| 摘要 |
A proportional solenoid-driven valve control assembly contains a moveable, magnetic armature (222) adjacent to a fixed pole piece (306), providing flui d leakage containment, and having no non-magnetic element for alignment, suppo rt or magnetic flux path control. A valve unit (200) coupled with the armature contains a fluid cavity in fluid communication with a fluid inlet port (204) and a fluid exit port (206). The valve is closed by a poppet (220) coupled with the armature (222). To compensate for fluid pressures exerted against t he poppet, a flow restriction is provided between an armature cavity (256) and the fluid cavity. Also, a bore (223) is formed through the armature to provi de fluid communication between the fluid exit port and the armature cavity. Thi s serves to balance fluid pressures at the fluid inlet and exit ports applied to the opposite sides of the fluid flow restriction.
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