JPS63111379A - Ball valve - Google Patents

Ball valve

Info

Publication number
JPS63111379A
JPS63111379A JP25419486A JP25419486A JPS63111379A JP S63111379 A JPS63111379 A JP S63111379A JP 25419486 A JP25419486 A JP 25419486A JP 25419486 A JP25419486 A JP 25419486A JP S63111379 A JPS63111379 A JP S63111379A
Authority
JP
Japan
Prior art keywords
seal
pressure side
valve
small diameter
valve seat
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
Application number
JP25419486A
Other languages
Japanese (ja)
Inventor
Morio Ikematsu
池松 盛生
Kenichi Maruyama
丸山 憲一
Nobuo Ishigami
石上 伸夫
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NIPPON BOORUBARUBU KK
Nippon Ball Valve Co Ltd
Original Assignee
NIPPON BOORUBARUBU KK
Nippon Ball Valve Co Ltd
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 NIPPON BOORUBARUBU KK, Nippon Ball Valve Co Ltd filed Critical NIPPON BOORUBARUBU KK
Priority to JP25419486A priority Critical patent/JPS63111379A/en
Publication of JPS63111379A publication Critical patent/JPS63111379A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE:To surely seal the low pressure side of a ball valve, by forming a small diameter part having an outer diameter smaller than that of a seal part for a valve element, in the outer surface of a valve seat on the low pressure side. CONSTITUTION:An annular seal holding member 14 is fitted on a small diameter part 13 which is outside of a stepped part 12 formed in the substantially middle section of each of valve seats 7, 7'. The diameter of the small diameter part 13 is slightly smaller than the diameter A of a seal part of each valve seat 7, 7' for the valve element. Further, the seal holding member 14 is mounted in its inner peripheral surface with an O-ring 15 made into close contact with the inner peripheral surface of the small diameter part 13, and in its outer peripheral surface, with an O-ring 16 made in contact with a valve body 3. With this arrangement, even though leakage occurs on the high pressure side or high pressure is charged in a pocket part during valve closing, it is possible to surely seal the low pressure side without increasing the urging force of a Belleville spring.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 この発明はボールバルブに関し、特にそのシール構造に
関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a ball valve, and particularly to its seal structure.

〔従来の技術〕[Conventional technology]

従来のボールバルブは、第1図に示すように、ボンネッ
ト1に装着したボール弁体2を弁本体3の上面に形成し
た穴4から挿入し、弁本体3に形成された対向一対の流
入口5及び流出口6に筒状の弁座7.7′を0リング8
を介して挿入し、その先端を弁体2に当接するとともに
、その各弁座7.7′の後端に皿バネ9を押当て、その
皿バネ9を流入口5及び流出口6にネジ嵌合した押えリ
ング10により支持するようにしている。また上記のボ
ンネット1はシール部材を介して弁本体3に取付けられ
る。
As shown in FIG. 1, in a conventional ball valve, a ball valve body 2 attached to a bonnet 1 is inserted through a hole 4 formed in the upper surface of a valve body 3, and a pair of opposing inflow ports formed in the valve body 3 are inserted. 5 and the outflow port 6 with a cylindrical valve seat 7.7' and an 0 ring 8.
The distal end of the disc spring 9 is pressed against the rear end of each valve seat 7, 7', and the disc spring 9 is screwed into the inlet 5 and outlet 6. It is supported by a fitted presser ring 10. Further, the above-mentioned bonnet 1 is attached to the valve body 3 via a seal member.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

上記のボールバルブにおける弁体2と弁座7.7′間の
シールは、皿バネSの押圧力によって保証されるが、い
ま高圧側のシール面にシール不良が発生したとすると、
ボンネット1下面の空所、即ちポケット11内の圧力が
上昇し、ついには皿バネ9の押圧力に打勝って低圧側の
弁座7′を後退せしめ、これにより流体がリークする。
The seal between the valve body 2 and the valve seat 7.7' in the above ball valve is guaranteed by the pressing force of the disc spring S, but if a sealing failure occurs on the sealing surface on the high pressure side,
The pressure inside the pocket 11, which is a void on the lower surface of the bonnet 1, increases and eventually overcomes the pressing force of the disc spring 9, causing the low pressure side valve seat 7' to retreat, thereby causing fluid to leak.

即ち、第2図に示すように、弁座7′のシール部の直径
をA、弁座7′の外径をB、皿バネSの押圧力をPs、
ポケット11内の流体の圧力をP。
That is, as shown in FIG. 2, the diameter of the seal portion of the valve seat 7' is A, the outer diameter of the valve seat 7' is B, and the pressing force of the disc spring S is Ps.
The pressure of the fluid in the pocket 11 is P.

とすると、 ps >−(B” −A’ )XPO の関係にある場合は、低圧側の弁座7′は皿バネ9の押
圧力によって弁体2に押圧されるが、流体圧力P0が増
大すると、上記の不等号が逆になり弁座7′を後退せし
めるため、流体がリークすることになる。
Then, if the relationship is ps > - (B" - A') Then, the above inequality sign is reversed and the valve seat 7' is moved backward, resulting in fluid leakage.

そこで、この発明は、何らかの原因でポケット内の圧力
が上昇したとしても、低圧側弁座においてリークを生じ
させない構造のボールバルブを提供することを目的とす
る。
SUMMARY OF THE INVENTION An object of the present invention is to provide a ball valve having a structure that prevents leakage from occurring at the low-pressure side valve seat even if the pressure in the pocket increases for some reason.

〔問題点を解決するための手段〕[Means for solving problems]

上述の問題を解決するために、この発明は少なくとも低
圧側の弁座外面に弁体に対するシール部の径より小さい
外径の小径部を形成し、上記小径部にシール保持部材を
嵌合するとともに、そのシール保持部材と弁座小径部と
の間及び同部材と弁本体との間にそれぞれシール部材を
介在した構成としたものである。
In order to solve the above-mentioned problem, the present invention forms a small diameter part on at least the outer surface of the valve seat on the low pressure side, the outer diameter of which is smaller than the diameter of the sealing part for the valve body, and fits a seal holding member into the small diameter part. , a seal member is interposed between the seal holding member and the small diameter portion of the valve seat, and between the member and the valve body.

〔作用〕[Effect]

高圧側弁座においてシール不良が発生したり、閉弁時に
高圧が封じ込められ等の原因により、ポケット内の圧力
が上昇した場合、低圧側弁座7′の弁体2に対する押圧
力P、は(1)式のようになる。
If the pressure inside the pocket increases due to a seal failure on the high-pressure side valve seat or high pressure is trapped when the valve is closed, the pressing force P of the low-pressure side valve seat 7' against the valve body 2 will be ( 1) It becomes like the formula.

P、=   (A” −B” )Pa +p、 ・−・
−(11但し、Aはシール部の直径、Bは弁座7′の外
径である。この発明においては、A>Bのように構成さ
れるから、流体の圧力P0が大になっても常にPI >
Oであり、弁体2に対する押圧力が確保される。
P, = (A"-B")Pa +p, ・-・
-(11 However, A is the diameter of the seal portion, and B is the outer diameter of the valve seat 7'. In this invention, since A>B is configured, even if the fluid pressure P0 becomes large, Always PI >
0, and the pressing force against the valve body 2 is ensured.

(実施例〕 第3図及び第4図に示したこの発明の第1実施例のボー
ルバルブは、基本的には従来公知のボールバルブと同様
の構造である。したがって、前記の従来例と同一部分に
ついては同一符号を付して示すにとどめその説明を省略
する。
(Embodiment) The ball valve according to the first embodiment of the present invention shown in FIGS. 3 and 4 basically has the same structure as the conventionally known ball valve. The parts are shown with the same reference numerals and the explanation thereof will be omitted.

この発明の特徴は、弁座7.7′のシール構造にある。The feature of this invention lies in the sealing structure of the valve seat 7, 7'.

即ち、従来は単に円筒状に形成されていた弁座7.7′
の中程に段部12を形成しく第4図参照)、その段部1
2より外方を小径部13とし、その小径部13に環状の
シール保持部材14を嵌合したところにある。
That is, the valve seat 7.7', which was conventionally formed simply in a cylindrical shape.
A step 12 is formed in the middle of the step (see Fig. 4), and the step 1 is
The outer side of 2 is a small diameter part 13, and an annular seal holding member 14 is fitted into the small diameter part 13.

上記小径部13の直径Bは、弁座7.7′の弁体2に対
するシール部の直径Aより幾分小径になるように形成さ
れている。また、シール保持部材14は、その内周面に
小径部13と密着するQ IJソング5を装着し、また
その外周面に弁本体3と密着する0リング16を装着し
ている。
The diameter B of the small diameter portion 13 is formed to be somewhat smaller than the diameter A of the sealing portion of the valve seat 7.7' against the valve body 2. Further, the seal holding member 14 has a Q IJ song 5 attached to its inner peripheral surface that comes into close contact with the small diameter portion 13, and an O-ring 16 that comes into close contact with the valve body 3 on its outer peripheral surface.

上記の実施前香持部材14は、押えリング10と共に流
入口5及び流出口6の端部に形成されたネジ部にネジ嵌
合される。また、皿バネ9は従来どおり、押えリング1
0と各弁座7.7′の後端部間に介在される。
The pre-implementation holding member 14 is threaded into threaded portions formed at the ends of the inflow port 5 and the outflow port 6 together with the presser ring 10 . In addition, the coned disc spring 9 is the same as before, and the presser ring 1
0 and the rear end of each valve seat 7.7'.

上記構成のボールバルブにおいて、高圧側のシール不良
等が原因でポケット11の内部圧力が上昇すると、低圧
側においては、0リング15.16によるシール作用が
働く結果、弁座7′の弁体2に対する押圧力P+につい
ては、A>Bの関係があるため前掲の(1)式が成立し
、低圧側においてシールが確保される。
In the ball valve configured as described above, when the internal pressure of the pocket 11 increases due to a seal failure on the high pressure side, the sealing action by the O-ring 15, 16 works on the low pressure side, and as a result, the valve body 2 of the valve seat 7' With respect to the pressing force P+, since there is a relationship of A>B, the above-mentioned equation (1) is established, and a seal is ensured on the low pressure side.

なお、上記の実施例においては、高圧側及び低圧例の両
方の弁座7.7′に対し同一のシール構造を採用してい
るが、この発明においては、少なくとも低圧側において
上記の構造を採用すればよく、高圧側のシール構造には
こだわらない0例えば高圧側は従来例と同様の弁座であ
っても差支えない。
In the above embodiment, the same sealing structure is adopted for both the valve seats 7 and 7' on the high pressure side and the low pressure example, but in this invention, the above structure is adopted at least on the low pressure side. There is no need to worry about the seal structure on the high pressure side.For example, the high pressure side may have the same valve seat as the conventional example.

また、耐熱性が要求される場合は、第5図に示    
′すように、0リング15.16に代えてグランドパツ
キン17及びガスケット18を使用する場合がある。
In addition, if heat resistance is required, the
As shown in FIG.

次に、第6図に示す第2実施例について説明する。この
実施例のボールバルブは、弁座7.7′の弁体2に対す
るシール部を2個所、すなわち大径シール部19と小径
シール部20を形成したちのである。大径シール部19
の直径をA、小径シール部20の直径をCとすると、 A>B>C の関係があるように形成される。
Next, a second embodiment shown in FIG. 6 will be described. In the ball valve of this embodiment, the valve seat 7, 7' has two seal portions for the valve body 2, namely a large diameter seal portion 19 and a small diameter seal portion 20. Large diameter seal part 19
When the diameter of the small diameter seal portion 20 is A and the diameter of the small diameter seal portion 20 is C, the relationship is A>B>C.

したがって、いま前述の第1実施例の場合と同様に、高
圧側の弁座7にシール不良が発生したとすると、低圧側
においては、前掲のill弐の関係が成立する。この点
で第1実施例の場合と同様である。
Therefore, if a seal failure occurs in the valve seat 7 on the high pressure side, as in the case of the first embodiment described above, on the low pressure side, the above-mentioned relationship 2 will hold. This point is similar to the first embodiment.

しかし、この第2実施例の場合は、通常の状態において
、高圧側弁座7に対し、その小径部13と小径シール部
20の断面積の差に基づく押圧力が加わり、 pg ” −(B”  C” )po ’ +ps・・
・・・・(2)の関係をもつ押圧力P2が弁体2に作用
する。但し、Pa’は高圧側の流体圧である。したがっ
て、高圧側に圧力流体が存在しない場合はバネ力P。
However, in the case of the second embodiment, in the normal state, a pressing force is applied to the high pressure side valve seat 7 based on the difference in cross-sectional area between the small diameter portion 13 and the small diameter seal portion 20, and pg ” - (B "C") po' + ps...
... A pressing force P2 having the relationship (2) acts on the valve body 2. However, Pa' is the fluid pressure on the high pressure side. Therefore, if there is no pressure fluid on the high pressure side, the spring force P.

だけが作用するが、圧力流体が存在すると、それより大
きい押圧力P2が作用し、高圧側のシールが確保される
ことになる。
However, if pressure fluid is present, a larger pressing force P2 will act, ensuring a seal on the high pressure side.

なお、上記の弁座7.7′のシール構造は、高圧側、低
圧側の双方に採用してもよく、そのようにすれば両側同
一構造となる利点があるが、低圧側においては小径シー
ル部20は格別な機能がないので、小径シール部20を
省略し、大径シール部19のみを有するシール構造、即
ち、第1実施例のシール構造を採用してもよい。
Note that the seal structure of the valve seat 7, 7' mentioned above may be adopted on both the high pressure side and the low pressure side, which has the advantage of having the same structure on both sides, but a small diameter seal is used on the low pressure side. Since the portion 20 has no special function, the small diameter seal portion 20 may be omitted and the seal structure having only the large diameter seal portion 19, that is, the seal structure of the first embodiment may be adopted.

次に、第7図に示す第3実施例は、高圧側のその他の例
を示すものである。この場合の低圧側は、第4図及び第
5図に示すいずれでもよい0図示の高圧側の構造は、シ
ール保持部材14を流入口5の穴壁にスライド自在に挿
入し、上記保持部材14と小径部13との間にOリング
15、穴壁との間にOリング16をそれぞれ装着したも
のである。
Next, the third embodiment shown in FIG. 7 shows another example on the high pressure side. In this case, the low-pressure side may be either shown in FIGS. 4 or 5. The structure of the high-pressure side shown in FIG. An O-ring 15 is installed between the hole and the small diameter portion 13, and an O-ring 16 is installed between the hole wall and the hole wall.

この保持部材14は最大外径りを有し、かつその内端に
弁座7の段部12に当接しうる小径部14′を有する。
This holding member 14 has a maximum outer diameter, and has a small diameter portion 14' at its inner end that can come into contact with the stepped portion 12 of the valve seat 7.

この場合D>Aの関係をもたせておくと、シール保持部
材14はシールを保持しつつスライドするから、弁体2
に作用する押圧力P、は、P3−   (D”  A”
 ) P e’ + P s・・・・・・(3)となり
、常にP、〉0の関係が成立し、高圧側のシールが確保
される。
In this case, if the relationship D>A is maintained, the seal holding member 14 will slide while holding the seal, so the valve body 2
The pressing force P acting on is P3- (D” A”
) P e' + P s (3), and the relationship P,>0 is always established, ensuring a seal on the high pressure side.

〔発明の効果〕〔Effect of the invention〕

以上のように、この発明は、ポケット部の圧力が上昇し
た際に、その圧力により低圧側弁座が弁体に押圧される
ので、高圧側にリークが発生したり、閉弁時にポケット
部に高圧を封入することがあっても、皿バネの押圧力を
増加することなく低圧側のシールが確保出来る効果があ
る。皿バネの押圧力の増加がないので、弁体操作時のト
ルクは従来と同じ大きさでよい。
As described above, in this invention, when the pressure in the pocket part increases, the pressure presses the low pressure side valve seat against the valve body, so leakage occurs on the high pressure side, and when the valve closes, the pocket part Even if high pressure is enclosed, the seal on the low pressure side can be ensured without increasing the pressing force of the disc spring. Since there is no increase in the pressing force of the disc spring, the torque required for operating the valve body may be the same as in the conventional case.

また、第2実施例として示したように、高圧側弁座に大
径シール部と小径シール部を形成したタイプのものζI
、或いは第3実施例のようなシール保持部材を使用した
ものは、上記の効果に加えて、皿バネの押圧力を増加す
ることなく高圧側のシール効果も増大させることができ
る。
In addition, as shown in the second embodiment, a type ζI in which a large diameter seal portion and a small diameter seal portion are formed on the high pressure side valve seat.
Alternatively, in addition to the above-mentioned effects, the seal holding member of the third embodiment can also increase the sealing effect on the high pressure side without increasing the pressing force of the disc spring.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は従来例の断面図、第2図は同上の一部拡大断面
図、第3図は第1実施例の断面図、第4図は同上の一部
拡大断面図、第5図は同上の変形例の一部拡大断面図、
第6図は第2実施例の一部拡大断面図、第7図は第3実
施例の一部拡大断面図である。 1・・・・・・ボンネット、2・・・・・・弁体、3・
・・・・・弁本体、4・・・・・・穴、5・・・・・・
流入口、6・・・・・・流出口、7.7′・・・・・・
弁座、9・・・・・・皿バネ、10・・・・・・押えリ
ング、11・・・・・・ポケット、12・・・・・・段
部、13・・・・・・小径部、14・・・・・・シール
保持部材、19・・・・・・大径シール、20・・・・
・・小径シール部。 特許出願人   日本ポールバルブ株式会社同 代理人
   鎌   1)  文   二第1図 第2図 第3図 第4図 第6FA 第5図
Fig. 1 is a sectional view of the conventional example, Fig. 2 is a partially enlarged sectional view of the same, Fig. 3 is a sectional view of the first embodiment, Fig. 4 is a partially enlarged sectional view of the same. A partially enlarged cross-sectional view of the above modification,
FIG. 6 is a partially enlarged sectional view of the second embodiment, and FIG. 7 is a partially enlarged sectional view of the third embodiment. 1...Bonnet, 2...Valve body, 3.
... Valve body, 4 ... Hole, 5 ...
Inlet, 6...Outlet, 7.7'...
Valve seat, 9...disc spring, 10...pressing ring, 11...pocket, 12...step, 13...small diameter Part, 14... Seal holding member, 19... Large diameter seal, 20...
...Small diameter seal part. Patent applicant: Japan Pall Valve Co., Ltd. Agent: Kama 1) Text 2 Figure 1 Figure 2 Figure 3 Figure 4 Figure 6 FA Figure 5

Claims (1)

【特許請求の範囲】[Claims] 弁本体に形成した高圧側流入口と低圧側流出口にそれぞ
れ皿バネによって付勢された弁座をボール弁体に押圧し
てなるボールバルブにおいて、少なくとも低圧側の弁座
外面に弁体に対するシール部の径より小さい外径の小径
部を形成し、上記小径部にシール保持部材を嵌合すると
ともに、そのシール保持部材と弁座小径部との間及び同
部材と弁本体との間にそれぞれシール部材を介在したこ
とを特徴とするボールバルブ。
In a ball valve in which a valve seat is pressed against a ball valve body by a disc spring at a high-pressure side inlet and a low-pressure side outlet formed in the valve body, a seal against the valve body is provided at least on the outer surface of the valve seat on the low-pressure side. A small diameter portion having an outer diameter smaller than the diameter of the valve seat is formed, and a seal holding member is fitted into the small diameter portion, and a seal holding member is formed between the seal holding member and the valve seat small diameter portion, and between the same member and the valve body. A ball valve characterized by having a sealing member interposed therebetween.
JP25419486A 1986-10-25 1986-10-25 Ball valve Pending JPS63111379A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP25419486A JPS63111379A (en) 1986-10-25 1986-10-25 Ball valve

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP25419486A JPS63111379A (en) 1986-10-25 1986-10-25 Ball valve

Related Child Applications (1)

Application Number Title Priority Date Filing Date
JP2673987A Division JPS63111380A (en) 1987-02-06 1987-02-06 Ball valve

Publications (1)

Publication Number Publication Date
JPS63111379A true JPS63111379A (en) 1988-05-16

Family

ID=17261551

Family Applications (1)

Application Number Title Priority Date Filing Date
JP25419486A Pending JPS63111379A (en) 1986-10-25 1986-10-25 Ball valve

Country Status (1)

Country Link
JP (1) JPS63111379A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0212570U (en) * 1988-07-08 1990-01-25
JPH07190212A (en) * 1993-12-27 1995-07-28 Kitamura Valve Seizo Kk Trunnion type rotary valve suitable for powder/grain control
JP2010276078A (en) * 2009-05-27 2010-12-09 Hisaka Works Ltd Valve device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5740940A (en) * 1980-08-25 1982-03-06 Fujitsu Ltd Semiconductor device
JPS61184278A (en) * 1985-02-07 1986-08-16 カメロン・アイアン・ワ−クス・インコ−ポレ−テツド Bidirectional seal

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5740940A (en) * 1980-08-25 1982-03-06 Fujitsu Ltd Semiconductor device
JPS61184278A (en) * 1985-02-07 1986-08-16 カメロン・アイアン・ワ−クス・インコ−ポレ−テツド Bidirectional seal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0212570U (en) * 1988-07-08 1990-01-25
JPH07190212A (en) * 1993-12-27 1995-07-28 Kitamura Valve Seizo Kk Trunnion type rotary valve suitable for powder/grain control
JP2010276078A (en) * 2009-05-27 2010-12-09 Hisaka Works Ltd Valve device

Similar Documents

Publication Publication Date Title
US4964423A (en) Check valve
JPS6256671A (en) Valve
JP3861206B2 (en) Fluid controller
US4083376A (en) Two piece double acting valve seat assembly
US4856555A (en) Check valve
US6719271B2 (en) Combination face and plug seal
JPS63111379A (en) Ball valve
US4344632A (en) Fluid pressure sealing ring for a valve
JPH11344135A (en) Seal structure for ball valve
JPS61252972A (en) Gate valve
JPH034077A (en) Check valve
JP4464489B2 (en) Check valve
JPS63111380A (en) Ball valve
JPH07243536A (en) Floating ring seal
JPS62266276A (en) Ball valve
JPS5937375A (en) Cartridge type check valve
JP2006275124A (en) Gas cock for city gas
GB2071820A (en) Seal assembly
KR100363022B1 (en) A Valve seat of ball valve
SU804980A1 (en) Valve
RU2000018C1 (en) Ball cock
JP3016008B2 (en) Two-sided seat type three-way ball valve
JPS5813176Y2 (en) non-return valve
JPS58200867A (en) Suction valve
US4815702A (en) Gate valve with poppet closure