Patent ID: 7475502
Filing Date: 2009-01-13
Classification: F15B

Abstract:
1. A hydraulic control system for a construction vehicle, particularly for the control of hydraulic loads of an excavator, having at least one main control block forming several sections with spool valves located therein, a hydraulic fluid tank and a first pair of pump ducts to which pressure may be applied by means of a first pump and a second pump for the supply of hydraulic fluid to the hydraulic loads in series through the spool valves, wherein a second pair of additional pump ducts are provided, which do not pass through the spool valves, parallel to the first pair of pump ducts, and which are designed to ensure an additional parallel supply to the hydraulic loads by means of the spool valves such that the first pump can feed one of the first pair of ducts in series and ones of the additional pairs of ducts in parallel and the second pump can feed the other one of the first pair of ducts in series and other one of the additional pairs of ducts in parallel.