Patent ID: 7297256
Filing Date: 2007-11-20
Classification: B01D,Y10T

Abstract:
1. A pressure gradient dosing system for a fluid supply system, comprising an additive delivery system having a fluid inlet and a fluid outlet, a flow passage including a portion extending from said inlet to said outlet, a first pressure zone along said flow passage communicating with said inlet, a second pressure zone along said flow passage communicating with outlet, said second pressure zone having a lower pressure than said first pressure zone, such that there is a pressure gradient between said first and second pressure zones, an additive reservoir responsive to said pressure gradient to release additive to said flow passage, wherein: fluid flows from upstream to downstream along said flow passage, including from said inlet to said outlet; said flow passage has a pressure reducer therealong creating said pressure gradient; said additive reservoir has first and second ports, said first port communicating with said first pressure zone, said second port communicating with said second pressure zone; said flow passage has first and second branches in parallel, said first branch being a main fluid flow branch, said second branch diverging from said main branch at said first pressure zone then passing through said additive reservoir then returning to and re-joining said main branch at said second pressure zone, said second branch flowing around and bypassing said pressure reducer; said first and second branches diverge upstream of said pressure reducer.