The subject of the present invention is an
actuator for
control valves and / or shut-off devices with an actuating element acting on a closing or opening element, in which the actuating element comprises a push or pull rod (20, 21), which is in drive connection with the axially movable part of an
electromagnetic drive unit designed as a moving coil from a
magnet coil (3, 4) and a cylindrical solenoid
plunger (1) and is moved into its inoperative position by a resetting spring (15) and is held in that position. To make it possible to use such an
actuator instead of the prior-art
electric motor, pneumatic or hydraulic drives, provisions are made for the respective actual positions of the actuating element (20, 21) to be detected by an electrical or electronic position controller (36) and transmitted to an electronic actuating
amplifier (35), which sends an
operating voltage, which is necessary for actuating the actuating element (20, 21) and can be varied between a minimum and a maximum, to the moving coil (3, 4) when a command
signal (BS) is present, until the position controller (36) signals the position of the actuating element (20, 21) as feedback, which is preset with the command
signal (BS).