| 摘要 |
A flush valve adapted to be mounted to the bottom of a tank. The flush valve has a body with a drain conduit and an opening which can be opened and closed by a movable plug. The body has an internal thread in the drain conduit. A mounting seal has a flange that bears against the tank bottom and a skirt that fits in the drain port in the tank. An expander has an external thread which engages the internal thread, and also has a tapered expander section that enters and diametrally enlarges the skirt when the threads are progressively engaged. Enlargement of the skirt makes a fluid-tight seal and exerts a force which holds the body of the tank. Torque-tool engagement surfaces are formed in the expander so it can be turned.
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