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LEVER-CAM MECHANISM OF A HYDRAULIC VALVE

When cam 1 rotates about fixed axis A, lever 2, turning about fixed axis O, depresses the stem of valve member 3. Fluid delivered to chamber a is discharged through port 4. When the roller of lever 2 runs off the lobe of cam 1, valve member 3 is closed by the action of spring 5.
$3954$LHP,Va$