JPS5690105A - Controlling valve for farm working machinery of agricultural tractor - Google Patents
Controlling valve for farm working machinery of agricultural tractorInfo
- Publication number
- JPS5690105A JPS5690105A JP16906979A JP16906979A JPS5690105A JP S5690105 A JPS5690105 A JP S5690105A JP 16906979 A JP16906979 A JP 16906979A JP 16906979 A JP16906979 A JP 16906979A JP S5690105 A JPS5690105 A JP S5690105A
- Authority
- JP
- Japan
- Prior art keywords
- spool
- changing over
- main passage
- agricultural tractor
- 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.)
- Pending
Links
Landscapes
- Servomotors (AREA)
- Fluid-Pressure Circuits (AREA)
- Lifting Devices For Agricultural Implements (AREA)
Abstract
PURPOSE: To reduce leakage from the cylinder port of a farm working machinery of an agricultural tractor and consequently the operating force needed for changing over its spool by allowing a main passage to communicate with the pressure chamber and leading the pressure generated in the main passage to the rear of the pilot piston by changing over the spool.
CONSTITUTION: An unloading valve 17 is provided with an orifice 22 to allow a main passage 3 to communicate with a pressure chamber 18, which is opened or closed on the side of a tank T by changing over a spool S. Between main passages 4 and 5 the first check valve 23 is provided and between a main passage 6 and a valve hole 25 the second check valve 28 is provided. In addition, into the valve hole 25 a pilot piston 30 is movably inserted so that a high pressure generated in the main passage 3 is led to its back chamber 32 by changing over the spool S. Because the oil returning from a cylinder C is cut off by the check valves 23 and 28 leakage decreases, so that the operating force needed for an operating lever 57 can be reduced to what needed just for changing over the spool S.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16906979A JPS5690105A (en) | 1979-12-24 | 1979-12-24 | Controlling valve for farm working machinery of agricultural tractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16906979A JPS5690105A (en) | 1979-12-24 | 1979-12-24 | Controlling valve for farm working machinery of agricultural tractor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5690105A true JPS5690105A (en) | 1981-07-22 |
Family
ID=15879746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16906979A Pending JPS5690105A (en) | 1979-12-24 | 1979-12-24 | Controlling valve for farm working machinery of agricultural tractor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5690105A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9357689B2 (en) | 2013-11-11 | 2016-06-07 | Cnh Industrial America Llc | Pressure control system and method for an agricultural planter |
| US9867427B2 (en) | 2013-10-10 | 2018-01-16 | Asics Corporation | Shoe sole |
| WO2019027394A3 (en) * | 2017-06-15 | 2019-03-28 | Hema Endustri Anonim Sirketi | A control valve for hydraulic lifters and production method of said control valve |
| CN110753489A (en) * | 2017-06-15 | 2020-02-04 | 土耳其赫马公司 | Control valve for hydraulic lifter |
-
1979
- 1979-12-24 JP JP16906979A patent/JPS5690105A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9867427B2 (en) | 2013-10-10 | 2018-01-16 | Asics Corporation | Shoe sole |
| US9357689B2 (en) | 2013-11-11 | 2016-06-07 | Cnh Industrial America Llc | Pressure control system and method for an agricultural planter |
| US9769977B2 (en) | 2013-11-11 | 2017-09-26 | Cnh Industrial America Llc | Pressure control system and method for an agricultural planter |
| US9788476B2 (en) | 2013-11-11 | 2017-10-17 | Cnh Industrial America Llc | Pressure control system and method for an agricultural planter |
| WO2019027394A3 (en) * | 2017-06-15 | 2019-03-28 | Hema Endustri Anonim Sirketi | A control valve for hydraulic lifters and production method of said control valve |
| CN110753489A (en) * | 2017-06-15 | 2020-02-04 | 土耳其赫马公司 | Control valve for hydraulic lifter |
| EP3638935A4 (en) * | 2017-06-15 | 2021-08-04 | Hema Endüstri Anonim Sirketi | A control valve for hydraulic lifters |
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