Abstract: A device for emergency operation of pneumatic or hydraulic actuators. For normal operation of the actuator, an operation cycle includes at least a proportional valve for switching to different operational conditions of the actuator and related engine components. The proportional valve is arranged in a supply line of pressurized liquid/gas and in a drain line connected to a tank, and control means for operation control and supervising functions. An emergency cycle is attached to the operation cycle of the actuator which is provided with: at least one solenoid valve for initiating an emergency operation impulse in case of detected failures; a plurality of pneumatically/hydraulically operated switch valves which may be activated through said impulse of an emergency signal from said solenoid valve; and whereby the emergency cycle is adapted to bypass said proportional valve in emergency situations and to either block said actuator in its actual position or to bring said actuator in a predefined safe position.

Abstract: A mechanism (1) for switching at least two hydraulic tie-in points (5, 6, 7) between at least two switching positions includes a tie-in plate (2) and a switching plate (3). The tie-in plate (2) has at least two tie-in points (5, 6, 7). Each tie-in point (5, 6, 7) includes a flow opening (8) that penetrates the tie-in plate (2). Using fastening elements (4) the switching plate (3) can be fastened to the tie-in plate (2) in the at least two switching positions. The switching plate (3) has at least one recess (13) on its inside (12) and the inside (12) faces the tie-in plate (2) when mounted. In at least one of the switching positions the recess (13) connects at least two flow openings (8) of the tie-in points (5, 6, 7) with each other.