The utility model discloses a direct current transmission change of current cooling system for valve, including being used for the pure water refrigeration cycle return circuit to carried out cooling by the cooling device, this circulation circuit includes first valve, pure water cooling water pump, air cooler and the heat exchanger of establishing ties with quilt cooling device, the heat exchanger is equipped with hot collateral branch way and cold side branch road, and its hot collateral branch way concatenates in pure water refrigeration cycle return circuit, and its cold side branch road concatenates in outer refrigeration cycle return circuit, and outer refrigeration cycle return circuit includes second valve, outer cooling water pump and the refrigerator of establishing ties with the heat exchanger. The utility model discloses a direct current transmission change of current cooling system for valve passes through heat exchanger transmission with the refrigerating output of refrigerator and to the pure water circulating system of interior cold in, further strengthens the cooling effect, only uses the air cooler can't be with primary cooling water refrigerated problem when having solved extreme high temperature, in addition, this system's operation in-process does not have the loss of any water, has solved and has consumed the big difficult problem of the water yield when using the cooling tower.