GB988780A - Improvements in or relating to devices for maintaining between two predetermined values the pressure in hydraulic circuits - Google Patents
Improvements in or relating to devices for maintaining between two predetermined values the pressure in hydraulic circuitsInfo
- Publication number
- GB988780A GB988780A GB371962A GB371962A GB988780A GB 988780 A GB988780 A GB 988780A GB 371962 A GB371962 A GB 371962A GB 371962 A GB371962 A GB 371962A GB 988780 A GB988780 A GB 988780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pressure
- accumulator
- drain
- supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/027—Installations or systems with accumulators having accumulator charging devices
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/14—Control of fluid pressure with auxiliary non-electric power
- G05D16/16—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid
- G05D16/166—Control of fluid pressure with auxiliary non-electric power derived from the controlled fluid using pistons within the main valve
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/2496—Self-proportioning or correlating systems
- Y10T137/2559—Self-controlled branched flow systems
- Y10T137/2574—Bypass or relief controlled by main line fluid condition
- Y10T137/2605—Pressure responsive
- Y10T137/2622—Bypass or relief valve responsive to pressure downstream of outlet valve
- Y10T137/2625—Pilot valve
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Fluid-Pressure Circuits (AREA)
- Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
Abstract
988, 780. Fluid-pressure servomotor systems. ANDRE CITROEN S.A. Jan. 31, 1962 [Feb. 28, 1961], No. 3719/62. Heading G3P. A device for maintaining pressure in an accumulator Ac between two predetermined limits, the accumulator being supplied with fluid from a supply A past a non-return valve S and having an outlet Y to a circuit comprises two slide valves T<SP>1</SP>, T<SP>2</SP> subjected at one end to accumulator pressure and loaded to the position shown by springs R<SP>1</SP>, R<SP>2</SP> in separate chambers E<SP>1</SP>, E<SP>2</SP>. The spring R1 is calibrated to balance a force due to the lower limit pressure acting on valve T<SP>1</SP> and spring R<SP>2</SP> is calibrated to balance the upper limit pressure. The chamber E<SP>1</SP> is connected to the supply A by a restricted passage F and to drain B by a passage H under control of the valve T<SP>2</SP>. The chamber E<SP>2</SP> is connected to the drain B by a passage K and the valve T<SP>1</SP> controls connection of the supply A to the drain B. In operation fluid is fed to the accumulator until its pressure reaches the upper limit when valve T<SP>2</SP> moves downwards to open chamber E<SP>1</SP> to drain. The fall in pressure in chamber E<SP>1</SP> allows the valve T<SP>1</SP> to move downwards and connect the supply A to drain B. When the pressure in the accumulator drops below the upper limit the valve T<SP>2</SP> moves upwards but due to the restricted passage F, the valve T<SP>1</SP> remains open until the pressure in the accumulator reaches the lower limit when the valve T<SP>1</SP> again closes. If the fall in the accumulator is slow the valve T<SP>1</SP> closes before the lower limit is reached.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR854172A FR1290260A (en) | 1961-02-28 | 1961-02-28 | Device maintaining the pressure in hydraulic circuits between two given values |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB988780A true GB988780A (en) | 1965-04-14 |
Family
ID=8749847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB371962A Expired GB988780A (en) | 1961-02-28 | 1962-01-31 | Improvements in or relating to devices for maintaining between two predetermined values the pressure in hydraulic circuits |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US3149639A (en) |
| BE (1) | BE612936A (en) |
| ES (1) | ES274038A1 (en) |
| FR (1) | FR1290260A (en) |
| GB (1) | GB988780A (en) |
| LU (1) | LU41303A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR84166E (en) * | 1963-07-17 | 1964-12-04 | Citroen Sa Andre | Device maintaining the pressure in hydraulic circuits between two given values |
| GB8714519D0 (en) * | 1987-06-20 | 1987-07-22 | Vickers Systems Ltd | Hydraulic latch device |
| FR2637324B1 (en) * | 1988-10-04 | 1994-02-25 | Peugeot Automobiles | SAFETY CONTROL DEVICE FOR ELECTRIC PUMP |
| FR2760796B1 (en) * | 1997-03-14 | 2001-10-26 | Peugeot | HYDRAULIC CIRCUIT-BREAKER DEVICE AND MOTOR VEHICLE EQUIPPED WITH THIS DEVICE |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2655169A (en) * | 1947-04-24 | 1953-10-13 | Electraulic Presses Ltd | Autoamtic unloading valve for hydraulic pumps |
| US2828760A (en) * | 1953-05-19 | 1958-04-01 | British Messier Ltd | Automatic cut-outs for hydraulic circuits |
| US2848009A (en) * | 1956-02-16 | 1958-08-19 | Gen Motors Corp | Unloading valve |
-
1961
- 1961-02-28 FR FR854172A patent/FR1290260A/en not_active Expired
-
1962
- 1962-01-22 BE BE612936A patent/BE612936A/en unknown
- 1962-01-25 ES ES0274038A patent/ES274038A1/en not_active Expired
- 1962-01-31 GB GB371962A patent/GB988780A/en not_active Expired
- 1962-02-05 US US17115362 patent/US3149639A/en not_active Expired - Lifetime
- 1962-02-26 LU LU41303D patent/LU41303A1/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| BE612936A (en) | 1962-05-16 |
| LU41303A1 (en) | 1962-04-26 |
| US3149639A (en) | 1964-09-22 |
| FR1290260A (en) | 1962-04-13 |
| ES274038A1 (en) | 1962-03-16 |
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