or a 'Radiator Valve' can be used to balance DCH flow.
Apart from about 4 quid, the obvious difference to me is that the radiator connection on the LSV is external by means of spanner, and the RV is internal by allen key and the LSV appears to have a crush type copper washer to seal the valve instead of a spherical seating.
One benefit of the LSV is that it's possible to use 2 opposing spanners to prevent the threaded radiator insert from rotating when tightening the valve - whereas with a RV there's a risk of the insert moving and accidentally bending the 15mm copper pipe.
I've pretty much answered my own query but would appreciate any comments, particularly on the copper crush washer - i.e. are they one shot items that are replaced if the rad is removed?
If anyone is thinking of replacing please note that the centres appear to be the same as TRV at about 45mm from the end of the rad, instead of
35mm for a RV.