The Valley of the Kings actually has two components - the East Valley and the West Valley. It is the East Valley which most tourists visit and in which most of the tombs of the New Kingdom Pharaohs can be found. (The West Valley has only one remote tomb open to the public, that of Ay who was Tutankhamun's successor.)
One of the dilemmas for the normal tourist is trying to decide which tombs to enter. The normal ticket permits three tombs and that will probably suffice for one visit. If you rush, you won't appreciate or remember the details of each tomb. The tomb of Tutankhamun (KV62) requires a separate ticket.