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-   -   Boiler pressure relief valve problem (http://www.diychatroom.com/f7/boiler-pressure-relief-valve-problem-166891/)

maddog1 12-19-2012 12:39 PM

Boiler pressure relief valve problem
 
I had a leaking boiler relief valve. I replaced it with the same brand valve & same pressure relief rating. However the new valve is leaking too. The only different thing I see is that the old valve is rated for 510.000 BTU Hour rating- and the new valve is rated for 550.000 BTU Hour. Can this difference cause the new valve to leak. The pressure setting on both valves is the same at 30 pounds. I hope someone can help me out on this. Can't afford the service call charge for this problem.

Thank you!

Bondo 12-19-2012 01:21 PM

Quote:

Originally Posted by maddog1 (Post 1076082)
I had a leaking boiler relief valve. I replaced it with the same brand valve & same pressure relief rating. However the new valve is leaking too. The only different thing I see is that the old valve is rated for 510.000 BTU Hour rating- and the new valve is rated for 550.000 BTU Hour. Can this difference cause the new valve to leak. The pressure setting on both valves is the same at 30 pounds. I hope someone can help me out on this. Can't afford the service call charge for this problem.

Thank you!

Ayuh,.... What is the pressure of the boiler,..??

What's the style, 'n condition of it's pressure tank,..??

maddog1 12-19-2012 02:41 PM

Hi Bondo
I just posted another thread about my problem. To answer your question, Im thinking it could be the expansion tank? It's a Fil_trol model 110, a small tank. Pre charged pressure is 12 psi. I just put a tire gauge on the air fill valve & it reads 25 psi. I don't know if that's good or bad. How do I check it further.

Also I just got a water pressure gauge. I was going to remove the new pressure valve & install the water pressure gauge & run the system & see how hight the pressure goes. The system right now does not have a gauge installed on it so I don't know how high the pressure is climbing.

I don't see any leaks at all. When the heat shuts off & get some blow off at the vfalve, not much & then it stops. Thanks for asking & for any help you can give me.

HVACTECH96 12-19-2012 03:27 PM

Sounds like bad expansion tank.Did water come out the schrader when pressure was checked?

maddog1 12-19-2012 03:38 PM

Hi- I'm not sure what a Schrader is? I assume that is the air fill valve on the tank. If so, no water came out.

Here is what I think I need to do.Shut off the water supply & open up a hot water faucet & let the hot water run out. Then bleed off the air pressure in the tank & when the air is out, if I get water out the air fill valve, I would have a bad tank? Is this how you check the tank. Thanks for you help on this. I'm not a plumber but I can help myself a little if I know I'm going the right way.

Bondo 12-19-2012 04:01 PM

Quote:

Originally Posted by maddog1 (Post 1076187)
Hi- I'm not sure what a Schrader is? I assume that is the air fill valve on the tank. If so, no water came out.

Here is what I think I need to do.Shut off the water supply & open up a hot water faucet & let the hot water run out. Then bleed off the air pressure in the tank & when the air is out, if I get water out the air fill valve, I would have a bad tank? Is this how you check the tank. Thanks for you help on this. I'm not a plumber but I can help myself a little if I know I'm going the right way.

Ayuh,... It's a tire blow-up fittin'....

Before ya go messin' with the tank,... or plumbin' another gauge,..
Doesn't yer boiler have a tridicator gauge, with temp, 'n pressure showin' on it,..??
If it don't, it oughta...
Way better than what yer schemin'....

Ya never let the air outa the tank, it's a bladder tank, 'n is pre-charged to 12psi, the normal pressure used in most boilers...

How's the Auto-fill valve lookin', 'n actin',..??

maddog1 12-19-2012 04:53 PM

Bondo- There is a gauge on the front of the boiler sheetmetal. But I need to go take a look at it. I know it shows temp. but I need to see if it also shows pressure.

The fill valve appears to be in good shape. It's one of those single lever ball valve type. I see no leaks or corroison on it. It works smooth, closes and opens nice. I will go take a look at that gauge now & then post what I find here. be back in a few minutes with another post. Than you!

maddog1 12-19-2012 05:07 PM

Bondo- I just took a look at the gauge on the front of the boiler. Right now it is showing a temperature of 150 degrees and a pressure reading of 38 psi. The relief valve is a 30 psi rating.

Bondo- what does this tell you? I can't see where the gauge is actually attached because only the face of the gauge sticks out of the sheet metal. I always thought that the gauge was reading the temp & presure of the Hot water coil. Thanks

Bondo 12-19-2012 05:17 PM

Quote:

Originally Posted by maddog1 (Post 1076244)
Bondo- I just took a look at the gauge on the front of the boiler. Right now it is showing a temperature of 150 degrees and a pressure reading of 38 psi. The relief valve is a 30 psi rating.

Bondo- what does this tell you? I can't see where the gauge is actually attached because only the face of the gauge sticks out of the sheet metal. I always thought that the gauge was reading the temp & presure of the Hot water coil. Thanks

Ok,... Need a picture of yer auto-fill,... 1/4 turn ball valve ain't it,...
more likely a red bell-shaped thingy...
'n you should have a ball valve, 'tween yer domestic water, 'n the bell-shaped thingy...

The auto-fill should only allow 'bout 12 psi into the system,...
Drain some water outa the bottom of the boiler, 'n watch the gauge, drop it to 'bout 10/ 12/ 15 psi...

That gauge screws into the block/water jacket, usually above/ near the firebox...
Cold, aka; room temp, it should show room temp, 'n 12 psi...
It'll show the current temp of the boiler, 'n maybe reach up to 15 psi, or so, when at full heat...

I'm guessin' the auto-fill, ain't auto-fillin' right...

maddog1 12-19-2012 05:40 PM

Bondo- I don't see anything like how your describing it. OK- I will get a picture or two of what I have & get them to you. This will take me a few, but I will get it done for you. After you see what I have, then we can do the water out the boiler. I will try my best. I hope you will be here a little later from now. I'm on my way now to take pictures for you. Thanks

maddog1 12-19-2012 06:05 PM

6 Attachment(s)
Bondo- Here are some photos. Hope they come in OK. They show what I have. This system is getting old. Went in new about twenty five years ago. So it could be way different today. Thanks. Got my fingers crossed on the photos. Not too good at this computer stuff.

maddog1 12-19-2012 06:20 PM

Bondo- Im assuming that what you mean by the Auto-Fill is that large rectangular body sitting directly above the expansion tank. If so that thing is plumbed on both ends into what looks like a one inch line on both ends. It is threaded onto the tube fittings, but the male threaded ends are sweated into place.

Attached by 1/2 inch pipe there is another much smaller rectangular valve that is threaded into the top of the expansion tank. Could that valve be at fault. I looked up a diagram of the part & it has a filter screen inside it as well as other parts that regulate water & whatever else. Don't fully understand how the parts work. Please let me know if you need more photos. I'm hopeing the problem is not that large body valve plumbed into the one inch lines. If so then I will need to call in my burner service to change it out. I don't have a tourch that will handle a one inch sweat joint & I've never had good luck with sweating lines that had moisture in them. Thanks Bondo. Will wait to hear back from you for my next move.

maddog1 12-19-2012 06:38 PM

Bondo- Where is Chaumont River, NY. Don't have a map right now. Sounds like western, NY. Im in the lower hudson river valley in Orange county, NY Bout 1/2 half hour from Bear Mountain & west point. Closest big area is Middletown, NY. Im only 10 minutes from the NJ border & about twenty to the Pa border. You can say we got it all down here including the Tapan Zee bridge which IS NOT ready to fall down, but it sounds good to say it so they can gouge more moeny out of us.

Maddog:thumbup:

Bondo 12-19-2012 06:44 PM

Ayuh,... Ok, in the 3rd picture, of the tank. 'n the cast iron box, 'n there's a green handled ball valve, that's open...

Where does it come from,..??
If it's line pressure, domestic water supply, the pressure is Way to high...
Shut the valve Off, 'n bleed the drain valve on the boiler to lower the pressure to 'bout 15 psi...

Donno how it coulda ever worked Right, that way...
Quote:

Im assuming that what you mean by the Auto-Fill is that large rectangular body sitting directly above the expansion tank. If so that thing is plumbed on both ends into what looks like a one inch line on both ends. It is threaded onto the tube fittings, but the male threaded ends are sweated into place.
Nope, that's just an expansion chamber to knock air outa the system, 'n the auto-bleed is the brass lookin' thing on top...
Is the rust from leakin' threads, 'n just sputter from the auto-bleeder,..??
Quote:

Attached by 1/2 inch pipe there is another much smaller rectangular valve that is threaded into the top of the expansion tank. Could that valve be at fault.
I doubt it...

Gotta get a handle on the feed water,...
Where's that ball valve in pic #3 line come from...
That's where the auto-fill valve set to 12 psi oughta be...

Bondo 12-19-2012 06:47 PM

Quote:

Originally Posted by maddog1 (Post 1076314)
Bondo- Where is Chaumont River, NY. Don't have a map right now. Sounds like western, NY. Im in the lower hudson river valley in Orange county, NY Bout 1/2 half hour from Bear Mountain & west point. Closest big area is Middletown, NY. Im only 10 minutes from the NJ border & about twenty to the Pa border. You can say we got it all down here including the Tapan Zee bridge which IS NOT ready to fall down, but it sounds good to say it so they can gouge more moeny out of us.

Maddog:thumbup:

Ayuh,.... Google it,.... I can danm near throw a rock into Canaduh...:laughing:

I'm actually sittin' just outside Watertown, my 2 river houses are where the Chaumont River, turns into Chaumont Bay...


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