Pressure control for system with primary and secondary consumers

摘要

A hydraulic system for utility vehicles supplies primary 7 and secondary 12,13 consumers with different system pressures, exceeding load pressure by a pressure differential. To produce a first primary consumer differential, its load pressure 24 is used directly 23, 17 at sequence 16 and regulator 15 valves. To produce a second, higher auxiliary consumer differential, its load pressure 31, 32, 33 is converted to an increased pressure 40, 41 in amplifier 34 comprising a pressure reducing valve 35 permanently adjusted to a reduced pressure and having pressure 38 and second 39 inlets, an outlet 40 and control piston 42 whereby system pressure line 5 is connected to the pressure inlet, auxiliary load line 33a is connected to the second inlet and an amplified load reporting line 41 connected to the outlet 40. The control piston balances spring force 43 second inlet and outlet pressures.