Hydraulic control circuit for load e.g. hydraulic operated casting cylinder, has first control units whose non return valve is configured so that inflow of fluid of second control units from load to first control units is prevented

摘要

The hydraulic control circuit (1) comprises parallel hydraulic control units (12,18,20,32) for actuating the hydraulic control circuit unit. The control units (12,18) are provided with a non return valve that is configured so that an inflow of fluid of the control units (20,32) from the load (2) to the control units (12,18) is prevented. A closing element of the non return valve is controlled and hydraulically adjusted by an actuation unit.