Patent US3638670A successfully refreshed from Google Patents.
US3638670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low to high fluid pressure interface apparatus
Assignee: Westinghouse Air Brake Co
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Filing: 1970-03-25
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Granted: 1972-02-01
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Expires: 1990-03-25
Abstract
Abstract A piloted low to high pressure analog interface valve device is provided having a gain factor determined by the area relationship of a diaphragm piston subject to a differential control force and a bellows connected to the piston and subject to delivery pressure acting in a direction opposite to the control force. A two-way, metering-type supply valve controlled by movement of the piston/bellows assembly is adapted to control the supply of fluid pressure to delivery. A bleed port continuously vents delivery chamber pressure which is established at a value determined by the valve gain factor and which is maintained against the bleed by metering action of the supply valve when the piston/bellows assembly stabilizes at some intermediate position as determined by the point at which the rate of supply pressure being metered to the delivery is able to precisely match the rate of bleed. The interface valve is also adapted to be driven by the differential outputs of a pure fluid proportional amplifier to further increase the overall gain of the interface. Valve performance may be improved at the expense of gain through a feedback signal corresponding to delivery pressure connected to oppose the control signal at the fluid amplifier.
Inventors
- 👤 Clifford W Allen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:37
CPC Classifications
F; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B3/00; F15C; F15C1/00; F15C1/14; Y; Y10; Y10T; Y10T137/00; Y10T137/2278; Y10T137/2409
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
201 words
An analog relay valve device comprising in combination: a. a casing, b. a differential piston assemblage having cooperative relationship with said casing to define first, second and third chambers, said assemblage comprising: i. a piston abutment including a diaphragm sealingly secured to said casing to separate said first and second chambers, said abutment being movable in accordance with the effective pressure differential between said first and second chambers, ii. a resilient bellows secured to said casing to separate said second and third chambers, said bellows being expanded and contracted in accordance with the effective pressure differential between said second and third chambers, said third chamber having an inlet, a bleed port, a delivery port, and iii adjustable means connecting said bellows with said piston abutment, said adjustable means providing initial deformation of said bellows to a stressed condition biasing said piston assemblage in a preselected direction, and c. valve means engageable with said bellows for controlling the rate of supply of fluid pressure at said inlet to said third chamber responsive to movement of said piston assemblage in a direction opposite said preselected direction, said piston assemblage being urged in said preselected direction in accordance with pressurization of said third chamber.
Claim 2
Dependent Claim
201 words
An analog relay valve device comprising in combination: a. a casing, b. a differential piston assemblage having cooperative relationship with said casing to define first, second and third chambers, said assemblage comprising: i. a piston abutment including a diaphragm sealingly secured to said casing to separate said first and second chambers, said abutment being movable in accordance with the effective pressure differential between said first and second chambers, ii. a resilient bellows secured to said casing to separate said second and third chambers, said bellows being expanded and contracted in accordance with the effective pressure differential between said second and third chambers, said third chamber having an inlet, a bleed port, a delivery port, and iii adjustable means connecting said bellows with said piston abutment, said adjustable means providing initial deformation of said bellows to a stressed condition biasing said piston assemblage in a preselected direction, and c. valve means engageable with said bellows for controlling the rate of supply of fluid pressure at said inlet to said third chamber responsive to movement of said piston assemblage in a direction opposite said preselected direction, said piston assemblage being urged in said preselected direction in accordance with pressurization of said third chamber.
Claim 3
Dependent Claim
73 words
The combination, as recited in claim 1, further comprising pure fluid proportional amplifier means having a first output connected to said first chamber and a second output connected to said second chamber and a pair of opposing control ports for varying fluid pressure at said outputs in accordance with the pressure differential between said control ports to provide a control pressure differential urging said piston abutment in a direction opposite said preselected direction.
Claim 4
Dependent Claim
228 words
An analog relay valve device comprising in combination: a. a casing, b. a differential piston assemblage having cooperative relationship with said casing to define first, second and third chambers, said third chamber having an inlet, a bleed port and a delivery port, c. pure fluid proportional amplifier means having a first output connected to said first chamber to urge said piston assemblage in a first direction, a second output connected to said second chamber to urge said piston assemblage in a second direction and a pair of opposing control ports for varying fluid pressure at said outputs proportionate to the pressure differential between said control ports such that one of said first and second chambers is pressurized and the other is depressurized by like amounts to provide a control pressure differential urging said piston assemblage in one of said first and second directions, and d. valve means engageable with said piston assemblage for controlling the rate of flow of fluid pressure from said inlet to said third chamber, said piston assemblage being urged in the other of said first and second directions in accordance with fluid pressure effective in said third chamber, said delivery port being connected to one of said control ports to regulate said proportional amplifier in a sense to reduce said control presSure differential in accordance with the degree of pressurization of said third chamber.
Claim 5
Dependent Claim
228 words
An analog relay valve device comprising in combination: a. a casing, b. a differential piston assemblage having cooperative relationship with said casing to define first, second and third chambers, said third chamber having an inlet, a bleed port and a delivery port, c. pure fluid proportional amplifier means having a first output connected to said first chamber to urge said piston assemblage in a first direction, a second output connected to said second chamber to urge said piston assemblage in a second direction and a pair of opposing control ports for varying fluid pressure at said outputs proportionate to the pressure differential between said control ports such that one of said first and second chambers is pressurized and the other is depressurized by like amounts to provide a control pressure differential urging said piston assemblage in one of said first and second directions, and d. valve means engageable with said piston assemblage for controlling the rate of flow of fluid pressure from said inlet to said third chamber, said piston assemblage being urged in the other of said first and second directions in accordance with fluid pressure effective in said third chamber, said delivery port being connected to one of said control ports to regulate said proportional amplifier in a sense to reduce said control presSure differential in accordance with the degree of pressurization of said third chamber.
Claim 6
Dependent Claim
47 words
The combination, as recited in claim 3, further characterized in that said delivery port is connected to one of said control ports to regulate said proportional amplifier in a sense to reduce said control pressure differential in accordance with the degree of pressurization of said third chamber.
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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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |