TRV's and Lockshields which way round

Hi as I've had so much help from this site thought I would ask, next
week I'm installing a magnaclean to my central heating so while doing
it I thought I may as well install TRV's then I thought may as well
install a few new radiators and then lockshields to go with it, funny
how the list gets longer and longer...
My question is which side does the TRV need to go on and which side
does the lockshield need to go, the reason I ask is that both valves
at present look the same. Also how do I tell which is which.
Reply to
In article , Olly writes:
I put the TRV on the outlet/return on the basis that the pipe is cooler and would interfere with the TRV's operation less. Make sure the TRV supports the direction of flow you will be using (I think most are bidirectional nowadays, but they didn't used to be).
Inlet/flow heats up first.
Reply to
Andrew Gabriel
In an earlier contribution to this discussion,
Are you sure you mean TRVs (thermostatic valves) - 'cos they don't generally look like lockshields?
Ordinary hand-operated valves often have the same working parts as lockshields, with only the rotating handwheel or non-rotating cap distinguishing them. In fact, some are supplied with two tops, and can be used as either depending on which top you use. But TRVs have large-ish detachable capsules containing the thermostatic element, and the 'wet' part of the valve is operated by a pin which moves up and down rather than by rotating the shaft.
To come back to your question, the usual convention seems to be to have the lockshield on the return side of the rad, but it doesn't really matter - it will work either way round. However, if you *are* using TRVs, and if they are directional (as some but not all are) make sure that the flow goes the right way through them or they may not work properly, and will probably be noisy.
Reply to
Roger Mills
No sorry my message wasnt clear I didnt mean that the rads originally have TRV's they currently have lockshields and normal valves, oh and as for working out which direction the water flows I was having a blonde moment
Reply to
In theory. For reasons I have yet to figure out the temperatures of the pipes on our bathroom radiator swap around depending on if the boiler is firing or not. This is a fully pumped system and the pump is running all the time...
Reply to
Dave Liquorice
In message , Olly writes
If I'm fitting bi-directional flow TRVs they go on the side of the radiator that is easiest to reach to adjust, normally, but not always this is the right hand side, as I'm right handed.
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