HYDRAULIC INSTALLATION

1. Hydraulic installation with a steering circuit (L) and at least one operating circuit (A) and with at least two pumps supplying these circuits, to each of which pumps a pressure balance (21 and 27, respectively) is assigned, of which the pressure balance (27) is assigned to the operating circuit (A) is in the delivery line (28) of the pump (11) supplying this operating circuit, there leading from this pressure balance a line connection (34) to the steering circuit (L), in which connection a non-return valve (37), opening from the operating circuit towards the steering circuit, is arranged, and both pressure balances being impinged on the one hand by the delivery pressure of the pump (10) assigned to the steering circuit, on the other hand being loaded by the control pressure prevailing at the valve (14) assigned to the steering circuit and also, from this side in each case, by a control spring (22, 39), of which the control spring (22) of the pressure balance (21) assigned to the steering circuit has a higher biasing force than the other control spring (39), characterized in that the pressure balance (21) assigned to the steering circuit (L) is connected in parallel to the delivery line (13) of this pump (10) and in that in this delivery line (13) there is arranged a non-return valve (36), which opens in the direction of the steering valve (14) and lies on the one hand between the connection point (19) of a branch line from the delivery line (13) of the first pump to the pressure balance (21) and on the other hand in front of the junction of the line connection (34) from this delivery line to the delivery line of the second pump (11).