The heating expansion vessel
On the side of the gas vessel is inflated to a certain pressure , such as a car tire, and when the water expands , the gas is compressed is elastic thereby ensuring constant water pressure .
When the expansion vessel is deflated , it no longer performs its function and it is necessary to inflate . A expansion vessel can deflate due to a leak in the valve ( rare ) or the porosity of the membrane (much more common). This is mainly due to the quality of the rubber.
Few now the boiler manufacturers that incorporate a expansion vessel of quality in their devices . Moreover , few installers that take into account the volume of water in the system ( in fact an integrated 5l vase is not suitable for an old installation with several cast iron radiators with high water capacity).
The expansion tank serves as the name suggests to compensate the expansion of the water. When the water is heated, it expands and therefore increases in volume. In a closed heating circuit, the result of this expansion is a pressure increase. And this is where comes into play our famous expansion vessel, it is he who maintains a stable pressure, hot or cold.
It consists of a capacitor, usually separated by a rubber membrane, one side of it there is the water heating circuit and the other a gas non-flammable ( air , nitrogen , inert gas , etc. . )
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