US3677293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid flow control systems
Assignee: Westland Group PLC
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Filing: 1966-02-10
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Granted: 1972-07-18
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Expires: 1986-02-10
Abstract
Abstract A fluid flow control system for controlling conditions of flow in first and second ducts. A signal representing a condition in one duct is supplied to a fluid amplifying device, the output of which operates a control apparatus to vary the operating conditions, preferably in another fluid flow duct.
Inventors
- 👤 Owen D Furlong
- 👤 Alan C Rowe
- 👤 Eric F Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:25
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/06; B64D13/08; B64D13/02; B64D13/04; F; F15; F15C; F15C1/00; F15C1/006; Y; Y10; Y10T; Y10T137/00; Y10T137/206; Y10T137/2065; Y10T137/2071; Y10T137/8593
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
240 words
A fluid flow control system for controlling conditions of flow in a first fluid flow duct in response to conditions existing in a second fluid flow duct, the two ducts being related such that conditions in the first fluid flow duct, in turn affect conditions in the second fluid flow duct, comprising a sensing means positioned for sensing a condition in the second fluid flow duct and supplying a signal representative of said condition, a fluid flow amplifying device including at least one amplifying stage having a power nozzle and first and second opposing control nozzles, power source means for supplying pressurized fluid through fluid passages to said power nozzle and also to said control nozzles, said amplifying device also including an output passage, the said fluid flow passages of the said amplifying device forming a separate fluid flow system free from fluid communication with said first duct, means for varying the pressure at one of the control nozzles of the said pressurized fluid supplied from the power source in response to said signal, means for conveying said signal to said pressure varying means, a control means for changing the conditions in the first fluid flow duct and hence also indirectly changing the conditions in the second fluid flow duct and a control device connected to and operable in resPonse to the change in pressure in the said output passage of the amplifying device operatively connected to the control means.
Claim 2
Dependent Claim
240 words
A fluid flow control system for controlling conditions of flow in a first fluid flow duct in response to conditions existing in a second fluid flow duct, the two ducts being related such that conditions in the first fluid flow duct, in turn affect conditions in the second fluid flow duct, comprising a sensing means positioned for sensing a condition in the second fluid flow duct and supplying a signal representative of said condition, a fluid flow amplifying device including at least one amplifying stage having a power nozzle and first and second opposing control nozzles, power source means for supplying pressurized fluid through fluid passages to said power nozzle and also to said control nozzles, said amplifying device also including an output passage, the said fluid flow passages of the said amplifying device forming a separate fluid flow system free from fluid communication with said first duct, means for varying the pressure at one of the control nozzles of the said pressurized fluid supplied from the power source in response to said signal, means for conveying said signal to said pressure varying means, a control means for changing the conditions in the first fluid flow duct and hence also indirectly changing the conditions in the second fluid flow duct and a control device connected to and operable in resPonse to the change in pressure in the said output passage of the amplifying device operatively connected to the control means.
Claim 3
Dependent Claim
65 words
A fluid flow control device as claimed in claim 1 including a power source means for supplying pressurized fluid to operate the control means, and wherein said control device is a bleed valve for controlling the pressure in the fluid line between the power source means and the control means, and wherein the output of the amplifying device determines the opening of said bleed valve.
Claim 4
Dependent Claim
29 words
A fluid flow control system as claimed in claim 2 wherein said fluid amplifying devices and said control means are supplied with pressurized fluid derived from a common source.
Claim 5
Dependent Claim
89 words
A fluid flow control system as claimed in claim 1 wherein said first and second ducts are first and second cooperating ducts in heat conducting relationship with each other in a heat exchanger, the first duct being the temperature control duct and the second duct being main fluid flow duct, said sensing means comprising a device for sensing the temperature in the main fluid flow duct and said control means being a valve device for regulating the flow of fluid through the temperature control duct into the heat exchanger.
Claim 6
Dependent Claim
67 words
A fluid flow control system as claimed in claim 4 including a power source means for supplying pressurized fluid to operate the control means, and wherein said control device is a bleed valve for controlling the pressure in the fluid line between the power source means and the valve actuator device and wherein the said output of the amplifying device determines the opening of said bleed valve.
Claim 7
Dependent Claim
20 words
A fluid flow control system as claimed in claim 5 wherein said sensing means is a differential expansion thermal sensor.
Claim 8
Dependent Claim
63 words
A fluid flow control system as claimed in claim 1 wherein said first and second ducts are fluid inlet and outlet ducts, respectively, for circulating fluid through a radioactive device, said sensing means comprises a means for detecting the level of radiation in the outlet duct, and wherein the control means is operable to regulate the flow of fluid in said inlet duct.
Claim 9
Dependent Claim
53 words
A fluid flow control system in claim 7 including a first linear actuator operable in response to said radiation detector for constituting the said means for operating one of said control nozzles, and including a second linear actuator operable in response to the output of the amplifying device for operating said control means.
Claim 10
Dependent Claim
32 words
A fluid flow control system as claimed in claim 8 wherein said control means comprises a pump operated in response to the second linear actuator for pumping fluid into said inlet duct.
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |