Abstract: This invention is an actuator having the function of control operation displacement. The invention comprises of cylinder (100), pistons (160), a rotating axis (140) rotatably mounted through the wall of the cylinder (100), a power transmission unit (120, 130) connected between the piston (160) and the rotating axis (140), the flow pathways (11, 12) connecting the first and the second space (101, 102) to the exterior solenoid valve (20), a magnet (231) provided on one side of the piston (160), a guide (211) provided on one side of the cylinder (100), a slider (213) being guided by the guide (211) and moving reciprocally along the piston (160), a magnet sensor (235) adjacent to the wall of the cylinder.

Abstract: The invention is an actuator with simple means for a manual operation in case of emergencies. The invention is an actuator comprising a cylinder (100) in which the 1st fluid pathway (103) and the 2nd fluid pathway (104) having the different course are formed on the wall (110) of the cylinder (100); pistons (160) positioned in said cylinder (100) the 1st fluid pathway (103) and the 2nd fluid pathway (104); and the power transmission units (120, 130, 140) connected to one side of piston (160), and a pathway (210) is provided in the cylinder (100) to communicate the 1st space (101) with the 2nd space (102) in the cylinder (100), and on one side of the pathway (210) is provided a hole (212(, to cross the pathway (210) through which a valve (220)9 is engaged to open or close the pathway (210).