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DISK-TYPE CHECK VALVE MECHANISM

When the pressure in cavity b drops below that in cavity a by an amount equal to that for which the valve is designed, valve disk 1 is lifted, overcoming the resistance of spring 2 and allowing fluid to flow from cavity a into cavity b. As the difference in pressure is reduced, spring 2 returns disk 1 against its seat, cutting off the flow of fluid into cavity b.
$3591$SHP,Va$