US4256583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flush-back filter
Assignee: Boll and Kirch Filterbau GmbH
•
Filing: 1979-09-10
•
Granted: 1981-03-17
•
Expires: 1999-09-10
Abstract
Abstract A flush-back filter which is compact in size, simple to mount, maintain and clean. The filter consists of two side by side filter chambers, a rotary valve arranged in a housing underneath, and a piston valve slidable in the rotary valve for controlling the flow of fluid to and from the filter chambers and the discharge of any filtered out sludges.
Inventors
- 👤 Rudiger Lennartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:27
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
133 words
In a filter apparatus comprised of: a pair of filter element chambers; a valve housing having an inlet port, an outlet port, a sludge outlet port and a plurality of filter housing inlet and outlet openings; a rotary valve member in said housing and arranged to selectively interconnect said ports with said openings through internal passages in said valve housing, the improvements which comprise: said valve housing having an upwardly facing surface in which said openings are located; said surface forming a common mounting base for said pair of filter element chambers; said chambers having generally vertically extending axis; said valve member having a generally horizontal axis of rotation perpendicular to said vertical axes, and said inlet and outlet ports and said sludge outlet port all being located in a common horizontal plane.
Claim 2
Dependent Claim
133 words
In a filter apparatus comprised of: a pair of filter element chambers; a valve housing having an inlet port, an outlet port, a sludge outlet port and a plurality of filter housing inlet and outlet openings; a rotary valve member in said housing and arranged to selectively interconnect said ports with said openings through internal passages in said valve housing, the improvements which comprise: said valve housing having an upwardly facing surface in which said openings are located; said surface forming a common mounting base for said pair of filter element chambers; said chambers having generally vertically extending axis; said valve member having a generally horizontal axis of rotation perpendicular to said vertical axes, and said inlet and outlet ports and said sludge outlet port all being located in a common horizontal plane.
Claim 3
Dependent Claim
22 words
Filter apparatus according to claim 1 wherein said inlet and outlet ports lie next to each other in said common horizontal plane.
Claim 4
Dependent Claim
48 words
Filter apparatus according to claim 1 wherein said two filter chambers each have an approximately elliptical or oval cross-section, and are arranged on the valve housing in side-by-side relationship in such a way that the longitudinal axes of the elliptical or oval cross-sections are parallel with each other.
Claim 5
Dependent Claim
31 words
Filter apparatus according to claim 1 wherein on the top surface of the valve housing laterally to the filter chambers is arranged a control cylinder for switching over the rotary valve.
Claim 6
Dependent Claim
22 words
Filter apparatus according to claim 4 wherein the control cylinder is coupled by means of a rack-and-pinion gear with the rotary valve.
Claim 7
Dependent Claim
35 words
Filter apparatus according to claim 1 wherein the filter chambers are provided with a group of parallel filter cartridges, and air-vent valves are arranged at a distance underneath the upper ends of the filter cartridges.
Claim 8
Dependent Claim
42 words
Filter apparatus according to claim 1 wherein said rotary valve member has a valve seat integrally formed thereon communicating with said sludge outlet port and a reciprocable valve member in said rotary valve member movable into closing relationship with said valve seat.
Claim 9
Dependent Claim
79 words
Filter apparatus according to claim 1 wherein an insert port extends into the side of the rotary valve housing opposite the sludge outlet port, said port forming a pressure reservoir for a pneumatic flush back medium, said valve member having a cylindrical space communicating said reservoir with one of said internal passages and a plunger on a control piston selectively movable into and out of said cylindrical space for selectively communicating pressures in said reservoir with said internal passages.
Claim 10
Dependent Claim
17 words
Filter apparatus according to claim 8 wherein the rotary valve is rotatably mounted in the insert piece.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |