Vehicle hydraulic steering system servo valve arrangement

摘要

The servo valve arrangement has a high pressure (P), low pressure (T) and motor connection (P1/2). A NC pressure control valve (4,10) is arranged between the high pressure and motor connections. A NO return control valve is arranged between the motor and low pressure connections, The pressure control valve has a lift closure member. A common actuator closes the return valve and opens the pressure valve against a spring bias. The two valves are interconnected or axially movable wrt each other by means of piston driven by the actuator.