Patent ID: 7870729

Claim:
A hydraulic control device for a primary, first hydraulic consumer ( 14 ) and a secondary, second hydraulic consumer ( 15 ) with a first metering orifice ( 17 ), via which the pressure medium is suppliable to the first hydraulic consumer ( 14 ), with a pressure scale ( 45 ) installed upstream of the first metering orifice ( 17 ), via which a constant pressure difference is adjustable using the first metering orifice ( 17 ) and which includes, for this purpose, a valve piston ( 48 ) with a first control edge ( 77 ), with which a first flow area between a supply line ( 13 ) and the first metering orifice ( 17 ) is controllable, with a second metering orifice ( 31 ), via which the pressure medium may be supplied to the second hydraulic consumer ( 15 ), and downstream of which a second pressure scale ( 30 ) located, which, in the closing direction, may be acted upon by a control pressure present in a control space ( 34 ) and which, in the opening direction, may be acted upon by pressure after the second metering orifice ( 31 ), with a pressure medium source ( 10 ) that delivers variable quantities, the pressure medium source ( 10 ) being controllable as a function of the highest load pressure of the actuated hydraulic consumer ( 14 , 15 ) in a manner such that the pressure in the supply line ( 13 ) is higher than the highest load pressure by a certain pressure difference, and with a load-signalling line ( 38 ) that may be acted upon with the load pressure of the second hydraulic consumer ( 15 ) or a pressure derived therefrom, and which is connected with the control space ( 34 ) of the second pressure scale ( 30 ) and with a control device ( 11 ) of the pressure medium source ( 10 ), wherein a second control edge ( 79 ) is provided on the valve piston ( 48 ) of the first pressure scale ( 45 ), with which a second flow area located between the supply line ( 13 ) and the load-signalling line ( 38 ) is controllable.