US3833121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic filtration systems
Assignee: Pall Filtration and Separations Group Inc
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Filing: 1971-09-02
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Granted: 1974-09-03
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Expires: 1991-09-02
Abstract
Abstract A plastic filtration system for use with plastic extrusion machines is described. The filtration system comprises a pair of diverter spool valves incorporating special spool slots, ports, seals and seats for high pressure, high temperature applications, a pair of parallel filters in housings which permit easy removal and cleaning, and means for synchronously operating the diverter valves to prevent rapid changes in pressure drop through the system.
Inventors
- 👤 J Singleton
- 👤 Caffery W Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:29
CPC Classifications
D; D01; D01D; D01D1/00; D01D1/10; D01D1/106; B; B01; B01D; B01D35/00; B01D35/02; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/69; B29C48/691; B29C48/03; B29C48/05; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86759; Y10T137/86767
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
84 words
A filtration system for removing particulate contaminates from a fluid stream comprising: a valve body containing a pair of diverter spool valves, each having a common port and a pair of diverter ports; a pair of filter housings, each communicating with one diverter port of each spool valve; means for synchronously moving the valves'' spools to divert the flow of fluid from one filter housing to another; and, means for causing a smooth fluid flow from one filter to another without substantial pressure surges.
Claim 2
Dependent Claim
84 words
A filtration system for removing particulate contaminates from a fluid stream comprising: a valve body containing a pair of diverter spool valves, each having a common port and a pair of diverter ports; a pair of filter housings, each communicating with one diverter port of each spool valve; means for synchronously moving the valves'' spools to divert the flow of fluid from one filter housing to another; and, means for causing a smooth fluid flow from one filter to another without substantial pressure surges.
Claim 3
Dependent Claim
28 words
The filtration system of claim 1 wherein one of the spool valves comprises: a spool containing an axially oriented slot in a reduced cross-sectional zone of the spool.
Claim 4
Dependent Claim
14 words
The filtration system of claim 2 wherein: the slot opens into the common port.
Claim 5
Dependent Claim
26 words
The filtration system of claim 3 wherein: the slot opens into one diverter port or the other in response to the position of the valve spool.
Claim 6
Dependent Claim
14 words
The filtration system of claim 2 wherein: the slot does not contain any corners.
Claim 7
Dependent Claim
28 words
The filtration system of claim 2 wherein: the end walls of the slot are at approximately a 120* angle With respect to the bottom wall of the slot.
Claim 8
Dependent Claim
21 words
The filtration system of claim 1 wherein: the diverter ports are displaced from each other by an angle of approximately 60*.
Claim 9
Dependent Claim
30 words
The filtration system of claim 1 wherein one of the spool valves comprises: a spool having a zone of reduced cross-sectional dimension terminated at each end by a sealing shoulder.
Claim 10
Dependent Claim
27 words
The filtration system of claim 1 comprising in addition: a pair of filters, each located in one of the filter housings, for removing particulate contaminants from plastic.
Claim 11
Dependent Claim
23 words
The filtration system of claim 1 wherein: a filter housing may be removed from the valve body while the system is in use.
Claim 12
Dependent Claim
15 words
The filtration system of claim 1 wherein: the filter housings each contain an air vent.
Claim 13
Dependent Claim
33 words
The filtration system of claim 1 comprising in addition: a vernier connected to one of the spool valves whereby a fine adjustment can be made of one valve with respect to the other.
Claim 14
Dependent Claim
84 words
A spool valve comprising: a valve body containing a common port and a diverter port opening into a spool chamber and having a sealing seat located between the common port and the diverter port; a valve spool having a zone of reduced crosssectional dimension terminated at one end by a sealing shoulder having a contour matching the sealing seat; means for moving the spool to operate the throttling of the valve; and, means operably associated with the spools to substantially prevent non-flow portions therein.
Claim 15
Dependent Claim
84 words
A spool valve comprising: a valve body containing a common port and a diverter port opening into a spool chamber and having a sealing seat located between the common port and the diverter port; a valve spool having a zone of reduced crosssectional dimension terminated at one end by a sealing shoulder having a contour matching the sealing seat; means for moving the spool to operate the throttling of the valve; and, means operably associated with the spools to substantially prevent non-flow portions therein.
Claim 16
Dependent Claim
22 words
The spool valve of claim 13 wherein the spool contains: an axially oriented slot in a reduced cross-sectional zone of the spool.
Claim 17
Dependent Claim
14 words
The spool valve of claim 14 wherein: the slot opens into the common port.
Claim 18
Dependent Claim
14 words
The spool valve of claim 14 wherein: the slot does not contain any corners.
Claim 19
Dependent Claim
28 words
The spool valve of claim 14 wherein: the end walls of the slot are at approximately a 120* angle with respect to the bottom wall of the slot.
Claim 20
Dependent Claim
29 words
The spool valve of claim 13 wherein: the axis of one of the ports is displaced from the axis of the spool chamber by an angle of approximately 120*.
Claim 21
Dependent Claim
18 words
The spool valve of claim 13 comprising in addition: a second diverter port opening into the spool chamber.
Claim 22
Dependent Claim
22 words
The spool valve of claim 19 wherein: the second diverter port is separated from the first diverter port by the common port.
Claim 23
Dependent Claim
47 words
The spool valve of claim 20 wherein: a second sealing seat is located between the second diverter port and the common port, and a second sealing shoulder having a contour matching the second sealing seat terminating the other end of the spool''s zone of reduced cross-sectional dimension.
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |