JP2802417B2 - Check valve - Google Patents

Check valve

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Publication number
JP2802417B2
JP2802417B2 JP15485494A JP15485494A JP2802417B2 JP 2802417 B2 JP2802417 B2 JP 2802417B2 JP 15485494 A JP15485494 A JP 15485494A JP 15485494 A JP15485494 A JP 15485494A JP 2802417 B2 JP2802417 B2 JP 2802417B2
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JP
Japan
Prior art keywords
valve
chamber
pressure
valve body
pressure receiving
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
JP15485494A
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Japanese (ja)
Other versions
JPH0821546A (en
Inventor
貞雄 岡田
勝俊 中村
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Rinnai Corp
Original Assignee
Rinnai Corp
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Priority to JP15485494A priority Critical patent/JP2802417B2/en
Publication of JPH0821546A publication Critical patent/JPH0821546A/en
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Publication of JP2802417B2 publication Critical patent/JP2802417B2/en
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Expired - Fee Related legal-status Critical Current

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Description

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

【０００１】[0001]

【産業上の利用分野】本発明は、逆止弁、特にリフト弁
式の逆止弁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, and more particularly to a check valve of the lift valve type.

【０００２】[0002]

【従来技術及び課題】従来のリフト弁式の逆止弁は、図
１のような構成であり、流路中に設けた弁室(10)の構成
壁の一つに弁口(12)を形成すると共に他の構成壁に流出
口(13)を形成し、この弁室(10)に収容した弁体(2) をバ
ネ(21)による付勢力によって前記弁口(12)に続く弁座(1
1)に下流側から対接させている。2. Description of the Related Art A conventional lift valve type check valve has a structure as shown in FIG. 1, in which a valve port (12) is provided on one of constituent walls of a valve chamber (10) provided in a flow passage. The valve body (2) accommodated in the valve chamber (10) is formed by forming an outlet (13) in the other constituent wall, and the valve body (2) accommodated in the valve chamber (10) is biased by a spring (21) to a valve seat following the valve port (12). (1
1) is contacted from the downstream side.

【０００３】通常、前記バネ(21)は、弁体(2) の弁軸(2
2)に余裕をもって外嵌される態様で前記弁体(2) と弁室
(10)の構成壁との間に介装され、このバネ(21)の付勢力
によって、弁体(2) が閉弁されている。なお、前記弁体
(2) の開弁圧力は、上記バネ(21) の付勢力と、弁体(2)
の受圧面積と、この弁体(2) に作用する流体圧力との
関係によって決定される。Normally, the spring (21) is connected to the valve shaft (2) of the valve body (2).
The valve body (2) and the valve chamber are fitted so as to fit outside with a margin to 2).
The valve (2) is closed by the urging force of the spring (21). The valve body
The valve opening pressure of (2) depends on the urging force of the spring (21) and the valve body (2).
And the fluid pressure acting on the valve body (2).

【０００４】このものでは、流路に流れがないときに
は、弁体(2) が前記弁座(11)に対接して弁口(12)を閉塞
した状態にあり、流路に上流側から下流側への正流が生
じて弁体(2) に作用する一次側と二次側の差圧が設定値
になるとこの弁体(2) が自動的に開弁されて、弁口(12)
から流出口(13)への流路が連通する。つまり、逆止弁は
開弁状態となる。In this case, when there is no flow in the flow path, the valve body (2) is in contact with the valve seat (11) and the valve port (12) is closed, so that the flow path is downstream from the upstream side. When the differential pressure between the primary side and the secondary side acting on the valve body (2) reaches the set value due to the occurrence of a positive flow to the valve side, the valve body (2) is automatically opened and the valve port (12)
The flow path from the to the outlet (13) communicates. That is, the check valve is opened.

【０００５】逆に、弁口(12)の上流側に負圧力が作用し
たりして、上流側の圧力が下流側の圧力よりも低く（逆
差圧状態）なると、弁体(2) が自動的に閉弁される（以
下、逆止状態という）。従って、下流側から上流側への
逆流現象が防止できる。上記従来の形式の逆止弁では、
簡単な構成によって前記逆止作用を有するものの、逆止
弁の作動圧力、つまり、閉弁状態の弁体(2) が開弁する
に要する流体圧力が比較的高いものとなり、この作動圧
力を低く設定した場合には、逆止状態に於けるシール性
が不十分となる、と言う問題がある。Conversely, when a negative pressure acts on the upstream side of the valve port (12) and the pressure on the upstream side becomes lower than the pressure on the downstream side (reverse differential pressure state), the valve element (2) is automatically turned on. The valve is closed (hereinafter referred to as a check state). Therefore, the backflow phenomenon from the downstream side to the upstream side can be prevented. In the above conventional check valve,
Although having the above-described check action by a simple structure, the operating pressure of the check valve, that is, the fluid pressure required to open the valve body (2) in the closed state becomes relatively high, and this operating pressure is reduced. When set, there is a problem that the sealing performance in the non-return state becomes insufficient.

【０００６】これは、次の理由による。弁体(2) の上記
作動圧力を下げるには、バネ(21)の付勢力を弱くする
か、または、弁口(12)の直径を大きく設定して、閉弁時
に於ける単位シール面積当りの弁体加圧力を低くするこ
とが考えられるが、この場合、逆流条件によってはシー
ル部のシール圧力が不足する事態も生じることとなるか
らである。This is for the following reason. In order to reduce the above operating pressure of the valve body (2), weaken the urging force of the spring (21) or set the diameter of the valve port (12) to be large, and per unit seal area when the valve is closed. It is conceivable that the pressure applied to the valve body is reduced, but in this case, depending on the backflow condition, the sealing pressure of the sealing portion may be insufficient.

【０００７】本発明は、かかる点に鑑みてなされたもの
であり、『弁口(12)を閉塞する弁体(2) をバネ(21)によ
って閉弁方向に付勢するようにした逆止弁』において、
逆止弁を開弁する為の作動圧力が低く、逆止状態におけ
る十分なシール性を確保できるようにすることをその課
題とする。The present invention has been made in view of the above point, and has been made in consideration of the above-mentioned problem. "A non-return valve for urging a valve body (2) for closing a valve port (12) in a valve closing direction by a spring (21)". Valve)
It is an object of the present invention to provide a low operating pressure for opening a check valve and to ensure a sufficient sealing property in a check state.

【０００８】[0008]

【技術的手段】上記課題を解決するための本発明の技術
的手段は、『弁口(12)の下流側に続けて連通形成した空
室(3) を、ダイヤフラム(4) によって、前記弁口(12)に
連通し且流出口(13)を具備する第１空室(3a)と、これの
反対側の第２空室(3b)とに区画し、弁体(2) によって前
記弁口(12)をその上流側から閉塞し、この弁体(2) の弁
軸(22)を前記弁口(12)を貫通させて前記ダイヤフラム
(4) の受圧応動部に連結させ、弁体(2) の閉弁付勢力を
付与する為のバネ(21)を設け、前記弁軸(22)には弁口(1
2)の上流側と第２空室(3b)とを連通させる連通孔(24)を
貫通形成し、ダイヤフラム(4) の受圧面積を弁体(2) の
受圧面積よりも大きく設定した』ことである。Technical Means The technical means of the present invention for solving the above-mentioned problem is as follows: "A vacant chamber (3) continuously formed downstream of a valve port (12) is formed by a diaphragm (4). A first chamber (3a) communicating with the port (12) and having an outflow port (13), and a second chamber (3b) opposite to the first chamber (3a); The port (12) is closed from the upstream side, and the valve shaft (22) of the valve body (2) is made to pass through the valve port (12) so that the diaphragm
A spring (21) for applying a valve closing urging force of the valve body (2) is provided, and a valve port (1) is provided on the valve shaft (22).
A communication hole (24) for communicating the upstream side of (2) with the second chamber (3b) is formed so as to penetrate therethrough, and the pressure receiving area of the diaphragm (4) is set to be larger than the pressure receiving area of the valve body (2) ”. It is.

【０００９】[0009]

【作用】上記技術的手段は次のように作用する。逆止弁
が閉弁状態にある時には、バネ(21)の付勢力によって閉
弁されている。流路に上流側から下流側への正流が生じ
ると、弁体(2) が弁口(12)を上流側から閉塞しているこ
とから、一次側（弁体(2) の上流側）と二次側（弁体
(2) の下流側）の差圧がこの弁体(2) の受圧部全体に作
用する力と、バネ(21)による閉弁付勢力との和が、閉弁
力として作用しているが、一方、連通孔(24)を介して第
２空室(3b)と一次側とが連通していることから、ダイヤ
フラム(4) における第２空室(3b)側の受圧部には、前記
一次側と二次側との差圧が作用しこれの総和（前記差圧
とダイヤフラムの受圧面積との積）が弁体(2) の開弁力
として作用する。ダイヤフラム(4) の受圧面積は弁体
(2)の受圧面積よりも十分に大きく設定されているか
ら、前記開弁力が上記閉弁力よりも十分に大きくなり、
弁体(2) が開弁され、一次側から弁口(12)を介して第１
空室(3a)から流出口(13)に流路が連通して正流状態とな
る。The above technical means operates as follows. When the check valve is in the closed state, it is closed by the urging force of the spring (21). When a positive flow from the upstream side to the downstream side occurs in the flow path, the primary side (upstream side of the valve body (2)) because the valve body (2) closes the valve port (12) from the upstream side. And the secondary side (valve element
(The downstream side of (2)), the sum of the force acting on the entire pressure receiving portion of the valve body (2) and the biasing force of the spring (21) acts as the valve closing force. On the other hand, since the second chamber (3b) communicates with the primary side through the communication hole (24), the pressure receiving portion of the diaphragm (4) on the second chamber (3b) side has The differential pressure between the primary side and the secondary side acts, and the total sum (the product of the differential pressure and the pressure receiving area of the diaphragm) acts as the valve opening force of the valve body (2). The pressure receiving area of the diaphragm (4) is the valve
Since the pressure receiving area of (2) is set sufficiently large, the valve opening force is sufficiently larger than the valve closing force,
The valve body (2) is opened, and the first side is opened from the primary side through the valve port (12).
The flow path communicates from the vacant room (3a) to the outflow port (13) to be in a normal flow state.

【００１０】逆に、一次側が負圧状態になったり、逆差
圧状態になると、第１空室(3a)側の圧力が第２空室(3b)
側の圧力よりも高くなるから、「ダイヤフラム(4) の第
１空室(3a)側の受圧部に作用する前記差圧の総和とバネ
(21)の閉弁付勢力」から、「弁口(12)を介して弁体(2)
の受圧部に作用する前記差圧の総和に一致する開弁付勢
力」を差し引いた値が閉弁力として作用し、これによ
り、弁体(2) が閉弁して逆流が阻止される。Conversely, when the primary side is in a negative pressure state or a reverse differential pressure state, the pressure in the first vacant chamber (3a) is increased to the second vacant chamber (3b).
The pressure is higher than the pressure on the first side of the diaphragm (4).
(21) from `` valve closing bias force '' to `` valve element (2) through valve port (12)
The value obtained by subtracting the "valve opening urging force corresponding to the sum of the differential pressures acting on the pressure receiving portion" acts as a valve closing force, whereby the valve body (2) is closed and the backflow is prevented.

【００１１】以上のように、ダイヤフラム(4) の前記受
圧部の面積と弁体(2) の受圧部の面積との差が大きな上
記構成の場合、従来のものに比べて上記開弁力が大幅に
大きくなる。従って、バネ(21)による閉弁付勢力が大き
な場合であっても一次側圧力が低い条件で開弁するもの
となる。As described above, in the case of the above configuration in which the difference between the area of the pressure receiving portion of the diaphragm (4) and the area of the pressure receiving portion of the valve body (2) is large, the valve opening force is smaller than that of the conventional one. Will be significantly larger. Therefore, even when the valve closing biasing force of the spring (21) is large, the valve is opened under the condition that the primary pressure is low.

【００１２】逆に、逆止状態での閉弁付勢力は、一次側
と二次側の差圧が作用するダイヤフラム(4) と弁体(2)
の受圧面積の差による閉弁付勢力とバネ(21)による閉弁
付勢力の総和となるから、バネ(21)による閉弁付勢力が
弱い場合でも、逆止状態に於けるシール圧力が十分であ
る。Conversely, the valve closing urging force in the non-return state is caused by the diaphragm (4) and the valve body (2) on which the differential pressure between the primary side and the secondary side acts.
The sum of the valve closing biasing force due to the difference in the pressure receiving area of the valve and the valve closing biasing force of the spring (21) ensures that even when the valve closing biasing force of the spring (21) is weak, the sealing pressure in the check state is sufficient. It is.

【００１３】[0013]

【効果】以上のように、弁体(2) の開弁力、及び、逆止
状態に於ける弁体(2) の閉弁付勢力は、前記弁体(2)ノ受
圧面積よりも十分に大きなダイヤフラム (4)の受圧面積
によって決まるから、一次側の流体圧力が低い場合でも
開弁力が十分に大きくなると共に、逆止状態に於けるシ
ール性能が確実なものとなる。[Effect] As described above, the valve-opening force of the valve body (2) and the valve-closing urging force of the valve body (2) in the non-return state are sufficiently larger than the pressure receiving area of the valve body (2). Is determined by the pressure receiving area of the diaphragm (4), the valve opening force is sufficiently increased even when the fluid pressure on the primary side is low, and the sealing performance in the non-return state is ensured.

【００１４】[0014]

【実施例】次に、上記した本発明の実施例を図面に従っ
て詳述する。図２〜図３に示す実施例では、入口側接続
部(14)と出口側接続部(15)を弁箱本体(1) の側壁にて同
方向に開口させると共に、前記入口側接続部(14)に続く
一次側流路(1a)の下流端に弁口(12)を開口させ、前記出
口側接続部(15)の上流側に続く二次側流路(1b)の上流端
には下方に開放する空所が形成されて、この開放端部に
ネジ止めされる底蓋(16)とによって空室(3) が構成さ
れ、この空室(3) は、前記空所と底蓋(16)との境界部に
張設されたダイヤフラム(4) によって第１空室(3a)と第
２空室(3b)とに区画される。そして、前記弁箱本体(1)
の前記空所の開放端と底蓋(16)とのネジ止め部はこれら
の間に介在されるダイヤフラム(4) の周縁部によってそ
の水密が確保されている。Next, an embodiment of the present invention will be described in detail with reference to the drawings. In the embodiment shown in FIGS. 2 and 3, the inlet-side connecting portion (14) and the outlet-side connecting portion (15) are opened in the same direction on the side wall of the valve body (1), and the inlet-side connecting portion (14) is opened. A valve port (12) is opened at the downstream end of the primary side flow path (1a) following the 14), and at the upstream end of the secondary side flow path (1b) following the upstream side of the outlet side connection part (15). A cavity that opens downward is formed, and a bottom cover (16) screwed to the open end forms a cavity (3) .The cavity (3) is composed of the cavity and the bottom cover. The first chamber (3a) and the second chamber (3b) are partitioned by a diaphragm (4) stretched at the boundary with (16). And the valve body (1)
The watertightness of the screwed portion between the open end of the space and the bottom lid (16) is ensured by the peripheral edge of the diaphragm (4) interposed therebetween.

【００１５】上記弁口(12)は、一次側流路(1a)と第１空
室(3a)との境界壁(17)に貫通形成され、前記境界壁(17)
の一次側流路(1a)側の上面の前記弁口(12)の外周部が、
弁体(2) の環状リブ(2a)が対接する弁座(11)となってい
る。この弁体(2) の弁軸(22)が前記弁口(12)を貫通し第
１空室(3a)側に突出し、その下端が前記ダイヤフラム
(4) の中央部に連結されている。The valve port (12) is formed through a boundary wall (17) between the primary side flow path (1a) and the first chamber (3a).
The outer peripheral portion of the valve port (12) on the upper surface of the primary flow path (1a) side,
The annular rib (2a) of the valve body (2) forms a valve seat (11) to be in contact with. The valve shaft (22) of the valve body (2) penetrates through the valve port (12) and protrudes toward the first vacant chamber (3a).
It is connected to the center of (4).

【００１６】ダイヤフラム(4) は、弁箱本体(1) と底蓋
(16)によってその周縁部が挟圧保持される円盤状の可撓
性シート(41)とその上面の中央の一定範囲に添設される
第１受圧板(42)と、前記可撓性シート(41)の下面に添設
される同様の第２受圧板(43)とからなり、これら三者の
中央が弁軸(22)の下端部に連結されている。従って、こ
のダイヤフラム(4) は前記第１受圧板(42)と第２受圧板
(43)とによって挟圧された部分が水平姿勢を保ったまま
で、第１空室(3a)と第２空室(3b)との間の差圧力に応じ
て応動する。この実施例では、前記第１受圧板(42)と第
２受圧板(43)とによる可撓性シート挟圧部が既述の受圧
応動部となる。The diaphragm (4) is composed of a valve body (1) and a bottom cover.
(16) a disc-shaped flexible sheet (41) whose peripheral edge portion is pinched and held, a first pressure receiving plate (42) provided in a certain range in the center of the upper surface thereof, and the flexible sheet A second pressure receiving plate (43) is attached to the lower surface of (41), and the center of these three members is connected to the lower end of the valve shaft (22). Therefore, the diaphragm (4) is composed of the first pressure receiving plate (42) and the second pressure receiving plate (42).
While the portion sandwiched by (43) keeps the horizontal posture, it responds according to the pressure difference between the first chamber (3a) and the second chamber (3b). In this embodiment, the pressure receiving portion of the flexible sheet formed by the first pressure receiving plate (42) and the second pressure receiving plate (43) serves as the pressure receiving response portion described above.

【００１７】そして、この弁軸(22)には連通孔(24)がこ
れの軸線方向に貫通し、この弁軸(22)に余裕をもって外
嵌させたバネ(21)が上記境界壁(17)と第１受圧板(42)と
の間に介装される。このバネ(21)は圧縮バネとしてあ
り、その上端は、境界壁(17)から突出させた弁口(12)と
同心のガイド筒(18)に外嵌している。この実施例では、
正流時には、連通孔(24)を介して作用する一次側圧力に
よって、ダイヤフラム(4) には上向きの付勢力が作用
し、この付勢力に基づく開弁力(F1)により弁体(2) が前
記バネ(21)の付勢力に抗して開弁される。また、逆止状
態では、バネ(21)による閉弁付勢力と、第１空室(3a)か
らダイヤフラム(4) に作用する一次側と二次側との差圧
による閉弁付勢力との和が、閉弁力(F2)として作用す
る。A communication hole (24) penetrates through the valve shaft (22) in the axial direction of the valve shaft (22), and a spring (21) externally fitted to the valve shaft (22) with a margin is provided with a spring (21). ) And the first pressure receiving plate (42). The spring (21) is a compression spring, and its upper end is fitted on a guide cylinder (18) concentric with the valve port (12) projecting from the boundary wall (17). In this example,
During forward flow, the primary pressure acting through the communication hole (24), the diaphragm (4) acts biasing force upward, the valve body (2 by valve opening force based on the biasing force (F 1) ) Is opened against the urging force of the spring (21). In the non-return state, the valve closing urging force of the spring (21) and the valve closing urging force of the differential pressure between the primary side and the secondary side acting on the diaphragm (4) from the first chamber (3a) are reduced. The sum acts as the valve closing force (F 2 ).

【００１８】上記開弁力(F1)及び逆止状態の閉弁力(F2)
を、ダイヤフラム(4) の受圧面積(S 1)、弁体(2) の受圧
面積(S2)、バネ(21)の付勢力(W) 、さらには、一次側流
路(1a)の圧力(P1)、二次側流路(1b)の圧力(P2)との関係
から求めると次のとおりである。 Ｆ1 ＝（Ｓ1 Ｐ1 ＋Ｓ2 Ｐ2 ）−（Ｓ1 Ｐ2 ＋Ｓ2 Ｐ1 ＋Ｗ） ＝Ｓ1 （Ｐ1 −Ｐ2 ）−Ｓ2 （Ｐ1 −Ｐ2 ）−Ｗ ＝（Ｓ1 −Ｓ2 ）（Ｐ1 −Ｐ2 ）−Ｗ 従って、正流時には、Ｐ1 ＞Ｐ2 であることから、この
差圧を(P0)とすると、 Ｐ0 （Ｓ1 −Ｓ2 ）＞Ｗ となるように、前記受圧面積(S1)及び受圧面積(S2)の大
きさを設定しておけば良い。この実施例では、前記受圧
面積(S1)＝３．１４ｃｍ2 と受圧面積(S2)＝０．５ｃｍ
2 との面積差が２．６４ｃｍ2 に設定してあり、バネ(2
1)の付勢力(W)を０．０７ｋｇ程度に設定している。従
って、この場合には、Ｐ0 ＝０．０２７ｋｇｆ／ｃｍ2
の条件で開弁することとなる。The valve opening force (F1) And valve closing force (FTwo)
With the pressure receiving area of the diaphragm (4) (S 1), Pressure receiving of valve body (2)
Area (STwo), The biasing force (W) of the spring (21), and the primary side flow
(1a) pressure (P1), Pressure (PTwoRelationship with
Is as follows. F1 = (S1 P1 + STwo PTwo )-(S1 PTwo + STwo P1 + W) = S1 (P1 −PTwo ) -STwo (P1 −PTwo ) -W = (S1 -STwo ) (P1 −PTwo ) -W Therefore, at the time of normal flow, P1 > PTwo Therefore, this
Differential pressure (P0), P0 (S1 -STwo )> W so that the pressure receiving area (S1) And pressure receiving area (STwo) Large
Just set the size. In this embodiment, the pressure receiving
Area (S1) = 3.14 cmTwo And pressure receiving area (STwo) = 0.5cm
Two 2.64cmTwo And set the spring (2
The biasing force (W) of 1) is set to about 0.07 kg. Obedience
Therefore, in this case, P0 = 0.027kgf / cmTwo 
The valve will be opened under the following conditions.

【００１９】なお、逆流時に作用する閉弁付勢力(F2)は
次の式で与えられる。 Ｆ2 ＝Ｓ1 （Ｐ2 −Ｐ1 ）−Ｓ2 （Ｐ2 −Ｐ1 ）＋Ｗ ＝（Ｓ1 −Ｓ2 ）（Ｐ2 −Ｐ1 ）＋Ｗ 逆流時にはＰ1 ＜Ｐ2 であるから、又、Ｓ1 ＞Ｓ2 であ
ることから、この閉弁付勢力(F2)は十分な大きさとな
る。The valve closing urging force (F 2 ) acting at the time of backflow is given by the following equation. F 2 = S 1 (P 2 −P 1 ) −S 2 (P 2 −P 1 ) + W = (S 1 −S 2 ) (P 2 −P 1 ) + W Since P 1 <P 2 at the time of reverse flow, Further, since S 1 > S 2 , the valve closing urging force (F 2 ) is sufficiently large.

【００２０】因に、受圧面積(S1)と受圧面積(S2)の面積
差及び付勢力(W) を上記値に設定すると、差圧（Ｐ2 −
Ｐ1 ）＝０．０３ｋｇｆ／ｃｍ2 の弱い逆流状態のとき
前記閉弁付勢力(F2)の値は０．１５ｋｇｆとなる。な
お、上記実施例のものでは、弁座(11)を図２に示すよう
に平面部とし、弁体(2) の前記弁座(11)との対接部に環
状リブ(2a)を具備する構成としてあるが、図１に示す従
来例のように弁座(11)を環状の凸条によって構成し、弁
体(2) の前記弁座との対接部を平面としても良い。If the difference between the pressure receiving area (S 1 ) and the pressure receiving area (S 2 ) and the urging force (W) are set to the above values, the differential pressure (P 2 −
(P 1 ) = 0.03 kgf / cm 2 In a weak backflow state, the value of the valve closing urging force (F 2 ) is 0.15 kgf. In the above embodiment, the valve seat (11) is a flat portion as shown in FIG. 2, and the valve body (2) is provided with an annular rib (2a) at a portion where the valve body (2) is in contact with the valve seat (11). However, as in the conventional example shown in FIG. 1, the valve seat (11) may be formed of an annular ridge, and the portion of the valve body (2) in contact with the valve seat may be flat.

【００２１】また、上記実施例では、一次側流路(1a)及
び二次側流路(1b)は平行に且同方向に設定されている
が、図３に示すように、一次側流路(1a)と二次側流路(1
b)を逆の方向に設定してもよく、これ以外の他の流路の
方向に設定することも可能である。In the above embodiment, the primary side flow path (1a) and the secondary side flow path (1b) are set in parallel and in the same direction. However, as shown in FIG. (1a) and the secondary flow path (1
b) may be set in the opposite direction, or may be set in other directions of the flow path.

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

【図１】従来例の説明図FIG. 1 is an explanatory view of a conventional example.

【図２】本発明実施例の説明図FIG. 2 is an explanatory view of an embodiment of the present invention.

【図３】その変形例の説明図FIG. 3 is an explanatory view of a modified example thereof.

【符号の説明】[Explanation of symbols]

(12)・・・弁口 (2) ・・・弁体 (21)・・・バネ (3) ・・・空室 (13)・・・流出口 (3a)・・・第１空室 (3b)・・・第２空室 (22)・・・弁軸 (24)・・・連通孔 (12) ・ ・ ・ Valve (2) ・ ・ ・ Valve (21) ・ ・ ・ Spring (3) ・ ・ ・ Vacancy (13) ・ ・ ・ Outlet (3a) ・ ・ ・ First vacancy ( 3b) ・ ・ ・ Second vacant room (22) ・ ・ ・ Valve shaft (24) ・ ・ ・ Communication hole

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 弁口(12)を閉塞するための弁体(2) をバ
ネ(21)によって閉弁方向に付勢するようにした逆止弁に
おいて、弁口(12)の下流側に続けて連通形成した空室
(3) を、ダイヤフラム(4) によって、前記弁口(12)に連
通し且流出口(13)を具備する第１空室(3a)と、これの反
対側の第２空室(3b)とに区画し、弁体(2) によって前記
弁口(12)をその上流側から閉塞し、この弁体(2) の弁軸
(22)を前記弁口(12)を貫通させて前記ダイヤフラム(4)
の受圧応動部に連結させ、弁体(2) の閉弁付勢力を付与
する為のバネ(21)を設け、前記弁軸(22)には弁口(12)の
上流側と第２空室(3b)とを連通させる連通孔(24)を貫通
形成し、ダイヤフラム(4)の受圧面積を弁体(2) の受圧
面積よりも大きく設定した逆止弁。A check valve in which a valve element (2) for closing a valve port (12) is urged in a valve closing direction by a spring (21) is provided on a downstream side of the valve port (12). Vacancies formed continuously
(3) is connected to the valve port (12) by a diaphragm (4) and a first chamber (3a) having an outlet (13) and a second chamber (3b) on the opposite side to the first chamber (3a). The valve port (12) is closed from the upstream side by the valve element (2), and the valve shaft of the valve element (2) is closed.
(22) through the valve port (12) and the diaphragm (4)
A spring (21) for applying a valve closing biasing force of the valve body (2) is provided, and the valve shaft (22) is connected to the upstream side of the valve port (12) and the second air gap. A check valve in which a communication hole (24) communicating with the chamber (3b) is formed so as to penetrate therethrough, and a pressure receiving area of the diaphragm (4) is set larger than a pressure receiving area of the valve body (2).
JP15485494A 1994-07-06 1994-07-06 Check valve Expired - Fee Related JP2802417B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15485494A JP2802417B2 (en) 1994-07-06 1994-07-06 Check valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15485494A JP2802417B2 (en) 1994-07-06 1994-07-06 Check valve

Publications (2)

Publication Number Publication Date
JPH0821546A JPH0821546A (en) 1996-01-23
JP2802417B2 true JP2802417B2 (en) 1998-09-24

Family

ID=15593364

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15485494A Expired - Fee Related JP2802417B2 (en) 1994-07-06 1994-07-06 Check valve

Country Status (1)

Country Link
JP (1) JP2802417B2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011210676A (en) * 2010-03-30 2011-10-20 Aisin Seiki Co Ltd Fuel cell system

Also Published As

Publication number Publication date
JPH0821546A (en) 1996-01-23

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