The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 25, 1977
Filed:
Apr. 08, 1976
Melvin F Hinton, La Jolla, CA (US);
Reed Irrigation Systems, El Cajon, CA (US);
Abstract
A filtration system which may include multiple filters capable of being individually washed of clogging filtrate material by a 'blow-down' or flushing operation, is regulated by a blow-down controller device. Each filter has a blow-down discharge valve which is normally maintained closed by a required level of fluid pressure in a pilot line connected to the valve. This pressure is supplied by the controller device, which draws pressure from an inlet line feeding all the filters. When the controller relieves pressure in one of the pilot lines, the filter associated with that pilot line is subjected to blow-down for a predetermined time period. To determine when blow-down of one or more filters is required, the controller senses pressure differential between the common inlet line and a common filter outlet line. When the pressure differential reaches a certain level, it indicates that the filters are sufficiently clogged by filtrate to require blow-down. The controller initiates blow-down in one or more of the filters sequentially, returning to the sensing mode after each blow-down cycle, until the pressure differential drops below the level indicative of the need for cleaning.