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Water closet flush valve

Image Number 2 for United States Patent #4312083.

A flush valve for a toilet having a tank and a bowl including a valve housing connected to a source of water, a valve stem operatively connected to a float and a piston operatively connected through a cam to a flush lever, the valve stem and piston movable independently to provide a valve for the admission of water to the tank and bowl together with a syphon having a tube therein for breaking the syphon action at a predetermined level of water in the tank, a float operatively connected to the valve stem which automatically varies the float level action and an arm connected to the cam for actuation by the float to return the flush lever to an inoperative position and another valve operated by the piston to interrupt the flow of water into the valve housing to prevent back syphonage of tank water into the water supply line.

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