Device for automatic control temp. of fluid in pipeline

The utility model relates to a device for automatic controlling temperature of fluid in a pipeline, which is an automatic temperature controlling device which can automatically regulate the flow rate according to the fluid medium temperature of a pipeline. The utility model is characterized in that a disk face of a valve cover is provided with a magnetism conductive pointer and a temperature and a through flow area scale marks, one end of the magnetism conductive pointer is fixedly arranged at the center of the disk face of the valve cover, and a magnetic screw or a magnetic block which can be rotated with a valve clack is arranged under the disk face of the valve cover corresponding to the other end of the magnetism conductive pointer. The utility model can be used for directly observe the coincidence relation of the temperature change and the flow rate of the medium. The socket has the advantages of simple structure and convenient operation.