Hydraulic control

摘要

The hydraulic control system (S) has a multi-stage constant delivery pump (P) and includes safety valves (13,15) set to different load pressure limits. All the pump stages (P1,P2) are connected to a single circuit pressure supply system (3-5) common to all users (V1,V2). Up to the load dependent achieving of a lower load pressure limit, a combined feed volume from the feed volume (Q2) of the pump stage (P2) with the highest load pressure limit and at least the feed volume (Q1) of the pump stage (P1) with next lower load pressure limit is used for each user.