The expansive valve is used for vapor compression type refrigerating device, the left end and the right end of the valve each have a temp. sensing system, valve body has an always opened liquid inlet and one or more liquid outlet, the opening of which is adjusted by a slide valve core, the slide valve core is connected with left and right air chambers through a linking and limiting shaft, depending on temperature difference sensed by the temperature sensing system the slide valve core displaces in the valve body and adjusts the opening of the liquid outlet. The expansive valve features large regulating range, automatic control of working state of refrigeration and simple structure.