Hydraulic unit

A method for supplying up to at least two hydraulically driven devices (4, 5), in particular hydraulic rescue devices, with hydraulic fluid (10) by means of a hydraulic unit (1) with at least two pressure connections (2, 3), in which in a first hydraulic circuit (8) with a first pump arrangement (12) by means of first fluid lines (20, 21) the volume flows from at least two first pump elements (13, 14) are combined and directed to a first pressure connection (2) and in a second hydraulic circuit (9) with second pump arrangement (15) by means of second fluid lines (23, 24) the volume flows of at least two second pump elements (16, 17) are combined and directed to a second pressure connection (3), wherein the first pump elements (13, 14) and the second pump elements (16, 17) are driven at the same time by a common drive (18), and wherein for the required allocation of the volume flows to the pressure connections (2, 3) by means of a first valve switch (26) at least one of the first fluid lines (21) is connected via a first connecting line (27) to a second fluid line (24) in the second hydraulic circuit (9) and by means of a second valve switch (28) at least one of the second fluid lines (24) is connected via a second connecting line (29) to a first fluid line (21) in the first hydraulic circuit (8), wherein the valve switches (26, 28) are moved by means of a spring (30, 31) into an initial position and a switching process of the first valve switch (26) is performed by a first actuator (32), which is controlled by a first control line (34) coming from the first hydraulic circuit (8) or from the second hydraulic circuit (9) and running to the first actuator (32), and a switching process of the second valve switch (28) is performed by a second actuator (33), which is controlled by a second control line (35) coming from the second hydraulic circuit (9) or from the first hydraulic circuit (8) and running to the second actuator (33).