JPS6412904U - - Google Patents
Info
- Publication number
- JPS6412904U JPS6412904U JP9447088U JP9447088U JPS6412904U JP S6412904 U JPS6412904 U JP S6412904U JP 9447088 U JP9447088 U JP 9447088U JP 9447088 U JP9447088 U JP 9447088U JP S6412904 U JPS6412904 U JP S6412904U
- Authority
- JP
- Japan
- Prior art keywords
- valve
- pressure
- port
- throttle valve
- variable 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Fluid-Pressure Circuits (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 an embodiment of this invention, FIG. 2 is a graph showing the start-up response of the actuator, and FIG. 3 is a circuit diagram of a conventional example. 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、
絞り弁４の前位に接続された１次ポートｌとタン
クに接続された１次ポートｍとに２次ポートｎが
切換接続される流量制御用圧力弁５ａと、パイロ
ツト室が上記絞り弁４の前位に制御される一方、
バネ室が絞り５５を介して上記絞り弁４の前位に
接続され、上記流量制御用圧力弁５ａの２次ポー
トｎに接続された１次ポートｍと上記絞り弁４の
前位に接続された１次ポートｌとを上記可変ポン
プ１の吐出量制御部１３が接続された２次ポート
ｎに切換接続する圧力制御弁５ｂとを備え、上記
流量制御用圧力弁５ａと圧力制御弁５ｂとで可変
ポンプ１の吐出量制御部１３をメインライン３と
タンクに切換接続可能になし、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を上記圧力制御弁５ｂ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 throttle valve 4 is installed in the main line between the throttle valve 4 and the variable pump 1, while 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. It is conveyed to the chamber and spring chamber,
A pressure valve 5a for flow rate control has a secondary port n switched between a primary port l connected to the front side of the throttle valve 4 and a primary port m connected to the tank, and a pilot chamber is connected to the throttle valve 4. while being controlled in front of
A spring chamber is connected to the front of the throttle valve 4 via the throttle 55, and is connected to the front of the throttle valve 4 to a primary port m connected to the secondary port n of the flow rate control pressure valve 5a. and a pressure control valve 5b that switches and connects the primary port l of the variable pump 1 to the secondary port n to which the discharge rate control unit 13 of the variable pump 1 is connected, and the flow rate control pressure valve 5a and the pressure control valve 5b. The discharge amount control unit 13 of the variable pump 1 can be connected to the main line 3 and the tank in a switchable manner, and a pilot relief valve 20 that can set high or low pressure at the same time as the switching valve 2 is operated is connected to the spring chamber of the pressure control valve 5b. is connected to the variable pump 1 so that the discharge pressure of the variable pump 1 can be selected between low pressure and high pressure, and when the pump port of the switching valve 2 is closed, the pilot relief valve 20 is set to the low pressure side, and
A fluid control device characterized in that the pilot relief valve 20 is set to the high pressure side when the pump port of the switching valve 2 is opened.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9447088U JPH0342245Y2 (en) | 1988-07-15 | 1988-07-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9447088U JPH0342245Y2 (en) | 1988-07-15 | 1988-07-15 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6412904U true JPS6412904U (en) | 1989-01-24 |
| JPH0342245Y2 JPH0342245Y2 (en) | 1991-09-04 |
Family
ID=31318997
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9447088U Expired JPH0342245Y2 (en) | 1988-07-15 | 1988-07-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0342245Y2 (en) |
-
1988
- 1988-07-15 JP JP9447088U patent/JPH0342245Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0342245Y2 (en) | 1991-09-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR960023845A (en) | Hydraulic circuit using anti-tol valve of forklift | |
| JPH01150202U (en) | ||
| KR830008060A (en) | Hydraulic control system | |
| EP0416130A4 (en) | Hydraulic valve capable of pressure compensation | |
| JPS6412904U (en) | ||
| JPS61204002U (en) | ||
| JPS5939203Y2 (en) | fluid control device | |
| JPH0643522Y2 (en) | Variable pump flow controller | |
| JPH0187302U (en) | ||
| JPS5821921Y2 (en) | remote control device | |
| JPS6126691Y2 (en) | ||
| JPH0730962Y2 (en) | Actuator separation position control device | |
| JPH059522Y2 (en) | ||
| JPH0341135Y2 (en) | ||
| JPH024241Y2 (en) | ||
| JPS62801U (en) | ||
| JPH0377078U (en) | ||
| JP3028774U (en) | Hydraulic circuit for proportional electromagnetic pressure control | |
| JPS6189059U (en) | ||
| JPS6123681Y2 (en) | ||
| JPH0291201U (en) | ||
| JPH0417522U (en) | ||
| JPS62132275U (en) | ||
| JPS6152346B2 (en) | ||
| JP2652791B2 (en) | Flow control device |