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Old 27.03.2020, 16:42
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Radiator valve reducing temperature

Basic question, I turn the radiator valve to minimum, but it still produces too much heat. How do you adjust these things? It's one of those large manual control knobs on the radiator.
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Old 27.03.2020, 16:47
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Re: Radiator valve reducing temperature

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Basic question, I turn the radiator valve to minimum, but it still produces too much heat. How do you adjust these things? It's one of those large manual control knobs on the radiator.
Sometimes even with the valves fully closed there is heat coming off the pipes which still have some flow through them. I've not found a way to fully turn the heat off in the place.
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Old 27.03.2020, 16:53
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Re: Radiator valve reducing temperature

Can you place a picture of your knob?
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Old 27.03.2020, 17:01
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Re: Radiator valve reducing temperature

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Can you place a picture of your knob?
Please, this is a family forum...
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Old 27.03.2020, 17:03
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Re: Radiator valve reducing temperature

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Can you place a picture of your knob?
I'll try, might be a bit hard to fit it all into a single photo without panorama mode...
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Old 27.03.2020, 17:04
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Re: Radiator valve reducing temperature

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I'll try, might be a bit hard to fit it all into a single photo without panorama mode...
Just crop the thing a little, people don't like huge pictures on the forum
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Old 27.03.2020, 17:12
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Re: Radiator valve reducing temperature

Is the knob too stiff to move by hand?
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Old 27.03.2020, 18:11
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Re: Radiator valve reducing temperature

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Old 27.03.2020, 19:31
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Re: Radiator valve reducing temperature

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Basic question, I turn the radiator valve to minimum, but it still produces too much heat. How do you adjust these things? It's one of those large manual control knobs on the radiator.
It might be jammed open. I think what is common here is that pressure on a pin causes the valve to open. The thermostat provides this pressure. So removing the thermostat entirely should allow the pin to come out a bit and then the valve is closed.

In the case that it is jammed, the pin will stay depressed, and then the valve stays open. You should be able to unscrew the thermostat to check this. If it is stuck, there are various youtube videos, etc, of how to unstick the situation - tapping, twisting the pin with pliers, and so on.

Once the valve is confirmed unstuck (and off, in the no-pressure condition), you can decide if the thermostat is the problem. If so, there are various replacements from simple thermally sensitive metal bars to zigbee/zwave enabled remote actuators.
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Old 27.03.2020, 19:58
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Re: Radiator valve reducing temperature

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It might be jammed open. I think what is common here is that pressure on a pin causes the valve to open. The thermostat provides this pressure. So removing the thermostat entirely should allow the pin to come out a bit and then the valve is closed.

In the case that it is jammed, the pin will stay depressed, and then the valve stays open.
Unfortunately this is incorrect. The pin is depressed to close the valve, so removing the head unit allows it to fully retract, which leaves the valve wide open.

The rest of the info about unsticking it is valid, but is used to fix a non-opening valve, of which I find two or three every season. The valve pins sometimes get a deposit that jams them and needs to be cleaned off carefully.

None of which is relevant to Phil's question though, which should not be possible with a thermostat head unless the mechanics of the thermostat itself are broken, such that it's no longer putting any pressure on the pin.

Edit: I should point out that this is true of the 30+ year old valves in our French house, the various replacements or additions I've fitted over our 20 years there, and of the brand new system in our Swiss house, so I'm fairly confident that this is the way they all work.
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Old 27.03.2020, 21:04
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Re: Radiator valve reducing temperature

If you do a circumcision (remove the knob) on the valve, you can use a screwdriver or whatever to fully press down the metal pin, this should seal of the flow, if not than the valve is defunct. If yes than the problem is in the know, if they are old they might have worn off some failing to close of the flow completely (just like in real life)
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Old 27.03.2020, 21:34
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Re: Radiator valve reducing temperature

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Can you place a picture of your knob?


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If you do a circumcision (remove the knob) on the valve, you can use a screwdriver or whatever to fully press down the metal pin, this should seal of the flow, if not than the valve is defunct. If yes than the problem is in the know, if they are old they might have worn off some failing to close of the flow completely (just like in real life)
a circumcision = remove the knob. Nope. But let's not get too clinical.

OP: You should not turn it off completely but set it on "anti-freeze". It will turn cold as well eventually. That's how it is with the only radiator I have in the downstairs room of my flat.
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Old 27.03.2020, 21:38
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Re: Radiator valve reducing temperature

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a circumcision = remove the knob. Nope. But let's not get too clinical.
Yeah I know, but did not want to go as far as to look up if there was a medical name for removing only the knob :P
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