Patent ID: 9616363
Date: 2017-04-11
CPC Classifications: B01D,C02F

Claim:
1. A filtration assembly for gradually screening coarse and fine particles from a flowing liquid, the assembly comprising: a filter body comprising (i) an inlet and outlet, (ii) a cylindrical coarse filtration screen having first screen openings, a first diameter and a first filtration volume, and (iii) a cylindrical fine filtration screen having second screen openings smaller than those of the coarse filtration screen and a second diameter larger than that of the coarse filtration screen, said coarse and fine filtration screens being concentrically placed into the filter body to define a second filtration volume therebetween, such that only the liquid filtered through the coarse filtration screen can be passing to said second filtration volume; an upper discharge unit comprising a coarse filtration drainage housing in fluid communication with the first filtration volume and a fine filtration drainage housing in fluid communication with the second filtration volume, said coarse and fine filtration drainage housings being equipped with corresponding discharge valves; and a cleaning means comprising a main collection arm extending through the first filtration volume and at least one lateral arm at least one end of which is connected to said main collection arm and extending through the second filtration volume in between the filtration screens, whereby the fluid communication between said second volume and the fine filtration drainage housing is provided by said at least one lateral arm.