Abstract: A replaceable flapper and keeper assembly for a fluid check valve. The assembly may be part of a larger replaceable seat ring assembly or be adapted to be secured directly on an integral check valve seat. The flappers have hinge brackets and are pivotally attached to a hinge pin that extends through holes in keepers. The flappers are adapted to be moveable in the direction of the valve axis (or normal to the plane of the flappers when in closed position) by having the holes in their hinge brackets elongated only in this direction. The flappers are able to move downstream of the seat before opening, minimizing wear and damage. Flapper, keeper and hinge pin are easily replaceable.

Abstract: A fluid check valve of the two flapper variety which has replaceable seat flapper assembly. The assembly comprises a tubular ring having a seating area on the surface of one end and a reduced diameter portion on the other end. A pair of pin keepers are attached to opposite sides of the seat ring and the flappers are pivotably attached to a pin that passes through elongate holes in the keepers. The seat ring is a sliding fit in the bore of the valve body and abuts against an annular rib in the valve body bore. The reduced diameter portion of the seat ring extends through the annular rib. A retaining ring is attached to the reduced diameter portion by threaded engagement, bolts, or other means and tightened until it abuts against the other side of the annular rib thus holding the seat ring in tight assembly in the valve bore against the rib.

Abstract: A fluid check valve has a flapper assembly mounted in the bore of a valve body. The assembly has two flappers mounted on a hinge pin which is mounted at each end in holding members which fit against the bore of the valve. The hinge pin is mounted in elongate slots in the holding members which allow movement of the pin and hence the flappers along the axis of the valve. The elongate slots prevent any lateral or sideways movement of the pin. The holding members fit between the valve seat and a retaining projection or projections in the valve bore. Locating means retain the flapper assembly in position with the holding members between the seat and the projections.