Flush valve

Abstract

A flush tank has a downwardly open outlet, a valve for filling the tank with a liquid, and a flush valve having a tube fitted to the outlet and having an upper end vertically displaceable in the tank between an upper position and a lower position. A float fixed to the tube upper end and having an upwardly open compartment has a low buoyancy insufficient to hold the tube upper end above the liquid level when the compartment at least partially filled with water and a high buoyancy capable of holding the tube upper end above a liquid level in the tank when the compartment is empty. A vertically displaceable actuating rod extending along an upright axis has an externally accessible upper end and a formation engageable vertically downward against the float to submerge same and fill the compartment so that when the compartment is filled the float is changed from high buoyancy to low buoyancy and the tube upper end sinks from the upper position below the liquid level and causes the liquid in the tank to flow through the tube out of the outlet. Stop formations on the tube and on the rod are engageable for limiting downward displacement of the float and tube to an intermediate position above the lower position and are disengageable to allow downward displacement of the float and tube into the lower position.

Dependencies are inferred from the claim text.