When cam 1 turns counterclockwise about fixed axis A, valve lifter 2 is raised, compressing spring 3 and lifting valve 4 off its seat. At this, ball valve 5 is closed by the fluid. The fluid seeps through the clearance between plunger 6 and cylinder 7. Upon further rotation of cam 1, valve 4 drops back on its seat. Regulating chamber B is filled with fluid through raised ball valve 5. Fluid is admitted inside the valve lifter through port a.
$3769$SHP,FD$