US3750693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solenoid operated valve
Assignee: XAR IND Inc
•
Filing: 1971-10-13
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Granted: 1973-08-07
•
Expires: 1991-10-13
Abstract
Abstract A solenoid operated valve for use within an aircraft fuel area which permits the air to enter an air intake at a forwardlylocated point in the aircraft and then to flow through the valve and into the fuel tank to pressurize it for positive expulsion of the fuel from the tank to the engine. The valve is equipped with spring bias means to maintain it in a fail-safe open position, so that only when the solenoid is actuated does the valve close and remove ram air pressure from the fuel in the tank. The valve is balanced so that differential pressures across it do not tend to open it, its operation being a function only of spring bias and energizing of a solenoid winding.
Inventors
- 👤 A Hardison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:50
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0655; F16K1/00; F16K1/12; Y; Y10; Y10T; Y10T137/00; Y10T137/3367; Y10T137/3421
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
348 words
An aircraft fuel tank pressurization system, comprising: an air Scoop; an air duct connected to the air scoop and adapted to be connected to the fuel tank; and an electrically energizable solenoid valve in said air duct for selectively permitting or preventing the flow of air from the air scoop to the fuel tank, said valve comprising a body having a tubular poppet chamber with a longitudinal axis, an air inlet port and an air outlet port passing through the body and entering said poppet chamber, a circular poppet seat surrounding said air inlet port, the longitudinal axis being normal to the poppet seat, a solenoid mounting member supported by the body and extending into the poppet chamber, a solenoid core supported on the solenoid mounting member, a solenoid winding surrounding the solenoid core, the solenoid winding having an axis parallel to the said longitudinal axis, a tubular poppet element having an open end, and an inner cylindrical wall with an inside diameter and a longitudinal axis, said wall surrounding the solenoid winding and extending axially beyond the solenoid core on its end away from the air inlet port, a bearing member holding the poppet element to the solenoid mounting member for axially slidable movement toward and away from the poppet seat, a circular poppet seal carried by the poppet element on its open end facing the poppet seat, the poppet seal having an inside diameter, a peripheral washer carried by said solenoid mounting member, the outer periphery of said washer bearing against, and making a sliding fluid seal with,the cylindrical wall of the poppet element, a bias spring forcing the poppet element away from the poppet seat, a magnetic circuit being formed by the solenoid core and by the poppet element, whereby energizing the solenoid winding by passing an electrical current therethrough draws the poppet element toward the poppet seat so the poppet seal bears against the same to close the valve, the washer being disposed between the solenoid and the air inlet port, and the poppet element, poppet seal, poppet seat, and solenoid winding being coaxial.
Claim 2
Dependent Claim
348 words
An aircraft fuel tank pressurization system, comprising: an air Scoop; an air duct connected to the air scoop and adapted to be connected to the fuel tank; and an electrically energizable solenoid valve in said air duct for selectively permitting or preventing the flow of air from the air scoop to the fuel tank, said valve comprising a body having a tubular poppet chamber with a longitudinal axis, an air inlet port and an air outlet port passing through the body and entering said poppet chamber, a circular poppet seat surrounding said air inlet port, the longitudinal axis being normal to the poppet seat, a solenoid mounting member supported by the body and extending into the poppet chamber, a solenoid core supported on the solenoid mounting member, a solenoid winding surrounding the solenoid core, the solenoid winding having an axis parallel to the said longitudinal axis, a tubular poppet element having an open end, and an inner cylindrical wall with an inside diameter and a longitudinal axis, said wall surrounding the solenoid winding and extending axially beyond the solenoid core on its end away from the air inlet port, a bearing member holding the poppet element to the solenoid mounting member for axially slidable movement toward and away from the poppet seat, a circular poppet seal carried by the poppet element on its open end facing the poppet seat, the poppet seal having an inside diameter, a peripheral washer carried by said solenoid mounting member, the outer periphery of said washer bearing against, and making a sliding fluid seal with,the cylindrical wall of the poppet element, a bias spring forcing the poppet element away from the poppet seat, a magnetic circuit being formed by the solenoid core and by the poppet element, whereby energizing the solenoid winding by passing an electrical current therethrough draws the poppet element toward the poppet seat so the poppet seal bears against the same to close the valve, the washer being disposed between the solenoid and the air inlet port, and the poppet element, poppet seal, poppet seat, and solenoid winding being coaxial.
Claim 3
Dependent Claim
81 words
A system according to claim 1 in which the inside diameters of the poppet seal and of the cylindrical wall of the poppet element are substantially equal, and in which the region inside of the poppet element and on the opposite side of the washer from the inlet port is vented to the air outlet port, whereby there is no substantial unbalanced force on the poppet element as a consequence of differential pressure between the inlet port and the outlet port.
Claim 4
Dependent Claim
26 words
A system according to claim 2 in which the poppet seal tapers outwardly from the longitudinal axis as it extends away from the air inlet port.
Claim 5
Dependent Claim
37 words
A system according to claim 2 in which that part of the solenoid mounting member which stands in the path of air flow between the air inlet port and the air outlet port has an airfoil configuration.
Claim 6
Dependent Claim
76 words
A system according to claim 1 in which a source of air pressure from another pressure source is connected to the tank, in which a pressure switch is provided that is responsive to pressure in this source, the pressure switch permits energizing of the solenoid when adequate pressure is provided by said source, and which prevents energizing otherwise, thereby permitting the valve to be opened by the bias spring to admit air from the air scoop.
Claim 7
Dependent Claim
18 words
A system according to claim 1 in which a venturi passage is formed in the air inlet port.
Claim 8
Dependent Claim
297 words
An electrically energizable solenoid valve for controlling the supply of ram air pressure to an aircraft fuel tank, comprising: a body having a tubular poppet chamber with a longitudinal axis, an air inlet port and an air outlet port passing through the body and entering said poppet chamber, a circular poppet seat surrounding said air inlet port, the longitudinal axis being normal to the poppet seat, a solenoid mounting member supported by the body and extending into the poppet chamber, a solenoid core supported on the solenoid mounting member, a solenoid winding surrounding the solenoid core, the solenoid winding having an axiS parallel to the said longitudinal axis, a tubular poppet element having an open end, and an inner cylindrical wall with an inside diameter and a longitudinal axis, said wall surrounding the solenoid winding and extending axially beyond the solenoid core on its end away from the air inlet port, a bearing member holding the poppet element to the solenoid mounting member for axially slidable movement toward and away from the poppet valve seat, a circular poppet seal carried by the poppet element on its open end facing the poppet seat, the poppet seal having an inside diameter, a peripheral washer carried by said solenoid mounting member, the outer periphery of said washer bearing against, and making a sliding fluid seal with, the cylindrical wall of the poppet element, a bias spring forcing the poppet element away from the poppet seat, a magnetic circuit being formed by the solenoid core and the poppet element, whereby energizing the solenoid winding by passing an electrical current therethrough draws the poppet element toward the poppet seat so the poppet seal bears against the same to close the valve, the washer being disposed between the solenoid and the inlet port.
Claim 9
Dependent Claim
297 words
An electrically energizable solenoid valve for controlling the supply of ram air pressure to an aircraft fuel tank, comprising: a body having a tubular poppet chamber with a longitudinal axis, an air inlet port and an air outlet port passing through the body and entering said poppet chamber, a circular poppet seat surrounding said air inlet port, the longitudinal axis being normal to the poppet seat, a solenoid mounting member supported by the body and extending into the poppet chamber, a solenoid core supported on the solenoid mounting member, a solenoid winding surrounding the solenoid core, the solenoid winding having an axiS parallel to the said longitudinal axis, a tubular poppet element having an open end, and an inner cylindrical wall with an inside diameter and a longitudinal axis, said wall surrounding the solenoid winding and extending axially beyond the solenoid core on its end away from the air inlet port, a bearing member holding the poppet element to the solenoid mounting member for axially slidable movement toward and away from the poppet valve seat, a circular poppet seal carried by the poppet element on its open end facing the poppet seat, the poppet seal having an inside diameter, a peripheral washer carried by said solenoid mounting member, the outer periphery of said washer bearing against, and making a sliding fluid seal with, the cylindrical wall of the poppet element, a bias spring forcing the poppet element away from the poppet seat, a magnetic circuit being formed by the solenoid core and the poppet element, whereby energizing the solenoid winding by passing an electrical current therethrough draws the poppet element toward the poppet seat so the poppet seal bears against the same to close the valve, the washer being disposed between the solenoid and the inlet port.
Claim 10
Dependent Claim
81 words
A valve according to claim 7 in which the inside diameters of the poppet seal and of the cylindrical wall of the poppet element are substantially equal, and in which the region inside of the poppet element and on the opposite side of the washer from the inlet port is vented to the air outlet port, whereby there is no substantial unbalanced force on the poppet element as a consequence of differential pressure between the inlet port and the outlet port.
Claim 11
Dependent Claim
26 words
A valve according to claim 8 in which the poppet seal tapers outwardly from the longitudinal axis as it extends away from the air inlet port.
Claim 12
Dependent Claim
37 words
A valve according to claim 8 in which that part of the solenoid mounting member which stands in the path of air flow between the air inlet port and the air outlet port has an airfoil configuration.
Claim 13
Dependent Claim
18 words
A system according to claim 7 in which a venturi passage is formed in the air inlet port.
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |