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In every radiator, at the moment of the fixing, it is necessary to apply the vent valve, namely this component which allow to let out all the air from the heating circuit. This valve is similar to a little tap, and it’s actuated manually by those who have it in order to perform the purge move. Venting valve could be manual or automatic: the automatic vent valve facilitates the purges move and is operated by a bobber, in contrast to the manual one which requires the action by those who possess it. In the moment where there is air into the radiator, venting valve allows reducing the internal lever.