A LIMIT SWITCH FOR VALVE

摘要

PURPOSE: A limit switch for a valve is provided to accurately display the opening and closing state of a flow path hole when the disk of a valve completely opens or closes the flow path hole and apply the displayed results to a controller. CONSTITUTION: A limit switch (100) for a valve comprises an actuating shaft (104), an indicator (105), and an actuating part (110). The actuating shaft is installed inside of a case (103) installed on the top of an actuator for operating a stem connected to the disk of a valve. The indicator is installed on the actuating shaft protruding from the case and enables an operator to visually confirm the opening and closing state of the valve. The actuating part applies an electrical signal that indicates the opening and closing state of the valve to a controller and comprises an opening cam (114) and a closing cam (115). The opening and closing cams touch an opening terminal (112) and a closing terminal (113) of a switch installed inside the case and apply the electrical signal to the controller. [Reference numerals] (AA) Open