• August

    11

    2014
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  • 0

The Direct Action (Cistern)


The so called direct action WC cisterns are thought to be much more reliable than the older types of cistern. They can be used in a high level, or a low level and close coupled styles. These cisterns are usually made from either ceramic or plastic. Hackney Plumbers can work on all appliances. There is a down pipe that goes to the lavatory pan that is connected to an inverted U-bend in the cistern, with the other end of the U going to a reservoir at the bottom. Here, there is a perforated disc covered by a flexible material called a flap valve, with a vertical rod attached to a lever mechanism. The water supply enters the cistern via an inlet valve. This is opened and closed by the action of a hollow float attached to one end of a rigid arm. When the water rises in the cistern, it raises the float so that the other end of the arm closes the valve and isolates the supply. The toilet is flushed by pressing a lever, that is linked by wire to a rod connected to a perforated plastic or metal plate at the bottom of an inverted U-bend tube (siphon). As the plate is rising, the perforations in the plate are sealed by a flexible plastic diaphragm (flap valve), so the plate can move a body of water over the U-bend to create the siphoning action. A Hackney Plumber is a qualified professional. The water pressure behind the diaphragm lifts it, so that the contents of the cistern flow up through the perforations in the plate, over the U-bend and down at the flush pipe. When the water level in the cistern drops, so does the float, thus opening the float valve to refill the cistern. If the cistern will not flush until the lever is operated several times, the flap valve probably needs replacing. If the flushing lever feels loose, visually check that the wire link at the end of the flushing arm. If water runs continuously into the pan, visually inspect the condition of the washer at the bottom of the siphon.



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