Have fitted quite a few of these
http://www.screwfix.com/prods/13103/...all-Valve-15mm
and always have been able to arrange them so that the handle will gravity to
'off' .
The valves have a flow direction arrow cast into the body and the handle is
not reversible.
I now have to fit one where the flow will go against the directional arrow
or the handle will drop to 'on'.
From what I can see this will not matter but opinions or experience would be
V much appreciated.

Many thanks,

Nick.