Patent ID: 6579447
Filing Date: 2003-06-17
Classification: B01D

Abstract:
A self-cleaning pre-filter system, said system comprising:a system inlet; a sediment filter having a filter inlet in selective fluid communication with said system inlet, a selectively openable drain port and a filter outlet, said filter inlet and said drain port being separated from said filter outlet by a filter screen; a pressure accumulator having a first chamber in open fluid communication with said filter outlet and having a sealed second chamber containing a compressible medium, said first chamber and said second chamber being separated one from the other by a flexible diaphragm; a system outlet in selective fluid communication with said filter outlet and said first chamber; and a chemical injector between said filter outlet and said first chamber, whereby the interruption of fluid communication from the system inlet and to the system outlet and the opening of said drain port facilitates fluid communication from said first chamber back through said filter screen and to said drain port, and further whereby the chemical injector delivers chemical back through said filter screen and to said drain port during fluid communication from said first chamber back through said filter screen.