JPH02107872A - Oil path switching device - Google Patents
Oil path switching deviceInfo
- Publication number
- JPH02107872A JPH02107872A JP26065688A JP26065688A JPH02107872A JP H02107872 A JPH02107872 A JP H02107872A JP 26065688 A JP26065688 A JP 26065688A JP 26065688 A JP26065688 A JP 26065688A JP H02107872 A JPH02107872 A JP H02107872A
- Authority
- JP
- Japan
- Prior art keywords
- oil
- pressure
- hydraulic
- boat
- front loader
- 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
- 239000003921 oil Substances 0.000 claims description 53
- 239000010729 system oil Substances 0.000 claims description 15
- 230000009977 dual effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
Landscapes
- Multiple-Way Valves (AREA)
- Fluid-Pressure Circuits (AREA)
- Operation Control Of Excavators (AREA)
Abstract
Description
【発明の詳細な説明】
ＬＩＬ夏剋ユＵ
本発明は、トラクタ本体より外部の油圧シリンダ等のア
クチュエータに圧油を供給するための油路切換装置に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an oil passage switching device for supplying pressure oil from a tractor main body to an actuator such as an external hydraulic cylinder.
１」ＬＪＬ術
前後に作業機を備えたトラクタにおいて、１個の油圧ポ
ンプでもって前後の作業機を同時に動作させるために、
油圧ポンプからフロントローダ油圧回路を介してリヤ作
業機油圧回路に直列に油通路を接続させることがある。1. In a tractor equipped with work equipment before and after LJL surgery, in order to operate the front and rear work equipment simultaneously with one hydraulic pump,
An oil passage may be connected in series from the hydraulic pump to the rear work machine hydraulic circuit via the front loader hydraulic circuit.
ところが油圧ポンプから最も離れたリヤ作業機に開穴的
に圧油を供給してりＡ７作業機油圧回路をパルス駆動す
る際に、その中間にフロン１一〇一ダ油圧回路が存在す
ると、このフロントローダ油圧回路がアキュムレータの
働きをして、脈動する高圧を吸収してしまい、所用の目
的を充分に達成ずることができない。However, when supplying pressurized oil to the rear working machine that is farthest from the hydraulic pump and pulse-driving the A7 working machine hydraulic circuit, if there is a Freon 1101 hydraulic circuit in the middle, this The front loader hydraulic circuit acts as an accumulator and absorbs the pulsating high pressure, making it unable to fully accomplish its intended purpose.
このような要求に応えるために、従来では、第１図ない
し第２図に図示されるような油圧装置があった。In order to meet such demands, there have conventionally been hydraulic systems as shown in FIGS. 1 and 2.
第１図ないし第２図に図示の油圧装置においては、油圧
ポンプ０１からフロン１一〇ーダの油圧回路０２へ通ず
る油路０３と、フロントローダ油圧回路０２からリヤ作
業機の油圧回路０４へ通ずる油路０５とに切換弁０６が
介装されていた。In the hydraulic system shown in Figs. 1 and 2, an oil passage 03 leads from the hydraulic pump 01 to the hydraulic circuit 02 of the Freon 110der, and from the front loader hydraulic circuit 02 to the hydraulic circuit 04 of the rear working machine. A switching valve 06 was interposed in the communicating oil passage 05.
この油圧装置で、すＶ作業機のみを動作させる場合には
、第１図に図示する如く油圧ポンプ０１へ通ずる切換弁
０６のボート０７が、リヤ作業機油圧回路０４へ通ずる
切換弁６のボート０８に接続されるように、切換弁０６
を操作し、またフロントローダおよびリヤ作業機を動作
させる場合には、第２図に図示する如く、ボート０７が
フロントローダ油圧回路０２の入口ボート０９に接続さ
れるとともに、ボート０８がフロントローダ油圧回路０
２の出口ボート０１０に接続されるように、切換弁０６
を操作すればよかった。When operating only the V working machine with this hydraulic system, as shown in FIG. 08, the switching valve 06
When operating the front loader and rear work equipment, as shown in FIG. 2, the boat 07 is connected to the inlet boat 09 of the front loader hydraulic circuit 02, and the boat 08 is circuit 0
The switching valve 06 is connected to the outlet boat 010 of 2.
I should have operated the .
゛し と る・
ところが、フロントローダを上方に持上げた状態で第１
図に図示するように切換弁を操作すると、フロントロー
ダ油圧回路０２にてフロントローダの自重に対抗してフ
ロン１−ローダを支持するための高油圧が生じ、ボート
０９． ０１０にこの高油圧が作用して、切換弁０６に
大きな摩擦力が発生し、第１図に図示の状態から第２図
に図示の状態に切換弁０６を切換えるには大きな操作力
を必要とした。However, with the front loader lifted upwards, the
When the switching valve is operated as shown in the figure, high hydraulic pressure is generated in the front loader hydraulic circuit 02 to support the front loader against the dead weight of the front loader, and the boat 09. This high oil pressure acts on the switching valve 010, generating a large frictional force on the switching valve 06, and a large operating force is required to switch the switching valve 06 from the state shown in FIG. 1 to the state shown in FIG. did.
だ の および
本発明は、このような難点を克服した油路切換装置の改
良に係り、油圧ポンプから吐出された圧油を２系統の油
圧回路に直列に供給しまたは該２系統の一方の油圧回路
への圧油供給を遮断して他方の油圧回路のみ圧油を供給
する２系統油路切換弁を備え、前記一方の油圧回路への
圧油供給遮断状態にて該一方の油圧回路に大きな油圧が
発生する油圧装置において、前記一方の油圧回路より他
方の油圧回路へ所定圧以上の圧油を流す逆止弁が設けら
れたことを特徴とするものである。The present invention relates to an improvement of an oil passage switching device that overcomes these difficulties, and is capable of supplying pressure oil discharged from a hydraulic pump to two hydraulic circuits in series or to one of the two hydraulic circuits. It is equipped with a two-system oil passage switching valve that cuts off the pressure oil supply to the circuit and supplies pressure oil only to the other hydraulic circuit, and when the pressure oil supply to the one hydraulic circuit is cut off, there is a large The hydraulic system that generates hydraulic pressure is characterized in that it is provided with a check valve that allows pressure oil at a predetermined pressure or higher to flow from the one hydraulic circuit to the other hydraulic circuit.
本発明では、前記したように構成されているため、前記
一方の油圧回路への圧油供給遮断状態にＪ３いて、該一
方の油圧回路の７クヂエータに大きなｎ荷が加わって該
油圧回路に大きな油圧が発生しようとした場合には、前
記逆止弁が動作して、該一方の油圧回路より他方の油圧
回路へ圧油が流れて、該一方の油圧回路に大きな油圧が
発生することが未然に阻止される。In the present invention, since it is configured as described above, when the pressure oil supply to the one hydraulic circuit is cut off, a large n load is applied to the 7 quatifier of the one hydraulic circuit, and a large load is applied to the hydraulic circuit. When hydraulic pressure is about to be generated, the check valve operates, pressure oil flows from one hydraulic circuit to the other hydraulic circuit, and a large hydraulic pressure is generated in the one hydraulic circuit. be prevented.
！−」Ｌ−劃
以下第３図ないし第８図に図示された本発明の一実施例
について説明する。! An embodiment of the present invention illustrated in FIGS. 3 to 8 will be described below.
トラクタ１の前方には、フロントローダ２が配設され、
このフロントローダ２はブームシリンダ４（第５図参照
）により上下へ起伏し、またフロントローダ２のパケッ
ト３はパケットシリンダ５によって上下へ昇降しうるよ
うになっている。A front loader 2 is arranged in front of the tractor 1,
The front loader 2 can be raised and lowered by a boom cylinder 4 (see FIG. 5), and the packet 3 of the front loader 2 can be raised and lowered by a packet cylinder 5.
またトラクタ１の運転席６の前方右側には、フロントロ
ーダ制御レバー７によって制御されるフロントローダ制
御弁８が配置されている。Further, a front loader control valve 8 controlled by a front loader control lever 7 is arranged on the front right side of the driver's seat 6 of the tractor 1 .
さらに運転席６の直下に油圧ポンプ９が設けられ、油圧
ポンプ９の吐出口に圧油パイプ１０の一端が接続される
とともに、圧油パイプ１ｏの他端は２系統油路切換弁１
１の第１ボート１２に接続されている。Further, a hydraulic pump 9 is provided directly below the driver's seat 6, one end of a pressure oil pipe 10 is connected to the discharge port of the hydraulic pump 9, and the other end of the pressure oil pipe 1o is connected to a two-system oil passage switching valve 1.
1 is connected to the first boat 12 of No. 1.
さらにまた２系統油路切換弁１１の第２ボート１３はフ
ロントオイル送りパイプ１８を介してフロントローダ制
御弁８の入口に接続され、フロントローダ制御弁８の戻
り口はフロントオイル戻りパイプ１９を介して２系統油
路切換弁１１の第３ボート１４に接続されている。Furthermore, the second boat 13 of the dual oil passage switching valve 11 is connected to the inlet of the front loader control valve 8 via the front oil feed pipe 18, and the return port of the front loader control valve 8 is connected via the front oil return pipe 19. and is connected to the third boat 14 of the two-system oil passage switching valve 11.
しかも２系統油路切換弁１１の第４ボート１５はリアシ
リンダ２０およびリフトシリンダ（図示されず）に通ず
るリヤ油圧回路２６に接続され、２系統油路切換弁１１
は、弁本体１６に取付けられた切換レバー１７の操作に
より、第７図または第８図に図示される如く切換えられ
るようになっている。Moreover, the fourth boat 15 of the two-system oil passage switching valve 11 is connected to a rear hydraulic circuit 26 that communicates with the rear cylinder 20 and the lift cylinder (not shown).
can be switched as shown in FIG. 7 or 8 by operating a switching lever 17 attached to the valve body 16.
また２系統油路切換弁１５の弁本体１６には、第８図の
如く第１ボート１２．第２ボート１３を連通ずる連通路
２１と、第３ボート１４．第４ボート１５を連通ずる連
通路２２とが形成されるとともに、この連通路２１．連
通路２２に対して直角に弁本体１６を旋回操作した状態
にて、第７図の如く第１ボート１２．第４ボート１５を
短絡する知略路２３と、第２ボート１３゜第３ボート１
４を短絡する短絡路２４とが形成され、短絡路２３．短
絡路２４に逆止弁２５が介装されており、短絡路２４内
の圧力が所定の高圧値を越えた場合に、逆止弁２５が開
放されて、短絡路２４から短絡路２３に圧油が流れるよ
うになっている。Further, the valve body 16 of the two-system oil passage switching valve 15 has a first boat 12. A communication path 21 communicating the second boat 13 and a third boat 14 . A communication path 22 is formed which communicates the fourth boat 15, and this communication path 21. With the valve body 16 pivoted at right angles to the communication path 22, the first boat 12. Shiryakuro 23 that short-circuits the 4th boat 15, 2nd boat 13° 3rd boat 1
A short-circuit path 24 is formed to short-circuit the short-circuit paths 23 . A check valve 25 is interposed in the short circuit path 24, and when the pressure in the short circuit path 24 exceeds a predetermined high pressure value, the check valve 25 is opened and pressure is transferred from the short circuit path 24 to the short circuit path 23. Oil is now flowing.
第３図ないし第８図に図示の実施例は前記したように構
成されているので、トラクタ１における図示されないエ
ンジンを始動すると、油圧ポンプ９が稼動状態となって
圧油が発生する。Since the embodiment shown in FIGS. 3 to 8 is configured as described above, when the engine (not shown) of the tractor 1 is started, the hydraulic pump 9 is put into operation and pressure oil is generated.
また切換レバー１７を操作して第８図に図示するように
２系統油路切換弁１１を切換え、連通路２１゜連通路２
２でもって、第１ボート１２−第２ボート１３゜第３ボ
ート１４−第４ボート１５をそれぞれ連通状態にすると
、油圧ポンプ９で発生した圧油は圧油パイプ１０を介し
て２系統油路切換弁１１に送られるとともに、２系統油
路切換弁１１の第１ボート１２．第２ボート１３．フロ
ントオイル送りバイブ１８を介してフロントローダ制御
弁８に送られ、フロントローダ２が動作可能となる。そ
してフロントローダｆ、ＩＩ御弁８からの戻り油は、フ
ロントオイル戻りバイブ１９，２系統油路切換弁１１の
第３ボート１４．第４ボート１５を介してリヤ制御回路
２６に送られ、リヤ作業機のリアシリンダ２０および図
示されないリフトシリンダが動作可能となる。In addition, the switching lever 17 is operated to switch the two-system oil passage switching valve 11 as shown in FIG.
2, when the first boat 12 - the second boat 13 and the third boat 14 - the fourth boat 15 are brought into communication with each other, the pressure oil generated by the hydraulic pump 9 is transferred to the two oil lines via the pressure oil pipe 10. It is sent to the switching valve 11, and the first boat 12. 2nd boat 13. The oil is sent to the front loader control valve 8 via the front oil sending vibe 18, and the front loader 2 becomes operable. The return oil from the front loader f, II control valve 8 is transferred to the front oil return vibrator 19, the third boat 14 of the two-system oil passage switching valve 11. The signal is sent to the rear control circuit 26 via the fourth boat 15, and the rear cylinder 20 of the rear work machine and the lift cylinder (not shown) are enabled to operate.
次に切換レバー１１を操作して、第７図に図示するよう
に、２系統油路切換弁１１を切換え、第１ボート１２−
第２ボート１３および第３ボート１４−第４ボート１５
の連通をそれぞれ遮断し、第１ボート１２−第４ボート
１５を短絡状態にすると、フロントローダ制御弁８への
圧油の供給がＩｊＩＩｉされ、油圧ポンプ９で発生した
圧油は、圧油バイブ１０．２系統油路切換弁１１の第１
ボート１２．第４ボート１５を介してリヤ制御回路２６
に送られ、フロントローダ２は停止状態のまま、リヤ作
業機のり）７シリンダ２０および図示されないす７１〜
ロツドシリンダが動作可能となる。Next, operate the switching lever 11 to switch the two-system oil passage switching valve 11 as shown in FIG.
2nd boat 13 and 3rd boat 14 - 4th boat 15
When the first boat 12 to the fourth boat 15 are short-circuited by cutting off communication with each other, the supply of pressure oil to the front loader control valve 8 is IjIIi, and the pressure oil generated by the hydraulic pump 9 is transferred to the pressure oil vibrator. 10. The first of the two-system oil passage switching valve 11
Boat 12. Rear control circuit 26 via the fourth boat 15
The front loader 2 remains stopped, and the rear working machine cylinders 20 and 71 to 71 (not shown) are sent to
The rod cylinder becomes operational.
第８図に図示のようにフロントオイル２のブームシリン
ダ４に圧油を供給してパケット３を持上げた状態におい
て、第８図に図示された２系統油路切換弁１１の設定状
態から第７図に図示された設定状態に切換えた場合、フ
ロントログ−ブームシリンダ４内の油圧が高圧となって
、フロントオイル送りバイ１１８．フロントオイル戻り
バイブ１９および２系統油路切換弁１１の第２ボート１
３．第３ボート１４内の圧油の圧力も１胃するが、その
圧力が逆止弁２５の設定値よりも上昇すると、逆止弁２
５が開放して短絡路２４から短絡路２３に圧油が流れ、
短絡路２４内の圧力が一定の設定値以上にならないので
、弁本体１６とそのケーシング間の摩擦力が増大するこ
とがなく、弁本体１６を旋回させるに必要゛な操作力が
左程大きくならず、２系統油路切換弁１１の操作が軽快
となる。In a state where pressure oil is supplied to the boom cylinder 4 of the front oil 2 and the packet 3 is lifted as shown in FIG. When the setting is changed to the one shown in the figure, the oil pressure in the front log-boom cylinder 4 becomes high and the front oil feed by 118. Second boat 1 of front oil return vibe 19 and dual oil passage switching valve 11
3. The pressure of the pressure oil in the third boat 14 also decreases, but when that pressure rises above the set value of the check valve 25, the check valve 25
5 is opened and pressure oil flows from the short circuit path 24 to the short circuit path 23,
Since the pressure in the short-circuit path 24 does not exceed a certain set value, the frictional force between the valve body 16 and its casing does not increase, and the operating force required to rotate the valve body 16 is as large as the left. First, the operation of the two-system oil passage switching valve 11 becomes easier.
第３図ないし第８図に図示の実施例では、逆止弁２５を
２系統油路切換弁１１の弁本体１６に設けたが、第９図
に図示するように２系統油路切換弁１１より外部に逆止
弁２５を設けてもよく、該実施例は第３図ないし第８図
に図示の実施例と同様な作用効果を奏しつる。In the embodiment shown in FIGS. 3 to 8, the check valve 25 is provided in the valve body 16 of the two-system oil passage switching valve 11, but as shown in FIG. A check valve 25 may be provided more externally, and this embodiment provides the same effects as the embodiments shown in FIGS. 3 to 8.
ｌ団立１浬
このように本発明においては、一方の油圧経路のアクチ
エータに大きな負荷が加わって活油圧回路に大きな油圧
が発生しようとしても、前記逆止弁の動作でもって、該
一方の油圧経路における大油圧発生を未然に閉止できる
ため、前記２系統油路切換弁を著しく軽快に操作するこ
とができる。As described above, in the present invention, even if a large load is applied to the actuator of one hydraulic path and a large hydraulic pressure is generated in the active hydraulic circuit, the operation of the check valve prevents the hydraulic pressure of the one hydraulic path from being generated. Since generation of large oil pressure in the passage can be prevented, the two-system oil passage switching valve can be operated extremely easily.
第１図および第２図は従来の油路切換装置の要部縦断面
図で、第１はｔＲ１ｉ状態を、第２図は連通状態をそれ
ぞれ示しており、第３図は本発明に係る油路切換装置の
一実１例を備えたトラクタの平面図、第４図はその要部
側面図、第５図は第３図の側面図、第６図は２系統油路
切換弁１１の分解斜視図、第７図は要部拡大横断平面図
、第８図ｔは他の切換状態の横断平面図、第９図は他の
実施例の要部断面図である。
１・・・トラクタ、２・・・フロントローダ、３・・・
パケット、４・・・ブームシリンダ、５・・・パケット
シリンダ、６・・・運転席、７・・・フロントローダ制
御レバー８・・・フロントローダ制御弁、９・・・油圧
ポンプ、１０・・・圧油バイブ、１１・・・２系統油路
切換弁、１２・・・第１ボート、１３・・・第２ポート
、１４・・・第３ボート、１５・・・第４ボート、１６
・・・弁本体、１７・・・切換レバー、１８・・・フロ
ンＩ−Ａイル送りバイブ、１９・・・フロント戻りバイ
ブ、２０・・・リアシリンダ、２１．２２・・・連通路
、２３゜２４・・・短絡路、２５・・・逆止弁。
第６図
第９図1 and 2 are longitudinal sectional views of main parts of a conventional oil passage switching device, the first one showing the tR1i state, the second one showing the communicating state, and the third one showing the oil passage switching device according to the present invention. A plan view of a tractor equipped with an example of a road switching device, FIG. 4 is a side view of its essential parts, FIG. 5 is a side view of FIG. 3, and FIG. FIG. 7 is an enlarged cross-sectional plan view of a main part, FIG. 8 is a cross-sectional plan view of another switching state, and FIG. 9 is a cross-sectional view of a main part of another embodiment. 1...Tractor, 2...Front loader, 3...
Packet, 4...Boom cylinder, 5...Packet cylinder, 6...Driver's seat, 7...Front loader control lever 8...Front loader control valve, 9...Hydraulic pump, 10...・Pressure oil vibrator, 11...2-system oil passage switching valve, 12...1st boat, 13...2nd port, 14...3rd boat, 15...4th boat, 16
...Valve body, 17...Switching lever, 18...Freon I-A oil sending vibe, 19...Front return vibe, 20...Rear cylinder, 21.22...Communication path, 23゜24...Short circuit, 25...Check valve. Figure 6 Figure 9
Claims (1)
に直列に供給し、または該２系統の一方の油圧回路への
圧油供給を遮断して他方の油圧回路のみ圧油を供給する
２系統油路切換弁を備え、前記一方の油圧回路への圧油
供給遮断状態にて該一方の油圧回路に大きな油圧が発生
する油圧装置において、前記一方の油圧回路より他方の
油圧回路へ所定圧以上の圧油を流す逆止弁が設けられた
ことを特徴とする油路切換装置。 ２）前記逆止弁は前記２系統油路切換弁に介装されたこ
とを特徴とする前記特許請求の範囲第１項記載の油路切
換装置。[Claims] 1) Pressure oil discharged from a hydraulic pump is supplied to two hydraulic circuits in series, or the pressure oil supply to one of the two hydraulic circuits is cut off and the pressure oil is supplied to the other hydraulic circuit. In a hydraulic system that is equipped with a two-system oil passage switching valve that supplies only pressure oil, and in which a large hydraulic pressure is generated in the one hydraulic circuit when the pressure oil supply to the one hydraulic circuit is cut off, An oil path switching device characterized by being provided with a check valve that allows pressure oil at a predetermined pressure or higher to flow into the other hydraulic circuit. 2) The oil passage switching device according to claim 1, wherein the check valve is interposed in the two-system oil passage switching valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26065688A JPH02107872A (en) | 1988-10-18 | 1988-10-18 | Oil path switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26065688A JPH02107872A (en) | 1988-10-18 | 1988-10-18 | Oil path switching device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02107872A true JPH02107872A (en) | 1990-04-19 |
| JPH0550632B2 JPH0550632B2 (en) | 1993-07-29 |
Family
ID=17350949
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26065688A Granted JPH02107872A (en) | 1988-10-18 | 1988-10-18 | Oil path switching device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02107872A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011103050A1 (en) * | 2010-02-16 | 2011-08-25 | Access Business Group International Llc | Valve system |
| US8443825B2 (en) | 2008-11-10 | 2013-05-21 | Access Business Group International Llc | Faucet valve system |
| KR101437126B1 (en) * | 2012-11-20 | 2014-09-02 | 한국기계연구원 | Proportional Control Valve |
| KR101448821B1 (en) * | 2013-02-01 | 2014-10-13 | 한국기계연구원 | Method and apparatus for controlling proportional control valve |
| KR101486492B1 (en) * | 2012-10-04 | 2015-01-27 | 한국기계연구원 | Proportional control valve |
| CN106764376A (en) * | 2017-01-19 | 2017-05-31 | 徐工集团凯宫重工南京有限公司 | A kind of two-wire lubricates automatic diverter valve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7282863B1 (en) * | 2021-12-06 | 2023-05-29 | 櫻護謨株式会社 | switching mechanism and vehicle |
-
1988
- 1988-10-18 JP JP26065688A patent/JPH02107872A/en active Granted
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8375970B2 (en) | 2008-11-10 | 2013-02-19 | Access Business Group International Llc | Valve system |
| US8443825B2 (en) | 2008-11-10 | 2013-05-21 | Access Business Group International Llc | Faucet valve system |
| WO2011103050A1 (en) * | 2010-02-16 | 2011-08-25 | Access Business Group International Llc | Valve system |
| KR101486492B1 (en) * | 2012-10-04 | 2015-01-27 | 한국기계연구원 | Proportional control valve |
| KR101437126B1 (en) * | 2012-11-20 | 2014-09-02 | 한국기계연구원 | Proportional Control Valve |
| KR101448821B1 (en) * | 2013-02-01 | 2014-10-13 | 한국기계연구원 | Method and apparatus for controlling proportional control valve |
| CN106764376A (en) * | 2017-01-19 | 2017-05-31 | 徐工集团凯宫重工南京有限公司 | A kind of two-wire lubricates automatic diverter valve |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0550632B2 (en) | 1993-07-29 |
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