Actuator for operating a valve

An actuator for operating a valve, comprising:

• a drive component;
• a drive shaft, which is connectable with the valve;
• a torque lock, which is connectable with said drive shaft;
• a ring-shaped housing;
• at least one entraining element on said drive component, said at least one entraining element has the form of a portion of a hollow cylinder having two radial end regions;
• and
• at least one block piece on said drive shaft, and extending radially outwardly from said drive shaft, said at least one blocking piece composed of portions of cylindrical surfaces having two radial boundary surfaces as end regions, wherein:
• said torque lock includes a wrap spring as essentially a rotationally symmetric spring element arranged in said ring-shaped housing, said wrap spring having two ends;
• said torque lock is so constructed that a torque introduced via said drive component rotates said drive shaft, and a torque introduced via the valve blocks rotation of said drive shaft;
• the two ends of said wrap spring are so embodied and arranged that they engage said two radial end regions of said at least one entraining element, in the case of an introduction of the torque via said drive component, so that said torque lock is unlocked and said drive shaft rotates;
• and
• the two ends of said wrap spring engage said two end regions of said at least one blocking piece so that, in the case of an introduction of the torque via the valve, the end regions of said at least one blocking piece interacts with the two end regions of said wrap spring that said torque lock blocks.