Cistern Water Control Valves

A method used to control the flow of water into water cisterns and tanks is to use ball, or float valves. A float on the water in a cistern is attached to an arm which operates a valve, controlling the water supply. Here are two examples: The Diaphragm Float Valve is a ball or float valve and made of plastic and rubber. In action it is much the same as the traditional brass valve, with the float being lifted up and down by the level of the water. 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 the rubber window or diaphragm, with the effect that the rubber disc on the other side of the diaphragm pushes against the water inlet nozzle to cut off the water. Walthamstow Plumbers work with all types of plumbing appliances. Of course, when the water level drops, the float falls, with the effect that the other end of the arm ceases to press against the diaphragm and the water flows out of the nozzle.
The Portsmouth Float Valve
is probably the most common type of ball or float valve in the UK. It is also known in the trade as the Portsmouth piston. These valves are usually manufactured from brass and are considered to be pretty much indestructible. The valve opens and closes by the use of a cylindrical plug moving backwards and forwards inside a horizontal chamber. As the ball float is in the fully raised position, the opposite end of the float arm moves the plug along the chamber, resulting in a rubber disc at the end of the plug being pressed up against the water inlet nozzle, isolating the water supply. A Walthamstow Plumber is a fully qualified professional. When the ball float is in the ‘down’ position, the float arm pulls the plug back along its chamber, with the result that the rubber disc located at the end of the plug eases away from the water inlet nozzle, allowing water into the cistern. A Croydon valve operates along much the same lines, the difference that the plug moves vertically instead of horizontally. The servicing of both types of valves involves cleaning the piston and/or replacing the rubber disc. While the Portsmouth valve and the much older Croydon are both available, modern diaphragm valves are in many ways a more efficient option.