Valves (Float Operated)

Float valve (Diaphragm-Type).

The float valve has been around forever, and is usually constructed by amalgamating a ball of plastic or rubber on an extended arm, with this ball being lifted up and down by a water level. In operation it is much the same as the traditional brass valve, but when it comes to the business end of the arm, the working action is such that when the water rises, a plastic piston pushes against a rubber window or diaphragm, this acts on the rubber disc on the other side of the diaphragm and pushes against the water inlet nozzle to cut off the water. Shoreditch Plumbers know how these valves work and can repair them. When the water level drops, the float falls, with the effect that the other end of the arm will stop pressing against the diaphragm and the water flows through the nozzle.

Float valve (Portsmouth-Type).

Made of brass and virtually indestructible, the Portsmouth is popular. It operates by using a cylindrical plug moving back and forward inside a horizontal chamber. When its ball float is in the ‘up’ position, the other end of the float arm pushes the plug along its chamber, the result is that a rubber disc at the end of the plug is pressed hard against the water inlet nozzle stopping the flow of water. A Shoreditch Plumber fits this type of valve. When the ball float is in the ‘down’ position, the float arm pulls the plug back along the chamber, and as a result the same rubber disc located at the end of the plug moves away from the water inlet nozzle, allowing the flow of water into the cistern.

Note:
There is a third valve that is called a Croydon valve which operates along similar lines, the only real difference being that the plug moves vertically instead of horizontally. Modern diaphragm valves are in many ways a more efficient option.

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Valves (Float Operated)