Hi Simon and Mr Tore,
Great images... I believe I may need to do some major changes to this Skizzenbuch section with all the latest drawings. It looks like the gate valves in this set of drawings has access for the change-over through the wooden deck doors. Again, I don't believe there is room for a hand-wheel to be installed on these gate valves...
(37096971424_5f62d20993_o) - this drawing sort of compares to the attached photo of U-201. If you look at the RED circled area there is a hole in the deck. During the change-over to the water ballast configuration the FBT 2 and FBT 4 gate valves must be opened (access through the wooded deck doors)?
What does this mean for the drawing for U - 1308 and the metal plates with holes to change the gate valve configuration?
However, the header tank water pressure to FBT 2 and FBT 4 must also be cut-off. Could the round holes in the deck be the access point to change-over the header tank water pressure selector valves? I remember the photos of the Type IX/C U-534 had the selector valves under the deck with what looked like there was plenty of room to install a hand-wheel, but there was none to be seen...
Regards,
Don_