JPH0347402B2 - - Google Patents
Info
- Publication number
- JPH0347402B2 JPH0347402B2 JP58187779A JP18777983A JPH0347402B2 JP H0347402 B2 JPH0347402 B2 JP H0347402B2 JP 58187779 A JP58187779 A JP 58187779A JP 18777983 A JP18777983 A JP 18777983A JP H0347402 B2 JPH0347402 B2 JP H0347402B2
- Authority
- JP
- Japan
- Prior art keywords
- valve
- valve stem
- graphite
- steam
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 39
- 229910002804 graphite Inorganic materials 0.000 claims description 38
- 239000010439 graphite Substances 0.000 claims description 38
- 238000012856 packing Methods 0.000 claims description 34
- 210000004907 gland Anatomy 0.000 claims description 15
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 1
- 239000010425 asbestos Substances 0.000 description 13
- 229910052895 riebeckite Inorganic materials 0.000 description 13
- 239000011230 binding agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910021382 natural graphite Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/16—Sealings between relatively-moving surfaces
- F16J15/18—Sealings between relatively-moving surfaces with stuffing-boxes for elastic or plastic packings
- F16J15/20—Packing materials therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Control Of Turbines (AREA)
Description
【発明の詳細な説明】 〔発明の属する技術分野〕 本発明は蒸気タービンの蒸気加減弁に関する。[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a steam control valve for a steam turbine.
蒸気タービンにおける蒸気加減弁は、高温高圧
の蒸気をエネルギーとする蒸気タービンの蒸気流
量を制御するという重要な機能を有している。従
つて、この弁はいつでも迅速確実な動作ができる
よう、弁棒とこれを軸方向で摺動可能なように支
持しているグランド部とが常に円滑な状態で係合
していることが要望される。
A steam control valve in a steam turbine has an important function of controlling the steam flow rate of the steam turbine, which uses high-temperature, high-pressure steam as energy. Therefore, in order for this valve to operate quickly and reliably at all times, it is desirable that the valve stem and the gland section that supports it so that it can slide in the axial direction always engage smoothly. be done.
第１図および第２図は従来の実施例を示し、第
１図は蒸気タービンの蒸気加減弁要部の構成図
で、第２図は第１図に示すＰ型の詳細図である。
２０は蒸気タービンの蒸気加減弁を示す。この蒸
気加減弁２０は、図示しない入口と出口４を備え
た弁ケーシング１を有しており、弁体３ａは弁ケ
ーシング１にボルト８で締め付けられている弁ス
タンド２によりその軸方向で摺動可能に保持され
ている。弁スタンド２の弁棒３の貫通部の孔、い
わゆるグランド部１４は、蒸気室１７側から上側
に向けて順次、グランドブツシユ６、アスベスト
系の押えリング１３ａ、弁棒３の外径の５〜６倍
の長さの範囲で設けられた蒸気洩れ防止用の複数
個のアスベスト系のパツキン７、アスベスト系の
押えリング１３ｂおよびブツシユ５とから構成さ
れている。そして、グランドブツシユ６の下端部
およびブツシユ５の上端部は、それぞれ弁スタン
ド２の内径側に設けられたねじ部と螺合するリン
グナツト１５およびねじブツシユ１２によつて支
持されている。弁棒３はグランドブツシユ６とブ
ツシユ５とによつて支承されるとともに、前記複
数個のアスベスト系のパツキン７によつて蒸気室
１７内から蒸気が外気側へ滉れ出さないようにシ
ールされている。また、弁棒３は、弁スタンド２
に支承された操作軸９にボルト１８で取り付けら
れたレバー１０の端部にサーボモータ１６からの
力が伝達されることによつて、レバー１０他端に
自在軸受１９により支承された連結棒１１を介し
て軸方向に摺動し、図示しない蒸気タービンへの
蒸気量を制御している。 1 and 2 show conventional embodiments, FIG. 1 is a block diagram of the essential parts of a steam control valve of a steam turbine, and FIG. 2 is a detailed view of the P type shown in FIG. 1.
20 indicates a steam control valve of the steam turbine. This steam control valve 20 has a valve casing 1 equipped with an inlet and an outlet 4 (not shown), and a valve body 3a is slid in the axial direction by a valve stand 2 that is fastened to the valve casing 1 with bolts 8. Possibly held. The hole in the penetrating part of the valve stem 3 of the valve stand 2, the so-called gland part 14, is formed in order from the steam chamber 17 side to the top: the gland bush 6, the asbestos-based retaining ring 13a, and the outer diameter 5 of the valve stem 3. It is composed of a plurality of asbestos-based gaskets 7 for preventing steam leakage provided in a range of ~6 times the length, an asbestos-based presser ring 13b, and a bush 5. The lower end of the gland bush 6 and the upper end of the bush 5 are supported by a ring nut 15 and a threaded bush 12, respectively, which are threaded into a threaded portion provided on the inner diameter side of the valve stand 2. The valve stem 3 is supported by a gland bush 6 and a bush 5, and is sealed by the plurality of asbestos-based packings 7 to prevent steam from leaking out from the steam chamber 17 to the outside air. ing. In addition, the valve stem 3 is connected to the valve stand 2.
By transmitting the force from the servo motor 16 to the end of the lever 10 attached with a bolt 18 to the operating shaft 9 supported on the lever 10, the connecting rod 11 supported on the other end of the lever 10 by a swivel bearing 19 The shaft slides in the axial direction through the shaft to control the amount of steam flowing to a steam turbine (not shown).
上記の構成において、アスベスト系のパツキン
７は、アスベストとグラフアイトとをある種の結
合剤で練り固めたものであり、アスベスト系の押
えリング１３ａ，１３ｂは、アスベスト繊維を主
成分とした編組パツキンであつて、アスベストは
公害問題によりやがて生産が中止される運命にあ
ることと、アスベスト系のパツキン７が高温蒸気
下の運転によつて結合剤、さらに高温ではアスベ
ストの結晶水の気発によつて重量が減量し、時間
とともに増締め効果がなくなつて蒸気もれを発生
する事故を引き起こすことがあつた。従つて、定
期点検時にはパツキン７をすべて新しいものに取
り換えることが必要で、メンテナンスコストが大
きくなつてしまう問題があり、かつ、アスベスト
に換わる廉価でかつ高温高圧下で信頼性に優れた
シール材を開発することが必であつた。 In the above configuration, the asbestos-based packing 7 is made by kneading asbestos and graphite together with a certain type of binder, and the asbestos-based holding rings 13a and 13b are braided packings mainly composed of asbestos fibers. However, the production of asbestos will eventually be discontinued due to pollution problems, and asbestos-based packing 7 is exposed to binding agents due to operation under high-temperature steam, and furthermore, at high temperatures, asbestos crystal water is released. As a result, the weight decreased, and over time the tightening effect was lost, leading to accidents such as steam leaks. Therefore, it is necessary to replace all the gaskets 7 with new ones during periodic inspections, which increases maintenance costs.Additionally, it is necessary to use a sealing material that is inexpensive and has excellent reliability under high temperature and high pressure as an alternative to asbestos. It was necessary to develop it.
本発明は上記のような点に鑑み、運転中におけ
る増締めや蒸気洩れによるトラブルをなくし、か
つパツキンの使用数量を減らして弁棒と該弁棒を
支持するグランド部との係合を常に円滑に保持
し、廉価で高温高圧下で信頼性の高いアスベスト
フリーの蒸気タービンの蒸気加減弁を提供するこ
とを目的とする。
In view of the above points, the present invention eliminates troubles caused by retightening and steam leakage during operation, and reduces the number of packings used to ensure smooth engagement between the valve stem and the gland that supports the valve stem. The purpose of the present invention is to provide an asbestos-free steam control valve for a steam turbine that is inexpensive and highly reliable under high temperature and high pressure conditions.
本発明によれば、蒸気加減弁の弁棒と弁スタン
ドの前記弁棒貫通部との間のグランド部領域に、
前記弁棒に沿つて複数個の高圧縮性のリング状グ
ラフアイトパツキンを設けて前記弁棒の外周面と
前記弁スタンドの弁棒貫通部の内周面とを気密に
封ずるとともに、前記グラフアイトパツキンの軸
方向両端部にそれぞれ前記グラフアイトパツキン
より密度の高いグラフアイトからなるリング状の
押えリングを設けることによつて達せられる。
According to the present invention, in the gland region between the valve stem of the steam control valve and the valve stem penetration part of the valve stand,
A plurality of highly compressible ring-shaped graphite packings are provided along the valve stem to airtightly seal the outer circumferential surface of the valve stem and the inner circumferential surface of the valve stem penetrating portion of the valve stand. This is achieved by providing ring-shaped retaining rings made of graphite having a higher density than the graphite packing at both axial ends of the graphite packing.
以下本発明を実施例を示す図面に基づいて詳細
に説明する。第３図ないし第５図は本発明の実施
例を示し、第３図は第１図に示すＰ部の詳細図
を、第４図は第３図に示す高圧縮性のグラフアイ
トパツキンの形状を、第５図はグラフアイト製押
えリングの形状を示すもので、図において第１図
および第２図に示すものと同じ構成要素のものに
は同じ符号を付してその説明を省略する。
The present invention will be described in detail below based on drawings showing embodiments. 3 to 5 show examples of the present invention, FIG. 3 is a detailed view of the P part shown in FIG. 1, and FIG. 4 is a shape of the highly compressible graphite packing shown in FIG. 3. FIG. 5 shows the shape of a graphite presser ring. In the figure, the same components as those shown in FIGS. 1 and 2 are given the same reference numerals, and their explanations will be omitted.
弁スタンド２の弁棒３の貫通部の孔、いわゆる
グランド部１４は、蒸気室１７側から上側に向け
て順次、グランドブツシユ６、複数個の間隔リン
グ２１、グラフアイト押えリング２３、複数個の
高圧縮性のグラフアイトパツキン２２、さらに前
記同様のグラフアイト押えリング２３およびブツ
シユ５とから構成されている。グランドブツシユ
６の下端部およびブツシユ５の上端部はそれぞれ
弁スタンド２の内径側に設けられたねじ部を螺合
するリングナツト１５およびブツシユ１２によつ
て支持されている。弁棒３はグランドブツシユ６
とブツシユ５によつて支承されるとともに、複数
個の高圧縮性のグラフアイトパツキン２２によつ
て蒸気室１７内から蒸気が外気側へ洩れ出さない
ようにシールされている。 The hole in the penetrating part of the valve stem 3 of the valve stand 2, the so-called gland part 14, is arranged in order from the steam chamber 17 side to the top: a gland bush 6, a plurality of spacing rings 21, a plurality of graphite retaining rings 23, and a plurality of graphite retaining rings 23. It is composed of a highly compressible graphite packing 22, a graphite retaining ring 23, and a bush 5 similar to those described above. The lower end of the gland bush 6 and the upper end of the bush 5 are supported by a ring nut 15 and a bush 12, respectively, which engage threaded portions provided on the inner diameter side of the valve stand 2. Valve stem 3 is ground bush 6
The steam chamber 17 is supported by a bush 5 and sealed by a plurality of highly compressible graphite packings 22 to prevent steam from leaking out to the outside air.
この高圧縮性のグラフアイトパツキン２２は、
第４図に示すように角形の断面形状を備えてリン
グ状に形成され、あらかじめ、外径Ｄは弁スタン
ド２の貫通孔の内径より若干小さく、内径ｄは弁
棒３の外径より若干大きく、例えば弁棒の外径が
20mm、弁スタンド貫通孔の内径が40mmのものにお
いて、高圧縮性のグラフアイトパツキン２２の内
径ｄは0.1〜0.25mmの範囲で大きく、外径Ｄは
0.025〜0.05mmの範囲で小さく、軸方向厚さt1は10
mm、密度は約1.4g／cm3のものである。そして、グ
ランド部１４に弁棒３の２〜３倍の範囲で組み込
まれ、ねじブツシユ１２を介して締め付けするこ
とによつて圧縮され、グランド部すなわち、弁ス
タンド２の弁棒３の貫通部の孔の内周面および弁
棒３の外周面とを気密に封じ、運転中に増締めを
行なうことや蒸気洩れすることなく、かつ弁棒３
の軸方向の摺動動作を円滑に保つている。 This highly compressible graphite packing 22 is
As shown in FIG. 4, it is formed into a ring shape with a rectangular cross-sectional shape, and the outer diameter D is slightly smaller than the inner diameter of the through hole of the valve stand 2, and the inner diameter d is slightly larger than the outer diameter of the valve stem 3. , for example, if the outer diameter of the valve stem is
20 mm, and the inner diameter of the valve stand through hole is 40 mm, the inner diameter d of the highly compressible graphite packing 22 is large in the range of 0.1 to 0.25 mm, and the outer diameter D is
Small in the range of 0.025-0.05mm, axial thickness t1 is 10
mm, and the density is approximately 1.4 g/cm 3 . Then, it is incorporated into the gland part 14 in a range of 2 to 3 times the size of the valve stem 3, and is compressed by tightening through the threaded bush 12. The inner circumferential surface of the hole and the outer circumferential surface of the valve stem 3 are airtightly sealed to prevent retightening during operation or steam leakage, and to prevent the valve stem 3 from leaking.
The sliding movement in the axial direction is maintained smoothly.
高圧縮性のグラフアイトパツキン２２は、膨張
天然黒鉛シート（商品名；Grafoil）を適当な寸
法に切り出し、巻き取つて金型でリング状に成形
されたもので、上記寸法のものにおいて、40〜50
Kg／cm2程度の締付面圧を加えることにつて圧縮率
が約５％となる弾力性を備え、低締付力でグラン
ド部１４をシールすることができる。また、この
高圧縮性のグラフアイトパツキン２２は気密性が
高く、かつ経時変化や加熱によつて減量すること
やクリーブがなく応力緩和を起さない。さらに、
低温においても脆化などの物性変化は起らない。
従つて、運転中に増締めする必要がなく長時間の
使用に耐え、かつ従来のアスベスト系のパツキン
に比べて約半分の弁棒３の外径の２〜３倍の長さ
の範囲で充分目的を達することができる。 The highly compressible graphite packing 22 is made by cutting an expanded natural graphite sheet (trade name: Grafoil) into appropriate dimensions, winding it up, and molding it into a ring shape using a mold. 50
It has elasticity such that the compression ratio is about 5% when applying a tightening surface pressure of about Kg/cm 2 , and the gland portion 14 can be sealed with a low tightening force. Further, this highly compressible graphite packing 22 has high airtightness, does not lose weight due to aging or heating, does not cleave, and does not cause stress relaxation. moreover,
Physical property changes such as embrittlement do not occur even at low temperatures.
Therefore, there is no need to retighten the valve during operation, it can withstand long-term use, and the length is sufficient within the range of 2 to 3 times the outer diameter of the valve stem 3, which is about half that of conventional asbestos-based gaskets. You can reach your goal.
一方、押えリング２３は、高圧縮性のグラフア
イトパツキン２２と同種のものであるが、密度が
グラフアイトパツキン２２に比べて高く約1.7g／
cm3であつて、第５図に示すように角形断面形状を
備えてリング状に形成されている。外、内径の寸
法は弁スタンドの貫通孔の内径および弁棒３の外
径に遊合するように設定され、高圧縮性のグラフ
アイトパツキン２２を両端から均一に圧縮してい
る。しかしながら、高圧縮性のグラフアイトパツ
キン２２とグラフアイト押えリング２３とは外観
上から判別することがむづかしいために、高圧縮
性のグラフアイトパツキン２２とグラフアイト押
えリング２３とを組み込み間違いしないように軸
方向厚さ変えて、例えば図に見るように押えリン
グ２３の軸方向厚さt2は、高圧縮性のグラフアイ
トパツキン２２の軸方向厚さt1よりは薄くしてあ
る。従つて、現場組込み時に間違いない正しいパ
ツキンの組込み作業ができる上に、アスベストフ
リーにすることができる。 On the other hand, the presser ring 23 is of the same type as the highly compressible graphite packing 22, but has a higher density than the graphite packing 22, about 1.7 g/
cm 3 and is formed into a ring shape with a square cross section as shown in FIG. The outer and inner diameter dimensions are set to match the inner diameter of the through hole of the valve stand and the outer diameter of the valve rod 3, and the highly compressible graphite packing 22 is uniformly compressed from both ends. However, since it is difficult to distinguish between the highly compressible graphite packing 22 and the graphite holding ring 23 from their appearance, it is important to avoid making mistakes when installing the highly compressible graphite packing 22 and graphite holding ring 23. For example, as shown in the figure, the axial thickness t 2 of the presser ring 23 is made smaller than the axial thickness t 1 of the highly compressible graphite packing 22. Therefore, it is possible to assemble the packing correctly without any mistakes at the time of on-site assembly, and it is also possible to make it asbestos-free.
本発明は上記のように、蒸気加減弁の弁棒と弁
スタンドの前記弁棒貫通部との間のグランド部領
域に、前記弁棒に沿つて複数個の高圧縮性のリン
グ状グラフアイトパツキンを設けて前記弁棒の外
周面と前記弁スタンドの弁棒貫通部の内周面とを
気密に封ずるとともに、前記グラフアイトパツキ
ンの軸方向両端部にそれぞれ前記グラフアイトパ
ツキンより密度の高いグラフアイトからなるリン
グ状の押えリングを設け、高圧縮性のグラフアイ
トパツキンは、わづかの締付面圧を加えることに
よつて弾性を発揮するので、低締付力でグランド
部をシールすることができる。しかも、高圧縮性
のグラフアイトパツキンは、気密性が高く、かつ
径時変化や加熱による減量またはクリープがなく
応力緩和を起こさない。従つてこの発明によれ
ば、運転中における増締めや蒸気洩れによるトラ
ブルをなくし、かつパツキンの使用数量を減らし
て弁棒と該弁棒を支持するグランド部との係合を
常に円滑に保持し、廉価で高温高圧下で信頼性の
高いアスベストフリーの蒸気タービンの蒸気加減
弁を提供することができる。
As described above, the present invention provides a plurality of highly compressible ring-shaped graphite packings along the valve stem in a ground region between the valve stem of the steam control valve and the valve stem penetration part of the valve stand. is provided to airtightly seal the outer circumferential surface of the valve stem and the inner circumferential surface of the valve stem penetrating portion of the valve stand, and a graphite packing having a higher density than the graphite packing is provided at each end of the graphite packing in the axial direction. The highly compressible graphite packing exhibits elasticity when a slight tightening surface pressure is applied, so the gland can be sealed with low tightening force. I can do it. Moreover, the highly compressible graphite packing has high airtightness, and does not undergo stress relaxation due to age change or heating-induced weight loss or creep. Therefore, according to the present invention, troubles due to retightening or steam leakage during operation can be eliminated, and the number of packings used can be reduced to ensure smooth engagement between the valve stem and the gland that supports the valve stem. , it is possible to provide an asbestos-free steam control valve for a steam turbine that is inexpensive and highly reliable under high temperature and high pressure conditions.
第１図および第２図は従来の実施例を示し、第
１図は蒸気タービンの蒸気加減弁要部の構成図、
第２図は第１図に示すＰ部の詳細図、第３図ない
し第５図は本発明の実施例を示し、第３図はその
要部詳細図、第４図は第３図に示す高圧縮性のグ
ラフアイトパツキンの詳細図、第５図は第３図に
示すグラフアイト押えリングの詳細図である。
２……弁スタンド、３……弁棒、２２……高圧
縮性のグラフアイトパツキン、２３……グラフア
イト製押えリング。
FIGS. 1 and 2 show conventional embodiments, and FIG. 1 is a configuration diagram of the main parts of a steam control valve of a steam turbine;
Fig. 2 is a detailed view of the P part shown in Fig. 1, Figs. 3 to 5 show embodiments of the present invention, Fig. 3 is a detailed view of the main part thereof, and Fig. 4 is shown in Fig. 3. A detailed view of the highly compressible graphite packing. FIG. 5 is a detailed view of the graphite presser ring shown in FIG. 3. 2...Valve stand, 3...Valve stem, 22...Highly compressible graphite packing, 23...Graphite retaining ring.
Claims (1)
グランド部領域に、前記弁棒に沿つて複数個の高
圧縮性のリング状グラフアイトパツキンを設けて
前記弁棒の外周面と前記弁スタンドの弁棒貫通部
の内周面とを気密に封ずるとともに、前記グラフ
アイトパツキンの軸方向両端部にそれぞれ前記グ
ラフアイトパツキンより密度の高いグラフアイト
からなるリング状の押えリングを設けたことを特
徴とする蒸気タービンの蒸気加減弁。1. A plurality of highly compressible ring-shaped graphite packings are provided along the valve stem in a gland area between the valve stem and the valve stem penetration part of the valve stand, so that the outer circumferential surface of the valve stem and the In addition to airtightly sealing the inner circumferential surface of the valve stem penetrating portion of the valve stand, ring-shaped retaining rings made of graphite having a higher density than the graphite packing are provided at both ends in the axial direction of the graphite packing. A steam control valve for a steam turbine characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18777983A JPS6081404A (en) | 1983-10-07 | 1983-10-07 | Steam control valve for steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18777983A JPS6081404A (en) | 1983-10-07 | 1983-10-07 | Steam control valve for steam turbine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6081404A JPS6081404A (en) | 1985-05-09 |
| JPH0347402B2 true JPH0347402B2 (en) | 1991-07-19 |
Family
ID=16212069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18777983A Granted JPS6081404A (en) | 1983-10-07 | 1983-10-07 | Steam control valve for steam turbine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6081404A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404925B (en) * | 2021-06-30 | 2023-06-02 | 扬州宝诺金属制品有限公司 | Multiple composite sealing leakage-proof valve rod device and processing technology thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113505A (en) * | 1981-12-25 | 1983-07-06 | Toshiba Corp | Gas leak preventive device of control valve |
| JPS58124863A (en) * | 1982-01-22 | 1983-07-25 | Nippon Pillar Packing Co Ltd | Packing |
-
1983
- 1983-10-07 JP JP18777983A patent/JPS6081404A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58113505A (en) * | 1981-12-25 | 1983-07-06 | Toshiba Corp | Gas leak preventive device of control valve |
| JPS58124863A (en) * | 1982-01-22 | 1983-07-25 | Nippon Pillar Packing Co Ltd | Packing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6081404A (en) | 1985-05-09 |
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