JP6745123B2 - Cryogenic valve for cryogenic use - Google Patents

Cryogenic valve for cryogenic use Download PDF

Info

Publication number
JP6745123B2
JP6745123B2 JP2016061711A JP2016061711A JP6745123B2 JP 6745123 B2 JP6745123 B2 JP 6745123B2 JP 2016061711 A JP2016061711 A JP 2016061711A JP 2016061711 A JP2016061711 A JP 2016061711A JP 6745123 B2 JP6745123 B2 JP 6745123B2
Authority
JP
Japan
Prior art keywords
valve
valve rod
rod
cryogenic
valve body
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.)
Active
Application number
JP2016061711A
Other languages
Japanese (ja)
Other versions
JP2017172754A (en
Inventor
學 磯江
學 磯江
Original Assignee
共栄バルブ工業株式会社
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 共栄バルブ工業株式会社 filed Critical 共栄バルブ工業株式会社
Priority to JP2016061711A priority Critical patent/JP6745123B2/en
Publication of JP2017172754A publication Critical patent/JP2017172754A/en
Application granted granted Critical
Publication of JP6745123B2 publication Critical patent/JP6745123B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Mechanically-Actuated Valves (AREA)
  • Lift Valve (AREA)

Description

この発明は、液体窒素などの極低温液体や極低温ガスの輸送管路に設ける極低温用玉形弁、詳しくは、温度低下に起因した弁体収縮の影響を受けないようにして閉弁の信頼性低下を防止した極低温用玉形弁に関する。 The present invention relates to a cryogenic spherical valve provided in a transport line for cryogenic liquid such as liquid nitrogen or cryogenic gas, and more particularly, to a valve closing valve that is not affected by contraction of a valve body caused by a temperature decrease. A globular valve for cryogenic use, which prevents a decrease in reliability.

首記の極低温用玉形弁は、液体窒素などの極低温の液体や極低温のガスを運搬するタンクローリなどに利用されている。 The cryogenic globular valve described above is used for tank trucks that carry cryogenic liquids such as liquid nitrogen and cryogenic gas.

その玉形弁の従来技術として、例えば、下記特許文献１，２などに示されるものがある。 As a conventional technology of the ball valve, for example, there are those disclosed in Patent Documents 1 and 2 below.

特許文献１に記載された玉形弁（止め弁）は極低温用であって、同文献の図６に示された玉形弁は、弁体を極低温領域において強靭性と弾性を有する繊維補強ポリ・エーテル・エーテル・ケトン樹脂で形成しており、その弁体を弁箱に形成された弁座に押付けて弁部を閉じるものになっている。 The globular valve (stop valve) described in Patent Document 1 is for cryogenic temperature, and the globular valve shown in FIG. 6 of the document is a fiber having toughness and elasticity in a valve body in a cryogenic region. It is made of reinforced poly-ether-ether-ketone resin, and its valve body is pressed against the valve seat formed in the valve box to close the valve portion.

前記弁体は、弁棒の下端に取付けられており、前記弁棒をねじの推力を利用して推進させることでこの弁体を弁座に押付けるようにしている。 The valve body is attached to the lower end of the valve rod, and the valve body is pressed against the valve seat by propelling the valve rod using thrust of a screw.

なお、弁棒の推進は、弁箱の上部に弁棒を保護する耐圧さや管を取付け、さらに、その耐圧さや管の上部にヨーク部を取付け、そのヨーク部に設けた軸受部に弁棒外周の雄ねじを螺合させ、弁棒に取付けたハンドル車（特許文献１は回転ハンドルと称している）を操作することで弁棒を回転させて前記軸受部と弁棒の螺合部に推力を生じさせる方法でなされている。 For the propulsion of the valve rod, a pressure-resistant tube or pipe is attached to the upper part of the valve box to protect the valve rod, and a yoke is attached to the upper part of the pressure-resistant tube or pipe. Screwing the male screw and operating a handle wheel (referred to as a rotating handle in Patent Document 1) attached to the valve rod to rotate the valve rod and apply thrust to the threaded portion of the bearing portion and the valve rod. It is done in a way that causes it.

特許文献２の玉形弁も、弁棒の下端に取付けた弁体を弁棒を推進させることで弁箱（弁ケース）の弁座に押付けて弁部を閉じるものになっている。 The ball valve of Patent Document 2 also closes the valve portion by pushing the valve element attached to the lower end of the valve rod against the valve seat of the valve box (valve case) by propelling the valve rod.

この特許文献２の玉形弁は、ハンドル車を操作して回転させる駆動スリーブを有しており、その駆動スリーブに弁棒の上部外周の雄ねじが螺合している。 The ball valve of Patent Document 2 has a drive sleeve for operating and rotating a handle wheel, and a male screw on the upper outer periphery of a valve rod is screwed into the drive sleeve.

弁棒は、弁箱の内部に回り止め輪を設けてその回り止め輪に相対回転不可、かつ、軸方向スライド可能に係合させており、これにより、前記ハンドル車で前記駆動スリーブを回転させたときに弁棒が回転せずに推進して弁体が弁座に押付けられる。 The valve rod is provided with a detent ring inside the valve box, and is engaged with the detent ring so as not to rotate relative to the valve stem and slidable in the axial direction, thereby rotating the drive sleeve in the handle wheel. When pushed, the valve rod does not rotate and is propelled to press the valve element against the valve seat.

この特許文献２の玉形弁は、弁部の開閉が弁棒の回転を伴わずになされるので、弁棒の外周をシールするパッキンの摺動抵抗増が回避される。 In the globular valve of Patent Document 2, since the valve portion is opened and closed without the rotation of the valve rod, an increase in sliding resistance of the packing that seals the outer periphery of the valve rod is avoided.

これにより、特許文献１の玉形弁に比べてハンドル車の回転トルクが低減され、前記パッキンの寿命も向上するなどの利点が得られるが、弁体を弁棒で直接動かして弁座に押付ける閉弁構造は特許文献１の玉形弁と変わるところがない。 As a result, the rotating torque of the handle wheel is reduced and the life of the packing is improved compared to the spherical valve of Patent Document 1, but the valve body is directly moved by the valve stem and pushed to the valve seat. The valve closing structure to be attached is no different from the globular valve of Patent Document 1.

特開２００８−１９８８３号公報JP, 2008-19883, A 特開平７−２６９７２１号公報JP, 7-269721, A

極低温の液体の輸送管路に設ける玉形弁は、使用時の温度低下により弁体が収縮して弁座に対するシール圧の低下が起こる。 In the spherical valve provided in the transport line for cryogenic liquid, the valve body contracts due to the temperature decrease during use, and the sealing pressure against the valve seat decreases.

極低温用玉形弁の弁体の弁座に対する当接部は、低温特性と耐薬品性に優れた３フッ化樹脂（ＰＣＴＦＥ:ポリクロロトリフルオロエチレン ダイキン工業株式会社製 商品名：ネオフロンなど）で形成されたもの（以下ではソフトパッキンと言う）が一般的に利用されている。 The contact part of the valve body of the cryogenic spherical valve with the valve seat is a trifluoride resin with excellent low temperature characteristics and chemical resistance (PCTFE: Polychlorotrifluoroethylene Daikin Industries, Ltd. product name: NEOFLON, etc.) The one formed by (hereinafter referred to as soft packing) is generally used.

その３フッ化樹脂で形成されたソフトパッキンは、極低温の環境下におかれると収縮して厚みが減少する。収縮前厚みが６ｍｍ程度のソフトパッキンの場合、−１９０℃の温度差での厚み減少量は、０．１ｍｍ程度である。 The soft packing formed of the trifluororesin shrinks and is reduced in thickness when placed in an extremely low temperature environment. In the case of a soft packing having a thickness before shrinkage of about 6 mm, the thickness reduction amount at a temperature difference of -190°C is about 0.1 mm.

液体窒素の温度は−１９６℃であるので、その液体窒素の輸送管路に設ける玉形弁の場合、管路内が常温から液体窒素温度になったときに−１９０℃程度の温度差が発生する。 Since the temperature of liquid nitrogen is -196°C, in the case of a spherical valve installed in the liquid nitrogen transport pipe, a temperature difference of about -190°C occurs when the temperature in the pipe changes from normal temperature to liquid nitrogen. To do.

そのため、前記ソフトパッキンの温度低下に起因した収縮による厚み減少が避けられない。また、低温特性に優れるフッ化炭素樹脂と言えども、−１９６℃の環境に晒されると硬化による弾力低下が起こる。 Therefore, the reduction of the thickness due to the contraction due to the temperature decrease of the soft packing cannot be avoided. Further, even with a fluorocarbon resin having excellent low-temperature characteristics, when it is exposed to an environment of -196°C, its elasticity decreases due to curing.

このために、液体窒素を運搬するタンクローリ用玉形弁などについては、ソフトパッキンによるシール圧の緩みが生じる。 For this reason, with respect to the tank valve for a tank truck that carries liquid nitrogen, the sealing pressure is loosened by the soft packing.

そのシール圧の緩みは、収縮する前の前記仕様のソフトパッキンが全閉位置で弁座に押付けられた時にシール面に加わる荷重が今３３００Ｎであったとして、前記ソフトパッキンの厚みが熱収縮により０．１ｍｍ薄くなったとするとシール面に加わる荷重は２８７０Ｎまで低下する。これは、無視できない数値であり、閉弁の信頼性を低下させる。 The loosening of the sealing pressure means that the load applied to the sealing surface when the soft packing of the above specifications before pressing against the valve seat in the fully closed position is now 3300 N, and the thickness of the soft packing is reduced by heat shrinkage. If the thickness is reduced by 0.1 mm, the load applied to the sealing surface is reduced to 2870N. This is a non-negligible value and reduces the reliability of valve closing.

なお、前記特許文献１の玉形弁は、繊維補強ポリ・エーテル・エーテル・ケトン樹脂で形成された弁体を採用しているが、この弁体も極低温の環境下におかれると収縮や硬化による弾力低下が起こる。従って、ソフトパッキンの材質変更は、上記問題の根本的な解決策とはなり得ない。 Note that the globular valve of Patent Document 1 employs a valve body formed of fiber reinforced poly-ether-ether-ether-ketone resin, but this valve body also contracts when placed in an extremely low temperature environment. Reducing elasticity due to curing. Therefore, changing the material of the soft packing cannot be a fundamental solution to the above problem.

そこで、この発明は、温度低下に起因した弁体収縮の影響を受けないようにして極低温用玉形弁の使用時の閉弁の信頼性低下を防止することを課題としている。 Therefore, it is an object of the present invention to prevent the decrease in the reliability of the valve closing when the cryogenic sphere valve is used by avoiding the influence of the valve body contraction due to the temperature decrease.

上記の課題を解決するため、この発明においては、上部開口が蓋で塞がれた弁箱と、下端側が前記蓋を貫通して前記弁箱に挿入された弁棒と、前記弁箱の内部の弁座に接離させる弁体を具備し、前記弁棒は、外周に備える雄ねじが前記弁箱に連結された部位の雌ねじに螺合し、その弁棒を当該弁棒の外部露出部に取付けたハンドル車で回転させて前記雄ねじと雌ねじの螺合部に生じる推力で推進させ、その弁棒で前記弁体を前記弁座に押付けて弁部を閉じる極低温用玉形弁を以下の通りに構成した。
即ち、前記弁体が前記弁棒の先端外周に弁体の温度低下による軸方向想定最大収縮量よりも大きな軸方向相対移動が許容される状態に装着され、その弁体と前記弁棒との間に、前記弁体を弁座に向けて付勢するシール圧補正ばねが介在されたものにした。 In order to solve the above problems, in the present invention, a valve box having an upper opening closed by a lid, a lower end side which penetrates the lid and is inserted into the valve box, and an inside of the valve box. Of the valve seat, which is brought into contact with and separated from the valve seat, and the valve rod is screwed into a female screw of a portion where an external thread provided on the outer periphery is connected to the valve box, and the valve rod is exposed to an externally exposed portion of the valve rod. A cryogenic spherical valve for rotating a handwheel attached to it and propelling it by the thrust generated in the screwing portion of the male screw and the female screw and pressing the valve body against the valve seat with the valve rod to close the valve portion is as follows. Configured in the street.
That is, the valve body is mounted on the outer periphery of the tip end of the valve rod in a state in which a relative axial movement larger than the axially assumed maximum contraction amount due to the temperature decrease of the valve body is allowed, and the valve body and the valve rod are attached. A seal pressure correction spring for urging the valve element toward the valve seat is interposed therebetween.

かかる極低温用玉形弁に採用する前記シール圧補正ばねは、皿ばねが好ましい。また、そのシール圧補正ばねは、自由状態で介在するよりも予め圧縮して介在されたものが好ましい。 The seal pressure correction spring used in such a cryogenic valve is preferably a disc spring. Further, it is preferable that the seal pressure correction spring is pre-compressed and intervened rather than intervened in a free state.

前記雌ねじを蓋に、前記雄ねじを前記弁棒の蓋貫通部の外周にそれぞれ設けたものや、前記弁棒の先端に球面を形成し、この弁棒と前記シール圧補正ばねとの間に板状のばね押さえを介在して前記弁棒先端の球面をそのばね押さえに点接触させたものも好ましい。 One in which the female screw is provided on the lid and the male screw is provided on the outer circumference of the lid penetrating portion of the valve rod, or a spherical surface is formed at the tip of the valve rod, and a plate is provided between the valve rod and the seal pressure correction spring. It is also preferable that the spherical surface at the tip of the valve rod is in point contact with the spring retainer via a spring retainer.

また、前記弁体は、前記弁棒に対する軸方向相対移動の許容上限位置で弁棒と係合して弁棒外周から外れ止めされるようにしておくのがよい。 Further, it is preferable that the valve body is engaged with the valve rod at an allowable upper limit position of relative movement in the axial direction with respect to the valve rod and is prevented from coming off from the outer periphery of the valve rod.

その外れ止めは、内面に雌ねじを有する有底円筒部を弁体の上部に備えさせてその有底円筒部に、フランジなどの径方向膨出部を先端外周に設けた弁棒の下端側を挿入し、その後、予め弁棒の外周に嵌めておいた内径が前記径方向膨出部の外径よりも小さな筒状弁押さえを有底円筒部の内側に螺合させる構造を採用して行うと好ましい。 The stopper is equipped with a bottomed cylindrical part having an internal thread on the inner surface on the upper part of the valve element, and the bottomed cylindrical part is provided with a bottom end side of a valve rod provided with a radially expanded portion such as a flange on the tip outer circumference. After the insertion, a structure is adopted in which a tubular valve retainer having an inner diameter previously fitted to the outer periphery of the valve rod and having a smaller inner diameter than the outer diameter of the radial bulging portion is screwed into the inner portion of the bottomed cylindrical portion. And preferred.

なお、この発明の極低温用玉形弁は、前記弁棒を、前記弁箱に対して軸方向移動可能かつ相対回転不可に係合させ、その弁棒が外周に備える雄ねじを回転操作用のハンドル車に連結されたスリーブに形成されている雌ねじに螺合させ、その弁棒を前記ハンドル車を回転させて前記雄ねじと雌ねじの螺合部に生じる推力で推進させ、その弁棒で前記弁体を前記弁座に押付けて弁部を閉じる構造の玉形弁に前記シール圧補正ばねを追設したものであってもよい。 The cryogenic ball valve of the present invention engages the valve rod with the valve box so as to be axially movable and non-rotatable, and a male screw provided on the outer periphery of the valve rod is used for rotational operation. The valve rod is screwed into a female screw formed on a sleeve connected to the handle wheel, and the valve rod is rotated by the thrust force generated in the screwing portion of the male screw and the female screw to propel the valve rod. The seal pressure correction spring may be additionally provided in a ball valve having a structure in which a body is pressed against the valve seat to close the valve portion.

この発明の極低温用玉形弁は、従来の玉形弁と同様に弁棒を弁座側に向けて推進させて弁体を弁座に押付ける。このとき前記弁棒は弁体が全閉位置まで動いた後にもさらに押下げる。 The cryogenic ball valve of the present invention pushes the valve body against the valve seat by propelling the valve rod toward the valve seat side as in the conventional ball valve. At this time, the valve rod is further pushed down even after the valve body has moved to the fully closed position.

これにより、シール圧補正ばねが圧縮され（事前に圧縮されているシール圧補正ばねは事前の圧縮位置からさらに圧縮される）、全閉状態では弁体がシール圧補正ばねの力で弁座に押付けられる。 As a result, the seal pressure correction spring is compressed (the pre-compressed seal pressure correction spring is further compressed from the pre-compressed position), and in the fully closed state, the valve body is moved to the valve seat by the force of the seal pressure correction spring. It is pressed.

また、弁体が全閉位置まで動いた後に弁棒がさらに押下げられることから、前記弁体に軸方向動き代が付与される。このため、この後に温度低下によって弁体が収縮したときにはシール圧補正ばねの力によってシール圧の低下が補われ、全閉状態での適正シール圧が保持される。 Further, since the valve rod is further pushed down after the valve body has moved to the fully closed position, the valve body is provided with an axial movement allowance. Therefore, when the valve body subsequently contracts due to the temperature decrease, the decrease of the seal pressure is compensated by the force of the seal pressure correction spring, and the proper seal pressure in the fully closed state is maintained.

なお、皿ばねのシール圧補正ばねは、コイルばねに比べて軸方向設置スペースが少なくて済み、大きなばね荷重も確保し易い。そのシール圧補正ばねが予め圧縮されているものは、少ない圧縮量でより大きなばね荷重を得ることができる。 The seal pressure correction spring of the disc spring requires less installation space in the axial direction than the coil spring, and can easily secure a large spring load. If the seal pressure correction spring is previously compressed, a larger spring load can be obtained with a small amount of compression.

また、弁棒を回転させて推進力を発生させる玉形弁において前記雌ねじを蓋に、前記雄ねじを前記弁棒の蓋貫通部の外周にそれぞれ設けたものは、雄ねじの直径を大きくして弁棒に大きな推力を付与することが可能であり、ハンドル車の回転操作を軽くすることができる。 Further, in a ball valve that rotates a valve rod to generate a propulsive force, in which the female screw is provided on the lid and the male screw is provided on the outer circumference of the lid penetrating portion of the valve rod, the diameter of the male screw is increased to make the valve larger. It is possible to apply a large thrust to the rod, and it is possible to lighten the rotating operation of the steering wheel.

また、弁棒の先端を球面にし、その球面を弁棒とシール圧補正ばねとの間に介在したばね押さえに点接触させたものは、ばね押さえに対する弁棒の接触抵抗が小さく、弁棒の回転トルク増加が小さく抑えられる。 Further, in the case where the tip of the valve rod is spherical and the spherical surface is point-contacted with the spring retainer interposed between the valve rod and the seal pressure correction spring, the contact resistance of the valve rod against the spring retainer is small, and The increase in rotational torque can be suppressed to a small level.

さらに、弁体が前記弁棒に係合して弁棒から外れ止めされるようにしたものは、弁体を弁棒に追従させて開弁位置に動かすことができる。 Further, the valve body in which the valve body is engaged with the valve stem so as to be prevented from coming off the valve stem, the valve body can be moved to the valve opening position by following the valve stem.

弁体は、弁棒を開弁位置に戻したときに弁部を通過する液体の流動圧で開弁位置に動かすこともできるので弁棒に追従させることは必須ではないが、弁棒に追従する構造にすれば安定した開弁が保証される。 The valve body can be moved to the valve open position by the flow pressure of the liquid passing through the valve portion when the valve rod is returned to the valve open position, so it is not essential to follow the valve rod, but it follows the valve rod. A stable valve opening is guaranteed by adopting the structure.

このほか、弁体の弁棒からの外れ止めが前記弁押さえによってなされるものは、弁押さえを弁体の有底円筒部に螺合させるだけの簡単な操作で弁棒に対する弁体の接続を行える。 In addition, in the case where the valve body is prevented from coming off from the valve stem by the valve retainer, the valve body can be connected to the valve stem by a simple operation in which the valve retainer is screwed into the bottomed cylindrical portion of the valve body. You can do it.

この発明の極低温用玉形弁の一例を示す断面図である。It is sectional drawing which shows an example of the cryogenic spherical valve of this invention. 弁体のシール圧補正ばね設置部の詳細を示す拡大断面図である。It is an expanded sectional view which shows the detail of the seal pressure correction spring installation part of a valve body.

以下、添付図面の図１及び図２に基づいて、この発明の極低温用玉形弁の実施の形態を説明する。 An embodiment of a cryogenic spherical valve of the present invention will be described below with reference to FIGS. 1 and 2 of the accompanying drawings.

図１に示した極低温用玉形弁１は、弁箱２と、その弁箱２の上部開口に取付ける蓋３と、その蓋３を弁箱２に固定するユニオンナット４と、前記蓋３の上部に連結した中継管（さや管）５と、その中継管の上端に取付けたパッキン箱６と、そのパッキン箱と前記中継管５の内側に挿入されて下端が弁箱２の内部に挿入された弁棒７を有する。 The cryogenic spherical valve 1 shown in FIG. 1 includes a valve box 2, a lid 3 attached to the upper opening of the valve box 2, a union nut 4 for fixing the lid 3 to the valve box 2, and the lid 3 described above. Relay pipe (sheath pipe) 5 connected to the upper part of the relay pipe, a packing box 6 attached to the upper end of the relay pipe, the packing box and the relay pipe 5 are inserted inside, and the lower end is inserted into the valve box 2. The valve stem 7 is

また、弁箱２の内部に配置された弁体８と、前記パッキン箱６の内部に設置される弁棒７の外周の液密シール部９と、弁棒７の上端外周に相対回転不可に取付けたハンドル車１０を有する。 Further, the valve body 8 arranged inside the valve box 2, the liquid-tight seal portion 9 on the outer circumference of the valve rod 7 installed inside the packing box 6, and the upper end outer circumference of the valve rod 7 are not relatively rotatable. It has a handle wheel 10 attached.

そしてさらに、弁棒７と弁体８との間に本発明を特徴づけるシール圧補正ばね１１を有する。 Further, a seal pressure correction spring 11 characterizing the present invention is provided between the valve rod 7 and the valve body 8.

弁箱２は、水平配置の軸線上に極低温液体の入口２ａと出口２ｂを有し、さらに、その入口２ａと出口２ｂの間に垂直配置の流路２ｃとその流路を取り巻く上向きに膨出した弁座２ｄを有する。 The valve box 2 has an inlet 2a and an outlet 2b for the cryogenic liquid on the axis of the horizontal arrangement, and further has a vertically arranged channel 2c between the inlet 2a and the outlet 2b and an upward expansion surrounding the channel 2c. It has the valve seat 2d which is taken out.

また、前記蓋３とその蓋３との間に挟み込まれるガスケット１２とによって液密に塞がれる開口２ｅを上部に有する。 Further, an opening 2e that is liquid-tightly closed by the lid 3 and the gasket 12 sandwiched between the lid 3 is provided on the upper portion.

蓋３はユニオンナット４を係合させるフランジ３ａを外周に有し、中継管５の接続部を除く位置の内周面に雌ねじ３ｂを有する。 The lid 3 has a flange 3a for engaging the union nut 4 on the outer circumference, and has an internal thread 3b on the inner peripheral surface at a position excluding the connecting portion of the relay pipe 5.

中継管５は、銀鑞材１３を使用してその中継管の両端を差し込んだ蓋３とパッキン箱６に液密に接合されている。 The relay pipe 5 is liquid-tightly joined to the lid 3 and the packing box 6 in which both ends of the relay pipe are inserted using a silver brazing material 13.

弁棒７は、蓋３に挿通される部分の外周に他部の外径よりも大径の雄ねじ７ａを有し、その雄ねじ７ａを蓋３の内周に形成された雌ねじに３ｂに螺合させている。この弁棒７の下端側は雄ねじ７ａの外径よりも小径の丸軸部にしてその丸軸部の下端外周に蓋３の雌ねじ形成部を通過可能な大きさの径方向膨出部（図のそれはフランジ）７ｂを設けている。 The valve rod 7 has a male screw 7a having a larger diameter than the outer diameter of the other portion on the outer periphery of the portion to be inserted into the lid 3, and the male screw 7a is screwed to a female screw formed on the inner periphery of the lid 3 at 3b. I am letting you. The lower end side of the valve rod 7 is a round shaft portion having a diameter smaller than the outer diameter of the male screw 7a, and a radial bulging portion having a size capable of passing the female screw forming portion of the lid 3 on the outer periphery of the lower end of the round shaft portion (Fig. It has a flange) 7b.

弁体８は、弁座２ｄに押し当てるフッ化炭素樹脂製のソフトパッキン８ａがシート押さえ１６とナット１７とで固定して着脱自在に取付けられている。 A soft packing 8a made of fluorocarbon resin that is pressed against the valve seat 2d is fixed to the valve body 8 with a seat retainer 16 and a nut 17 and is detachably attached.

この弁体８は、内面に雌ねじ８ｃを形成した上端開口の有底円筒部８ｂを上部に有する。また、有底円筒部８ｂの下端中央にばね座となす凹部８ｄを有し、さらに、有底円筒部８ｂの下部にその有底円筒部８ｂの内周から外周に抜ける圧抜き孔８ｅを有する。 This valve body 8 has a bottomed cylindrical portion 8b with an upper end opening having an internal thread 8c formed on the inner surface. Further, a recessed portion 8d serving as a spring seat is provided at the center of the lower end of the bottomed cylindrical portion 8b, and further, a pressure relief hole 8e is formed in the lower portion of the bottomed cylindrical portion 8b from the inner circumference to the outer circumference of the bottomed cylindrical portion 8b. ..

有底円筒部８ｂの内側には、弁棒７の下端側が挿入されている。また、有底円筒部８ｂの内側には予め弁棒７の外周に嵌めておいた内径が径方向膨出部７ｂの外径よりも小さな筒状の弁押さえ１８を螺合させており、この弁押さえ１８によって弁体８の弁棒７の外周からの外れが阻止される。１９は、弁押さえ１８の回り止め部材であり、弁押さえ１８に係合している。 The lower end side of the valve rod 7 is inserted inside the bottomed cylindrical portion 8b. Further, a tubular valve retainer 18 having an inner diameter smaller than the outer diameter of the radial bulging portion 7b, which is previously fitted to the outer periphery of the valve rod 7, is screwed into the inside of the bottomed cylindrical portion 8b. The valve retainer 18 prevents the valve body 8 from coming off the outer periphery of the valve rod 7. Reference numeral 19 is a detent member for the valve retainer 18 and is engaged with the valve retainer 18.

なお、前記弁押さえ１８と有底円筒部８ｂの底との間には、弁棒７の軸方向相対移動を許容する隙間Ｇが設けられている。その隙間Ｇは、弁体８の温度低下による軸方向想定最大収縮量よりも大きい。 A gap G that allows relative movement of the valve rod 7 in the axial direction is provided between the valve retainer 18 and the bottom of the bottomed cylindrical portion 8b. The gap G is larger than the axially assumed maximum contraction amount due to the temperature decrease of the valve body 8.

前記液密シール部９は、パッキン箱６のパッキン収納溝６ａに組み込まれて弁棒７の外周とパッキン箱６との間を密封するシールパッキン９ａと、パッキン箱６の上部外周に螺合させるパッキン押さえナット１４による締付力をシールパッキン９ａに加えるパッキン押さえ輪９ｂと、そのパッキン押さえ輪９ｂとの間にシールパッキン９ａを挟むアダプタ９ｃを組み合わせたものが設置されている。 The liquid-tight seal portion 9 is screwed into a seal packing 9a which is incorporated in the packing storage groove 6a of the packing box 6 and seals between the outer circumference of the valve rod 7 and the packing box 6, and the upper circumference of the packing box 6. A combination of a packing holding wheel 9b for applying a tightening force by the packing holding nut 14 to the seal packing 9a and an adapter 9c for sandwiching the seal packing 9a between the packing holding wheel 9b is installed.

前記シール圧補正ばね１１は、皿ばねを複数枚対向させて組み合わせたものが用いられている。そのシール圧補正ばね１１は、弁体８の有底円筒部８ｂの底に設けた凹部８ｄに挿入されている。 As the seal pressure correction spring 11, a combination of a plurality of disc springs facing each other is used. The seal pressure correction spring 11 is inserted into a recess 8d provided in the bottom of the bottomed cylindrical portion 8b of the valve body 8.

２０は、シール圧補正ばね１１と弁棒７との間に介在した板状のばね押さえである。弁棒７の下端には球面７ｃが設けられており、その球面７ｃがばね押さえ２０に点接触して弁棒７による弁体８の弁座２ｄへの押付けがばね押さえ２０とシール圧補正ばね１１を介してなされるようになっている。 Reference numeral 20 denotes a plate-shaped spring retainer interposed between the seal pressure correction spring 11 and the valve rod 7. A spherical surface 7c is provided at the lower end of the valve rod 7, and the spherical surface 7c makes point contact with the spring retainer 20 to press the valve body 8 against the valve seat 2d by the valve rod 7 and the spring retainer 20 and the seal pressure correction spring. It is supposed to be done through 11.

シール圧補正ばね１１は予め圧縮されており、弁体８が開弁位置にあるときには、シール圧補正ばね１１の力によって弁押さえ１８が弁棒７の下端外周の径方向膨出部７ｂに当たる位置まで弁体８が弁棒７に対して押し下げられている。 The seal pressure correction spring 11 is pre-compressed, and when the valve body 8 is in the valve opening position, the force of the seal pressure correction spring 11 causes the valve retainer 18 to contact the radially expanded portion 7b on the outer periphery of the lower end of the valve rod 7. The valve body 8 is pushed down against the valve rod 7.

以上の通りに構成された例示の極低温用玉形弁１は、弁棒７を下向きに推進させて弁体８を弁座２ｄに押し当て、弁部が全閉となった後にさらにハンドル車１０を操作して前記弁棒７を全閉位置から動きが止まるところまで押下げる。これにより、シール圧補正ばね１１がさらに圧縮されて径方向膨出部７ｂが弁押さえ１８から離れ、弁体８にシール圧補正ばね１１の力による軸方向動き代が生じる。 The example cryogenic spherical valve 1 configured as described above further pushes the valve rod 7 downward to press the valve body 8 against the valve seat 2d, and after the valve portion is fully closed, the handle wheel The valve rod 7 is pushed down from the fully closed position by operating 10 until it stops moving. As a result, the seal pressure correction spring 11 is further compressed, the radial bulging portion 7b is separated from the valve retainer 18, and an axial movement allowance is generated in the valve body 8 by the force of the seal pressure correction spring 11.

その動き代は、温度低下による弁体８の軸方向収縮量よりも大きくなる設計にしており、このため、弁体８が温度低下によって軸方向に収縮したらシール圧補正ばね１１が弾性復元し、全閉位置で弁座２ｄと弁体８の接触部に加えられたシール圧が殆ど低下せずに維持される。 The movement allowance is designed to be larger than the axial contraction amount of the valve body 8 due to the temperature decrease. Therefore, when the valve body 8 contracts in the axial direction due to the temperature decrease, the seal pressure correction spring 11 elastically restores, At the fully closed position, the seal pressure applied to the contact portion between the valve seat 2d and the valve body 8 is maintained with almost no decrease.

なお、例示の極低温用玉形弁１は、弁箱２、中継管５、弁棒７、シール圧補正ばね１１、シート押さえ１６、ナット１７、ハンドル車固定用のナットなどがステンレス鋼で形成され、蓋３は青銅鋳物で、弁体８の本体部（ソフトパッキン８ａ以外の箇所）とパッキン箱６とパッキン押さえ輪９ｂはそれぞれ黄銅で、ハンドル車１０は亜鉛合金ダイカストで形成されているが、これ等の材質は、好ましい一例に過ぎない。 In the illustrated cryogenic valve 1, the valve box 2, the relay pipe 5, the valve rod 7, the seal pressure correction spring 11, the seat retainer 16, the nut 17, the nut for fixing the steering wheel and the like are made of stainless steel. The lid 3 is made of bronze, the body of the valve body 8 (a part other than the soft packing 8a), the packing box 6 and the packing retaining ring 9b are brass, and the handle wheel 10 is made of zinc alloy die cast. However, these materials are only preferable examples.

また、例示の極低温用玉形弁１は、弁棒７を蓋３に螺合させており、弁棒外周の雄ねじ７ａの直径を大きくしてハンドル車１０の回転操作を軽くすることができるが、弁棒７をパッキン箱６に螺合させる構造でも、弁棒７の回転によってその弁棒７を推進させることができる。 Further, in the illustrated cryogenic bulb valve 1, the valve rod 7 is screwed into the lid 3, and the diameter of the male screw 7a on the outer periphery of the valve rod can be increased to lighten the rotating operation of the handle wheel 10. However, even in the structure in which the valve rod 7 is screwed into the packing box 6, the valve rod 7 can be propelled by the rotation of the valve rod 7.

さらに、例示の極低温用玉形弁１は、弁棒７を回転させてその弁棒７を推進させるものになっているが、この発明は、特許文献２の図１に開示された玉形弁にも適用することができる。 Further, the illustrated cryogenic ball valve 1 is designed to rotate the valve rod 7 to propel the valve rod 7. However, the present invention relates to the ball valve disclosed in FIG. It can also be applied to valves.

特許文献２の図１の玉形弁は、前記弁棒を、前記弁箱に対して軸方向移動可能かつ相対回転不可に係合させ、その弁棒が外周に備える雄ねじを回転操作用のハンドル車に連結されたスリーブの雌ねじに螺合させている。 In the spherical valve of FIG. 1 of Patent Document 2, the valve rod is engaged with the valve box so as to be axially movable and non-rotatable, and a male screw provided on the outer periphery of the valve rod is a handle for rotating operation. It is screwed into the female thread of the sleeve connected to the car.

そして、その弁棒を前記ハンドル車を回転させて前記雄ねじと雌ねじの螺合部に生じる推力で推進させ、その弁棒で前記弁体を前記弁座に押付けて弁部を閉じる構造となっている。この玉形弁も前記シール圧補正ばね１１を追設すると、この発明の極低温用玉形弁になる。 Then, the valve rod is rotated by the handle wheel to be propelled by the thrust generated in the screwed portion of the male screw and the female screw, and the valve body is pressed against the valve seat by the valve rod to close the valve portion. There is. This sphere valve also becomes the cryogenic sphere valve of the present invention when the seal pressure correction spring 11 is additionally provided.

１ 極低温用玉形弁
２ 弁箱
２ａ 入口
２ｂ 出口
２ｃ 流路
２ｄ 弁座
２ｅ 開口
３ 蓋
３ａ フランジ
３ｂ 雌ねじ
４ ユニオンナット
５ 中継管
６ パッキン箱
６ａ パッキン収納溝
７ 弁棒
７ａ 雄ねじ
７ｂ 径方向膨出部
７ｃ 球面
８ 弁体
８ａ ソフトパッキン
８ｂ 有底円筒部
８ｃ 雌ねじ
８ｄ 凹部
８ｅ 圧抜き孔
９ 液密シール部
９ａ シールパッキン
９ｂ パッキン押さえ輪
９ｃ アダプタ
１０ ハンドル車
１１ シール圧補正ばね
１２ ガスケット
１３ 銀鑞材
１４ パッキン押さえナット
１６ シート押さえ
１７ ナット
１８ 弁押さえ
１９ 回り止め部材
２０ ばね押さえ
Ｇ 弁棒の先端外周の径方向膨出部の軸方向相対移動を許容する隙間




1 Cryogenic valve 2 Valve box 2a Inlet 2b Outlet 2c Flow path 2d Valve seat 2e Opening 3 Lid 3a Flange 3b Female screw 4 Union nut 5 Relay pipe 6 Packing box 6a Packing storage groove 7 Valve rod 7a Male screw 7b Radial expansion Outer portion 7c Spherical surface 8 Valve body 8a Soft packing 8b Bottomed cylindrical portion 8c Female screw 8d Recessed portion 8e Pressure release hole 9 Liquid tight seal portion 9a Seal packing 9b Packing retaining ring 9c Adapter 10 Handle wheel 11 Seal pressure correction spring 12 Gasket 13 Silver braze Material 14 Packing retainer nut 16 Seat retainer 17 Nut 18 Valve retainer 19 Anti-rotation member 20 Spring retainer G Gap allowing relative axial movement of the radial bulging portion on the outer circumference of the tip of the valve rod




Claims (4)

上部開口が蓋（３）に塞がれた弁箱（２）と、下端側が前記蓋（３）を貫通して前記弁箱（２）に挿入された弁棒（７）と、前記弁箱（２）の内部の弁座（２ｄ）に接離させる弁体（８）を具備し、前記弁棒（７）は、外周に備える雄ねじ（７ａ）が前記弁箱（２）側の雌ねじ（３ｂ）に螺合し、その弁棒（７）を当該弁棒の外部露出部に取付けたハンドル車（１０）で回転させて前記雄ねじ（７ａ）と前記雌ねじ（３ｂ）の螺合部に生じる推力で推進させ、前記弁体（８）を前記弁座（２ｄ）にその弁棒（７）で押付けて弁部を閉じる極低温用玉形弁であって、
前記弁体（８）が前記弁棒（７）の先端外周に弁体の温度低下による軸方向想定最大収縮量よりも大きな軸方向相対移動が許容される状態に装着され、その弁体（８）と前記弁棒（７）との間に、前記弁体（８）を前記弁座（２ｄ）に向けて付勢するシール圧補正ばね（１１）が介在され、
前記弁体（８）は、内面に雌ねじ（８ｃ）を形成した上部開口の有底円筒部（８ｂ）を上部に、ばね座となす凹部（８ｄ）を前記有底円筒部（８ｂ）の下端中央に、前記有底円筒部（８ｂ）の内周から外周に抜ける圧抜き孔（８ｅ）を前記有底円筒部（８ｂ）の下部にそれぞれ有し、
前記有底円筒部（８ｂ）の内側に前記弁棒（７）の下端側が挿入され、前記弁棒（７）の外周に嵌めた弁押さえ（１８）が前記有底円筒部（８ｂ）の内側に螺合され、その弁押さえ（１８）の内径は前記弁棒（７）の下端に形成された径方向膨出部（７ｂ）の外径よりも小さく、前記弁押さえ（１８）の下端と前記径方向膨出部（７ｂ）との間に前記弁体（８）と前記弁棒（７）の軸方向相対移動を許容する隙間（Ｇ）が形成され、前記凹部（８ｄ）に前記シール圧補正ばね（１１）が配置された極低温用玉形弁。 A valve box (2) whose upper opening is closed by a lid (3), a valve stem (7) whose lower end penetrates the lid (3) and is inserted into the valve box (2), and the valve box The valve body (8) is arranged to come into contact with and separate from the valve seat (2d) inside (2), and the valve rod (7) has a male screw (7a) provided on the outer periphery of the valve rod (7) on the valve box (2) side. 3b), and the valve rod (7) is rotated by a handle wheel (10) attached to the externally exposed portion of the valve rod to be generated in the screwed portion of the male screw (7a) and the female screw (3b). A cryogenic spherical valve for propelling the valve body (8) against the valve seat (2d) with its valve rod (7) to close the valve portion,
The valve body (8) is mounted on the outer periphery of the tip end of the valve rod (7) in a state in which relative movement in the axial direction larger than the assumed maximum contraction amount in the axial direction due to temperature decrease of the valve body is allowed. ) And the valve rod (7), a seal pressure correction spring (11) for urging the valve body (8) toward the valve seat (2d) is interposed.
In the valve body (8), a bottomed cylindrical portion (8b) having an upper opening having an internal thread (8c) formed on an inner surface is located at an upper portion, and a recessed portion (8d) serving as a spring seat is provided at a lower end of the bottomed cylindrical portion (8b). In the center of the bottomed cylindrical portion (8b), there is a pressure relief hole (8e) that extends from the inner periphery to the outer periphery of the bottomed cylindrical portion (8b).
The lower end side of the valve rod (7) is inserted inside the bottomed cylindrical portion (8b), and the valve retainer (18) fitted on the outer periphery of the valve rod (7) is inside the bottomed cylindrical portion (8b). And the inner diameter of the valve retainer (18) is smaller than the outer diameter of the radial bulging portion (7b) formed at the lower end of the valve rod (7), and is smaller than the lower end of the valve retainer (18). A gap (G) that allows the valve body (8) and the valve rod (7) to move in the axial direction is formed between the radial bulging portion (7b), and the seal is provided in the recess (8d). Cryospherical valve with a pressure compensation spring (11) . 前記シール圧補正ばね（１１）は、複数の皿ばねを対向させて組み合わせたものであり、このシール圧補正ばね（１１）が前記弁体（８）と前記弁棒（７）との間に予め圧縮して介在されている請求項１に記載の極低温用玉形弁。 The seal pressure correction spring (11) is a combination of a plurality of disc springs facing each other, and the seal pressure correction spring (11) is provided between the valve body (8) and the valve stem (7). The cryogenic spherical valve according to claim 1, wherein the spherical valve is pre-compressed and interposed. 前記雌ねじ（３ｂ）が前記蓋（３）に、前記雄ねじ（７ａ）が前記弁棒（７）の蓋貫通部の外周にそれぞれ設けられた請求項１又は２に記載の極低温用玉形弁。 Cryogenic spherical valve according to claim 1 or 2, wherein the female screw (3b) is provided on the lid (3), and the male screw (7a) is provided on the outer periphery of the lid penetrating portion of the valve rod (7). .. 前記弁棒（７）の先端に球面（７ｃ）が形成され、前記弁棒（７）と前記シール圧補正ばね（１１）との間に板状のばね押さえ（２０）が介在され、前記弁棒先端の球面（７ｃ）が前記ばね押さえ（２０）に点接触している請求項１〜３のいずれかに記載の極低温用玉形弁。 A spherical surface (7c) is formed at the tip of the valve rod (7), and a plate-shaped spring retainer (20) is interposed between the valve rod (7) and the seal pressure correction spring (11), and The spherical valve for cryogenic use according to any one of claims 1 to 3, wherein the spherical surface (7c) at the tip of the rod is in point contact with the spring retainer (20).
JP2016061711A 2016-03-25 2016-03-25 Cryogenic valve for cryogenic use Active JP6745123B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2016061711A JP6745123B2 (en) 2016-03-25 2016-03-25 Cryogenic valve for cryogenic use

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2016061711A JP6745123B2 (en) 2016-03-25 2016-03-25 Cryogenic valve for cryogenic use

Publications (2)

Publication Number Publication Date
JP2017172754A JP2017172754A (en) 2017-09-28
JP6745123B2 true JP6745123B2 (en) 2020-08-26

Family

ID=59970860

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2016061711A Active JP6745123B2 (en) 2016-03-25 2016-03-25 Cryogenic valve for cryogenic use

Country Status (1)

Country Link
JP (1) JP6745123B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11655898B2 (en) 2018-11-01 2023-05-23 Kitz Corporation Cryogenic globe valve

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107701732A (en) * 2017-11-03 2018-02-16 中船黄埔文冲船舶有限公司 A kind of anti-corrosion stop valve
CN110748652B (en) * 2019-10-31 2021-02-23 南通龙源电站阀门有限公司 Vacuum die-casting stop valve of hydraulic pump
CN110906011B (en) * 2019-12-13 2024-06-14 鞍山电磁阀有限责任公司 Electrohydraulic integrated control valve
CN111140927A (en) * 2020-01-03 2020-05-12 珠海格力电器股份有限公司 Humidifying assembly with self-cleaning function, air conditioner and self-cleaning control method
CN111765254A (en) * 2020-06-16 2020-10-13 河南陶恩机械有限公司 Liquid nitrogen cold-charging valve seat structure of gray iron stop valve
CN113983214A (en) * 2021-10-20 2022-01-28 上海沪东造船阀门有限公司 Manual switch ultra-low temperature stop check valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11655898B2 (en) 2018-11-01 2023-05-23 Kitz Corporation Cryogenic globe valve

Also Published As

Publication number Publication date
JP2017172754A (en) 2017-09-28

Similar Documents

Publication Publication Date Title
JP6745123B2 (en) Cryogenic valve for cryogenic use
JP4791547B2 (en) Valve seal packing structure for valves
WO2013129560A1 (en) Trunnion ball valve for high pressure, and hydrogen station
US20120168659A1 (en) Butterfly valve
US20160178067A1 (en) Valve body and seat with tongue and groove connection
US9115812B2 (en) Plug valve with a spring biased plug
KR102223477B1 (en) High-pressure trunnion ball valve and hydrogen station using same
US20120211690A1 (en) Ball Valves and Associated Methods
JP5002026B2 (en) Actuator assembly structure of fluid control valve and fluid control valve formed by the structure
US7988127B2 (en) Valve with self-expanding seals
US9395019B2 (en) Device for sealing a valve
US10267424B2 (en) Butterfly valve seat with seat cover
US11181201B2 (en) EZE-Top ball valve
CN105299258A (en) Through type female thread self-locking ball valve
JP2012013141A (en) Trunnion type ball valve
US10969030B2 (en) Bushing having a shaft seal
JP2017172755A (en) Spherical valve
RU2445537C1 (en) Stop valve
JP5850876B2 (en) Ball valve
CN208997377U (en) A kind of Bidirectional hard seal floating ball valve
JP5911668B2 (en) Valve actuator mounting structure
US3007671A (en) Replacement valve assembly
JP7213033B2 (en) Trunnion type ball valve for high pressure and hydrogen station using the same
JP5776497B2 (en) Poppet valve
US5374030A (en) Valve actuating mechanism

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20190304

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20191225

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20200107

A521 Request for written amendment filed

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20200302

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20200707

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20200803

R150 Certificate of patent or registration of utility model

Ref document number: 6745123

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250