (SBDU).

As I understand it flow restrictors are used in HX machines to create a pressure ramp profile to achieve pre-infusion or dampening of the coffee grounds.  

There are no extra chambers in a SBDU grouphead to fill by flow restriction to acheive pre-infusion.

Pre-infusion in SBDU is usually done (from my experience) by running the pump for a few seconds (not letting full pressure build up), turning it off for a few seconds, and then turning it back on to brew.  This is what the pre-infusion function on my old Silvia's Auber PID did.  Run for 2.5s, off for 2.5s, brew for 28s.

Flow restrictors are also used in an HX thermosyphon loop to control the temperatures, which is completely inapplicable to a SBDU.

Someone PLEASE correct me if I'm wrong on any of this.
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D4F
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Joined: 15 Mar 2012
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Espresso: Gaggia Classic PID
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Posted Thu Mar 7, 2013, 12:00pm
Subject: Re: Does a flow restrictor improve shot quality?
 

Similar to above.  I recently read about flow restrictors and gicleurs to try to understand the Oscar Mod thread.  Helen or Markarian may chime in, but I looked here

http://coffeegeek.com/forums/espresso/machines/267906

http://coffeegeek.com/forums/espresso/questions/211508

Click Here (www.home-barista.com)

Seems mostly about the Hx group temperatures, thermosyphon loop, and amount of flush.

 
D4F also at
http://www.gaggiausersgroup.com/
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Burner0000
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Joined: 28 Jul 2011
Posts: 1,090
Location: Cambridge, Ontario Canada
Expertise: Professional

Espresso: Rancilio Silvia, VFA Expres...
Grinder: Macap MX/VFA N1464/Kyocera...
Drip: Manual Drip, French Press
Roaster: Behmor 1600 / Sonofresco
Posted Thu Mar 7, 2013, 12:37pm
Subject: Re: Does a flow restrictor improve shot quality?
 

Thanks.  I was just wondering. A video of a bottomless pull on a rocket machine gave me the idea.  I didn't know it had to do with pre infusion.  I simply wanted to slow a pull for optimal extraction which I can do by bleeding some pressure with the steam valve.
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nobbi4711
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nobbi4711
Joined: 20 Apr 2005
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Location: Germany
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Espresso: Dallacorte Mini EX4
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Posted Tue Mar 26, 2013, 1:50pm
Subject: Re: Does a flow restrictor improve shot quality?
 

Use an EX4 pump instead of the original EX5, that will give you some extra seconds of preinfusion and a softer increasing ramp.

Greetings \\//

Marcus
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calblacksmith
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calblacksmith
Joined: 25 Nov 2007
Posts: 7,864
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Mar 27, 2013, 6:12am
Subject: Re: Does a flow restrictor improve shot quality?
 

In an E61, the restrictor is to adjust the flow of heating water to the GH, more restriction, a cooler GH, less restriction, a hotter GH.

Sylvia does not have a place to put a restrictor and it would not help anything either.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
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