Most WC systems usually worked by using something called a “Siphonic valve” fitting, but now there is another design in which a valve will lift and let the water flow. Discharging this from the cistern down into the pan, a device is employed that shuts when the most efficient volume of water has been discharged. Before 1993 all the cisterns that were fitted on the WC held 9lts (2 gallons) of water to flush. In an effort to try and save water, the volume was reduced at first to 7.5lts and then settled on the amount in use today and that is 6lts. Brockley Plumbers fit any design of WC suite.

WC cisterns today are different than they were years ago. The WC cistern is now, a modern piece of technology. The water supplied to the cistern was controlled by a float operated valve, so as it sat on the water level lowered when the flush operated and opened the fill valve at the bottom allowing the cistern to fill. Once the float was at the high the filling valve would close off.

Flushing With Buttons:
Two buttons are now fitted to a cistern, the first uses a short flush (low volume of water) and the second a long flush (larger volume of water). They use a 2-rod system which releases the small and larger volumes of water as needed. A Brockley Plumber can install, service or repair these buttons.

Siphonic Affect:
As the flush water leaves a tank or cylinder with no it is said to have siphonic action. It moves up and over a tube that is in the shaped like an upside down ‘J’. The longer leg joins to the flush pipe whilst the shorter leg is open to the water in the cistern. When the air inside is removed, there is a partial vacuum created. This is initiated by a large diaphragm washer lifting and causing a quantity of water to discharge away through the flush pipe taking air and causing a partial vacuum.