| 摘要 |
Flush valve assemblies are provided that include a valve body which may have a radiused inlet portion, an upper inlet end having an inlet opening, a lower outlet end having an outlet opening, and a wall extending between the upper inlet end and the lower outlet end and having an interior surface defining a flow path that extends generally longitudinally through the valve body from the inlet opening to the outlet opening and that has a generally circular transverse cross-section. A height measured longitudinally through the valve body is greater than a largest diameter of the transverse cross-section of the flow path so as to enable the valve bodies herein to have an elevated wall and head from a toilet tank floor. The assemblies may include a flapper valve cover detachably connected to the flush valve assembly and having a transverse cross-sectional diameter sufficiently large to cover the inlet opening of the valve body, a pivot mechanism and a flapper bulb. The flapper valve cover is sufficiently buoyant so as to be capable of resisting the force of flowing water and remain open so as to allow flush water to pass through the valve body when the valve body is installed on a toilet having a flush volume of about 1.6 gallons per flush or less before closing the valve cover so as to be useful in high performance, and also in high-efficiency toilets.
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