Toilet Flush Valve With Reducing Cross Section Valve Seat

Abstract

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.

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, a valve seat, and a through passage extending down from the valve seat; 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, and so as to be suitable to permit water flow through the mounting when the valve body is in a second position;   wherein the through passage arcuately narrows below the valve seat.