GB607127A - A new or improved hydraulic system for unloading large capacity pumps - Google Patents
A new or improved hydraulic system for unloading large capacity pumpsInfo
- Publication number
- GB607127A GB607127A GB1311645A GB1311645A GB607127A GB 607127 A GB607127 A GB 607127A GB 1311645 A GB1311645 A GB 1311645A GB 1311645 A GB1311645 A GB 1311645A GB 607127 A GB607127 A GB 607127A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- pump
- delivery
- pipe
- pressure
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B15/00—Details of, or accessories for, presses; Auxiliary measures in connection with pressing
- B30B15/16—Control arrangements for fluid-driven presses
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Details Of Reciprocating Pumps (AREA)
Abstract
607,127. Hydraulic presses; valves. TOWLER, J. M., and TOWLER, F. H. May 25, 1945, No. 13116. [Classes 69 (ii) and 135] [Also in Group XXVIII] In a hydraulic system for controlling the supply of liquid to a hydraulic press comprising a large capacity pump for supplying the main liquid for operating the press ram and a small capacity pump for maintaining constant pressure in the delivery main, there is provided an automatically operating control means having two valve portions, one of said portions controlling the delivery of the large capacity pump so that said delivery is diverted wholly to exhaust at a predetermined pressure in the delivery main, the other valve portion controlling the delivery of the small capacity pump whereby it is caused to maintain pressure on the press ram after the large capacity pump has been cut out, the valve portions both being subject to a common load so that the maximum pressure generated by the two pumps is controlled by a single adjustment. The system includes a large capacity pump A, Fig. 2, a small capacity pump B, Fig. 1, of the kind described in Specification 567,105, an amplifier unloading valve C, and a master control valve E. The pump B delivers liquid through a pipe 8, valve E, and pipe 11 into a space 5 in the valve C where it is joined by liquid delivered by pump A into a pipe 2, the delivery then being made through pipe 6 to the press. The valve C houses a plunger 14 and a helicallygrooved piston 13, the space above which is exhausted at a predetermined pressure through a pipe 48. At this pressure liquid delivered by the pump A raises the plunger and piston, thereby gaining access to an exhaust pipe 7. The right-hand portion of the valve E houses a valve plunger 30 operated by pressure liquid acting on the right-hand side of a piston 41, a relief valve 27, an exhaust outlet 28 and an outlet 25 for connection via pipe 12 to the unloading valve D of pump B, so that this portion of the valve E controls the delivery of pump B and allows it to maintain pressure on the press after the pump A has been cut out. The left-hand portion of valve E houses a valve plunger 46 which is moved by the plunger 30, both plungers being subject to an adjustable load imposed by a spring 40. Movement of the plunger 46 connects the pipe 48 to exhaust outlet 28 so that this portion of the valve controls the delivery of pump A to divert it wholly to exhaust at the predetermined pressure imposed by the spring 40. The amplifier unloading valve may be dispensed with, a non- return valve being introduced through which the pump A delivers into the main pressure main, said pump being unloaded directly by the left-hand portion of the valve E. Figs. 6 and 7 (not shown) illustrate a type of valve E, one portion of which controls the unloading of the large pump A, the other portion unloading directly the small capacity pump after the pump A has been unloaded, thus permitting the small pump to be of the non-sustained pressure type. The pump A may be unloaded through an amplifier unloading valve or directly through the control valve, in which case a non-return valve is fitted in the circuit. Specification 604,757 is referred to in the Provisional Specification.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1311645A GB607127A (en) | 1945-05-25 | 1945-05-25 | A new or improved hydraulic system for unloading large capacity pumps |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1311645A GB607127A (en) | 1945-05-25 | 1945-05-25 | A new or improved hydraulic system for unloading large capacity pumps |
Publications (1)
Publication Number | Publication Date |
---|---|
GB607127A true GB607127A (en) | 1948-08-26 |
Family
ID=10017107
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1311645A Expired GB607127A (en) | 1945-05-25 | 1945-05-25 | A new or improved hydraulic system for unloading large capacity pumps |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB607127A (en) |
-
1945
- 1945-05-25 GB GB1311645A patent/GB607127A/en not_active Expired
Similar Documents
Publication | Publication Date | Title |
---|---|---|
ES212937U (en) | Accumulator device for servofreno mechanism. (Machine-translation by Google Translate, not legally binding) | |
GB1077844A (en) | Hydraulic power units | |
GB1404691A (en) | Air operated hydraulic pump | |
GB994692A (en) | Improved positive displacement pump | |
GB607127A (en) | A new or improved hydraulic system for unloading large capacity pumps | |
GB1011019A (en) | Improvements in or relating to automatic regulating devices for a hydraulic swash-plate-type pump or motor | |
US2790305A (en) | Control valves for hydraulic presses | |
US2420554A (en) | Fluid pressure regulation and control apparatus | |
GB1147165A (en) | Hydraulic control apparatus | |
US2545246A (en) | Main cylinder release and pump bypass valve | |
GB1376559A (en) | Power braking systems for vehicles | |
US2957419A (en) | Control valves for two-stage pumps, especially in hydraulic presses | |
GB568859A (en) | Improvements in and relating to pilot-operated unloading valves for hydraulic pumps | |
GB1072378A (en) | Improvements in or relating to hydraulically actuated flexible chamber pumps | |
GB952203A (en) | Improvements in or relating to reciprocating pumps | |
GB610030A (en) | Improvements in hydraulic circuits for metal working presses | |
GB611628A (en) | Improvements relating to automatic unloading valves for hydraulic pressure supply systems | |
GB1276898A (en) | Air compressor system | |
ES340803A1 (en) | Hydraulic booster apparatus | |
GB1114259A (en) | Apparatus for and a method of compressing a fluid | |
US2472529A (en) | Hydraulic pump | |
GB1212609A (en) | Improvements in or relating to twin variable-delivery pump units | |
ES361480A1 (en) | Pump cylinder for hydraulic brakes. (Machine-translation by Google Translate, not legally binding) | |
GB635838A (en) | Improvements in reciprocating pumps for hydraulic rams | |
GB1445388A (en) | Plunger or piston pump having plungers or pistons which are opposed-acting sampling arrangements |