How Do I Remove The Rusty Valve From An Old Cast Iron Radiator? - Plumbing - DIY Home Improvement | DIYChatroom


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Old 07-30-2011, 12:20 PM   #1
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How do I remove the rusty valve from an old cast iron radiator?




I'm removing my 100 yr old cast iron radiators to get them dipped to remove the old paint. while they're out, I'd like to replace the valves. They're all rusted and not working. I have an 18inch pipe wrench on the valve and a 14 inch on the pipe to keep it still (see pic). The valve won't budge. Ive used WD-40 to try to loosen it. How much force can I use on the wrench? Do I risk breaking the pipe Thanks! Rob


Hi folks, here's the resolution to my problem, FYI. I put flame on the valve for about 15 sec, just enough to get it hot. Valve came off no problem after that using the 18 inch and 14 inch pipe wrenches in the pic. Note to home owners, these wrenches are expensive. If you don't have these, lots of equipment rental places rent them out. Good luck!

Jiju1943 thanks much for the advice!

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Last edited by robgettings; 08-13-2011 at 11:17 PM. Reason: update photo, resolution of problem
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Old 07-30-2011, 02:00 PM   #2
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How do I remove the rusty valve from an old cast iron radiator?


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Originally Posted by robgettings View Post
I'm removing my 100 yr old cast iron radiators to get them dipped to remove the old paint. while they're out, I'd like to replace the valves. They're all rusted and not working. I have an 18" pipe wrench on the valve and it won't budge. Ive used WD-40 to try to loosen it. How much force can I use on the wrench? Do I risk breaking the pipe Thanks! Rob
Try a torch to heat it, that may work, if it doesn't you may have to cut the pipe and rethread it.

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Old 07-30-2011, 02:10 PM   #3
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How do I remove the rusty valve from an old cast iron radiator?


I hope you're using 2 wrenches- 1 as a back up
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Old 07-30-2011, 02:52 PM   #4
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How do I remove the rusty valve from an old cast iron radiator?


Penetrating oil couple days tapping lightly with a rubber mallet(don't want to break the cast) have patience take your time it's been on there a long time.
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