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Constant Steam from OPV / Safety Value? (Isomac HX)
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Discussions > Espresso > Machines > Constant Steam...  
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livin
Senior Member
livin
Joined: 24 May 2005
Posts: 299
Location: Arizona
Expertise: I love coffee

Espresso: Isomac Millinum
Grinder: Mazzer Mini E
Vac Pot: French Press!
Drip: people drink this?
Roaster: Riviera Coffee, Chandler AZ
Posted Sat May 17, 2014, 9:44am
Subject: Constant Steam from OPV / Safety Value? (Isomac HX)
 

This problem started yesterday after I did some maintenance on the machine - cleaning inside the case, removed the heating element (HE) to look inside the boiler, etc. I did not backflush or descale, I did that already weeks ago. My boiler is spotless inside. I have a water filter fine mesh screen on the intake tube and I use only RO water.

I did lay the machine on its side for a bit of time to remove the HE. Other than that nothing out of the ordinary.

After putting it back together, I started the machine and did a boiler fill...

OPV (safety valve at the top of the boiler) constantly spews lots of steam, and very loudly... it never stops. I also get more water than normal leaving the small curved metal tub going into the drain pan.


It has the original OPV - image attached

Did something happen to the OPV when I turned the machine on its side?

If I remove the OPV to clean, does it need to be re-adjusted for my machine?
(anyone know what size wrench I need?)

thanks for the help... I'm baffled!

livin: SafetyValve.jpg
(Click for larger image)
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hillm
Senior Member


Joined: 17 Sep 2004
Posts: 10
Location: Gilchrist, OR
Expertise: I love coffee

Posted Fri May 23, 2014, 9:28pm
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

I have a many years old Isomac Tea and my pressure relief valve failed last week. I used a spark plug wrench to take it off and after disassembling I saw that the problem was that the plastic piece that makes the seal was deformed. I wasn't able to locate an exact replacement but got something similar from cafeparts dot com. Part number 50915. $14.04. I checked several sites and prices for similar valves ranged from this to >$40. Now, I haven't installed and tested it yet but I'm pretty sure it'll work.
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DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,415
Location: UK
Expertise: I love coffee

Posted Sat May 24, 2014, 3:01am
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

hillm Said:

I have a many years old Isomac Tea and my pressure relief valve failed last week. I used a spark plug wrench to take it off and after disassembling I saw that the problem was that the plastic piece that makes the seal was deformed. I wasn't able to locate an exact replacement but got something similar from cafeparts dot com. Part number 50915. $14.04. I checked several sites and prices for similar valves ranged from this to >$40. Now, I haven't installed and tested it yet but I'm pretty sure it'll work.

Posted May 23, 2014 link

Echo the above, your safety valve needs replacement. As long as the replacement part has the same thread size and is 2.3 bar or below (even up to 2.5 bar), it will work absolutely fine. When you remove be prepared for bits of threadlocker to fall in the boiler, try to avoid this and  fit with teflon tape
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CSME9
Senior Member
CSME9
Joined: 26 Feb 2004
Posts: 281
Location: West Texas
Expertise: I live coffee

Espresso: Bezzera Mitica Top, Spaz...
Grinder: Rancilio Rocky
Drip: Moka Pot
Roaster: BBQ Roaster
Posted Sat May 24, 2014, 6:12am
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

livin Said:

This problem started yesterday after I did some maintenance on the machine - cleaning inside the case, removed the heating element (HE) to look inside the boiler, etc. I did not backflush or descale, I did that already weeks ago. My boiler is spotless inside. I have a water filter fine mesh screen on the intake tube and I use only RO water.

I did lay the machine on its side for a bit of time to remove the HE. Other than that nothing out of the ordinary.

After putting it back together, I started the machine and did a boiler fill...

OPV (safety valve at the top of the boiler) constantly spews lots of steam, and very loudly... it never stops. I also get more water than normal leaving the small curved metal tub going into the drain pan.


It has the original OPV - image attached

Did something happen to the OPV when I turned the machine on its side?

If I remove the OPV to clean, does it need to be re-adjusted for my machine?
(anyone know what size wrench I need?)

thanks for the help... I'm baffled!

Posted May 17, 2014 link


See here
https://espressocare.com/Qstore/ Qstore.cgi?CMD=009&DEPT=115 8362623&CAT=1158972009& SUBCAT=1351700494&ADMIN=YES
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__________
Senior Member


Joined: 12 Sep 2006
Posts: 904
Location: .
Expertise: Just starting

Espresso: Machine now fixed ;o)
Grinder: None
Vac Pot: None
Drip: None
Roaster: None
Posted Sat May 24, 2014, 6:34am
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

I had this problem recently (not on an Isomac HX) and the cause turned out to be that the steam boiler (mine is a double boiler machine) was over filling with water because the level probe wasn't doing its job properly.  Cleaned the probe which had a slight amount of scale on it, and now it's back to normal. Nothing out of the safety valve.  It's always possible you may have disturbed it in your machine when doing the maintenance.

In my case, the give-away as to the underlying cause was a lot of water droplets from the steam wand, and water as well as steam coming out of the boiler safety valve.

Proper threadlocker like Loctite 577 is probably what the manufacturer will have used to seal the joint.  Not too expensive and very easy to use. Does a very good job.
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livin
Senior Member
livin
Joined: 24 May 2005
Posts: 299
Location: Arizona
Expertise: I love coffee

Espresso: Isomac Millinum
Grinder: Mazzer Mini E
Vac Pot: French Press!
Drip: people drink this?
Roaster: Riviera Coffee, Chandler AZ
Posted Sat May 24, 2014, 8:19am
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

thanks guys... I will pull the water level probe and safety valve and clean it. Oddly enough, the machine is working now just fine... I can hear a small spirt of steam coming from the valve every few seconds, no more excess water our of the drain tube.
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__________
Senior Member


Joined: 12 Sep 2006
Posts: 904
Location: .
Expertise: Just starting

Espresso: Machine now fixed ;o)
Grinder: None
Vac Pot: None
Drip: None
Roaster: None
Posted Sat May 24, 2014, 12:22pm
Subject: Re: Constant Steam from OPV / Safety Value? (Isomac HX)
 

It may be that some tiny specks of contaminant from the boiler got into the valve as a result of it being activated.  

They are very simple devices with a spring loaded piston with a slightly flexible washer  that presses against an opening from the boiler. Not sure what the washer is made of - some sort of synthetic rubber I'm guessing.  The ones I've dealt with are designed not to be dismantled or parts replaced - probably for good safety reasons - but they can be cleaned.

There is  no adjustment on them to worry about. They are pre-specified as to release pressure by the manufacturer (it should be marked on the valve).  

Giving it a careful clean and making sure there are no particles inside stopping it from seating properly is likely to fix any remaining minor problem I reckon.
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