English: An example of a moving pin equilibrium float valve. When the float (1) is raised to normal water level, the float arm (2) is rotated about the pivot (3) and pushes the shaped pin (4) through the diaphragm (5) into the body of the valve. The shape of the pin and diaphragm allow water to pass from the inlet (7) through the pilot hole (6) to the secondary chamber (b), balancing the pressure and forcing the diaphragm against the inlet.
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