초록 ▼

A solenoid operated valve with a single inlet for connection to a pump and a control signal outlet for connection to a power assist steering actuator and a bleed port for connection to a pressure control valve. The valve has a poppet rod extending through an annular valve seat, with a pressure equal

A solenoid operated valve with a single inlet for connection to a pump and a control signal outlet for connection to a power assist steering actuator and a bleed port for connection to a pressure control valve. The valve has a poppet rod extending through an annular valve seat, with a pressure equalization passage extending through the poppet and rod to balance the inlet pressure forces acting on the poppet and rod. The valve provides a low residual flow when the solenoid is de-energized and proportionally increases flow as current in the solenoid is increased and gives substantial linearity.

대표청구항 ▼

1. A method of controlling hydraulic assist to a vehicle steering system comprising:(a) disposing an electrically actuated flow control valve having an inlet and first and second outlet for receiving pressurized fluid at said inlet from a source of pressurized fluid; (b) connecting an hydraulic stee

1. A method of controlling hydraulic assist to a vehicle steering system comprising:(a) disposing an electrically actuated flow control valve having an inlet and first and second outlet for receiving pressurized fluid at said inlet from a source of pressurized fluid; (b) connecting an hydraulic steering actuator to receive fluid from said first outlet of the valve; (c) connecting a pressure relief valve to the second outlet of the valve and connecting the pressure relief valve for returning fluid to the source; (d) disposing an annular valve seat in said valve between the inlet and said first outlet; (e) disposing an elongated valving member through said valve seat and forming an annular valving surface on said member and forming a pressure equalizing passage lengthwise through said member and equalizing the pressure on the ends of said member on opposite sides of said valve seat; (f) electronically energizing said valve and moving said valving member and increasing flow over said valve seat proportionally with increasing energization; and, (g) biasing said valving member valving surface toward said annular valve seat when said valve is de-energized.