Patent ID: 7879248
Filing Date: 2011-02-01
Classification: B01D,C02F

Abstract:
1. A filter system comprising: a distribution valve operable to direct a received fluid stream to a first outlet during a first cycle and a second outlet during a second cycle; a filtering system including first and second filters and operable to: a first valve for coupling fluid from the first outlet of the distribution valve through the first filter in a forward direction and through the second filter in a reverse direction; a second valve having an inlet for receiving fluid for controlling the reverse direction fluid flow through the second filter to control back-flushing duration, the second valve comprising: a third valve including another float mechanism for receiving fluid for controlling reverse direction fluid flow through the first filter to control back-flushing duration during the second cycle; and a fourth valve for providing fluid to the third valve to cause the float mechanism of the third valve to impede flow through the third valve during the first cycle; a fifth valve for coupling fluid from the second outlet of the distribution valve through the second filter in a forward direction and through the first filter in a reverse direction during the second cycle; and a sixth valve for providing fluid to the flow conduit of the second valve to cause the float mechanism to impede flow through the flow conduit of the second valve during the second cycle.