Andy Burns <usenet@andyburns.uk> wrote:

Tricky Dicky wrote:

My question is how much movement should there be in the
valve stem it protrudes approximately 3mm above the valve and there is
about 2mm of movement, is this normal

On a spare Myson TRV sitting here, the protrusion is a little more, but
the movement is about the same ...

Thanks Andy the protrusion on second look could be slightly more than 3mm
as I did not measure it and it was just by eye guess. It is reassuring that
the movement is correct.

Richard

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My heating system has reported that one of the TRVs is not fully shutting
off and I have found the radiator getting warm when it should be off. I
have carried out the recommended service of moving the stem and adding some silicone lubricant. My question is how much movement should there be in the valve stem it protrudes approximately 3mm above the valve and there is
about 2mm of movement, is this normal or am I looking at replacing the
valve body?

Richard

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Tricky Dicky wrote:

My question is how much movement should there be in the
valve stem it protrudes approximately 3mm above the valve and there is
about 2mm of movement, is this normal

On a spare Myson TRV sitting here, the protrusion is a little more, but
the movement is about the same ...

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Tricky Dicky <tricky.dicky@sky.com> wrote:

My heating system has reported that one of the TRVs is not fully shutting
off and I have found the radiator getting warm when it should be off. I
have carried out the recommended service of moving the stem and adding some silicone lubricant. My question is how much movement should there be in the valve stem it protrudes approximately 3mm above the valve and there is
about 2mm of movement, is this normal or am I looking at replacing the
valve body?

Richard

Check that the TRV body is properly seated on the valve body and not cross threaded. It only needs to be off by 1mm to prevent the valve shutting
fully.

Tim

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On 16/03/2025 15:37, Tricky Dicky wrote:

My heating system has reported that one of the TRVs is not fully shutting
off and I have found the radiator getting warm when it should be off. I
have carried out the recommended service of moving the stem and adding some silicone lubricant. My question is how much movement should there be in the valve stem it protrudes approximately 3mm above the valve and there is
about 2mm of movement, is this normal or am I looking at replacing the
valve body?

Richard

That sounds like about a normal movement. Have you got a decorators cap
that you can put on it in place of the head? If so does that keep the
radiator cold? Are you sure that you have installed the head on the body correctly? Put the temperature to the highest setting, fully undo the
retaining screw ring, push down on the head to firmly to seat the head
on the body before doing up the retaining screw ring.

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