Hydrostatic adjustment unit for stepless adjustment of flow rate of hydraulic conveyor device, has servo system directed over permanent hydraulic connections that are guided from pressure level between control edges to low pressure level

摘要

The unit (1) has a servo system (3) comprising a servo adjustment with control pistons (11, 11') actuating two actuators (12, 12'), servo pistons (5, 5'), servo cylinders (4, 4') and a position recovery system (9). The control piston is provided with a negative control edge cover at control edges (24, 24', 27, 27') in a neutral position. The servo system is directed over permanent hydraulic connections (30, 30') that are guided from a pressure level between the control edges to a low pressure level and runs out from servo regions (6, 6').