US3708207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure booster valve
Assignee: Dynamic Air Inc
•
Filing: 1971-04-16
•
Granted: 1973-01-02
•
Expires: 1991-04-16
Abstract
Abstract A pneumatic conveyor tube booster valve constructed from an annular tapered rubber sleeve in line with the tube and a sealed pressurized housing surrounding the sleeve portion of the tube. Pressurized gas introduced into the housing escapes past the rubber sleeve when the tube pressure drops below the housing pressure by a predetermined amount and enters the tube in substantially the same direction in which material in the tube is moving. Annular lips on the conveyor tubes supports the rubber sleeve against pressures in the tube.
Inventors
- 👤 J Steele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:32
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/34; B65G53/58; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/7888; Y10T137/7889
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
151 words
In pneumatic conveying apparatus a booster valve in combination with a conveying tube comprising: a pressure tight housing disposed about the tube in fluid communication with the inside of the tube by means of an opening through the wall of the tube; a generally annular flexible member covering the tube opening; a rigid annular lip extending over the length of the tube opening surrounding said flexible member for providing support therefor against back pressures in the tube; passageways through said lip; said flexible member operable by means of pressure induced flexing displacement to permit the flow of fluid from said passageways into said tube if the pressure in the housing exceeds the pressure in the tube by a predetermined amount but resistant to flow from said tube into said housing; and a source of fluid pressure connected to said housing adapted to present a substantially constant predetermined pressure to said passageways.
Claim 2
Dependent Claim
151 words
In pneumatic conveying apparatus a booster valve in combination with a conveying tube comprising: a pressure tight housing disposed about the tube in fluid communication with the inside of the tube by means of an opening through the wall of the tube; a generally annular flexible member covering the tube opening; a rigid annular lip extending over the length of the tube opening surrounding said flexible member for providing support therefor against back pressures in the tube; passageways through said lip; said flexible member operable by means of pressure induced flexing displacement to permit the flow of fluid from said passageways into said tube if the pressure in the housing exceeds the pressure in the tube by a predetermined amount but resistant to flow from said tube into said housing; and a source of fluid pressure connected to said housing adapted to present a substantially constant predetermined pressure to said passageways.
Claim 3
Dependent Claim
44 words
The apparatus of claim 5 in which the outer surface of said flexible member is tapered so that said flexing displacement opens a path from the passageways to the tube opening which is generally in the direction of flow of material in said tube.
Claim 4
Dependent Claim
33 words
The apparatus of claim 2 including at least one pressure ridge on the tube contacting surface of said flexible member operable to insure a tight seal between said tube and said flexible member.
Claim 5
Dependent Claim
40 words
The apparatus of claim 2 in which said passageways comprise a plurality of holes arranged generally orthogonal to the flow of material in said tube through which fluid passes from said housing against the tapered surface of said flexible member.
Claim 6
Dependent Claim
33 words
The apparatus of claim 4 in which said annular lip extends beyond the length of the tube opening so as to overlap an end of the tube with said annular flexible member therebetween.
Claim 7
Dependent Claim
49 words
The apparatus of claim 5 in which the ratio of the area of said annular lip supporting said flexible member over the length of the tube opening to the area of said plurality of holes lies in the range of about 10 to 1 to about 500 to 1.
Claim 8
Dependent Claim
13 words
The apparatus of claim 6 in which said ratio is about 30 to
References Cited (Backward Citations)
US1733302A
Cited
US2265615A
Cited
US2489715A
Cited
US3065761A
Cited
US2794686A
Cited
US2897005A
Cited
US2946628A
Cited
US3499461A
Cited
US3539149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |