twiztedwords Senior Member Joined: 6 May 2014 Posts: 3 Location: Springfield, MO Expertise: I love coffee
Posted Tue May 6, 2014, 9:07pm Subject: What's this part?.....Expobar Restore, Mysterious Spring Valve
I recently descaled & completely restored an Expobar Amarillo Verde. My first espresso machine restore! Everything went great until I had it all pieced back together & saw this little valve sitting on my work bench. I'm guessing it has something to do with the grouphead, but I don't know for sure. It has no threads & seems to fit perfectly in one of the group copper water line.
Posted Tue May 6, 2014, 9:48pm Subject: Re: What's this part?.....Expobar Restore, Mysterious Spring Valve
Appears to be an anti-vacuum valve. Often there ware mounted on the boiler or on some fitting on the boiler. They allow air to escape during the initial heating of the boiler when the machine is first turned on. The flow of air then pushes the little valve inside closed and then heating continues and pressure can build. It alleviates false pressure which confuses the pressurestat.
Posted Wed May 7, 2014, 6:45am Subject: Re: What's this part?.....Expobar Restore, Mysterious Spring Valve
I believe that is the vacuum valve for the steam boiler. odd that its not threaded.. do you have a photo of the machine? I've never seen the amarillo verde, and expobar tends to use different names in different countries.
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