System for performing fluid administration on a patient comprising: - a hydraulic pump (1), - a system for distributing liquid (2) connected to said pump (1), such that liquid can flow from the distribution system liquid (2) to the pump (1) and vice versa, - means for supplying liquid (3) for supplying liquid to a patient (4) through said dispensing liquid (2) and said pump (1), - a patient line (5) adapted to connect said dispensing liquid (2) to a patient (4), characterized in that said dispensing fluid (2) comprises two hub chambers (7 , 8) different which are separated by a space, the first chamber including coupling (7) at least one supply port liquid valve means (9) for a patient port with valve means (10 ) and corresponding input the pump (26), the second hub chamber (8) at least one patient port (18) or warmer port (19) with means corresponding valve and a pump outlet (27), further said system comprising control means arranged to close said patient port (10) of the first hub chamber (7) when said liquid supply port (9) is open or vice versa.
