Guclu,
I know the QRH says that certain items will be working but the FCOM doesn't (as far as I can see) specify what powers the avionics valves. The AEVC for instance may be working as per QRH but what about the valves themselves? They may not be powered despite being signalled by the AEVC to close.
For instance the pack #2 valve will definitely be open (power off it is open) with DC 2 off. However I don't see this as a major problem. In a smoke scenario (for example) if pack #2 were the smoke source and you don't wait the requisite time to establish if you have eliminated the smoke after turning off the #2 pack, resorting to Emerg Elec Config will ensure that the smoke stays!
Hopefully I can get in a sim tomorrow and try this Phil and report back.