GB777060A - Improvements in or relating to variable displacement hydraulic pump control systems - Google Patents
Improvements in or relating to variable displacement hydraulic pump control systemsInfo
- Publication number
- GB777060A GB777060A GB23313/54A GB2331354A GB777060A GB 777060 A GB777060 A GB 777060A GB 23313/54 A GB23313/54 A GB 23313/54A GB 2331354 A GB2331354 A GB 2331354A GB 777060 A GB777060 A GB 777060A
- Authority
- GB
- United Kingdom
- Prior art keywords
- stem
- inlet
- outlet
- pressure
- valve
- 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
- 238000006073 displacement reaction Methods 0.000 title abstract 2
- 239000012530 fluid Substances 0.000 abstract 3
- 238000013016 damping Methods 0.000 abstract 1
- 238000007789 sealing Methods 0.000 abstract 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
777,060. Fluid-pressure servomotor control systems. UNITED AIRCRAFT CORPORATION. Aug. 11, 1954 [Aug. ,19, 1953], No. 23313/54. Class 135. A fluid pressure control device for a variable displacement hydraulic pump comprises a casing with inlet and outlet, a valve with a movable stem, two chambers connected by separate passages to the inlet, the stem being moved in one direction by inlet pressure in the chambers reaching a predetermined value, for connecting the inlet and outlet, means for moving the stem in the opposite direction when inlet pressure falls below that value, restricted communication between the chambers for damping the movement of the stem in the opposite direction and means for sealing off one passage during fall of inlet pressure. The casing has the inlet 34 connected to the pump outlet, the outlet 36 connected to a spring-loaded piston operating the pump stroke control and a drain 86. The valve 48 has a stem 58 and a land 48 both responsive to rise in pump outlet pressure above a predetermined value to move the valve to the left to connect the casing inlet and outlet, and a spring 66 urging the valve to the right to connect the casing outlet to drain, the land and stem being respectively open to pump outlet pressure via passages 46, 50, the latter containing a check valve 52. The system is for maintaining a predetermined pump output pressure irrespective of the output. As the valve moves to the right fluid trapped in chamber 56 between stem 58 and the closed check valve damps the movement, the fluid leaking away between the stem 40 and the bushing 42.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US777060XA | 1953-08-19 | 1953-08-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB777060A true GB777060A (en) | 1957-06-19 |
Family
ID=22139604
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23313/54A Expired GB777060A (en) | 1953-08-19 | 1954-08-11 | Improvements in or relating to variable displacement hydraulic pump control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB777060A (en) |
-
1954
- 1954-08-11 GB GB23313/54A patent/GB777060A/en not_active Expired
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