JP2017166621A - Encapsulation type gate valve - Google Patents

Encapsulation type gate valve Download PDF

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JP2017166621A
JP2017166621A JP2016053637A JP2016053637A JP2017166621A JP 2017166621 A JP2017166621 A JP 2017166621A JP 2016053637 A JP2016053637 A JP 2016053637A JP 2016053637 A JP2016053637 A JP 2016053637A JP 2017166621 A JP2017166621 A JP 2017166621A
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valve
bonnet
valve body
gas
opening
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JP6529453B2 (en
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久仁 田浦
Kuni Taura
田浦　　久仁
真本　英光
Eiko Shinmoto
英光 真本
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Kurimoto Ltd
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Abstract

PROBLEM TO BE SOLVED: To reduce an amount of use of encapsulation fluid.SOLUTION: This invention relates to a shutting-off gate valve V for harmful gas pipe passage P such as coke oven gas and the like. This valve comprises: a valve case 1 having bonnet 5; a valve body 2 in the valve case; a valve shaft 3 extending from the valve body to pass through the bonnet; and a valve shaft ascending or descending mechanism 4 at an upper part of the bonnet. A clearance 13 with respect to the valve case around the valve body is sealed against water or gas, the valve body is stored in the bonnet and the valve is opened. A piston 20 partitioning inside of the bonnet 5 in a vertical direction in water-tight or gas-tight relation is arranged at the valve shaft 3. The valve body 2 is descended to cause the valve body*valve case valve seat 12 to be overlapped, water [a] is fed into a space 13 to make a water-tight state around the valve seat. When the pipe passage P is released, as indicated by a dotted line, at this time, the opening or closing valve 23 is released to discharge gas out of the bonnet or to close the opening or closing valve 23, and the opening or closing valve 25 is released to discharge gas into the space 13 through the bypass pipe passage 24. When the valve is closed from the valve opened state, the opening or closing valve 25 is closed, the opening or closing valve 23 is released and the valve body 2 is caused to descend by the ascending or descending mechanism 4.SELECTED DRAWING: Figure 1

Description

この発明は、化学、製鉄プラントなどで使用される液体や気体、例えば、コークス炉ガス（ＣＯＧ（coke oven gas））等の有害ガス管路等の遮断用封止式仕切弁に関するものである。   The present invention relates to a sealed gate valve for shutting off liquids and gases used in chemistry, steel manufacturing plants, and the like, for example, harmful gas pipes such as coke oven gas (COG).

上記有害ガス管路等に介設される遮断弁として、本願に係る発明の一実施形態を示す図１、図２を参照して説明すると、上部にボンネット５を有する弁箱１と、その弁箱１内に昇降可能に設けた弁体２と、その弁体２から上方に延びてボンネット５を貫通する弁軸３と、ボンネット５の上部に設けた弁軸３を昇降させる昇降機構４とから成る仕切弁Ｖがある（特許文献１図１〜図４参照）。
この仕切弁Ｖにおいて、弁体２の周回りの弁箱１との間１３に水や気体（窒素等）の流体ａを漏れなく封入し（水封又は気封し）、弁体２をボンネット５内に収納して開弁する水封・気封式のものがある（以下、両者を含めて「封止式仕切弁」と称する）。 As a shut-off valve interposed in the harmful gas pipe or the like, referring to FIGS. 1 and 2 showing an embodiment of the invention according to the present application, a valve box 1 having a bonnet 5 in the upper portion, and the valve A valve body 2 provided in the box 1 so as to be movable up and down; a valve shaft 3 extending upward from the valve body 2 and penetrating through the bonnet 5; and a lifting mechanism 4 for moving up and down the valve shaft 3 provided above the bonnet 5; There is a gate valve V (see Patent Document 1 FIGS. 1 to 4).
In this gate valve V, a fluid a such as water or gas (nitrogen or the like) is sealed without leakage (water sealed or air sealed) 13 between the valve box 1 around the valve body 2 and the valve body 2 is bonneted. There are water-sealed and air-sealed types that are housed in 5 and open (hereinafter, both are referred to as “sealed gate valves”).

実開平４−１３４９８１号公報Japanese Utility Model Publication No. 4-134981

この封止式仕切弁Ｖにおいて、弁体２をボンネット５内に収納するため、弁体２の周回りの弁箱１との間１３に入れた流体ａは、ボンネット５内にも入ることとなる。弁体２が入るボンネット５は、容量も大きく、そのボンネット５内に流体ａを入れる（封入する）にはかなりの時間を要する。また、ボンネット５は弁箱１と一体となっており、両者１、５に入れられた流体ａによる受圧面積が広いため、弁箱１の変位量（変形量）が大きく、弁体２とのシール性が低下する恐れがある。   In the sealed gate valve V, the fluid a put in the space 13 between the valve body 1 and the periphery of the valve body 2 in order to store the valve body 2 in the bonnet 5 also enters the bonnet 5. Become. The bonnet 5 into which the valve body 2 enters has a large capacity, and it takes a considerable time to put (enclose) the fluid a in the bonnet 5. Further, since the bonnet 5 is integrated with the valve box 1 and the pressure receiving area by the fluid a put in the both 1 and 5 is wide, the displacement amount (deformation amount) of the valve box 1 is large, There is a risk that the sealing performance will deteriorate.

この発明は、以上の実状の下、上記流体ａの使用量を低減することを課題とする。   This invention makes it a subject to reduce the usage-amount of the said fluid a under the above actual condition.

上記課題を達成するため、この発明は、上記ボンネット５内部を水密又は気密に上下に仕切るピストンを弁軸に設けることとしたのである。
このようにすれば、水密又は気密用の流体の使用量は、弁体２の周回りの弁箱１との間と、弁体とピストンの間となるため、従来に比べれば、少量となって、受圧面積も減少する。 In order to achieve the above object, according to the present invention, a piston for partitioning the inside of the bonnet 5 in a watertight or airtight manner up and down is provided on the valve shaft.
In this way, the amount of water-tight or air-tight fluid used is between the valve box 1 around the valve body 2 and between the valve body and the piston. Thus, the pressure receiving area also decreases.

この発明の具体的な構成としては、上部にボンネットを有する弁箱と、その弁箱内に昇降可能に設けた弁体と、その弁体から上方に延びてボンネットを貫通する弁軸と、ボンネット上部に設けた弁軸を昇降させる昇降機構とから成り、弁体の周回りの弁箱との間を、水封又は気封し、弁体をボンネット内に収納して開弁する封止式仕切弁において、前記ボンネット内部を水密又は気密に上下に仕切るピストンを弁軸に設けた構成を採用することができる。   As a specific configuration of the present invention, a valve box having a bonnet on the upper part, a valve body provided in the valve box so as to be movable up and down, a valve shaft extending upward from the valve body and penetrating the bonnet, and a bonnet It consists of a lifting mechanism that lifts and lowers the valve stem provided at the top, and seals with a valve box around the valve body with water or air sealing, and the valve body is housed in a bonnet and opened. In the gate valve, it is possible to adopt a configuration in which a piston that partitions the inside of the hood up and down in a watertight or airtight manner is provided on the valve shaft.

この構成の封止式仕切弁は、例えば、呼び径：６００ｍｍ〜３０００ｍｍのものを対象とし、ピストンのボンネット内の閉弁時の上下方向の位置は、管路Ｐの流体封止による遮断が確実に行えるように、実験などによって適宜に設定する。
この構成において、上記ボンネットのピストンより上部に開閉弁を設けて、ピストンの昇降時、ボンネット内の給排気（給排水）をし得るようにすれば、ボンネット内が円滑に給排気（給排水）されるため、弁体の昇降作用が円滑になる。
また、上記ボンネットのピストンより上部から前記弁体の周回りの弁箱との間に開閉弁を介在したバイパス管路を形成し、前記開閉弁の開放状態で、ボンネットのピストンより上部と、前記弁体の周回りの弁箱との間で、流体が行き来可能とすれば、ボンネット内の流体を外気に放出することがなくなる。 The sealed gate valve having this configuration is, for example, one having a nominal diameter of 600 mm to 3000 mm, and the position in the vertical direction when the valve is closed in the hood of the piston is surely blocked by fluid sealing of the pipe P. As appropriate, it is set appropriately by experimentation.
In this configuration, if an on-off valve is provided above the piston of the bonnet so that air can be supplied / exhausted (supply / drainage) in the bonnet when the piston is raised and lowered, the inside of the bonnet is smoothly supplied / exhausted (supply / drainage). Therefore, the raising / lowering action of a valve body becomes smooth.
In addition, a bypass pipe having an on-off valve interposed between the upper part of the bonnet piston and the valve box around the valve body is formed, and in the open state of the on-off valve, the upper part of the bonnet piston, If the fluid can go back and forth between the valve box around the valve body, the fluid in the bonnet will not be released to the outside air.

この発明は、以上のように構成したので、封止用の流体量を少なくすることが出来て経済的であるとともに、弁箱等の受圧面積も少なくし得るため、シール性が低下する恐れも少なくなる。   Since the present invention is configured as described above, it is economical to reduce the amount of fluid for sealing, and the pressure receiving area of the valve box and the like can be reduced, so that the sealing performance may be lowered. Less.

この発明に係る仕切弁の一実施形態の一部切欠き側面図Partially cutaway side view of one embodiment of a gate valve according to the present invention 同実施形態の一部切欠き正面図Partially cutaway front view of the same embodiment 図１のＩ−Ｉ線断面図Sectional view taken along the line II of FIG. 図１のＩＩ−ＩＩ線断面図II-II sectional view of FIG.

この発明に係る仕切弁の一実施形態を図１〜図４に示し、この実施形態の仕切弁Ｖは、円筒状弁箱１と、弁体２と、その弁軸３とからなる仕切弁であって、ガス管路Ｐに介設されるものである。
弁箱１はその上部にボンネット５を有し、上記弁軸３は弁体２から上方に延びてボンネット５内を貫通して昇降機構４に至っている。この昇降機構４は、弁軸３の上部をラックとし、そのラックに噛み合うピニオンをハンドル６によって回転させることによって弁軸３を昇降させて弁体２を昇降する。ハンドル６に代えて電動等の駆動機を採用し得る。 1 to 4 show an embodiment of a gate valve according to the present invention. A gate valve V of this embodiment is a gate valve composed of a cylindrical valve box 1, a valve body 2, and a valve shaft 3 thereof. Therefore, the gas pipe P is interposed.
The valve box 1 has a bonnet 5 at the upper portion thereof, and the valve shaft 3 extends upward from the valve body 2 and penetrates through the bonnet 5 to the lifting mechanism 4. The elevating mechanism 4 uses the upper portion of the valve shaft 3 as a rack, and rotates a pinion engaged with the rack by a handle 6 to elevate and lower the valve body 2 by moving the valve shaft 3 up and down. Instead of the handle 6, an electric drive or the like can be adopted.

弁体２は、逆台形状の断面を有する円盤であって、リブ１１によって補強されている。その弁体弁座に対応する弁箱１には弁箱弁座１２が設けられており、両弁座がピッタリ重なり合うことによって閉弁する。
その両弁座が重なり合う弁箱１内における弁体２の全周に水密な空間１３が形成されており、この空間１３に弁箱１下部の流入口１４から水ａが流入可能となっている。
弁体２はその両側にガイド１５を有し、そのガイド１５は弁箱１及びボンネット５の内面の上下方向のガイドレール１６に嵌っている。このため、弁体２はそのガイドレール１６に沿って昇降する。 The valve body 2 is a disk having an inverted trapezoidal cross section and is reinforced by ribs 11. A valve box valve seat 12 is provided in the valve box 1 corresponding to the valve body valve seat, and the two valve seats are closed by overlapping exactly.
A watertight space 13 is formed around the entire circumference of the valve body 2 in the valve box 1 where the two valve seats overlap, and water a can flow into the space 13 from the inlet 14 at the bottom of the valve box 1. .
The valve body 2 has guides 15 on both sides thereof, and the guides 15 are fitted to vertical guide rails 16 on the inner surfaces of the valve box 1 and the bonnet 5. For this reason, the valve body 2 moves up and down along the guide rail 16.

以上の構成は従来と同様であって、この発明は、上記ボンネット５内部を水密又は気密に上下に仕切るピストン（閉塞蓋）２０を弁軸３に設けた（固定した）点が特徴である。
ピストン２０は、図４に示すように、ボンネット５内の水平断面と同じ平面形状をした平板にリブ２１を設け、その周囲の壁にシール材２２を有するとともに、上記ガイドレール１６に嵌る形状となっている。このため、弁軸３の昇降に伴ってこのピストン２０も水密に昇降する。
上記ボンネット５のピストン２０より上部に開閉弁２３が設けられ、また、その開閉弁２３の手前から分岐して上記空間１３に至るバイパス管路２４が設けられており、このバイパス管路２４にも開閉弁２５が設けられている。図中、２６はドレン弁である。 The above configuration is the same as that of the prior art, and the present invention is characterized in that the valve shaft 3 is provided (fixed) with a piston (blocking lid) 20 that partitions the inside of the bonnet 5 in a watertight or airtight manner.
As shown in FIG. 4, the piston 20 is provided with a rib 21 on a flat plate having the same planar shape as the horizontal cross section in the bonnet 5, a seal member 22 on the surrounding wall, and a shape that fits the guide rail 16. It has become. For this reason, the piston 20 also moves up and down in a watertight manner as the valve shaft 3 moves up and down.
An opening / closing valve 23 is provided above the piston 20 of the bonnet 5, and a bypass line 24 is provided which branches from the front of the opening / closing valve 23 to reach the space 13. An on-off valve 25 is provided. In the figure, 26 is a drain valve.

この実施形態の仕切弁Ｖは以上の構成であり図１、図２に示すように、弁体２を下降させて両弁座１２を重ね合わすとともに、上記空間１３に水ａを送り込むことによってその弁座回りを水密にする。これによって管路Ｐは確実に遮断される。このとき、両弁座は楔状に嵌り合うため、その嵌合は強固に密着して密封する。   The gate valve V of this embodiment is configured as described above, and as shown in FIGS. 1 and 2, the valve body 2 is lowered to overlap the valve seats 12, and the water a is fed into the space 13. Make the valve seats watertight. As a result, the pipe P is reliably blocked. At this time, since both valve seats fit in a wedge shape, the fitting is tightly sealed and sealed.

一方、この管路Ｐを開放する場合は、図１鎖線で示すように、弁体２を上昇させて、流体（ガス）ｂを管路Ｐ内に白抜き矢印のように流す（図２参照）。このとき、開閉弁２３を開放してボンネット５内を排気して円滑な弁体２の上昇を担保する。また、開閉弁２３を閉じ、開閉弁２５を開放してバイパス管路２４を介して空間１３（管路Ｐ）内に排気してもよい。
この開弁状態から、閉弁するには、開閉弁２５を閉じ、開閉弁２３を開放し、昇降機構４によって弁体２を下降させる。このとき、ボンネット５内は負圧となるが、開閉弁２３を介して吸気されながら弁体２の下降が行われるため、円滑な弁体２の下降を担保する。 On the other hand, when the pipe P is opened, as shown by a chain line in FIG. 1, the valve body 2 is raised and the fluid (gas) b flows through the pipe P as indicated by the white arrow (see FIG. 2). ). At this time, the on-off valve 23 is opened and the inside of the bonnet 5 is exhausted to ensure a smooth rise of the valve body 2. Alternatively, the on-off valve 23 may be closed, the on-off valve 25 may be opened, and the space 13 (the pipe P) may be exhausted via the bypass pipe 24.
To close the valve from this open state, the on-off valve 25 is closed, the on-off valve 23 is opened, and the valve body 2 is lowered by the elevating mechanism 4. At this time, the inside of the bonnet 5 has a negative pressure, but the valve body 2 is lowered while being sucked in through the on-off valve 23, so that the valve body 2 is smoothly lowered.

また、開弁作用時、開閉弁２３を閉じ、開閉弁２５を開放した状態で、昇降機構４によって弁体２を上昇させると、ボンネット５内の流体はバイパス管路２４を介して配管Ｐ内に流入して、円滑な弁体２の上昇を担保する。
一方、閉弁作用時には、同様に、開閉弁２３を閉じ、開閉弁２５を開放した状態で、弁体２を下降させると、ボンネット５内は負圧となるが、配管Ｐ内の流体（ガス）ｂがバイパス管路２４を介してボンネット５内に流入して円滑な弁体２の下降を担保する。この場合、開弁作用時には、上記のように、ボンネット５内の流体ｂはバイパス管路２４を介して配管Ｐ内に流入させる。
このように、バイパス管路２４によって、ボンネット５のピストン２０より上部と、弁体２の周回りの弁箱１との間で流体ｂが行き来可能とすれば、配管Ｐ内の流体ｂをボンネット５内に流出入させても開閉弁２３を開放しないかぎり、配管Ｐ内の流体ｂは外部に漏れることはない。このため、流体ｂが有害ガス等であっても支障がない。 Further, when the valve body 2 is raised by the elevating mechanism 4 with the on-off valve 23 closed and the on-off valve 25 open at the time of valve opening action, the fluid in the bonnet 5 flows into the pipe P through the bypass line 24. To ensure a smooth rise of the valve body 2.
On the other hand, at the time of the valve closing action, similarly, if the valve body 2 is lowered while the on-off valve 23 is closed and the on-off valve 25 is opened, the inside of the bonnet 5 becomes negative pressure, but the fluid (gas B) flows into the bonnet 5 through the bypass conduit 24 to ensure the smooth lowering of the valve body 2. In this case, when the valve is opened, the fluid b in the bonnet 5 is caused to flow into the pipe P through the bypass pipe 24 as described above.
In this way, if the fluid b can go back and forth between the upper part of the bonnet 5 above the piston 20 and the valve box 1 around the valve body 2 by the bypass conduit 24, the fluid b in the pipe P is allowed to flow through the bonnet. As long as the on-off valve 23 is not opened, the fluid b in the pipe P does not leak outside even if it flows into and out of the pipe 5. For this reason, there is no problem even if the fluid b is harmful gas or the like.

上記実施形態において、ボンネット５の平面断面形状は、図４に示す小判形に限らず、円形や四角形などと任意である。水に代えて、空気や窒素（Ｎ２）等の不活性ガスを使用することができる。不活性ガスの場合、有害ガスや可燃性ガスの配管Ｐにおいて有効であり、その際、空間１３内の圧力は配管Ｐ内の圧力より高くする。
また、上記実施形態はコークス炉ガスの配管路Ｐに介設した場合であったが、この発明に係る仕切弁Ｖは、管路を封止状態で開閉する管路、例えば、化学プラント等の管路に採用し得ることは勿論である。
このように、今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。この発明の範囲は、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 In the said embodiment, the planar cross-sectional shape of the bonnet 5 is not restricted to the oval shape shown in FIG. Instead of water, an inert gas such as air or nitrogen (N 2 ) can be used. In the case of an inert gas, it is effective in the piping P of harmful gas and combustible gas, and the pressure in the space 13 is made higher than the pressure in the piping P.
Moreover, although the said embodiment was a case where it installed in the piping path P of coke oven gas, the gate valve V which concerns on this invention is a pipe line which opens and closes a pipe line in a sealing state, for example, a chemical plant etc. Of course, it can be employed in the pipeline.
Thus, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

Ｖ 封止式仕切弁
ａ 流体（水，窒素ガス）
ｂ 流体（ガス）
１ 弁箱
２ 弁体
３ 弁軸
４ 昇降機構
５ ボンネット
６ 昇降機構のハンドル
１１ 弁体のリブ
１２ 弁箱弁座
１３ 弁体回りの空間
２０ ピストン
２１ ピストンのリブ
２２ ピストン周りのシール材 V Sealed gate valve a Fluid (water, nitrogen gas)
b Fluid (gas)
DESCRIPTION OF SYMBOLS 1 Valve box 2 Valve body 3 Valve shaft 4 Lifting mechanism 5 Bonnet 6 Lifting mechanism handle 11 Valve body rib 12 Valve box valve seat 13 Space around valve body 20 Piston 21 Piston rib 22 Sealing material around piston

Claims (3)

上部にボンネット（５）を有する弁箱（１）と、その弁箱（１）内に昇降可能に設けた弁体（２）と、その弁体（２）から上方に延びて前記ボンネット（５）を貫通する弁軸（３）と、前記ボンネット（５）上部に設けた前記弁軸（３）を昇降させる昇降機構（４）とから成り、前記弁体（２）の周回りの弁箱（１）との間（１３）を水封又は気封し、前記弁体（２）をボンネット（５）内に収納して開弁する封止式仕切弁（Ｖ）であって、
上記ボンネット（５）内部を水密又は気密に上下に仕切るピストン（２０）を弁軸（３）に設けたことを特徴とする封止式仕切弁。 A valve box (1) having a bonnet (5) at the top, a valve body (2) provided in the valve box (1) so as to be movable up and down, and extending upward from the valve body (2), the bonnet (5 ) And a lift mechanism (4) for raising and lowering the valve shaft (3) provided on the bonnet (5), and a valve box around the valve body (2). (1) is a sealed gate valve (V) that seals (13) with water or air, and stores and opens the valve body (2) in a bonnet (5),
A sealed gate valve characterized in that a piston (20) for partitioning the inside of the bonnet (5) in a watertight or airtight manner is provided on the valve shaft (3). 上記ボンネット（５）のピストン（２０）より上部に開閉弁（２３）を設けたことを特徴とする請求項１に記載の封止式仕切弁。   The sealed gate valve according to claim 1, wherein an on-off valve (23) is provided above the piston (20) of the bonnet (5). 上記ボンネット（５）のピストン（２０）より上部から前記弁体（２）の周回りの弁箱（１）との間（１３）に開閉弁（２５）を介在したバイパス管路（２４）を形成し、前記開閉弁（２５）の開放状態で、ボンネット（５）のピストン（２０）より上部と、前記弁体（２）の周回りの弁箱（１）との間（１３）で、流体（ａ）が行き来可能とした請求項１又は２に記載の封止式仕切弁。   A bypass line (24) with an open / close valve (25) interposed between the upper part of the bonnet (5) from the piston (20) to the valve box (1) around the valve body (2) (13). In the open state of the on-off valve (25), between the upper part from the piston (20) of the bonnet (5) and the valve box (1) around the valve body (2) (13), The sealed gate valve according to claim 1 or 2, wherein the fluid (a) can come and go.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020106064A (en) * 2018-12-27 2020-07-09 株式会社クボタ Diagnosis method for gate valve and gate valve diagnosis system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61142970U (en) * 1985-02-26 1986-09-03
JPH04134981U (en) * 1991-06-07 1992-12-15 株式会社クボタ Gate valve seat leakage measuring device
JP2014080996A (en) * 2012-10-15 2014-05-08 Kubota Corp Gate valve for high temperature

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61142970U (en) * 1985-02-26 1986-09-03
JPH04134981U (en) * 1991-06-07 1992-12-15 株式会社クボタ Gate valve seat leakage measuring device
JP2014080996A (en) * 2012-10-15 2014-05-08 Kubota Corp Gate valve for high temperature

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020106064A (en) * 2018-12-27 2020-07-09 株式会社クボタ Diagnosis method for gate valve and gate valve diagnosis system

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