US3756285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow control apparatus
Assignee: UK Secretary of State for Defence
•
Filing: 1971-10-14
•
Granted: 1973-09-04
•
Expires: 1991-10-14
Abstract
Abstract A fluid flow apparatus which will permit a varying quantity of fluid to be bled from a main fluid supply without substantially affecting the rate of flow of the main fluid supply.
Inventors
- 👤 C Johnson
- 👤 H Cantwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:31
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2087; Y10T137/2098; Y10T137/2109
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
Fluid flow control apparatus comprising: a main fluid supply line; duct means; means connecting said duct means directly to said main fluid supply line; a discharge duct; means connecting said discharge duct directly to said duct means; a bleed duct; means connecting said bleed duct to said duct means; said main fluid supply line and said duct means carrying a continuous flow of fluid to said discharge duct and said bleed duct when the apparatus is in use; and control means, said control means being arranged to control the rate of flow of fluid flowing through said bleed duct from said continuous flow through said duct means in accordance with pressure in said discharge duct whereby the rate of flow of fluid in said bleed duct is increased and the rate of flow of fluid in said discharge duct decreases as said pressure in said discharge duct increases, and the rate of flow of fluid in said bleed duct is decreased and the rate of flow of fluid in said discharge duct increases as said pressure in said discharge duct decreases.
Claim 2
Dependent Claim
181 words
Fluid flow control apparatus comprising: a main fluid supply line; duct means; means connecting said duct means directly to said main fluid supply line; a discharge duct; means connecting said discharge duct directly to said duct means; a bleed duct; means connecting said bleed duct to said duct means; said main fluid supply line and said duct means carrying a continuous flow of fluid to said discharge duct and said bleed duct when the apparatus is in use; and control means, said control means being arranged to control the rate of flow of fluid flowing through said bleed duct from said continuous flow through said duct means in accordance with pressure in said discharge duct whereby the rate of flow of fluid in said bleed duct is increased and the rate of flow of fluid in said discharge duct decreases as said pressure in said discharge duct increases, and the rate of flow of fluid in said bleed duct is decreased and the rate of flow of fluid in said discharge duct increases as said pressure in said discharge duct decreases.
Claim 3
Dependent Claim
31 words
Fluid flow control apparatus as claimed in claim 1 wherein said bleed duct is connected to said duct means upstream of the connection between said discharge duct and said duct means.
Claim 4
Dependent Claim
31 words
Fluid flow control apparatus as claimed in claim 2 wherein said control means comprises a vortex valve, means connecting said vortex valve with both said duct means and said bleed duct.
Claim 5
Dependent Claim
50 words
Fluid flow control apparatus as claimed in claim 3 wherein said vortex valve has at least one tangential port and means connecting said at least one tangential port to said duct means, and said vortex valve has a central port and means connecting said centrol port to said bleed duct.
Claim 6
Dependent Claim
32 words
Fluid flow control apparatus as claimed in claim 4 wherein said vortex valve has two tangential ports which are mutually opposed and means connecting said two tangential ports to said duct means.
Claim 7
Dependent Claim
32 words
Fluid flow control apparatus as claimed in claim 5 wherein said two tangential ports are connected to said duct means one on each side of a restrictor arranged in said duct means.
Claim 8
Dependent Claim
34 words
Fluid flow control apparatus as claimed in claim 6 wherein a further restrictor is located between the said duct means and said tangential port connected to said duct means upstream of said firstmentioned restrictor.
Claim 9
Dependent Claim
45 words
Fluid flow control apparatus as claimed in claim 4 wherein said vortex valve has one tangential port and one radial port and means connecting both said ports to said duct means, said tangential port being connected to said duct means upstream of said radial port.
Claim 10
Dependent Claim
35 words
Fluid flow control apparatus as claimed in claim 8 wherein said tangential port and said radial port are connected to said duct means one on each side of a restrictor arranged in said duct means.
Claim 11
Dependent Claim
23 words
Fluid flow control apparatus as claimed in claim 9 wherein a further restrictor is located between said duct means and said tangential port.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |