US3823729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure monitoring valve
Assignee: LTV Aerospace Corp
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Filing: 1973-05-07
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Granted: 1974-07-16
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Expires: 1993-05-07
Abstract
Abstract A fluid control valve of a type operable to shut off fluid flow through the valve upon the occurrence of a pressure differential above a predetermined level between two portions of a fluid system. A valve member is slidably mounted within a valve chamber and movable therein within first, second, third, fourth, and fifth positional ranges. The valve member has a passageway which provides communication through the valve between first and second ports for providing fluid flow therebetween upon the valve member being positioned within its third positional range, and also has valving means for shutting off fluid flow upon the valve member being positioned within its first or its fifth positional ranges.
Inventors
- 👤 E Swogger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:29
CPC Classifications
F; F15; F15B; F15B20/00; F15B20/004; F15B20/005; F16; F16K; F16K11/00; F16K11/02; F16K11/06; F16K11/065; F16K11/07; F16K11/0716; G; G05; G05D; G05D16/00; G05D16/028; G05D16/04; G05D16/10; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2514; Y10T137/2521; Y10T137/2559; Y10T137/265; Y10T137/2663
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
343 words
A fluid control valve of a type operable to shut off fluid flow through the valve from a source of fluid under pressure upon the occurrence of a pressure differential above a predetermined level between first and second portions of a fluid system, the valve comprising: a valve housing having a chamber and having first, second, third, and fourth ports and at least one drain opening, the first, second, third, and fourth ports and at least one drain opening having communication with the chamber, the third and fourth ports having communication, in use, with the first and second fluid system portions; a valve member slidably mounted within the chamber and movable therein within first, second, third, fourth, and fifth positional ranges, the valve member having a passageway which communicates between the first and second ports upon the valve member being positioned within its third positional range, the valve member having valving means for shutting off fluid flow between the first and second ports upon the valve member being positioned within its first positional range and, alternatively, upon the valve member being positioned within its fifth positional range; first means, responsive to any differential pressure between the third and fourth ports, for constraining the valve member within its third positional range when any difference between the pressure level within the third port and that within the fourth port is below a predetermined amount, for moving the valve member from its third to its second positional range upon the pressure in the third port falling below that in the fourth port by the predetermined amount, and for moving the valve member from its third to its fourth positional range upon the pressure in the fourth port falling below that in the third port by the predetermined amount; and second means, for moving the valve member from its second to its first positional range upon the valve member entering its second positional range, and for moving the valve member from its fourth to its fifth positional range upon the valve member entering its fourth positional range.
Claim 2
Dependent Claim
343 words
A fluid control valve of a type operable to shut off fluid flow through the valve from a source of fluid under pressure upon the occurrence of a pressure differential above a predetermined level between first and second portions of a fluid system, the valve comprising: a valve housing having a chamber and having first, second, third, and fourth ports and at least one drain opening, the first, second, third, and fourth ports and at least one drain opening having communication with the chamber, the third and fourth ports having communication, in use, with the first and second fluid system portions; a valve member slidably mounted within the chamber and movable therein within first, second, third, fourth, and fifth positional ranges, the valve member having a passageway which communicates between the first and second ports upon the valve member being positioned within its third positional range, the valve member having valving means for shutting off fluid flow between the first and second ports upon the valve member being positioned within its first positional range and, alternatively, upon the valve member being positioned within its fifth positional range; first means, responsive to any differential pressure between the third and fourth ports, for constraining the valve member within its third positional range when any difference between the pressure level within the third port and that within the fourth port is below a predetermined amount, for moving the valve member from its third to its second positional range upon the pressure in the third port falling below that in the fourth port by the predetermined amount, and for moving the valve member from its third to its fourth positional range upon the pressure in the fourth port falling below that in the third port by the predetermined amount; and second means, for moving the valve member from its second to its first positional range upon the valve member entering its second positional range, and for moving the valve member from its fourth to its fifth positional range upon the valve member entering its fourth positional range.
Claim 3
Dependent Claim
95 words
The apparatus of claim 1, the first means comprising means employing fluid under pressure received through the fourth port for moving the valve member from its third to its second positional range upon the pressure level within the third port falling below that in the fourth port by the predetermined amount, and comprising means employing fluid under pressure received through the third port for moving the valve member from its third to its fourth positional range upon the pressure level within the fourth port falling below that in the third port by the predetermined amount.
Claim 4
Dependent Claim
73 words
The apparatus of claim 2, the second means additionally comprising means, actuated by fluid under pressure received through the first port, for constraining the valve member in its first positional range upon the valve member being moved to its first positional range by the sEcond means, and alternatively, for constraining the valve member in its fifth positional range upon the valve member being moved to its fifth positional range by the second means.
Claim 5
Dependent Claim
46 words
The apparatus of claim 3, the first means including means for moving the valve member from its first to its third positional range and, alternatively, from its fifth to its third positional range, upon fluid flow into the valve through the first port being shut off.
Claim 6
Dependent Claim
43 words
The apparatus of claim 4, wherein the means for moving the valve member from its first to its third positional range and, alternatively, from its fifth to its third positional range, comprises resilient means urging the valve member toward its third positional range.
Claim 7
Dependent Claim
116 words
The apparatus of claim 1, the valve having first and second drain openings extending through the housing and additionally having fifth and sixth ports extending through the housing and adapted to communicate with a source of fluid under pressure, the apparatus further comprising means, actuable by fluid under pressure received through the sixth port, for constraining the valve member in its first positional range upon the valve member being moved to its first positional range by the second means, and means, actuable by fluid under pressure received through the fifth port, for constraining the valve member in its fifth positional range upon the valve member being moved to its fifth positional range by the second means.
Claim 8
Dependent Claim
67 words
The apparatus of claim 6, the valve member having fluid conducting means providing communication between the fifth port and the first drain opening upon the valve member being in its second, and alternatively, its first positional range, and having fluid conducting means providing communication between the sixth port and the second drain opening upon the valve member being in its fourth, and alternatively, its fifth positional range.
Claim 9
Dependent Claim
72 words
The apparatus of claim 1, the second means comprising means, actuated by fluid under pressure received through the first port, for constraining the valve member in its first positional range upon the valve member being moved to its first positional range by the second means and, alternatively, for constraining the valve member in its fifth positional range upon the valve member being moved to its fifth positional range by the second means.
Claim 10
Dependent Claim
322 words
A valve, having first, second, third, and fourth ports and at least one drain opening, for conducting fluid under pressure from the first to the second port and, alternatively, for shutting off fluid flow from the first to the second port upon the occurrence of a predetermined pressure differential between the third and fourth ports, the valve comprising: a valve housing having an axially extending chamber, the first, second, third, and fourth ports and the at least one drain opening extending through the housing; a valve member slideably mounted within the chamber and movable axially therein within first, second, third, fourth, and fifth positional ranges, the valve member having a passageway which communicates between the first and second ports upon the valve member being in its third positional range, the valve member having valving means for stopping fluid flow between the first and second ports upon the valve member being in its first positional range and, alternatively, upon the valve member being in its fifth positional range; first means, responsive to differential pressure between the third and fourth ports, for constraining the valve member within its third positional range when any difference between the pressure level within the third port and that within the fourth port is below a predetermined amount, for moving the valve member from its third to its second positional range upon the pressure in the third port falling below that in the fourth port by the predetermined amount, and for moving the valve member from its third to its fourth positional range upon the pressure in the fourth port falling below that in the third port by the predetErmined amount; and second means, for moving the valve member from its second to its first positional range upon the valve member entering its second positional range, and for moving the valve member from its fourth to its fifth positional range upon the valve member entering its fourth positional range.
Claim 11
Dependent Claim
322 words
A valve, having first, second, third, and fourth ports and at least one drain opening, for conducting fluid under pressure from the first to the second port and, alternatively, for shutting off fluid flow from the first to the second port upon the occurrence of a predetermined pressure differential between the third and fourth ports, the valve comprising: a valve housing having an axially extending chamber, the first, second, third, and fourth ports and the at least one drain opening extending through the housing; a valve member slideably mounted within the chamber and movable axially therein within first, second, third, fourth, and fifth positional ranges, the valve member having a passageway which communicates between the first and second ports upon the valve member being in its third positional range, the valve member having valving means for stopping fluid flow between the first and second ports upon the valve member being in its first positional range and, alternatively, upon the valve member being in its fifth positional range; first means, responsive to differential pressure between the third and fourth ports, for constraining the valve member within its third positional range when any difference between the pressure level within the third port and that within the fourth port is below a predetermined amount, for moving the valve member from its third to its second positional range upon the pressure in the third port falling below that in the fourth port by the predetermined amount, and for moving the valve member from its third to its fourth positional range upon the pressure in the fourth port falling below that in the third port by the predetErmined amount; and second means, for moving the valve member from its second to its first positional range upon the valve member entering its second positional range, and for moving the valve member from its fourth to its fifth positional range upon the valve member entering its fourth positional range.
Claim 12
Dependent Claim
41 words
The apparatus of claim 9, the second means comprising first and second, oppositely directioned piston face areas formed on the valve member and first and second chamber portions formed within the chamber adjacent the first and second piston face areas, respectively.
Claim 13
Dependent Claim
19 words
The apparatus of claim 10, communication being provided, through the valve member, between the first and second chamber portions.
Claim 14
Dependent Claim
43 words
The apparatus of claim 10, the valve member having fluid conducting means providing communication from the first and second chamber portions to the drain opening upon the valve member being positioned within any one of the first, second, fourth, and fifth positional ranges.
Claim 15
Dependent Claim
56 words
The apparatus of claim 12, the first means including a first resilient means, mounted within the third chamber portion, for urging the valve member from its first toward its third positional range, and a second resilient means, mounted within the fourth chamber portion, for urging the valve member from its fifth toward its third positional range.
Claim 16
Dependent Claim
56 words
The apparatus of claim 13, further comprising means preventing the first resilient means from moving the valve member, in the second direction, beyond its third positional range and means preventing the second resilient means from moving the valve member, in the first direction, beyond its third positional range and toward its first and second positional ranges.
Claim 17
Dependent Claim
105 words
The apparatus of claim 10, the valve member having fluid conducting means providing communication from the first and second chamber portions to the first port, and further comprising fluid conducting means providing restricted communication between the first chamber portion and the drain opening and substantially less restricted communication between the second chamber portion and the drain opening upon the valve member being in its second position, and further comprising means providing restricted communication between the second chamber portion and the drain opening and substantially less restricted communication between the first chamber portion and the drain opening upon the valve member being in its first position.
Claim 18
Dependent Claim
89 words
The apparatus of claim 10, the first means comprising third and fourth piston face areas formed on the valve member and third and fourth chamber portions, the third chamber portion having communication with the third piston face area and with the third port and the fourth chamber portion having communication with the fourth piston face area and with the fourth port, the first and third piston face areas facing in a first axial direction and the second and fourth piston face areas facing in a second, opposite axial direction.
Claim 19
Dependent Claim
47 words
The apparatus of claim 9, means being provided for preventing movement of the valve member from the third positional range upon the occurrence of transient differential pressures between the third and fourth ports above the predetermined level but of a duration less than a predetermined time period.
Claim 20
Dependent Claim
34 words
The apparatus of claim 10, communication being provided, through the valve member, from the first port to the first and second chamber portions upon the valve member being in any position within the chamber.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |