Swing Check Valve Disc and Hinge

The disc and hinge form the moving closure of a swing check valve. Forward flow pushes the disc or clapper away from its seat. The hinge pin constrains that movement to a pivoting path, and the disc facing provides the sealing contact in the illustrated soft-faced version. These parts must work together: the pin locates the disc, while the facing meets the seat when it returns.

This is the swing mechanism, not the axial spring-poppet arrangement. A catalog can describe both valve families without implying that both closures belong in one valve. Their motion and closing behavior differ.

A useful selection question is how the closure responds when flow decelerates, not only whether it blocks steady reverse flow. Val-Matic's check-valve design guide explains that sudden interruption of reverse flow creates check-valve slam. Disc travel, inertia, installation orientation, and the surrounding pumping system influence that behavior. A soft facing should not be mistaken for a guarantee against pressure surge.

The three-part list is a generic explanation of the hinged closure. It does not specify a pressure class, allowable fluid, leakage class, or suitable mounting orientation. Those require the selected valve's documentation. BOMwiki's links from this valve into water-handling products describe catalog relationships, not an endorsement of one generic closure for every pumping duty.