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:
Jul. 24, 2012
Filed:
May. 17, 2006
John L. Geibel, Butler, PA (US);
John L. Geibel, Butler, PA (US);
Xylem Water Solutions Zelienople, LLC, Zelienople, PA (US);
Abstract
A backwash distribution apparatus for a filter having a filter tank and a plurality of underdrain laterals includes a first and second separator device positioned in a common main conduit to define first and second auxiliary flumes. The first and second auxiliary flumes are in fluid communication with the common main conduit and the underdrain laterals. The first separator device has at least one flume liquid metering orifice preferably located near the bottom of the first separator device so that it may be below a gas liquid interface in the first auxiliary flume. The second separator device has either a weir edge or a plurality of metering orifices (or both) for passing backwash liquid from the common main conduit into the second auxiliary flume. The second separator device creates an adequate liquid pool in the common main conduit to prevent short circuiting of gas into a liquid opening for the common main conduit and also to provide low velocity flow of backwash liquid therein, while also providing uninhibited flow of backwash gas. The second separator also controls the distribution of backwash liquid and/or gas inside the common main conduit. A method for gas backwash in the presence of liquid according to the invention is also disclosed.