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Overpressure only when plumbed to water
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Discussions > Espresso > Machines > Overpressure...  
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sterett31
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Joined: 16 Jun 2014
Posts: 2
Location: Florida
Expertise: I love coffee

Posted Mon Jun 16, 2014, 1:47pm
Subject: Overpressure only when plumbed to water
 

I've got a Bezzera BZ40 that recently started intermittently over-pressuring.  The issue is the OPV valve starts leaking water all over and when turning on the steam wand water comes out.   The pressure drops immediately if I open the steam wand or hot water valve, but then goes right back up and starts leaking again out the OPV.  Even if I turn off the machine and unplug it from the wall, the pressure still goes up and leaks water out the OPV.  It doesn't matter if the machine is hot or cold and on or off, it leaks from OPV when plumbed into water line.  The weird thing is that I'll plug it into the water line and it will work for a while, but then intermittently the issue will start up again.  Also note that the pump is not turning on, so does not appear to be a factor in the cause of this issue.

I've unhooked the water feed line and put it in a 5 gallon water container and that works fine.  But I would like to solve the real problem and plumb back into my water line.  Any help is appreciated.
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Angman
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Angman
Joined: 8 Apr 2012
Posts: 239
Location: Vancouver BC
Expertise: I live coffee

Espresso: Strega, MCal, Cimbali M20L
Grinder: K10 Fresh, HG One 83mm,...
Vac Pot: Nope
Drip: Technivorm, Hario Woodneck,...
Roaster: Hottop 8828P
Posted Mon Jun 16, 2014, 2:57pm
Subject: Re: Overpressure only when plumbed to water
 

Funny you mentioned this. I was just reading my Vivaldi manual as I had a similar problem.  Realized i forgot to add a pressure regulator on after plumbing it in.  You need something like this to solve your issue.  If your water line pressure is too high you will need one to reduce incoming line pressure. I have an extra plastic one from Chris Coffee and a Solid Brass Italian made one if you need one.  Just PM me

https://www.chriscoffee.com/Pressure-Regulator-Valves-with-Gauge-p/334gg.htm
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__________
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Joined: 12 Sep 2006
Posts: 919
Location: .
Expertise: Just starting

Espresso: Machine now fixed ;o)
Grinder: None
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Drip: None
Roaster: None
Posted Mon Jun 16, 2014, 3:56pm
Subject: Re: Overpressure only when plumbed to water
 

Check the water level in the boiler.  If you have water coming out with the steam, it is a symptom of the boiler over-filling and, water being (for all practical purposes) not compressible, it will often cause the Over Pressure Valve to be activated.  

Might be that the fill valve or diverter is faulty and leaking water through into the boiler when it shouldn't - are you supplying the machine with pressure within the range specified by Bezzera ?

Or possibly the water level control system is malfunctioning.   You can test this normally by removing the connector from the fill probe and grounding it *** - if the fill stops, the control box is working, and in that case things would point to the probe itself.  These can scale easily and stop working properly.

*** obviously, you take great care when working inside a live machine !

Edit - just realised this is an HX machine, so there's always the possibility of the HX leaking into the boiler, although hopefully that isn't the problem as you say it isn't connected with the pump being on.
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sterett31
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Joined: 16 Jun 2014
Posts: 2
Location: Florida
Expertise: I love coffee

Posted Sun Jun 22, 2014, 6:07pm
Subject: Re: Overpressure only when plumbed to water
 

Thanks for the advice. It was a sticky/stuck open solenoid valve that let water flow freely into the boiler and push out through the overpressure relief valve causing the leak. That's why it did not matter if machine was turned on and only happened when plumbed to water line. Disassembled the solenoid valve, soaked in vinegar and reinstalled.  Problem solved.
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