Fluid diverting device for an apparatus for extracorporeal treatment of blood, wherein the apparatus comprises: a blood treatment unit; an extracorporeal blood circuit coupled to the blood treatment unit and comprising a blood withdrawal line and a blood return line connectable to a vascular access of a patient; a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit; wherein the fluid diverting device is configured to be placed in-line between a blood set of the apparatus and the vascular access of the patient and comprises: - a substantially H-shaped conduits assembly comprising a withdrawal conduit, a return conduit and at least one bridging conduit (25, 125) connecting or configured to connect the withdrawal conduit to the return conduit; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line, wherein the return conduit is connected or connectable upstream and downstream to the return line; - a plurality of valves (26, 27, 28, 29, 30, 32) or distributors (201, 202) operating on the withdrawal conduit, on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient; characterized in that at least one of the plurality of valves (26, 27, 28, 29, 30, 32) is a rotating clamp, wherein the rotating clamp comprises a rotating body and an abutment element; and in that at least two valves of the plurality of valves (26, 27, 28, 29, 30, 32) comprise one common rotating body and respective abutment elements. a blood treatment unit; an extracorporeal blood circuit coupled to the blood treatment unit and comprising a blood withdrawal line and a blood return line connectable to a vascular access of a patient; a blood pump configured to be coupled to a pump section of the extracorporeal blood circuit; wherein the fluid diverting device is configured to be placed in-line between a blood set of the apparatus and the vascular access of the patient and comprises: - a substantially H-shaped conduits assembly comprising a withdrawal conduit, a return conduit and at least one bridging conduit (25, 125) connecting or configured to connect the withdrawal conduit to the return conduit; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line, wherein the return conduit is connected or connectable upstream and downstream to the return line; - a plurality of valves (26, 27, 28, 29, 30, 32) or distributors (201, 202) operating on the withdrawal conduit, on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient; - a substantially H-shaped conduits assembly comprising a withdrawal conduit, a return conduit and at least one bridging conduit (25, 125) connecting or configured to connect the withdrawal conduit to the return conduit; wherein the withdrawal conduit is connected or connectable upstream and downstream to the withdrawal line, wherein the return conduit is connected or connectable upstream and downstream to the return line; - a plurality of valves (26, 27, 28, 29, 30, 32) or distributors (201, 202) operating on the withdrawal conduit, on the return conduit and on the at least one bridging conduit and configured to divert a flow of liquid and/or blood without disconnecting the patient; characterized in that at least one of the plurality of valves (26, 27, 28, 29, 30, 32) is a rotating clamp, wherein the rotating clamp comprises a rotating body and an abutment element; and in that at least two valves of the plurality of valves (26, 27, 28, 29, 30, 32) comprise one common rotating body and respective abutment elements.