JPS5491801A - Pump ejection control circuit - Google Patents
Pump ejection control circuitInfo
- Publication number
- JPS5491801A JPS5491801A JP15775677A JP15775677A JPS5491801A JP S5491801 A JPS5491801 A JP S5491801A JP 15775677 A JP15775677 A JP 15775677A JP 15775677 A JP15775677 A JP 15775677A JP S5491801 A JPS5491801 A JP S5491801A
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- control valve
- port
- control valves
- pump
- 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.)
- Pending
Links
Landscapes
- Control Of Positive-Displacement Pumps (AREA)
Abstract
PURPOSE: To reduce power loss, heat generation and noise at the time when the actuator is stopped in a pump, by using a combination of circuits containing a circuit in which 3-port type pressure-control valves are inserted.
CONSTITUTION: When direction-control valve 30 is in the middle position, line 42 of pressure-control valve 22 is opened to the tank via passage 43. Pressure-control valve spring 40 is designed for a smaller load than those of the springs of two pressure-control valves 33 and 24. Consequently, pressure-control valve 22 is switched by the pressure of main line 20, and Port P' and Port A' are linked. For this reason, two pressure-control valves 33 and 24 assume the states as shown in the drawing due to the forces of their respective springs, and main line 20 and No. 2 yoke cylinder 26 are linked via pressure-control valve 22. As a result, the pump ejection pressure is controlled to a low pressure.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15775677A JPS5491801A (en) | 1977-12-29 | 1977-12-29 | Pump ejection control circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP15775677A JPS5491801A (en) | 1977-12-29 | 1977-12-29 | Pump ejection control circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5491801A true JPS5491801A (en) | 1979-07-20 |
Family
ID=15656643
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP15775677A Pending JPS5491801A (en) | 1977-12-29 | 1977-12-29 | Pump ejection control circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5491801A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5677675U (en) * | 1979-11-22 | 1981-06-24 |
-
1977
- 1977-12-29 JP JP15775677A patent/JPS5491801A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5677675U (en) * | 1979-11-22 | 1981-06-24 |
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