[pnw_hazor]

In the US:

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)