DESCRIZIONE
The invention relates to a control device for an apparatus, for example, a gas or steam turbine valve or in general a process fitting for controlling a process fluid, comprising an electric actuating drive and an emergency actuation device for resetting the apparatus in the event of a malfunction by means of an actuator. The emergency actuation device comprises an energy accumulator, the stored energy of which is used to reset the actuator. According to the invention, a piston is associated with the energy accumulator and is subjected to the pressure in a pressure chamber in order to charge the energy accumulator, said pressure chamber being connectible by a control valve to a tank or the like such that the piston is displaced by the energy accumulator, which discharges itself. The piston interacts with the actuator of the actuating drive in order to displace said actuator in the resetting direction.