Patent ID: 6199221
Filing Date: 2001-03-13
Classification: E03D

Abstract:
In combination with a flush tank having a downwardly open outlet and means for filling the tank with a liquid, a flush valve comprising:a tube fitted to the outlet and having an upper end vertically displaceable in the tank and a lower end;a float fixed to the tube upper end and having a buoyancy changeable between a high buoyancy capable of holding the tube upper end above a liquid level in the tank and a low buoyancy insufficient to hold the tube upper end above the liquid level; andactuating means connected to the float for temporarily changing the float from high buoyancy to low buoyancy and thereby sinking the tube upper end below the liquid level and causing the liquid in the tank to flow through the tube out of the outlet, the lower end of the tube being vertically movable with respect to the is liquid level and extensible through the downwardly open outlet when the liquid is being drained from the tank.