Patent ID: 7584939

Claim:
A surge flushing device for wastewater systems, comprising: a wastewater channel having an arc-shaped wall portion; a flushing blade element having an arc-shaped marginal portion thereof configured geometrically similar to said wall portion of said channel; a blade support linkage pivotally connected with said blade element and rotatably suspending said blade element generally above said wall portion of said channel, and configured to pivotally shift said blade element in a direction generally perpendicular to the direction of flow in said channel between a fully lowered, closed position, and a fully raised, open position, such that in said fully lowered, closed position, said marginal portion of said blade element is disposed a spaced apart distance from said wall portion of said channel; a gasket having a base portion thereof supported along said marginal portion of said blade element, and a flap-shaped, elastically deformable lip portion thereof protruding generally radially outwardly from said base portion and said marginal portion of said blade element when in said fully lowered, closed position; said lip portion having a thickness that tapers outwardly to a free terminal tip area which directly abuts and engages said wall portion of said channel when said blade element is in said fully lowered, closed position, thereby elastically flexing said terminal tip area into a curved shape which opens outwardly in a direction opposite to the direction of flow in said channel and resiliently urging said terminal tip area radially outwardly against said wastewater channel with a predetermined force to selectively form a secure seal therebetween; and an adjustable holder mounted on said marginal portion of said flushing blade element, and detachably retaining said base portion of said gasket therein to permit radial adjustment of said gasket relative to said flushing blade to insure secure sealing contact between said lip portion of said gasket and said wall portion of said channel.