US3581760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve
Assignee: CALIFORNIA CONTROLS COMPANY A CORP OF CA
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Filing: 1969-02-14
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Granted: 1971-06-01
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Expires: 1989-02-14
Abstract
Abstract A valve is described for venting a first pressure region upon the occurrence of a drop in pressure in a second pressure region. Also described is a pneumatic sensing circuit using such a valve. The valve includes a housing defining a valve chamber in which a movable closure member operates to open and close a vent passage for the first pressure region. Upon a drop in pressure of the given magnitude in the second pressure region, the closure means moves to a position wherein the vent passage is opened to relieve pressure, in the first pressure region.
Inventors
- 👤 Benjamin W West
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:29
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/36; F16K31/38; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2574; Y10T137/2605
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
233 words
A valve for venting a first pressure region upon the occurrence of a drop in pressure of a given magnitude in a second pressure region, comprising, a housing defining a valve chamber, a vent passage communicating with said valve chamber, closure means disposed within said valve chamber and forming a pressure barrier between first and second sections of said valve chamber, said closure means being displaceable between a first position wherein said vent passage is effectively closed to a second position wherein said vent passage is open and communicating with said first section, a first port in said housing for communicating between said first section of said chamber and the first pressure region, a second port in said housing for communicating between said second section of said chamber and the second pressure region, biasing means for holding said closure means in the first position when the pressure differential between said first and second sections is less than a predetermined level, and an equalization passage in said housing communicating between said first and second sections, said equalization passage having a cross section to sufficiently inhibit flow from said first section to said second section upon a drop in pressure of the given magnitude in the second pressure region as to create a pressure differential of at least the predetermined magnitude between said first and second sections and overcome the force of said biasing means.
Claim 2
Dependent Claim
233 words
A valve for venting a first pressure region upon the occurrence of a drop in pressure of a given magnitude in a second pressure region, comprising, a housing defining a valve chamber, a vent passage communicating with said valve chamber, closure means disposed within said valve chamber and forming a pressure barrier between first and second sections of said valve chamber, said closure means being displaceable between a first position wherein said vent passage is effectively closed to a second position wherein said vent passage is open and communicating with said first section, a first port in said housing for communicating between said first section of said chamber and the first pressure region, a second port in said housing for communicating between said second section of said chamber and the second pressure region, biasing means for holding said closure means in the first position when the pressure differential between said first and second sections is less than a predetermined level, and an equalization passage in said housing communicating between said first and second sections, said equalization passage having a cross section to sufficiently inhibit flow from said first section to said second section upon a drop in pressure of the given magnitude in the second pressure region as to create a pressure differential of at least the predetermined magnitude between said first and second sections and overcome the force of said biasing means.
Claim 3
Dependent Claim
57 words
A valve according to claim 1 wherein said closure means comprise at least one membrane extending transversely of said valve chamber between said first and second sections thereof, and a piston structure supported by said membrane, said piston structure having a first area facing on said first section and a second area facing towards said second section.
Claim 4
Dependent Claim
51 words
A valve according to claim 2 wherein said first section includes a nozzle portion between said orifice and said vent passage, and wherein said piston structure includes a seal member for closing said nozzle portion when said closure means are in said first position to thereby effectively close said vent passage.
Claim 5
Dependent Claim
71 words
A valve according to claim 2 wherein a further vent passage is provided generally parallel with said first-named vent passage, said further vent passage being positioned to be opened after said first-named vent passage upon movement of said closure means from said first position to said second position, and closed before closure of said first-named vent passage upon movement of said closure means from said second position to said first poSition.
Claim 6
Dependent Claim
63 words
A valve according to claim 2 wherein said closure means comprise a further membrane extending transversely of said valve chamber between said first and second sections thereof and facing on said second section of said valve chamber, said further membrane engaging said second area of said piston, and wherein means are provided for venting the space between said membrane and said further membrane.
Claim 7
Dependent Claim
72 words
A valve according to claim 2 wherein said piston structure blocks said membrane from said first section when in said first position and does not when in said second position, whereby the area of said diaphragm is added to said first area of said piston in said second position to hold said vent passage open even though the pressure differential between said first and second sections is less than the predetermined magnitude.
Claim 8
Dependent Claim
70 words
A valve according to claim 6 wherein means are provided for producing a second predetermined pressure differential across said vent passage upon a rise in pressure in said first section above the vent pressure, and wherein said biasing means are selected to displace said closure means to the first position when the pressure differential between said first and second sections has become about equal to the second predetermined pressure differential.
Claim 9
Dependent Claim
49 words
A valve according to claim 7 wherein the first area of said piston, the effective area of said membranes, and the force of said biasing means are selected to provide a ratio of the first predetermined pressure differential to the second predetermined pressure differential of about 10 to 1.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |