Abstract:
A flapper discharge valve comprises a movable flapper which is adapted to be movably seated on the opening in the outlet pipe by way of which the toilet tank empties. The flapper is adapted to be pivoted into or out of operative relation with this opening, whereby it either covers the opening to prevent water from escaping therethrough or it uncovers the opening to permit water to escape therethrough. The flapper carries a projecting member on its top surface which provides a streamlining action which assists the flapper in pivoting in the water and freeing the outlet opening so that water can escape, and it also includes various other projecting portions, including one on its bottom surface, which assist the flapper in performing its opening and closing operations. The projecting members on the top and bottom surfaces serve, among other things, to impart buoyancy to the flapper valve, and the provision of the projecting member on the top surface makes it possible to minimize the size of the projecting member on the bottom surface, thus eliminating or substantially lessening the likelihood of said member catching or snagging on the lip of the outlet opening and so failing to cover this opening.