Our Valued Sponsor
OpinionsConsumer ReviewsGuides and How TosCoffeeGeek ReviewsResourcesForums
Espresso: Questions and Answers
Hissing from Pressure Security Valve
Rocket R58 Double Boiler
Rocket Espresso R58 Double Boiler -  Everything you need for the perfect shot!
www.seattlecoffeegear.com
 
Not Logged in: Log In to Postlog in
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered  
Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Discussions > Espresso > Q and A > Hissing from...  
view previous topic | view next topic | view all topics
Author Messages
Whitcoatsyndrom
Senior Member
Whitcoatsyndrom
Joined: 25 Apr 2013
Posts: 178
Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
Drip: Newco-OCS 12
Roaster: HG/BM
Posted Mon Apr 21, 2014, 1:04pm
Subject: Hissing from Pressure Security Valve
 

Very long story, but I removed the pressure relief valve from atop my Expobar Pulser HX boiler.  I didn't actually remove the whole fitting, but just the top "cap" piece that allows access to the plunger and spring that would get pushed up by excessive pressure.  While I had it out I inspected the spring and plunger, it all looked fine, no cracks or deformities.  I put the three pieces back together and let the machine heat up.

Now I'm hearing a slight hissing noise coming from relief valve when it it's up to temp.  To be honest, I'm not sure if I caused the leak or if it was there when I got the machine.  I always heard a slight hiss but just assumed it was the vacuum breaker letting a little air out...but no, it's definitely the relief valve (now it is, at least).  If I press down on the tip of the plunger that is exposed (thus reinforcing the seal that is opposed by building pressure in the boiler) the hissing immediately stops.  Is this normal or should I replace the whole part?  (http://www.wholelattelove.com/Expobar/expobar-65000100.cfm)

I don't know if any of you have removed your pressure relief valves, but mine was metal-on-metal where the cone-shaped plunger tip meets the cone-shaped recess at the bottom of the fitting (the spot where pressure pushes the plunger up for relief).  Metal on metal, perhaps not the best seal?
back to top
 View Profile Link to this post
frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,436
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Mon Apr 21, 2014, 1:14pm
Subject: Re: Hissing from Pressure Security Valve
 

Which part of "Safety Valve" do I need to explain?  ;-)

Replace it. The leak will likely never go away and has the potential to increase over time. It could have been worse. It could have failed closed, the pressurestat gets stuck eventually, and  then you have a potential bomb on your counter.

 
Visit My Website
www.EspressoMyEspresso.com
back to top
 View Profile Visit website Link to this post
Whitcoatsyndrom
Senior Member
Whitcoatsyndrom
Joined: 25 Apr 2013
Posts: 178
Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
Drip: Newco-OCS 12
Roaster: HG/BM
Posted Mon Apr 21, 2014, 1:39pm
Subject: Re: Hissing from Pressure Security Valve
 

Yeah...I was afraid that would be the only option, but am so happy that didn't happen :-)

The big problem is that I can't wrench off the entire fitting from the boiler.  It screws into the same fitting that the steam tube comes out of...I'm worried that I'm heading down a path that requires removing the whole boiler.
back to top
 View Profile Link to this post
Whitcoatsyndrom
Senior Member
Whitcoatsyndrom
Joined: 25 Apr 2013
Posts: 178
Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
Drip: Newco-OCS 12
Roaster: HG/BM
Posted Mon Apr 21, 2014, 2:08pm
Subject: Re: Hissing from Pressure Security Valve
 

Update:

It took more force than I was particularly comfortable with, but I finally got through the threadlock or whatever was on there and got the relief valve off.  Time to order a new one!
back to top
 View Profile Link to this post
DavecUK
Senior Member


Joined: 21 Sep 2005
Posts: 1,460
Location: UK
Expertise: I love coffee

Posted Mon Apr 21, 2014, 2:23pm
Subject: Re: Hissing from Pressure Security Valve
 

Clean off the threadlock and use PTFE to refit...I hate the threadlocker the companies use.
back to top
 View Profile Link to this post
frcn
Senior Member
frcn
Joined: 23 Dec 2001
Posts: 3,436
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Mon Apr 21, 2014, 3:03pm
Subject: Re: Hissing from Pressure Security Valve
 

Sometimes there can be a good reason to use a thread-locking compound. For example, to get an angled fitting to properly align with a solid tube which connects to it without having to use the torque value of {stripped + 0.1}.

 
Visit My Website
www.EspressoMyEspresso.com
back to top
 View Profile Visit website Link to this post
dana_leighton
Moderator
dana_leighton
Joined: 11 Jan 2002
Posts: 1,995
Location: Fayetteville, AR
Expertise: I live coffee

Espresso: Isomac Relax; Caferina...
Grinder: Macap MXK; Baratza Vario-W;...
Vac Pot: Yama 5-cup
Drip: Technivorm; CCD; Melitta
Roaster: Poppery I w/PID controller
Posted Mon Apr 21, 2014, 3:43pm
Subject: Re: Hissing from Pressure Security Valve
 

Thread compounds differ in their strength. I use the Loxeal 18-10 that is quite easy to unscrew, yet seals well in the cases that Randy was referring to.

http://www.loxeal.com/pipe_sealing.html

 
Dana Leighton - Espresso hack and CoffeeGeek moderator
back to top
 View Profile Visit website Link to this post
Whitcoatsyndrom
Senior Member
Whitcoatsyndrom
Joined: 25 Apr 2013
Posts: 178
Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
Drip: Newco-OCS 12
Roaster: HG/BM
Posted Mon Apr 21, 2014, 5:07pm
Subject: Re: Hissing from Pressure Security Valve
 

frcn Said:

Sometimes there can be a good reason to use a thread-locking compound. For example, to get an angled fitting to properly align with a solid tube which connects to it without having to use the torque value of {stripped + 0.1}.

Posted April 21, 2014 link

That's a good point.  As I was unscrewing I thought about the necessary torque to get it back on there without a locking agent involved.  I'm not a big fan of the threadlock products just because there is a chance I'll do more damage if I try to take it off again in the future.  


dana_leighton Said:

Thread compounds differ in their strength. I use the Loxeal 18-10 that is quite easy to unscrew, yet seals well in the cases that Randy was referring to.

http://www.loxeal.com/pipe_sealing.html

Posted April 21, 2014 link

The description sounds great and avoids the problem I worry about as far as future removing.  It comes down to--I have a rolls of PTFE in the house but must order any threadlocking compound.  Are most people okay with just the PTFE for this application?

I was pretty surprised when I took off the valve to see a lack of o-ring between the valve and boiler attachment.  Again it was just metal to metal (also the case of the plunger inside the valve).  Is there a reason for this?  

Thanks for all the help, today was no fun without coffee.
back to top
 View Profile Link to this post
steamer
Senior Member
steamer
Joined: 11 Feb 2005
Posts: 901
Location: socal
Expertise: I live coffee

Espresso: Expobar Brewtus IV R
Grinder: Mazzer Mini-B Baratza...
Vac Pot: Krubs Moka Brew, vacPot
Drip: TechV, and many more
Roaster: Hottop
Posted Tue Apr 22, 2014, 6:37am
Subject: Re: Hissing from Pressure Security Valve
 

Not to seem to far fetched, but, I have seen bolier bolts that hold the endplates to the main housing, back off. thus the reason behind a thread lock as to just teflon tape. Tape and paste seals the threads, but loc-tite will help in keeping the part from unscrewing under pressure.
back to top
 View Profile Link to this post
Whitcoatsyndrom
Senior Member
Whitcoatsyndrom
Joined: 25 Apr 2013
Posts: 178
Location: Roanoke, VA
Expertise: I live coffee

Espresso: Expobar Office Pulser
Grinder: Baratza Vario
Drip: Newco-OCS 12
Roaster: HG/BM
Posted Tue Apr 22, 2014, 8:32am
Subject: Re: Hissing from Pressure Security Valve
 

Noted, you talked me into it...I'll get some loctite.  Thanks!
back to top
 View Profile Link to this post
view previous topic | view next topic | view all topics
Discussions > Espresso > Q and A > Hissing from...  
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered     Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Not Logged in: Log In to Postlog in
Discussions Quick Jump:
Symbols: New Posts= New Posts since your last visit      No New Posts= No New Posts since last visit     Go to most recent post= Newest post
Forum Rules:
No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.
No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.
No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.
No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.
Who Can Read The Forum? Anyone can read posts in these discussion boards.
Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.
Who Can Post Replies? Any registered CoffeeGeek member can post replies.
Can Photos be posted? Anyone can post photos in their new topics or replies.
Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.
Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.
Donate to Coffee Kids
Coffee Kids works with farming communities around the world, improving lives. Donate today.
www.coffeekids.org
Home | Opinions | Consumer Reviews | Guides & How Tos | CoffeeGeek Reviews | Resources | Forums | Contact Us
CoffeeGeek.com, CoffeeGeek, and Coffee Geek, along with all associated content & images are copyright ©2000-2014 by Mark Prince, all rights reserved, unless otherwise indicated. Content, code, and images may not be reused without permission. Usage of this website signifies agreement with our Terms and Conditions. (0.332556009293)
Privacy Policy | Copyright Info | Terms and Conditions | CoffeeGeek Advertisers | RSS | Find us on Google+