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Old 10-25-2010, 06:57 PM   #1
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Valve on Castiron radiator




Trying to change this valve but soon as I unloosened the nut water started coming out. I bled the radiator first and the heat is off of course.

Any thoughts?

Thanks in advanced!

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Old 10-25-2010, 08:14 PM   #2
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Valve on Castiron radiator


You need to shut off water to the heating system
If this is on the 1st fl & you have a 2nd floor water from the 2nd floor will drain to the 1st fl

You probably need to drain the system part way

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Old 10-25-2010, 09:55 PM   #3
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Valve on Castiron radiator


It's on the second floor...
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Old 10-28-2010, 11:04 PM   #4
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Valve on Castiron radiator


I have never worked with radiators, but unless the water was let out at a lower point with the bleed valve on the radiator open I would think a few gallons of water would remain in the radiator.
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Old 10-28-2010, 11:28 PM   #5
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Valve on Castiron radiator


Any possibility it can be a hot water system and not steam? Can you post a pic of the entire radiator? My Victorian in Chicago has hot water system and you have to drain the system to below where you are working. Then re-fill.
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Old 10-29-2010, 12:24 PM   #6
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Valve on Castiron radiator


Yes it's a "Hot Water" system.
It's the radiator in the middle room on the 3rd floor not the 2nd.

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Old 10-29-2010, 12:51 PM   #7
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Valve on Castiron radiator


Fun and excitement. You will need to drain the water level to at least below the floor in order to change this valve. Open the drain on the boiler with a hose on it to the nearest drain. Open the valve at the boiler and by the time you get to the highest radiator open the bleed valve. You will hear air rushing in. You will need to periodically check the bleed valve on that radiator needing repair until it no longer has water coming out and starts taking in air. I don't know if there any science to determine when level is just below floor, but valve shouldn't leak any more water of substantial quantity. Nothing a flat pan wouldn't handle.

The reason I asked if it was "hot water and not steam" is hot water system sometimes has a bypass pipe along the side of radiator. I only have one in my house with connections both on the bottom.

Every time I had to do something to our system I had to drain the entire thing...
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Last edited by ChrisDIY; 10-29-2010 at 12:57 PM.
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Old 10-31-2010, 08:30 AM   #8
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Valve on Castiron radiator


To speed the draining process, open the air valves to all the radiators on that floor (and higher floors).

Draining the system partway means draining all of these completely.
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Last edited by AllanJ; 10-31-2010 at 08:32 AM.
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Old 10-31-2010, 04:30 PM   #9
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Valve on Castiron radiator


Ok took all the useful info, got the new valve on but now the problem is the old bolt is not connecting well with the new valve?

How do I get the old one off??

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Old 10-31-2010, 06:00 PM   #10
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Valve on Castiron radiator


You need a radiator nipple wrench, if you don't want to buy one you can cut the nut ONLY; you need something like a Dremel and then use a pipe wrench to take the nipple out, I hope that you kept the nipple and nut that came with your valve, you will need them to hook back up, those things are very rarely the same between different brands, luck.

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Old 10-31-2010, 07:39 PM   #11
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Valve on Castiron radiator


Radiiator nipple wrenches are a waste of time, they will only snap the inner tangs off the union. since you need to match the unions up and the old one is no good anyway, just use a regular pipe wrench on it. You're gonna destroy it but who cares.
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Old 10-31-2010, 09:46 PM   #12
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Valve on Castiron radiator


If you know the thread sizes are exactly the same you may have an issue with the new valve being shorter than the old one. I watched an old world plumber put a torch on the radiator for a while got it nice and hot but not enough to melt and the entire nipple came out easy. Even with a cheater this connection is probably between 50-100 years old. So good luck. Make sure you can get all the nipples and radiator parts before you go any farther. I still need a replacement 12 rail low boy hot water heater...

Quote:
Originally Posted by Carloscda View Post
Ok took all the useful info, got the new valve on but now the problem is the old bolt is not connecting well with the new valve?

How do I get the old one off??

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Old 10-31-2010, 10:27 PM   #13
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Valve on Castiron radiator



Last edited by Carloscda; 10-31-2010 at 10:30 PM.
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Old 11-01-2010, 08:11 AM   #14
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Valve on Castiron radiator


you will have to cut the not off so, you can get to the nipple
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Old 11-01-2010, 09:56 AM   #15
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Valve on Castiron radiator


Does your replacement valve have the exact same dimensions as the old one and same thread size? In order for you to take the picture both connections have been taken apart? IF it isn't the new valve is way too high if you just backed it 90 degrees. At this point I don't think you need to replace it yet. Make sure the outlet pipe and the valve are fully seated before you try and screw together. If there is any gap you are trying to slide a 200+ lbs. radiator across floor with just threads of union. Also triple check your alignment before trying to screw connection. Valve may need to be turned a degree of so/ If its equally seated then start to make threaded connection.

I took about 4 of them out to paint them and you have to have the nipple seat perfectly against valve and outlet pipe or it won't thread!!!

NOT a plumber so terminology isn't there.
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Last edited by ChrisDIY; 11-01-2010 at 10:26 AM.
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