US3665949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gaseous controlled fluidic throttling valve
Assignee: Bendix Corp
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Filing: 1969-06-27
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Granted: 1972-05-30
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Expires: 1989-06-27
Abstract
Abstract A fluidic throttling valve for controlling flow in a pipe or conduit of a high density fluid, such as a liquid, by injecting a lower density fluid, such as an inert gas, into the pipe. In the preferred embodiment shown herein, this control gas is injected into a pipeline leading to a combustion engine to control the quantity of liquid flowing through that pipeline. The control gas is injected through a slot extending completely around the circumference of the pipe. The gas is injected at the throat section of a venturi constructed in the pipe to define a point of minimal cross-sectional area.
Inventors
- 👤 Jerome G Rivard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:20
CPC Classifications
F; F15; F15D; F15D1/00; F15D1/02; Y; Y10; Y10S; Y10S261/00; Y10S261/69; Y10T; Y10T137/00; Y10T137/206; Y10T137/2076; Y10T137/2273; Y10T137/4456; Y10T137/4643
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
85 words
A gas injection valve for controlling the quantity of liquid flowing in a conduit comprising: a venturi in the conduit; said venturi including a throat section having a preselected minimum cross sectional area for reducing the static pressure of the liquid flowing at a preselected rate to a preselected value; and means for injecting a control gas having a lower density than the density of the liquid into the conduit at said venturi throat section to control the quantity of liquid flowing in the conduit.
Claim 2
Dependent Claim
85 words
A gas injection valve for controlling the quantity of liquid flowing in a conduit comprising: a venturi in the conduit; said venturi including a throat section having a preselected minimum cross sectional area for reducing the static pressure of the liquid flowing at a preselected rate to a preselected value; and means for injecting a control gas having a lower density than the density of the liquid into the conduit at said venturi throat section to control the quantity of liquid flowing in the conduit.
Claim 3
Dependent Claim
49 words
The valve set forth in claim 1 in which said minimum cross-sectional area is selected to reduce said static pressure for said liquid flowing at said preselected rate to a value just slightly above the vapor pressure of said flowing liquid at said point of minimum cross sectional area.
Claim 4
Dependent Claim
66 words
The valve set forth in claim 1 in which said cross-sectional area of said throat section is chosen in accordance with the equation omega l Cd At Square Root 2g Rho l (Pl - Pt). where: omega l the liquid weight rate of flow At venturi throat area Rho l liquid density Pl liquid supply pressure Cd coefficient of discharge Pt throat pressure g gravitational acceleration.
Claim 5
Dependent Claim
47 words
The valve set forth in claim 3 in which said minimum cross-sectional area is chosen so that the static pressure of said flowing liquid in said venturi throat will approach but not reach the vapor pressure of that liquid when said liquid flows at said preselected rate.
Claim 6
Dependent Claim
34 words
The valve set forth in claim 1 in which said minimum cross-sectional area is chosen to cause a predetermined portion of said flowing liquid to vaporize when said liquid flows at a preselected rate.
Claim 7
Dependent Claim
31 words
The valve set forth in claim 1 in which said venturi includes a throat section and said injecting means includes a slot extending completely around the periphery of said venturi throat.
Claim 8
Dependent Claim
24 words
The valve set forth in claim 6 in which said injection slot is arranged at an opposing angle to the direction of liquid flow.
Claim 9
Dependent Claim
30 words
The valve set forth in claim 1 in which said control gas is an inert gas, and in which said injecting means is constructed to completely stop the liquid flow.
Claim 10
Dependent Claim
86 words
In the fuel line to a piston engine a fuel control gas injection valve comprising: a venturi formed in a section of the fuel line, said venturi including a throat section having a minimum cross-sectional area for reducing the static pressure of the fuel to a preselected value; means for injecting a coNtrol gas into the fuel line at said venturi throat; and means for controlling the rate of said injection of said control gas to determine the quantity of said fuel flowing in said line.
Claim 11
Dependent Claim
86 words
In the fuel line to a piston engine a fuel control gas injection valve comprising: a venturi formed in a section of the fuel line, said venturi including a throat section having a minimum cross-sectional area for reducing the static pressure of the fuel to a preselected value; means for injecting a coNtrol gas into the fuel line at said venturi throat; and means for controlling the rate of said injection of said control gas to determine the quantity of said fuel flowing in said line.
Claim 12
Dependent Claim
82 words
The injection valve set forth in claim 9 in which said means for controlling the rate of control gas injection is constructed to inject sufficient control gas to stop fuel flow during preselected portions of successive engine cycles, is constructed to allow fuel to flow through said fuel line during other portions of successive engine cycles, and is constructed to vary engine speeds by varying the pressure at which said control gas is injected into said fuel line during said other portions.
Claim 13
Dependent Claim
83 words
The injection valve set forth in claim 9 in which said means for controlling the rate of control gas injection is constructed to inject sufficient control gas into said fuel line to stop fuel flow during preselected portions of successive engine cycles, is constructed to allow fuel to flow through said fuel line during other portions of successive engine cycles, and is constructed to vary engine speeds by varying the relative time-lengths of said preselected and said other portions of successive engine cycles.
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |