Hydraulic control arrangement for the demand-feed regulated (load-sensing-regulated) hydraulic fluid supply to preferably several hydraulic consumers

A hydraulic control arrangement for demand-feed-regulated supply of pressure medium to at least one hydraulic consumer comprising

• proportionally adjustable directional valves (12) for controlling the at least one hydraulic consumer, with a first hydraulic pump (30) and a second hydraulic pump (31) which are capable of being driven jointly and by which pressure medium is conveyable in a quantity corresponding to demand into a common inflow line (26) leading to the directional valve (12),
• a first demand-feed regulator (45) which is coordinated to the first hydraulic pump (30) and a second demand-feed regulator (46) which is coordinated to the second hydraulic pump (31), said two demand-feed regulator (45, 46) being capable of being acted upon, with effect of increasing pressure medium quantity discharged into the inflow line (26) by the corresponding hydraulic pump (30, 31), by a spring (48, 49) and, on a first active surface, by pressure in a load-signaling line (85) and, with effect of reducing the pressure medium quantity discharged into the inflow line (26) by the corresponding hydraulic pump (30, 31), on a second active surface, by a pump pressure, and
• a nonreturn valve (36) arranged between the first hydraulic pump (30) and the inflow line (26) and opening toward the latter,
• a nonreturn valve (37) opening toward the inflow line (26) is also arranged between the second hydraulic pump (31) and said inflow line, and
• means (90, 91, 95, 96) by which action of force upon the demand-feed regulators (45, 46) are changable such that the at least one hydraulic consumer is suppliable with pressure medium both solely by the first hydraulic pump (30) and solely by the second hydraulic pump (31).