US3680586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential servo-limiter
Assignee: SERAM SARL
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Filing: 1970-10-22
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Granted: 1972-08-01
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Expires: 1990-10-22
Abstract
Abstract A differential servo-limiter for regulating flow in hydraulic circuit employs an electromagnet which acts when energized on the same side of a throttle as restricted pressure from the inlet to the differential servo-limiter to balance the pressure difference acting on the other side of the throttle valve constituting unrestricted inlet pressure, the residual flow going to the outlet being at all times dependent on the intensity only of the current to the solenoid coil.
Inventors
- 👤 Jacques Bourgeois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:47
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/0644; F16K31/0668; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0401; F15B13/0402; F15B13/044; F16K31/0648; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7787; Y10T137/7788
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
A differential servo-limiter for regulating the flow of pressurized fluid in a hydraulic circuit, said limiter comprising: first and second parts coupled together in a sealing type manner, said first part including a central chamber containing a slidable throttle valve sealably carried therein, and said Second part comprising means, mounted in a sealing type manner on said first part, for actuating said throttle valve, openings in said first part for delivering without fluid restriction, the inlet pressure of the hydraulic circuit to one side of the throttle valve, calibrated means for delivering a restricted fluid pressure to the other side of said throttle valve from said inlet, means for leading the restricted pressure from the other side of said throttle valve to the outlet, and wherein said means for actuating said throttle valve comprises an electromagnet acting, when energized, in conjunction with said restricted fluid pressure on the same side of said throttle valve and balancing the unrestricted fluid pressure acting on the other side of the throttle valve; whereby, the residual flow passing to the outlet at all times is dependent upon the intensity of the current applied to the electromagnet solenoid.
Claim 2
Dependent Claim
193 words
A differential servo-limiter for regulating the flow of pressurized fluid in a hydraulic circuit, said limiter comprising: first and second parts coupled together in a sealing type manner, said first part including a central chamber containing a slidable throttle valve sealably carried therein, and said Second part comprising means, mounted in a sealing type manner on said first part, for actuating said throttle valve, openings in said first part for delivering without fluid restriction, the inlet pressure of the hydraulic circuit to one side of the throttle valve, calibrated means for delivering a restricted fluid pressure to the other side of said throttle valve from said inlet, means for leading the restricted pressure from the other side of said throttle valve to the outlet, and wherein said means for actuating said throttle valve comprises an electromagnet acting, when energized, in conjunction with said restricted fluid pressure on the same side of said throttle valve and balancing the unrestricted fluid pressure acting on the other side of the throttle valve; whereby, the residual flow passing to the outlet at all times is dependent upon the intensity of the current applied to the electromagnet solenoid.
Claim 3
Dependent Claim
106 words
The differential servo-limiter as claimed in claim 1, wherein said electromagnet is formed of an upper element which comprises said solenoid and its plunger core, and a lower element made of magnetic material and serving as a base for the solenoid, said lower element being maintained in sealing tight manner on said upper element and being provided on the one hand with a control hole permitting passage of the push rod for transmitting movements of the solenoid plunger core to said throttle valve and being provided on the other hand with a lateral bore providing passage for restricted fluid pressure between said first and second parts.
Claim 4
Dependent Claim
42 words
The differential servo-limiter as claimed in claim 1, wherein said plunger core of said electromagnet includes fluid communication means permitting hydraulic pressurized fluid to fill the central cavity of the electromagnet and provide equal pressure at each end of the plunger core.
Claim 5
Dependent Claim
39 words
The differential servo-limiter as claimed in claim 1, in which the throttle valve comprises at one end, an annular shoulder permitting permanent access of the unrestricted inlet pressure to that end of the chamber in which the valve moves.
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) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |