Posted Sun Jul 8, 2012, 5:31am 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?
calblacksmith Moderator Joined: 25 Nov 2007 Posts: 5,761 Location: Riverside, Ca, U.S.A. Expertise: I live coffee
Espresso: ECM Veneziano A1 Grinder: Many different commercial Vac Pot: 40s era Silex Drip: Milita, Bunn&Curtis... Roaster: Cast iron pan, gas burner
Posted Thu Jul 12, 2012, 1:12pm 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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Posted Sat Jul 14, 2012, 12:43pm 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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