JPH0234529Y2 - - Google Patents
Info
- Publication number
- JPH0234529Y2 JPH0234529Y2 JP560983U JP560983U JPH0234529Y2 JP H0234529 Y2 JPH0234529 Y2 JP H0234529Y2 JP 560983 U JP560983 U JP 560983U JP 560983 U JP560983 U JP 560983U JP H0234529 Y2 JPH0234529 Y2 JP H0234529Y2
- Authority
- JP
- Japan
- Prior art keywords
- fluid
- flapper
- valve
- opening
- inner cylinder
- 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
Links
- 239000012530 fluid Substances 0.000 claims description 28
- 238000005192 partition Methods 0.000 claims description 6
- 230000005484 gravity Effects 0.000 claims description 2
- 238000001816 cooling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 230000002265 prevention Effects 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Safety Valves (AREA)
- Check Valves (AREA)
Description
【考案の詳細な説明】
この考案は改良された過圧阻止弁の構造に関す
る。過圧阻止弁はその動作時に繰り返しての開閉
動作、いわゆるハンチングをしないことが望まれ
る。DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improved overpressure check valve structure. It is desirable that the overpressure check valve does not repeatedly open and close, or so-called hunting, during its operation.
変圧器等の電器においてはその負荷に応じて損
失熱を発生する。この損失熱を発散させるために
放熱器を使用するが、その際負荷が小さいときは
放熱器を自冷式として使用し、負荷が大きくなる
と送油式として油速を上げ同一放熱器の冷却効率
を上げて使用する。この場合に放熱器をたとえば
２群に分ける管路を形成して、自冷時にはそれぞ
れの放熱器を並列に使用し、送油時には放熱器を
直列に使用して一層油速を上げることが行なわれ
る。この管路の自動切り換えに過圧阻止弁、すな
わち所定の流速未満では弁の二つの開口のいずれ
の方向への流体の通過も許容し、所定の一方向の
流れが前記所定の流速に達したときにその通過を
妨げる弁が使用される。 Electrical appliances such as transformers generate heat loss depending on their load. A radiator is used to dissipate this lost heat, but when the load is small, the radiator is used as a self-cooling type, and when the load becomes large, the radiator is used as an oil feed type, increasing the oil speed and increasing the cooling efficiency of the same radiator. Raise and use. In this case, for example, a conduit is formed to divide the radiators into two groups, and each radiator is used in parallel during self-cooling, and the radiators are used in series during oil supply to further increase the oil speed. It can be done. Automatic switching of this line is provided with an overpressure check valve, i.e., below a predetermined flow rate, fluid is allowed to pass in either direction through the two openings of the valve, and the flow in one predetermined direction reaches said predetermined flow rate. Sometimes a valve is used to prevent its passage.
第１図は変圧器タンク１内の油の冷却に少なく
とも２個の放熱器２と２個の過圧阻止弁３ａと３
ｂとを使用した例で、図示のように自冷時の油の
流速が小さいときは過圧阻止弁３ａ，３ｂ内を点
線矢印で示す方向に油が二つの放熱器２内を並流
する。しかし送油ポンプ４が動作するとその流速
によつて過圧阻止弁３ａ，３ｂ内のフラツパ５が
閉じられて実線で示すように二つの放熱器２を直
列に油が流れ冷却効率を上げる。 Figure 1 shows that at least two radiators 2 and two overpressure check valves 3a and 3 are used to cool the oil in the transformer tank 1.
In this example, when the flow rate of oil during self-cooling is low as shown in the figure, oil flows in parallel inside the two radiators 2 in the direction shown by the dotted arrows inside the overpressure check valves 3a and 3b. . However, when the oil feed pump 4 operates, the flapper 5 in the overpressure check valves 3a, 3b is closed by the flow rate, and oil flows in series through the two radiators 2 as shown by the solid line, increasing cooling efficiency.
第２図は常時矢印方向に油が流れている従来の
過圧阻止弁３の構造図で管路を形成する導油管２
８の軸方向両端に開口２０を有するフランジ２１
を胴板２２で連結した弁ケース２３と、弁ケース
２３内に内筒２４を備える。内筒２４はその軸方
向の一方端が前記一方のフランジ２１にその開口
２０部において溶接等により固着され、開口した
他方の先端が下部ほど前記固着部に近付くように
斜に形成されている。 Figure 2 is a structural diagram of a conventional overpressure check valve 3 in which oil always flows in the direction of the arrow.
A flange 21 having openings 20 at both axial ends of 8.
The valve case 23 includes a valve case 23 connected by a body plate 22, and an inner cylinder 24 inside the valve case 23. One end of the inner cylinder 24 in the axial direction is fixed to the one flange 21 at the opening 20 by welding or the like, and the other open end is formed obliquely so that the lower the part, the closer the inner cylinder 24 is to the fixed part.
その他、その下部が内筒先端部の最下部付近に
おいてピン２５によつて回動自在に支持され、常
時は内筒２４の先端部と間隔をあけて離れ受け金
具２６によつて支持され、矢印と反対方向に流れ
る逆流時にはその逆流により回動され、内筒先端
部を閉塞するフラツパ２７が設けられている。そ
して過圧阻止弁３はフランジ２１に適合するフラ
ンジをもつた導油管２８に接続されている。 In addition, its lower part is rotatably supported by a pin 25 near the bottom of the tip of the inner cylinder 24, and is normally supported by a receiving metal fitting 26 spaced apart from the tip of the inner cylinder 24. A flapper 27 is provided which is rotated by the reverse flow and closes the tip of the inner cylinder when the reverse flow flows in the opposite direction. The overpressure check valve 3 is connected to an oil guide pipe 28 having a flange that matches the flange 21.
第３図は前記逆流時（第１図において送油ポン
プ４が動作）の状態を示す過圧阻止弁３の構造図
で、この時図示しない送油ポンプより吐出した油
の油圧による油流３１によりフラツパ２７は自重
に抗して回動されて内筒２４の先端を閉塞する。
しかしこの瞬間にフラツパ２７により内筒２４内
の油圧が高まる。この圧力はやがて図のように反
射波３２となつて内筒２４側に戻つてくる。この
結果フラツパ２７はこの反射波３２によつて開
く、さらにこの現象により内筒２４内の圧力は減
少するため再び送油ポンプの圧力によりフラツパ
２７が閉じられ、フラツパ２７が閉じられると前
述と同様にまた内筒２４内の圧力が高まり前述と
同様ないわゆるハンチングが起り、かなり長い間
開閉を繰り返して騒音を発したり、長く油に動揺
を与えたりする欠点があつた。 FIG. 3 is a structural diagram of the overpressure check valve 3 showing the state at the time of reverse flow (the oil feed pump 4 is in operation in FIG. 1). As a result, the flapper 27 is rotated against its own weight and closes the tip of the inner cylinder 24.
However, at this moment, the hydraulic pressure inside the inner cylinder 24 increases due to the flapper 27. This pressure eventually returns to the inner cylinder 24 side as a reflected wave 32 as shown in the figure. As a result, the flapper 27 is opened by this reflected wave 32, and since the pressure inside the inner cylinder 24 decreases due to this phenomenon, the flapper 27 is closed again by the pressure of the oil pump, and when the flapper 27 is closed, it is the same as described above. Moreover, the pressure inside the inner cylinder 24 increases, causing so-called hunting similar to that described above, which has the drawback of repeatedly opening and closing for quite a long time, producing noise and causing agitation in the oil for a long time.
この考案は従来のこれらの欠点を除き、ハンチ
ングを起こさない過圧阻止弁を提供することを目
的とする。この目的はこの考案によれば次のよう
に構成することにより達成された。 The object of this invention is to eliminate these conventional drawbacks and provide an overpressure check valve that does not cause hunting. According to this invention, this object was achieved by the following configuration.
すなわち、流体の管略に挿入される弁であつ
て、軸方向に一方と他方の二つの開口を備えた弁
ケース内に内筒とフラツパとを有し、所定の流速
未満ではいずれの前記開口方向への流体の通過も
許容し、所定の一方向の流れが前記所定の流速に
達した際にその通過を妨げる過圧阻止弁を次のよ
うに構成する。内筒の前記一方の開口に近い軸方
向一方端は流体の通過を妨げる閉塞された盲板を
設け他方端は前記他方の開口部に開口するととも
に軸方向に直交する方向で前記盲板側に位置する
円筒の側面に流体流通口を備え、前記フラツパは
前記一方の開口からの流体の流入進路を直交する
方向に軸心を有する回動軸に固着されこの流入進
路に対向する受圧板およびこの受圧板の回動によ
り前記内筒の流体流通口を覆う仕切板とで構成す
る。またフラツパの回動角度を制限する制限体を
備える。すなわち、従来はフラツパにより流体の
流れを阻止した場合にそれによつて生ずる反射波
をフラツパが開く方向に受けていたがこの考案に
よれば反射波をフラツパの開く方向と直角方向に
受けて反射波によるフラツパへの回転力をなくし
た。 That is, the valve is inserted into a fluid pipe, and has an inner cylinder and a flapper inside a valve case that has two openings in the axial direction, one opening and the other opening. An overpressure prevention valve that also allows fluid to pass in this direction and prevents the passage of fluid when the flow in a predetermined one direction reaches the predetermined flow velocity is configured as follows. One axial end of the inner cylinder close to the one opening is provided with a closed blind plate that prevents the passage of fluid, and the other end is open to the other opening and faces the blind plate in a direction perpendicular to the axial direction. A fluid communication port is provided on the side surface of the cylinder in which the flapper is located, and the flapper is fixed to a rotating shaft having an axis perpendicular to the inflow path of the fluid from the one opening, and a pressure receiving plate facing the inflow path and this and a partition plate that covers the fluid flow port of the inner cylinder by rotating the pressure receiving plate. It also includes a limiter that limits the rotation angle of the flapper. In other words, conventionally, when the flow of fluid is blocked by a flapper, the reflected wave generated by the flapper is received in the direction in which the flapper opens, but with this invention, the reflected wave is received in a direction perpendicular to the direction in which the flapper opens, and the reflected wave is received. Eliminates the rotational force applied to the flats.
第４図および第５図はこの考案実施例の過圧阻
止弁４１の構造図である。過圧阻止弁４１は弁ケ
ース２３と弁ケース内に収納された内筒４２とフ
ラツパ４３とを備える。弁ケース２３はその軸方
向両端にそれぞれ開口２０を有するフランジ２１
ａ，２１ｂを胴板２２で密に連結してなり、この
フランジに適合するフランジをもつた導油管２８
に着脱自在に取り付けられる。内筒４２は一方の
軸方向先端部は下部ほど他方のフランジ２１ｂを
近付くように斜に形成した筒体４４とその先端部
を盲板４５で閉塞してなり他方の軸方向先端は他
方のフランジ２１ｂの開口２０部に開口して他方
のフランジ２１ｂに固着され、内筒の盲板４５の
側で、軸方向に直交する方向に位置する円筒の両
側面に開口した流体流通口４６が設けられてい
る。 4 and 5 are structural diagrams of the overpressure check valve 41 according to this embodiment of the invention. The overpressure check valve 41 includes a valve case 23, an inner cylinder 42 housed within the valve case, and a flapper 43. The valve case 23 has flanges 21 each having openings 20 at both ends in the axial direction.
a, 21b are closely connected by a body plate 22, and an oil guide pipe 28 has a flange that fits this flange.
It can be detachably attached to. The inner cylinder 42 has a cylinder body 44 formed obliquely so that the other flange 21b approaches the lower part at one axial end, and a blind plate 45 closing that end. 21b, and is fixed to the other flange 21b, and on the side of the blind plate 45 of the inner cylinder, a fluid communication port 46 is provided that opens on both sides of the cylinder located in a direction perpendicular to the axial direction. ing.
フラツパ４３はその動作時に内筒４２の盲板４
５部に当接してその回動を止める受圧板４７と、
流体流通口４６を密に覆う両側板４８とからなる
仕切板５０と仕切板の端部に設けられた回動軸５
１とからなる。そして回動軸５１は内筒４２の一
方の先端の大地側に水平配置されるとともにフラ
ツパ４３が動作した際にもその重心が回動軸５１
の軸心を含む鉛直面より一方のフランジ２１ａ側
にあるよう内筒４２に固着されたヒンジ支え５２
に支持される。さらにヒンジ支え５２は回動軸５
１の軸心が一方のフランジ２１ａの開口２０から
の流体の流入進路５３と直交するよう固着され
る。 The flapper 43 closes the blind plate 4 of the inner cylinder 42 during its operation.
a pressure receiving plate 47 that comes into contact with the fifth part and stops its rotation;
A partition plate 50 consisting of both side plates 48 that tightly cover the fluid flow port 46, and a rotation shaft 5 provided at the end of the partition plate.
Consists of 1. The rotation shaft 51 is horizontally arranged on the ground side of one end of the inner cylinder 42, and even when the flapper 43 operates, its center of gravity remains on the rotation shaft 51.
A hinge support 52 fixed to the inner cylinder 42 so as to be located on one flange 21a side from a vertical plane including the axis of the
Supported by Furthermore, the hinge support 52 is
The axial center of the flange 21a is fixed so as to be perpendicular to the inflow path 53 of the fluid from the opening 20 of the flange 21a.
また仕切板５０の側板４８と筒状体４４の側板
４４ａおよび受圧板４７の側方端との間は滑動し
得る程度の小間隙とするか、あるいは筒状体４４
および受圧板４７の側方端か側板４４ａのいずれ
かに図示しない弾性材を貼つて両者を流体密に滑
動させてもよい。そのほかフラツパ４３が動作し
ないときにその一方のフランジ２１ａ側への回動
角度を制限する制限体５４が備えられている。 Also, between the side plate 48 of the partition plate 50, the side plate 44a of the cylindrical body 44, and the side end of the pressure receiving plate 47, a small gap is provided to allow sliding, or the cylindrical body 44
Alternatively, an elastic material (not shown) may be attached to either the side end of the pressure receiving plate 47 or the side plate 44a to allow the two to slide in a fluid-tight manner. In addition, a limiter 54 is provided that limits the angle of rotation of the flapper 43 toward one flange 21a when the flapper 43 does not operate.
内筒４２の流体流通口４６をフラツパ４３によ
り閉塞すべき進入路５３からの流体速度が一定の
場合は制限体５４は一定すなわち受圧板４７の傾
きは一定でよい。しかし実際は配管の状態によつ
て前記進入流体速度が異なり過圧阻止弁の動作時
期が異なり不都合を来たすことが多いので受圧板
４７の傾きを調整してその動作を合わせることが
望ましい。第６図はその実施例図で弁ケース２３
にめねじ６１とこのめねじに螺合し先端が受圧板
４７の下面に当接して一方のフランジ２１ａ方向
への回動角度を制限し得るおねじ棒６２を設け
る。めねじ６１と受圧板４７との間のおねじ棒６
２の長さを加減することにより受圧板４７の傾き
を調整する。すなわち、めねじ６１と受圧板４７
との間のおねじ棒６２の長さを長くして受圧板４
７の水平よりの傾きθを大きくすれば進入流体の
速度が小さくてもフラツパ４３は動作し、傾きθ
を小さくすれば進入流体の速度は大きくなる。な
お、おねじ棒６２の調整は図示のように外部から
なし得ることが望ましいが必ずしもその要はな
い。 When the fluid velocity from the inlet passage 53 to close the fluid communication port 46 of the inner cylinder 42 by the flapper 43 is constant, the limiter 54 may be constant, that is, the inclination of the pressure receiving plate 47 may be constant. However, in reality, the speed of the incoming fluid varies depending on the state of the piping, and the operation timing of the overpressure check valve varies, which often causes inconvenience, so it is desirable to adjust the inclination of the pressure receiving plate 47 to match its operation. Figure 6 is an example diagram of the valve case 23.
A male threaded rod 62 is provided which is screwed into the female thread 61 and whose tip abuts against the lower surface of the pressure receiving plate 47 to limit the rotation angle in the direction of one flange 21a. Male threaded rod 6 between female thread 61 and pressure receiving plate 47
The inclination of the pressure receiving plate 47 is adjusted by adjusting the length of the pressure receiving plate 47. That is, the female thread 61 and the pressure receiving plate 47
Pressure receiving plate 4 by increasing the length of male threaded rod 62 between
If the inclination θ from the horizontal of 7 is increased, the flapper 43 will operate even if the velocity of the incoming fluid is small, and the inclination θ
If , the velocity of the incoming fluid increases. Although it is desirable that the male threaded rod 62 can be adjusted from the outside as shown in the figure, it is not necessary.
さらに簡単な制限体として第６図に鎖線で示す
ように可撓紐状体６３の一端をフラツパ４３に固
定し、他端を弁ケース２３内、例えば内筒４２に
設けたピン６４にその長さを調整可能に固定して
もよい。 As a further simple limiter, one end of the flexible string-like body 63 is fixed to the flapper 43 as shown by the chain line in FIG. The height may be fixed and adjustable.
過圧阻止弁４１を以上のように構成することに
より、流体の流速が所定値未満のときはフラツパ
４３が静止しているため流体は過圧阻止弁４１内
をそのいずれの軸方向にも通過し得る。しかし一
方のフランジ２１ａの開口２０からの流速が所定
値に達すればフラツパ４３が動作して内筒の流体
流通口４６を閉塞する。しかしこの後にやつてく
る反射波はフラツパ４３の側板４８に作用するだ
けでフラツパ４３の回転力として作用しないから
従来のようにハンチングを起すことはない。一旦
フラツパ４３が動作するとフラツパはその内外の
圧力差によつてその閉塞状態を保つ。送油ポンプ
の運転を中止すればフラツパ４３内外の圧力差が
なくなりフラツパ４３はその自重によりもとに戻
る。 By configuring the overpressure check valve 41 as described above, when the fluid flow velocity is less than a predetermined value, the flapper 43 is stationary, so fluid passes through the overpressure check valve 41 in either axial direction. It is possible. However, when the flow velocity from the opening 20 of one flange 21a reaches a predetermined value, the flapper 43 operates to close the fluid communication port 46 of the inner cylinder. However, since the reflected waves that come after this only act on the side plate 48 of the flapper 43 and do not act as a rotational force on the flapper 43, hunting does not occur as in the conventional case. Once the flapper 43 is activated, the flapper maintains its closed state due to the pressure difference between the inside and outside of the flapper. When the operation of the oil pump is stopped, the pressure difference between the inside and outside of the flapper 43 disappears, and the flapper 43 returns to its original state due to its own weight.
以上の説明で明らかなように、この考案の構成
によれば従来の欠点を途きハンチングのない過圧
阻止装置を得ることができる。 As is clear from the above description, according to the configuration of this invention, it is possible to overcome the conventional drawbacks and obtain an overpressure prevention device free from hunting.
第１図は過圧阻止弁の使用例管路図、第２図お
よび第３図は従来の過圧阻止弁のそれぞれ常時お
よび動作時の断面側面図、第４図および第５図は
それぞれこの考案実施例の断面側面図および第４
図のＡ−Ａ部断面正面図、第６図は第４図と異な
る制限体をもつたこの考案実施例の断面側面図で
ある。
２０：開口、２３：弁ケース、２８：管路、４
１：過圧阻止弁、４２：内筒、４３：フラツパ、
４６：流体流通口、４７：受圧板、５０：仕切
板、５１：回動軸、５３：一方の流入進路、５
４：制限体、６１：めねじ、６２：おねじ棒、６
３：可撓紐体。
Fig. 1 is a pipe diagram showing an example of the use of an overpressure check valve, Figs. 2 and 3 are sectional side views of a conventional overpressure check valve during normal operation and operation, respectively, and Figs. 4 and 5 are respectively sectional side views of the conventional overpressure check valve. Cross-sectional side view of the invented embodiment and the fourth
6 is a cross-sectional front view taken along the line A--A in the figure, and FIG. 6 is a cross-sectional side view of an embodiment of this invention having a restricting body different from that in FIG. 4. 20: Opening, 23: Valve case, 28: Pipe line, 4
1: Overpressure check valve, 42: Inner cylinder, 43: Flat flap,
46: Fluid flow port, 47: Pressure receiving plate, 50: Partition plate, 51: Rotating shaft, 53: One inflow course, 5
4: Limiting body, 61: Female thread, 62: Male thread rod, 6
3: Flexible string.
Claims (1)
路を形成する導油管の軸方向に一方と他方の二
つの開口を備えた弁ケース内に内筒とフラツパ
とを有し、所定の流速未満ではいずれの前記開
口方向への流体の通過も許容し、所定の一方向
の流れが前記所定の流速に達した際にその通過
を妨げる過圧阻止弁において、前記内筒の前記
一方の開口に近い軸方向一方端は流体の通過を
妨げる閉塞された盲板を設け他方端は前記他方
の開口部に開口するとともに軸方向に直交する
方向で前記盲板側に位置する内筒の側面に流体
流通口を備え、前記フラツパは前記一方の開口
からの流体の流入進路と直交する方向に軸心を
有する回動軸に固着されこの流入進路に対向す
る受圧板およびこの受圧板の回動により前記内
筒の流体流通口を覆う仕切板を備えてなり、ま
たフラツパの回動角度を制限する制限体が備え
られたことを特徴とする過圧阻止弁。 ２ 実用新案登録請求の範囲第１項記載の弁にお
いて、制限体が弁ケースに設けられためねじ
と、このめねじに螺合し回動されて先端が受圧
板の下面に当接するおねじ棒とを備えたことを
特徴とする過圧阻止弁。 ３ 実用新案登録請求の範囲第１項記載の弁にお
いて、制限体が一端部をフラツパに、また他端
部を弁ケース内にその長さを調整可能に固定し
た可撓紐状体であることを特徴とする過圧阻止
弁。 ４ 実用新案登録請求の範囲第１項記載の弁にお
いて、回動軸が大地側に水平配置されるととも
にフラツパの重心が常に回動軸の軸を含む鉛直
面より一方の開口側にあることを特徴とする過
圧阻止弁。[Claims for Utility Model Registration] 1. A valve inserted into a fluid pipeline, which has an inner cylinder inside a valve case having two openings, one opening and the other opening, in the axial direction of an oil guide pipe forming the pipeline. and a flapper, which allows fluid to pass in any of the opening directions below a predetermined flow rate, and blocks the passage of fluid in one direction when the flow reaches the predetermined flow rate. In this case, one axial end of the inner cylinder close to the one opening is provided with a closed blind plate that prevents passage of fluid, and the other end is open to the other opening and the blind plate is closed in a direction perpendicular to the axial direction. A fluid communication port is provided on the side surface of the inner cylinder located on the plate side, and the flapper is fixed to a rotating shaft having an axis perpendicular to the inflow path of the fluid from the one opening, and faces the inflow path. An overpressure check valve comprising a pressure receiving plate and a partition plate that covers the fluid flow port of the inner cylinder by rotation of the pressure receiving plate, and a restriction body that limits the rotation angle of the flapper. . 2. In the valve described in claim 1 of the claims for utility model registration, the limiter is provided in the valve case and has a female thread, and a male thread rod that is screwed into the female thread and rotated so that its tip abuts the lower surface of the pressure receiving plate. An overpressure check valve comprising: 3. In the valve described in claim 1 of the utility model registration claim, the limiter is a flexible string-like body with one end fixed to a flap and the other end fixed in the valve case so that its length can be adjusted. An overpressure check valve featuring: 4. In the valve set forth in claim 1 of the utility model registration claim, the rotating shaft is arranged horizontally on the ground side, and the center of gravity of the flapper is always on one opening side with respect to the vertical plane containing the axis of the rotating shaft. Features: Overpressure check valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP560983U JPS59112073U (en) | 1983-01-19 | 1983-01-19 | Overpressure check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP560983U JPS59112073U (en) | 1983-01-19 | 1983-01-19 | Overpressure check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59112073U JPS59112073U (en) | 1984-07-28 |
| JPH0234529Y2 true JPH0234529Y2 (en) | 1990-09-17 |
Family
ID=30137197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP560983U Granted JPS59112073U (en) | 1983-01-19 | 1983-01-19 | Overpressure check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59112073U (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH701035A1 (en) * | 2009-05-14 | 2010-11-15 | Rico Sicherheitstechnik Ag | Explosion protection valve for interrupting a fluid flow in a pipeline. |
| JP5780419B2 (en) * | 2011-05-31 | 2015-09-16 | アイシン精機株式会社 | Oil supply device |
| JP6192103B2 (en) * | 2013-08-19 | 2017-09-06 | 四国電力株式会社 | Water tank, flap gate and gate weir |
-
1983
- 1983-01-19 JP JP560983U patent/JPS59112073U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59112073U (en) | 1984-07-28 |
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