Pressured toilet tank flush valve

Abstract

A flush valve device is described for use in a toilet that includes a pressured water source, which can drain away water in the event of excess pressure with minimal modification to the toilet and which facilitates initial operation of the flush valve device. The flush valve device includes a valve member (16, FIG. 2 ) which lifts off a valve seat (22) at the beginning of a flushing, the valve member carrying a pressure operated relief valve (50) which dumps water at excess pressure through the opening (52) within the valve seat, to avoid the need for additional fluid-tight couplings in the water source. The valve member includes a sealing portion (60) which normally lies against the valve seat and which is lifted completely away from the valve seat during a flushing. A manually operated flushing mechanism which lifts the valve member off the valve seat, is coupled to the outer end (80) of the sealing portion, with the outer end of the sealing portion being flexible enough that it progressively peels away from the valve seat at the beginning a flushing. The peeling away allows the escape of some water through the valve seat to facilitate the liftoff of the rest of the sealing portion from the valve seat.

Dependencies are inferred from the claim text.