JPS60164079A - Valve device - Google Patents
Valve deviceInfo
- Publication number
- JPS60164079A JPS60164079A JP1788184A JP1788184A JPS60164079A JP S60164079 A JPS60164079 A JP S60164079A JP 1788184 A JP1788184 A JP 1788184A JP 1788184 A JP1788184 A JP 1788184A JP S60164079 A JPS60164079 A JP S60164079A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- small diameter
- coil spring
- diameter
- small
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Temperature-Responsive Valves (AREA)
- Check Valves (AREA)
- Safety Valves (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野）
本発明は、■１鎖州、逆止弁等として使用される弁装置
に関し、特に弁体をＩｆ弁方向にイ１勢するコイルスプ
リングの組付対策に関づる。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to (1) a valve device used as a chain valve, a check valve, etc., and in particular a coil spring that biases a valve body in the If valve direction; Related to assembly measures.
（従来技術）
従来、例えばルームクーラ用閉鎖弁の一例として、第５
図にその要部を示すように、内周壁に弁座（ａ）が形成
された弁ケーシング（ｂ）と、該弁ケーシング（ｂ）に
接続され、途中部にスプリング受け用の小径段部（ｃ）
が形成された接続管（ｄ）と、該接続管（ｄ）側から上
記弁座（ａ）に接岨して該弁座（ａ）を間閉づ゛る弁休
（Ｑ）と、該弁体（８）を閉弁方向に付勢寸るコイルス
プリング（ｆ）とを備え、常時はコイルスプリング（ｆ
）の付勢力により閉じている弁体｛：ｅ）を、該コイル
スプリング（ｆ）の付勢力に抗して押圧することにより
開くようにしたものがある（実聞昭５８−７２５６．９
＠公報参照）。そして、上記コイルスプリング（ｆ）は
、その一端が弁休（ｅ）に当接され、他端がスプリング
受け部１１（（］）を介して小径段部（Ｃ）に係止され
ており、該スプリング受け部材＜（Ｊ）は小径段部（Ｃ
）との係止閏係から該小径段部（Ｃ′）よりも大径のも
のが使用される。(Prior art) Conventionally, for example, as an example of a room cooler shutoff valve, the fifth
As shown in the figure, the main parts include a valve casing (b) in which a valve seat (a) is formed on the inner circumferential wall, and a small-diameter stepped part for a spring receiver ( c)
a connecting pipe (d) in which a connecting pipe (d) is formed; a valve rest (Q) that extends from the connecting pipe (d) side to the valve seat (a) to temporarily close the valve seat (a); It is equipped with a coil spring (f) that biases the valve body (8) in the valve closing direction, and the coil spring (f
) The valve body {:e), which is closed by the urging force of the coil spring (f), is opened by pressing against the urging force of the coil spring (f).
@Refer to the official bulletin). One end of the coil spring (f) is brought into contact with the valve rest (e), and the other end is locked with the small diameter step part (C) via the spring receiving part 11 (()), The spring receiving member < (J) has a small diameter stepped portion (C
) is used which has a larger diameter than the small diameter stepped portion (C').
そのため、上記スプリング受け部材（ｇ）は、組立時、
接続管（ｄ）内へ小径段部（Ｃ）側から挿入することは
不可能であり、そのことから、該接続管（ｄ）と弁ケー
シング（ｂ）とは分割構造に形成されていて、組立時に
接続管（ｄ）の接続端側からスプリング受け部材（ｇ）
、コイルスプリング（ｆ）および弁体（ｅ）を挿入した
のち、該接続管（ｄ）を図示の如く、該接続管（ｄ）の
接続端に設けた継手管部（１１）を介して弁ケーシング
（ｂ）に螺合接統することが行われている。Therefore, when assembling the spring receiving member (g),
It is impossible to insert into the connecting pipe (d) from the small diameter stepped portion (C) side, and for this reason, the connecting pipe (d) and the valve casing (b) are formed in a split structure, When assembling, remove the spring receiving member (g) from the connecting end of the connecting pipe (d).
, after inserting the coil spring (f) and the valve body (e), connect the connecting pipe (d) to the valve via the joint pipe section (11) provided at the connecting end of the connecting pipe (d), as shown in the figure. Threaded connection to the casing (b) is performed.
その結果、接続管（ｄ）と弁ケーシング（ｂ）との接続
構造が複雑なものとなり、また弁装置の漏れ箇所が多く
なるという欠点があった。As a result, the connection structure between the connecting pipe (d) and the valve casing (b) becomes complicated, and the valve device has many leakage points.
尚、上記コイルスプリング（ｆ）の代わりに、螺旋形の
スプリングを使用し、小径端を弁体＜ｅ＞に当接し、他
端の大径端を小径段部（Ｃ）に当接係止させて、上記ス
プリング受け部材（ｇ）を不要にした場合においても、
該螺旋形スプリングを接続管（ｄ）の小径段部（Ｃ）側
から挿入できず上記と同様の問題が生じる。In addition, instead of the above-mentioned coil spring (f), a helical spring is used, and the small diameter end is brought into contact with the valve body <e>, and the other large diameter end is brought into contact and locked with the small diameter stepped portion (C). Even when the above spring receiving member (g) is made unnecessary,
The helical spring cannot be inserted from the small diameter stepped portion (C) side of the connecting pipe (d), resulting in the same problem as above.
（発明の目的）
本発明はかかる点に鑑みてなされたもので、その目的と
するところは、上記の如き閉鎖弁や逆止弁等の弁装置に
おいて、弁体を閉弁方向に付勢するコイルスプリングを
、一方向形状記憶合金で大径部分と小径部分とを有する
コイル状に形成して、マルテンサイト変態点以下で大径
部分を小径部分と同径に変形し、接続管の小径段部側か
ら挿入したのち、マルテンサイト変態点以上に加熱して
従前の形状に変化し該小径段部に係合り′るものど４る
ことにより、組立時に接続管の小径段部側からの組付け
を可能どして、従来の如き継手管部を介する接続管と弁
ケーシングとの接続構造をなくすることにある。(Object of the Invention) The present invention has been made in view of the above points, and its purpose is to bias the valve body in the valve closing direction in a valve device such as a stop valve or a check valve as described above. The coil spring is formed into a coil shape having a large diameter portion and a small diameter portion using a unidirectional shape memory alloy, and the large diameter portion is deformed to the same diameter as the small diameter portion below the martensitic transformation point, and the small diameter step of the connecting pipe is formed. After inserting from the small-diameter step side, it is heated above the martensitic transformation point and changes to its previous shape and engages the small-diameter step. The purpose is to eliminate the conventional connection structure between a connecting pipe and a valve casing via a joint pipe part by making assembly possible.
（発明の構成）
上記目的を達成するため、本発明の構成は、内周壁に弁
座が形成された弁ケーシングと、該弁ケーシングに接続
され、途中部にスプリング受け用の小径段部が形成され
た接続管と、該接続管の小径段部側から挿入され、上記
弁座に接離して該弁座を間閉する弁休と、該弁体と小径
段部との間に介装され，弁休を閑弁方向に付勢するコイ
ルスプリングとを備え、上記コイルスプリングは、マル
テンザイ｛・変態点以下で接続管の小径段部を挿通可能
な径を有し、マルテンサイト変態点以上で小径段部側の
部分が小径段部に係止されるように大径に形状変化する
一方向形状記憶合金によって形成されていることを特徴
とするものである。(Structure of the Invention) In order to achieve the above object, the structure of the present invention includes a valve casing in which a valve seat is formed on the inner circumferential wall, and a small-diameter step part connected to the valve casing and formed in the middle for receiving a spring. a connecting pipe inserted from the small-diameter step side of the connecting pipe, a valve rest that approaches and separates from the valve seat to close the valve seat, and a valve stopper interposed between the valve body and the small-diameter step. , a coil spring that biases the valve rest in the direction of the idle valve, and the coil spring has a diameter that can be inserted through the small diameter stepped portion of the connecting pipe at a temperature below the martensitic transformation point, and a coil spring that biases the valve rest in the direction of the idle valve. It is characterized in that the portion on the side of the small-diameter step is formed of a unidirectional shape memory alloy that changes shape to a larger diameter so as to be locked to the small-diameter step.
このことにより、組立時、弁ケーシングに接続された接
続管の小径段部側から、マルテンサイト変態点以下で該
接続管の小径段部よりも小径の状態のコイルスプリング
を弁体と共に挿入したのちマルテンサイト変態点以上に
加熱することによって、上記コイルスプリングの小径段
部側の部分が小径段部よりも大径に形状変化して、一端
を弁体に当接ぜしめた状態で該小径段部に係止され、該
弁体を閉弁方向に付勢するように組付け５Ｊ能にしたも
のである。As a result, during assembly, the coil spring, which is below the martensitic transformation point and has a smaller diameter than the small diameter step of the connecting pipe, is inserted from the small diameter step side of the connecting pipe connected to the valve casing together with the valve body. By heating above the martensitic transformation point, the portion of the coil spring on the small diameter step side changes its shape to a larger diameter than the small diameter step, and the small diameter step is closed with one end in contact with the valve body. The valve element is assembled in a 5J capacity so as to be engaged with the valve body and bias the valve element in the valve closing direction.
（発明の効果）
したがって、本発明の弁装置によれば、弁体を閑弁方向
に付勢する一方向形状記憶合金製のコイルスプリングを
、弁休と共に、弁ケーシングに接続された接続管のスプ
リング受け用小径段部側から挿入し、加熱による形状変
化により該小径段部に係合して相付け可能にしたので、
接続管の弁ケーシングへの接続構造が簡単な同名構造で
済み、従来の如き継手管部を介づる螺合構造が不要とな
り、よって構造の簡単化により加Ｊ．工数が削減でき、
また漏れ箇所を削減できる効果を奏ずるものである。(Effects of the Invention) Therefore, according to the valve device of the present invention, the coil spring made of a one-way shape memory alloy that biases the valve body in the valve rest direction is attached to the connecting pipe connected to the valve casing together with the valve rest. It is inserted from the side of the small diameter stepped part for the spring receiver, and the shape changes due to heating so that it can be engaged with the small diameter stepped part and mated.
The connecting structure of the connecting pipe to the valve casing can be simply the same structure, eliminating the need for the conventional screwing structure via the joint pipe. Man-hours can be reduced,
It also has the effect of reducing leakage points.
（実施例）
以下、本発明の実施例を図面に基づいて詳細に説明する
。(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.
第１図は本発明をルームクーラ用閉蛸弁に適用した実施
例を示し、（１）は弁ケーシングであって、該弁ケーシ
ング（１》の一端側の内周壁には弁座（２）が形成され
ている。（３）は上記弁ケーシング（１）の一端に固着
接続された接続管であって、該接続管〈３）の途中部に
は後述のコイルスプリング（７）の他端を係止するため
のスプリング受け用の小径段部（４）が形成されている
。FIG. 1 shows an embodiment in which the present invention is applied to a closed valve for a room cooler. (3) is a connecting pipe firmly connected to one end of the valve casing (1), and the other end of a coil spring (7), which will be described later, is located in the middle of the connecting pipe (3). A small-diameter stepped portion (4) for receiving a spring is formed to lock the spring.
また、（５》は上記接続管（３）側から弁座（２）に接
岨して該弁座（２）を開閉する弁体であって、該弁休（
５》は、接続管（３）の一端開口部（３ａ）から小径段
部〈４）を経て弁座（２）へ挿入可能なように該小径段
部（４）の内径Ｄθ以下の径に設定されており、また弁
休（５）の頭部には閉弁時に弁座〈２）に密接するよう
にゴム等の弾性部材（６）が被覆されている。さらに、
（７）は、一端が弁体（５》に当接し、他端が小径段部
（４》に係合当接するように両者間に介装されて弁体く
５）を閉弁方向に付勢するコイルスプリングである。以
上によって、弁休（５》をコイルスプリング（７）の付
勢力により弁座（２）に当接させて閉じる一方、弁休（
５）をコイルスプリング（７）の付勢力に抗して押圧す
ることにより弁座（２）から離反させて開くようにした
閉鎖弁を横成している。Further, (5) is a valve body that approaches the valve seat (2) from the connecting pipe (3) side to open and close the valve seat (2), and the valve body (5)
5) has a diameter equal to or smaller than the inner diameter Dθ of the small diameter stepped portion (4) so that it can be inserted into the valve seat (2) from the opening (3a) at one end of the connecting pipe (3) via the small diameter stepped portion (4). The head of the valve rest (5) is covered with an elastic member (6) such as rubber so as to come into close contact with the valve seat (2) when the valve is closed. moreover,
(7) is inserted between the two so that one end abuts the valve body (5) and the other end engages and abuts the small diameter stepped portion (4), and the valve body (5) is attached in the valve closing direction. As described above, the valve rest (5) is brought into contact with the valve seat (2) and closed by the urging force of the coil spring (7), while the valve rest (5) is closed by the urging force of the coil spring (7).
5) is pressed against the biasing force of a coil spring (7), thereby forming a closing valve that is moved away from the valve seat (2) and opened.
そして、上記コイルスプリング（７》は、高渦相のみの
形状を記憶する一方向形状記憶合金によって形成されて
いて、マルテンサイト変態点ＭＳ以下では第３図に示ず
ように接続管（３》の小径段部（４）を挿通可能なよう
に該小径段部（４》の内径ＤＯ以下のほぼ一様な径Ｄ１
を有し、マルテンサイト変態点ＭＳ以上では第４図に示
づように小径段部側の部分（他端側の部分）（７ａ）が
小径段部（４）に係止されるように該小径段部（４）の
内径ＤＯよりも大きい径Ｄ２に形状変化して、いわゆる
段付き形状となるものである。つまり、マルテンサイト
変態点ＭＳ以上（例えば４０℃以上）で第４図の如く段
｛ｄき状に形成された一方向形状記憶合金製コイルスプ
リング（７）を、マルテンザイト変態点Ｍｌ１以下（例
えば常温）で第３図の如くほぼ一様の径のものに変形さ
せ、このマルテンサイト変態点ＭＳ以下の状態で接続管
（３）の小径段部（４》を挿通さゼて挿入したのち、マ
ルテンサイト変態点ＭＳ以上に加熱して元の形状（段付
き形状）に変化させて他端を小径段部（４》に係合させ
るようにしたものである。このような一方向形状記憶合
金としてはｌ”ｉ−Ｎｉ合金など、一般に下記表に示す
ようなものが使用される。The coil spring (7) is made of a unidirectional shape memory alloy that remembers the shape of only the high vortex phase, and below the martensitic transformation point MS, the connecting tube (3) The diameter D1 is substantially uniform and is equal to or smaller than the inner diameter DO of the small diameter stepped portion (4) so that the small diameter stepped portion (4) can be inserted through the small diameter stepped portion (4).
At or above the martensitic transformation point MS, as shown in FIG. The shape changes to a diameter D2 larger than the inner diameter DO of the small diameter stepped portion (4), resulting in a so-called stepped shape. In other words, the coil spring (7) made of a unidirectional shape memory alloy formed in a stepped shape as shown in FIG. After deforming the tube into one with a substantially uniform diameter as shown in Fig. 3 at room temperature) and inserting it through the small diameter stepped portion (4) of the connecting tube (3) in a state below this martensitic transformation point MS, It is heated above the martensitic transformation point MS to change it to its original shape (stepped shape), and the other end is engaged with the small diameter step part (4).Such a unidirectional shape memory alloy Generally, those shown in the table below, such as l''i-Ni alloy, are used.
次に、上記実施例の閑鎖弁の組立手順について第２図に
より説明するに、予め接続管（３）を弁ケーシング（１
）の一端に溶接等によって固着接続した後、コイルスプ
リング（７）を構成する一方向形状記憶合金のマルテン
サイト変態点以下のｔｌｉ度雰囲気下で、望ましくは常
温雰囲気下で、上記接続管（３）の一端開口部（３ａ）
から、マルテンサイト変態点１ｙｌｓ以下の状態のコイ
ルスプリング（７）（第３図の如く小径でほぼ一様径の
もの》を、先端に弁休（５）を当接さＶた状態で該弁体
（５）と共に押圧冶具（８）によって挿入して小径段部
（４）を押通させ、先端の弁休（５）が弁座（２）に着
座した状態でコイルスプリング《７》の後端が完全に小
径段部（４》を挿通した態に抑圧保持する。この状態で
、上記コイルスプリング《７》をマルテンサイト変態点
ＭＳ以上に加熱すると、該＝１イルスプリング（７）の
後端側の部分（小径段部側の部分）（７ａ）が第４図の
如く大径に形状嘴化して段付き形状に形状保持されるこ
とになる。そのことにより、上記押圧冶具（８》を引抜
くと、上記大径となった小径段部側部分（７ａ）の後端
が小径段部（４》に係合して係止されることになり、第
１図の如く組立てられることになる。Next, the assembling procedure of the shut-off valve of the above embodiment will be explained with reference to FIG.
) is firmly connected to one end of the connecting tube (3) by welding or the like, in an atmosphere of tli degree below the martensitic transformation point of the unidirectional shape memory alloy constituting the coil spring (7), preferably in an atmosphere at room temperature. ) One end opening (3a)
Then, a coil spring (7) (with a small diameter and almost uniform diameter as shown in Fig. 3) in a state below the martensitic transformation point 1yls is attached to the valve with the valve rest (5) in contact with the tip. Insert the body (5) together with the pressing jig (8) to push the small diameter step part (4) through, and with the valve rest (5) at the tip seated on the valve seat (2), insert it behind the coil spring <<7>>. The end is pressed and held in a state where it is completely inserted through the small diameter step part (4). In this state, when the above-mentioned coil spring [7] is heated to the martensitic transformation point MS or higher, the coil spring (7) The end portion (portion on the small diameter stepped portion side) (7a) becomes a large diameter beak as shown in Fig. 4 and is held in a stepped shape.Thereby, the pressing jig (8) When pulled out, the rear end of the small-diameter stepped portion (7a), which has become larger in diameter, will engage and be locked with the small-diameter stepped portion (4), and the assembly will be completed as shown in Figure 1. become.
したがって、上記の如く構成としたことにより、接続管
（３）と弁ケーシング（１）とを固着接続したままで、
コイルスプリング（７》を、弁体（５）を閉弁方向に付
勢するように装入、組｛＝Ｊけることができるので、従
来の如く継手管部を介する螺合横造とする必要がなく、
その分加工工数を削減できるとともに、漏れ箇所を少な
くすることができ、よってコストダウン化を図るととも
に作動安定性，信頼性の向上を図ることが可能である。Therefore, by configuring as described above, the connecting pipe (3) and the valve casing (1) can remain firmly connected.
Since the coil spring (7) can be inserted and assembled so as to bias the valve body (5) in the valve-closing direction, it is not necessary to use a horizontal threaded connection via the joint pipe as in the past. There is no
Accordingly, the number of processing steps can be reduced and the number of leakage points can be reduced, thereby reducing costs and improving operational stability and reliability.
尚、上記実施例では開鎖弁に適用した場合について述べ
たが、本発明はその他逆止弁等の各種弁装置に適用可能
であるのは言うまでもない。In the above embodiment, the case where the present invention is applied to an open-close valve has been described, but it goes without saying that the present invention can be applied to various other valve devices such as check valves.
第１図〜第４図は本発明の実施例を例示し、第１図は組
付完了状態の要部縦断面図、第２図は組付け時の要部縦
断面図、第３図および第４図はそれぞれコイルスプリン
グのマルテンサイ１一変態点以下および以上での形状を
示す側面図、第５図は従来例を示す第１図相当図である
。
（１）・・・弁ケーシング、（２）・・・弁座、（３）
・・・接続管、（４）・・・小径段部、（５》・・・弁
体、（７）・・・コイルスプリング。1 to 4 illustrate embodiments of the present invention, in which FIG. 1 is a vertical cross-sectional view of the main part in the assembled state, FIG. 2 is a vertical cross-sectional view of the main part when assembled, and FIG. FIG. 4 is a side view showing the shape of a coil spring below and above the martensis 1 transformation point, respectively, and FIG. 5 is a view corresponding to FIG. 1 showing a conventional example. (1) Valve casing, (2) Valve seat, (3)
...Connecting pipe, (4)...Small diameter stepped portion, (5)...Valve body, (7)...Coil spring.
Claims (1)
１）と、該弁ケーシング（１）に接続され、途中部にス
プリング受け用の小径段部（４〉が形成された接続管（
３）と、該接続管（３）の小径段部（４）側から挿入さ
れ、上記弁座（２）に接離して該弁座（２》を開閉する
弁体（５）と、該弁体（５〉と小径段部（４）との間に
介装され、弁体（５）を閉弁方向に付勢するコイルスプ
リング（７〉とを備え、上記コイルスプリング（７）は
、マルテンサイト変態点以下で接ｖＩ．管（３）の小径
段部（４）を挿通可能な径を有し、マルテンサイト変態
点以上で小径段部側の部分が小径段部（４》に係止され
るように大径に形状変化する一方向形状記憶合金によっ
て形成されでいることを特徴とＪる弁！１ｉ置。(1) Valve casing with a valve seat (2) formed on the inner peripheral wall (
1), and a connecting pipe (4) connected to the valve casing (1) and having a small diameter stepped portion (4) for receiving a spring in the middle.
3), a valve body (5) that is inserted from the small diameter stepped portion (4) side of the connecting pipe (3) and opens and closes the valve seat (2) by approaching and separating it from the valve seat (2); A coil spring (7) is interposed between the body (5) and the small diameter stepped portion (4) and urges the valve body (5) in the valve closing direction, and the coil spring (7) is made of marten. It has a diameter that allows insertion of the small-diameter step (4) of the contact vI. pipe (3) below the site transformation point, and the part on the small-diameter step side is locked to the small-diameter step (4) above the martensitic transformation point. The valve is characterized by being made of a unidirectional shape memory alloy that changes its shape to a large diameter so that it can change its shape to a large diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1788184A JPS60164079A (en) | 1984-02-01 | 1984-02-01 | Valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1788184A JPS60164079A (en) | 1984-02-01 | 1984-02-01 | Valve device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60164079A true JPS60164079A (en) | 1985-08-27 |
Family
ID=11956037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1788184A Pending JPS60164079A (en) | 1984-02-01 | 1984-02-01 | Valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60164079A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665503A1 (en) * | 1990-08-03 | 1992-02-07 | Robinetterie Meca Ste Gle | Retention valve for circuits for circulating fluids under pressure |
| JPH11304026A (en) * | 1998-04-24 | 1999-11-05 | Mitsubishi Electric Corp | Air valve |
| EP1577594A1 (en) * | 2004-03-17 | 2005-09-21 | Hitachi Ltd. | Check valve |
| JP2011174515A (en) * | 2010-02-24 | 2011-09-08 | Sumitomo Metal Ind Ltd | Coil spring |
| US8783285B2 (en) * | 2008-02-05 | 2014-07-22 | The Boeing Company | Method and apparatus for a smart valve |
-
1984
- 1984-02-01 JP JP1788184A patent/JPS60164079A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2665503A1 (en) * | 1990-08-03 | 1992-02-07 | Robinetterie Meca Ste Gle | Retention valve for circuits for circulating fluids under pressure |
| JPH11304026A (en) * | 1998-04-24 | 1999-11-05 | Mitsubishi Electric Corp | Air valve |
| EP1577594A1 (en) * | 2004-03-17 | 2005-09-21 | Hitachi Ltd. | Check valve |
| US7367354B2 (en) | 2004-03-17 | 2008-05-06 | Hitachi, Ltd. | Check valve |
| US8783285B2 (en) * | 2008-02-05 | 2014-07-22 | The Boeing Company | Method and apparatus for a smart valve |
| US9488291B2 (en) | 2008-02-05 | 2016-11-08 | The Boeing Company | Method of draining an enclosure using a smart valve |
| JP2011174515A (en) * | 2010-02-24 | 2011-09-08 | Sumitomo Metal Ind Ltd | Coil spring |
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