US3961533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential fluid-pressure transducer
Assignee: Case LLC
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Filing: 1975-04-22
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Granted: 1976-06-08
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Expires: 1995-04-22
Abstract
Abstract A differential fluid-pressure transducer having a housing with two spaced-apart fluid inlet openings and two fluid outlet openings. A spool is slidably disposed in the housing and has two oppositely-faced surfaces disposed intermediate the inlet openings, for receiving pressure from each respective inlet opening. The spool has a fluid passageway in flow communication from one of its two surfaces to a compartment at the end of the spool, whereby fluid pressure from one of the two inlet openings acts on both the one oppositely-faced surface and on the end of the spool which defines the compartment, and the fluid pressure at the other inlet opening influences the position of the spool, all for detecting the difference in pressure at the two inlet openings. Also, the spool can slide to a position which flow communicates the compartment to one of the housing outlet openings to thereby relieve pressure in the compartment. Finally, an instrument, such as a gauge or switch, can be fluid-flow attached to the other housing outlet which is in communication with the compartment to thereby detect the fluid pressure difference between the two inlet openings.
Inventors
- 👤 Milton C. Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:06
CPC Classifications
G; G01; G01L; G01L7/00; G01L7/16; G01L7/163
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
233 words
A differential fluid-pressure transducer, comprising a housing having two spaced-apart fluid inlet openings and a fluid outlet opening, a member movably disposed in said housing intermediate said inlet openings and fluid-tightly separating said inlet openings from each other, said member having thereon two areas of one size respectively and independently exposed to said inlet openings, a portion of said member and said housing together defining a compartment and said member being movable relative to said compartment in response to fluid pressure at said two areas, the area of said portion also being of said one size, a fluid passageway extending between said compartment and one of said two areas for fluid flow communication therebetween, said housing having a drain port, said member and said housing having a clearance therebetween and thereby form a variable fluid leakage path in flow communication with said compartment and said one of the said two areas and said drainport, and having said clearance arranged with a variable magnitude to alter fluid volume in accordance with the position of said member relative to said compartment while maintaining full fluid pressure exposed to said one area and when said member is moved in the direction away from said compartment, and said housing fluid outlet being in fluid-flow communication with said compartment for receiving the pressure of the fluid in said compartment in accordance with fluid pressure at said two areas.
Claim 2
Dependent Claim
233 words
A differential fluid-pressure transducer, comprising a housing having two spaced-apart fluid inlet openings and a fluid outlet opening, a member movably disposed in said housing intermediate said inlet openings and fluid-tightly separating said inlet openings from each other, said member having thereon two areas of one size respectively and independently exposed to said inlet openings, a portion of said member and said housing together defining a compartment and said member being movable relative to said compartment in response to fluid pressure at said two areas, the area of said portion also being of said one size, a fluid passageway extending between said compartment and one of said two areas for fluid flow communication therebetween, said housing having a drain port, said member and said housing having a clearance therebetween and thereby form a variable fluid leakage path in flow communication with said compartment and said one of the said two areas and said drainport, and having said clearance arranged with a variable magnitude to alter fluid volume in accordance with the position of said member relative to said compartment while maintaining full fluid pressure exposed to said one area and when said member is moved in the direction away from said compartment, and said housing fluid outlet being in fluid-flow communication with said compartment for receiving the pressure of the fluid in said compartment in accordance with fluid pressure at said two areas.
Claim 3
Dependent Claim
20 words
The differential fluid-pressure transducer as claimed in claim 1, wherein said member is a spool slidably disposed in said housing.
Claim 4
Dependent Claim
32 words
The differential fluid-pressure transducer as claimed in claim 2, wherein said spool includes two oppositely-faced annular surfaces which present said two areas, and said portion is one end surface of said spool.
Claim 5
Dependent Claim
53 words
The differential fluid-pressure transducer as claimed in claim 3, wherein said housing has a second fluid outlet, and said spool has an additional fluid passageway in fluid-flow communication with said second fluid outlet and with said compartment when said spool moves to a limit position, to thereby alter fluid volume in said compartment.
Claim 6
Dependent Claim
33 words
The differential fluid-pressure transducer as claimed in claim 4, including a fluid-pressure responsive instrument in fluid-flow communication with said fluid outlet for the detection of any fluid pressure difference at said two areas.
Claim 7
Dependent Claim
33 words
The differential fluid-pressure transducer as claimed in claim 1, including a fluid-pressure responsive instrument in fluid-flow communication with said fluid outlet for the detection of any fluid pressure difference at said two areas.
Claim 8
Dependent Claim
53 words
The differential fluid-pressure transducer as claimed in claim 1, wherein said housing has a second fluid outlet, and said member has an additional fluid passageway in fluid-flow communication with said second fluid outlet and with said compartment when said member moves to a limit position, to thereby alter fluid volume in said compartment.
Claim 9
Dependent Claim
74 words
The differential fluid-pressure transducer as claimed in claim 7, wherein said member is a spool slidably disposed in said housing and has an end extending across said second fluid outlet, said spool end and said housing being less than fluid tight and arranged to provide a fluid leakage path therebetween, and said additional fluid passageway being in fluid-flow communication with said fluid leakage path for relief of the quantity of fluid in said compartment.
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) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |