Toilet flush valve with reducing cross section valve seat

摘要

A canister flush valve is disclosed with a valve seat modified to accommodate a greater initial surge of flow, without distorting flushing performance. There is a mounting at the bottom of a toilet tank that links to an outlet hole from the tank and forms a valve seat. A passageway through the mounting tapers in an arcuate manner below the valve seat. There is also a guide support structure in the passageway, preferably centered. The guide support structure also has a tapered leg.

主权项

1. A flush valve for controlling a flow of water out through a hole in a wall of a toilet tank, the flush valve comprising:
a mounting having a lower end suitable for facilitating installation of the mounting adjacent the hole, an upper end in a form of a valve seat, a through passage extending down from the valve seat, and a guide portion mounted in the through passage and extending upward therefrom, and a valve body positionable over the valve seat so as to be suitable to inhibit water flow through the mounting when in a first position where the valve body is positioned on the valve seat, and so as to be suitable to permit water flow through the mounting when the valve body is in a second position where the valve body is not positioned on the valve seat, the valve body being open at a top end and having a bottom wall that defines a pocket configured to receive water through the open top end; wherein the valve seat is positioned above the through passage, and the through passage arcuately narrows below the valve seat; and wherein the mounting includes a leg structure having upper and lower portions that are arcuately tapered along an inner surface of the through passage; and wherein the upper portion extends a first radial distance from the inner surface and the lower portion extends a second radial distance from the inner surface that is less than the first.