Blocked Radiator Return Valve: How to Unscrew & Fix

Question

Hello,

One of the radiators does not heat up in my apartment. They have all been vented and the valves are opened.
I assume the return valve is closed or blocked. I am asking for advice on how to unscrew it or what I can try to do.

The inner screw is unscrewed to the point of no water leakage, with further loosening, water begins to flow out.

Should I unscrew it completely to turn it further with the Allen key?

IMG_201811...190259.jpg Download (1.14 MB)

SKM 1964 · Answer

If it is a stone, it is only demolition. Maybe it's clogged up with other rust type muck. It can be otherwise. Open the flow to MAX. and tap it gently with a hammer. It helps more than once and you do not need to remove the valve.

dalkus · Answer

This is the first season for this radiator. I picked up the apartment in March and it's only now coming out. However, unscrewing the valve only consists in unscrewing this screw? Is it another activity? Maybe I have to do something with this square brass piece? IMG_201811...259 -2.jpg Download (528.34 kB)

SKM 1964 · Answer

It turns out that the screw is the vent, and the square is the closing of the valve. Or I am wrong and this screw was used to attach the knob to this square. Try to unscrew this square a bit and the valve will recreate. I do not hope so. I also have bottom valves on the radiators in the building, but a bit different for the hexagon. After unscrewing them, water flows.

dalkus · Answer

I also have an air vent on the top of the radiator. I can't grab this square, I tried it with a socket wrench, but it has a strange dimension of ~ 5.5 mm. It is impossible to twist it with pliers, although it is actually slightly movable. I can move it ~ 5 degrees left to right. I still have resistance.

SKM 1964 · Answer

And try to pull back first and then twist. like the radiators with the upper valve ?? Danfoss does.

Added after 3 [minutes]:

In fact, it looks like an ordinary valve set up in order to breakdown or better vent the radiators. After closing the upper and lower valves, you can remove the radiator with the stove working, and the rest heats up.

ta_tar · Answer

A similar topic was here: Maybe he'll explain something. There is also a link that may explain something.

Blocked Radiator Return Valve: How to Unscrew & Fix

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