JPH0740780Y2 - Multiple selector valve - Google Patents

Multiple selector valve

Info

Publication number
JPH0740780Y2
JPH0740780Y2 JP1988129376U JP12937688U JPH0740780Y2 JP H0740780 Y2 JPH0740780 Y2 JP H0740780Y2 JP 1988129376 U JP1988129376 U JP 1988129376U JP 12937688 U JP12937688 U JP 12937688U JP H0740780 Y2 JPH0740780 Y2 JP H0740780Y2
Authority
JP
Japan
Prior art keywords
port
cylinder
tank
ports
spool insertion
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.)
Expired - Lifetime
Application number
JP1988129376U
Other languages
Japanese (ja)
Other versions
JPH0250577U (en
Inventor
学 小郷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Kiki Co Ltd
Original Assignee
Sanyo Kiki Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sanyo Kiki Co Ltd filed Critical Sanyo Kiki Co Ltd
Priority to JP1988129376U priority Critical patent/JPH0740780Y2/en
Priority to EP89305711A priority patent/EP0361643A1/en
Publication of JPH0250577U publication Critical patent/JPH0250577U/ja
Application granted granted Critical
Publication of JPH0740780Y2 publication Critical patent/JPH0740780Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/06Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with two or more servomotors

Description

【考案の詳細な説明】 〔産業上の利用分野〕 本考案は、農用フロントローダ等に利用する多連セレク
タバルブに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a multiple selector valve used for an agricultural front loader or the like.

〔従来の技術〕[Conventional technology]

一般にセレクタバルブは、第2図に示す様に、スプール
挿通孔(1)の中央部に、ポンプポート(P)を、この
ポンプポート(P)の両側に2組分のシリンダポート
(D)(A)、(C)(B)を、両側にバイパス回路
(T3)で連通させたタンクポート(T1)(T2)を夫々等
間隔に配設してなるハウジング(2)と、このハウジン
グ(2)のスプール挿通孔(1)に左右2位置に切換え
摺動可能に挿入され、一方の位置(右)で一方のシリン
ダポート(D)(C)を遮断すると共に、他方のシリン
ダポート(A)(B)をポンプポート(P)とタンクポ
ート(T1)とに連通させて一方の油圧シリンダ(3)を
駆動可能とし、他方の位置(左)で上記他方のシリンダ
ポート(A)(B)を遮断すると共に上記一方のシリン
ダポート(D)(C)をポンプポート(P)とタンクポ
ート(T2)とに連通させて他方の油圧シリンダ(4)を
駆動可能とする2つの制御部(5a)(5b)を有するスプ
ール(5)とで構成されている。
Generally, as shown in FIG. 2, a selector valve has a pump port (P) at the center of a spool insertion hole (1) and two sets of cylinder ports (D) (on both sides of this pump port (P). A housing (2) in which tank ports (T 1 ) (T 2 ) are provided at both sides of which A), (C) and (B) are connected by a bypass circuit (T 3 ) and are arranged at equal intervals. It is slidably inserted into the spool insertion hole (1) of the housing (2) at two positions, left and right, and at one position (right), one cylinder port (D) (C) is blocked and the other cylinder port is blocked. (A) and (B) are connected to the pump port (P) and the tank port (T 1 ) so that one hydraulic cylinder (3) can be driven, and at the other position (left), the other cylinder port (A). ) (B) is shut off and one of the cylinder ports (D) (C) ) Is connected to the pump port (P) and the tank port (T 2 ) so that the other hydraulic cylinder (4) can be driven, and a spool (5) having two control parts (5a) (5b) Has been done.

上記セレクタバルブは、油圧回路記号で示せば、第3図
の構成であって、このセレクタバルブ(N)の切換動作
により、2つの油圧シリンダ(3)(4)を交互に作動
可能とするもので、夫々の油圧シリンダ(3)(4)の
作動方向の切換えは、方向切換弁(S)によって行われ
る。
The selector valve has the configuration shown in FIG. 3 if it is shown by a hydraulic circuit symbol, and the two switching cylinders (3) and (4) can be operated alternately by the switching operation of the selector valve (N). The switching of the operating directions of the hydraulic cylinders (3) and (4) is performed by the direction switching valve (S).

〔考案が解決しようとする課題〕[Problems to be solved by the device]

一般に、農用フロントローダの場合、リフトアームの昇
降シリンダ、先端作業機器の作動用シリンダ、さらに、
付属機器の作動用シリンダが使用され、これらの各シリ
ンダは、夫々、方向切換弁によって正逆動作せしめら
れ、この方向切換弁は運転席に設置され、各シリンダ
は、運転席から離隔した夫々の設置箇所に設置される。
Generally, in the case of an agricultural front loader, a lifting arm lifting cylinder, a working cylinder for tip working equipment, and
Cylinders for operating auxiliary equipment are used.Each of these cylinders is operated in the forward and reverse directions by a directional control valve.The directional control valve is installed in the driver's seat, and each cylinder is separated from the driver's seat. It will be installed at the installation location.

上記方向切換弁を運転席に設置しているのは、各弁のス
プールを手動レバーで切換動作させるためであって、こ
のように手動レバーで切換動作させるのは、操作者に操
縦感覚を実感させるためである。
The reason why the above-mentioned directional control valve is installed in the driver's seat is that the spool of each valve is switched by the manual lever, and the switching operation by the manual lever in this way gives the operator a feeling of control. This is to allow it.

このように、運転席から離隔した位置に配置される各シ
リンダに対して、運転席に設置される各シリンダ操作用
の方向切換弁から各シリンダに向けて2本づつ油圧配管
を配設する必要がある。
In this way, for each cylinder arranged at a position away from the driver's seat, it is necessary to dispose two hydraulic pipes from the direction switching valve for operating each cylinder installed in the driver's seat toward each cylinder. There is.

これがため、運転席から各シリンダまでの長い配管が必
要となり、錯綜化するのみならず、シリンダの設置数が
多くなると、配管本数が増加し、各配管の両端の接続部
での油洩れ箇所も増加し、また、配管の切換等も発生し
易い。
For this reason, long pipes from the driver's seat to each cylinder are required, which not only complicates, but also increases the number of installed cylinders, which increases the number of pipes, and also causes oil leaks at the connection parts at both ends of each pipe. In addition, the number of pipes is likely to change and the switching of pipes is likely to occur.

上記配管本数の増加は、各方向切換弁に対して、油圧ポ
ンプと油タンクとに接続する配管が必要であり、シリン
ダ数が増加すれば、このための配管が増加する。
The increase in the number of pipes requires pipes to be connected to the hydraulic pump and the oil tank for each directional control valve. If the number of cylinders increases, the pipes for this increase.

第3図に示すセレクタバルブは、上記の問題点をある程
度解消できるが、シリンダ数が2個以上になると、シリ
ンダが1個増加する毎に第4図のような配管(6)
(7)が別途必要となり、配管が錯綜化し、損傷や破損
の機会が増加し、油洩れ箇所も増大する等の問題点があ
った。
The selector valve shown in FIG. 3 can solve the above problems to some extent, but when the number of cylinders is 2 or more, the pipe (6) as shown in FIG.
Since (7) is required separately, there are problems that the piping becomes complicated, the chances of damage and damage increase, and the number of oil leaks increases.

本考案は、農用フロントローダ等の油圧回路において、
運転席に設置される方向切換弁と複数のシリンダとを接
続する油圧配管本数を少なくし、配管長さをできるだけ
短縮化するための多連セレクタバルブを提供することを
目的とするものである。
The present invention, in a hydraulic circuit such as an agricultural front loader,
An object of the present invention is to provide a multiple selector valve for reducing the number of hydraulic pipes connecting the directional control valve installed in the driver's seat and a plurality of cylinders and reducing the pipe length as much as possible.

[課題を解決するための手段] 上記目的を達成するため、本考案は、シリンダの設置個
数nに対して、スプール挿通孔(1)をn−1個適宜間
隔で並列形成し、各スプール挿通孔(1)の中央部に1
個のポンプポート(P)を設け、このポンプポート
(P)の両側に2個づつ4個(2組分)のシリンダポー
ト(D)(A),(C)(B)を上記符号の記載配置通
りで設け、さらにこれらの両側に1個づつ2個のタンク
ポート(T1)(T2)を設け、かつ、両タンクポート
(T1)(T2)間をバイパス回路(T3)で連通させ、隣接
するスプール挿通孔(1)(1)のうちの一方のスプー
ル挿通孔(1)の1組分(2個)のシリンダポート
(D)(C)と他方のスプール挿通孔(1)のタンクポ
ート(T2)及びポンプポート(P)とを連通路(8)
(9)で連通させて、全スプール挿通孔(1)・・のシ
リンダポートを順次直列接続で連通させた1つのハウジ
ング(2)と、 上記ハウジング(2)の各スプール挿通孔(1)・・
に、夫々独立して切換摺動可能に挿入され、一方の切換
位置で1組分のシリンダポート(A)(B)をポンプポ
ート(P)及びタンクポート(T1)に連通させ、他方の
切換位置で他の1組分のシリンダポート(D)(C)を
ポンプポート(P)及びタンクポート(T2)に連通させ
るよう2者択一的に連通遮断する制御部を有する2位置
切換型の複数のスプール(5)・・とからなり、 上記ハウジング(2)に並列配置された各スプール挿通
孔(1)・・のうちの最後のもののシリンダポートには
2個のシリンダを接続し、これ以外のもののシリンダポ
ートには1個のシリンダを接続すると共に、最初のもの
のポンプポート(P)及びタンクポート(T1)には1個
の方向切換弁を介してポンプ及びタンクに接続し、全シ
リンダを上記1個の方向切換弁を共用して択一的に作動
させるようになしたものである。
[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention forms n-1 spool insertion holes (1) in parallel with the installation number n of cylinders at appropriate intervals, and inserts each spool. 1 in the center of the hole (1)
Each pump port (P) is provided, and two cylinder ports (D) (A), (C) and (B) are provided on each side of the pump port (P), two on each side of the pump port (P). provided in an arrangement as further one by one two tank ports to these sides (T 1) (T 2) to provided, and both the tank port (T 1) (T 2) between the bypass circuit (T 3) The spool ports (1) (1) of the adjacent spool insertion holes (1) (1) for one set (two) of the cylinder ports (D) (C) and the other spool insertion hole (1). The communication port (8) with the tank port (T 2 ) and pump port (P) of 1)
One housing (2) in which the cylinder ports of all the spool insertion holes (1) ... Are sequentially connected in series by communicating with each other at (9), and each spool insertion hole (1) of the above housing (2).・
Are independently inserted so that they can be slidably switched, and at one switching position, one set of cylinder ports (A) and (B) communicates with the pump port (P) and the tank port (T 1 ), and the other Two-position switching having a control unit that selectively shuts off the communication so that the other set of cylinder ports (D) and (C) communicates with the pump port (P) and the tank port (T 2 ) at the switching position. , And a cylinder port of the last one of the spool insertion holes (1), which are arranged in parallel in the housing (2), and are connected to two cylinders. , One cylinder is connected to the cylinder ports of other than this, and one pump port (P) and tank port (T 1 ) are connected to the pump and tank via one directional valve , All cylinders are the above one The directional control valve is shared and operated selectively.

[作用] シリンダの設置数がいくら増加しても、運転席に設置さ
れる方向切換弁は、1個でよく、かつ、方向切換弁とセ
レクタバルブとの間の配管も2本だけでよい。しかも、
セレクタバルブ相互間の配管が省略できる。
[Operation] No matter how many cylinders are installed, only one directional switching valve may be installed in the driver's seat, and only two pipes may be provided between the directional switching valve and the selector valve. Moreover,
Piping between selector valves can be omitted.

〔実施例〕〔Example〕

第1図は本考案の一実施例を示す2連セレクタバルブの
中央縦断面図であって、(1)(1)はスプール挿通
孔、(2)はハウジング、(3)(4)(10)は油圧シ
リンダ、(5)(5)はスプールを示している。
FIG. 1 is a central longitudinal sectional view of a dual selector valve showing an embodiment of the present invention, in which (1) and (1) are spool insertion holes, (2) is a housing, and (3), (4) and (10). ) Indicates a hydraulic cylinder, and (5) and (5) indicate spools.

上記スプール挿通孔(1)(1)は、ハウジング(2)
内を横方向に貫通して並列形成してあり、各スプール挿
通孔(1)には、その中央部にポンプポート(P)を、
その両側に2組分のシリンダポート(D)(A)、
(C)(B)を、両端にタンクポート(T1)(T2)を夫
々等間隔に配設してあり、両端のタンクポート(T1
(T2)は、ハウジング(2)内に形成したバイパス回路
(T3)で連通させてある。
The spool insertion hole (1) (1) is provided in the housing (2).
Each of the spool insertion holes (1) has a pump port (P) at its center,
Two sets of cylinder ports (D) (A) on both sides,
(C) and (B), tank ports (T 1 ) and (T 2 ) are arranged at equal intervals at both ends, and tank ports (T 1 ) at both ends
(T 2 ) is connected by a bypass circuit (T 3 ) formed in the housing (2).

また、隣接する2列の一方の列の1組分のシリンダポー
ト(D)(C)と他方の列のタンクポート(T2)及びポ
ンプポート(P)とをハウジング(2)内に形成した連
通路(8)(9)で連通させている。
Further, one set of cylinder ports (D) and (C) in one row of two adjacent rows and the tank port (T 2 ) and pump port (P) of the other row are formed in the housing (2). The communication paths (8) and (9) are used for communication.

各スプール(5)は、ハウジング(2)のスプール挿通
孔(1)内に夫々左右2位置に切換え摺動可能に挿入さ
れ、一方の切換位置で1組分のシリンダポート(A)
(B)をポンプポート(P)及びタンクポート(T1)に
連通させると共に、他の1組分のシリンダポート(D)
(C)を遮断し、他方の切換位置では上記1組分のシリ
ンダポート(A)(B)を遮断すると共に、他の1組分
のシリンダポート(D)(C)をポンプポート(P)及
びタンクポート(T2)に連通させる2つの制御部(5a)
(5b)を有している。
Each spool (5) is slidably inserted into the spool insertion hole (1) of the housing (2) in two left and right positions, and one set of cylinder ports (A) is inserted at one of the switching positions.
(B) is connected to the pump port (P) and the tank port (T 1 ) and at the same time, another set of cylinder ports (D)
(C) is shut off, and at the other switching position, the above-mentioned one set of cylinder ports (A) and (B) is shut off, and the other one set of cylinder ports (D) and (C) is cut off at the pump port (P). And two control parts (5a) communicating with the tank port (T 2 ).
It has (5b).

上記2連用セレクタバルブは、一方(上側)では油圧シ
リンダ(3)(4)へ接続するシリンダポート(D)
(C)と(A)(B)との形成位置を、ハウジング
(2)に対して、同一面、反対面、或いは直交した面に
形成させることが可能であり、他方(下側)でも同様で
ある。
The dual selector valve is a cylinder port (D) that connects to the hydraulic cylinders (3) and (4) on one side (upper side).
The formation positions of (C) and (A) and (B) can be formed on the same surface, opposite surfaces, or orthogonal surfaces with respect to the housing (2), and the other (lower side) is also the same. Is.

次に、3連用セレクタバルブとする場合は、中間列のセ
レクタバルブの2組のシリンダポート(D)(C)、
(A)(B)のうち、ポート(D)(C)は、次の列の
セレクタバルブのポンプポート(P)及びタンクポート
(T2)にハウジング(2)内で連通路(8)(9)によ
り連通し、ポート(A)(B)を第1図の紙面表方向又
は裏方向に形成する。
Next, in the case of using a selector valve for three stations, two sets of cylinder ports (D) and (C) of the selector valve in the middle row,
Of (A) and (B), the ports (D) and (C) are connected to the pump port (P) and the tank port (T 2 ) of the selector valve in the next row in the housing (2) by the communication passage (8) ( 9) to communicate with each other to form the ports (A) and (B) in the front or back direction of the paper surface of FIG.

3連用以上の多連用セレクタバルブは、上記の構成を利
用して構成すればよい。
A selector valve for three or more stations may be constructed using the above configuration.

〔考案の効果〕[Effect of device]

本考案によれば、シリンダの設置数がいくら増加して
も、運転席に設置される方向切換弁は、1個でよく、か
つ、方向切換弁とセレクタバルブとの間の配管も2本だ
けでよい。しかも、セレクタバルブ相互間の配管が省略
できる。従って、本考案は、農用フロントローダ等の油
圧回路に適用し、運転席に設置される方向切換弁と複数
のシリンダとを接続する油圧配管本数を少なくし、配管
長さをできるだけ短縮化することができ、配管の錯綜化
に起因する損傷や破損を減少させ、油洩れ箇所も削減で
きる利点がある。
According to the present invention, no matter how many cylinders are installed, only one directional control valve needs to be installed in the driver's seat, and only two pipes are provided between the directional control valve and the selector valve. Good. Moreover, piping between the selector valves can be omitted. Therefore, the present invention is applied to a hydraulic circuit of an agricultural front loader or the like to reduce the number of hydraulic pipes connecting the directional control valve installed in the driver's seat and a plurality of cylinders, and to shorten the pipe length as much as possible. Therefore, there is an advantage that damage and breakage due to the complicatedness of the pipe can be reduced, and the oil leakage location can be reduced.

【図面の簡単な説明】[Brief description of drawings]

第1図は本考案の一実施例を示す2連セレクタバルブの
中央縦断面図、第2図は従来のセレクタバルブの中央縦
断面図、第3図は第2図のセレクタバルブの油圧記号回
路図、第4図は従来のセレクタバルブによる3個の油圧
シリンダを作動させるための油圧記号回路図である。 (1)…スプール挿通孔、(2)…ハウジング、(3)
(4)(10)…油圧シリンダ、(5)…スプール、
(8)(9)…連通路、(A)(B)(C)(D)…シ
リンダポート、(P)…ポンプポート、(T1)(T2)…
タンクポート、(T3)…バイパス回路、(S)…方向切
換弁。
FIG. 1 is a central longitudinal sectional view of a dual selector valve showing an embodiment of the present invention, FIG. 2 is a central longitudinal sectional view of a conventional selector valve, and FIG. 3 is a hydraulic symbol circuit of the selector valve of FIG. FIGS. 4 and 5 are hydraulic symbol circuit diagrams for operating three hydraulic cylinders by a conventional selector valve. (1) ... Spool insertion hole, (2) ... Housing, (3)
(4) (10) ... hydraulic cylinder, (5) ... spool,
(8) (9) ... communicating passage, (A) (B) (C) (D) ... cylinder port, (P) ... pump port, (T 1) (T 2) ...
Tank port, (T 3) ... bypass circuit, (S) ... directional control valve.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】シリンダの設置個数n個に対して、スプー
ル挿通孔(1)をn−1個適宜間隔で並列形成し、各ス
プール挿通孔(1)の中央部に1個のポンプポート
(P)を設け、このポンプポート(P)の両側に2個づ
つ4個(2組分)のシリンダポート(D)(A),
(C)(B)を上記符号の記載配置通りで設け、さらに
これらの両側に1個づつ2個のタンクポート(T1
(T2)を設け、かつ、両タンクポート(T1)(T2)間を
バイパス回路(T3)で連通させ、隣接するスプール挿通
孔(1)(1)のうちの一方のスプール挿通孔(1)の
1組分(2個)のシリンダポート(D)(C)と他方の
スプール挿通孔(1)のタンクポート(T2)及びポンプ
ポート(P)とを連通路(8)(9)で連通させて、全
スプール挿通孔(1)・・のシリンダポートを順次直列
接続で連通させた1つのハウジング(2)と、 上記ハウジング(2)の各スプール挿通孔(1)・・
に、夫々独立して切換摺動可能に挿入され、一方の切換
位置で1組分のシリンダポート(A)(B)をポンプポ
ート(P)及びタンクポート(T1)に連通させ、他方の
切換位置で他の1組分のシリンダポート(D)(C)を
ポンプポート(P)及びタンクポート(T2)に連通させ
るよう2者択一的に連通遮断する制御部を有する2位置
切換型の複数のスプール(5)・・とからなり、 上記ハウジング(2)に並列配置された各スプール挿通
孔(1)・・のうちの最後のもののシリンダポートには
2個のシリンダを接続し、これ以外のもののシリンダポ
ートには1個のシリンダを接続すると共に、最初のもの
のポンプポート(P)及びタンクポート(T1)には1個
の方向切換弁を介してポンプ及びタンクに接続し、全シ
リンダを上記1個の方向切換弁を共用して択一的に作動
させるようになしたことを特徴とする多連セレクタバル
ブ。
1. Spool insertion holes (1) are formed in parallel at an appropriate interval for n installed cylinders, and one pump port (1) is provided at the center of each spool insertion hole (1). P) is provided, and two (2 sets) cylinder ports (D) (A), two on each side of this pump port (P),
(C) and (B) are provided as in the arrangement described above, and two tank ports (T 1 ) are provided, one on each side.
(T 2 ) is provided, and both tank ports (T 1 ) and (T 2 ) are connected by a bypass circuit (T 3 ), and one of the adjacent spool insertion holes (1) (1) is inserted. One set (two) of cylinder ports (D) (C) of the hole (1) and the tank port (T 2 ) and pump port (P) of the other spool insertion hole (1) are connected to each other by a communication passage (8). One housing (2) in which the cylinder ports of all the spool insertion holes (1) ... Are sequentially connected in series by communicating with each other at (9), and each spool insertion hole (1) of the above housing (2).・
Are independently inserted so that they can be slidably switched, and at one switching position, one set of cylinder ports (A) and (B) communicates with the pump port (P) and the tank port (T 1 ), and the other Two-position switching having a control unit that selectively shuts off the communication so that the other set of cylinder ports (D) and (C) communicates with the pump port (P) and the tank port (T 2 ) at the switching position. , And a cylinder port of the last one of the spool insertion holes (1), which are arranged in parallel in the housing (2), and are connected to two cylinders. , One cylinder is connected to the cylinder port of other than this, and one pump port (P) and the tank port (T 1 ) are connected to the pump and the tank via one directional valve. , All cylinders are the above one A multiple selector valve characterized in that it is designed to operate selectively by sharing a directional switching valve.
JP1988129376U 1988-09-30 1988-09-30 Multiple selector valve Expired - Lifetime JPH0740780Y2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1988129376U JPH0740780Y2 (en) 1988-09-30 1988-09-30 Multiple selector valve
EP89305711A EP0361643A1 (en) 1988-09-30 1989-06-07 Multi-stage selector valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988129376U JPH0740780Y2 (en) 1988-09-30 1988-09-30 Multiple selector valve

Publications (2)

Publication Number Publication Date
JPH0250577U JPH0250577U (en) 1990-04-09
JPH0740780Y2 true JPH0740780Y2 (en) 1995-09-20

Family

ID=15008052

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988129376U Expired - Lifetime JPH0740780Y2 (en) 1988-09-30 1988-09-30 Multiple selector valve

Country Status (2)

Country Link
EP (1) EP0361643A1 (en)
JP (1) JPH0740780Y2 (en)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2362944A (en) * 1942-06-30 1944-11-14 Hydraulic Control Engineering Control valve for hydraulic systems
US2710628A (en) * 1954-10-11 1955-06-14 New York Air Brake Co Control valve with inherent circuit protection
US3162095A (en) * 1962-03-26 1964-12-22 New York Air Brake Co Fluid distribution system
US3216443A (en) * 1963-03-11 1965-11-09 Parker Hannifin Corp Multiple spool valve assembly
JPS57157804A (en) * 1981-03-25 1982-09-29 Mazda Motor Corp Multi-valve construction
JPS5821007A (en) * 1981-07-29 1983-02-07 Uchida Yuatsu Kiki Kogyo Kk Multiple-type changeover valve device
US4489644A (en) * 1981-08-06 1984-12-25 Toshiba Kikai Kabushiki Kaisha Multiple control valves

Also Published As

Publication number Publication date
JPH0250577U (en) 1990-04-09
EP0361643A1 (en) 1990-04-04

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