A pressurized medium system, comprising at least: - an actuator or actuator unit configured to generate sum forces (Fcyl) effective on a load and in two opposite directions; - at least two working chambers operating by the principle of displacement and located in said actuator or actuator unit, the at least two working chambers including at least two predetermined working chambers (19, 20, 21, 22); - at least one charging circuit (HPi, HPia) of a higher pressure, which is a source of hydraulic power capable of both producing and receiving a volume flow at a first predetermined pressure level; - at least one charging circuit (LPi, LPia) of a lower pressure, which is a source of hydraulic power capable of both producing and receiving a volume flow at a second predetermined pressure level; - a control circuit configured to couple at least one of said charging circuits of a higher pressure (HPi, HPia) and at least one of said charging circuits of a lower pressure (LPi, LPia) in turn to each predetermined working chamber (19, 20, 21, 22); - at least one controller for control of said sum forces generated by said actuator or actuator unit; characterized in that: - the control circuit comprises, for each predetermined working chamber (19, 20, 21, 22), a first controllable control interface (9, 11, 13, 15) configured to open and close a first connection to the charging circuit of a higher pressure (HPi, HPia), and a second separate controllable control interface (10, 12, 14, 16) configured to open and close a second connection to the charging circuit of a lower pressure (LPi, LPia); - wherein each predetermined working chamber (10, 20, 21, 22) is capable of generating force components (FA, FB, FC, FD) that correspond to the first predetermined pressure level and the second predetermined pressure level of the at least one charging circuit of a higher pressure and the at least one charging circuit of a lower pressure (HPi, HPia, LPi, LPia) to be coupled to each predetermined working chamber; - wherein each force component is configured to generate at least one of said sum forces in combination with the force components generated by the other predetermined working chambers; - wherein said at least one controller is configured to control said control circuit on the basis of an input that is a guideline value for a sum force to be generated, acceleration of the load, speed of the load, or position of the load; and - wherein said at least one controller is further configured to control, at each moment of time, the first and second controllable control interfaces of said control circuit in such a way that the force components generated by said predetermined working chambers generate one of said sum forces corresponding to or closely related to said guideline value. - an actuator or actuator unit configured to generate sum forces (Fcyl) effective on a load and in two opposite directions; - at least two working chambers operating by the principle of displacement and located in said actuator or actuator unit, the at least two working chambers including at least two predetermined working chambers (19, 20, 21, 22); - at least one charging circuit (HPi, HPia) of a higher pressure, which is a source of hydraulic power capable of both producing and receiving a volume flow at a first predetermined pressure level; - at least one charging circuit (LPi, LPia) of a lower pressure, which is a source of hydraulic power capable of both producing and receiving a volume flow at a second predetermined pressure level; - a control circuit configured to couple at least one of said charging circuits of a higher pressure (HPi, HPia) and at least one of said charging circuits of a lower pressure (LPi, LPia) in turn to each predetermined working chamber (19, 20, 21, 22); - at least one controller for control of said sum forces generated by said actuator or actuator unit; - the control circuit comprises, for each predetermined working chamber (19, 20, 21, 22), a first controllable control interface (9, 11, 13, 15) configured to open and close a first connection to the charging circuit of a higher pressure (HPi, HPia), and a second separate controllable control interface (10, 12, 14, 16) configured to open and close a second connection to the charging circuit of a lower pressure (LPi, LPia); - wherein each predetermined working chamber (10, 20, 21, 22) is capable of generating force components (FA, FB, FC, FD) that correspond to the first predetermined pressure level and the second predetermined pressure level of the at least one charging circuit of a higher pressure and the at least one charging circuit of a lower pressure (HPi, HPia, LPi, LPia) to be coupled to each predetermined working chamber; - wherein each force component is configured to generate at least one of said sum forces in combination with the force components generated by the other predetermined working chambers; - wherein said at least one controller is configured to control said control circuit on the basis of an input that is a guideline value for a sum force to be generated, acceleration of the load, speed of the load, or position of the load; and - wherein said at least one controller is further configured to control, at each moment of time, the first and second controllable control interfaces of said control circuit in such a way that the force components generated by said predetermined working chambers generate one of said sum forces corresponding to or closely related to said guideline value.