Rückschlagventil mit austauschbarer Ventilsitz- und Klappeneinheit

摘要

A fluid check valve of the two flapper variety which has replaceable seat flapper assembly. The assembly (18) comprises a tubular ring (22) having a seating area (42) on the surface of one end and a reduced diameter portion on the other end. A pair of pin keepers (24) are attached to opposite sides of the seat ring (22) and the flappers (26) are pivotably attached to a pin (30) that passes through holes (32) in the keepers (24). Preferably the pivot holes (32) in the keepers (24) or the pivot holes (34) in the flappers (26) or both are elongated to allow movement of the flappers (26) along the valve axis. The seat ring (22) is a sliding fit in the bore (20) of the valve body (10) and abuts against an annular rib (16) in the valve body bore (20). The reduced diameter portion of the seat ring (22) extends through the annular rib (16). A retaining ring (62) 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 (16) thus holding the seat ring (22) in tight assembly in the valve bore (20) against the rib (16).