Hydraulic steering for articulated vehicle - has preliminary control valve on steering column to set main valve

摘要

A hydraulic steering system for an articulated vehicle has a first control valve between the servo steering valve and the pump, to isolate the servo valve for ahead travel and maintain max. pressure in the servo rams. This ensures that the vehicle is held rigid for good control. When the steering turns the first valve provides an increasing pressure for the servo valve. The system enables a heavy articulated vehicle to be steered without having large and complex valves on the steering column. It also isolates the steering when not required and saves fluid, to allow other hydraulic attachments to operate efficiently.