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Oscar pressure valve problem
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melstander
Senior Member
melstander
Joined: 15 May 2012
Posts: 2
Location: South Africa
Expertise: I love coffee

Espresso: Simonelli Oscar
Grinder: Rocky
Vac Pot: None
Drip: None
Roaster: None
Posted Sun Jul 8, 2012, 4:31am
Subject: Oscar pressure valve problem
 

Good day Geekers

I seem to have developed a problem with my old oscar. It has suddenly started releasing a lot of steam from the pressure relief valve just below the pressure stat. My question is thus: Is this indicative of a faulty pressure relief valve or is it that the pressure stat or thermostat are faulty and building up too much steam? How does one determine which is causing the problem?

Any help will be appreciated.
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calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,947
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 Thu Jul 12, 2012, 12:12pm
Subject: Re: Oscar pressure valve problem
 

Without more info, sounds like the Pstat. Pstat has moving parts that wear, the safety valve, just sits there unless you get too high of a pressure which indicates that the heater is not turning off which leads you back to the Pstat.

Is the brew water over temp too? Have you checked with a thermometer? If the water is hot, too hot, the Pstat is the first place to look.

 
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melstander
Senior Member
melstander
Joined: 15 May 2012
Posts: 2
Location: South Africa
Expertise: I love coffee

Espresso: Simonelli Oscar
Grinder: Rocky
Vac Pot: None
Drip: None
Roaster: None
Posted Sat Jul 14, 2012, 11:43am
Subject: Re: Oscar pressure valve problem
 

While I have been in there I decided to strip the machine and discovered the mild steel painted frame is also quite rusted. So I am in the process of  repairing this as well.

Anyway thanks for you advice and it appears that you were right. I have decided to replace the safety valve as well as the p-stat while Im at it. I realised after a while that the water was too hot and followed up from there.
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