The invention relates to a fluid system for the reliable operation of an actuator (2) controlled by fluid means, comprising a control device (3), a valve controller (4), fluid control valves (6, 7; 106, 107) that are designed to influence fluid flows on at least one actuator (2), sensors (19, 20) designed to determine a state of the actuator and a monitoring device (23) designed to process the sensor signals and to provide a monitoring signal to the valve controller (4). The control device (3) is designed in accordance with a first safety category of a safety standard and the valve controller (4), the fluid control valves (6, 7; 106, 107), the sensors (19, 20) and the monitoring device (23) are designed in accordance with a second safety category of the safety standard, wherein said second safety category is positioned at a higher level than the first safety category within the safety standard.