Patent ID: 8464755

Claim:
A hydraulic control system for controlling a variable fluid volume flow to a consumer ( 6 , 60 , 94 , 126 , 146 , 162 ) with a hydraulic pilot-controlled control valve connected to a fluid supply, the hydraulic control system comprising: an independent first control valve ( 2 , 56 , 90 , 122 , 142 ) being designed such that the first control valve ( 2 , 56 , 90 , 122 , 142 ) delivers a specified initial volume flow (Q 1 ), in an absence of a variable pilot control pressure (pVST), the first control valve ( 2 , 56 , 90 , 122 , 142 ) delivers a continuously increasing volume flow (O K ) as the variable pilot control pressure (pVST) increases, and at least one independent second control valve ( 170 ) which is a hydraulic pilot-controlled control valve ( 170 ), and the second control valve ( 170 ) being activated in a specified range ( 55 , 88 , 120 , 132 , 140 , 152 ) of the variable pilot control pressure (pVST), and the first control valve is connected to a fluid reservoir tank and delivers a bypass volume flow to the fluid reservoir tank in the absence of the pilot control pressure, the first control valve reduces the bypass volume flow as the pilot control pressure increases.