JP2014070513A - Steam valve for steam turbine - Google Patents
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Abstract
Description
本発明は、発電プラントの蒸気タービン発電設備に設置される蒸気弁に関する。 The present invention relates to a steam valve installed in a steam turbine power generation facility of a power plant.
発電プラントにおける主な蒸気弁は主蒸気系統の主蒸気止め弁及び蒸気加減弁、再熱蒸気系統の再熱蒸気止め弁、インターセプト弁などから構成される。主蒸気止め弁及び再熱蒸気止め弁は危急時にタービンに流入する蒸気を遮断する目的で設置され、蒸気加減弁及びインターセプト弁はタービンに流入する蒸気量を調整し、タービンの制御を行なう目的で設置されている。尚、蒸気加減弁及びインターセプト弁は危急時の蒸気遮断機能も併せ持っている。 Main steam valves in a power plant are composed of a main steam stop valve and a steam control valve of the main steam system, a reheat steam stop valve of the reheat steam system, an intercept valve, and the like. The main steam stop valve and reheat steam stop valve are installed for the purpose of shutting off the steam flowing into the turbine in an emergency, and the steam control valve and intercept valve are for the purpose of adjusting the amount of steam flowing into the turbine and controlling the turbine. is set up. The steam control valve and intercept valve also have a steam shut-off function in case of emergency.
これらの蒸気弁のうち、例えば主蒸気止め弁は、弁ケーシング内部に設置される弁棒と弁棒に連動する弁体を弁棒の軸方向に作動させ、弁体と弁座の開度を開閉させることで蒸気遮断機能を有する（特許文献１）。 Among these steam valves, for example, the main steam stop valve operates the valve stem installed in the valve casing and the valve body linked to the valve stem in the axial direction of the valve stem, and the opening degree of the valve body and the valve seat is increased. It has a steam blocking function by opening and closing (Patent Document 1).
近年、発電プラント及びその設備に対する高効率、低コスト化が求められ、蒸気条件の高温・高圧化、メンテナンス間隔の長期化が実施されている。しかし、蒸気条件の高温・高圧化により、蒸気タービン発電設備はより高機能を有する材料が必要となる。また長期運用化に伴う信頼性低下も懸念される。 In recent years, there has been a demand for high efficiency and low cost for power plants and their facilities, and high temperature and high pressure of steam conditions and longer maintenance intervals have been implemented. However, due to the high temperature and high pressure of the steam conditions, the steam turbine power generation equipment requires materials with higher functions. In addition, there is a concern about the decrease in reliability associated with long-term operation.
例えば従来の主蒸気止め弁は、図５に示すような弁開状態において、弁体３は蒸気により弁棒２に対して軸直角方向の流体力を受ける。この流体力により、弁体３には回転方向の力が作用する。弁体３が回転すると、弁棒２及びその他の内蔵物との接触部において摩耗が生じ、蒸気弁内蔵物の不具合及び蒸気弁の機能不全に繋がる不具合を発生させる。 For example, in a conventional main steam stop valve, in a valve open state as shown in FIG. 5, the valve body 3 receives fluid force in a direction perpendicular to the axis with respect to the valve stem 2 by steam. Due to this fluid force, a force in the rotational direction acts on the valve body 3. When the valve body 3 rotates, wear occurs at the contact portion between the valve stem 2 and other built-in objects, causing problems with the built-in steam valve and malfunctions leading to malfunction of the steam valve.
弁体３の回転を防止する目的で、従来から廻り止めピン５が設置されているが、蒸気条件の高温・高圧化に伴い流体力が増加するため、廻り止めピン５の損傷が懸念される。このため廻り止めピン５に対して、損傷防止目的で高機能材料の適用が実施されている。また、長期運用時の信頼性低下防止対策としては、高機能材料の適用の他に、表面処理施工などで対応が取られている。 For the purpose of preventing the rotation of the valve body 3, a detent pin 5 has conventionally been installed. However, since the fluid force increases as the steam conditions increase in temperature and pressure, the detent pin 5 may be damaged. . For this reason, a high-functional material is applied to the detent pin 5 for the purpose of preventing damage. Moreover, as a measure for preventing reliability deterioration during long-term operation, in addition to the application of high-functional materials, measures are taken by surface treatment construction.
発電プラントでは高温、高圧の蒸気条件下で蒸気弁を使用することから、蒸気流路中に配置される構造物には耐エロージョン性、耐酸化性、耐摩耗性等が求められる。廻り止め用のピン５については、特に耐摩耗性が重要となるため、１２％クロム鋼やインコロイ(ニッケル‐クロム‐鉄が主成分)のような材料が用いられている。また、耐摩耗性の向上目的で窒化などの表面処理を施すことも広く用いられている。窒化処理は500〜600℃の温度条件下で母材表面に窒素を浸透させ窒化鉄の硬化層を生成させる技術である。 Since a power plant uses a steam valve under high-temperature and high-pressure steam conditions, the structure disposed in the steam flow path is required to have erosion resistance, oxidation resistance, wear resistance, and the like. For the pin 5 for rotation prevention, since wear resistance is particularly important, materials such as 12% chromium steel and incoloy (mainly nickel-chromium-iron) are used. Further, surface treatment such as nitriding is also widely used for the purpose of improving wear resistance. Nitriding is a technique for generating a hardened layer of iron nitride by infiltrating nitrogen into the surface of the base material at a temperature of 500 to 600 ° C.
これらの高機能材料の適用や、表面処理施工による対応は蒸気弁のコスト増加要因となっている。 The application of these highly functional materials and the response by surface treatment construction are factors that increase the cost of steam valves.
そこで、本発明は、弁体の回転に伴う不具合及びその対策によるコスト増加を抑制できる蒸気弁構造を採用し、低コスト、高信頼性の蒸気弁を提供することにある。 Therefore, the present invention employs a steam valve structure that can suppress a problem associated with rotation of the valve body and an increase in cost due to the countermeasure, and provides a low-cost and highly reliable steam valve.
上記課題を解決するため本発明は、開口部を有する弁座と、該弁座の開口部に対向して設けられた弁体と、該弁体を弁座に接離する方向に移動させる弁棒と、該弁棒を摺動自由に支持する円筒状の支持部材とを備えた蒸気タービン用蒸気弁において、弁体と弁棒の嵌合部で、弁体と弁棒が面接触にて係合することを特徴とする。 In order to solve the above-described problems, the present invention provides a valve seat having an opening, a valve body provided to face the opening of the valve seat, and a valve that moves the valve body in a direction to contact and separate from the valve seat. In a steam valve for a steam turbine comprising a rod and a cylindrical support member that slidably supports the valve stem, the valve body and the valve stem are in surface contact at a fitting portion between the valve body and the valve stem. It is characterized by engaging.
本発明によれば、弁体の回転に伴う不具合及びその対策によるコスト増加を抑制でき、低コスト、高信頼性の蒸気タービン用蒸気弁を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the malfunction accompanying the rotation of a valve body and the cost increase by the countermeasure can be suppressed, and the steam valve for steam turbines of low cost and high reliability can be provided.
まず最初に本発明の特徴の理解を容易にするため、従来の一般的な蒸気タービン用主蒸気止め弁について図４，５を用いて簡単に説明する。図４は、蒸気タービン用主蒸気止め弁の内部構造を概略的に示す断面図であり、図５は、図４に示した主蒸気止め弁の全開時の内部構造を示す図である。 First, in order to facilitate understanding of the features of the present invention, a conventional general steam stop valve for a steam turbine will be briefly described with reference to FIGS. 4 is a cross-sectional view schematically showing the internal structure of the main steam stop valve for a steam turbine, and FIG. 5 is a view showing the internal structure of the main steam stop valve shown in FIG. 4 when fully opened.
図４に示すように、主蒸気止め弁は、開口部７を有する弁座４と、開口部７に対向して設けられた弁体３と、弁体３を弁座４に接離する方向に移動させる弁棒２と、弁棒２を摺動自由に支持する円筒状の支持部材である衛帯筐８とをケーシング１に収納して構成されている。またケーシング１の内部には、弁座４によって上下に仕切られた弁室が形成されている。図示していないが弁室上部側は、蒸気流入口とつながっている。一方、弁室下部１０側は、図示しない蒸気流出口と繋がっている。 As shown in FIG. 4, the main steam stop valve includes a valve seat 4 having an opening 7, a valve body 3 provided to face the opening 7, and a direction in which the valve body 3 contacts and separates from the valve seat 4. The casing 1 is configured to accommodate a valve stem 2 to be moved to a position and a satellite casing 8 that is a cylindrical support member that supports the valve stem 2 in a slidable manner. In addition, a valve chamber partitioned up and down by a valve seat 4 is formed inside the casing 1. Although not shown, the upper side of the valve chamber is connected to the steam inlet. On the other hand, the valve chamber lower part 10 side is connected to a steam outlet (not shown).
弁棒２は、図示しない駆動手段によって上下方向に駆動する。図５に示すように弁棒が上方に移動することにより、弁棒２と連動する弁体３が弁座４から離れて上方に移動し、弁体３と弁座４との間に間隙が形成される。この間隙を介して蒸気が弁室上部から弁室下部１０へ流入する。 The valve stem 2 is driven in the vertical direction by a driving means (not shown). As shown in FIG. 5, when the valve stem moves upward, the valve body 3 interlocked with the valve stem 2 moves away from the valve seat 4, and a gap is formed between the valve body 3 and the valve seat 4. It is formed. Steam flows from the upper part of the valve chamber into the lower part 10 of the valve chamber through this gap.
ところで、図５に示すような弁開状態において、弁室上部では、蒸気は矢印で示すように垂直方向に対して直角な方向から流入し、開口部７を通過して弁室下部１０へ下方に流れ込む。そのため、弁体３は蒸気により弁棒２に対して軸直角方向の流体力を受ける。この流体力により、弁体３には弁棒２に対して回転方向の力が作用する。弁体３が回転すると、弁棒２及びその他の内蔵物との接触部において摩耗が生じ、蒸気弁内蔵物の不具合及び蒸気弁の機能不全に繋がる不具合を発生させる。そこで従来は、弁体３の廻り止め構造として、弁体３と弁体３内部に挿入されるブッシュ６および弁棒２を廻り止めピン５で互いに固定する構造が用いられている。 By the way, in the valve open state as shown in FIG. 5, in the upper part of the valve chamber, the steam flows from the direction perpendicular to the vertical direction as indicated by the arrow, passes through the opening 7, and descends to the lower part of the valve chamber 10. Flow into. Therefore, the valve body 3 receives a fluid force in a direction perpendicular to the axis with respect to the valve stem 2 by steam. Due to this fluid force, a force in the rotational direction acts on the valve body 3 on the valve body 3. When the valve body 3 rotates, wear occurs at the contact portion between the valve stem 2 and other built-in objects, causing problems with the built-in steam valve and malfunctions leading to malfunction of the steam valve. Therefore, conventionally, as a structure for preventing the rotation of the valve body 3, a structure in which the valve body 3 and the bush 6 inserted into the valve body 3 and the valve rod 2 are fixed to each other with a rotation pin 5 is used.
しかしながら、蒸気タービンの高効率化に伴い蒸気条件も高温・高圧化している。そのため、流体力が増加し、弁体３に作用する回転方向の力も増大し廻り止めピン５の損傷が懸念される。そのため廻り止めピン５に対して、損傷防止目的で高機能材料を適用したり、長期運用時の信頼性低下防止対策として、表面処理施工などが取られている。これらの対応は蒸気弁のコスト増加要因となる。 However, the steam conditions are also increased in temperature and pressure as the efficiency of the steam turbine increases. For this reason, the fluid force increases, the rotational force acting on the valve body 3 also increases, and there is a concern about the damage of the detent pin 5. For this reason, a high-functional material is applied to the anti-rotation pin 5 for the purpose of preventing damage, and surface treatment work is taken as a measure for preventing reliability deterioration during long-term operation. These measures increase the cost of the steam valve.
以上の従来構造とその課題を踏まえ、以下、本発明の実施形態を説明する。従来は廻り止めピンにて、弁体の回転防止構造を採用してきたが、本発明においては弁棒と弁体の嵌合部位に平面部を設置することで、平面部を介して弁棒と弁体を面接触にて係合させ、弁体の回転防止を実現できる構造とする。また、本発明において設置する平面部は耐摩耗性及び耐酸化性を考慮した平面構造とするものである。より詳しくは、以下の実施例にて説明する。 Based on the above conventional structure and its problems, embodiments of the present invention will be described below. Conventionally, a rotation prevention pin has been used to prevent the rotation of the valve body.However, in the present invention, a flat portion is installed at the fitting portion between the valve rod and the valve body, so that The valve body is engaged by surface contact, and the valve body can be prevented from rotating. In the present invention, the planar portion to be installed has a planar structure in consideration of wear resistance and oxidation resistance. More details will be described in the following examples.
図１は、本発明の実施例に係る蒸気タービン用主蒸気止め弁の内部構造を概略的に示した断面図である。図２は、図１に示した蒸気弁の弁体部の例を説明する図であって、図１のA−A断面図である。図３は、図１に示した蒸気弁の弁棒の廻り止め構造の例を説明する斜視図である。各図を通して同一の構成要素には同符号を付している。 FIG. 1 is a cross-sectional view schematically showing the internal structure of a main steam stop valve for a steam turbine according to an embodiment of the present invention. 2 is a view for explaining an example of the valve body portion of the steam valve shown in FIG. 1, and is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a perspective view for explaining an example of a rotation stop structure of the valve rod of the steam valve shown in FIG. The same components are denoted by the same reference symbols throughout the drawings.
本実施例では、主蒸気止め弁は、開口部７を有する弁座４と、開口部７に対向して設けられた弁体３と、弁体３を弁座４に接離する方向に移動させる弁棒２と、弁棒２を摺動自由に支持する円筒状の支持部材である衛帯筐８とをケーシング１に収納して構成されている点は従来同様である。 In the present embodiment, the main steam stop valve moves in a direction in which the valve seat 4 having the opening 7, the valve body 3 provided to face the opening 7, and the valve body 3 in contact with and away from the valve seat 4. It is the same as in the prior art that the valve rod 2 to be operated and the sanitary casing 8 that is a cylindrical support member that freely supports the valve rod 2 are housed in the casing 1.
次に本発明の特徴部である弁体３と弁棒２の嵌合部について説明する。図１に示すように、弁体３は、弁体本体の中央に弁棒２を挿入するための穴１２を有する。穴１２には、上部の縮径部１２ａと下部の拡径部１２ｂが形成されており、下部の拡径部１２ｂには円筒状の弁体用ブッシュ６が挿入されている。弁体用ブッシュ６は弁体３に締め嵌めによって固定されている。図示は省略しているが、弁体用ブッシュ６と弁棒２の表面には互いに係合する段差部が設けられており、これにより弁棒２の力を弁体部に伝えている。 Next, the fitting part of the valve body 3 and the valve stem 2 which is the characteristic part of this invention is demonstrated. As shown in FIG. 1, the valve body 3 has a hole 12 for inserting the valve stem 2 in the center of the valve body main body. The hole 12 is formed with an upper reduced diameter portion 12a and a lower enlarged diameter portion 12b, and a cylindrical valve body bush 6 is inserted into the lower enlarged diameter portion 12b. The valve body bush 6 is fixed to the valve body 3 by an interference fit. Although not shown, stepped portions that engage with each other are provided on the surfaces of the valve body bush 6 and the valve stem 2, thereby transmitting the force of the valve stem 2 to the valve body portion.
本実施例では、弁棒２の先端部位に丸棒状の表面の一部を平らにした平面部９が形成されている。平面部９は、図２（ａ）に示すように、弁棒２の表面２箇所に平行に一対で形成されている。一方、図２（ａ）に示すように、弁体３の穴１２のうち縮径部１２aの内面にも弁棒２の表面部に対応する平面部１１が２箇所形成されている。 In the present embodiment, a flat portion 9 is formed at the tip portion of the valve stem 2 by flattening a part of the round bar-like surface. As shown in FIG. 2 (a), the flat portion 9 is formed in a pair in parallel with two locations on the surface of the valve stem 2. On the other hand, as shown in FIG. 2A, two flat portions 11 corresponding to the surface portion of the valve stem 2 are formed on the inner surface of the reduced diameter portion 12 a in the hole 12 of the valve body 3.
組み立て時に弁体３に弁棒２を挿入した際、弁棒２の平面部９と弁体３の平面部１１とが対向して面接触するように嵌合固定する。弁棒２の平面部９と弁体３の平面部１１が面接触することで、弁体３が回転することが抑止される。よって、本実施例によれば弁体３に蒸気により弁棒２に対して軸直角方向の流体力がかかり、弁体３に回転方向の力が作用しても弁体３の回転を防ぐことかできる。これにより蒸気弁の高信頼性を維持できる。 When the valve stem 2 is inserted into the valve body 3 at the time of assembly, the flat portion 9 of the valve stem 2 and the flat portion 11 of the valve body 3 are fitted and fixed so as to face each other. When the flat surface portion 9 of the valve stem 2 and the flat surface portion 11 of the valve body 3 are in surface contact, the valve body 3 is prevented from rotating. Therefore, according to the present embodiment, a fluid force in a direction perpendicular to the axis is applied to the valve body 3 by steam on the valve body 3, and the rotation of the valve body 3 is prevented even if a force in the rotational direction acts on the valve body 3. I can do it. Thereby, the high reliability of the steam valve can be maintained.
また、本構造によれば、廻り止めピン５を用いる必要がないので、ピンのための高機能材料の使用や表面処理施工の必要がなくなりコストを低減することができる。 Moreover, according to this structure, since it is not necessary to use the detent | locking pin 5, use of the highly functional material for a pin and the necessity of surface treatment construction become unnecessary, and cost can be reduced.
よって、本実施例の構造によれば、弁体の回転に伴う不具合及びその対策によるコストを低減でき、低コスト、高信頼性の蒸気弁を提供することができる。 Therefore, according to the structure of the present embodiment, it is possible to reduce the problem associated with the rotation of the valve body and the cost due to the countermeasures, and to provide a low-cost and highly reliable steam valve.
本発明の他の実施例について説明する。実施例１では弁体３に平面部を設けた例を説明したが、ブッシュ６に平面部を設けても良い。 Another embodiment of the present invention will be described. In Example 1, although the example which provided the flat part in the valve body 3 was demonstrated, you may provide a flat part in the bush 6. FIG.
図２（ｂ）に示すように、弁棒２の表面に平面部９を設け、弁体用ブッシュ６の内周面に平面部９に対向する平面部１２を設け、弁棒２を弁体３に挿入した際に弁棒２の平面部９と弁体３の平面部１２とを面接触させる。 As shown in FIG. 2 (b), a flat portion 9 is provided on the surface of the valve stem 2, a flat portion 12 facing the flat portion 9 is provided on the inner peripheral surface of the valve body bush 6, and the valve stem 2 is connected to the valve disc. 3, the flat portion 9 of the valve stem 2 and the flat portion 12 of the valve body 3 are brought into surface contact.
図３に図２(ｂ)の構造を採用した場合の弁棒２のより詳細な３次元構造を示す。弁棒２は先端からある程度離れたところにカラー１４を装着するための縮径部１３を有し、縮径部１３の上下の表面に平面部９a及び平面部９ｂを有する。リング状の２分割部品であるカラー１４は、弁閉時に弁棒１の力を弁体に伝える部品であり、平面部９aは弁体用ブッシュ６の組立上設ける必要がある平面部である。 FIG. 3 shows a more detailed three-dimensional structure of the valve stem 2 when the structure of FIG. The valve stem 2 has a reduced diameter portion 13 for mounting the collar 14 at a certain distance from the tip, and has a flat portion 9 a and a flat portion 9 b on the upper and lower surfaces of the reduced diameter portion 13. The collar 14, which is a ring-shaped two-part, is a part that transmits the force of the valve stem 1 to the valve body when the valve is closed, and the flat part 9 a is a flat part that needs to be provided for assembly of the valve element bush 6.
弁体用ブッシュ６は、内部に弁棒２が挿入される円筒状の部材であって、弁体３に締り嵌めして固定する。ブッシュ外表面には拡径部と縮径部が設けられて段差が形成されている。一方、弁体３の穴１２の内面にも対応する段差が形成されており、ブッシュ側の段差と弁体３側の段差とが係合する。弁棒の力はカラー１４から弁体用ブッシュ６に伝わり、ブッシュ側の段差と弁体３側の段差とが係合することにより弁棒２の力が弁体３に作用する。 The valve body bush 6 is a cylindrical member into which the valve rod 2 is inserted, and is fixed to the valve body 3 by an interference fit. The outer surface of the bush is provided with an enlarged diameter portion and a reduced diameter portion to form a step. On the other hand, a step corresponding to the inner surface of the hole 12 of the valve body 3 is also formed, and the step on the bush side and the step on the valve body 3 side are engaged. The force of the valve stem is transmitted from the collar 14 to the valve body bush 6, and the force on the valve stem 2 acts on the valve body 3 by engaging the step on the bush side and the step on the valve body 3 side.
本実施例では、弁体用ブッシュ６の内面に、弁棒２の平面部９ｂに対向する平面部１２を設けて、弁棒２を弁体用ブッシュ６に挿入させた際、弁棒２の平面部９ｂとブッシュ側の平面部１２が面接触するようにして係合させる。この平面部同士の面接触により実施例１同様に弁体３に蒸気により弁棒２に対して軸直角方向の流体力がかかり、弁体３に回転方向の力が作用しても弁体３の回転を防ぐことかできる。 In this embodiment, when the flat surface portion 12 facing the flat surface portion 9 b of the valve stem 2 is provided on the inner surface of the valve body bush 6 and the valve rod 2 is inserted into the valve body bush 6, The flat portion 9b and the flat portion 12 on the bush side are engaged with each other so as to be in surface contact. Due to the surface contact between the flat surfaces, a fluid force in the direction perpendicular to the axis is applied to the valve body 2 by steam on the valve body 3 in the same manner as in the first embodiment, and the valve body 3 even if a rotational force acts on the valve body 3. Can prevent rotation.
また弁体用ブッシュ６の内周面に平面部を設けた場合、接触面積を大きくとることができ、磨耗が減らせてより信頼性を向上することができる。 Further, when a flat surface portion is provided on the inner peripheral surface of the valve body bush 6, the contact area can be increased, wear can be reduced, and the reliability can be further improved.
本実施例の構造によっても、廻り止めピン５を用いる必要がなく、廻り止めピンが損傷する懸念が無くなり、信頼性向上に繋がる。さらに部品員数の低減にも繋がり、コスト低減効果も見込める。 Even with the structure of the present embodiment, there is no need to use the non-rotating pin 5, and there is no fear that the non-rotating pin will be damaged, leading to improved reliability. In addition, the number of parts can be reduced, and cost reduction can be expected.
なお、各実施例で説明した各平面部は耐摩耗性及び耐酸化性が求められる部位となることから、必要に応じて表面処理を実施し、これらの要求を満たす構造とすればよい。なお、弁棒は摺動部であり、一般的に耐摩耗性及び耐酸化性が求められる部品となることから、高機能材の適用もしくは耐摩耗性及び耐酸化性を向上させる表面処理を用いることが多い。このため、平面部に対して表面処理を施工した場合でもコストアップとはならない。 In addition, since each plane part demonstrated in each Example becomes a site | part by which abrasion resistance and oxidation resistance are calculated | required, what is necessary is just to carry out surface treatment as needed and make it the structure which satisfy | fills these requirements. In addition, since the valve stem is a sliding part and is generally a component that requires wear resistance and oxidation resistance, use of a high-performance material or a surface treatment that improves wear resistance and oxidation resistance is used. There are many cases. For this reason, even when surface treatment is applied to the flat surface portion, the cost is not increased.
１ ケーシング
２ 弁棒
３ 弁体
４ 弁座
５ 廻り止めピン
６ 弁体用ブッシュ
７ 開口部
８ 衛帯筐
９、１１，１２ 平面部
１０ 弁室下部
１３ 縮径部
１４ カラー
DESCRIPTION OF SYMBOLS 1 Casing 2 Valve stem 3 Valve body 4 Valve seat 5 Non-rotating pin 6 Valve body bush 7 Opening part 8 Guard casing 9, 11, 12 Plane part 10 Valve chamber lower part 13 Reduced diameter part 14 Color
Claims (3)
を備えた蒸気タービン用蒸気弁において、
前記弁体と前記弁棒の嵌合部で、前記弁体と前記弁棒が面接触にて係合することを特徴とする蒸気タービン用蒸気弁。 A valve seat having an opening, a valve body provided opposite to the opening of the valve seat, a valve rod for moving the valve body in a direction to contact and separate from the valve seat, and sliding the valve rod A cylindrical support member for free support;
In a steam valve for a steam turbine provided with
A steam valve for a steam turbine, wherein the valve body and the valve stem are engaged by surface contact at a fitting portion between the valve body and the valve stem.
前記弁体は、中心に前記弁棒が挿入される穴を有する弁体本体と、前記穴に嵌合され、内部に前記弁棒が挿通される円筒状のブッシュとを有し、
前記ブッシュは内周面に形成された平面部を有し、
前記弁棒は、弁棒表面に形成され、前記ブッシュに形成された平面部と面接触する平面部を有することを特徴とする蒸気タービン用蒸気弁。 A steam valve for a steam turbine according to claim 1,
The valve body has a valve body body having a hole into which the valve stem is inserted at the center, and a cylindrical bush that is fitted into the hole and into which the valve stem is inserted,
The bush has a flat portion formed on the inner peripheral surface,
The said valve stem is formed in the valve stem surface, It has a plane part which surface-contacts with the plane part formed in the said bush, The steam valve for steam turbines characterized by the above-mentioned.
前記弁体は、中心に前記弁棒が挿入される穴と、該穴表面に形成された平面部とを有し、
前記弁棒は、弁棒表面に形成され、前記穴表面に形成された平面部と面接触する平面部を有することを特徴とする蒸気タービン用蒸気弁。 A steam valve for a steam turbine according to claim 1,
The valve body has a hole into which the valve stem is inserted in the center, and a flat portion formed on the surface of the hole,
The said valve stem is formed in the valve stem surface, It has a plane part which surface-contacts with the plane part formed in the said hole surface, The steam valve for steam turbines characterized by the above-mentioned.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012215445A JP2014070513A (en) | 2012-09-28 | 2012-09-28 | Steam valve for steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012215445A JP2014070513A (en) | 2012-09-28 | 2012-09-28 | Steam valve for steam turbine |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089035A (en) * | 2014-07-21 | 2014-10-08 | 江苏星河阀门有限公司 | Valve rod irrotational structure of corrugated pipe check valve |
| JP2018131962A (en) * | 2017-02-15 | 2018-08-23 | 三菱日立パワーシステムズ株式会社 | Steam valve and steam turbine facility |
| KR20230154321A (en) | 2022-02-01 | 2023-11-07 | 미츠비시 파워 가부시키가이샤 | Steam valves, and power generation systems |
| KR20230157394A (en) | 2022-02-01 | 2023-11-16 | 미츠비시 파워 가부시키가이샤 | Steam valve measuring method and steam valve measuring device |
| US11879553B2 (en) | 2018-12-28 | 2024-01-23 | Mitsubishi Heavy Industries, Ltd. | Steam valve and power generation system |
-
2012
- 2012-09-28 JP JP2012215445A patent/JP2014070513A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104089035A (en) * | 2014-07-21 | 2014-10-08 | 江苏星河阀门有限公司 | Valve rod irrotational structure of corrugated pipe check valve |
| JP2018131962A (en) * | 2017-02-15 | 2018-08-23 | 三菱日立パワーシステムズ株式会社 | Steam valve and steam turbine facility |
| US11879553B2 (en) | 2018-12-28 | 2024-01-23 | Mitsubishi Heavy Industries, Ltd. | Steam valve and power generation system |
| KR20230154321A (en) | 2022-02-01 | 2023-11-07 | 미츠비시 파워 가부시키가이샤 | Steam valves, and power generation systems |
| KR20230157394A (en) | 2022-02-01 | 2023-11-16 | 미츠비시 파워 가부시키가이샤 | Steam valve measuring method and steam valve measuring device |
| DE112022002451T5 (en) | 2022-02-01 | 2024-02-29 | Mitsubishi Heavy Industries, Ltd. | STEAM VALVE AND POWER GENERATION SYSTEM |
| DE112022002448T5 (en) | 2022-02-01 | 2024-04-18 | Mitsubishi Heavy Industries, Ltd. | MEASURING METHOD FOR STEAM VALVE AND MEASURING DEVICE FOR STEAM VALVE |
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