Automatic air vents
Self bleeding radiator valves automatically vent the air from your radiators negating the need for manual bleeding which is a messy and time consuming DIY job that most people could do without. By fitting these valves you can rest assured that the air will stay out of your radiators helping your system to run much more efficiently.
You will normally notice one of two things, that your radiator feels cold and the top and hot at the bottom which means that there is air trapped inside. The other thing you may notice is a banging noise which is particularly noticeable when you first turn your heating on in the morning or evening.
If you have air in your system then it needs to work much harder to achieve the temperature you require in your home. air also causes your pipes to corrode much more quickly in fact whichever way you look at it it will end up costing you more money. Why pay more for your heating when you don't need to?
In simple terms once fitted the valve will open to let any air escape. As water hits the valve it automatically shuts so that no water escapes to ensure there is no leakage, as air enters the radiator this is repeated again. After initial installation it can take a little while for the valve to vent all of the air so you need to be patient and resist the temptation to manually bleed. Once the air is removed you can leave well alone and need never manually bleed your radiator again.