How to eliminate the rumble of a radiator at night? What could be the reason?

New season, old problem and I`ve had enough. Almost every other night I wake up to the sound of a roaring radiator. Sometimes it stops on its own after a minute, sometimes I have to get up and turn it off. Can something be done about it? What is the reason for this?



In the link how it sounds

What kind of installation, steel pipes, plastic? Cast iron, aluminum, panel radiator?
And what valves? Maybe they are causing this sound, or there is some contamination in them.
I once heard a radiator making a terrible humming noise, caused by a patch of rust in front of the valve.
Tell us what connection you have, a regular old valve/faucet, head, bottom, side?

At the moment I can only post a photo of what it looks like, I would have to ask the owners about the rest to be sure.

https://pl.wikipedia.org/wiki/Kawitacja
Sometimes it is enough to replace the valve or orifice with a different type with a differently shaped channel. The sounds are generated within the radiator itself, or do they travel through the pipes, e.g. from around the stove? Often, the narrow channels of a heat exchanger favor such resonance.

I`m almost convinced that it`s only within the radiator itself, unless it`s still very muffled, but I don`t think so. I`ll read and see what I can do on my own

When I heated up the water in the stove (gas stove), it started to rumble.
I had everything closed except for one radiator.
The pressure gauge on the stove was going crazy - it was jumping.
I`m not sure if this is some way of warning against some phenomenon.
I once heard from a plumber what happens when the "radiators are on" but it was 20 years ago and I don`t remember what happened.

I once had a similar phenomenon - although in my case it was more knocking than rumbling. The cause was a poorly connected thermostatic valve - the water circulation was in the opposite direction than the principle of operation of the valve; under certain conditions, the water flow pressure "equalized" the force of the spring in the valve and the valve needle jumped.

This sound in the link is not a rumble, but some vibration. Something is probably vibrating and generating this acoustic effect. It may be the poppet in the valve, or maybe the radiator itself. Is the radiator well mounted on the wall or does it hang "on pipes"? For example, opening the valve in front of the radiator to max. causes these vibrations to disappear? Unfortunately, this photo does not show the radiator connection (supply and return branches), so it is difficult to tell.

Buddy, remove the valve head, if that doesn`t help, it`s probably the valve that needs to be replaced. Regards.

Check which pipe heats up first after unscrewing the radiator.

not the valve, but the valve insert, because it makes a difference if we are looking for a new one to replace it.
But the sound is new to me and I`ve never heard anything like it.
First, I would check whether there is also such a sound after unscrewing the head all the way.
Additionally, I would play with the initial adjustment on the valve insert after removing the head, because maybe it will change something and there will be no need to replace anything.
Maybe the initial adjustment is turned too tight and something is stuck, hence the sound effect.
I have no idea, but first I would try to do what I wrote above, because it is a non-invasive intervention and does not require any draining of the water in the heating system.

A strange resonance indeed.
As the previous speaker said, the photos show that you have a bottom connection, there are probably valves in it with a flat-head screwdriver, it`s not a big deal, try moving it a little to see if there is a difference and remove the heads, then you will always have a large flow, you can unscrew it with your fingers - probably. Alternatively, after removing the head, you will also have to pre-adjust the valve, play with them and see what happens