JPH0324377A - Swing type non-water-hammer check valve device - Google Patents
Swing type non-water-hammer check valve deviceInfo
- Publication number
- JPH0324377A JPH0324377A JP15900489A JP15900489A JPH0324377A JP H0324377 A JPH0324377 A JP H0324377A JP 15900489 A JP15900489 A JP 15900489A JP 15900489 A JP15900489 A JP 15900489A JP H0324377 A JPH0324377 A JP H0324377A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- closing force
- check valve
- box
- valve closing
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 35
- 238000005086 pumping Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000001133 acceleration Effects 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Landscapes
- Check Valves (AREA)
Abstract
Description
【発明の詳細な説明】
（イ）産業上の利用分野
この発明は、送水管路に設けるスイング型逆止弁装訴に
係り、送水中に、急にボンブエネルギーを絶った場合、
管路内水柱の逆流による水撃作用を安全適確に阻止する
スイング型無水撃逆止弁装訝に関するものである。[Detailed description of the invention] (a) Industrial application field This invention relates to a swing type check valve installed in a water supply pipeline, and when bomb energy is suddenly cut off during water supply,
This invention relates to a swing type non-water hammer check valve system that safely and accurately prevents the water hammer effect caused by the backflow of the water column in a pipeline.
そして、この発明は、逆止弁を設けた揚水装置において
、この逆止・弁の構造を、ポンプへの入力が絶たれたと
き、管内吐出方向流れが、慣性力を失い停止する時点で
着座するよう、弁体部およびその付近の流路形状を相定
め構成させて、管内水の逆流を阻止し、水撃発生の要因
を断つ揚水装置に係り、特許第４５２６１５号（特公昭
４０−８６５４号）「無水撃揚水装置」並びに特許第８
５１９７７号（特公昭５１−２５９３０号）「無水撃揚
水Ｖｊ置の改良」、及び特公昭６３〜６０２７４号「ス
イング型無水撃逆止弁装置」の一連の発明を基本的技術
とし、更にその技術概念を管路条件７力く複雑で、各所
に水柱分離の発生を予測されるような揚水系、循環系装
置にまで展開させた特許第１２３７３５６号（特公昭５
７−０３８７９６号）「管路内における水柱分離の発生
を積極的に容認した揚水装置］に関連するこれ等の技術
の改良に関する。In a water pumping device equipped with a check valve, the present invention improves the structure of the check valve so that when the input to the pump is cut off, the flow in the discharge direction in the pipe loses inertia and stops. Japanese Patent No. 452,615 (Japanese Patent Publication No. 40-8654 No.) “Waterless Hammer Pumping Device” and Patent No. 8
51977 (Special Publication No. 51-25930) ``Improvement of Non-Water Hammer Pumped Vj Installation'' and Special Publication No. 63-60274 ``Swing Type Non-Water Hammer Check Valve Device'' as the basic technology, and further developed the technology. Patent No. 1237356 (Japanese Patent Publication No. 1237356), which expanded the concept to include pumping systems and circulation systems that have extremely complex pipe conditions and are expected to cause water column separation at various locations.
No. 7-038796) relates to improvements in these technologies related to ``storage pumping devices that actively tolerate the occurrence of water column separation within the pipeline''.
そして、以下説明上、これらの発明を総称的に原究明と
吋称する。In the following explanation, these inventions will be collectively referred to as original research.
（ロ）従来の技術
揚水装置に設けた逆止弁が、ボンブ停止時の急激な管内
流速の変化に追従できず、その逆流過程で着座すると、
弁閉鎖の瞬間に、弁下流側（弁吐出側の管路内）で水撃
現象を生じ、また管路条件によっては、水柱分離による
水撃をも誘発して、重大事故にいたることがある。(b) Conventional technology If the check valve installed in the pumping device cannot follow the sudden change in the flow velocity in the pipe when the bomb stops, and the tank sits during the backflow process,
At the moment the valve closes, a water hammer phenomenon occurs on the downstream side of the valve (in the pipeline on the valve discharge side), and depending on the pipeline conditions, water hammer may also occur due to separation of the water column, leading to a serious accident. .
従来、このような水撃作用を防止する揚水装置として、
主に次の（Ａ），（Ｂ）に述べる技術がある。すなわち
（Ａ）弁部材に制動手段を設けて、その動作を緩慢にし
、更には水撃による上昇圧力を、逃避、緩衝させる自動
弁装置や、サージタンクを配備することにより、ショッ
クの緩和を計る、言わば消極的な、対症療法的手段を用
いた揚水装置。Conventionally, as a pumping device to prevent such water hammer effect,
There are mainly techniques described in (A) and (B) below. In other words, (A) the shock can be alleviated by installing a braking means on the valve member to slow its operation, and by installing an automatic valve device or a surge tank to escape and buffer the rising pressure caused by water hammer. , a water pumping system using passive, symptomatic measures.
（Ｂ）原発明の公告広報明細書に見られるように、慣性
による正方向流れが停止するとき、弁着座する逆止弁装
置を設けることにより、逆流現象を生じさせないように
して、積極的に水撃発生の要因を断った揚水装置。(B) As seen in the public announcement specification of the original invention, by providing a check valve device that seats the valve when the forward flow due to inertia stops, it is possible to prevent the backflow phenomenon from occurring and actively A water pumping device that eliminates the causes of water hammer.
とがあるが、本発明は、この（Ｂ）項の技術的思想に依
拠する揚水装置の改良に関する。However, the present invention relates to an improvement of a water pumping device based on the technical idea of item (B).
（ハ）発明が解決しようとする問題点
原発明に見られるような従来の無水撃揚水装置は、ポン
プへの入力が急に絶たれた場合、管内水柱の憤仕による
吐出方向流れが止まった時に、ほぼ着座する構造にした
逆止弁を設けたものであるが、この慣性流動を続ける時
間の大小は、ポンプ停止の瞬間に管内水柱が保有する慣
性流動力と、この水柱に作用する外力（重力、出口側圧
力、ボンブ慣性力など）とに関係し、状況によっては、
その値（水柱の慣性流動時間）が、甚だ小さくなる場合
も多い。(c) Problems to be solved by the invention In the conventional waterless hammer pumping device as seen in the original invention, when the input to the pump was suddenly cut off, the flow in the discharge direction was stopped due to the action of the water column in the pipe. Sometimes, a check valve is installed with a structure that almost seats the pump, but the length of time this inertial flow continues depends on the inertial flow force held by the water column in the pipe at the moment the pump stops, and the external force acting on this water column. (gravity, outlet pressure, bomb inertia, etc.), and depending on the situation,
The value (inertial flow time of the water column) is often extremely small.
例えば、ボンブの近くに設けた圧力タンクに注水する場
合とか、近接して設置した複数のボンブによる並列運転
中、急にその一台が停止したような場合とか、或は、立
聖水中ボンブ設備における、垂直配管とその床上にセッ
トされた逆止弁及び横引き出口配管との関連による場合
などである。For example, when injecting water into a pressure tank installed near a bomb, when multiple bombs installed in close proximity are running in parallel and one of them suddenly stops, or when using Ritsei underwater bomb equipment. This is the case due to the relationship between vertical piping, check valves set on the floor, and side outlet piping.
それは、これらの装置は、逆止弁下流側の管路が短いの
で、ポンプの急停止時に、この管路内水柱が保有する慣
性流動力は小さく、それに比べて、垂直管路における重
力の加速度や、圧力タンクの圧力や、並列運転中の隣接
ボンブの吐出圧力は、この水柱を逆流させる力として作
用し、その逆流に転じる時間を著しく早めるからと言え
る。In these devices, the pipeline downstream of the check valve is short, so when the pump suddenly stops, the inertial flow force held by the water column in this pipeline is small, and compared to that, the acceleration of gravity in the vertical pipeline is This is because the pressure of the pressure tank and the discharge pressure of adjacent bombs operating in parallel act as a force that causes this water column to flow backwards, significantly accelerating the time it takes for the water column to flow backwards.
従来の無水撃揚水装置においては、原発明明細，！Σに
述べているように、その逆止弁装置の構造は、弁の閉鎖
運動を阻害する要因を出来るだけ除去するように構成さ
れていて、その自重による降下だけで、適正な弁閉鎖運
動の設定ができ、なお若干の誤差があれば、弁部材と一
体的に結合する弁体桶償部（付加の形状修正部、重量、
ばね、など）により、その補正をしていた。In the conventional non-water hammer pumping device, the original invention specification,! As mentioned in Σ, the structure of the check valve device is designed to eliminate as much as possible the factors that inhibit the valve closing movement, and the proper valve closing movement is achieved only by the drop due to its own weight. If the setting is completed and there is still some error, the valve body compensation part (additional shape correction part, weight,
springs, etc.) to compensate for this.
しかしながら、このような弁部構造も、上述した実例、
即ち複数台ポンプの並列運転中、一台停止した際に生じ
るような、極限に近い厳密な対応を要する激しい逆流要
因に対しては、弁部自体の質咀が原囚で、その慣性抵抗
が大き過ぎたり、形状抵抗の削減が不充分であったりし
て、弁閉鎖の速さが流れの減速の速さに追随できない。However, such a valve part structure also has the above-mentioned example,
In other words, in the case of a severe backflow factor that requires an extremely strict response, such as occurs when one pump is stopped during parallel operation of multiple pumps, the mass of the valve itself is the source of the problem, and its inertial resistance is Either it is too large or the geometrical drag reduction is insufficient so that the valve closure rate cannot keep up with the rate of flow deceleration.
そして又、弁揺動支持軸を介して、弁箱外部に理想的な
弁閉力部材を構成させたとしても、弁閉瑣の過楳に経過
する大きな加速度の変化に対応すべき一連の弁部構成部
材への設計的配慮や水密手段等と、単純な弁体補償部へ
の技術思想では、適正な弁閉鎖運動を目途しての、簡便
で経済的な補正手段は困難であるという欠点があった。Furthermore, even if an ideal valve closing force member is constructed outside the valve body via the valve swing support shaft, a series of valves that must respond to large changes in acceleration that occur during the initial valve closing process will still be required. The disadvantage is that it is difficult to create a simple and economical correction method for proper valve closing movement by considering the design of component parts, watertight means, etc., and by simply applying technical ideas to the valve body compensation part. was there.
この発明は、無水撃揚水装置において、その構成要素で
あるスイング型逆止弁装置につき、上記問題点を解消し
、同時に、多様化が計り易い構成となし、設計、生産を
容易にして、製造価格を低減させ、一層簡単で経済的な
スイング型無水撃逆止弁装置を提供することを目的とす
る。The present invention solves the above-mentioned problems regarding the swing type check valve device, which is a component of the non-water hammer pumping device, and at the same time provides a structure that is easy to diversify, and facilitates design and production. It is an object of the present invention to provide a swing type non-water hammer check valve device which is simpler and more economical by reducing the price.
（二）問題点を解決するための手段
この発明を、一実施例の図面にもとづいて説明すると、
第１図において、ｌは揚水ボンプ（図示は省略する）か
らの配管の適所に、装置せられた逆止弁装置の弁箱であ
り、ａ，ｂは、それぞれ弁箱の入口流路と、出口流路と
を示す。２は弁座、３は逆止弁の弁部である。(2) Means for solving the problems This invention will be explained based on the drawings of one embodiment.
In FIG. 1, l is a valve box of a check valve device installed at an appropriate location in the piping from a water pump (not shown), and a and b are the inlet flow path of the valve box, respectively; and an outlet flow path. 2 is a valve seat, and 3 is a valve portion of the check valve.
弁部３は、これに一体的に設けた弁体腕部４により、弁
揺動支持軸５を介して、弁箱ｌに、弁座２の出口側に臨
み揺動自在に装着されている。The valve part 3 is swingably attached to the valve body l by a valve body arm part 4 integrally provided thereon via a valve swing support shaft 5 facing the outlet side of the valve seat 2. .
以上において、弁部３、弁体腕部４は、出来る限り軽く
、また流れ抵抗の少ない形状とし、そして、逆止弁とし
ての必要な強度をも備えた部材として形成されている。In the above, the valve portion 3 and the valve body arm portion 4 are formed as members that are as light as possible, have a shape that provides little flow resistance, and have the necessary strength as a check valve.
弁閉力部材６は、弁部３上方に位置し、重い材質の円筒
形部材などが適用され、その重心部において保持部材９
によって保持され、そして支持部材８をガイドとして上
下方向に変位可能に支持されている。The valve closing force member 6 is located above the valve part 3, and is made of a cylindrical member made of a heavy material, and a holding member 9 is attached to the center of gravity of the valve closing force member 6.
and is supported so as to be movable in the vertical direction using the support member 8 as a guide.
以上の構成において、弁閉力部材６の重さは、保持部材
９の下端部と、弁体腕部４の弁揺動支持軸５に近い位置
にある受け部材７とをリンクさせた連係構造により、弁
部３を閉鎖方向に加速する弁閉力として作用する。そし
て、それは適宜に、弁全閉付近では、所期最大限の弁閉
力として作用させ、弁全開付近では、所要最小限の弁閉
力として作用させることが出来る構造である。In the above configuration, the weight of the valve closing force member 6 is determined by the linkage structure that links the lower end of the holding member 9 and the receiving member 7 located near the valve swing support shaft 5 of the valve body arm 4. This acts as a valve closing force that accelerates the valve portion 3 in the closing direction. The structure is such that the desired maximum valve closing force can be applied when the valve is fully closed, and the required minimum valve closing force can be applied when the valve is fully open.
ｌＯは弁箱蓋であり、１１．１２は夫々弁箱の人口側、
出口側に接続する管路部分とする。lO is the valve box lid, 11 and 12 are the population side of the valve box, respectively.
This is the pipe section that connects to the outlet side.
（ホ）作用
上記のように構成した逆止弁装置は、弁体部の弁閉鎖作
用への阻害要因を極力削減しく弁部３の質量を小さくし
、形状を整え、慣性抵抗と形状抵抗を極力削減している
）、そして、弁揺動支持軸５に近い位置において強く作
用する弁閉力部材６の作用効果は、第一図における弁全
開付近においては、弁開力と弁閉力とがほぼ拮抗すると
共に、弁閉力部材６の作用力が最小限となり、第２図に
おける弁全閑付近においては、弁閉力部材６の作用力は
最大限に強く働いて、管内流れの減速の速さに優先的に
同調しながら、有効な弁閉鎖の性能を遺憾なく発揮する
。(E) Function The check valve device configured as described above reduces the mass of the valve portion 3 and adjusts its shape in order to minimize the factors that hinder the valve closing action of the valve body portion, thereby reducing inertial resistance and shape resistance. The effect of the valve closing force member 6, which acts strongly at a position close to the valve swing support shaft 5, is that the valve opening force and the valve closing force are reduced when the valve is fully open in Fig. 1. are almost equal to each other, and the acting force of the valve closing force member 6 becomes the minimum. In the vicinity of the valve being fully idle in FIG. While preferentially synchronizing with the speed of the valve, it fully demonstrates effective valve closing performance.
そして、その弁閉力部材６の作用力の強さは自由に調整
できるので、無水撃揚水装置の作動要点でもある閉鎖作
用スタート遅れの解消はもとより、厳しい仕様条件にマ
ッチさせての、弁部３への作用力も、従来のものに比べ
仕様流量時点における弁損失を充分に少なくし、しかも
その閉鎖作用力を自由に大きく取れる利点がある。Since the strength of the acting force of the valve closing force member 6 can be freely adjusted, it is possible to not only eliminate the delay in starting the closing action, which is a key point in the operation of the waterless hammer pumping system, but also to adjust the valve part to match strict specification conditions. 3, the valve loss at the specified flow rate is sufficiently reduced compared to conventional valves, and the closing force can be increased freely.
（へ）実施例
本発明の実施にあたっては、弁閉力部材６を分割して標
準化し、それを適当に組み合わせることにより、管路の
実状に適した重量となし、簡皇容易に、弁閉鎖運動の設
定を行うことができる。(f) Example In carrying out the present invention, the valve closing force member 6 is divided and standardized, and by combining them appropriately, the weight can be adjusted to suit the actual condition of the pipeline, and the valve can be closed easily. Exercise settings can be made.
尚、第４図の実施例の如く、弁閉力部材６に、ばねを適
用することも出来る。この場合、図示の如く保持部材９
を伸縮自在の筒箱型にして、弁閉力部材６を内蔵保持す
ると、至便である。Incidentally, as in the embodiment shown in FIG. 4, a spring can also be applied to the valve closing force member 6. In this case, as shown in the figure, the holding member 9
It is most convenient to make the valve-closing force member 6 into a telescopic tube-box type and to hold the valve-closing force member 6 therein.
（ト）発明の効果
この発明は以上説明したように、簡便な構逍において、
仕様流量時にあっては、弁抵抗損失は少なく、しかも閉
鎖時には、強い弁閉力により逆流に優先して閉鎖するの
で、従来では、困難とした急激な慣性流動の状態変化に
も、容易かつ簡Ｉ１１に、対応できる無水撃揚水装置を
実現できた。(g) Effect of the invention As explained above, this invention has a simple structure,
At the specified flow rate, the valve resistance loss is small, and when closing, the strong valve closing force gives priority to closing the valve over reverse flow, making it easy and simple to handle sudden changes in the state of inertial flow, which were difficult to do in the past. We were able to create a non-water hammer pumping system compatible with I11.
そして、従来のものの弁部材と穴なり、構造的に弁部３
は一定の形状となるから、従来のものに比べて、製造、
管理が容易で、著しく原価を下げることが出来た。しか
も、弁閉力部材６が嵩ばらず、分解、組み立てし易い事
は、特に大規模送水施設の各所に設置する大口径逆止弁
装置などにおいて、設計、製造、実用テスト、維持管理
のあらゆる而で優れた効果をあけることができ、実施効
果の顕著さは従来技術と比較し極めて大きい。The valve part 3 is structurally similar to the conventional valve member and hole.
Since it has a certain shape, it is easier to manufacture and use than conventional ones.
It was easy to manage and could significantly reduce costs. Moreover, the fact that the valve-closing force member 6 is not bulky and easy to disassemble and assemble means that it can be used in all aspects of design, manufacturing, practical testing, and maintenance, especially in large-diameter check valve devices installed in various locations in large-scale water supply facilities. Therefore, an excellent effect can be achieved, and the effect of implementation is extremely large compared to the conventional technology.
第１図はこの発明に係る逆止弁装惟の弁全開付近におけ
る縦断面図、第２図は第１図のものの弁全閑付近におけ
る縦断面図を示す。第３図は従来の逆止弁装置の縦断面
図、第４図は弁閉力部材にばねを適用した実施例の縦断
而図を示す。
１，２１，／ＩＩ・・・弁箱本体、２，２２，／１２・
・・弁座、３．２３．４３・・・弁部、４，２４．４４
・・・弁体腕部、５．２５．４５・・・弁揺動支持軸、
６，４６・・・弁閉力部材、７，４７・・・受け部材、
８，４８・・・支持部材、９，４９・・・保持部材、１
０，３０．５０・・・弁箱蓋、１１．１２・・・管路端
、ａ，・・・入口流路、ｂ，・・・出口流路。
竿３１！ＩＩ
手続補正書
平成０１年１２月２５日FIG. 1 is a vertical cross-sectional view of the check valve device according to the present invention near the fully open valve, and FIG. 2 is a vertical cross-sectional view of the check valve arrangement of FIG. 1 near the fully open valve. FIG. 3 is a longitudinal sectional view of a conventional check valve device, and FIG. 4 is a longitudinal sectional view of an embodiment in which a spring is applied to the valve closing force member. 1, 21, /II... Valve box body, 2, 22, /12.
... Valve seat, 3.23.43 ... Valve part, 4,24.44
...Valve body arm, 5.25.45...Valve swing support shaft,
6,46...Valve closing force member, 7,47...Receiving member,
8, 48... Supporting member, 9, 49... Holding member, 1
0, 30.50... Valve box lid, 11.12... Pipe end, a,... Inlet channel, b,... Outlet channel. Rod 31! II Procedural Amendment December 25, 1999
Claims (1)
吐出方向流れが慣性を失い停止する時点で、着座するよ
う弁部及びその付近の流路構造を相定め形成した逆止弁
を備えて構成させた無水撃揚水装置において、弁部（３
、４３）は、これに一体的に設けた弁体腕部（４、４４
）によって、弁揺動支持軸（５、４５）を介して、弁座
（２、４２）の出口側に臨んで揺動自在に装着され、そ
して、弁箱内において、弁箱内壁に設けた支持部材（８
、４８）によって支へられている弁閉力部材（６、４６
）を、それの保持部材（９、４９）を介して、弁体腕部
（４、４４）の弁揺動支持軸（５、４５）に近い位置に
設けた受け部材（７、４７）に、滑動自在に連節させた
ことにより、弁全開付近では、所要最小限の弁閉力とし
て作用させ、弁全閉付近では、所期最大限の弁閉力とし
て作用させる構成にしたことを特徴とするスイング型無
水撃逆止弁装置。 ２ 弁部（３、４３）は、出来る限り軽量な部材にて構
成すると共に、流れから受ける開く方向への力を軽減す
る形状に形成させた特許請求の範囲第１項記載のスイン
グ型無水撃逆止弁装置。[Scope of Claims] 1. The flow path structure of the valve part and its vicinity is adjusted so that when the input to the pump is cut off, the flow in the discharge direction in this pumping pipe loses inertia and stops. In the non-water hammer pumping device configured with the formed check valve, the valve part (3
, 43) is a valve body arm (4, 44) provided integrally therewith.
) is swingably mounted facing the outlet side of the valve seat (2, 42) via the valve swing support shaft (5, 45), and is mounted on the inner wall of the valve box within the valve box. Support member (8
, 48) supported by the valve closing force member (6, 46).
) to the receiving member (7, 47) provided at a position close to the valve swing support shaft (5, 45) of the valve body arm (4, 44) via its holding member (9, 49). By being slidably articulated, when the valve is fully open, the minimum required valve closing force is applied, and when the valve is fully closed, the desired maximum valve closing force is applied. Swing type non-water hammer check valve device. 2. The swing type waterless hammer according to claim 1, wherein the valve portion (3, 43) is made of a member that is as lightweight as possible and is formed in a shape that reduces the force in the opening direction received from the flow. Check valve device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15900489A JPH0324377A (en) | 1989-06-21 | 1989-06-21 | Swing type non-water-hammer check valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15900489A JPH0324377A (en) | 1989-06-21 | 1989-06-21 | Swing type non-water-hammer check valve device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0324377A true JPH0324377A (en) | 1991-02-01 |
Family
ID=15684136
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15900489A Pending JPH0324377A (en) | 1989-06-21 | 1989-06-21 | Swing type non-water-hammer check valve device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0324377A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018054A1 (en) * | 1994-12-05 | 1996-06-13 | Kabushiki Kaisha Yokota Seisakusho | Non-water hammering check valve device |
| WO1997038250A1 (en) * | 1996-04-09 | 1997-10-16 | Kabushiki Kaisha Yokota Seisakusho | Water-hammerless check valve |
| KR100300660B1 (en) * | 1999-01-22 | 2001-09-22 | 이영애 | Welder easy to join and disjoin electric line |
| KR20160130349A (en) * | 2016-10-21 | 2016-11-11 | 주식회사 제일테크 | High Efficient Ventilation by using of Backward Flow Preventing Damper for Air Supply and Exhaust and Storage Element |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54125530A (en) * | 1978-03-22 | 1979-09-29 | Yutaka Yamada | Nonnwater hammer little resistance check valve |
| JPS63297775A (en) * | 1987-05-28 | 1988-12-05 | Hidekuni Yokota | No-water hammer pumping device |
-
1989
- 1989-06-21 JP JP15900489A patent/JPH0324377A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54125530A (en) * | 1978-03-22 | 1979-09-29 | Yutaka Yamada | Nonnwater hammer little resistance check valve |
| JPS63297775A (en) * | 1987-05-28 | 1988-12-05 | Hidekuni Yokota | No-water hammer pumping device |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1996018054A1 (en) * | 1994-12-05 | 1996-06-13 | Kabushiki Kaisha Yokota Seisakusho | Non-water hammering check valve device |
| WO1997038250A1 (en) * | 1996-04-09 | 1997-10-16 | Kabushiki Kaisha Yokota Seisakusho | Water-hammerless check valve |
| GB2326217A (en) * | 1996-04-09 | 1998-12-16 | Yokota Mfg | Water-hammerless check valve |
| GB2326217B (en) * | 1996-04-09 | 2000-05-03 | Yokota Mfg | Water hammer preventing check valve |
| US6102072A (en) * | 1996-04-09 | 2000-08-15 | Kabushiki Kaisha Yokota Seisakusho | Water-hammerless check valve |
| KR100300660B1 (en) * | 1999-01-22 | 2001-09-22 | 이영애 | Welder easy to join and disjoin electric line |
| KR20160130349A (en) * | 2016-10-21 | 2016-11-11 | 주식회사 제일테크 | High Efficient Ventilation by using of Backward Flow Preventing Damper for Air Supply and Exhaust and Storage Element |
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