FM is between parties to a contract. FM clauses allocate the risk of unforeseen events to the parties as per the language in the contract.
If FM is in play at all, it would probably protect the manufacturer by relieving it of its promise (if any) to provide the valves.
Note, I have no idea how contract law works in Italy or the EU.
However, in this case, there is probably an Italian or EU law that shields the hospital from liability. Especially if the hospital is part of a government health system. (The US has such laws)
Rough translation: Cannot punish someone for something if he did it to save himself or others from a grave damage, due to a danger he did not cause voluntarily, and not avoidable in other ways, if the thing done is proportional to the danger
Plus lets be honest (not sure if civil law still has jury trials), NO jury, not even if they imported a single person from several random countries would convict them. Not a single one.