Back to results
US 2014/0338293 A1Published application
Self-Cleaning Duplex Filter
OwnerJon Williams, Michael Longinventors
Life of this patent
Estimating the term…
Abstract
A duplex fluid filter assembly allows extended life between filter replacements, by automatically back-flushing one filter unit with clean fluid from another filter unit of the duplex assembly.
Claims26
A filter unit comprising:
- a housing;
- a horizontal tube plate within the housing, separating the housing into upper and lower portions;
- at least one port in the tube plate, with a respective at least one connector for a respective at least one filter cartridge to be mounted in the housing upper portion;
- a fluid outlet below the tube plate and mounted within the housing lower portion, the at least one port communicating with the fluid outlet;
- a fluid inlet into the housing upper portion;
- at least one passage between the housing upper portion and the housing lower portion;
- and
- a drain communicating with the housing lower portion.
5 more elements
A filter assembly comprising
- two filter units, each comprising:
- a housing;
- a fluid inlet port into the housing;
- at least one connector for a respective at east one filter cartridge to be mounted in the housing;
- a fluid outlet port communicating with the at least one connector so as to be in communication with an interior of a filter cartridge mounted on the at least one connector;
- and
- a drain in a lower portion of the housing;
- the assembly further comprising:
- a common inlet;
- at least one inlet valve operative to selectively connect or disconnect the fluid inlet port of each filter unit and the common inlet;
- a common outlet;
- at least one outlet valve to selectively connect or disconnect the fluid outlet of each filter unit and the common outlet;
- drain valves to selectively open and close the drain of each filter unit;
- and
- a controller operative to control the valves to place each filter unit in a selected one of a filtering mode in which the fluid inlet valve and the fluid outlet valve are open and the drain valve is closed, a back-flushing mode in which the fluid inlet valve is closed and the drain valve and at least one valve connecting the fluid outlet port with the common outlet are open, and an offline mode in which at least one of the fluid inlet valve and the fluid outlet valve is closed and the drain valve is closed.
12 more elements
A filter cartridge comprising a filter medium forming a tube and one or more shrunk-on bands encircling the tube and restraining the tube against outward pressure.
Dependencies are inferred from the claim text.