Good morning Tony,
I tried your suggestion. When I move a valve from an existing pipe to a newly drawn one, the move goes perfect. The valve gets a place on the pipe and the pipe is interrupted for the full length of the valve. Supprisingly the valve changes color after the move (from white to green). Witch can be correct because according to the template setting a valve comes with color set bylevel and the levelcolor = green.
Does this give you any hints on what is going wrong with the conversion?
Kind regards.