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Flushing Action

The purpose of any WC cistern is to act like a bucket of water, that puts a large volume of water down the pan when the flush is operated. The majority of WCs are fed with their flush water by means of a direct action cistern. The water supplies the system via an inlet valve. You need to put enough water into the bowl quick so it activates the siphon. If you had to do it using a normal domestic water pipe, it would not be fast enough and the siphon would never operate. So the cistern holds several gallons of water, and it takes around 1 minute to fill. When you flush, all of the water in the tank is dumped into the pan in around 3 seconds, like pouring in the bucket of water. When flushed, it starts to fill via a filling valve. This inlet valve is opened and closed by the action of a hollow ball float connected to the end of a rigid arm. When the water begins to rise in the cistern, the float lifts until the other end of the arm shuts off the valve and stops the water feed. The flush operates a lever inside the cistern connected by a wire to a rod attached to a perforated plastic or metal plate at the bottom of an inverted U-bend tube (the siphon). Plumbers employ skilled tradesmen. As this plate begins to raise, the perforations become sealed by a fitted flexible plastic diaphragm (flap valve). The plate can now displace a body of water over the U-bend to commence the siphoning process. The diaphragm lifts under the pressure of the water behind it and now the contents of the cistern flow up through the perforations in the plate, over the U-bend and down the flush pipe. As the water level in the cistern falls, so does the ball float, and opens the inlet valve which begins to fill the cistern. There can be some problems with the flushing mechanism like slow or noisy filling which can quite often be repaired by replacing the ball float inlet valve. When WC wont flush unless the lever is operated constantly, means that the flap valve potentially needs repalcing with a new one. If the lever for the flush feels really loose, try checking the wire link on the end of the flushing arm is still in tact. A Plumber can supply and fit a new cistern. If water runs constantly into the WC pan, check the condition of the siphon washer on its base.