An injection valve for injecting a liquid includes an electromagnetic actuator and a movable valve needle and a valve closing element that with a valve seating surface forms a sealing seat, and includes a perforated disc situated downstream from the sealing seat, the perforated disc having at least one inlet area and at least one outlet opening. The method includes initially connecting one or more non-evaporative cooling units to a data center as primary cooling plants, obtaining a government-issued water permit, and after obtaining the government-issued water permit, transitioning primary cooling for the data center to one or more evaporative cooling towers. The material is applied and directed to pass through an exciting medium such as a plasma. A speech rate converting processor determines whether or not a selected speech signal of a decoded and selected program which has been outputted from a speech signal decoder has already been subjected to a speech rate conversion process before the transmission. An improved electrical system is also described.