Is it okay to fit a TRV horizontally at the bottom inlet of a radiator
The packaging says it's okay to do so if the valve is fitted to the to inlet. The normal orientation for this valve is vertically in the botto inlet.
Can the lockshield valve also be fitted horizontally in the botto outlet?
Thanks for any hel
-- chopsaw
Can't see it makes any difference. I've got two fitted horizontally to bottom edge (outlet in my case) from a radiator. Make sure the flow direction through the valve matches the arrow on the valve body, although I think most are bidirectional nowadays.
Yes if it has interchangable connections (often they don't).
TRVs
Most of mine aren't (10 years old). A couple of newer ones are.
Different manufacturers might have different installation requirements of course, but at least newer Danfoss TRVs can be mounted either way, in both flow directions :
They are (in theory), but when I recently got one set of rad connections back to front, I found having the TRV on the drain side resulted in it "whistling" and hissing a bit. (This was a Pegler Terrier II IIRC). So had to swap it over since it was a bedroom radiator.
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