3 which are thereby heavily stressed in this situation non uniform line pressure is also obtained in order to prevent this a pressure ratio monitoring device 60 is built into the pressure control device in principle it would be possible in order to obtain the heretofore described function of controlling pressure in the floating roll 1 in dependence on the pressure in the loading device 10 to let the line 38 open directly into the adjusting valves 40 and 41 and the line 20 directly into the line 19 according to fig1 however these lines are brought through the pressure ratio monitoring device 60 and in addition the pressures in the longitudinal chambers 7 and 8 are tapped via lines 61 and 63 and fed to a pneumatic hydraulic control element 62 which is part of the pressure ratio monitoring device 60 the control pressure 50 in the line 20 is present at the input 64 of the control element 62 and the pressure in the lines 61 and 63 at the inputs 65 and 66 the control signal 51 present in the line 38 arrives at the input 67 and is passed at the output 68 into the line 39 the output 68 is furthermore connected to the input 69 in the control element 62 the control pressure 50 which represents.