Device for the slow-moving door of gravity filtering facilities (Machine-translation by Google Translate, not legally binding)

摘要

Device for the slow start of gravity filtration installations, characterized by comprising a casing, which is filled with liquid up to a certain level when the filter is to be washed with a drainage opening in its bottom, and in which a float is mechanically coupled to the filtered liquid outlet valve, the assembly being arranged so that, upon finishing the washing of the filter, the supply of liquid to the box ceases, the partial emptying of the filter then taking place. In a time determined by the drainage, remaining in a first stage the submerged float and the inactive filter, and in a second stage the float enters in flotation, activating the filtered liquid outlet valve in the sense of opening it slowly, until the opening corresponding to the normal flow. (Machine-translation by Google Translate, not legally binding)