| 摘要 |
An electro-hydraulic pressure regulating valve including a control pressure chamber, an annular supply pressure port connected to the control pressure chamber and having a first seat area, an annular exhaust port connected to the control pressure chamber and having a second seat area equal to the first seat area, an armature valve plate spring biased to a supply seated position closing the supply pressure port with the exhaust port open, and an electric solenoid operative when selectively energized to create a solenoid EMF for moving the armature plate to an exhaust seated position closing the exhaust port with the supply pressure port open. The armature plate has a circular cut-out therein aligned with the centers of the annular supply pressure and exhaust ports and the differential pressure area of the armature plate in the supply seated and the exhausted seated positions is equal to substantially only the first and second seat areas.
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