Radiator Valve

RobertDrake

Hello everyone.

I recently moved into a house with hot water radiators. All but one works just great, but this last one doesn't get warm. Having looked at the other radiators, I suspect this valve is simply closed, but I'm having a hard time figuring out how to get it on. I know it's likely just stuff, but before I go twisting the thing apart could someone confirm I just need to spin the nut (the one that has most of the paint removed in the photo).

Thank you
~Robert

JUGHNE

The screwdriver slot is to move the internals of the valve.
You might clean the slot as it looks locked in paint.
Some PB Blaster applied to the screw and nut might help.
A brass brush may help clean up the paint.
(the stuff smells bad BTY).

You need a proper sized screwdriver that matches the slot.
Sometime the nut needs to be loosened a half turn.
The slotted part may turn either way... or not.
When the slot is lined up with the pipe it is fully open.
Snug the nut up afterwards, just enough to stop any drips.

This can be adjusted to control the flow, a little closing goes a long way in cutting down the flow.

You may have to bleed air from the rad also as if being off it may have accumulated air from the other connection.

RobertDrake

Very helpful, thank you!