The present invention relates to a limit switch for the valve, work for installing presented through the inside the case is installed at the top of the actuator for operating the disc and connected to the stem of the valve shaft and, by installing the operation shaft projecting to the upper side of said case and the indicator for the opened and closed states of the valve can be checked visually, in the opening and closing of the valve installed in the operation shaft of the casing located inside the casing on the valve limit switches for being constituted by operation applied to the controller to an electrical signal .;
Installing the operating unit, the operating axis open load in contact with the open terminal and the closed terminal of the switch is installed in the one side of the case in an intermediate position so as to apply an electrical signal to open and close state of the valve to the controller of the control room, and closed to load and, the open rod and the closure rod, the contact to the open hole and the closed hole and the screw formed to the through opening in a direction perpendicular to binding to the operating shaft axis, and in contact with the front end of the open and closed load has open and closed terminal having a tip and a rear end of the open and closed rod to form an adjustable head so as to close and leave the open and closed loaded into open and closed terminal direction, exactly the opened and closed states of the valve that can be applied to the indicator and the controller as well as it has the characteristics to be able to simplify the structure of a limit switch.