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Posted to uk.d-i-y
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TRVs - Are the heads interchangeable?
On 2007-01-15 11:52:40 +0000, said:
I have a honeywell TRV that has been broken. Can i just replace the
TRV element or do different ones have different depths, ie if the
replaced one says 0, it won't really be on 0.
Many thanks in advance.
There is a kind of industry standard based on a 30mm threaded ring and
a plunger projecting about 5mm from teh valve base
I looked into this when replacing some Honeywell TRV heads with some
motorised ones from Sauter. I suspect that it was originally
Honeywell standard adopted by others.
However, other vendors don't all follow this because Sauter have a
couple of adaptors for other major brands.
If it's a TRV4 head you can just replace the head - they are available,
although for volume reasons, most plumbers' merchants seem to stock the
complete valves at a lower price.
If the base is OK, you don't need to replace it even so. However,
if the pin is sticky or crudded up, it may be worth swapping the base
as well.
If you are going to do that, it's worth going round the house and
checking all of them. The typical failure mode is that the valves
become "binary" in operation - i.e. all off or all on.
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