Abstract: A swing-type check valve designed for allowing the flow of fluids in one direction only is constructed with a swinging hanger assembly comprising two hanger members, each member held pivotally captive on a hanger pin secured to the valve casing, whereby each hanger member is rotatable on the hanger pin. A portion of each hanger member defines a convex recess such that the pair of hanger members can interfit with and embrace the valve disc neck of a unitary valve clapper. The unitary valve clapper comprises a valve disc, a protruding cylindrical valve disc neck and a buttonhead of larger diameter than the valve disc neck. The hanger members closely embrace the valve disc neck and hold the valve clapper firmly in position. This hanger design allows the valve clapper to be constructed in one piece, eliminating problems of valve failure due to dimensional variations resulting from inability to define tolerances in composite valve clapper assemblies.