JPS62182213A - Structure of sealing valve for blast furnace - Google Patents
Structure of sealing valve for blast furnaceInfo
- Publication number
- JPS62182213A JPS62182213A JP2476186A JP2476186A JPS62182213A JP S62182213 A JPS62182213 A JP S62182213A JP 2476186 A JP2476186 A JP 2476186A JP 2476186 A JP2476186 A JP 2476186A JP S62182213 A JPS62182213 A JP S62182213A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- contact member
- valve body
- blast furnace
- annular contact
- 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
Links
- 238000007789 sealing Methods 0.000 title abstract description 3
- 239000000463 material Substances 0.000 claims abstract description 23
- 229920002379 silicone rubber Polymers 0.000 claims abstract description 16
- 239000004945 silicone rubber Substances 0.000 claims abstract description 16
- 229920001971 elastomer Polymers 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 7
- 229910052751 metal Inorganic materials 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 19
- 238000003780 insertion Methods 0.000 claims description 6
- 230000037431 insertion Effects 0.000 claims description 6
- 229910018487 Ni—Cr Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical group [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 15
- 229910000831 Steel Inorganic materials 0.000 abstract description 6
- 239000010959 steel Substances 0.000 abstract description 6
- 238000004073 vulcanization Methods 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 13
- 230000006378 damage Effects 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 229920001084 poly(chloroprene) Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 238000010073 coating (rubber) Methods 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 239000002355 dual-layer Substances 0.000 description 1
- 210000005069 ears Anatomy 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- -1 iron ore Chemical class 0.000 description 1
- 229910000623 nickel–chromium alloy Inorganic materials 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 150000003568 thioethers Chemical class 0.000 description 1
Landscapes
- Lift Valve (AREA)
- Blast Furnaces (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、高炉の炉頂における挿入装置のシール弁構造
に関する。さらに詳しくは、弁体側の環状当接部材を凸
状断面を有する金属基材で、一方、弁座側の環状当接部
材をほぼ平坦な当接面を有するゴムで、それぞれ構成し
た高炉シール弁構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seal valve structure for an insertion device at the top of a blast furnace. More specifically, a blast furnace seal valve in which the annular abutting member on the valve body side is made of a metal base material with a convex cross section, and the annular abutting member on the valve seat side is made of rubber with a substantially flat abutting surface. Regarding structure.
（従来の技術）
高炉の炉頂には、原料などを貯留して高炉に押入するバ
ンカ等の挿入装置が設けられている。これらの挿入装置
と高炉内または外部大気のあいだの気密を保持し、炉内
の圧力を一定に保つため、該装置の下部または上部には
シール弁が設けられる。(Prior Art) An insertion device such as a bunker is provided at the top of a blast furnace to store raw materials and push them into the blast furnace. In order to maintain airtightness between these insertion devices and the inside of the blast furnace or the outside atmosphere, and to keep the pressure inside the furnace constant, a sealing valve is provided at the bottom or top of the device.
第１図は、従来の高炉シール弁の一例の縦断面図であり
、第２図は、第１図に鎖線へで示した部分を拡大して示
したものである。FIG. 1 is a longitudinal sectional view of an example of a conventional blast furnace seal valve, and FIG. 2 is an enlarged view of the portion indicated by the chain line in FIG. 1.
弁体Ｉは、アーム２に取付けられ、弁座３とともにシー
ル弁を構成する。アーム２は軸２１に回転自在に取付け
られ、弁体１を必要に応じて開閉する。The valve body I is attached to the arm 2, and together with the valve seat 3 constitutes a seal valve. The arm 2 is rotatably attached to a shaft 21 and opens and closes the valve body 1 as required.
弁体ｌの環状当接部材であるパツキン４は、弁体１の上
面周辺部に、固定部材４１をかいして、ボルト４２によ
り取付けられる。パツキン４は、ネオブレーンゴムやシ
リコンゴム等からなり、ほぼ平坦な環状当接面を有して
いる。The gasket 4, which is an annular abutting member of the valve body 1, is attached to the periphery of the upper surface of the valve body 1 with a fixing member 41 and bolts 42. The packing 4 is made of neoprene rubber, silicone rubber, or the like, and has a substantially flat annular contact surface.
弁座３側の環状当接部材であるシートリング５は、ボル
ト５２により固定される。シートリング５は弁体ｌ側に
向かって凸の断面形状を有し、パツキン４との間をほぼ
線接触とし、さらに表面をネ１オブレーンラバーコーテ
ィング５１で覆ってシールを確実なものとする。The seat ring 5, which is an annular abutting member on the side of the valve seat 3, is fixed with a bolt 52. The seat ring 5 has a cross-sectional shape that is convex toward the valve body l side, and makes almost a line contact with the gasket 4, and furthermore, the surface is covered with a neo-brane rubber coating 51 to ensure a secure seal. .
このように、従来の高炉シール弁構造においては、鋼材
などの金属基材からなる凸断面の環状当接部材を弁座側
に配設し、これと弁体側のほぼ平坦なゴム（ネオプレー
ンまたはシリコンゴム）製のＬＱ状当接部材（パツキン
）とを互いに押圧して気密を保持する構造を採っている
。In this way, in the conventional blast furnace seal valve structure, an annular contact member with a convex cross section made of a metal base material such as steel is arranged on the valve seat side, and a substantially flat rubber (neoprene or silicone) contact member on the valve body side is arranged on the valve seat side. The LQ-shaped contact member (packet) made of rubber is pressed against each other to maintain airtightness.
（発明が解決しようとする問題点）
高炉シール弁構造は、炉内の圧力を一定に保つ重要な働
きをするものであり、シール不良は放置できない。とこ
ろが従来のシール弁の寿命は半年から一年ときわめて短
く、その取替に高炉の休風工事時間および休風工事費用
のおおくの部分を割く必要があった。とくにヘルレス挿
入装置の場合、シール弁が通常、４基、配設されている
ため、はとんど毎月のようにシール弁のパツキンやシー
トリングを取り替える必要があった。(Problems to be Solved by the Invention) The blast furnace seal valve structure plays an important role in keeping the pressure in the furnace constant, and a seal failure cannot be ignored. However, the lifespan of conventional seal valves is extremely short, ranging from six months to a year, and it is necessary to spend a large portion of the time and cost of shutting down the blast furnace to replace them. In particular, in the case of a healthless insertion device, there are usually four seal valves, so it was necessary to replace the seal valve seals and seat rings almost every month.
従って、本発明の目的は、上述の従来技術の問題点を解
決する、寿命の長い高炉シール弁構造を提供することで
ある。SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a long-life blast furnace seal valve structure that overcomes the problems of the prior art described above.
（問題点を解決するための手段）
上述の目的を達成するため、まず、シール弁損傷の原因
を究明した。この結果、シール弁損傷の原因は、次の二
つに要約できることを見い出した。(Means for solving the problem) In order to achieve the above-mentioned purpose, first, the cause of the damage to the seal valve was investigated. As a result, we found that the causes of seal valve damage can be summarized into the following two reasons.
■弁体を開いて原料を通過させる時に、原料の鉱石やコ
ークスの塊が弁体のゴム製のパツキンに当たる。このた
めパツキンが摩耗、損傷しシール不良にいたる。■When the valve body is opened to allow raw materials to pass through, lumps of raw material ore and coke hit the rubber gasket of the valve body. This causes the seal to wear out and get damaged, leading to a seal failure.
■弁体を開いて原料を通過させる時に、原料の鉱石やコ
ークスの粉がパツキンやシートリングの付着する。この
状態のまま弁体を閉じるので、シール弁内外の圧力差に
よりパツキンやシートリングがガスカットされる。■When the valve body is opened to allow raw materials to pass through, raw material ore and coke powder adhere to the packing and seat ring. Since the valve body is closed in this state, gas is cut from the gasket and seat ring due to the pressure difference between the inside and outside of the seal valve.
本発明者は研究を続けた結果、これらの原因（とくに■
）を取り除くため、弁体側の環状当接部材を鋼材などの
金属基材を耐摩耗性耐付着性材料で被覆して構成し、ゴ
ム製の環状当接部材を弁座側に配設することに想到した
。As a result of continued research, the inventor has identified these causes (especially ■
), the annular abutting member on the valve body side is constructed by covering a metal base material such as steel with a wear-resistant and anti-fouling material, and a rubber annular abutting member is placed on the valve seat side. I came up with this idea.
したがって、本発明にかかる高炉シール弁構造は、
高炉の炉頂における挿入装置のシール弁構造であって、
当接面が弁体側に向かって凸の断面を有する、耐摩耗性
耐ダスト付着性材料で被覆された金属基材からなる弁体
側環状当接部材を備える弁体と、前記弁体側環状当接部
材と気密に当接して弁体、弁座間をシールする、ほぼ平
坦な当接面を有するゴム製の弁座側環状当接部材を備え
る弁座と、を備えることを特徴とする。Therefore, the blast furnace seal valve structure according to the present invention is a seal valve structure for an insertion device at the top of a blast furnace, which comprises a wear-resistant and dust-adhesion resistant material whose contact surface has a convex cross section toward the valve body. a valve body comprising a valve body-side annular contact member made of a metal base material coated with a metal base material; and a substantially flat contact surface that airtightly contacts the valve body-side annular contact member to seal between the valve body and the valve seat. and a valve seat including a valve seat-side annular abutment member made of rubber.
さらに、シール弁損傷の原因（特に■の原因）を効果的
に解消するためには、
前記弁体側環状当接部材の金属基材は、原料粉の付着し
にくい耐摩耗性の金属パウダー溶射層（例えばニッケル
−クロム系自溶性合金材料）により被覆され、また、前
記弁体側環状当接部材は、強引裂シリコンゴム層で被覆
されたシリコンゴム（二層強化シリコンゴム）からなる
ことが好ましい。Furthermore, in order to effectively eliminate the causes of damage to the seal valve (especially cause ①), the metal base material of the annular contact member on the valve body side should be coated with a wear-resistant metal powder sprayed layer to which raw material powder does not easily adhere. (for example, a nickel-chromium self-fusing alloy material), and the valve body side annular contact member is preferably made of silicone rubber (double-layer reinforced silicone rubber) coated with a hard-tear silicone rubber layer.
（作用）
弁体側の断面が凸の金属製環状当接部材は、弁座側の平
坦な当接面を有するゴム製環状当接部材と線接触（接触
部位が面状とならず、ほぼ線状となる接触）をする。よ
って、弁体、弁座間の気密は確実に保持される。(Function) The metal annular contact member with a convex cross section on the valve body side makes line contact with the rubber annular contact member with a flat contact surface on the valve seat side (the contact area is not planar and almost linear). contact). Therefore, airtightness between the valve body and the valve seat is reliably maintained.
弁体側の環状当接部材は、耐摩耗性耐ダスト付着性材料
により被覆された金属（例えば鋼材）により構成されて
いる。したがって、シール弁を開いて原料を通過させる
時に、弁体側の環状当接部材を原料塊により（負傷する
おそれはない。また弁体側への原料粉の付着も、ゴム製
のパツキンの場合にくらべ大幅に減少する。さらに、弁
座側の環状当接部材を二層強化シリコンゴムとすること
により、従来にくらべ耐摩耗性が向上し、寿命が延長さ
れる。The annular abutment member on the valve body side is made of metal (for example, steel) coated with a wear-resistant and dust-resistant material. Therefore, when the seal valve is opened to allow raw material to pass through, the annular contact member on the valve body side is hit by the raw material lump (there is no risk of injury. Also, the adhesion of raw material powder to the valve body side is reduced compared to the case of rubber gaskets). Furthermore, by using double-layer reinforced silicone rubber for the annular contact member on the valve seat side, the wear resistance is improved compared to conventional ones, and the service life is extended.
（実施例）
次に本発明の実施例について、添付図面を参照しながら
詳しく説明する。(Example) Next, an example of the present invention will be described in detail with reference to the accompanying drawings.
第３図は、本発明にかかる高炉シール弁構造の環状当接
部材近傍の部分拡大縦断面図であって、第１図の鎖線Ａ
に対応する部分を示したものである。環状当接部材の近
傍以外は、第１図と同様に構成される。FIG. 3 is a partially enlarged vertical cross-sectional view of the vicinity of the annular contact member of the blast furnace seal valve structure according to the present invention, showing the chain line A in FIG.
This shows the part corresponding to . The structure is the same as that in FIG. 1 except for the vicinity of the annular abutting member.
弁体１の環状当接部材６は、鋼材を基材とし、表面を耐
摩耗性耐ダスト付着性材料層である金属パウダー溶射層
６１により被覆している。金属パウダー溶射層６１は、
たとえばニッケル−クロム系自溶性合金材料をパウダー
溶射することにより形成される。環状当接部材６は弁座
３側に向って凸の断面を存し、ボルト６２により弁体ｌ
に固定される。The annular abutting member 6 of the valve body 1 has a steel material as a base material, and its surface is coated with a metal powder sprayed layer 61 which is a layer of wear-resistant and dust adhesion-resistant material. The metal powder sprayed layer 61 is
For example, it is formed by powder spraying a nickel-chromium self-fluxing alloy material. The annular contact member 6 has a convex cross section toward the valve seat 3 side, and is attached to the valve body l by a bolt 62.
Fixed.
環状当接部材６の表面は、原料塊に当たることが多いの
で、耐摩耗性、耐ダスト付着性、機械的強度のいづれに
も優れていることが必要である。Since the surface of the annular contact member 6 often comes into contact with raw material lumps, it is necessary to have excellent wear resistance, dust adhesion resistance, and mechanical strength.
また、原料は鉄鉱石などの酸化物や硫化物を含むもので
あるから、耐食性、耐酸性にも優れていることが要求さ
れる。上記の金属パウダー溶射層、とくにニッケル−ク
ロム系合金材料はこの要請に応えるものである。Furthermore, since the raw material contains oxides and sulfides such as iron ore, it is required to have excellent corrosion resistance and acid resistance. The above metal powder sprayed layer, especially the nickel-chromium alloy material, meets this requirement.
一方、弁座３の環状当接部材７は、通常のシリコンゴム
を母材とし、表面を強引裂シリコンゴム層７１（二次加
硫品、厚さ約５１１ＩｌｌＩ）で覆って、同時に加硫成
形される（二層強化シリコンゴム）。環状当接部材７は
、固定部材７２を介して、ボルト７３により固定される
。On the other hand, the annular contact member 7 of the valve seat 3 is made of ordinary silicone rubber as a base material, and its surface is covered with a hard-tear silicone rubber layer 71 (secondary vulcanized product, thickness approximately 511IllI), and is simultaneously vulcanized and molded. (dual layer reinforced silicone rubber). The annular abutting member 7 is fixed with a bolt 73 via a fixing member 72 .
強引裂シリコンゴム層７１は、とくに耐摩耗性、強度に
優れている。ただし、環状当接部材７全体を強引裂シリ
コンゴムとした場合、環状当接部材７の肉厚が厚いため
、加硫時に生じた分解不純物がゴムの中に残存しクラン
クを発生する原因になる。したがって、強引裂シリコン
ゴム層７１の厚さは５ ｍｍ程度が適当である。The highly tearable silicone rubber layer 71 has particularly excellent wear resistance and strength. However, if the entire annular contact member 7 is made of hard-tear silicone rubber, the wall thickness of the annular contact member 7 is thick, so decomposed impurities generated during vulcanization remain in the rubber and cause cranking. . Therefore, the appropriate thickness of the strongly tearable silicone rubber layer 71 is about 5 mm.
（発明の効果）
本発明に従う高炉シール弁構造は、以上に説明したよう
に構成されているので、次のような効果を有する。(Effects of the Invention) Since the blast furnace seal valve structure according to the present invention is configured as described above, it has the following effects.
原料塊が直接光たりやすい弁体１側の環状当接部材６は
、鋼材等の金属を基材とし、その表面を耐摩耗性耐ダス
ト付着性材料（金属パウダー溶射層）６１で覆われてい
る。したがって原料塊による環状当接部材６のｔ貝傷ば
ほとんどない。また、該表面層６１は、ダストが付着し
にくい性質を有し、原料′扮の付着によるガスカットの
発生を減少させる。The annular contact member 6 on the side of the valve body 1 where the raw material mass is easily exposed to direct light is made of metal such as steel, and its surface is covered with a wear-resistant and dust-adhesion resistant material (metal powder sprayed layer) 61. There is. Therefore, there is almost no damage to the annular contact member 6 due to the raw material lump. Further, the surface layer 61 has a property that dust does not easily adhere to it, and reduces the occurrence of gas cut due to adhesion of raw materials.
さらに、弁座３例の環状当接部（イアを二層強化シリコ
ンゴムで構成することにより耐摩耗性を改善することが
できる。Furthermore, wear resistance can be improved by constructing the annular contact portions (ears) of the three valve seats with double-layer reinforced silicone rubber.
このように凸状断面を有する金属製の環状当接部材を弁
体１側に、一方、ゴム製の環状当接部材を弁座３側に持
っていくとともに、材料を改善することにより、シール
弁の寿命を大幅に延長し、従来の０．５〜１年に対し３
〜５年とすることができる。In this way, by moving the metal annular abutment member with a convex cross section toward the valve body 1 side and the rubber annular abutment member toward the valve seat 3 side, and by improving the material, a seal can be created. Significantly extends the life of the valve, reducing the lifespan to 3 years compared to the conventional 0.5 to 1 year.
It can be up to 5 years.
第１図は、従来の高炉シール弁構造の縦断面図、第２図
は、第１図の鎖線への部分を拡大して示す部分拡大図、
および
第３図は、本発明にかかる高炉シール弁構造の部分縦断
面図であって、第１図の鎖線へに対応する部分を示す図
である。FIG. 1 is a vertical cross-sectional view of a conventional blast furnace seal valve structure, and FIG. 2 is a partially enlarged view showing the portion taken along the chain line in FIG. 1.
3 is a partial longitudinal sectional view of the blast furnace seal valve structure according to the present invention, showing a portion corresponding to the chain line in FIG. 1.
Claims (4)
って、 当接面が弁体側に向かって凸の断面を有する、耐摩耗性
耐ダスト付着性材料で被覆された金属基材からなる弁体
側環状当接部材を備える弁体と、前記弁体側環状当接部
材と気密に当接して弁体、弁座間をシールする、ほぼ平
坦な当接面を有するゴム製の弁座側環状当接部材を備え
る弁座と、を備えることを特徴とする高炉シール弁構造
。(1) A seal valve structure for an insertion device at the top of a blast furnace, which is made of a metal base coated with a wear-resistant and dust-adhesion-resistant material, with the contact surface having a convex cross section toward the valve body. a valve body including a valve body side annular abutment member; and a valve seat side annular stop made of rubber having a substantially flat contact surface that airtightly abuts the valve body side annular abutment member to seal between the valve body and the valve seat. A blast furnace seal valve structure comprising: a valve seat having a contact member;
摩耗性耐ダスト付着性材料として耐摩耗性耐ダスト付着
性の金属パウダー溶射層を用いることを特徴とする特許
請求の範囲第１項記載の高炉シール弁構造。(2) A metal powder sprayed layer having wear resistance and dust adhesion resistance is used as the wear resistant and dust adhesion resistant material covering the metal base material of the annular abutting member on the valve body side. Blast furnace seal valve structure according to item 1.
自溶性合金材料溶射層であることを特徴とする特許請求
の範囲第２項記載の高炉シール弁構造。(3) The blast furnace seal valve structure according to claim 2, wherein the metal powder sprayed layer is a nickel-chromium self-fluxing alloy material sprayed layer.
層で被覆されたシリコンゴムからなることを特徴とする
特許請求の範囲第１項ないし第３項いづれかに記載の高
炉シール弁構造。(4) The blast furnace seal valve structure according to any one of claims 1 to 3, wherein the annular contact member on the valve body side is made of silicone rubber coated with a hard-tearable silicone rubber layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2476186A JPS62182213A (en) | 1986-02-06 | 1986-02-06 | Structure of sealing valve for blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2476186A JPS62182213A (en) | 1986-02-06 | 1986-02-06 | Structure of sealing valve for blast furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62182213A true JPS62182213A (en) | 1987-08-10 |
Family
ID=12147131
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2476186A Pending JPS62182213A (en) | 1986-02-06 | 1986-02-06 | Structure of sealing valve for blast furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62182213A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0221085A (en) * | 1988-07-06 | 1990-01-24 | Sanyo Electric Co Ltd | Hot water solenoid valve |
| CN101832412A (en) * | 2010-04-27 | 2010-09-15 | 鞍山市大孤山阀门厂 | Vertical wear-resisting rubber liner check valve |
| KR101299532B1 (en) * | 2010-10-29 | 2013-08-23 | 비아이 이엠티 주식회사 | Gate valve for float level gauge of lng storage tank |
| KR101386181B1 (en) * | 2012-01-19 | 2014-04-17 | 성도밸브 (주) | Clamp ring fixing structure of an butterfly valve |
| CN113090952A (en) * | 2021-03-26 | 2021-07-09 | 马鞍山钢铁股份有限公司 | Opening assisting device for check valve of large blast furnace blower unit and operation method |
-
1986
- 1986-02-06 JP JP2476186A patent/JPS62182213A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0221085A (en) * | 1988-07-06 | 1990-01-24 | Sanyo Electric Co Ltd | Hot water solenoid valve |
| CN101832412A (en) * | 2010-04-27 | 2010-09-15 | 鞍山市大孤山阀门厂 | Vertical wear-resisting rubber liner check valve |
| KR101299532B1 (en) * | 2010-10-29 | 2013-08-23 | 비아이 이엠티 주식회사 | Gate valve for float level gauge of lng storage tank |
| KR101386181B1 (en) * | 2012-01-19 | 2014-04-17 | 성도밸브 (주) | Clamp ring fixing structure of an butterfly valve |
| CN113090952A (en) * | 2021-03-26 | 2021-07-09 | 马鞍山钢铁股份有限公司 | Opening assisting device for check valve of large blast furnace blower unit and operation method |
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