Radiator expansion noise after valve replacement

Goodhap

I copied the title from a post from years ago because I'm having the exact same issue!

Long story short, we had leaks in several of the intake valves, so we had them replaced. The guy did a great job, but after the replacement, one of the pipes by the valve now makes really loud and annoying expansion sounds. Previously, it had never made any noise at all, and unfortunatley it's in our bedroom, so it is keeping us up at night. It's definitely not steam hitting water (we have that in some other rads, and it's intermittent and not nearly as annoying). This is like a tic-tic-tic sound that is less loud than banging but far more annoying.

Anyway, the other thread said to try putting a piece of plastic between the pipe and the wood because the pipe might have moved closer to the wood during the valve replacement, and the sound is the metal hitting that. I'm wondering if it would be OK to use a piece of cardboard instead, or if that is dangerous because of the heat of the pipe.

pecmsg

Cast iron radiator or fin tube!

Goodhap

https://forum.heatinghelp.com/discussion/comment/1885698#Comment_1885698

All cast iron

ethicalpaul

There is no risk from temperature. I have a radiator that ticks. I have not been able to solve it. Luckily my wife likes it because then she knows the heat is coming.

Jamie Hall

Cdardboard won't be hurt — but it won't help much, either. It's the slippery plastic which does the trick. Any possibility of moving the radiator just a bit so that the pipe clears the wood?

Goodhap

The cardboard does seem to have helped for the moment for whatever reason.

I've tried sliding the rad, but I will try again.

4GenPlumber

Cardboard is fine. Why not just increase the hole through the floor and put an escutcheon on to hide it? Multi-tool works great for that.

Goodhap

I pushed it back some and it has stopped for now

pecmsg

a milk bottle plastic pieces under the feet.