IMPROVED FLEXIBLE WEDGE GATE VALVE

摘要

A wedge gate valve (10) having a valve body (12) defining a valve chamber (20) and flow passages (18, 19) and upwardly diverging circular seat surfaces (28) of circular, flat configuration and defining seat planes. A valve disk or wedge (32) having downwardly converging sealing surfaces (34) is movable within said valve chamber between open and closed positions for controlling flow through the valve. Pressure boundary plates (60) connected by hubs (63) to the valve disk define the sealing surfaces of the disk and have bottom corners that establish line contact with the downstream seat surface and prevent any portion of said sealing surfaces of said valve disk from crossing the sealing plane of the downstream seat in the event of flow responsive downstream movement of the valve disk during its opening and closing movement.