LOAD RESPONSIVE FLOW AMPLIFIED CONTROL SYSTEM

摘要

Pilot operated steering system with load-responsive flow amplified control system includes a directional control valve (19) movable to an operating position to direct fluid from an operating fluid circuit (16) through a variable orifice (75) to a steering motor (11) and to direct control fluid from a control circuit (17) through another variable orifice (74) to combine with steering motor fluid. Control fluid moves directional control valve (19) to an operating position. Pressure compensation creates a predetermined pressure differential across variable orifice (74). The steering control valve (24) controls the position of the directional control valve (19). Pump displacement (14) responds to pressure in control circuit (17) to establish a constant pressure differential between pump (14) and steering motor (11) load pressure. Relative size of the variable orifices determines the flow amplification ratio between the pilot control circuit and the power operating circuit.