method includes operatively connecting a tank neck to at least two pressure accumulator vessels having different admissible operating pressures in which at least one of the pressure accumulator vessels has an admissible operating pressure lower than a maximum applicable pressure at the tank neck simultaneously filling via the tank neck the at least two pressure accumulator vessels with a fluid medium and preventing an inadmissible pressure rise in the pressure accumulator vessels with the lower admissible operating pressure during the simultaneous filling application_number US 201314072730 A description fig1 illustrates by way of example a circuit diagram for different pressure levels in main and secondary accumulators the system includes a main accumulator s 1 with a relatively high admissible operating pressure and with an automatic cylinder valve acv 1 and two secondary accumulators s 2 with equal admissible operating pressure and with automatic cylinder valves acv 2 and acv 3 the admissible operating pressure of which secondary accumulators lies below the admissible operating pressure of the main accumulator the initial situation upon refueling of the system is such that the pressure shut off valve 210 in the pressure shut off valve unit psv with a spring force 211 set in a desired manner is open in a throughflow direction and thus the medium can flow to the downstream pressure accumulator system on the pressure accumulator vessels acvs are used which to the pressure accumulator vessel have an internal bypass which permits refueling but which in a deenergized state does not permit a withdrawal from the pressure accumulator vessel when a defined pressure is reached in the control line 243 the shut off valve closes the inflow path from the pressure.