Gaggia Users Group

Hardware Discussions => Gaggias with Aluminum/Brass Boilers => Topic started by: doubleshot504 on December 29, 2017, 12:20:15 PM

Title: (Questions) - Homemade pressure gauge for adjusting pressure
Post by: doubleshot504 on December 29, 2017, 12:20:15 PM
I found the old thread (below) listing parts, one of the links is no longer valid.   I also found pictures of a homemade pressure gauge in the library, but no detailed parts list.  Seems like its cheaper to build your own versus buying a premade gauge since they go for $30-$50 from what Ive seen.

Questions:
1.  Is the spout on the stock portafilter made to be disassembled? 
2.  If yes to above, is the thread type on the bottom of the stock portafilter 1/4" NPT?
3.  What is the valve and hose for?  Wouldnt turning off the pump divert the built up pressure to the 3 way valve?
3.  Does anyone have an updated parts list?

Old thread
http://www.gaggiausersgroup.com/index.php/topic,560.msg4842.html#msg4842

Library pictures
http://www.gaggiausersgroup.com/index.php?action=ezportal;sa=page;p=9
Title: Re: (Questions) - Homemade pressure gauge for adjusting pressure
Post by: SusanJoM on December 29, 2017, 01:54:49 PM
1.  Some are molded in which case....no.
2.  3/8"
3.  So you can set for dynamic or static pressure
4.  Just take the picture to the hardware store
Title: Re: (Questions) - Homemade pressure gauge for adjusting pressure
Post by: doubleshot504 on December 29, 2017, 02:08:24 PM
1.  Some are molded in which case....no.
2.  3/8"
3.  So you can set for dynamic or static pressure
4.  Just take the picture to the hardware store

Thanks for the quick response Susan.   Regarding dynamic or static pressure, when should 9 bars be set?  Meaning when the portafilter is pressured with no way of releasing the pressure?
Title: Re: (Questions) - Homemade pressure gauge for adjusting pressure
Post by: SusanJoM on December 29, 2017, 03:19:19 PM
9 bar dynamic (using bleeder valve to simulate flow)
10 bar static (no flow)