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Safety valve on Alex II PID - is it normal?
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katit
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Posted Wed Nov 27, 2013, 1:49pm
Subject: Safety valve on Alex II PID - is it normal?
 

I noticed slight hissing sound when machine warming up. It does it when warm also. Pressure and operation OK

I narroved it down to Safety Valve, I don't remember machine doing it when new. Is it normal? Is it OK? Should valve be replaced? Or it can be cleaned, etc?
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onthego
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Posted Wed Nov 27, 2013, 2:06pm
Subject: Re: Safety valve on Alex II PID - is it normal?
 

katit Said:

I noticed slight hissing sound when machine warming up. It does it when warm also. Pressure and operation OK

I narroved it down to Safety Valve, I don't remember machine doing it when new. Is it normal? Is it OK? Should valve be replaced? Or it can be cleaned, etc?

Posted November 27, 2013 link

Failure of pressure safety valve is fairly common. It needs to be replaced.  Replacement is usually straight forward.  I would contact your vendor for more information.
Ed
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jwoodyu
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jwoodyu
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Posted Wed Nov 27, 2013, 9:12pm
Subject: Re: Safety valve on Alex II PID - is it normal?
 

easy fix and it is one of those things that you might want to just keep a spare in the junk drawer

 
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Woody
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Woody
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Posted Wed Nov 27, 2013, 10:10pm
Subject: Re: Safety valve on Alex II PID - is it normal?
 

This likely culprit is the anti-siphon valve, they get scaled up after a while.  Easily replaced, might also try to remove it when the machine is cool and soak it in descaling solution.

Jon
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SStones
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Posted Fri Nov 29, 2013, 5:30am
Subject: Re: Safety valve on Alex II PID - is it normal?
 

I think you'd said that you'd narrowed it down to the safety relief, but if there is any doubt...
You can put the tip of a cold, stainless-steel knife directly beside or over the possible escape points. The steam will condense quite visibly on cold stainless.
No sense replacing the wrong part, nor replacing a valve if it's only leaking at the fitting or somesuch.
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frcn
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Posted Fri Nov 29, 2013, 9:25am
Subject: Re: Safety valve on Alex II PID - is it normal?
 

If it only happens during warm up it is likely NOT the safety valve but the vacuum breaker valve, and a slight hissing just before the pressure starts to rise in the boiler is normal. That is what it is supposed to do. It is venting air as the water begins to heat up.

 
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jwoodyu
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jwoodyu
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Location: Michigan
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Posted Fri Nov 29, 2013, 9:38am
Subject: Re: Safety valve on Alex II PID - is it normal?
 

OP was it happens when warm. I know that on some of the Alex Duetto II that part has a fairly infamous failure rate.

 
Yes i have a reason for leaving SCG off my list, yes it is my opinion, yes it is subjective as opinions are by definition, no don't start a flame war because you disagree.
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Woody
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Woody
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Posts: 602
Location: Hood River, OR
Expertise: I love coffee

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Grinder: Mazzer Major
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Drip: yuck
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Posted Sat Nov 30, 2013, 6:16pm
Subject: Re: Safety valve on Alex II PID - is it normal?
 

Katit-  FYI vacuum breaker valve = anti-siphon valve.

Jon
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