Wim Aerts,
Try and verify the actual origin point of the valves in question. The Connect Points are in relation to the cell origin point.
The XML files related to the respective cell libraries contain the actual Connect Point data. The other possibility may be that the line from PlantSpace is not really an intelligent line and is not being converted correctly. If you have made the adjustments to the Connect Points try dragging the valve off the line and then back on again and see if this fixes the line break.
If this does you could try a Key-In to regenerate all cells - "pid component redraw all" this will force a redraw of all objects in the file.
Tony DeRosa
Bentley Plant