Patent US2307712A successfully refreshed from Google Patents.
US4056474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Straining valves
Assignee: Individual
•
Filing: 1976-04-19
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Granted: 1977-11-01
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Expires: 1996-04-19
Abstract
Abstract A self-cleaning straining valve having an inlet, an outlet, and a flush port, in which a rotatable plug has a plug flow passage therethrough, the plug flow passage has, in addition to first and second openings at its two ends, a third opening therefrom through the plug wall, and first and second filter areas are respectively positioned in the first and third openings, the third opening communicating with the valve inlet and the first opening communicating with both the inlet and the flush port when the plug is rotated so that the valve is in a self-cleaning position, whereby in this self-cleaning position part of the incoming fluid from the inlet flows across the first filter area and then out the flush port, to clean the first filter area, and part of the incoming fluid passes through the second filter area, being filtered as it passes therethrough, then passes into the plug flow passage, and finally passes out through the first filter area and flush port, to backflush and thereby to further clean the first filter area. There is also disclosed, for a straining valve, a closed cylindrical filter, the ends and wall of which are made of filtering material.
Inventors
- 👤 William N. Snouffer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:27
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D35/04; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/96; B01D29/965
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
287 words
A straining valve comprising: a body having an inlet, an outlet, a chamber for accommodating a valve plug, said chamber being between and communicating with said inlet and outlet, and a flush port between said inlet and outlet and communicating with said chamber, a valve plug seated in said chamber and having an axis of rotation, said plug having a plug flow passage therethrough directed transverse of said axis, said plug flow passage having first and second openings at the ends of said passage, said openings respectively aligning with said inlet and outlet for permitting fluid to flow from inlet to outlet when said plug is rotated to a first, valve-open position, and said plug passage having a third opening therefrom through the wall of said plug between said first and second openings, said first opening being large enough to communicate with both said inlet and said flush port when said plug is rotated to a second self-cleaning position, in which position said third opening communicates with said inlet, and a first filter area positioned in said first opening, and a second filter area positioned in said third opening, wherein said first filter area filters fluid passing from inlet to outlet in said first, valve-open position, and in said second position part of the fluid from said inlet flows across said first filter area and then out said flush port, to clean said first filter area, and part of the fluid from said inlet passes through said second filter area and is filtered as it passes therethrough, then passes into said plug flow passage, and finally passes out through said first filter area and flush port, to backflush and thereby to further clean the first filter area.
Claim 2
Dependent Claim
287 words
A straining valve comprising: a body having an inlet, an outlet, a chamber for accommodating a valve plug, said chamber being between and communicating with said inlet and outlet, and a flush port between said inlet and outlet and communicating with said chamber, a valve plug seated in said chamber and having an axis of rotation, said plug having a plug flow passage therethrough directed transverse of said axis, said plug flow passage having first and second openings at the ends of said passage, said openings respectively aligning with said inlet and outlet for permitting fluid to flow from inlet to outlet when said plug is rotated to a first, valve-open position, and said plug passage having a third opening therefrom through the wall of said plug between said first and second openings, said first opening being large enough to communicate with both said inlet and said flush port when said plug is rotated to a second self-cleaning position, in which position said third opening communicates with said inlet, and a first filter area positioned in said first opening, and a second filter area positioned in said third opening, wherein said first filter area filters fluid passing from inlet to outlet in said first, valve-open position, and in said second position part of the fluid from said inlet flows across said first filter area and then out said flush port, to clean said first filter area, and part of the fluid from said inlet passes through said second filter area and is filtered as it passes therethrough, then passes into said plug flow passage, and finally passes out through said first filter area and flush port, to backflush and thereby to further clean the first filter area.
Claim 3
Dependent Claim
35 words
The straining valve of claim 1 wherein said third opening intersects said first opening to cooperatively provide a first laterally enlarged plug flow passage opening in which said first and second filter areas are positioned.
Claim 4
Dependent Claim
64 words
The straining valve of claim 2 wherein said plug is rotatable to a third position in which said first filter area is positioned adjacent said port, said second filter area is exposed to incoming fluid, and said incoming fluid passes through said second filter area and out said first filter area and said port, to backflush and thereby to clean said first filter area.
Claim 5
Dependent Claim
87 words
The straining valve of claim 3 wherein said plug passage has a fourth opening thereform through the wall of said plug, said fourth opening intersects said second opening to cooperatively provide a second laterally enlarged plug flow passage opening, said valve has a third filter area positioned in said second enlarged opening, and said third filter area is exposed to incoming fluid in said third position so that incoming fluid can pass through either said second or third filter area and out through said first filter area.
Claim 6
Dependent Claim
35 words
The straining valve of claim 3 wherein said plug is rotatable to a fourth position in which a portion of said valve plug prevents flow fo fluid beyond said inlet, thereby shutting off said valve.
Claim 7
Dependent Claim
48 words
The straining valve of claim 1 further comprising a filter cylinder wherein said plug flow passage is circular in cross section, said first and second filter areas are respectively in end and wall portions of said filter cylinder, and said filter cylinder is seated within said plug passage.
Claim 8
Dependent Claim
22 words
The straining valve of claim 6 wherein said filter cylinder, including the wall and both ends thereof, is made of wire mesh.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |