| 摘要 |
A flapper valve for sealing the discharge outlet in a water tank and for regulating the quantity of water discharged during each flush by reducing the buoyancy of the flapper valve through water inflow into the flapper during flushing. The pivotally mounted flapper has an upper body section including an integral soft annular sealing flange and a downwardly depending body member. A cap is insertable at the lower ends of the side wall and defines a water inflow aperture therein. The cap is of a relatively rigid material and serves to support the buoyancy chamber formed by the upper body portion and the end cap against deformation under operating conditions. The cap may be provided with a valve disk for selective registry with one of multiple apertures to regulate the water inflow into the cone as a function of the dimension of the aperture selected in registry with the opening.
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