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Pressure Adjustment on Rancilio Audrey
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sleepdance
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sleepdance
Joined: 27 Feb 2007
Posts: 98
Location: USA
Expertise: I love coffee

Espresso: Faema C85
Grinder: La Pavoni Zip
Vac Pot: Yama
Drip: Newco OCS8
Roaster: Behmor
Posted Sat Feb 2, 2013, 1:52am
Subject: Pressure Adjustment on Rancilio Audrey
 

Is it possible to change the brew pressure on my Rancilio Audrey? It's nearly identical to early Silvias.

Its cold brew pressure is 11 bars, but after heating up it jumps to 12. I'd like to have it at 11 when hot, which would seem to require an adjustment.

Here is the Audrey parts manual: http://www.partsguru.com/user/AudreyParts.pdf
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SStones
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SStones
Joined: 24 Nov 2012
Posts: 477
Location: Canada
Expertise: Professional

Espresso: Giga 5, ECM Giotto, Rocket...
Grinder: Anfim Milano-Best
Vac Pot: No  :(
Drip: Some $30 thing from Walmart
Roaster: I buy pre-roasted.
Posted Mon Feb 4, 2013, 7:54pm
Subject: Re: Pressure Adjustment on Rancilio Audrey
 

The group of parts labled 66 is the connection where your water from the pump flows past the relief (OPV) valve and enters the boiler.  I would say clean it up really well and test your pressure again to see if that makes it more stable (Not changing with heat-swelling) and potentially closer to your desired pressure.  The tighter the spring 64 is holding the valvetip 63, the higher the pressure goes before the valve starts relieving it.  Replacing or doubling up the washer 54 to back off of the spring would lower the relief pressure.
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sleepdance
Senior Member
sleepdance
Joined: 27 Feb 2007
Posts: 98
Location: USA
Expertise: I love coffee

Espresso: Faema C85
Grinder: La Pavoni Zip
Vac Pot: Yama
Drip: Newco OCS8
Roaster: Behmor
Posted Tue Feb 5, 2013, 4:57am
Subject: Re: Pressure Adjustment on Rancilio Audrey
 

Thanks so much for the helpful answer!
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