Patent US3858598A successfully refreshed from Google Patents.
US3858598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control apparatus
Assignee: Cooper Industries LLC
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Filing: 1973-03-27
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Granted: 1975-01-07
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Expires: 1993-03-27
Abstract
Abstract Control apparatus is disclosed for regulating fluid pressure in a fluid system between predetermined lower and upper limits of such pressure by comparing electrical voltages proportional to the fluid pressure in said system and to said lower and upper limits of pressure. Electrical control signals are generated in response to differences in the compared voltages to actuate solenoid operated valves connected in the fluid system for increasing the fluid pressure in the system when below said lower limit, and decreasing said fluid pressure when above said upper limit. The specific embodiment of the control system described is connected to control the pilot pressure of a pilot operated hydraulic pressure regulator.
Inventors
- 👤 Richard J Carman
- 👤 Paul R Benson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:14
CPC Classifications
G; G05; G05D; G05D16/00; G05D16/20; G05D16/2006; G05D16/2013; G05D16/2026; G05D16/2046; G05D16/2053; G05D16/2093; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/2559; Y10T137/2574; Y10T137/2605; Y10T137/2607
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
259 words
Apparatus for controlling from above sea the pressure of hydraulic fluid utilized to operate a subsea blowout preventer, comprising, in combination: a source of such hydraulic fluid; fluid conducting means adapted to be connected to such a blowout preventer to conduct said hydraulic fluid thereto; pilot pressure controlled regulator means adapted to be connected to regulate the pressure of said hydraulic fluid in response to the pressure of a pilot fluid; means for providing such a pilot fluid to said regulator means; first solenoid means connected to said regulator means to cause an increase in the pressure of said pilot fluid in response to a firSt electrical control signal; second solenoid means connected to said regulator means to cause a decrease in the pressure of said pilot fluid in response to a second electrical control signal; transducer means adapted to be connected to provide a transducer electrical signal responsive to a fluid pressure associated with the pressure of said pilot fluid; electronic comparator means adapted to be responsive to said transducer electrical signal when different from a reference electrical signal by a first pre-selected amount to provide said first electrical control signal, and responsive to said transducer electrical signal when different from such a reference electrical signal by a second pre-selected amount to provide said second electrical control signal, and remote control means adapted to be located at a central location remote from said blowout preventor to provide a reference electrical signal to said electronic comparator means substantially proportional to a pressure of said pilot fluid to be maintained.
Claim 2
Dependent Claim
259 words
Apparatus for controlling from above sea the pressure of hydraulic fluid utilized to operate a subsea blowout preventer, comprising, in combination: a source of such hydraulic fluid; fluid conducting means adapted to be connected to such a blowout preventer to conduct said hydraulic fluid thereto; pilot pressure controlled regulator means adapted to be connected to regulate the pressure of said hydraulic fluid in response to the pressure of a pilot fluid; means for providing such a pilot fluid to said regulator means; first solenoid means connected to said regulator means to cause an increase in the pressure of said pilot fluid in response to a firSt electrical control signal; second solenoid means connected to said regulator means to cause a decrease in the pressure of said pilot fluid in response to a second electrical control signal; transducer means adapted to be connected to provide a transducer electrical signal responsive to a fluid pressure associated with the pressure of said pilot fluid; electronic comparator means adapted to be responsive to said transducer electrical signal when different from a reference electrical signal by a first pre-selected amount to provide said first electrical control signal, and responsive to said transducer electrical signal when different from such a reference electrical signal by a second pre-selected amount to provide said second electrical control signal, and remote control means adapted to be located at a central location remote from said blowout preventor to provide a reference electrical signal to said electronic comparator means substantially proportional to a pressure of said pilot fluid to be maintained.
Claim 3
Dependent Claim
158 words
The apparatus of claim 1 wherein said pilot fluid pressure is to be maintained substantially within lower and upper limits of such pressure and said control means includes first electrical circuit means for providing a first reference electrical signal that is proportional to substantially said lower limit of fluid pressure; second electrical circuit means for providing a second reference electrical signal that is proportional to substantially said upper limit of fluid pressure; and said electronic comparator means includes comparator circuit means connected to said pressure transducer means and said first and second electrical circuit means and responsive to a difference between said first reference signal and said first electrical signal to provide said first electrical control signal when said fluid pressure is below said lower limit, and responsive to a difference between said second reference electrical signal and said first electrical signal to provide said second electrical control signal when said fluid pressure is above said upper limit.
Claim 4
Dependent Claim
59 words
The apparatus of claim 2 wherein said comparator circuit means includes a lower level comparator circuit responsive to said first electrical signal and said first reference signal to provide said first electrical control signal, and an upper level comparator circuit responsive to said first electrical signal and said second reference electrical signal to provide said second electrical control signal.
Claim 5
Dependent Claim
29 words
The apparatus of claim 1 wherein said means for providing such a pilot fluid is a fluid conduit connected between said regulator means and said source of hydraulic fluid.
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) | 1978-01-06 | 1978-07-08 | 1979-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-06 | 1982-07-08 | 1983-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-06 | 1986-07-08 | 1987-01-07 | $7700.00 | Window Closed / Lapsed |