JP3374190B2 - Check valves and insulated containers - Google Patents
Check valves and insulated containersInfo
- Publication number
- JP3374190B2 JP3374190B2 JP12729698A JP12729698A JP3374190B2 JP 3374190 B2 JP3374190 B2 JP 3374190B2 JP 12729698 A JP12729698 A JP 12729698A JP 12729698 A JP12729698 A JP 12729698A JP 3374190 B2 JP3374190 B2 JP 3374190B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- mounting base
- base member
- check valve
- hole
- 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 - Fee Related
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
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/04—Arrangements using dry fillers, e.g. using slag wool which is added to the object to be insulated by pouring, spreading, spraying or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Packages (AREA)
- Thermal Insulation (AREA)
- Self-Closing Valves And Venting Or Aerating Valves (AREA)
- Check Valves (AREA)
- Safety Valves (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、弁部材両側の圧力
差によって開弁して１方向の流通のみを可能にする逆止
弁とこの逆止弁を備えた断熱コンテナに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve that opens due to a pressure difference between both sides of a valve member and allows only one-way flow, and a heat insulating container provided with this check valve.
【０００２】[0002]
【従来の技術】従来より、食材等を運搬するための合成
樹脂よりなるコンテナ（通函）にあっては、保温、保冷
状態の維持が良好となるように、その壁体構造として、
非発泡の合成樹脂の成形体よりなる内装体と外装体との
間に合成樹脂発泡体等の芯材を断熱層として介装した構
造が採用されている。2. Description of the Related Art Conventionally, in a container (box) made of synthetic resin for transporting foodstuffs, etc., as its wall structure, in order to maintain a good heat retention and cold insulation,
A structure in which a core material such as synthetic resin foam is interposed as an adiabatic layer between an inner body and an outer body made of a non-foamed synthetic resin molded body is adopted.
【０００３】このコンテナは衛生上の必要から水洗およ
び熱湯消毒等が頻繁に行なわれる。そのため、水が内装
体と外装体との間に入らないように、内装体と外装体と
の接合部を熱可塑性樹脂による溶接によって閉塞し、一
体性を向上させたもの（例えば５９−１１０９８号）が
提案されている。This container is frequently washed with water and sterilized with hot water for hygiene needs. Therefore, in order to prevent water from entering between the inner body and the outer body, the joint between the inner body and the outer body is closed by welding with a thermoplastic resin to improve the integrity (for example, 59-11098). ) Is proposed.
【０００４】このような断熱コンテナの場合、前記の接
合は減圧下で行なわれが、コンテナ壁体の内装体と内装
体との間の断熱層の部分に空気が残ることは避けられ
ず、またその後のガス透過やコンテナ使用時の多段の積
み重ねによって荷重負担による変形等も影響して、コン
テナ内に熱いご飯等を収容した場合、内装体の合成樹脂
が熱によって若干柔らかくなり、上記の残留空気の膨脹
によって、内装体が内方へ膨れて変形が生じる場合があ
る。In the case of such a heat-insulating container, the above-mentioned joining is carried out under reduced pressure, but it is unavoidable that air remains in the heat insulating layer between the interior of the container wall and the interior. When gas such as hot rice is stored in the container due to subsequent gas permeation and multi-stage stacking when using the container, deformation due to load, etc. will also cause the synthetic resin of the interior to soften slightly due to heat, and the residual air above Due to the expansion, the inner body may swell inward and be deformed.
【０００５】これを防止するために、実開平３−４３４
８０号公報に見られるように、内装体と外装体との対応
位置に係合部を設けて周面の変形を防止した断熱コンテ
ナが提案されている。しかしながら、部分的に係合部を
設けた内装体、外装体を一体成形するには複雑な成形型
が必要であり、このような成形型は高価であるためコス
ト高を招く。また部分的に係合する部品を内装体、外装
体とは別に作成して接合することも可能であるが、これ
も工程数が増えコスト高につながる。In order to prevent this, an actual flat opening 3-434
As seen in Japanese Patent Laid-Open No. 80, a heat insulating container has been proposed in which engaging portions are provided at corresponding positions of the inner body and the outer body to prevent deformation of the peripheral surface. However, a complicated molding die is required to integrally mold the inner body and the outer body partially provided with the engaging portions, and such a molding die is expensive, resulting in high cost. It is also possible to create and join the partially engaging parts separately from the inner body and the outer body, but this also increases the number of steps and leads to high cost.
【０００６】一方、最近では、これらの断熱コンテナに
熱いご飯等を収容した後、真空冷却によって最適な温度
まで急速に冷してその温度で保温するという使用方法が
採られている。On the other hand, recently, a method of use has been adopted in which hot rice or the like is stored in these heat-insulating containers and then rapidly cooled to an optimum temperature by vacuum cooling and kept at that temperature.
【０００７】例えば、寿司用飯では、最適な使用温度は
４０〜４５℃と言われており、断熱コンテナに炊き立て
の熱いご飯（９５℃）をほぐして収容し（８５℃）、
酢、調味料等を合せて混ぜた後（７５℃）、真空冷却に
よって短時間の内に４０〜４５℃に冷却し、その後この
温度に保温して輸送、供給することが行なわれている。
また五目飯やかやく飯及び白御飯は、通常さらに低温の
２０〜２５℃で位まで急速に冷却した後、輸送、供給さ
れている。For example, for sushi rice, the optimum operating temperature is said to be 40 to 45 ° C., and hot rice (95 ° C.) freshly cooked is unraveled and stored (85 ° C.) in an insulating container.
After vinegar, seasonings and the like are mixed together (75 ° C.), they are cooled to 40 to 45 ° C. within a short time by vacuum cooling, and then kept at this temperature and transported and supplied.
In addition, Gomoku rice, kayak rice and white rice are usually transported and supplied after being rapidly cooled to a low temperature of 20 to 25 ° C.
【０００８】この真空冷却では大気から２０〜４０ｍｍ
Ｈｇ程度まで急激に減圧するが、熱いご飯等を収容した
コンテナ内部の内装体の合成樹脂が熱によって若干柔ら
かくなっている状態で、このような急激な減圧を行なう
と、内装体、特にその底部が内方へ膨れるという問題が
生じる場合がある。With this vacuum cooling, 20 to 40 mm from the atmosphere
Although the pressure is rapidly reduced to about Hg, when such a rapid pressure reduction is performed while the synthetic resin of the interior body inside the container containing hot rice etc. is slightly softened by heat, the interior body, especially the bottom There may be a problem of swelling inward.
【０００９】そこで、コンテナの外装体の一部に、圧力
差によって開弁してコンテナ壁体内（内装体と外装体と
の間の断熱層の部分）から外部への流通のみを可能にす
る逆止弁付き通気孔、さらに必要な場合は、外部からコ
ンテナ壁体内への流通のみを可能にする逆止弁付きの通
気孔を設けることとしたものである。Therefore, a valve is opened in a part of the outer casing of the container due to a pressure difference, and only the flow from the inside of the container wall (the portion of the heat insulating layer between the inner and outer casings) to the outside is allowed. A vent hole with a stop valve, and if necessary, a vent hole with a check valve that allows only the flow from the outside into the container wall body is provided.
【００１０】本発明は、特に前記の通気孔に使用する逆
止弁として、弁内部のゴム状シートよりなる弁部材を容
易に取換えることができる逆止弁、さらにはコンテナ壁
体内から外部への流通のみを可能にする通気孔、外部か
らコンテナ壁体内への流通のみを可能にする通気孔のい
ずれも同じ取付け構造にでき、前記通気孔に好適に使用
できる逆止弁を提供するものであり、またこの逆止弁を
通気孔に使用した信頼性の高い断熱コンテナを提供する
ものである。According to the present invention, particularly as a check valve used for the above-mentioned ventilation hole, a check valve in which a valve member made of a rubber sheet inside the valve can be easily replaced, and further, from the inside of the container wall to the outside. It is possible to provide a check valve that can be suitably used for the above-mentioned ventilation hole because the same mounting structure can be used for both the ventilation hole that allows only the circulation of air and the ventilation hole that allows only the circulation from the outside into the container wall. The present invention also provides a highly reliable heat-insulating container using this check valve as a ventilation hole.
【００１１】[0011]
【課題を解決するための手段】上記の課題を解決する本
発明の逆止弁は、弁部材両側の圧力差によって開弁して
１方向の流通のみを可能にする逆止弁であって、筒部を
有し、該筒部内に弁部材と弁押え部材とを係脱可能に嵌
め込んでなる弁保持部材を、合成樹脂よりなり、かつ中
央部に開口を有する環状の取付ベース部材に対し、前記
筒部を前記開口内に装入して脱着可能に組付けてなり、
前記取付ベース部材は外周板部を有し、外周板部の裏面
に溶接用突縁が形成されていることを特徴とする。前記
外周板部の外形は角形をなすものとすることができる。
この逆止弁は、弁保持部材が取付ベース部材に対し脱着
可能であり、前記弁保持部材を取付ベース部材から分離
し、該弁保持部材の筒部内に嵌め込まれている弁押え部
材を取り外せば、弁部材を容易に取換えることができ
る。A check valve according to the present invention for solving the above-mentioned problems is a check valve which opens due to a pressure difference between both sides of a valve member and allows only one-way flow. A ring-shaped valve holding member, which has a tubular portion and in which a valve member and a valve pressing member are removably fitted in the tubular portion, is made of synthetic resin and has an opening in a central portion. to the mounting base member, Ri Na assembled detachably was charged the tubular portion in the opening,
The mounting base member has an outer peripheral plate portion, and a rear surface of the outer peripheral plate portion.
It is characterized in that a flange for welding is formed on . The above
The outer shape of the outer peripheral plate portion may be rectangular.
In this check valve, the valve holding member is detachable from the mounting base member, the valve holding member is separated from the mounting base member, and the valve holding member fitted in the tubular portion of the valve holding member is removed. The valve member can be easily replaced.
【００１２】請求項３の発明は、前記の逆止弁として、
中央部に円形の開口を有する環状の取付ベース部材と、
前記取付ベース部材の開口に螺合自在な円形突出部を有
し、該円形突出部内方の中央板部に通気孔が形成された
弁保持部材と、前記円形突出部内の前記中央板部より突
出する筒部内に嵌め込まれ、中央に貫通孔を有するゴム
状シートよりなる弁部材と、前記弁部材を中央板部との
間に周縁部で保持するように前記筒部内に係脱可能に嵌
め込まれた弁押え部材とを備え、前記中央板部と弁押え
部材の一方に前記弁部材の貫通孔を閉塞する突部が設け
られ、該突部側とは反対側の圧力が低くなったときに前
記弁部材の貫通孔が開くように構成されてなり、前記弁
保持部材の円形突出部が前記取付ベース部材の開口に対
し螺合されて脱着可能に締結されてなることを特徴とす
る。According to a third aspect of the invention, as the check valve,
An annular mounting base member having a circular opening in the central portion,
A valve holding member having a circular projecting portion that can be screwed into an opening of the mounting base member, and a vent hole formed in a central plate portion inside the circular projecting portion, and projecting from the central plate portion in the circular projecting portion. And a valve member made of a rubber-like sheet having a through hole in the center and a valve member and a central plate portion. A valve pressing member is provided, and a protrusion that closes the through hole of the valve member is provided on one of the central plate portion and the valve pressing member, and when the pressure on the side opposite to the protruding side becomes low. The through hole of the valve member is configured to open, and the circular protruding portion of the valve holding member is screwed into the opening of the mounting base member and is detachably fastened.
【００１３】請求項４の発明は、合成樹脂よりなる内装
体と外装体との間に断熱層を介装してなる断熱コンテナ
であって、前記請求項１〜３のいずれかに記載の逆止弁
を、前記外装体の一部に、取付ベース部材をその外周板
部の裏面に有する溶接用突縁の部分の溶接により取付
け、コンテナ壁体内と外部との間に圧力差が生じたとき
に１方向の流通を可能にする通気孔を設けてなることを
特徴とする。A fourth aspect of the present invention is a heat insulating container having a heat insulating layer interposed between an inner body and an outer body made of synthetic resin, the reverse container according to any one of the first to third aspects. A stop valve is attached to a part of the exterior body, and a mounting base member is attached to the outer peripheral plate.
And a vent hole for allowing one-way flow when a pressure difference is generated between the container wall body and the outside. To do.
【００１４】[0014]
【発明の実施の形態】次に本発明の実施の形態を図面に
基いて説明する。BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the drawings.
【００１５】図１は、弁部材両側の圧力差によって開弁
して１方向の流通のみを可能にする本発明の第１の実施
例の逆止弁（Ａ1 ）を示す断面図、図２は同逆止弁の分
解した断面図、図３は取付ベース部材をコンテナの外装
体に取付けた拡大断面図である。FIG. 1 is a sectional view showing a check valve (A1) according to a first embodiment of the present invention which opens by a pressure difference between both sides of a valve member and allows only one-way flow. FIG. FIG. 3 is an exploded cross-sectional view of the check valve, and FIG. 3 is an enlarged cross-sectional view in which the mounting base member is attached to the exterior body of the container.
【００１６】この逆止弁（Ａ1 ）は、中央に円形の開口
（11）を有する環状の取付ベース部材（１）と、後述す
る弁部材（３）および弁押え部材（４）を内部に保持す
る弁保持部材（２）とからなり、次のように構成されて
いる。This check valve (A1) internally holds an annular mounting base member (1) having a circular opening (11) in the center, and a valve member (3) and a valve holding member (4) described later. And a valve holding member (2), which is configured as follows.
【００１７】取付ベース部材（１）は、合成樹脂よりな
り、開口（11）の周縁に裏面側へ突出する筒部（12）を
有し、前記開口（11）が筒部（12）内周にまで連続し
て、該開口（11）の内周にネジ（13）が前記筒部（12）
の端部を残すように形成されている。前記取付ベース部
材（１）の外周板部（14）の表面には環状の凹溝（15）
が形成されて、該凹溝にＯリング（16）が嵌着されてお
り、該取付けベース部材（１）に組付けられる弁保持部
材（２）の周縁部が対接することにより、その両者間が
シール状態に保持されるようになっている。The mounting base member (1) is made of synthetic resin, and has a cylindrical portion (12) projecting to the back side at the periphery of the opening (11), and the opening (11) is the inner circumference of the cylindrical portion (12). Continuously, the screw (13) is provided on the inner circumference of the opening (11), and
Is formed so as to leave the end portion of. An annular groove (15) is formed on the surface of the outer peripheral plate portion (14) of the mounting base member (1).
Is formed, an O-ring (16) is fitted in the groove, and the peripheral portion of the valve holding member (2) assembled to the mounting base member (1) is in contact with each other, so that the space between them is increased. Is kept in a sealed state.
【００１８】前記外周板部（14）の裏面には環状の溶接
用突縁（17）が形成されており、使用対象となる断熱コ
ンテナ（50）の外装体（52）に有する取付用孔（55）に
前記筒部（12）を嵌合した状態で、前記突縁（17）を外
装体（52）に押し当てて高速で回転させることにより、
図３のように前記突縁（17）の部分を摩擦熱で溶融させ
て外装体（52）に対し溶接できるようになっている。こ
の際、外周板部（14）の外形が図４のような６角形等の
角形をなしていると、ナットランナー等の回転付与手段
を利用して回転を与えることができる。前記弁保持部材
（２）は、前記取付ベース部材（１）の外周板部（14）
の表面と対向するフランジ状の周縁部（21）と、該周縁
部（21）より裏面側に突出する筒状の円形突出部（22）
を有し、この円形突出部（22）の先端側が内方の中央板
部（24）より突出する筒部（22ａ）として形成され、前
記開口（11）に装入されるようになっている。この円形
突出部（22）の基部側外周には前記開口（11）内周のネ
ジ（13）と対応するネジ（23）が形成され、前記開口
（11）に対して螺合自在に設けられている。また前記中
央板部（24）に通気孔（25）が形成されている。前記円
形突出部（22）の中央板部（24）より表面側は、図５
（ａ）のように６角形等の多角形状に凹設されており、
取付ベース部材（１）に螺合する際に該凹設部（26）の
角形を利用して回転を与えることができるように形成さ
れている。An annular welding ridge (17) is formed on the back surface of the outer peripheral plate portion (14), and the mounting hole (52) of the heat insulating container (50) to be used has a mounting hole (52). With the tubular portion (12) fitted to the 55), the projecting edge ( 17) is pressed against the exterior body (52) and rotated at high speed,
As shown in FIG. 3, the projecting edge (17) can be melted by frictional heat and welded to the exterior body (52). At this time, the outer circumferential frame portion outer shape (14) forms a rectangular hexagon such as shown in FIG. 4, might give the rotation using the rotation imparting means such as a nut runner. The valve holding member (2) is the outer peripheral plate portion (14) of the mounting base member (1).
Flange-shaped peripheral edge portion (21) facing the front surface of the cylinder, and a cylindrical circular protrusion (22) protruding from the peripheral edge portion (21) to the back surface side.
The circular protrusion (22) has a tip end side formed as a cylindrical portion (22a) protruding from the inner center plate portion (24), and is inserted into the opening (11). . A screw (23) corresponding to the screw (13) on the inner circumference of the opening (11) is formed on the outer periphery of the circular protrusion (22) on the base side, and the screw (23) is provided so as to be screwed into the opening (11). ing. Further, a vent hole (25) is formed in the central plate portion (24). The surface side of the circular protrusion (22) with respect to the central plate (24) is shown in FIG.
As shown in (a), it is recessed in a polygonal shape such as a hexagon,
It is formed so that when it is screwed into the mounting base member (1), rotation can be given by utilizing the square shape of the recessed portion (26).
【００１９】そして、前記円形突出部（22）の突出端側
の筒部（22ａ）内には、中央に貫通孔（31）を有するシ
リコン等の柔軟な弾性を有するゴム状シートよりなる弁
部材（３）が中央板部（24）と対向するように嵌め込ま
れている。さらに前記弁部材（３）を前記中央板部（2
4）との間に周縁部で挟んで保持するように弁押え部材
（４）が係脱可能に嵌め込まれている。図の場合、弁押
え部材（４）の周縁部の片側に突縁（41）が形成され、
該突縁（41）と前記中央板部（24）周縁の段部（27）と
の間に前記弁部材（３）の周縁部を挟持するようになっ
ている。Then, in the cylindrical portion (22a) on the projecting end side of the circular projecting portion (22), a valve member made of a flexible rubber-like sheet such as silicon having a through hole (31) in the center thereof. (3) is fitted so as to face the central plate portion (24). Further, the valve member (3) is attached to the central plate portion (2
A valve pressing member (4) is removably fitted so as to be sandwiched and held between it and 4). In the case of the figure, the projecting edge (41) is formed on one side of the peripheral edge portion of the valve pressing member (4),
The peripheral edge of the valve member (3) is sandwiched between the projecting edge (41) and the step (27) at the peripheral edge of the central plate (24).
【００２０】前記弁押え部材（４）は、前記筒部（22
ａ）の端部内周の数個所、例えば図５（ｂ）のように周
方向等間隔毎の４個所に有する係止部（28）に係止する
ことにより、前記の嵌め込み状態に保持されている。こ
の係止部（28）による係止構造は、自然に外れることは
ないが、ドライバー等を使えば容易に抜脱できるように
形成される。ねじ込み手段によって、前記弁押え部材
（４）を筒部（22ａ）内に係脱可能に嵌め込むことも可
能である。[0020] The valve pressing member (4) is pre-Symbol cylinder portion (22
By retaining at several places on the inner circumference of the end of a), for example, at the retaining parts (28) provided at four places at equal intervals in the circumferential direction as shown in FIG. 5 (b), the fitting state is maintained. There is. The locking structure by the locking portion (28) does not come off naturally, but is formed so that it can be easily pulled out by using a driver or the like. The valve pressing member (4) can be removably fitted into the tubular portion (22a) by a screwing means.
【００２１】そして、第１の実施例の場合、前記の弁押
え部材（４）には、その中央部に前記弁部材（３）の貫
通孔（31）を閉塞できる略半球状の突部（42）が設けら
れるとともに、前記の嵌め込み状態において、前記突部
（42）が前記弁部材（３）の中央部に弾力的に対接し
て、前記貫通孔（31）を閉塞状態に保持しており、前記
突部（42）を有する弁押え部材（４）の側が逆止弁の表
面側（外側）より高圧になったときにのみ、弁部材
（３）が弾性力に抗して前記突部（42）から離れること
により、貫通孔（31）が開口した開弁状態となり、弁押
え部材（４）の側から表面側へ空気流通するようになっ
ている。（43）は弁押え部材（４）の前記突部（42）の
周辺部等に設けた通気孔である。In the case of the first embodiment, the valve pressing member (4) has a substantially hemispherical projection () which can close the through hole (31) of the valve member (3) at the center thereof. 42) is provided, and in the fitted state, the protrusion (42) elastically contacts the central portion of the valve member (3) to hold the through hole (31) in a closed state. The valve member (3) resists the elastic force only when the pressure of the valve pressing member (4) having the protrusion (42) becomes higher than the surface side (outside) of the check valve. By moving away from the portion (42), the through hole (31) is opened and the valve is opened, so that the air flows from the valve pressing member (4) side to the surface side. Reference numeral (43) is a vent hole provided in a peripheral portion of the protrusion (42) of the valve pressing member (4) and the like.
【００２２】したがって、この第１の実施例の逆止弁
（Ａ1 ）は、例えば図１０、図１１に示す断熱コンテナ
（50）において、コンテナ壁体内から外部への流通のみ
を可能にする通気孔（６）を構成するのに使用される。Therefore, the check valve (A1) of the first embodiment has a vent hole that allows only the flow from the inside of the container wall to the outside in the heat insulating container (50) shown in FIGS. 10 and 11, for example. Used to construct (6).
【００２３】図７〜図９は、本発明の第２の実施例の逆
止弁（Ａ2 ）を示している。7 to 9 show a check valve (A2) according to a second embodiment of the present invention.
【００２４】この第２の実施例の逆止弁（Ａ2 ）は、上
記した第１の実施例の逆止弁（Ａ1）とその基本的構成
を共通にして、上記と同様に、中央に円形の開口（11）
を有する環状の取付ベース部材（１）と、前記取付ベー
ス部材の開口（11）内周に対し螺合自在な円形突出部
（22）を有する弁保持部材（20）と、前記円形部部（2
2）の中央板部（24）より突出する筒部（22ａ）内に嵌
め込まれたゴム状シートよりなる弁部材（３）と、該弁
部材（３）を前記中央板部との間に保持するように係脱
可能に嵌め込まれた弁押え部材（40）とから構成されて
いる。これらの構成各部のうち、上記実例と同じ構成部
分については同符号を付してその詳しい説明を省略す
る。The check valve (A2) of the second embodiment has the same basic structure as the check valve (A1) of the first embodiment described above, and has a circular shape at the center like the above. Openings (11)
An annular mounting base member (1), a valve holding member (20) having a circular protrusion (22) that can be screwed into the inner periphery of the opening (11) of the mounting base member, and the circular portion ( 2
2) A valve member (3) made of a rubber-like sheet fitted in a tubular portion (22a) protruding from the central plate portion (24) and holding the valve member (3) between the central plate portion and the central plate portion. And a valve pressing member (40) that is detachably fitted. Of these components, the same components as those in the above-described example are designated by the same reference numerals, and detailed description thereof will be omitted.
【００２５】この実施例の逆止弁（Ａ2 ）の場合は、第
１の実施例の弁押え部材（４）とは異なり、弁押え部材
（40）には弁部材（３）の貫通孔（31）を閉塞する突部
が設けられず、中央に通気孔（43ａ）が設けられてい
る。そして弁部材（３）を中間にして前記弁押え部材
（40）と対向する前記中央板部（24）の中央部に弁部材
（３）の貫通孔（31）を閉塞できる略半球状の突部（2
9）が設けられて、前記の嵌め込み状態において、前記
突部（29）が前記弁部材（３）に弾力的に対接して、前
記貫通孔（31）を閉塞状態に保持しており、その周辺歩
に通気孔（25ａ）が設けられている。そして、前記突部
（29）を有する中央板部（24）の側が弁押え部材（40）
側より高圧になったときにのみ、弁部材（３）が弾性力
に抗して前記突部（29）から離れることにより、貫通孔
（31）が開口して開弁状態となり、表面側（外部）から
弁押え部材（40）の側へ空気流通するようになってい
る。In the case of the check valve (A2) of this embodiment, unlike the valve holding member (4) of the first embodiment, the valve holding member (40) has a through hole (of the valve member (3)). No protrusion for closing 31) is provided, and a vent hole (43a) is provided in the center. A substantially hemispherical protrusion capable of closing the through hole (31) of the valve member (3) at the central portion of the central plate portion (24) facing the valve pressing member (40) with the valve member (3) in the middle. Department (2
9) is provided, and in the fitted state, the projection (29) elastically contacts the valve member (3) to hold the through hole (31) in a closed state. Vents (25a) are provided in the peripheral steps. The side of the central plate portion (24) having the protrusion (29) is on the side of the valve pressing member (40).
Only when the pressure becomes higher than the side, the valve member (3) separates from the protrusion (29) against the elastic force, so that the through hole (31) is opened to open the valve, and the surface side ( Air is circulated from the outside) to the valve holding member (40) side.
【００２６】したがって、この第２の実施例の逆止弁
（Ａ2 ）は、例えば図１０、図１１に示す断熱コンテナ
（50）において、外部からコンテナ壁体内への流通のみ
を可能にする通気孔（７）を構成するのに使用される。Therefore, the check valve (A2) of the second embodiment has a vent hole which allows only the flow from the outside into the container wall in the heat insulating container (50) shown in FIGS. 10 and 11, for example. Used to construct (7).
【００２７】このように、上記の逆止弁（Ａ1 ）と逆止
弁（Ａ2 ）とは、その基本的な構成を共通にして、弁部
材（３）の貫通孔（31）を閉塞する突部の配置、すなわ
ち前記弁押え部材（４）側に突部（42）を設けるか、中
央板部（24）側に突部（29）を設けるかの違いのみによ
って、流通方向を異にすることができ、取付けベース部
材（１）を共通とすることができる。As described above, the check valve (A1) and the check valve (A2) have the same basic structure, and the protrusion for closing the through hole (31) of the valve member (3). The distribution direction is different only by the arrangement of the parts, that is, the protrusion (42) is provided on the valve pressing member (4) side or the protrusion (29) is provided on the central plate portion (24) side. The mounting base member (1) can be common.
【００２８】なお、取付ベース部材（１）のほか、弁保
持部材（２）（20）および弁押え部材（４）（40）につ
いても、通常、合成樹脂により形成される。In addition to the mounting base member (1), the valve holding members (2) (20) and the valve holding members (4) (40) are usually made of synthetic resin.
【００２９】図１０および図１１に示す断熱コンテナ
（50）は、合成樹脂の成形体よりなる内装体（51）と外
装体（52）との間に合成樹脂発泡体よりなる断熱層（5
3）を介装した状態で、前記内装体（51）と外装体（5
2）の端部同士を溶接手段により気密に接合一体化する
ことにより構成されている。（54）はその接合部分を示
している。The heat insulation container (50) shown in FIGS. 10 and 11 has a heat insulation layer (5) made of synthetic resin foam between an inner body (51) made of a synthetic resin molded body and an outer body (52).
With the interposition of 3), the inner body (51) and the outer body (5)
It is constructed by joining the ends of 2) airtightly by welding means. (54) shows the joint.
【００３０】断熱コンテナ（50）としては、内装体（5
1）と外装体(52)とを、接着手段等の他の手段により接
合したもの、内装体と外装体との全体を中空成形により
一体に成形するか、あるいは前記の接合手段により中空
に形成しておいて、その中空内部にウレタン等の注入し
発泡させて断熱層を設けたものでもよい。As the heat insulating container (50), the inner body (5
1) and the exterior body (52) are joined by another means such as an adhesive means, the whole of the interior body and the exterior body are integrally molded by hollow molding, or are formed hollow by the above-mentioned joining means. Alternatively, the heat insulating layer may be provided by pouring urethane or the like into the hollow portion and foaming the same.
【００３１】なお、図示を省略しているが、断熱コンテ
ナ（50）は、通常、上記と同様に非発泡の合成樹脂によ
り形成された内装体と外装体との間に合成樹脂発泡体等
よりなる断熱層を介装して構成した蓋体を被嵌して使用
する。Although not shown, the heat insulating container (50) is usually made of a synthetic resin foam or the like between the inner body and the outer body formed of non-foaming synthetic resin as described above. A cover body having a heat insulating layer formed therein is fitted and used.
【００３２】この断熱コンテナ（50）の例えば相対向す
る側壁部において、上記した第１の実施例の逆止弁（Ａ
1 ）および第２の実施例の逆止弁（Ａ2 ）を、それぞれ
取付ベース部材（１）（１）を外装体（52）に固着する
ことにより取付けて、前記通気孔（６）および（７）を
構成するが、この際、双方の逆止弁（Ａ1 ）（Ａ2 ）に
共通の取付ベース部材（１）（１）を用い、同じ取付構
造にして外装体（52）に取付けることができ、特別の加
工を必要としない。At the side wall portions of the heat insulating container (50) facing each other, for example, the check valve (A) of the above-described first embodiment.
1) and the check valve (A2) of the second embodiment are attached by fixing the mounting base members (1) and (1) to the exterior body (52), respectively, and the ventilation holes (6) and (7) are attached. In this case, the common mounting base members (1) and (1) are used for both check valves (A1) and (A2), and the same mounting structure can be applied to the exterior body (52). , No special processing required.
【００３３】しかも、弁部材（３）および弁押え部材
（４）（40）を筒部（22ａ）内に嵌め込んだ弁保持部材
（２）（20）を、それぞれ前記取付ベース部材（１）
（１）の開口（11）（11）に筒部（22）（22）を螺合し
て締結することにより容易にかつ強固に一体性よく取付
けることができる。Moreover, the valve holding members (2) and (20) in which the valve member (3) and the valve pressing members (4) and (40) are fitted in the tubular portion (22a) are respectively attached to the mounting base member (1).
By screwing and fastening the tubular portions (22) and (22) into the openings (11) and (11) of (1), they can be easily and firmly attached with good integrity.
【００３４】前記の逆止弁（Ａ1 ）を備える通気孔
（６）においては、コンテナ壁体内と外部とに圧力差の
ない通常時は、図１に示すように、ゴム状シートよりな
る弁部材（３）が弁押え部材（４）に有する突部（42）
により閉塞状態に保持されており、空気の流通が起こら
ない。ところが、外部の気圧がコンテナ壁体内より低く
なると、図１に仮想線で示すように、弁部材（３）の中
央部が弾性力に抗して中央板部（24）の側へ膨れるよう
に変形して、貫通孔（31）の部分が開き、コンテナ壁体
内から外部へ空気が流出する。In the vent hole (6) provided with the check valve (A1), a valve member made of a rubber-like sheet is normally provided as shown in FIG. 1 when there is no pressure difference between the inside of the container wall and the outside. The protrusion (42) which (3) has on the valve pressing member (4)
Is kept in a closed state, and air does not flow. However, when the external atmospheric pressure becomes lower than the inside of the container wall, the central portion of the valve member (3) bulges toward the central plate portion (24) against the elastic force as shown by the phantom line in FIG. By the deformation, the through hole (31) is opened, and the air flows out from the container wall body to the outside.
【００３５】したがって、コンテナの真空冷却時には、
コンテナ壁体内から空気が流出し、断熱コンテナ内部と
外部で大きな圧力差が生じないので、内装体の膨れ等の
変形が防止される。Therefore, during vacuum cooling of the container,
Since air does not flow out from the container wall and a large pressure difference does not occur between the inside and outside of the heat insulating container, deformation such as swelling of the interior body is prevented.
【００３６】一方、逆止弁（Ａ2 ）を備える通気孔
（７）においては、コンテナ壁体内と外部とに圧力差の
ない通常時は、図５に示すように、ゴム状シートよりな
る弁部材（３）が中央板部（24）に有する突部（29）に
より閉塞状態に保持されており、空気の流通が起こらな
いが、外部の気圧がコンテナ壁体内より高圧になると、
図５に仮想線で示すように、弁部材（３）の中央部が弾
性力に抗して弁押え部材（40）の側へ膨れるように変形
し、貫通孔（31）の部分が開き、外部からコンテナ壁体
内へ空気が流入し、外部とコンテナ壁体内との圧力差が
緩和されるので、真空冷却後に常圧に戻すときにも変形
は生じない。On the other hand, in the vent hole (7) provided with the check valve (A2), in a normal state where there is no pressure difference between the inside of the container wall and the outside, as shown in FIG. (3) is held in a closed state by the protrusion (29) provided on the central plate (24), and air does not flow, but when the external atmospheric pressure becomes higher than the container wall,
As shown in phantom in FIG. 5, the central portion of the valve member (3) is deformed so as to bulge toward the valve holding member (40) side against the elastic force, and the through hole (31) is opened, Since air flows from the outside into the container wall body and the pressure difference between the outside and the container wall body is relaxed, no deformation occurs even when returning to normal pressure after vacuum cooling.
【００３７】また、前記逆止弁（Ａ1 ）（Ａ2 ）は、上
記したようにコンテナ壁体内と外部とに圧力差が生じる
ことによって開くので、コンテナを水洗する際には、特
に圧力を加えない限り、逆止弁の部分から水が侵入する
おそれは殆どない。Since the check valves (A1) and (A2) are opened by the pressure difference between the inside and the outside of the container wall as described above, no particular pressure is applied when the container is washed with water. As long as there is no risk of water invading through the check valve.
【００３８】さらに、前記弁保持部材（２）（20）は、
取付ベース部材（１）に対して螺合手段により脱着でき
るようになっているので、内部の弁部材（３）の取換え
の必要が生じたときには、前記の螺合を緩めて弁保持部
材（２）（20）を取付ベース部材（１）から取外せば、
弁押え部材（４）（40）を筒部（22）から抜脱すること
ができ、弁部材（３）を容易に取換えることできる。Further, the valve holding members (2) (20) are
Since it can be attached to and detached from the mounting base member (1) by a screwing means, when it is necessary to replace the internal valve member (3), the screwing is loosened and the valve holding member ( 2) If you remove (20) from the mounting base member (1),
The valve retainer members (4) (40) can be removed from the tubular portion (22), and the valve member (3) can be easily replaced.
【００３９】[0039]
【発明の効果】上記したように本発明の逆止弁によれ
ば、弁部材を保持する弁保持部材が取付ベース部材に対
し脱着可能であるため、前記取付ベース部材をコンテナ
等に固定した状態のままで、弁保持部材のみを取外して
内部の弁部材を容易に取換えることができる。これによ
り、逆止弁としての機能を長期にわたって良好に維持で
きる。As described above, according to the check valve of the present invention, the valve holding member for holding the valve member can be attached to and detached from the mounting base member, so that the mounting base member is fixed to the container or the like. As it is, the internal valve member can be easily replaced by removing only the valve holding member. Thereby, the function as the check valve can be favorably maintained for a long period of time.
【００４０】特に請求項３の構成を採用することより、
弁保持部材の脱着がさらに容易になり、弁部材の取換に
要する手数をさらに軽減できるばかりか、弁部材の貫通
孔を閉塞する突部の配置を変えるだけで流通方向を変更
できるので、同じ構成の取付けベース部材を用いて、コ
ンテナ等への取付状態を同じ構造にして、内部の弁機構
の流通方向の異なる逆止弁を構成することができる。そ
のため、断熱コンテナとして、コンテナ壁体内から外部
への流通を可能にする通気孔、外部からコンテナ壁体内
への流通を可能にする通気孔をそれぞれ特別の加工を要
さずに構成できる。In particular, by adopting the structure of claim 3 ,
Since the valve holding member can be easily attached and detached, the number of steps required for replacing the valve member can be further reduced, and the flow direction can be changed only by changing the arrangement of the protrusions that close the through holes of the valve member. By using the mounting base member having the structure, the check valves having different flow directions of the internal valve mechanism can be configured by having the same mounting state to the container or the like. Therefore, as the heat insulating container, it is possible to configure a vent hole that allows the fluid to flow from the container wall body to the outside and a vent hole that allows the fluid to flow from the container wall body to the outside without special processing.
【００４１】また請求項４の断熱コンテナによれば、上
記した逆止弁付きの通気孔を有することにより、コンテ
ナ壁体内と外部との圧力差が生じたときには、コンテナ
壁体内と外部との間で空気が流通して、コンテナ壁体内
と外部とに大きな圧力差が生じず、変形の生じ難い断熱
コンテナを得ることができる。特に、真空冷却時の急激
な減圧によっても内装体が内方へ膨れて変形するのが防
止されるので、食材を適温で輸送、供給するコンテナと
して好適に使用できる。しかも通気孔に使用される逆止
弁の内部の弁部材の取換も容易に行なえ、長期に渡って
信頼性を損うことなく使用できる。Further, according to the heat insulating container of the fourth aspect , by having the above-mentioned vent hole with a check valve, when a pressure difference between the inside of the container wall and the outside occurs, the container is opened between the inside and the outside of the container wall. In this way, the air circulates, a large pressure difference does not occur between the inside of the container wall and the outside, and it is possible to obtain a heat-insulating container that is unlikely to be deformed. In particular, the inner body is prevented from swelling and deforming due to a sudden pressure reduction during vacuum cooling, so that it can be suitably used as a container for transporting and supplying foodstuffs at an appropriate temperature. Moreover, the valve member inside the check valve used for the ventilation hole can be easily replaced, and the valve member can be used for a long period of time without impairing its reliability.
【図１】本発明の逆止弁の第１の実施例を示す縦断面図
である。FIG. 1 is a longitudinal sectional view showing a first embodiment of a check valve according to the present invention.
【図２】同上の逆止弁の分解した断面図である。FIG. 2 is an exploded sectional view of the above check valve.
【図３】取付ベース部材を断熱コンテナに取付けた状態
の断面図である。FIG. 3 is a cross-sectional view showing a state in which a mounting base member is mounted on a heat insulating container.
【図４】取付けベース部材の正面図である。FIG. 4 is a front view of a mounting base member.
【図５】弁保持部材の正面図（ａ）と背面図（ｂ）であ
る。FIG. 5 is a front view (a) and a rear view (b) of the valve holding member.
【図６】弁押え部材の正面図である。FIG. 6 is a front view of a valve pressing member.
【図７】本発明の逆止弁の第２の実施例を示す縦断面図
である。FIG. 7 is a vertical sectional view showing a second embodiment of the check valve of the present invention.
【図８】同上の逆止弁の分解した断面図である。FIG. 8 is an exploded sectional view of the above check valve.
【図９】同実施例の弁保持部材の正面図（ａ）と背面図
である。FIG. 9 is a front view (a) and a rear view of the valve holding member of the embodiment.
【図１０】本発明の逆止弁を使用した断熱コンテナを示
す一部欠截斜視図である。FIG. 10 is a partially cutaway perspective view showing a heat insulating container using the check valve of the present invention.
【図１１】同上の断熱コンテナの断面図である。FIG. 11 is a cross-sectional view of the heat insulating container of the above.
（１） 取付ベース部材 （11） 開口 （12） 筒部 （14） 外周板部 （２） 弁保持部材 （２）（20） 弁保持部材 （21） 周縁部 （22） 円形突出部 （22ａ） 筒部 （24） 中央板部 （25）（25ａ） 通気孔 （28） 係止部 （29） 突部 （３） 弁部材 （31） 貫通孔 （４）（40） 弁押え部材 （41） 周縁部 （42） 突部 （43）（43ａ） 連通孔 （50） 断熱コンテナ （51） 内装体 （52） 外装体 （53） 断熱層 （54） 接合部分 （55） 取付用孔 （６）（７） 逆止弁付きの通気孔 (1) Mounting base member (11) Opening (12) Tube (14) Peripheral plate (2) Valve holding member (2) (20) Valve holding member (21) Perimeter (22) Circular protrusion (22a) Tube (24) Central plate (25) (25a) Vent hole (28) Locking part (29) Projection (3) Valve member (31) Through hole (4) (40) Valve retainer (41) Perimeter (42) Projection (43) (43a) Communication hole (50) Insulated container (51) Interior body (52) Exterior body (53) Thermal insulation layer (54) Joint part (55) Mounting hole (6) (7) Vent with check valve
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平９−301443（ＪＰ，Ａ) 特開 平５−126267（ＪＰ，Ａ) 特開 平７−12250（ＪＰ，Ａ) 特開 昭50−153325（ＪＰ，Ａ) 特開 昭61−274180（ＪＰ，Ａ) 実開 昭55−159123（ＪＰ，Ｕ) 実開 昭55−112685（ＪＰ，Ｕ) 実開 昭53−137333（ＪＰ，Ｕ) 実開 昭51−34585（ＪＰ，Ｕ) 特公 昭34−1937（ＪＰ，Ｂ１) 実公 昭63−30861（ＪＰ，Ｙ１) (58)調査した分野(Int.Cl.7，ＤＢ名) F16K 15/00 - 17/168 F16K 24/00 - 24/04 B65D 81/38 F16L 59/04 ─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-9-301443 (JP, A) JP-A-5-126267 (JP, A) JP-A-7-12250 (JP, A) JP-A-50- 153325 (JP, A) JP 61-274180 (JP, A) Actually opened 55-159123 (JP, U) Actually opened 55-112685 (JP, U) Actually opened 53-137333 (JP, U) 51-34585 (JP, U) JP-34-1937 (JP, B1) 63-30861 (JP, Y1) JP (Y) (58) Fields investigated (Int.Cl. 7 , DB name) F16K 15/00-17/168 F16K 24/00-24/04 B65D 81/38 F16L 59/04
Claims (4)
向の流通のみを可能にする逆止弁であって、筒部を有
し、該筒部内に弁部材と弁押え部材とを係脱可能に嵌め
込んでなる弁保持部材を、合成樹脂よりなり、かつ中央
部に開口を有する環状の取付ベース部材に対し、前記筒
部を前記開口内に装入して脱着可能に組付けてなり、前
記取付ベース部材は外周板部を有し、外周板部の裏面に
溶接用突縁が形成されていることを特徴とする逆止弁。1. A check valve which opens by a pressure difference between both sides of a valve member and allows only one-way flow, and has a tubular portion, and a valve member and a valve pressing member are provided in the tubular portion. A valve holding member that is detachably fitted is attached to a ring-shaped mounting base member made of synthetic resin and having an opening at the center so that the tubular portion can be inserted into and removed from the opening. Do Te Ri, before
The mounting base member has an outer peripheral plate, and
A non-return valve characterized in that a welding ridge is formed .
とを特徴とする請求項１に記載の逆止弁。 2. The outer shape of the outer peripheral plate portion is square.
The check valve according to claim 1, wherein:
ース部材と、 前記取付ベース部材の開口に螺合自在な円形突出部を有
し、該円形突出部内方の中央板部に通気孔が形成された
弁保持部材と、 前記円形突出部内の前記中央板部より突出する筒部内に
嵌め込まれ、中央に貫通孔を有するゴム状シートよりな
る弁部材と、 前記弁部材を中央板部との間に周縁部で保持するように
前記筒部内に係脱可能に嵌め込まれた弁押え部材とを備
え、 前記中央板部と弁押え部材との一方に前記弁部材の貫通
孔を閉塞する突部が設けられ、該突部側とは反対側の圧
力が低くなったときに前記弁部材の貫通孔が開くように
構成されてなり、 前記弁保持部材の円形突出部が取付ベース部材の開口に
対し螺合されて脱着可能に締結されてなることを特徴と
する請求項１または２に記載の逆止弁。3. An annular mounting base member having a circular opening in the center, and a circular projecting portion that can be screwed into the opening of the mounting base member, and a vent hole in the central plate portion inside the circular projecting portion. A valve holding member formed, a valve member made of a rubber-like sheet fitted in a cylindrical portion protruding from the central plate portion in the circular protruding portion and having a through hole in the center, and the valve member as a central plate portion. A valve pressing member that is removably fitted in the tubular portion so as to be held at the peripheral edge between the central plate portion and the valve pressing member, and a protrusion that closes the through hole of the valve member. Is provided, and the through hole of the valve member is opened when the pressure on the side opposite to the protruding side is low, and the circular protruding portion of the valve holding member is the opening of the mounting base member. It is characterized in that it is screwed onto and is removably fastened. Check valve according to Motomeko 1 or 2.
断熱層を介装してなる断熱コンテナであって、前記請求
項１〜３のいずれかに記載の逆止弁を、前記外装体の一
部に、取付ベース部材の外周板部の裏面に有する溶接用
突縁の部分の溶接により取付け、コンテナ壁体内と外部
との間に圧力差が生じたときに１方向の流通を可能にす
る通気孔を設けてなることを特徴とする断熱コンテナ。4. A heat insulating container having a heat insulating layer interposed between an inner body and an outer body made of synthetic resin, the check valve according to any one of claims 1 to 3 comprising: For welding on a part of the exterior body, on the back surface of the outer peripheral plate of the mounting base member
A heat-insulating container, characterized in that it is provided with a vent hole, which is attached by welding the portion of the projecting edge and which allows one-way flow when a pressure difference occurs between the inside of the container wall and the outside.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12729698A JP3374190B2 (en) | 1998-05-11 | 1998-05-11 | Check valves and insulated containers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12729698A JP3374190B2 (en) | 1998-05-11 | 1998-05-11 | Check valves and insulated containers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11325284A JPH11325284A (en) | 1999-11-26 |
| JP3374190B2 true JP3374190B2 (en) | 2003-02-04 |
Family
ID=14956462
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12729698A Expired - Fee Related JP3374190B2 (en) | 1998-05-11 | 1998-05-11 | Check valves and insulated containers |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3374190B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004111510A1 (en) * | 2003-06-12 | 2004-12-23 | Kohei Nakamura | Flat valve device |
| KR101573894B1 (en) * | 2013-11-19 | 2015-12-03 | 김동립 | Valve device for backflow and water hammer prevention |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4732842B2 (en) * | 2005-09-09 | 2011-07-27 | 株式会社ブリヂストン | Vibration isolator |
| US9016319B2 (en) * | 2007-08-22 | 2015-04-28 | Societe Bic | Relief valves for fuel cell systems |
| JP5469434B2 (en) * | 2009-01-08 | 2014-04-16 | コロナ技研工業株式会社 | Check valve |
| JP5651141B2 (en) * | 2012-05-24 | 2015-01-07 | 明星工業株式会社 | Thermal insulation repair method for thermal insulation structure |
| JP6253452B2 (en) * | 2014-03-04 | 2017-12-27 | 未来工業株式会社 | Exhaust valve and exhaust valve device |
| JP6761159B2 (en) * | 2014-11-19 | 2020-09-23 | キョーラク株式会社 | Laminate peeling container |
| WO2016080313A1 (en) * | 2014-11-19 | 2016-05-26 | キョーラク株式会社 | Lamination separation container |
-
1998
- 1998-05-11 JP JP12729698A patent/JP3374190B2/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004111510A1 (en) * | 2003-06-12 | 2004-12-23 | Kohei Nakamura | Flat valve device |
| US7044443B2 (en) | 2003-06-12 | 2006-05-16 | Kohei Nakamura | Flat valve device |
| CN100334377C (en) * | 2003-06-12 | 2007-08-29 | 中村浩平 | Flat valve device |
| KR101573894B1 (en) * | 2013-11-19 | 2015-12-03 | 김동립 | Valve device for backflow and water hammer prevention |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11325284A (en) | 1999-11-26 |
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