US3773073A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatic logic valve
Assignee: Westinghouse Air Brake Co
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Filing: 1971-06-24
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Granted: 1973-11-20
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Expires: 1991-06-24
Abstract
Abstract A fluid pressure logic valve device for producing an output signal of limited duration, regardless of the duration of the input signal, by utilizing the drop in pressure characteristic of fluid pressure flowing through a constricted opening, such constriction, through which supply pressure for the output signal flows, being formed by the proximity of an adjacent side of a valve member to a cooperating valve seat, the valve member being subjected on the opposite side, at a controlled rate, to the same fluid pressure supplied for the output signal. As the pressure acting on the opposite side of the valve member tends to approach or exceed the differential pressure value between the upstream and downstream areas of the constriction and acting on the one side of the valve member, said valve member tends to close, thereby further constricting the flow path, further reducing the set fluid pressure acting on said one side of the valve member, and thus causing positive seating of said valve member to cut off the output signal. Continuance and duration of the input signal is of no consequence once the valve member is in its cut-off position.
Inventors
- 👤 D Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/12; F16K7/14; F16K7/17; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7783; Y10T137/7784; Y10T137/7787; Y10T137/7788; Y10T137/7791
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
226 words
A logic valve device comprising: a. a casing having formed therein a fluid pressure control chamber comprising a timing volume and a fluid pressure supply chamber; b. a diaphragm-valve member fixed in said casing for sealingly isolating said control chamber from said supply chamber; c. supply passage means via which fluid pressure may be supplied simultaneously to said control chamber and said supply chamber; d. an outlet in said casing normally communicating with said supply chamber via a flow area disposed between said diaphragmvalve member and said outlet and via which outlet a fluid pressure impulse may be delivered; and e. an annular valve seat surrounding one end of said outlet and axially spaced apart from one side of said diaphgragm-valve member adjacent the flow area and in such proximity thereto as to form a constricting gap in said flow area for providing an effective reduction of fluid pressure on the downstream side of said flow area and, therefore, a resulting reduction of fluid pressure acting on said one side of said diaphragm-valve member for rendering buildup of fluid pressure in the control chamber and acting on the opposite side of said diaphragm-valve member effective for moving said diaphragm-valve member to a cut-off position relative to said valve seat and in which flow of fluid pressure through said flow area to said outlet is cut off.
Claim 2
Dependent Claim
226 words
A logic valve device comprising: a. a casing having formed therein a fluid pressure control chamber comprising a timing volume and a fluid pressure supply chamber; b. a diaphragm-valve member fixed in said casing for sealingly isolating said control chamber from said supply chamber; c. supply passage means via which fluid pressure may be supplied simultaneously to said control chamber and said supply chamber; d. an outlet in said casing normally communicating with said supply chamber via a flow area disposed between said diaphragmvalve member and said outlet and via which outlet a fluid pressure impulse may be delivered; and e. an annular valve seat surrounding one end of said outlet and axially spaced apart from one side of said diaphgragm-valve member adjacent the flow area and in such proximity thereto as to form a constricting gap in said flow area for providing an effective reduction of fluid pressure on the downstream side of said flow area and, therefore, a resulting reduction of fluid pressure acting on said one side of said diaphragm-valve member for rendering buildup of fluid pressure in the control chamber and acting on the opposite side of said diaphragm-valve member effective for moving said diaphragm-valve member to a cut-off position relative to said valve seat and in which flow of fluid pressure through said flow area to said outlet is cut off.
Claim 3
Dependent Claim
47 words
A logic valve device, as set forth in claim 1, further characterized by choke means of predetermined flow capacity interposed in said supply passage means for delaying buildup of fluid pressure in said control chamber and consequent cut off of fluid pressure flow to said outlet accordingly.
Claim 4
Dependent Claim
20 words
A logic valve device, as set forth in claim 2, wherein the flow capacity of said choke means is variable.
Claim 5
Dependent Claim
111 words
A logic valve device, as set forth in claim 2, wherein said diaphragm-valve member normally occupies an unseated position relative to said valve seat and in which unseated position of said diaphragm-valve member said supply chamber is in communication with said outlet, said diaphragm-valve member being operable responsively to buildup of fluid pressure acting on said opposite side of said diaphragm-valve member to a value sufficient for overcoming the pressure acting on said one side, as determined by the differential pressure between the upstream side and downstream side of said flow area, to a seated position on said valve seat for effecting said cut off of fluid pressure to the outlet.
Claim 6
Dependent Claim
43 words
A logic valve device, as set forth in claim 4, further characterized by an atmospheric bleed port tapped off said outlet for assuring flow of fluid pressure through said conStriction means as long as said diaphragm-valve member is in its said unseated position.
Claim 7
Dependent Claim
27 words
A logic valve device, as set forth in claim 5, wherein said timing volume, said choke means, and said bleed port are disposed externally of said casing.
Claim 8
Dependent Claim
31 words
A logic valve device, as set forth in claim 6, wherein the size of said timing volume and the respective flow capacities of said choke means and bleed port are variable.
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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |