WC Water Flush

When you next lean over to pull the lever or handle or push the short or long flush button on the loo, take a second to admire the sheer marvel of the toilet, and the tranformation of the human race it made. The himble cistern that is part of the WC is quite a clever and very useful piece of technology, and can be fitted with new and very efficient flushing devices. A Grove Park Plumber can supply and fit toilet cisterns. The brief history of the cistern begins really with the Romans, however we are only interested in the newer models. Before 1993 the cistern held 9ltrs or 2 gallons of flushing water. Then the volume was lowered for water saving, initially to 7.5ltrs, with 6ltrs now being the standard. The cistern water in older systems was maintained and controlled with an old valve operated by a float. This sat on top of the water and dropped as the level dropped on flushing. Once at its pre-set lowest point it would open a filling valve or inlet and the water would rise again, filling the cistern and lifting the float once more. A Lee Plumber is a professional tradesman. The old systems would use a “Siphonic” device, but now this happens via a valve lifting letting the water flow. There is a device employed to shut off when the most effective volume of water has been discharged. When the toilet is flushed, an action called ‘Siphonic Action’ occurs, as water vacates any container having no mechanical help. The water moves up and over a tube shaped like an upside down ‘J’. It’s longer leg attaches to the flush pipe and it’s shorter leg is open to the water contained in the cistern. When the air is evacuated there is a partial vacuum and is started by a large diaphragm washer lifting and letting a quantity of water to discharge away through the flush pipe with the air causing the partial vacuum.



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