JPH01100902U - - Google Patents
Info
- Publication number
- JPH01100902U JPH01100902U JP12201987U JP12201987U JPH01100902U JP H01100902 U JPH01100902 U JP H01100902U JP 12201987 U JP12201987 U JP 12201987U JP 12201987 U JP12201987 U JP 12201987U JP H01100902 U JPH01100902 U JP H01100902U
- Authority
- JP
- Japan
- Prior art keywords
- check valve
- hydraulic
- valve
- control section
- construction machinery
- 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
- 238000010276 construction Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Operation Control Of Excavators (AREA)
- Control And Safety Of Cranes (AREA)
- Fluid-Pressure Circuits (AREA)
Description
第１図は、本考案の実施例の断面を含む回路図
、第２図は、従来技術の回路図。
１……油圧ポンプ、２……タンク、３……方向
切換弁、４……油圧シリンダ、４ａ，４ｂ……油
圧室、５，１０……カウンタバランス弁、１１…
…制御部、１２……逆止弁、１３……手動操作部
。
FIG. 1 is a circuit diagram including a cross section of an embodiment of the present invention, and FIG. 2 is a circuit diagram of a prior art. DESCRIPTION OF SYMBOLS 1... Hydraulic pump, 2... Tank, 3... Directional switching valve, 4... Hydraulic cylinder, 4a, 4b... Hydraulic chamber, 5, 10... Counter balance valve, 11...
...Control section, 12...Check valve, 13...Manual operation section.
Claims (1)
、油圧シリンダの一方の圧力室を制御部と逆止弁
を有するカウンタバランス弁を介して接続すると
共に、油圧シリンダの他方の油圧室を直接接続し
た建設機械の油圧回路において、前記カウンタバ
ランス弁の制御部と逆止弁を同一軸心上で、かつ
、逆止弁の内側に制御部を配置し、前記逆止弁を
強制的に開放させる手動操作部を有することを特
徴とする、建設機械の油圧回路。 One pressure chamber of the hydraulic cylinder is connected via a counterbalance valve having a control unit and a check valve, and the other hydraulic chamber of the hydraulic cylinder is directly connected to the directional switching valve that connects the hydraulic pump and the tank. In the hydraulic circuit of construction machinery, the control section of the counterbalance valve and the check valve are arranged on the same axis, and the control section is arranged inside the check valve, and the control section is manually operated to forcibly open the check valve. A hydraulic circuit for construction machinery, characterized by having an operating section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12201987U JPH01100902U (en) | 1987-08-07 | 1987-08-07 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12201987U JPH01100902U (en) | 1987-08-07 | 1987-08-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01100902U true JPH01100902U (en) | 1989-07-06 |
Family
ID=31369559
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12201987U Pending JPH01100902U (en) | 1987-08-07 | 1987-08-07 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01100902U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58121370A (en) * | 1982-01-09 | 1983-07-19 | Nippon Air Brake Co Ltd | Counterbalance valve |
| JPS5925753B2 (en) * | 1981-08-21 | 1984-06-20 | 工業技術院長 | How to bond Sialon |
| JPS5925754B2 (en) * | 1981-12-02 | 1984-06-20 | 工業技術院長 | Adhesive for ceramics and its adhesion method |
-
1987
- 1987-08-07 JP JP12201987U patent/JPH01100902U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5925753B2 (en) * | 1981-08-21 | 1984-06-20 | 工業技術院長 | How to bond Sialon |
| JPS5925754B2 (en) * | 1981-12-02 | 1984-06-20 | 工業技術院長 | Adhesive for ceramics and its adhesion method |
| JPS58121370A (en) * | 1982-01-09 | 1983-07-19 | Nippon Air Brake Co Ltd | Counterbalance valve |