JPH01234672A - Solenoid valve - Google Patents
Solenoid valveInfo
- Publication number
- JPH01234672A JPH01234672A JP5880988A JP5880988A JPH01234672A JP H01234672 A JPH01234672 A JP H01234672A JP 5880988 A JP5880988 A JP 5880988A JP 5880988 A JP5880988 A JP 5880988A JP H01234672 A JPH01234672 A JP H01234672A
- Authority
- JP
- Japan
- Prior art keywords
- plunger
- permanent magnet
- head
- valve body
- 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.)
- Pending
Links
- 230000004907 flux Effects 0.000 abstract description 21
- 230000005298 paramagnetic effect Effects 0.000 abstract 1
- 230000005291 magnetic effect Effects 0.000 description 36
- 239000007921 spray Substances 0.000 description 5
- 239000002907 paramagnetic material Substances 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 208000031872 Body Remains Diseases 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000005294 ferromagnetic effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】 （イ） 産業上の利用分野 この発明は、電磁弁に関するものである。[Detailed description of the invention] (b) Industrial application field The present invention relates to a solenoid valve.
（ロ） 従来の技術
従来、電磁弁の弁体を開閉作動させるには、主としてソ
レノイドが用いられており、同ソレノイドのコイルに通
電すると、同コイルに発生した磁力によりプランジャを
吸引して弁体を開作動させ、通電を断つと１ランジヤが
スプリングによって弁体が閉作動するように構成されて
いる。(b) Conventional technology Conventionally, a solenoid has been mainly used to open and close the valve body of a solenoid valve. When the coil of the solenoid is energized, the magnetic force generated in the coil attracts the plunger and closes the valve body. When the valve body is opened and the current is cut off, the valve body of the first plunger is configured to be closed by a spring.
そして、同ソレノイドのヘッドとは反対側のコイル端面
に角型の永久磁石を配設して、同磁石の磁力により、プ
ランジャをヘッド側又は、磁石側のいずれかに吸着させ
ることにより弁体の開閉状態を保持するようにしたもの
かある。A square permanent magnet is placed on the end of the coil on the side opposite to the head of the solenoid, and the magnetic force of the magnet attracts the plunger to either the head side or the magnet side. There are some that are designed to hold the open/closed state.
（ハ） 発明が解決しようとする問題点ところ力板永久
磁石が角型であるために、ソレノイドの外形を円形にし
ようとすれば外形か大き−くなり、また、プランジャと
永久磁石との間隙及び永久磁石からヘッドＩ＼の磁路を
形成する同ソレノイドのハウジングと永久磁石との間隙
が不均一となるため、同ハウジング内の磁束密度に粗密
か生じ、同ハウジング内に磁束密度の飽和部分が生じて
磁束の漏洩などのロスがあり、同磁石及びヘッドの１ラ
ンジャ吸着力が低下し、弁体の開閉状態保持か不確実に
なるという問題があった。(c) Problems to be solved by the invention However, since the force plate permanent magnet is square, if the outer shape of the solenoid is made circular, the outer shape will become larger, and the gap between the plunger and the permanent magnet will increase. Since the gap between the permanent magnet and the housing of the solenoid that forms the magnetic path from the permanent magnet to the head I\ becomes uneven, unevenness occurs in the magnetic flux density within the housing, and a saturated portion of magnetic flux density occurs within the housing. This causes losses such as leakage of magnetic flux, and the attraction force of the magnet and the head to the plunger decreases, making it uncertain whether the valve body will remain open or closed.
（ニ） 問題点を解決するための手段この発明では、
弁本体と、同弁本体に設けた弁座に臨む弁体を一端に設
ζＪなプランジャと、弁本体に固設されてプランジャの
他端を吸着・離間させるヘッドと、同ヘッドの外周に配
設したコイルと、プランジャの外周に設け、内外側で極
性を異にして着磁されたリング状の永久磁石よりなる電
磁弁を提供するものである。(d) Means for solving the problem In this invention,
A valve body, a plunger with a valve body facing the valve seat provided on the valve body at one end, a head fixed to the valve body to attract and separate the other end of the plunger, and a head disposed around the outer periphery of the head. The present invention provides an electromagnetic valve consisting of a ring-shaped permanent magnet, which is provided around the outer periphery of a plunger, and is magnetized with different polarities on the inside and outside.
（ホ） 作用・効果
この発明によれは、プランジャの外周に設すなリング状
の永久磁石によって、同プランジャとヘッドとの間に磁
路が形成されており、コイルに通電して、永久磁石と同
方向の磁力をヘッドに発生させると、１ランジヤがヘッ
ドに吸着されて同型磁弁を開作動させる。そして、」１
記通電を断っても、永久磁石の磁力によって、プランジ
ャはヘッドに吸着され続Ｃツるので同舟の開状態が保持
される。(E) Functions and Effects According to the present invention, a magnetic path is formed between the plunger and the head by a ring-shaped permanent magnet installed around the outer circumference of the plunger, and when the coil is energized, the permanent magnet is When a magnetic force in the same direction is generated in the head, the first langeer is attracted to the head and opens the same type magnetic valve. And,”1
Even if the power supply is cut off, the plunger is attracted to the head by the magnetic force of the permanent magnet, so that the open state of the boat is maintained.
また、コイルに上記とは逆方向に通電して、ヘッドを永
久磁石とは反対方向に励磁すると、プランジャが永久磁
石で励磁されているので、プランジャはヘッドから離間
し、電磁弁を閉弁さぜる。Also, when the coil is energized in the opposite direction to the above and the head is excited in the opposite direction to the permanent magnet, the plunger is moved away from the head and the solenoid valve is closed because the plunger is excited by the permanent magnet. Zeru.
そして、上記通電を断っても、プランジャが永久磁石に
吸引されているので、閉弁状態が保持される。Even if the energization is cut off, the plunger remains attracted to the permanent magnet, so the valve remains closed.
上記のように、弁体の開閉状態保持は、永久磁石の磁力
によるものであるが、同磁石をリング状に形成し、同リ
ング状の内外側で極性を異にして着磁しているので、同
磁石とプランジャ、同磁石とハウジンクとの間隙がそれ
ぞれ均一となり、磁束漏洩及び磁束飽和部分の発生等が
防止され、永久磁石の磁力がロスなくプランジャ及びヘ
ッドに伝ｗｌｉされて、同磁石及びヘッドのプランジャ
吸着力か高まり、弁体の開閉状態保持が確実になる。As mentioned above, the valve body is held open and closed by the magnetic force of the permanent magnet, which is formed into a ring shape and magnetized with different polarities on the inside and outside of the ring shape. , the gaps between the magnet and the plunger and between the magnet and the housing are made uniform, preventing magnetic flux leakage and occurrence of magnetic flux saturation, and the magnetic force of the permanent magnet is transmitted to the plunger and head without loss, allowing the magnet and the The plunger adsorption force of the head increases, ensuring that the valve body remains open and closed.
また、永久磁石内部の磁力線の方向か内側から外側方向
、又は、この反対方向となっているので磁力線を屈折さ
せずにプランジャ又はハウジングに伝達することかでき
、磁力線の屈折による磁力低下かなく、弁体の開閉状態
保持を更に確実なものとする効果がある。In addition, since the direction of the magnetic lines of force inside the permanent magnet is from the inside to the outside, or the opposite direction, the lines of magnetic force can be transmitted to the plunger or housing without being bent, and there is no decrease in magnetic force due to refraction of the lines of force. This has the effect of further ensuring that the valve body is kept open and closed.
（へ） 実施例
本発明の実施例を図面にもとづき詳説すれば、（＾）は
電磁弁を示しており、（１）は弁本体で、−端に流入口
（２）、他端に流出口（３）を設け、流入Ｄ（２）と流
出口（３）を連通させた流路（４）の中途に弁座（５）
を設けている。(v) Embodiment To explain the embodiment of the present invention in detail based on the drawings, (^) indicates a solenoid valve, (1) is the valve body, the - end has an inlet (2), and the other end has an inlet. A valve seat (5) is provided in the middle of the flow path (4) which has an outlet (3) and communicates the inlet D (2) and the outlet (3).
has been established.
（６）は弁本体（１）の上面に設けたフラックスプレー
１へであり、同プレート（６）の中心開口部が弁本体（
１）の上面に開口した連通Ｉ＋８（７）と連通しており
、フラックスプレート（６）と弁本体（１）との間にＯ
リング（８）を介装している。(6) is to the flux spray 1 provided on the top surface of the valve body (1), and the central opening of the plate (6) is the valve body (1).
It communicates with the communication I+8 (7) opened on the top surface of 1), and there is an O between the flux plate (6) and the valve body (1).
A ring (8) is inserted.
（９）は、フラックスプレート（６）の中心開口部に下
端を嵌着した案内筒であり、同案内筒（９）内には、常
磁性体よりなるプランジャ（１０）か上下摺動自在に挿
入され、同プランジャ（１０）の下端面には前記弁座（
５）と接離する弁体（１１）が嵌着している。(9) is a guide tube whose lower end is fitted into the central opening of the flux plate (6), and inside the guide tube (9) is a plunger (10) made of a paramagnetic material that can freely slide up and down. The valve seat (
5) and a valve body (11) that comes into contact with and separates from the valve body (11) is fitted.
また、案内筒（９）の」１端には、常磁性体よりなるヘ
ッド（１２）が嵌入固定されており、前記プランジャ（
１０）の上面に凹部（１３）を設りて、同凹部（１３）
にコイルスプリング（１４）を挿入し、同スプリング（
１４）の上端をヘッド（１２）の下面に当接させ、プラ
ンジャ（１０）を弁座（５）の方向に付勢させている。Further, a head (12) made of a paramagnetic material is fitted and fixed at one end of the guide tube (9), and the plunger (
10) A recess (13) is provided on the upper surface, and the recess (13)
Insert the coil spring (14) into the spring (
The upper end of the valve head (14) is brought into contact with the lower surface of the head (12) to urge the plunger (10) toward the valve seat (5).
また案内筒（９）の上端部外周には、内側と外側で極性
を異にして着磁されたリング状の永久磁石（１５）を外
嵌しており、同永久磁石（１５）の上面には、前記のフ
ラックスプレー＋１６）よりも薄肉のフラックスプレー
ト（１６）を重設し、同プレー１−［１６）の」１方に
コイル（１７）を配設している。In addition, a ring-shaped permanent magnet (15) magnetized with different polarities on the inside and outside is fitted on the outer periphery of the upper end of the guide tube (9). In this case, a flux plate (16) which is thinner than the above-mentioned flux spray +16) is overlaid, and a coil (17) is arranged on one side of the flux plate 1-[16].
また永久磁石（１５）の外周には常磁性体よりなる保護
カバー（１８）が嵌着しており、コイル（１７）上には
フラックスプレーー１〜（１９）を介して上面から常磁
性体よりなるハウジング（２０）が被嵌しており、同一
〇 −
ハウジング（２０）及びフラックスプレート（１９）を
挿貫したポル１〜（２１）により、ヘッド（１２）に螺
着固定されている。In addition, a protective cover (18) made of a paramagnetic material is fitted around the outer periphery of the permanent magnet (15), and the paramagnetic material is applied to the top surface of the coil (17) through flux sprays 1 to (19). It is fitted with a housing (20) made of the same material, and is screwed and fixed to the head (12) by holes 1 to (21) inserted through the housing (20) and flux plate (19).
従って、永久磁石（１５）から発生ずる磁力線はフラッ
クスプレー１〜（６）（１６）て集束され、保護カバー
（ｉａ）、ハウジンク（２０）、ヘッド（１２）、プ
ランジｗ （１０）を経て永久磁石（１５）に戻る磁路
が形成されており、１ランジヤ（１０）は、上下摺動自
在であるが、」１記磁力線の作用により、自由状態ては
、プランジャ（１０）の上端がヘッド（１２）の下面に
吸着された開弁状態と、同１ランジヤ（１０）の下端部
か永久磁石（１５）Ｉｌｌ！Ｉに吸着された閉状態の２
状態のいずれかに位置することになる。Therefore, the magnetic field lines generated from the permanent magnet (15) are focused by the flux sprays 1 to (6) (16), and are permanently transmitted through the protective cover (ia), the housing (20), the head (12), and the plunge w (10). A magnetic path is formed that returns to the magnet (15), and the plunger (10) is able to slide up and down. However, due to the action of the magnetic lines of force, the upper end of the plunger (10) is in the head when in the free state. The open state of the valve attracted to the lower surface of (12) and the lower end of the same 1st langeer (10) or the permanent magnet (15) Ill! 2 in closed state adsorbed to I
It will be located in one of the following states.
また、永久磁石（１５）は、リング状で、かつ、内外側
で極性を異にして着磁されたものであれはよく、例えば
、強磁性粉を焼結したもの、同強磁性粉をプラスデック
樹脂等で練り固めたもの、又はゴム等で練り固めて柔軟
性を持たせたものを用いることができ、特に、柔軟性を
付与した永久磁石では、案内筒（９）、保護カバー（１
Ｂ）及びフラッフ＝ ７ −−
スプレー＋（６）（１６）との密着性がよく、磁力線の
洩れが少く永久磁石の磁力が効果的に発揮されると共に
、棒状の同磁石を、リング状に曲げながら所定位置に取
付けることも可能であり、製造上も有利になる。The permanent magnet (15) may be ring-shaped and magnetized with different polarities on the inside and outside. For example, the permanent magnet (15) may be one made of sintered ferromagnetic powder, or a It is possible to use a material kneaded with deck resin or the like, or a material kneaded with rubber or the like to give it flexibility. In particular, in the case of a permanent magnet that has been given flexibility, the guide tube (9), the protective cover (1
B) and fluff = 7 -- Good adhesion with spray + (6) and (16), less leakage of magnetic lines of force and effective use of the magnetic force of the permanent magnet. It is also possible to attach it to a predetermined position while bending it, which is advantageous in terms of manufacturing.
次に、上記実施例の作用について説明する。Next, the operation of the above embodiment will be explained.
第１図は、閉弁時の状態を示し、コイル（１７）には通
電されておらず、永久磁石（１５）の磁力によりプラン
ジャ（１０）か下方に吸着されて、弁体（１１）で弁座
（５）を閉じている。Figure 1 shows the state when the valve is closed; the coil (17) is not energized, and the plunger (10) is attracted downward by the magnetic force of the permanent magnet (15), and the valve body (11) The valve seat (5) is closed.
なお、（［１）は永久磁石からの磁力線を示す。Note that ([1) indicates lines of magnetic force from the permanent magnet.
次いで、コイル（１７）に通電して、ヘッド（１２）を
永久磁石（１５）からの磁力線と同方向に励磁すると、
プランジャ（１０）の上端とヘッド（１２）の下端とが
相互に異極となり、コイルスプリング（１４）の付勢に
抗してヘッド（１２）がプランジャ（１０）を吸着して
、第２図で示すように弁座（５）を開かせる。Next, when the coil (17) is energized to excite the head (12) in the same direction as the lines of magnetic force from the permanent magnet (15),
The upper end of the plunger (10) and the lower end of the head (12) have different polarities, and the head (12) attracts the plunger (10) against the bias of the coil spring (14), as shown in FIG. Open the valve seat (5) as shown.
なお、（［２）はコイル（１７）で励磁されたヘッド（
１２）からの磁力線を示す。Note that ([2) is the head excited by the coil (17) (
12) shows the magnetic field lines from.
そして、上記の通電を断って、ヘッド（１２）のコイル
による励磁を中止しても、永久磁石（１５）からの磁力
線が保護カバー（１８）、ハウジング（２０）、フラッ
クスプレート（１９）を介してヘッド（１２）に達して
いるので上記のプランジャ（１０）吸着状態か保持され
、第３図で示すように電磁弁（八）は開弁状態を持続す
る。Even if the above-mentioned power supply is cut off and the excitation by the coil of the head (12) is stopped, the lines of magnetic force from the permanent magnet (15) will pass through the protective cover (18), the housing (20), and the flux plate (19). Since the plunger (10) reaches the head (12), the plunger (10) is maintained in the attracted state, and the solenoid valve (8) maintains the open state as shown in FIG.
次に、上記とは逆方向の電流をコイル（１７）に通電し
て、ヘッド（１２）を永久磁石（１５）からの磁力線（
［１）とは逆方向に励磁すると、同ヘッド（１２）の下
端とプランジャ（１０）上端とが相互に同極となり反発
し合って、プランジャ（１０）を弁座（５）の方向に離
間させて、第４図て示ずように弁座（５）を閉じさせる
。Next, a current in the opposite direction to the above is applied to the coil (17), and the head (12) is moved by the magnetic field lines (
When excited in the opposite direction to [1], the lower end of the head (12) and the upper end of the plunger (10) become the same polarity and repel each other, separating the plunger (10) toward the valve seat (5). Then, close the valve seat (5) as shown in Figure 4.
図中、（［３）はコイル（１７）で励磁されたヘッド（
１２）からの磁力線であり、永久磁石（１５）の磁力線
（［１）とは反対方向である。In the figure, ([3) is the head excited by the coil (17) (
12), which is in the opposite direction to the magnetic field lines ([1)] of the permanent magnet (15).
そして、この通電を停止しても、第１図で示すようにプ
ランジャ（１０）下端の弁体（１１）は、永久磁石（１
５）の吸引力とコイルスプリング（１４）の付勢とで弁
座（５）に押し付けられて、電磁弁（＾）は閉状態を持
続する。Even if this energization is stopped, the valve body (11) at the lower end of the plunger (10) is not connected to the permanent magnet (1), as shown in FIG.
The electromagnetic valve (^) is pressed against the valve seat (5) by the attraction force of step 5) and the urging force of the coil spring (14), so that the solenoid valve (^) maintains its closed state.
上記のように、弁体（１１）の開閉状態保持は、永久磁
石（１５）の磁力によるものであるが、同磁石（１５）
をリング状に形成し、同リング状の内外側で極性を異に
して着磁しているので、同磁石（１５）とプランジャ（
１０）、同磁石（１５）とハウジング（２０）との間隙
がそれぞれ均一となり、磁束漏洩及び磁束飽和部分の発
生等が防止され、永久磁石（１５）の磁力がロスなくプ
ランジャ（１０）及びヘッド（１７）に伝播されて、同
磁石（１５）及びヘッド（１７）のプランジャ吸着力が
高まり、弁体（１１）の開閉状態保持が確実になる。As mentioned above, the valve body (11) is maintained in the open/closed state by the magnetic force of the permanent magnet (15).
is formed into a ring shape and is magnetized with different polarities on the inside and outside of the ring shape, so the magnet (15) and plunger (
10) The gap between the magnet (15) and the housing (20) is uniform, preventing magnetic flux leakage and the occurrence of magnetic flux saturation, and the magnetic force of the permanent magnet (15) is transferred to the plunger (10) and the head without loss. (17), the plunger attraction force of the magnet (15) and the head (17) increases, and the valve body (11) is reliably maintained in the open/closed state.
また、永久磁石（１５）内部の磁力線の方向か内側から
外側方向、又は、この反対方向となっているので磁力線
を屈折させずに１ランジヤ（１０）又はハウジング（２
０）に伝達することができ、磁力線の屈折による磁力低
下かなく、弁体の開閉状態保持を更に確実なものとする
効果がある。In addition, since the direction of the magnetic lines of force inside the permanent magnet (15) is from the inside to the outside, or in the opposite direction, the 1 langeer (10) or the housing (2
0), there is no decrease in magnetic force due to refraction of lines of magnetic force, and there is an effect of more reliably maintaining the open/closed state of the valve body.
ＪＯ−JO-
第１図は、本発明による電磁弁の縦断面図（閉弁保持状
態）。
第２図は、同縦断面図（開弁作動状態）。
第３図は、同縦断面図（開弁保持状態）。
第４図は、同縦断面図（閉弁作動状態）。
（１）：弁本体
（５）：弁座
（１０） ニブランジャ
（１２） ：ヘッド
［１５） ：永久磁石
（１７） ：コイルFIG. 1 is a longitudinal cross-sectional view of the solenoid valve according to the present invention (valve closed state). FIG. 2 is a longitudinal cross-sectional view of the same (valve opening operation state). FIG. 3 is a longitudinal cross-sectional view of the same (in a state in which the valve is held open). FIG. 4 is a longitudinal cross-sectional view of the same (valve closed state). (1): Valve body (5): Valve seat (10) Nib plunger (12): Head [15): Permanent magnet (17): Coil
Claims (1)
）に臨む弁体（１１）を一端に設けたプランジャ（１０
）と、弁本体（１）に固設されてプランジャ（１０）の
他端を吸着・離間させるヘッド（１２）と、同ヘッド（
１２）の外周に配設したコイル（１７）と、プランジャ
（１０）の外周に設け、内外側で極性を異にして着磁さ
れたリング状の永久磁石（１５）よりなる電磁弁。1) Valve body (1) and valve seat (5) provided on the valve body (1)
) with a plunger (10) provided at one end with a valve body (11) facing the
), a head (12) which is fixed to the valve body (1) and which attracts and separates the other end of the plunger (10), and the head (
12); and a ring-shaped permanent magnet (15) provided on the outer periphery of the plunger (10) and magnetized with different polarities on the inside and outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5880988A JPH01234672A (en) | 1988-03-11 | 1988-03-11 | Solenoid valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5880988A JPH01234672A (en) | 1988-03-11 | 1988-03-11 | Solenoid valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01234672A true JPH01234672A (en) | 1989-09-19 |
Family
ID=13094931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5880988A Pending JPH01234672A (en) | 1988-03-11 | 1988-03-11 | Solenoid valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01234672A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5584466A (en) * | 1993-10-21 | 1996-12-17 | Smc Corporation | Self-holding type solenoid valves |
| US6129115A (en) * | 1999-07-02 | 2000-10-10 | Mac Valves, Inc. | Self-latching solenoid valve assembly |
| US6483688B1 (en) | 2000-07-12 | 2002-11-19 | Mac Valves, Inc. | Control circuit for solenoid valve assembly |
| EP1790782A1 (en) * | 2005-11-23 | 2007-05-30 | Innoplast S.r.L. | Water level control valve comprising a paramagnetic shutter |
| JP2015094413A (en) * | 2013-11-11 | 2015-05-18 | 日本電産トーソク株式会社 | Electromagnetic valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60215176A (en) * | 1984-04-09 | 1985-10-28 | Matsushita Electric Ind Co Ltd | Self-sustaining type gas shut-off valve |
-
1988
- 1988-03-11 JP JP5880988A patent/JPH01234672A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60215176A (en) * | 1984-04-09 | 1985-10-28 | Matsushita Electric Ind Co Ltd | Self-sustaining type gas shut-off valve |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5584466A (en) * | 1993-10-21 | 1996-12-17 | Smc Corporation | Self-holding type solenoid valves |
| US6129115A (en) * | 1999-07-02 | 2000-10-10 | Mac Valves, Inc. | Self-latching solenoid valve assembly |
| US6483688B1 (en) | 2000-07-12 | 2002-11-19 | Mac Valves, Inc. | Control circuit for solenoid valve assembly |
| EP1790782A1 (en) * | 2005-11-23 | 2007-05-30 | Innoplast S.r.L. | Water level control valve comprising a paramagnetic shutter |
| JP2015094413A (en) * | 2013-11-11 | 2015-05-18 | 日本電産トーソク株式会社 | Electromagnetic valve |
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