As this is a slightly different topic, I thought I'd start a new thread.

After me thinking that the radiator was noisy, but subsequently found
that by turning the trv slightly, the noise or vibration stops.

Now, I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops. Also when doing this I could here a slight
hissing noise either in the pipe or trv, and when a slightly turned the
trv control, both the noise or vibration, and the slight hissing stopped.

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

Bob H wrote:

I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops.

Do you mean the head (plastic) rather than the body (metal)?

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

As you gradually close the valve, the water is forced through a smaller
hole, so the sound will change.

On 14/10/2014 09:12, Andy Burns wrote:
Bob H wrote:

I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops.

Do you mean the head (plastic) rather than the body (metal)?

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

As you gradually close the valve, the water is forced through a smaller
hole, so the sound will change.




Yes,I do mean the head, not the body.

Bob H wrote in
:

On 14/10/2014 09:12, Andy Burns wrote:
Bob H wrote:

I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops.

Do you mean the head (plastic) rather than the body (metal)?

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

As you gradually close the valve, the water is forced through a smaller
hole, so the sound will change.




Yes,I do mean the head, not the body.


The slightest movement at the cut-off stage will make a difference. Water
is possibly being forced through a gap of a few thousands of an inch.

On 14/10/2014 08:53, Bob H wrote:
As this is a slightly different topic, I thought I'd start a new thread.

After me thinking that the radiator was noisy, but subsequently found
that by turning the trv slightly, the noise or vibration stops.

Now, I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops. Also when doing this I could here a slight
hissing noise either in the pipe or trv, and when a slightly turned the
trv control, both the noise or vibration, and the slight hissing stopped.

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

I get this occasionally in a pressurised system and it has always been
cured by bleeding the offending radiator.

In message ,
DerbyBorn writes
Bob H wrote in
m:

On 14/10/2014 09:12, Andy Burns wrote:
Bob H wrote:

I have found that just by lightly squeezing? the body of the trv
the noise/vibration stops.

Do you mean the head (plastic) rather than the body (metal)?

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to
a stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

As you gradually close the valve, the water is forced through a smaller
hole, so the sound will change.




Yes,I do mean the head, not the body.


The slightest movement at the cut-off stage will make a difference. Water
is possibly being forced through a gap of a few thousands of an inch.

Or it might just be that holding/squeezing the head is damping the
sound?

--
Chris French

Our studio has a radiator like that, we call it hissing sid.
My guess is that its turbulance in the hot water squeezing by the valve or
tap or whatever is adjustable.
It needs a very delicate touch to get it just right!
Brian

--
From the Sofa of Brian Gaff Reply address is active
"Bob H" wrote in message
...
As this is a slightly different topic, I thought I'd start a new thread.

After me thinking that the radiator was noisy, but subsequently found that
by turning the trv slightly, the noise or vibration stops.

Now, I have found that just by lightly squeezing? the body of the trv the
noise/vibration stops. Also when doing this I could here a slight hissing
noise either in the pipe or trv, and when a slightly turned the trv
control, both the noise or vibration, and the slight hissing stopped.

I also found that the slight hissing sound changed in sound level as I
turned the trv control, and the more I turned it the sound decreased to a
stop.Conversely the more I turned the trv control the other way, the
hissing sound became more pronounced or louder.

"Brian Gaff" wrote in
:

Our studio has a radiator like that, we call it hissing sid.
My guess is that its turbulance in the hot water squeezing by the
valve or
tap or whatever is adjustable.
It needs a very delicate touch to get it just right!
Brian


Of course - the noise is caused by it beginning to close - or open so in a
way it is something that should not be avoided by turning it up or down.