Overflow device comprising energy-saving heat exchange valve body assembly

The utility model relates to an overflow device comprising an energy-saving heat exchange valve body assembly. The overflow device comprises an overflow machine, a heat exchanger, a high-temperature water tank, a medium-temperature water tank, a high-temperature steam inlet and a cooling water inlet, wherein both the liquid inlet end and the liquid outlet end of the overflow machine are connected with the heat exchanger so as to form a self-circulation loop, and the high-temperature water tank and medium-temperature water tank are connected with the heat exchanger through the energy-saving heat exchange valve body assembly. The energy-saving heat exchange valve body assembly is used, so that the overflow device is simple in structure, small in occupied space and capable of achieving automatic control.