JP3005215B1 - Check valve - Google Patents

Check valve

Info

Publication number
JP3005215B1
JP3005215B1 JP36750798A JP36750798A JP3005215B1 JP 3005215 B1 JP3005215 B1 JP 3005215B1 JP 36750798 A JP36750798 A JP 36750798A JP 36750798 A JP36750798 A JP 36750798A JP 3005215 B1 JP3005215 B1 JP 3005215B1
Authority
JP
Japan
Prior art keywords
cylinder
passage
valve body
valve
fluid
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
Application number
JP36750798A
Other languages
Japanese (ja)
Other versions
JP2000193109A (en
Inventor
哲郎 原田
Original Assignee
石川島検査計測株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 石川島検査計測株式会社 filed Critical 石川島検査計測株式会社
Priority to JP36750798A priority Critical patent/JP3005215B1/en
Application granted granted Critical
Publication of JP3005215B1 publication Critical patent/JP3005215B1/en
Publication of JP2000193109A publication Critical patent/JP2000193109A/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Landscapes

  • Check Valves (AREA)

Abstract

【要約】 【課題】 スラリー等の流動体を用いても頻繁に清掃す
る必要のない逆止弁を提供する。 【解決手段】 内部が第１円筒２と第２円筒３と第３円
筒４の３段付円筒空間を有し、各円筒の直径は、第１円
筒直径ｄ１＜第２円筒直径ｄ２＜第３円筒直径ｄ３であ
る本体１と、第２円筒３と嵌合する円筒体であって、第
３円筒側の外周に円周状のシール６を有し、内部に空間
７を有しこの空間より第１円筒２に通ずる第１通路８と
シール６より第１円筒側の側面に通ずる第２通路９とを
有する弁体５と、を備える。A check valve that does not need to be cleaned frequently even when a fluid such as a slurry is used. SOLUTION: The interior has a three-stage cylindrical space of a first cylinder 2, a second cylinder 3, and a third cylinder 4, and the diameter of each cylinder is as follows: first cylinder diameter d1 <second cylinder diameter d2 <third cylinder diameter. A cylindrical body fitted with the main body 1 having a cylindrical diameter d3 and the second cylindrical body 3, having a circumferential seal 6 on the outer periphery of the third cylindrical side, and having a space 7 therein; The valve body 5 includes a first passage 8 that communicates with the first cylinder 2 and a second passage 9 that communicates from the seal 6 to a side surface on the first cylinder side.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、逆止弁に係わり、
特にスラリー等の流動体を通しても詰まり難い逆止弁に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve,
In particular, the present invention relates to a check valve which is hardly clogged even through a fluid such as a slurry.

【０００２】[0002]

【従来の技術】図９は往復動ポンプに逆止弁を用いた例
を示す。往復動ポンプは、シリンダ２０内をピストン２
１が往復動する。シリンダ２０の端部には吸入口２２と
吐出口２３が設けられており、それぞれ逆止弁２４、２
５が図に示す向きに取付けられている。ピストン２１が
図で左側に移動するとき吸入口２２の逆止弁２４が開い
て液体を吸入し、吐出口２３の逆止弁２５は閉じてい
る。右側に移動するとき吸入口２２の逆止弁２４は閉
じ、吐出口２３の逆止弁２５は開いて液体を吐出する。2. Description of the Related Art FIG. 9 shows an example in which a check valve is used for a reciprocating pump. The reciprocating pump has a piston 2 in the cylinder 20.
1 reciprocates. A suction port 22 and a discharge port 23 are provided at an end of the cylinder 20, and check valves 24, 2
5 are mounted in the direction shown in the figure. When the piston 21 moves to the left in the figure, the check valve 24 of the suction port 22 is opened to suck the liquid, and the check valve 25 of the discharge port 23 is closed. When moving to the right, the check valve 24 of the suction port 22 closes and the check valve 25 of the discharge port 23 opens to discharge the liquid.

【０００３】[0003]

【発明が解決しようとする課題】しかしかかる往復動ポ
ンプでスラリー等の流動体を移送する場合、バネ等で付
勢された球が通路を閉鎖する従来の逆止弁を用いると、
球接する通路にスラリーの粒子が付着し、弁としての閉
鎖機能が劣化し逆圧時漏れが発生するため、頻繁に清掃
する必要があった。However, when a fluid such as slurry is transferred by such a reciprocating pump, if a conventional check valve in which a ball urged by a spring or the like closes a passage is used,
Slurry particles adhere to the passage in contact with the sphere, deteriorating the closing function of the valve and causing leakage at the time of reverse pressure, so that frequent cleaning was required.

【０００４】本発明は上述の問題点に鑑みてなされたも
ので、スラリー等の流動体を用いても頻繁に清掃する必
要のない逆止弁を提供することを目的とする。The present invention has been made in view of the above problems, and has as its object to provide a check valve which does not need to be cleaned frequently even when a fluid such as slurry is used.

【０００５】[0005]

【課題を解決するための手段】上記目的を達成するた
め、請求項１の発明では、内部が第１円筒と第２円筒と
第３円筒の３段付円筒空間を有し、各円筒の直径は、第
１円筒直径ｄ１＜第２円筒直径ｄ２＜第３円筒直径ｄ３
である本体と、前記第２円筒と嵌合する円筒体であっ
て、第３円筒側の外周に円周状のシールを有し、内部に
空間を有しこの空間より第１円筒に通ずる第１通路と前
記シールより第１円筒側の側面に通ずる第２通路とを有
する弁体と、を備える。In order to achieve the above object, according to the first aspect of the present invention, the interior has a three-stage cylindrical space of a first cylinder, a second cylinder, and a third cylinder, and the diameter of each cylinder is three. Is the first cylinder diameter d1 <the second cylinder diameter d2 <the third cylinder diameter d3
And a cylindrical body fitted with the second cylinder, having a circumferential seal on the outer periphery of the third cylinder side, having a space inside, and a third body passing from the space to the first cylinder. A valve body having one passage and a second passage leading to a side surface of the seal closer to the first cylinder.

【０００６】弁体が第２円筒内にある状態で第３円筒側
から弁体に流体圧が加わる場合、シールによって第１円
筒への流体の流れは阻止され、弁体の移動は第１円筒に
より阻止される。弁体の第２通路が第３円筒内にある状
態で第３円筒側から弁体に流体圧が加わる場合、第２通
路が第２円筒に入るまでは流体が第３円筒側から第１円
筒に流れるが、第２円筒に入ってしまえばシールによっ
て第１円筒への流体の流れは阻止され、弁体の移動は第
１円筒に当たり停止する。弁体が第２円筒内にある状態
で第１円筒側から流体圧がかかると、弁体は第３円筒側
へ移動し、弁体の第２通路が第３円筒内に入ると、流体
が第１円筒、第１通路、空間、第２通路を通り第３円筒
に流入し、第１円筒と第３円筒が連通する。これにより
逆止弁としての機能が発揮される。When fluid pressure is applied to the valve body from the third cylinder side while the valve body is in the second cylinder, the flow of fluid to the first cylinder is blocked by the seal and the movement of the valve body is restricted to the first cylinder. Is blocked by When fluid pressure is applied to the valve body from the third cylinder side while the second passage of the valve body is in the third cylinder, fluid flows from the third cylinder side to the first cylinder side until the second passage enters the second cylinder. However, once the fluid enters the second cylinder, the flow of fluid to the first cylinder is blocked by the seal, and the movement of the valve body hits the first cylinder and stops. When the fluid pressure is applied from the first cylinder side while the valve body is in the second cylinder, the valve body moves to the third cylinder side, and when the second passage of the valve body enters the third cylinder, the fluid flows. It flows into the third cylinder through the first cylinder, the first passage, the space, and the second passage, and the first cylinder and the third cylinder communicate with each other. Thereby, the function as a check valve is exhibited.

【０００７】請求項２の発明では、前記弁体と第３円筒
との間には弁体を第１円筒側に復帰させる第１バネが設
けられている。According to the second aspect of the present invention, a first spring for returning the valve body to the first cylinder side is provided between the valve body and the third cylinder.

【０００８】このように第１バネを設けることにより、
弁体の第２通路が第３円筒内にある状態で第１円筒側か
らの流体圧が減少すると、第１バネにより弁体は第２円
筒内に復帰するので、第３円筒側から流体圧がかかって
も第１円筒側に漏れる流体は少くなる。By providing the first spring in this manner,
When the fluid pressure from the first cylinder decreases while the second passage of the valve body is in the third cylinder, the valve body returns to the second cylinder by the first spring. However, the amount of fluid that leaks to the first cylinder side is reduced.

【０００９】請求項３の発明では、前記弁体の空間には
前記第１通路を閉塞する球と、この球を第１通路に押し
付ける第２バネとが設けられている。According to the third aspect of the present invention, a sphere for closing the first passage and a second spring for pressing the sphere against the first passage are provided in the space of the valve body.

【００１０】弁体が第２円筒内にある状態で第３円筒側
から弁体に流体圧が加わる場合、シールによって第１円
筒への流体の流れは阻止され、弁体の移動は第１円筒に
より阻止される。弁体が第２円筒内にあるときに、第１
円筒側から流体圧がかかると、弁体は第３円筒側へ移動
し、弁体の第２通路が第３円筒内に入ると、第２通路か
らの背圧がなくなるので球が第２バネに抗して第１通路
から離れ、流体が第１円筒、第１通路、空間、第２通路
を通り第３円筒に流入し、第１円筒と第３円筒が連通す
る。また、弁体の第２通路が第３円筒内にあり、第１円
筒側からの流体圧が弱まると第２バネが働いて球が第１
通路を閉塞するので、第３円筒側から流体圧が加わって
も、請求項１のように、弁体の第２通路が第２円筒に入
るまでの間に、流体が第３円筒、第２通路、空間、第１
通路を通り第１円筒に漏れることはない。これにより逆
止弁としての機能が発揮される。When fluid pressure is applied to the valve body from the third cylinder side while the valve body is in the second cylinder, the flow of fluid to the first cylinder is prevented by the seal, and the movement of the valve body is restricted to the first cylinder. Is blocked by When the valve body is in the second cylinder, the first
When the fluid pressure is applied from the cylinder side, the valve body moves to the third cylinder side, and when the second passage of the valve body enters the third cylinder, the back pressure from the second passage disappears, so that the ball is moved by the second spring. Away from the first passage, the fluid flows into the third cylinder through the first cylinder, the first passage, the space, and the second passage, and the first cylinder and the third cylinder communicate with each other. Further, the second passage of the valve body is in the third cylinder, and when the fluid pressure from the first cylinder side weakens, the second spring operates to move the ball to the first cylinder.
Since the passage is closed, even if the fluid pressure is applied from the third cylinder side, the fluid flows through the third cylinder and the second cylinder until the second passage of the valve element enters the second cylinder as in claim 1. Passage, space, 1st
It does not leak into the first cylinder through the passage. Thereby, the function as a check valve is exhibited.

【００１１】請求項４の発明では、前記弁体が第３円筒
側に移動したとき弁体が第２円筒から外れないように移
動を阻止するスットパが前記第３円筒に設けられてい
る。In the fourth aspect of the present invention, the stop cylinder is provided on the third cylinder so as to prevent the valve body from moving off the second cylinder when the valve body moves to the third cylinder side.

【００１２】第２通路が第３円筒内に全て入った後に弁
体の第３円筒側の端部が当たるストッパを設けることに
より、弁体が第２円筒から飛び出すのを防止できる。By providing a stopper against which the end of the valve body on the third cylinder side comes into contact after the second passage has completely entered the third cylinder, the valve body can be prevented from jumping out of the second cylinder.

【００１３】[0013]

【発明の実施の形態】以下本発明の実施形態について図
面を参照して説明する。図１は第１実施形態の逆止弁の
構成を示す図であり、（Ａ）は断面図、（Ｂ）は（Ａ）
のＸ−Ｘ矢視図である。１は逆止弁の本体で、第１円筒
２、第２円筒３、第３円筒４からなる段付き円筒状の空
間が設けられている。第１円筒の直径をｄ１，第２円筒
の直径をｄ２，第３円筒の直径をｄ３とすると、ｄ１＜
ｄ２＜ｄ３の寸法になっている。５は弁体で第２円筒３
より少し小さい直径の円筒で、長さはほぼ第２円筒３と
同じであり、第２円筒３に嵌合している。弁体５の第３
円筒４側の外周にはＯリング用溝６ａが設けられ、Ｏリ
ング６が装着されている。Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are diagrams showing a configuration of a check valve according to a first embodiment, wherein FIG. 1A is a cross-sectional view, and FIG.
FIG. Reference numeral 1 denotes a main body of the check valve, which is provided with a stepped cylindrical space including a first cylinder 2, a second cylinder 3, and a third cylinder 4. Assuming that the diameter of the first cylinder is d1, the diameter of the second cylinder is d2, and the diameter of the third cylinder is d3, d1 <
d2 <d3. 5 is a valve body and a second cylinder 3
A slightly smaller diameter cylinder, approximately the same length as the second cylinder 3, and fits over the second cylinder 3. Third of valve element 5
An O-ring groove 6a is provided on the outer periphery of the cylinder 4 side, and the O-ring 6 is mounted.

【００１４】弁体５の内部には円筒形で下部が円錐状の
空間７が設けられ、円錐状の底部には第１円筒２に導通
する第１通路８が設けられている。また円筒７の円筒部
にはＯリング用溝６ａより第１円筒側の側外面に導通す
る第２通路９が設けられている。第３円筒４にはストッ
パ１０が設けられ、弁体５が第３円筒４内に移動しても
第２円筒３から抜けないようになっている。また第２円
筒３の第３円筒４側の角ａは丸くなっており、Ｏリング
６が摺動しても傷つかないようになっている。A space 7 having a cylindrical shape and a conical bottom is provided inside the valve body 5, and a first passage 8 communicating with the first cylinder 2 is provided at a bottom of the conical shape. The cylindrical portion of the cylinder 7 is provided with a second passage 9 that conducts from the O-ring groove 6a to the outer surface on the first cylindrical side. A stopper 10 is provided on the third cylinder 4 so that the valve body 5 does not fall out of the second cylinder 3 even when the valve body 5 moves into the third cylinder 4. The corner a of the second cylinder 3 on the third cylinder 4 side is rounded so that the O-ring 6 is not damaged even if it slides.

【００１５】次に図１〜図３を用いて動作を説明する。
図１に示すように弁体５が第２円筒３内にあり、第３円
筒４側から流体圧が加わる場合、流体はＯリング６によ
り阻止されるので第１円筒２へ流れない。また弁体５は
第１円筒２に当たるので移動しない。図１の状態で第１
円筒２側より流体圧が加わると、弁体５は第３円筒４側
に移動し、図２に示すように弁体５の第２通路９が第３
円筒４内に入ると、第１円筒２、第１通路８、空間７、
第２通路９を通り、流体が第３円筒４へ流れる。弁体５
はストッパ１０に当たり停止する。弁体５がこの位置で
流体圧が図３に示すように第３円筒４側からかかると、
流体が第３円筒４、第２通路９、空間７、第１通路８を
通り第１円筒２に流れるが、弁体５が移動し第２通路９
が第２円筒３内に入れば、これらの流路は閉鎖されるの
で、この流れによる流体の漏れは僅かである。弁体５が
第１円筒２に当たると停止する。なお、Ｏリング６は第
２円筒３と摺動する際、第２円筒３に付着する粒子等を
除去する働きをするので、スラリーのような流動体に適
した逆止弁となっている。Next, the operation will be described with reference to FIGS.
As shown in FIG. 1, when the valve element 5 is in the second cylinder 3 and a fluid pressure is applied from the third cylinder 4 side, the fluid is blocked by the O-ring 6 and does not flow to the first cylinder 2. Also, the valve body 5 does not move because it comes into contact with the first cylinder 2. 1 in the state of FIG.
When fluid pressure is applied from the cylinder 2 side, the valve body 5 moves to the third cylinder 4 side, and the second passage 9 of the valve body 5
Once inside the cylinder 4, the first cylinder 2, the first passage 8, the space 7,
The fluid flows to the third cylinder 4 through the second passage 9. Valve 5
Hits the stopper 10 and stops. When the fluid pressure is applied from the third cylinder 4 side as shown in FIG.
Fluid flows into the first cylinder 2 through the third cylinder 4, the second passage 9, the space 7, and the first passage 8, but the valve element 5 moves and the second passage 9
When the fluid enters the second cylinder 3, these flow paths are closed, and the leakage of the fluid due to this flow is slight. When the valve body 5 hits the first cylinder 2, it stops. When the O-ring 6 slides on the second cylinder 3, the O-ring 6 functions to remove particles and the like adhering to the second cylinder 3, so that the O-ring 6 is a check valve suitable for a fluid such as slurry.

【００１６】次に第２実施形態を説明する。図４、図５
は第２実施形態を示す。第２実施形態は図１に示す第１
実施形態に対し、弁体５とストッパ１０との間に第１バ
ネ１１を設けた点が相違し他は同じである。なおスット
パ１０は第１バネ１１を安定して支えるため４個にして
いる。図４は第２実施形態の逆止弁の構成を示し、
（Ａ）は断面図、（Ｂ）は（Ａ）のＹ−Ｙ矢視図であ
る。図５は図４の状態から弁体５が移動した状態を示
す。Next, a second embodiment will be described. 4 and 5
Shows a second embodiment. The second embodiment corresponds to the first embodiment shown in FIG.
The embodiment is different from the embodiment in that a first spring 11 is provided between a valve body 5 and a stopper 10, and the other parts are the same. The number of stoppers 10 is four in order to stably support the first spring 11. FIG. 4 shows a configuration of a check valve according to the second embodiment,
(A) is a cross-sectional view, and (B) is a view taken along the line YY of (A). FIG. 5 shows a state where the valve element 5 has moved from the state of FIG.

【００１７】次に図４〜図５を用いて動作を説明する。
図４に示すように弁体５が第２円筒３内にあり、第３円
筒４側から流体圧が加わる場合、流体はＯリング６によ
り阻止されるので流体は第１円筒２へ流れない。また弁
体５は第１円筒２に当たるので移動しない。図４の状態
で第１円筒２側より流体圧が加わると、弁体５は第１バ
ネ１１に抗して第３円筒４側に移動し、図５に示すよう
に弁体５の第２通路９が第３円筒４内に入ると、第１円
筒２、第１通路８、空間７、第２通路９を通り、流体が
第３円筒４へ流れる。弁体５はストッパ１０に当たり停
止する。この状態で第１円筒２側からの流体圧が弱まる
と、第１バネ１１が働き弁体５は図４で示すように第２
円筒３内に復帰する。これにより、第１実施形態の第３
図で説明した、流体圧が第３円筒４側からかかった場合
の流体漏れを防止することができる。Next, the operation will be described with reference to FIGS.
As shown in FIG. 4, when the valve element 5 is inside the second cylinder 3 and a fluid pressure is applied from the third cylinder 4 side, the fluid is blocked by the O-ring 6, so that the fluid does not flow to the first cylinder 2. Also, the valve body 5 does not move because it comes into contact with the first cylinder 2. When a fluid pressure is applied from the first cylinder 2 side in the state of FIG. 4, the valve body 5 moves to the third cylinder 4 side against the first spring 11, and as shown in FIG. When the passage 9 enters the third cylinder 4, the fluid flows through the first cylinder 2, the first passage 8, the space 7, and the second passage 9 to the third cylinder 4. The valve element 5 hits the stopper 10 and stops. In this state, when the fluid pressure from the first cylinder 2 side weakens, the first spring 11 operates to move the valve body 5 to the second position as shown in FIG.
It returns into the cylinder 3. As a result, the third embodiment of the first embodiment
It is possible to prevent fluid leakage when the fluid pressure is applied from the third cylinder 4 side described in the drawing.

【００１８】次に第３実施形態を説明する。図６〜図８
は第３実施形態を示す。第３実施形態は図１に示す第１
実施形態に対し、弁体５の空間７内に第１通路８を閉鎖
する球１２と、この球１２を第１通路８に押圧する第２
バネ１３とを設けた点が相違し他は同じである。図６は
第３実施形態の逆止弁の構成を示し、図７、図８は図６
に対し弁体５が移動した状態を示す。Next, a third embodiment will be described. 6 to 8
Shows a third embodiment. The third embodiment corresponds to the first embodiment shown in FIG.
In contrast to the embodiment, a ball 12 that closes the first passage 8 in the space 7 of the valve body 5 and a second ball 12 that presses the ball 12 into the first passage 8
The difference is that a spring 13 is provided, and the others are the same. FIG. 6 shows a configuration of a check valve according to the third embodiment, and FIGS.
5 shows a state in which the valve element 5 has moved.

【００１９】次に図６〜図８を用いて動作を説明する。
図６に示すように弁体５が第２円筒３内にあり、第３円
筒４側から流体圧が加わる場合、流体はＯリング６によ
り阻止されるので流体は第１円筒２へ流れない。また弁
体５は第１円筒２に当たるので移動しない。図６の状態
で第１円筒２側より流体圧が加わると、弁体５は第３円
筒４側に移動し、図７に示すように弁体５の第２通路９
が第３円筒４内に入ると、第２通路９からの背圧が少な
くなり、球１２が第２バネ１３に抗して第１通路８から
離れ、第１円筒２、第１通路８、空間７、第２通路９を
通り、流体が第３円筒４へ流れる。弁体５はストッパ１
０に当たり停止する。弁体５がこの位置で第１円筒２側
からの流体圧が弱まると、第２バネ１３が働き球１２が
第１通路８に押し付けられ流路を閉鎖する。この状態で
流体圧が図８に示すように第３円筒４側からかかって
も、第３円筒４、第２通路９、空間７、第１通路８を通
り第１円筒２に流れる流路は球１２で閉鎖されているの
で、流体の漏れはない。流体圧により弁体５は移動し第
２円筒３内に入り、第１円筒２に当たり停止する。な
お、スラリー等の流動体を使用する場合、従来の逆止弁
と同様に、球１２と接する第１通路８に粒子等が付着す
るが、シールはＯリング６で行うため、この面に粒子等
が付着しても、図８の状態で流体が多少漏る程度であ
る。このため従来の逆止弁の弁座の清掃を行う頻度より
もかなり少ない頻度で清掃を行えばよい。Next, the operation will be described with reference to FIGS.
As shown in FIG. 6, when the valve element 5 is inside the second cylinder 3 and a fluid pressure is applied from the third cylinder 4 side, the fluid is blocked by the O-ring 6, so that the fluid does not flow to the first cylinder 2. Also, the valve body 5 does not move because it comes into contact with the first cylinder 2. When the fluid pressure is applied from the first cylinder 2 side in the state of FIG. 6, the valve element 5 moves to the third cylinder 4 side, and as shown in FIG.
Enters the third cylinder 4, the back pressure from the second passage 9 decreases, the ball 12 separates from the first passage 8 against the second spring 13, and the first cylinder 2, the first passage 8, The fluid flows to the third cylinder 4 through the space 7 and the second passage 9. The valve element 5 is the stopper 1
Stops at zero. When the fluid pressure from the first cylinder 2 side is weakened at this position of the valve body 5, the second spring 13 works and the ball 12 is pressed against the first passage 8 to close the flow passage. In this state, even if the fluid pressure is applied from the third cylinder 4 side as shown in FIG. 8, the flow path flowing to the first cylinder 2 through the third cylinder 4, the second passage 9, the space 7, and the first passage 8 is Since it is closed by the ball 12, there is no leakage of fluid. The valve element 5 moves by the fluid pressure, enters the second cylinder 3 and hits the first cylinder 2 and stops. When a fluid such as a slurry is used, particles adhere to the first passage 8 in contact with the sphere 12 as in the case of the conventional check valve. Even if they adhere, the fluid is slightly leaked in the state of FIG. For this reason, the cleaning may be performed much less frequently than the frequency of cleaning the valve seat of the conventional check valve.

【００２０】以上の説明では弁体５の一方から流体圧が
働くとしたが、これは弁体５の両側の差圧の一方が高い
と同じ意味である。これにより本実施形態の逆止弁は負
圧に対しても動作する。In the above description, the fluid pressure acts from one side of the valve body 5, but this has the same meaning as one of the differential pressures on both sides of the valve body 5 is high. As a result, the check valve of the present embodiment operates even with a negative pressure.

【００２１】[0021]

【発明の効果】以上の説明から明らかなように、本発明
は、弁本体に円筒状３段付空間を設け、さらにこの第２
円筒内に嵌合する弁体を設け、弁体の外周に設けたシー
ルで第２円筒との間をシールし、弁体内に第１円筒に導
通する第１通路と側面に導通する第２通路を有する空間
を設けることにより、スラリー等の流動体に対しても清
掃頻度の少ない逆止弁とすることができる。また、弁体
と第３円筒間に復帰用第１バネを設けたり、弁体の空間
内に第１通路を閉鎖するよう第２バネで付勢された球を
設けることにより、弁体が第２円筒内に復帰するときの
僅かな流体漏れを防止することができる。As is apparent from the above description, according to the present invention, a three-stage cylindrical space is provided in the valve body,
A valve body fitted in the cylinder is provided, and a seal provided on the outer periphery of the valve body seals the space between the second cylinder and the first passage in the valve body and the second passage in the valve body. By providing the space having the above, it is possible to provide a check valve with a low cleaning frequency even for a fluid such as a slurry. Also, by providing a first spring for return between the valve body and the third cylinder, or providing a ball urged by a second spring to close the first passage in the space of the valve body, Slight fluid leakage when returning to the inside of the two cylinders can be prevented.

【図面の簡単な説明】[Brief description of the drawings]

【図１】第１実施形態の構成を示し、（Ａ）は断面図、
（Ｂ）は（Ａ）のＸ−Ｘ矢視図である。1A and 1B show a configuration of a first embodiment, in which FIG.
(B) is an XX view of (A).

【図２】図１の動作を示す図である。FIG. 2 is a diagram showing the operation of FIG.

【図３】図１の別の動作を示す図である。FIG. 3 is a diagram showing another operation of FIG. 1;

【図４】第２実施形態の構成を示し、（Ａ）は断面図、
（Ｂ）は（Ａ）のＹ−Ｙ矢視図である。4A and 4B show a configuration of a second embodiment, in which FIG.
(B) is a view on arrow YY of (A).

【図５】図４の動作を示す図である。FIG. 5 is a diagram showing the operation of FIG. 4;

【図６】第３実施形態の構成を示すである。FIG. 6 shows a configuration of a third embodiment.

【図７】図６の動作を示す図である。FIG. 7 is a diagram showing the operation of FIG. 6;

【図８】図６の別の動作を示す図である。FIG. 8 is a diagram showing another operation of FIG. 6;

【図９】従来の逆止弁を使用した往復動ポンプを示す図
である。FIG. 9 is a diagram showing a conventional reciprocating pump using a check valve.

【符号の説明】 １ 本体 ２ 第１円筒 ３ 第２円筒 ４ 第３円筒 ５ 弁体 ６ Ｏリング（シール） ６ａ Ｏリング溝 ７ 空間 ８ 第１通路 ９ 第２通路 １０ ストッパ １１ 第１バネ １２ 球 １３ 第２バネ[Description of Signs] 1 Main body 2 First cylinder 3 Second cylinder 4 Third cylinder 5 Valve 6 O-ring (seal) 6a O-ring groove 7 Space 8 First passage 9 Second passage 10 Stopper 11 First spring 12 Sphere 13 Second spring

Claims (4)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 内部が第１円筒と第２円筒と第３円筒の
３段付円筒空間を有し、各円筒の直径は、第１円筒直径
ｄ１＜第２円筒直径ｄ２＜第３円筒直径ｄ３である本体
と、前記第２円筒と嵌合する円筒体であって、第３円筒
側の外周に円周状のシールを有し、内部に空間を有しこ
の空間より第１円筒に通ずる第１通路と前記シールより
第１円筒側の側面に通ずる第２通路とを有する弁体と、
を備えたことを特徴とする逆止弁。1. The interior has a three-stage cylindrical space of a first cylinder, a second cylinder, and a third cylinder, and the diameter of each cylinder is as follows: first cylinder diameter d1 <second cylinder diameter d2 <third cylinder diameter a main body of d3 and a cylindrical body fitted with the second cylinder, having a circumferential seal on the outer periphery of the third cylinder side, having a space inside, and communicating with the first cylinder from this space; A valve body having a first passage and a second passage communicating with a side surface of the seal closer to the first cylinder;
A check valve comprising: 【請求項２】 前記弁体と第３円筒との間には弁体を第
１円筒側に復帰させる第１バネが設けられていることを
特徴とする請求項１記載の逆止弁。2. The check valve according to claim 1, wherein a first spring for returning the valve body to the first cylinder side is provided between the valve body and the third cylinder. 【請求項３】 前記弁体の空間には前記第１通路を閉塞
する球と、この球を第１通路に押し付ける第２バネとが
設けられていることを特徴とする請求項１記載の逆止
弁。3. The reverse of claim 1, wherein a sphere for closing the first passage and a second spring for pressing the sphere against the first passage are provided in the space of the valve body. Stop valve. 【請求項４】 前記弁体が第３円筒側に移動したとき弁
体が第２円筒から外れないように移動を阻止するスット
パが前記第３円筒に設けられていることを特徴とする請
求項１ないし３のいずれかに記載の逆止弁。4. A stopper is provided on the third cylinder to prevent the valve body from moving away from the second cylinder when the valve body moves to the third cylinder side. The check valve according to any one of 1 to 3, above.
JP36750798A 1998-12-24 1998-12-24 Check valve Expired - Fee Related JP3005215B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP36750798A JP3005215B1 (en) 1998-12-24 1998-12-24 Check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP36750798A JP3005215B1 (en) 1998-12-24 1998-12-24 Check valve

Publications (2)

Publication Number Publication Date
JP3005215B1 true JP3005215B1 (en) 2000-01-31
JP2000193109A JP2000193109A (en) 2000-07-14

Family

ID=18489489

Family Applications (1)

Application Number Title Priority Date Filing Date
JP36750798A Expired - Fee Related JP3005215B1 (en) 1998-12-24 1998-12-24 Check valve

Country Status (1)

Country Link
JP (1) JP3005215B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107869603A (en) * 2017-12-21 2018-04-03 厦门大学嘉庚学院 Low pressure check valve and its method of work

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6063224B2 (en) * 2012-09-26 2017-01-18 株式会社ニフコ Check valve

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107869603A (en) * 2017-12-21 2018-04-03 厦门大学嘉庚学院 Low pressure check valve and its method of work
CN107869603B (en) * 2017-12-21 2023-08-04 厦门大学嘉庚学院 Low-pressure one-way valve and working method thereof

Also Published As

Publication number Publication date
JP2000193109A (en) 2000-07-14

Similar Documents

Publication Publication Date Title
US5902096A (en) Diaphragm pump having multiple rigid layers with inlet and outlet check valves
US6105610A (en) Cartridge valve with triple sequential seal
JPS61500130A (en) sliding valve
JP2003166655A (en) Poppet type valve seal mechanism
EP2280184A3 (en) Segmented reservoir for viscous clutches
KR960011227A (en) Right Angle Thermal Response Expansion Valves
US6481982B1 (en) Diaphragm pump having a mechanism for preventing the breakage of the diaphragm when a discharge check valve is not completely closed due to the insertion of foreign matter into the valve
CN100547179C (en) Flap valve
EP3027942B1 (en) Check valve having polymeric seat and poppet
JP3005215B1 (en) Check valve
US3874629A (en) Fluid operated needle valve
JPH08505100A (en) Liquid pressure reducing valve
US6280162B1 (en) Radial piston pump
JPH05502644A (en) anti-lock control brake system
JPH05240157A (en) Pump
JP3712465B2 (en) Air control type vacuum valve and its control method
JP2583414B2 (en) Shock absorber
EP1360995A4 (en) Valve unit and container
CN116045047B (en) Safety valve and rocket storage tank
JPH043189Y2 (en)
KR200493045Y1 (en) Valve module with status check
JP2556686Y2 (en) dispenser
JPH07174251A (en) Constant flow rate valve
JPS6275180A (en) Metallic diaphragm valve
JPH0112043Y2 (en)

Legal Events

Date Code Title Description
R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20081119

Year of fee payment: 9

S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 9

Free format text: PAYMENT UNTIL: 20081119

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 10

Free format text: PAYMENT UNTIL: 20091119

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 10

Free format text: PAYMENT UNTIL: 20091119

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 11

Free format text: PAYMENT UNTIL: 20101119

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20111119

Year of fee payment: 12

LAPS Cancellation because of no payment of annual fees