High Quality Content by WIKIPEDIA articles! A ballcock (also balltap or float valve) is a mechanism, or machine for filling water tanks, such as those found in flush toilets, while avoiding overflow. An early float valve was used in the 9th century by the Banu Musa brothers, a trio of Persian engineers, and described in their Book of Ingenious Devices. The modern ballcock was later invented by Thomas Crapper in the 19th century. It consists of a valve connected to a hollow sealed float by means of a lever, mounted near the top of the tank. The valve is connected to the incoming water supply, and is opened and closed by the lever which has the float mounted on the end. When the water level has risen to a preset fill line, the float forces the lever to close the valve and shut off the water flow. This is an example of negative feedback and of proportional control.

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