CN102787871B - Main steam valve of steam turbine - Google Patents
Main steam valve of steam turbine Download PDFInfo
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- CN102787871B CN102787871B CN201210235740.4A CN201210235740A CN102787871B CN 102787871 B CN102787871 B CN 102787871B CN 201210235740 A CN201210235740 A CN 201210235740A CN 102787871 B CN102787871 B CN 102787871B
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Abstract
The invention discloses a main steam valve of a steam turbine. The main steam valve comprises a valve body, a bonnet and a valve stem, wherein an upstream steam passage, a downstream steam passage, a valve stem assembly hole, a bonnet assembly hole and a valve seat are formed on the valve body. The bonnet mainly comprises an inner bonnet, an elastic sealing ring, a hold-down ring and a locating ring which are arranged in the bonnet assembly hole from the bottom up in sequence, and an outer bonnet which is fixed at the outer end of the bonnet assembly hole through fixing bolts, wherein the inner bonnet is subjected to self-tightening seal and bears most pressure, the outer bonnet bears less pressure, and the sealing effect is good. The upper end of the valve stem passes through a sleeve and is connected with a valve disc, and under the operation of the valve stem, the valve disc is matched with the valve seat to close or open the upstream steam passage and the downstream steam passage on the valve body. A sealing cartridge is arranged on the sleeve, and a sealing cone is arranged on the valve stem. When the valve disc and the valve seat are open, the valve stem is sealed with the sealing cartridge through the sealing cone, and the opening of the valve disc is limited by the sealing cone. The main steam valve has the characteristics that the main steam valve is good in sealing performance, low in production cost, high in practicability and capable of bearing high parameter steam.
Description
Technical field
The present invention relates to steam turbine, specifically a kind of Steam Turbine's Main Vaper Valve door.
Background technique
Steam Turbine's Main Vaper Valve door is the first valve of steam turbine, by the opening and closing of main vapour valve, realize supply and the cut-out of steam turbine steam, thereby main vapour valve moves for a long time in the steam ambient of High Temperature High Pressure, require main vapour valve to there is good sealing, in case the steam leakage of High Temperature High Pressure causes heat-energy losses, even security incident occurs.
Referring to Fig. 1: traditional Steam Turbine's Main Vaper Valve door comprises valve body 08, valve gap 010 and valve rod 01.Wherein, valve body 08 is hollow structure, and valve body 08 is provided with upstream stream passageway 012, downstream stream passageway 013, valve rod pilot hole and valve gap pilot hole; Upstream stream passageway 012 and the 013 radial misalignments setting of downstream stream passageway, valve body 08 internal surface between upstream stream passageway 012 and downstream stream passageway 013 is fixed with valve seat 014; On valve rod pilot hole, be equipped with sleeve 02 by limited step 015 and pressing plate 04, sleeve 02 stretches in valve rod pilot hole, periphery is located on the limited step 015 of valve rod pilot hole the inner, pressing plate 04 is fixed on the outer end of sleeve 02 by turnbuckle 016, outer end by valve rod pilot hole is spacing, and pressing plate is fixed on the outer end of valve rod pilot hole by fixing bolt 05, on pressing plate 04 and sleeve 02, be respectively equipped with the pilot hole that valve rod 01 is led, the pilot hole coaxial line on the pilot hole on pressing plate 04 and sleeve 02 is arranged.Valve gap 010 is overall structure, is assemblied on the valve gap pilot hole of valve body 08 by clamping bolt 011 sealing of large specification, relies on the tight power of large specification clamping bolt 011 and valve body 08 to produce contact stress, realizes sealing.The upper end of valve rod 01 is connected valve disc 09 through pressing plate 04 with the pilot hole on sleeve 02, and under the action of valve rod 01, the valve seat 014 on valve disc 09 and valve body 08 coordinates, and the upstream stream passageway 012 on valve body 08 and downstream stream passageway 013 are cut off or got through, for the freedom that ensures that valve rod 01 moves, between valve rod 01 and sleeve 02, must keep certain gap, the width in this gap is generally 0.20～0.35mm, so just make to form between valve rod 01 and sleeve 02 annular space of a wide approximately 0.20～0.35mm, this annular space can produce serious leakage vapour phenomenon, leak into machine room for fear of steam, on valve body 08, be provided with the first steam bleeder connection 06 and the second steam bleeder connection 07, these two steam bleeder connections communicate respectively at annular space, the first steam bleeder connection 06 is connected on No. three high-pressure heaters or oxygen-eliminating device, the second steam bleeder connection 07 is connected on gland steam heater.This main vapour valve has caused a large amount of quality steams to bleed in low level vapour system by the annular space between valve rod 01 and sleeve 02, cause certain heat-energy losses, increase the operation cost of steam turbine, on this ultra supercritical unit at high parameter steam or double reheat unit, more highlighted.In order to reduce steam leakage, conventional method is on the valve rod 01 in sleeve 02, to fill a gland sleeve 03, although the method can play certain leak stopping effect, it has little effect, the phenomenon that still exists a large amount of quality steams to leak, poor reliability.
In addition, above-mentioned integrally-built valve gap 010 relies on clamping bolt 011 sealing to be assemblied on the valve gap pilot hole of valve body 08 completely, in the steam ambient of High Temperature High Pressure, the pressure that valve gap 010 bears is large, on this ultra supercritical unit at high parameter steam or double reheat unit, also particularly highlight, in order to ensure the reliable sealing of valve gap 010 and constant intensity, require clamping bolt 011 to there is good structural strength, and the structural strength of clamping bolt 011 improves, by the material of clamping bolt 011 is upgraded, and the increase of specification (comprising diameter and length) realization, this has not only increased the manufacture cost of main vapour valve, and more seriously, along with the increase of clamping bolt 011, to the design of clamping bolt, difficulty of processing also increases thereupon, the clamping bolt of increase valve gap simply certainly will also damage the structural stress of valve gap and valve body, thereby make whole main vapour valve design, difficulty of processing increases, shorten working life, manufacture Efficiency Decreasing, enterprise's manufacture cost significantly increases.
Summary of the invention
The object of the invention is to: for above-mentioned the deficiencies in the prior art, provide a kind of good seal performance, reliable and stable, the convenient Steam Turbine's Main Vaper Valve door that designs processing, low cost of manufacture, can bear high parameter steam.
Above-mentioned technical purpose of the present invention is achieved through the following technical solutions, and a kind of Steam Turbine's Main Vaper Valve door, comprising:
-valve body, described valve body is provided with upstream stream passageway, downstream stream passageway, valve rod pilot hole and valve gap pilot hole, on valve body between upstream stream passageway and downstream stream passageway, be fixed with valve seat, on valve rod pilot hole, be equipped with sleeve by limited step and pressing plate, on pressing plate and sleeve, be respectively equipped with the pilot hole that valve rod is led;
-valve gap, described valve bonnet seal is assemblied on the valve gap pilot hole of valve body;
-valve rod, the upper end of described valve rod is connected valve disc through pressing plate with the pilot hole on sleeve, between valve rod and sleeve, there is annular space, this annular space communicates with the first steam bleeder connection being connected on valve body, under the action of valve rod, valve seat on valve disc and valve body coordinates, and the upstream stream passageway on valve body and downstream stream passageway are cut off or got through; The inner place of pilot hole of described sleeve is provided with stuffing box gland, described valve rod is provided with sealing cone near inner place, cage guiding hole, in the time that valve disc and valve seat are opened, valve rod is realized sealing by the stuffing box gland on sealing cone and sleeve, and does spacing by sealing cone to the aperture of valve disc and valve seat.
Described valve gap is mainly by being assemblied in successively from top to bottom interior valve gap in valve gap pilot hole, elastic seal ring, hold-down ring, positioning ring and consisting of the outer valve gap that fixing bolt is fixed on valve gap pilot hole outer end, interior valve gap is connected by the second turnbuckle with outer valve gap, the periphery of positioning ring is embedded on the locating slot in valve gap pilot hole, the end face that is pressed in hold-down ring interior week of positioning ring.
Described interior valve gap and hold-down ring are respectively with the conical surface and elastic seal ring butt.
On the outer circumferential face of described elastic seal ring, have elastic groove, the sealing surface of elastic seal ring has some double wedges.
Described positioning ring is segmental structure, is made up of at least two segmental arcs.
The bottom surface of described interior valve gap has the hollow protecting jacket with valve disc Corresponding matching, and protecting jacket is provided with multiple steam through holes.
On described outer valve gap, be connected with the second steam bleeder connection communicating with space in valve gap pilot hole.
Sealing cone on described valve rod is 45o conical surface, and on sealing cone, built-up welding has stellite.
On described stuffing box gland, there is the sealing cone that is matched with sealing cone on valve rod.
The present invention has following major advantage:
1. when valve is during in open mode, between stuffing box gland on valve rod and sleeve, form reliable and stable sealing by sealing cone, favorable sealing property, has reached the effect of zero leakage, make turbine efficiency have the income up to 12KJ/kwh, effectively reduce the operation cost of steam turbine;
2. valve gap adopts interior valve gap and the outer valve gap of split, internal valve cover is embedded in spacing the fixing of positioning ring on valve gap pilot hole, outer valve gap is fixed by fixing bolt, most pressure of steam are born by interior valve gap, in under the effect of vapor pressure, valve gap is realized self-locking, fixing reliable, outer valve gap only bears small vapor pressure, this greatly reduces the structural strength requirement of external valve gap fixing bolt, avoid upgrading and the expansion of specification to fixing bolt material, effectively reduce the design of outer valve gap fixing bolt, difficulty of processing, can not destroy valve body simultaneously yet, the structural stress of valve gap, reduce the design of valve entirety, difficulty of processing, extend the working life of valve, improve manufacture efficiency, reduce enterprise's manufacture cost,
3. the sealing effect of the elastic seal ring of composition valve gap is directly proportional to the vapor pressure that interior valve gap affords, that is to say that the vapor pressure that interior valve gap affords is larger, the amount of deformation of elastic seal ring is larger, and sealing effect is also just better, has effectively avoided steam to leak from valve gap; In addition, the sealing configuration of elastic seal ring (comprising self structure and the cooperating structure with other parts) design has further promoted sealing effect;
4. the positioning ring of composition valve gap designs with segmental structure, greatly facilitates the combination assembling of valve gap on valve body; In the time that elastic seal ring contingency runs into seal failure, leakage enters the steam in space in valve gap pilot hole and introduces gland steam heater by the second steam bleeder connection on outer valve gap, further reduce the vapor pressure that outer valve gap affords, guarantee the constant intensity of outer valve gap on valve body, improve the Security of valve operation;
5. the present invention is except being applicable to common steam-turbine unit use, and ultra supercritical unit or the double reheat unit that can also be applicable to high parameter steam use, and have equally good sealing and reliability, practical.
Brief description of the drawings
Below in conjunction with accompanying drawing, the present invention is further illustrated.
Fig. 1 is the structural representation of traditional Steam Turbine's Main Vaper Valve door.
Fig. 2 is a kind of structural representation of the present invention.
Fig. 3 is the local A enlarged view in Fig. 2.
Code name implication in Fig. 1: 01-valve rod; 02-sleeve; 03-gland sleeve; 04-pressing plate; 05-fixing bolt; The 06-the first steam bleeder connection; The 07-the second steam bleeder connection; 08-valve body; 09-valve disc; 010-valve gap; 011-clamping bolt; 012-upstream stream passageway; 013-downstream stream passageway; 014-valve seat; 015-limited step; 016-turnbuckle.
Code name implication in Fig. 2 and Fig. 3: 1-valve rod; 2-sleeve; 3-pressing plate; The 4-the first turnbuckle; 5-valve body; 6-limited step; 7-interior valve gap; 8-elastic seal ring; 9-hold-down ring; 10-positioning ring; 11-gasket seal; 12-outer valve gap; The 13-the second turnbuckle; 14-fixing bolt; 15-sealing cone; 16-protecting jacket; 17-steam through hole; 18-valve disc; 19-valve seat; 20-strainer body; 21-steam (vapor) outlet hole; 22-equalizing valve dish; 23-upstream stream passageway; 24-downstream stream passageway; The 25-the first steam bleeder connection; 26-annular space; The 27-the second steam bleeder connection; 28-stuffing box gland.
Embodiment
Referring to Fig. 2 and Fig. 3: the present invention includes valve body 5, valve gap and valve rod 1.
Wherein, valve body 5 is hollow structure, and valve body 5 has internal surface and outer surface.On valve body 5, be provided with upstream stream passageway 23, downstream stream passageway 24, valve rod pilot hole and valve gap pilot hole, upstream stream passageway 23 and the 24 radial misalignments settings of downstream stream passageway, valve body 5 internal surfaces between upstream stream passageway 23 and downstream stream passageway 24 are fixed with valve seat 19.Valve gap pilot hole is located at the top of valve body 5.Valve rod pilot hole is located at the bottom of valve body 5, the inner of valve rod pilot hole is provided with limited step 6, has stretched into sleeve 2 in valve rod pilot hole, and the periphery of sleeve 2 is located on the limited step 6 of valve rod pilot hole the inner, between limited step 6 and sleeve 2, be provided with grooved metal gasket, to improve its sealing; The bottom of sleeve 2 extends to the outer end place of valve rod pilot hole, the bottom of sleeve 2 is fixed with pressing plate 3 by the first turnbuckle 4, pressing plate 3 is located by the outer end of valve rod pilot hole, so far, valve rod pilot hole assembles sleeve 2 by limited step 6 and pressing plate 3, in order to improve the steadiness of pressing plate 3, pressing plate 3 can be fixed on valve body 5 by fixing bolt.On pressing plate 3 and sleeve 2, be respectively equipped with the pilot hole that valve rod 1 is led, the pilot hole on the pilot hole on pressing plate 3 and sleeve 2 should arrange with coaxial line, and the inner place of pilot hole of sleeve 2 is provided with stuffing box gland 28.
Valve gap is mainly by being assemblied in successively from top to bottom interior valve gap 7 in valve gap pilot hole, elastic seal ring 8, hold-down ring 9, positioning ring 10 and consisting of the outer valve gap 12 that fixing bolt 14 is fixed on valve gap pilot hole outer end, and the external diameter of interior valve gap 7, elastic seal ring 8 and hold-down ring 9 should match with the internal diameter of valve gap pilot hole.Interior valve gap 7 is connected by the second turnbuckle 13 with outer valve gap 12; the bottom surface of interior valve gap 7 has the hollow protecting jacket 16 with valve disc 18 Corresponding matchings; protecting jacket 16 is provided with multiple steam through holes 17, between the bottom surface of interior valve gap 7 and valve seat 19, is provided with strainer body 20, to prevent that foreign matter from entering in steam turbine.Elastic seal ring 8 selects soft state high temperature material to be made, for example 06Cr19Ni10; In elastic seal ring 8 contacts, the sealing surface of valve gap 7 and hold-down ring 9 is respectively the conical surface, the cross section of elastic seal ring 8 is triangular in shape, on the outer circumferential face of elastic seal ring 8, have elastic groove, to improve the amount of deformation of elastic seal ring 8, the sealing surface (being mainly the face of valve gap 7, hold-down ring 9 and valve gap pilot hole inwall in contact) of elastic seal ring 8 has some double wedges, these double wedges are conical tooth, and gradient is about 45o.Positioning ring 10 is segmental structure, be made up of four segmental arcs, the periphery of positioning ring 10 is embedded on the locating slot in valve gap pilot hole, the end face that is pressed in hold-down ring 9 interior week of positioning ring 10, the intensity of positioning ring 10 meets the demands by adjusting its thickness, and design difficulty is little.On outer valve gap 12, be connected with the second steam bleeder connection 27 communicating with space in valve gap pilot hole, this second steam bleeder connection 27 is connected with gland steam heater, with this, steam that leaks to space in valve gap pilot hole is drawn, and reduces the vapor pressure that outer valve gap 12 bears.
The upper end of valve rod 1 is connected valve disc 18 through pressing plate 3 with the pilot hole on sleeve 2, and the upper lid of valve disc 18 is in the protecting jacket 16 of interior valve gap 7.The top of valve disc 18 is connected with equalizing valve dish 22, steam (vapor) outlet hole on equalizing valve dish 22 communicates with the steam (vapor) outlet hole 21 on valve disc 18, can effectively improve the flow velocity of steam by the steam (vapor) outlet hole on valve disc 18 and equalizing valve dish 22, thus the balance of steam in balance upstream stream passageway 23 and downstream stream passageway 24.The lower end of valve rod 1 is connected with oil engine, driving lower valve rod 1 at oil engine moves, under the action of valve rod 1, the valve seat 19 on valve disc 18 and valve body 5 is realized cooperation closed or that open, thereby the upstream stream passageway 23 on valve body 5 and downstream stream passageway 24 are cut off or got through.For the freedom that ensures that valve rod 1 moves, between valve rod 1 and sleeve 2, must keep the gap of wide approximately 0.20～0.35mm, this gap makes to form between valve rod 1 and sleeve 2 annular space 26, valve rod 1 in annular space 26 is positioned near the inner place of sleeve 2 pilot holes and is provided with sealing cone 15, the sealing conical surface 15 is 45o conical surface, on sealing cone 15, built-up welding has stellite, to increase the wear resistance of sealing cone 15; On the stuffing box gland 28 of sleeve 2, be also provided with sealing cone, the sealing cone on stuffing box gland 28 should with valve rod 1 on sealing cone 15 suitable; In the time that valve disc 18 and valve seat 19 are opened, valve rod 1 is realized sealing by sealing cone 15 and stuffing box gland 28, and does spacing by sealing cone 15 to the aperture of valve disc 18 and valve seat 19.When valve disc 18 is on valve seat 19 when standard-sized sheet, valve rod 1 normally contacts sealing with the sealing cone on stuffing box gland 28, the leakage rate of steam in annular space 26 is zero, when valve disc 18 is on valve seat 19 not when standard-sized sheet, valve rod 1 can not normally contact sealing with the sealing cone on stuffing box gland 28, steam has certain leakage rate in annular space 26, in order to reduce leakage, on the valve rod 1 in annular space 26, is set with lining; Simultaneously, leak and enter machine room from annular space 26 for fear of steam, on valve body 5, be provided with the first steam bleeder connection 25 communicating with annular space 26, this steam bleeder connection is connected on gland steam heater, and the first steam bleeder connection 25 is introduced in gland steam heater as steam leakage being entered in annular space 26.
Sealing cone 15 angles of above-mentioned valve rod 1 can also be other angles except selecting 45o, if select other angle, the difficulty of processing of valve rod 1 and sleeve 2 has certain increase.
Above-mentioned stuffing box gland 28 also can, without sealing cone is set, can reach equally sealing effect, but sealing effect be poor.
The number of fragments of above-mentioned positioning ring 10 is not particular value, except selecting four segmental arcs, can be other quantity, and for example three segmental arcs, five segmental arcs, six segmental arcs etc. are mainly to consider from the angle of ease of assembly.
Claims (6)
1. a Steam Turbine's Main Vaper Valve door, comprising:
-valve body (5), described valve body (5) is provided with upstream stream passageway (23), downstream stream passageway (24), valve rod pilot hole and valve gap pilot hole, on valve body (5) between upstream stream passageway (23) and downstream stream passageway (24), be fixed with valve seat (19), on valve rod pilot hole, be equipped with sleeve (2) by limited step (6) and pressing plate (3), on pressing plate (3) and sleeve (2), be respectively equipped with the pilot hole that valve rod (1) is led;
-valve rod (1), the upper end of described valve rod (1) is connected valve disc (18) through pressing plate (3) with the pilot hole on sleeve (2), between valve rod (1) and sleeve (2), there is annular space (26), this annular space (26) communicates with the first steam bleeder connection (25) being connected on valve body (5), under the action of valve rod (1), valve seat (19) on valve disc (18) and valve body (5) coordinates, and the upstream stream passageway (23) on valve body (5) and downstream stream passageway (24) are cut off or got through; The inner place of pilot hole of described sleeve (2) is provided with stuffing box gland (28), described valve rod (1) is provided with sealing cone (15) near the inner place of sleeve (2) pilot hole, in the time that valve disc (18) and valve seat (19) are opened, valve rod (1) is realized sealing by sealing cone (15) and the stuffing box gland (28) on sleeve (2), and does spacing by sealing cone (15) to the aperture of valve disc (18) and valve seat (19);
-valve gap, described valve bonnet seal is assemblied on the valve gap pilot hole of valve body (5), it is characterized in that, described valve gap is mainly by the interior valve gap (7) being assemblied in successively from top to bottom in valve gap pilot hole, elastic seal ring (8), hold-down ring (9), positioning ring (10) and by fixing bolt (14) be fixed on valve gap pilot hole outer end outer valve gap (12) form, interior valve gap (7) is connected by the second turnbuckle (13) with outer valve gap (12), elastic seal ring (8) is respectively with the conical surface and interior valve gap (7) and hold-down ring (9) formation butt, on the outer circumferential face of elastic seal ring (8), have elastic groove, the sealing surface of elastic seal ring (8) has some double wedges, the periphery of positioning ring (10) is embedded on the locating slot in valve gap pilot hole, the end face that is pressed in hold-down ring (9) interior week of positioning ring (10).
2. Steam Turbine's Main Vaper Valve door according to claim 1, is characterized in that, described positioning ring (10) is segmental structure, is made up of at least two segmental arcs.
3. Steam Turbine's Main Vaper Valve door according to claim 1, is characterized in that, the bottom surface of described interior valve gap (7) has the hollow protecting jacket (16) with valve disc (18) Corresponding matching, and protecting jacket (16) is provided with multiple steam through holes (17).
4. Steam Turbine's Main Vaper Valve door according to claim 1, is characterized in that, is connected with the second steam bleeder connection (27) communicating with space in valve gap pilot hole on described outer valve gap (12).
5. Steam Turbine's Main Vaper Valve door according to claim 1, is characterized in that, the sealing cone (15) on described valve rod (1) is 45o conical surface, and the upper built-up welding of sealing cone (15) has stellite.
6. Steam Turbine's Main Vaper Valve door according to claim 1, is characterized in that, has the sealing cone that is matched with the upper sealing cone (15) of valve rod (1) on described stuffing box gland (28).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210235740.4A CN102787871B (en) | 2012-07-10 | 2012-07-10 | Main steam valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210235740.4A CN102787871B (en) | 2012-07-10 | 2012-07-10 | Main steam valve of steam turbine |
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| Publication Number | Publication Date |
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| CN102787871A CN102787871A (en) | 2012-11-21 |
| CN102787871B true CN102787871B (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210235740.4A Active CN102787871B (en) | 2012-07-10 | 2012-07-10 | Main steam valve of steam turbine |
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| CN106958466B (en) * | 2017-05-18 | 2018-07-17 | 山东青能动力股份有限公司 | Multistage steam flow-rate adjustment speed shutting mechanism and steam turbine |
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| CN110193681A (en) * | 2018-02-27 | 2019-09-03 | 上海电气电站设备有限公司 | A kind of steam turbine valve is interior to seal overlay cladding and its structure |
| CN108799620B (en) * | 2018-06-29 | 2019-07-19 | 东方电气集团东方汽轮机有限公司 | A kind of valve casing cooling system |
| CN108799536B (en) * | 2018-08-16 | 2024-06-04 | 中国船舶重工集团公司第七0四研究所 | Main valve stem structure |
| CN117988937B (en) * | 2024-03-08 | 2024-09-10 | 江西大唐国际新余第二发电有限责任公司 | Main valve of steam turbine |
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| GB783101A (en) * | 1954-11-12 | 1957-09-18 | British Thomson Houston Co Ltd | Improvements relating to steam valves |
| US4114652A (en) * | 1975-04-30 | 1978-09-19 | Bbc Brown Boveri & Company Limited | Combined stop and control valve |
| GB2247736A (en) * | 1990-07-25 | 1992-03-11 | Gec Alsthom Ltd | Steam turbine control valve |
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| JPH11343811A (en) * | 1998-06-03 | 1999-12-14 | Toshiba Corp | Steam turbine plant, main steam stop valve and reheat steam stop valve |
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| CN200949478Y (en) * | 2006-08-04 | 2007-09-19 | 上海汽轮机有限公司 | Double layer valve cap of steam turbine main steam intake valve |
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB783101A (en) * | 1954-11-12 | 1957-09-18 | British Thomson Houston Co Ltd | Improvements relating to steam valves |
| US4114652A (en) * | 1975-04-30 | 1978-09-19 | Bbc Brown Boveri & Company Limited | Combined stop and control valve |
| GB2247736A (en) * | 1990-07-25 | 1992-03-11 | Gec Alsthom Ltd | Steam turbine control valve |
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| JPH11343811A (en) * | 1998-06-03 | 1999-12-14 | Toshiba Corp | Steam turbine plant, main steam stop valve and reheat steam stop valve |
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| CN102787871A (en) | 2012-11-21 |
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