Patent ID: 7323037

Claim:
A filtration device with improved purge assembly, of the type including a filtration unit, the device comprising: a sealed casing internally defining a filtration chamber provided with filtration means and, in its lower part, a bowl for collection of a residual liquid from the filtration means, and an assembly for purging the residual liquid which comprises means for evacuation of the liquid collected in the bowl and means for connection of the casing to the open air, wherein the means for evacuation of the liquid comprise an orifice formed in the wall of the casing substantially at the level of the bottom of the bowl for collection of the liquid, wherein the means for connection to the open air comprises an orifice formed in the wall of the casing substantially opposite the orifice for evacuation of the liquid, and wherein the means for connection to the open air and the means for evacuation of the liquid comprise: a single obturator displaceable between a sealing position in which, on the one hand, its upper part forms a tight plug for the orifice for connection to the open air and, on the other hand, its lower part forms a tight plug for the orifice for evacuation of the liquid, and a gravity purge position, in which, on the one hand, its upper part is disengaged from the orifice for connection to the open air and, on the other hand, its lower part is disengaged from the orifice for evacuation of the liquid allowing the liquid to be evacuated under the influence of gravity.