A hydraulic system, comprising: - a linear actuator configured to generate several discrete sum forces of different magnitudes; - at least four chambers (19, 20, 21, 22) provided in the linear actuator, the chambers including a first chamber and being configured to generate several discrete force components (FA, FB, FC, FD) whose combinations generate the sum forces; - at least two charging circuits (3, 4) configured to maintain stable predetermined pressure levels of hydraulic fluid including a first pressure level of a first charging circuit and a second pressure level of a second charging circuit, the charging circuits (3, 4) being configured to supply hydraulic fluid to the linear actuator and to receive hydraulic fluid from the linear actuator; - several independent control interfaces configured to open and close connections of the first and second charging circuits to the chambers, the control interfaces including at least - a first control interface configured to open and close the connection of the first charging circuit to the first chamber; and - a second control interface configured to open and close the connection of the second charging circuit to the first chamber; - an electronic control unit configured to control at least two of the control interfaces, including the first and second control interfaces; - wherein at least two of the control interfaces, including the first and second control interfaces, are proportional valves; characterized in that - the proportional valves are used as shut-off valves and are independently shiftable in a controlled manner to the open and closed positions, - wherein the control unit, the linear actuator, and the proportional valves are configured to implement non-throttled control and secondary control by coupling the first and second pressure levels to the first chamber by means of the proportional valves and by utilizing the first and second charging circuits for producing discrete force components corresponding the first and second pressure levels. - a linear actuator configured to generate several discrete sum forces of different magnitudes; - at least four chambers (19, 20, 21, 22) provided in the linear actuator, the chambers including a first chamber and being configured to generate several discrete force components (FA, FB, FC, FD) whose combinations generate the sum forces; - at least two charging circuits (3, 4) configured to maintain stable predetermined pressure levels of hydraulic fluid including a first pressure level of a first charging circuit and a second pressure level of a second charging circuit, the charging circuits (3, 4) being configured to supply hydraulic fluid to the linear actuator and to receive hydraulic fluid from the linear actuator; - several independent control interfaces configured to open and close connections of the first and second charging circuits to the chambers, the control interfaces including at least - a first control interface configured to open and close the connection of the first charging circuit to the first chamber; and - a second control interface configured to open and close the connection of the second charging circuit to the first chamber; - a first control interface configured to open and close the connection of the first charging circuit to the first chamber; and - a second control interface configured to open and close the connection of the second charging circuit to the first chamber; - an electronic control unit configured to control at least two of the control interfaces, including the first and second control interfaces; - wherein at least two of the control interfaces, including the first and second control interfaces, are proportional valves; characterized in that - the proportional valves are used as shut-off valves and are independently shiftable in a controlled manner to the open and closed positions, - wherein the control unit, the linear actuator, and the proportional valves are configured to implement non-throttled control and secondary control by coupling the first and second pressure levels to the first chamber by means of the proportional valves and by utilizing the first and second charging circuits for producing discrete force components corresponding the first and second pressure levels.