JPS61204002U - - Google Patents
Info
- Publication number
- JPS61204002U JPS61204002U JP7286586U JP7286586U JPS61204002U JP S61204002 U JPS61204002 U JP S61204002U JP 7286586 U JP7286586 U JP 7286586U JP 7286586 U JP7286586 U JP 7286586U JP S61204002 U JPS61204002 U JP S61204002U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pilot
- pressure
- throttle valve
- switching 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Fluid-Pressure Circuits (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Description
第1図はこの考案の一実施例の回路図、第2図
はアクチユエータの立ち上がり応答性を示すグラ
フ、第3図はこの考案の他の実施例の回路図、第
4図は従来例の回路図である。
1……可変ポンプ、2……ノーマルクローズド
形の切換弁、4……ノーマルオープン形の絞り弁
、5……パイロツト弁、5a……流量制御用圧力
弁、5b……圧力制御弁、20……パイロツトリ
リーフ弁、30……油圧シリンダ。
Fig. 1 is a circuit diagram of one embodiment of this invention, Fig. 2 is a graph showing the start-up response of the actuator, Fig. 3 is a circuit diagram of another embodiment of this invention, and Fig. 4 is a circuit of a conventional example. It is a diagram. DESCRIPTION OF SYMBOLS 1... Variable pump, 2... Normally closed type switching valve, 4... Normally open type throttle valve, 5... Pilot valve, 5a... Pressure valve for flow rate control, 5b... Pressure control valve, 20... ...Pilot relief valve, 30...Hydraulic cylinder.
Claims (1)
ポンプポート・ノーマルクローズド形の切換弁2
と可変ポンプ1との間のメインラインに、ノーマ
ルオープン形の絞り弁4を設置する一方、該絞り
弁4の前位の圧力と絞り弁4と切換弁2との間の
圧力とが夫々パイロツト室とバネ室に伝えられる
パイロツト弁5で上記可変ポンプ1の吐出量制御
部をメインラインとタンクに切換接続可能になし
て、上記絞り弁4を流れる流体のその前後の差圧
を一定に保持すると共に、上記切換弁2の作動と
同時に高圧または低圧を設定できるパイロツトリ
リーフ弁20を上記パイロツト弁5のバネ室に接
続して上記可変ポンプ1の吐出圧力を低圧または
高圧に選択できるように構成し、上記切換弁2の
ポンプポートを閉鎖したときには、上記パイロツ
トリリーフ弁20を低圧側に設定する一方、上記
切換弁2のポンプポートを開放したときには上記
パイロツトリリーフ弁20を高圧側に設定するよ
うにしたことを特徴とする流体制御装置。 Pump port normally closed type switching valve 2 that controls only the operating direction of the actuator 30
A normally open type throttle valve 4 is installed in the main line between the throttle valve 4 and the variable pump 1, and the pressure in front of the throttle valve 4 and the pressure between the throttle valve 4 and the switching valve 2 are controlled by the pilot valve, respectively. The discharge amount control section of the variable pump 1 can be switchably connected to the main line and the tank by the pilot valve 5 which is transmitted to the chamber and the spring chamber, and the differential pressure before and after the fluid flowing through the throttle valve 4 is maintained constant. At the same time, a pilot relief valve 20 that can set high or low pressure simultaneously with the operation of the switching valve 2 is connected to the spring chamber of the pilot valve 5, so that the discharge pressure of the variable pump 1 can be selected between low pressure and high pressure. When the pump port of the switching valve 2 is closed, the pilot relief valve 20 is set to the low pressure side, and when the pump port of the switching valve 2 is opened, the pilot relief valve 20 is set to the high pressure side. A fluid control device characterized by:
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986072865U JPH021521Y2 (en) | 1986-05-14 | 1986-05-14 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1986072865U JPH021521Y2 (en) | 1986-05-14 | 1986-05-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS61204002U true JPS61204002U (en) | 1986-12-22 |
JPH021521Y2 JPH021521Y2 (en) | 1990-01-16 |
Family
ID=30611679
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1986072865U Expired JPH021521Y2 (en) | 1986-05-14 | 1986-05-14 |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH021521Y2 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2892312A (en) * | 1958-01-27 | 1959-06-30 | Deere & Co | Demand compensated hydraulic system |
JPS4989202A (en) * | 1972-12-18 | 1974-08-26 | ||
JPS50111628A (en) * | 1974-02-13 | 1975-09-02 | ||
JPS5461192U (en) * | 1977-10-07 | 1979-04-27 |
-
1986
- 1986-05-14 JP JP1986072865U patent/JPH021521Y2/ja not_active Expired
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2892312A (en) * | 1958-01-27 | 1959-06-30 | Deere & Co | Demand compensated hydraulic system |
JPS4989202A (en) * | 1972-12-18 | 1974-08-26 | ||
US3856436A (en) * | 1972-12-18 | 1974-12-24 | Sperry Rand Corp | Power transmission |
JPS50111628A (en) * | 1974-02-13 | 1975-09-02 | ||
JPS5461192U (en) * | 1977-10-07 | 1979-04-27 |
Also Published As
Publication number | Publication date |
---|---|
JPH021521Y2 (en) | 1990-01-16 |
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