JPH1082475A - Dual plate check valve - Google Patents
Dual plate check valveInfo
- Publication number
- JPH1082475A JPH1082475A JP26023296A JP26023296A JPH1082475A JP H1082475 A JPH1082475 A JP H1082475A JP 26023296 A JP26023296 A JP 26023296A JP 26023296 A JP26023296 A JP 26023296A JP H1082475 A JPH1082475 A JP H1082475A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- seat
- seat ring
- plate check
- dual plate
- 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.)
- Granted
Links
Landscapes
- Check Valves (AREA)
- Details Of Valves (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する分野】この発明は、半円板状の２枚の弁
体を有するウェハータイプのデュアルプレート逆止弁に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wafer type dual plate check valve having two semi-disc-shaped valve bodies.
【０００２】[0002]
【従来の技術】従来、半円板状の２枚の弁体をバネで付
勢しつつ１本のヒンジピンによって弁箱に軸支し、常時
は弁体をバネの弾発力で閉弁位置に付勢、保持し、正常
流の流体圧力によって弁体をバネの弾発力に抗して開弁
位置に回動させて流体の流過を許容し、逆流が発生した
ときにはバネの弾発力と逆流圧力で弁体を閉弁するよう
にしたウェハータイプのデュアルプレート逆止弁は公知
であり、例えば特開平８−１６６０７２号公報、実開昭
５５−２２５１７号公報等に開示されている。2. Description of the Related Art Conventionally, two semi-disc-shaped valve bodies are supported by a single hinge pin on a valve box while being urged by a spring, and the valve body is normally closed at a valve closing position by the elastic force of the spring. The valve body is rotated to the valve-opening position against the spring force of the spring by the normal flow fluid pressure to allow the fluid to flow, and the spring springs when a backflow occurs. 2. Description of the Related Art A wafer type dual plate check valve in which a valve body is closed by force and backflow pressure is known, and is disclosed in, for example, JP-A-8-166072 and Japanese Utility Model Laid-Open No. 55-22517. .
【０００３】特開平８−１６６０７２号公報に開示され
たデュアルプレート逆止弁は、図１０に示すように略円
筒形状の弁箱(１)内に２枚の半円板状の弁体(２)を１本
のヒンジピン(３)で回動自在に軸支し、ヒンジピン(３)
に巻装したバネ(４)で弁体(２)を常時閉弁方向に付勢し
た構造である。しかしながらかかる公知のデュアルプレ
ート逆止弁では、弁箱(１)の入口若しくは出口の口径に
対して、弁座部の開口（面積）率に差があり、この差は
バルブ口径によって異なってはいるが一般的に入口口径
に対して弁座部の開口率は４０〜６０％となっている。
このため、弁座部において圧力損失が生じ、流体の種類
によっては少なからざる影響が生じてくる。また、弁座
部及び弁体の当接部が前記圧力損失の結果、高流速の流
体により摩耗、損傷されるおそれがあった。As shown in FIG. 10, a dual plate check valve disclosed in Japanese Patent Application Laid-Open No. H8-166072 has two semi-disc-shaped valve bodies (2) in a substantially cylindrical valve box (1). ) Is rotatably supported by one hinge pin (3), and the hinge pin (3)
The valve body (2) is normally urged in the valve closing direction by a spring (4) wound around. However, in such a known dual plate check valve, there is a difference in the opening (area) ratio of the valve seat portion with respect to the inlet or outlet diameter of the valve box (1), and this difference differs depending on the valve diameter. However, the opening ratio of the valve seat portion is generally 40 to 60% of the inlet diameter.
For this reason, pressure loss occurs in the valve seat portion, and there is considerable effect depending on the type of fluid. Further, as a result of the pressure loss, the contact portion between the valve seat and the valve element may be worn or damaged by the fluid having a high flow velocity.
【０００４】更に、従来の逆止弁においては、２枚の弁
体の全開から全閉までの回動角度が９０度となっている
ため、全開又は全閉時において弁体が急速に作動せず、
流体条件によっては弁体の作動が悪影響を受けるおそれ
が存している。また、流体が低圧の場合、弁体にかかる
圧力が小さいため開弁に時間がかかり、このためヒンジ
ピンより遠い弁体外周部から噴出している流体によって
外周部の摩耗、損傷を招来するおそれがあった。Further, in the conventional check valve, since the rotation angle from the fully opened state to the fully closed state of the two valve bodies is 90 degrees, the valve bodies operate rapidly when fully opened or fully closed. Without
Depending on the fluid conditions, the operation of the valve element may be adversely affected. In addition, when the fluid is at a low pressure, it takes a long time to open the valve because the pressure applied to the valve body is small, so that the fluid ejected from the outer periphery of the valve body farther than the hinge pin may cause wear and damage of the outer periphery. there were.
【０００５】次に、従来のこの種逆止弁にあっては、シ
ール性の確保、騒音防止等のため弁体と弁座の着座部の
材質は、金属と弾性体の組合せとしているが、弾性体の
質量（ボリューム）はあまり大きく形成することが出来
ず、この結果弾性体の摩耗、剥離或いは脱落等の損傷の
おそれがあった。また、弁体の回動軸であるヒンジピン
及び該ピンを軸支する弁箱並びに軸受部は、長年に亘っ
て流体と接触している結果、摩耗、損傷を受けるおそれ
があった。[0005] Next, in this type of conventional check valve, the material of the seat of the valve body and the valve seat is a combination of metal and an elastic body in order to ensure sealing performance and prevent noise. The mass (volume) of the elastic body could not be formed so large, and as a result, there was a possibility that the elastic body might be damaged such as abrasion, peeling or falling off. In addition, the hinge pin, which is the rotation axis of the valve element, and the valve box and bearing that pivotally support the pin have been in contact with fluid for many years, and as a result, may be worn or damaged.
【０００６】実開昭５５−２２５１７号公報に開示され
ている逆止弁は、弁体を弾性体で構成して弁体の可撓性
によりスイングして流体を通過させ或いは逆流を阻止す
るようにし、弁体のスイングストロークを従来のものの
２分の１とすることにより、弁体の作動の遅れを防止し
ようとしている。しかしながら、弁体を弾性体で形成す
ることは実際的でなく、製造が困難になると共に、２枚
の金属製の弁体を用いるデュアルプレート逆止弁とは技
術上の目的を異にするものである。The check valve disclosed in Japanese Utility Model Laid-Open Publication No. 55-22517 discloses a structure in which a valve body is made of an elastic body and swings due to the flexibility of the valve body to allow fluid to pass therethrough or to prevent backflow. The delay of the operation of the valve body is prevented by reducing the swing stroke of the valve body to half that of the conventional one. However, it is not practical to form the valve body with an elastic body, making it difficult to manufacture, and having a different technical purpose from a dual-plate check valve using two metal valve bodies. It is.
【０００７】[0007]
【発明が解決しようとする課題】この発明は、弁の開閉
時間を短縮し得ると共に、閉弁時に弁体全体を同時に着
座させて着座部の保護を図り得るようにしたデュアルプ
レート逆止弁を提供せんとするものである。SUMMARY OF THE INVENTION The present invention provides a dual plate check valve which can shorten the opening / closing time of a valve and protect the seating portion by simultaneously seating the entire valve body when the valve is closed. It will not be provided.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決するため
にこの発明が採った手段は、剛性材料からなる中空円筒
状の弁箱内周面に、弾性材料からなる円筒状のシートリ
ングを装着し、弁箱内に直径方向に軸支されたヒンジピ
ンに剛性材料からなる半円板状の２枚の弁体をバネで常
時閉弁方向に付勢しつつ回動自在に軸支し、該弁体が着
座するシートリングの弁座面を流体の流過方向に傾斜し
て形成したことを特徴とする。In order to solve the above-mentioned problems, the present invention adopts a method in which a cylindrical seat ring made of an elastic material is mounted on the inner peripheral surface of a hollow cylindrical valve box made of a rigid material. Then, two semi-disc-shaped valve bodies made of a rigid material are rotatably supported while being constantly biased in a valve closing direction by a spring on a hinge pin which is supported in a diametrical direction in the valve box. The valve seat surface of the seat ring on which the valve element is seated is formed so as to be inclined in the direction in which the fluid flows.
【０００９】また、弁座面の傾斜角度を、１０〜３０
度、好ましくは１５度内外としたことを特徴とする。In addition, the inclination angle of the valve seat surface is set to 10 to 30.
Degrees, preferably 15 degrees.
【００１０】更に、シートリングのヒンジピン軸支部近
傍の弁座面を平面弁座としたことを特徴とする。[0010] Furthermore, the valve seat surface near the hinge pin shaft support portion of the seat ring is a flat valve seat.
【００１１】更に、シートリングを弁箱とは別体に形成
し、弁箱内に挿嵌して固着し、或いはシートリングを弁
箱内に一体加硫成形したことを特徴とする。Further, the seat ring is formed separately from the valve box, and is inserted and fixed in the valve box, or the seat ring is integrally vulcanized in the valve box.
【００１２】[0012]
【発明の実施の形態】この発明の好ましい実施の形態
を、以下に詳細に説明する。図において(１)は、円筒形
状の弁箱であって、円筒状の流路(５)が貫通して形成さ
れており、配管パイプのフランジ間に狭持して配設され
るウェハータイプの構造を有している。弁箱(１)の流路
入口(６)の中央には、弁箱(１)を直径方向に横断してヒ
ンジピン(３)と平行に中央リブ(８)が配設されており、
該中央リブ(８)は弁座面より入口側に突出している。中
央リブ(８)と平行に延びるヒンジピン(３)には、半円板
状の弁体(２)が回動自在に軸支される。弁体(２)は、ヒ
ンジピン(３)に巻装されたバネ(４)の弾発力を受けて常
時閉弁する方向に付勢されている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described in detail below. In the figure, (1) is a cylindrical valve box having a cylindrical flow path (5) formed therethrough, and a wafer-type valve box which is disposed to be sandwiched between flanges of piping pipes. It has a structure. A central rib (8) is disposed in the center of the flow path inlet (6) of the valve box (1) in parallel with the hinge pin (3) across the valve box (1) in the diameter direction,
The central rib (8) projects from the valve seat surface toward the inlet. A semi-disc-shaped valve element (2) is rotatably supported on a hinge pin (3) extending parallel to the central rib (8). The valve element (2) is urged in a direction in which it is normally closed by receiving the elastic force of a spring (4) wound around the hinge pin (3).
【００１３】(９)は、前記弁箱(１)の内周面に装着され
たシートリングであって、ゴム、軟弾性の合成樹脂等の
弾性体からなる円筒形状を有し、弁箱(１)の内周面に流
路(５)の出口側から挿着され、固定される。シートリン
グ(９)は、弁箱(１)の流路口径と実質的に同一の内径を
有しており、シートリング(９)により圧力損失が発生し
ないようにされている。シートリング(９)は、弁箱(１)
の長さより短い軸方向寸法に形成され、シートリング
(９)の入口側は、弁箱(１)の入口で保護された状態にあ
り、流入する流体圧がシートリングの入り口端に付加さ
れて、シートリング(９)が剥離することがないようにし
てある。(9) A seat ring mounted on the inner peripheral surface of the valve box (1), having a cylindrical shape made of an elastic body such as rubber, soft elastic synthetic resin or the like. It is inserted and fixed to the inner peripheral surface of 1) from the outlet side of the flow path (5). The seat ring (9) has an inner diameter substantially the same as the diameter of the flow path of the valve box (1), so that pressure loss does not occur due to the seat ring (9). Seat ring (9), valve box (1)
Formed to an axial dimension shorter than the length of the seat ring
The inlet side of (9) is protected by the inlet of the valve box (1), so that the inflowing fluid pressure is applied to the inlet end of the seat ring so that the seat ring (9) does not peel off. It is.
【００１４】シートリング(９)の内周面には、弁体(２)
が着座する弁座面(10)がシートリング(９)の内周面を凹
設した段部によって形成される。該弁座面(10)は、流路
に対して直角ではなく、流過方向に１０〜３０度、好ま
しくは１５度内外の傾斜した角度で形成されている。こ
れにより、弁体(２)の全周面を同時に弁座(９)に着座さ
せることが出来ると共に、弁体(２)の開閉応答時間を短
縮することが可能となる。該弁座面(10)は、図５〜９に
示すように断面台形の斜面で、ヒンジピン(３)と平行な
弁座部も同様傾斜しており、弁体の先端に至るまで断面
台形の弁座部は暫時拡大されている。シートリング(９)
は、弁箱(１)とは別体の形成され弁箱内に挿嵌して固着
しても、或いは一体に加硫焼付して固着しても良い。い
ずれの方法によりシートリングを固着するかは、弁の口
径に応じて適宜選択する。シートリング(９)の硬度は、
ＪＩＳ・Ａスプリング硬さでＨｓ７０〜９０、好ましく
はＨｓ８０内外である。A valve body (2) is provided on the inner peripheral surface of the seat ring (9).
The seat surface (10) on which the seat is seated is formed by a stepped portion formed by recessing the inner peripheral surface of the seat ring (9). The valve seat surface (10) is formed not at a right angle to the flow path but at an inclined angle of 10 to 30 degrees, preferably 15 degrees in the flow direction. Thus, the entire peripheral surface of the valve element (2) can be simultaneously seated on the valve seat (9), and the opening / closing response time of the valve element (2) can be shortened. The valve seat surface (10) has a trapezoidal cross section as shown in FIGS. 5 to 9, and the valve seat portion parallel to the hinge pin (3) is similarly inclined, and has a trapezoidal cross section up to the tip of the valve body. The valve seat has been temporarily expanded. Seat ring (9)
May be formed separately from the valve box (1) and fixed by inserting into the valve box, or may be fixed by vulcanization and baking integrally. Which method is used to fix the seat ring is appropriately selected according to the diameter of the valve. The hardness of the seat ring (9)
JIS A spring hardness is Hs 70 to 90, preferably Hs 80.
【００１５】シートリング(９)の外周面には、弁箱(１)
の内周面の段部に係止する傾斜凸部(11)が設けられてお
り、弁体(２)が弁座面(10)に着座したときの面圧並びに
衝撃を吸収するようにしてある。On the outer peripheral surface of the seat ring (9), a valve box (1)
An inclined convex portion (11) is provided to be locked to the step on the inner peripheral surface of the valve so that the valve body (2) absorbs the surface pressure and impact when the valve body (2) is seated on the valve seat surface (10). is there.
【００１６】中央リブ(８)と平行なヒンジピン(３)及び
ストッパーピン(12)がシートリング(９)の内周面に平面
弁座(13)を形成し、該平面弁座(13)に鍔付軸受(14)を挿
嵌し、該鍔付軸受(14)の鍔部を平面当たりとすることに
より、弁体(２)の開閉時における振動、衝撃等を吸収、
緩和し、該ピンの軸方向の移動を防止すると共に、プラ
グ(15)で固着している。A hinge pin (3) and a stopper pin (12) parallel to the central rib (8) form a flat valve seat (13) on the inner peripheral surface of the seat ring (9). By inserting the flanged bearing (14) and making the flange portion of the flanged bearing (14) flat, it absorbs vibration, impact, etc. when opening and closing the valve body (2).
The pin is relaxed to prevent the pin from moving in the axial direction, and is fixed by the plug (15).
【００１７】弁体(２)は、基部に形成された複数のラグ
部(16)によりヒンジピン(３)に回動自在に軸支され、流
路入口(６)から流入した流体圧力で流路出口方向に回動
され開弁して流路(５)を開放する。ラグ部(16)の当接面
には、座金が配在され、軸方向へのがたつきを防止し、
確実な着座シールを実現している。この発明の逆止弁で
は、シートリング(９)の内径が流路口径と一致してお
り、弁座部の開口率が縮小されることがない。弁体(２)
を閉弁方向に付勢するバネ(４)は、その短軸側自由端を
ストッパーピン(12)に係止し、バネ巻線部をヒンジピン
(３)の中央部に巻装し、長軸側自由端を弁体(２)の背面
に係止して弾発力を弁体に付加している。The valve body (2) is rotatably supported on a hinge pin (3) by a plurality of lugs (16) formed on a base portion, and the flow path is formed by a fluid pressure flowing from a flow path inlet (6). It is rotated in the direction of the outlet and opened to open the flow path (5). Washers are arranged on the contact surface of the lug (16) to prevent rattling in the axial direction,
A secure seating seal is achieved. In the check valve of the present invention, the inner diameter of the seat ring (9) matches the diameter of the flow passage, and the opening ratio of the valve seat is not reduced. Valve body (2)
The spring (4) for urging the spring in the valve closing direction locks its free end on the short axis side to the stopper pin (12), and connects the spring winding to the hinge pin.
It is wound around the center of (3), and the free end on the long axis side is locked to the back surface of the valve body (2) to apply elastic force to the valve body.
【００１８】[0018]
【発明の効果】この発明によれば、弁箱の入口径に対
する弁座径の開口率に差がないため、流体通過部におけ
る急激な断面変化をなくすことが出来、スムースな層流
の実現を図ることが出来る。According to the present invention, since there is no difference in the opening ratio of the valve seat diameter with respect to the inlet diameter of the valve box, it is possible to eliminate a sudden cross-sectional change in the fluid passage portion and realize a smooth laminar flow. I can plan.
【００１９】弁座面を流体の流過方向に傾斜して形成
してあるため、弁体の閉弁応答時間を３０％程度短縮す
ることが出来る。また、弁体の全周面がシートリングに
同時に着座するため、迅速な閉弁を図ることが出来る。
弁体は弾性材料のシートリングに着座するため、弁体着
座時の衝撃音や異音等の発生を防止することが出来、弁
体をソフトなタッチで弁座面に着座させうる。Since the valve seat surface is formed to be inclined in the direction in which the fluid flows, the valve closing response time of the valve body can be reduced by about 30%. Further, since the entire peripheral surface of the valve body is simultaneously seated on the seat ring, quick valve closing can be achieved.
Since the valve element is seated on the seat ring made of the elastic material, it is possible to prevent the occurrence of impact noise, abnormal noise, and the like when the valve element is seated, and to seat the valve element on the valve seat surface with a soft touch.
【００２０】シートリング内周面に平面弁座をを形成
してあるので、ヒンジピンの軸受部が流体による振動で
損傷されるのを防止することが出来る。Since the flat valve seat is formed on the inner peripheral surface of the seat ring, it is possible to prevent the bearing portion of the hinge pin from being damaged by vibration due to fluid.
【図１】この発明にかかる逆止弁の正面図FIG. 1 is a front view of a check valve according to the present invention.
【図２】同断面図FIG. 2 is a sectional view of the same.
【図３】シートリングの斜視図FIG. 3 is a perspective view of a seat ring.
【図４】シートリングの断面斜視図FIG. 4 is a sectional perspective view of a seat ring.
【図５】図１Ａ−Ａ’線に沿ったシートリングの断面図FIG. 5 is a cross-sectional view of the seat ring taken along the line A-A 'of FIG. 1;
【図６】図５Ｂ−Ｂ’線に沿った断面図FIG. 6 is a sectional view taken along the line B-B 'of FIG. 5;
【図７】図５Ｃ−Ｃ’線に沿った断面図FIG. 7 is a sectional view taken along the line C-C 'of FIG. 5;
【図８】図５Ｄ−Ｄ’線に沿った断面図FIG. 8 is a sectional view taken along the line D-D ′ of FIG. 5;
【図９】図５Ｅ−Ｅ’線に沿った断面図FIG. 9 is a sectional view taken along the line E-E ′ of FIG. 5;
【図１０】従来の逆止弁の断面図FIG. 10 is a sectional view of a conventional check valve.
(１)弁箱 (２)弁体 (３)ヒンジピン (４)バネ (５)流路 (６)流路入口 (７)流路出口 (８)中央リブ (９)シートリング (10)弁座面 (11)傾斜凸部 (12)ストッパーピン (13)平面弁座 (14)鍔付弁座 (15)プラグ (16)ラグ部 (1) Valve box (2) Valve body (3) Hinge pin (4) Spring (5) Flow path (6) Flow path inlet (7) Flow path outlet (8) Central rib (9) Seat ring (10) Valve seat Surface (11) Inclined protrusion (12) Stopper pin (13) Flat valve seat (14) Flanged valve seat (15) Plug (16) Lug
Claims (6)
に、弾性材料からなる円筒状のシートリングを装着し、
弁箱内に直径方向に軸支されたヒンジピンに剛性材料か
らなる半円板状の２枚の弁体をバネで常時閉弁方向に付
勢しつつ回動自在に軸支し、該弁体が着座するシートリ
ングの弁座面を流体の流過方向に傾斜して形成したこと
を特徴とするデュアルプレート逆止弁。1. A cylindrical seat ring made of an elastic material is mounted on an inner peripheral surface of a hollow cylindrical valve box made of a rigid material.
Two semi-disc-shaped valve bodies made of a rigid material are rotatably supported while being constantly biased in a valve closing direction by a spring on a hinge pin which is supported in a diametrical direction in a valve box. A dual plate check valve characterized in that a valve seat surface of a seat ring on which is seated is formed so as to be inclined in a fluid flowing direction.
ことを特徴とする請求項１記載のデュアルプレート逆止
弁。2. The dual plate check valve according to claim 1, wherein the inclination angle of the valve seat surface is 10 to 30 degrees.
とを特徴とする請求項２記載のデュアルプレート逆止
弁。3. The dual plate check valve according to claim 2, wherein the inclination angle of the valve seat surface is 15 degrees.
座面を平面弁座としたことを特徴とする請求項１乃至３
のいずれかに記載のデュアルプレート逆止弁。4. A flat valve seat, wherein a valve seat surface near a hinge pin shaft support of a seat ring is a flat valve seat.
The dual plate check valve according to any one of the above.
箱内に挿嵌して固着したことを特徴とする請求項１乃至
４のいずれかに記載のデュアルプレート逆止弁。5. The dual plate check valve according to claim 1, wherein the seat ring is formed separately from the valve box, and is fitted and fixed in the valve box.
ことを特徴とする請求項１乃至４のいずれかに記載のデ
ュアルプレート逆止弁。6. A dual plate check valve according to claim 1, wherein the seat ring is integrally vulcanized in the valve box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08260232A JP3121546B2 (en) | 1996-09-09 | 1996-09-09 | Dual plate check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP08260232A JP3121546B2 (en) | 1996-09-09 | 1996-09-09 | Dual plate check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1082475A true JPH1082475A (en) | 1998-03-31 |
| JP3121546B2 JP3121546B2 (en) | 2001-01-09 |
Family
ID=17345197
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP08260232A Expired - Fee Related JP3121546B2 (en) | 1996-09-09 | 1996-09-09 | Dual plate check valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3121546B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008058454A1 (en) * | 2006-11-16 | 2008-05-22 | Neway Valve (Suzhou) Co., Ltd | A counter-clamping check valve of double valve flaps |
| KR200448982Y1 (en) | 2007-10-02 | 2010-06-09 | 오찬세 | Double plate check valve |
| CN105179756A (en) * | 2015-08-18 | 2015-12-23 | 中节能先导城市节能有限公司 | Double-tilting-clack side-dump type energy-saving check valve |
| CN107166046A (en) * | 2017-05-03 | 2017-09-15 | 苏州纽威阀门股份有限公司 | A kind of fixed structure, Double-disc type check valve and its assembly technology |
| CN114810311A (en) * | 2021-01-27 | 2022-07-29 | 双叶产业株式会社 | Valve device |
-
1996
- 1996-09-09 JP JP08260232A patent/JP3121546B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008058454A1 (en) * | 2006-11-16 | 2008-05-22 | Neway Valve (Suzhou) Co., Ltd | A counter-clamping check valve of double valve flaps |
| KR200448982Y1 (en) | 2007-10-02 | 2010-06-09 | 오찬세 | Double plate check valve |
| CN105179756A (en) * | 2015-08-18 | 2015-12-23 | 中节能先导城市节能有限公司 | Double-tilting-clack side-dump type energy-saving check valve |
| CN107166046A (en) * | 2017-05-03 | 2017-09-15 | 苏州纽威阀门股份有限公司 | A kind of fixed structure, Double-disc type check valve and its assembly technology |
| CN114810311A (en) * | 2021-01-27 | 2022-07-29 | 双叶产业株式会社 | Valve device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3121546B2 (en) | 2001-01-09 |
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