CN114183207B - Valve core assembly and unloading adjusting valve - Google Patents
Valve core assembly and unloading adjusting valve Download PDFInfo
- Publication number
- CN114183207B CN114183207B CN202111289045.1A CN202111289045A CN114183207B CN 114183207 B CN114183207 B CN 114183207B CN 202111289045 A CN202111289045 A CN 202111289045A CN 114183207 B CN114183207 B CN 114183207B
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- valve
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- unloading
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- disc
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- 238000007789 sealing Methods 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Lift Valve (AREA)
Abstract
The application relates to a valve core assembly and an unloading adjusting valve, wherein the valve core assembly comprises a valve seat, a guide sleeve and a valve core; the upper end of the valve seat is provided with an opening, the guide sleeve is arranged above the valve seat, a vertically-arranged step hole is formed in the guide sleeve, the step hole sequentially comprises an adjusting section and a guide section which are coaxially communicated from bottom to top, a step surface is formed between the adjusting section and the guide section, and the inner diameter of the adjusting section is larger than that of the guide section; the valve core comprises a valve rod, a valve rod sleeve and a valve disc, and the valve is stable in operation and high in switching speed by adopting a mode of unloading partial pressure in advance.
Description
Technical Field
The application relates to the technical field of steam turbines, in particular to a valve core assembly and an unloading adjusting valve.
Background
In the high-temperature and high-pressure steam turbines currently produced by various steam turbine plants in China, the unloading proportion of the matched regulating valve is constant, so that in order to reduce the lifting force of the regulating valve when just opened, the unloading proportion is usually larger, and 100% unloading is adopted for part of the regulating valves. The problem is that when the opening of the valve is large, the valve is in an unstable state due to the small pressure difference between the front and the back of the valve, so that the valve disc often fluctuates up and down (or rotates).
Disclosure of Invention
Based on the expression, the application provides a valve core assembly to solve the technical problem that the valve disc is fluctuated due to the fact that the unloading proportion is constant and the valve opening is large in the prior art.
The technical scheme for solving the technical problems is as follows:
a valve core assembly comprises a valve seat, a guide sleeve and a valve core;
the upper end of the valve seat is provided with an opening, the guide sleeve is arranged above the valve seat, a vertically-arranged step hole is formed in the guide sleeve, the step hole sequentially comprises an adjusting section and a guide section which are coaxially communicated from bottom to top, a step surface is formed between the adjusting section and the guide section, and the inner diameter of the adjusting section is larger than that of the guide section;
the valve core comprises a valve rod, a valve rod sleeve and a valve disc, wherein the valve rod comprises a rod body and a pre-opening valve, the rod body is slidably arranged on the guide section and is in sealing connection with the guide section, the pre-opening valve is fixedly connected to the lower end of the rod body, the valve rod sleeve is slidably arranged outside the rod body and is positioned above the pre-opening valve, and a first unloading cavity is formed between the upper end of the valve rod sleeve and the step surface; the size of the upper end of the pre-opening valve is larger than that of the lower end opening of the valve rod sleeve; the valve disc is fixedly connected to the lower end of the valve rod sleeve, the valve disc is of a cylindrical structure with upper and lower openings, a first sealing part used for being matched and sealed with the lower end of the pre-opening valve is formed on the inner wall of the valve disc, a second unloading cavity is formed between the first sealing part and the valve rod sleeve, the height of the second unloading cavity is larger than that of the pre-opening valve, a second sealing part used for being matched and sealed with the valve seat is arranged at the lower end of the valve disc, a first balance hole used for being communicated with the first unloading cavity and the second unloading cavity is formed on the valve rod sleeve, and a second balance hole used for being communicated with the second unloading cavity and the outer portion of the valve disc is formed on the side wall of the valve disc.
Compared with the prior art, the technical scheme of the application has the following beneficial technical effects:
when the valve is closed, the second sealing part is in sealing fit with the valve seat, the first sealing part is in sealing fit with the lower end of the pre-opening valve, the second unloading cavity is not communicated with the space at the lower end of the pre-opening valve, at the moment, high-pressure gas is filled in the first unloading cavity and the second unloading cavity, the valve core is tightly pressed on the valve seat, when the valve core needs to be opened, the valve rod is required to be lifted, the size of the pre-opening valve is far smaller than the size of the valve disc, the pre-opening valve can be opened only by overcoming the smaller load, after the pre-opening valve is opened, the second unloading cavity is communicated with the space at the lower end of the pre-opening valve, so that the pressure in the first unloading cavity and the second unloading cavity is rapidly reduced, and when the pre-opening valve is opened to a full stroke, the pre-opening valve drives the valve disc to move upwards together, and the valve disc is subjected to a stable load when being lifted, and the valve disc is lifted more rapidly and stably, so that the valve is opened; the application adopts a mode of unloading partial pressure in advance, the valve is stable in operation and high in switching speed.
On the basis of the technical scheme, the application can be improved as follows.
Further, a third balance hole is formed in the side wall of the adjusting section, a conduction gap is formed between the outer side wall of the valve disc and the inner wall of the adjusting section, and two ends of the second balance hole are communicated with the conduction gap and the second unloading cavity.
Further, the area of the lower end face of the first unloading cavity is larger than the area of the upper end face of the second unloading cavity.
Further, the valve rod sleeve comprises a cylinder body and an annular flange which is positioned at the upper end of the cylinder body and extends along the direction far away from the axis of the cylinder body, the upper end face of the annular flange forms the lower end face of the first unloading cavity, and the lower end face of the cylinder body forms the upper end face of the second unloading cavity.
Further, the upper end of the valve disc is sleeved outside the cylinder and connected with the lower end of the annular flange, and the lower end face of the cylinder is opposite to the upper end face of the first sealing part.
Further, the upper end of the valve disc is connected to the annular flange by a fastening screw.
Further, still include the cartridge filter, the upper end cover of cartridge filter is located the guide sleeve outside, the lower extreme of cartridge filter with the disk seat is connected.
The application also provides an unloading regulating valve which comprises a valve shell and the valve core assembly, wherein the valve shell comprises a shell and a cover body, the cover body is fixedly connected to the upper end of the shell, the valve seat is arranged at the lower end of the interior of the shell, the upper end of the guide sleeve extends out of the shell, the lower end of the shell is provided with an exhaust port communicated with the valve seat, and the side wall of the shell is provided with an air inlet, and when the valve seat and the second sealing part are matched and sealed, the air inlet and the exhaust port are separated.
Drawings
Fig. 1 is a schematic structural diagram of an unloading adjusting valve in an open state according to an embodiment of the present application;
FIG. 2 is a schematic view of the structure of FIG. 1 in the closed state;
FIG. 3 is a schematic diagram of the new component of FIG. 2;
fig. 4 is an enlarged partial schematic view of region C in fig. 3.
Detailed Description
In order that the application may be readily understood, a more complete description of the application will be rendered by reference to the appended drawings. Embodiments of the application are illustrated in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that spatially relative terms, such as "under", "below", "beneath", "under", "above", "over" and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below" and "under" may include both an upper and a lower orientation. Furthermore, the device may also include an additional orientation (e.g., rotated 90 degrees or other orientations) and the spatial descriptors used herein interpreted accordingly.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. In the following embodiments, "connected" is understood to mean "electrically connected", "communicatively connected", and the like, if the connected circuits, modules, units, and the like have electrical or data transferred therebetween.
As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," and/or the like, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.
As shown in fig. 1-4, an embodiment of the present application discloses an unloading adjustable valve comprising a valve housing 10 and a valve core assembly 20.
The valve housing 10 includes a housing 11 and a cover 12, wherein the cover 12 is fastened to the upper end of the housing 11, and specifically, the cover 12 is connected to the upper end of the housing 11 through a plurality of fastening bolts.
The valve core assembly 20 comprises a valve seat 21, a guide sleeve 22 and a valve core 23, wherein the valve seat 21 is mounted at the lower end inside the shell 11, the upper end of the valve seat 21 is opened, the valve seat 21 can be fixed at the lower part of the shell 11 in a welding or threaded fixing mode, the upper end of the guide sleeve 22 extends out of the shell 11, the lower end of the shell 11 is provided with an exhaust port 11a communicated with the valve seat 21, and the side wall of the shell 11 is provided with an air inlet (not shown in the figure).
Wherein the inlet is used for high-pressure gas to enter and keep the valve tightly closed, the outlet is used for gas outflow in the shell 11 to release pressure, it is understood that the inlet and outlet of the inlet are respectively regulated by separate control valves, and if the valve is closed, the gas entering from the inlet can directly flow out from the outlet, and when the valve is closed, the inlet and the outlet are blocked.
The guide sleeve 22 is internally provided with a vertically-arranged step hole 22a, the step hole 22a sequentially comprises an adjusting section a1 and a guide section a2 which are coaxially communicated from bottom to top, a step surface 221 is formed between the adjusting section a1 and the guide section a2, and the inner diameter of the adjusting section a1 is larger than that of the guide section a 2.
The valve spool 23 includes a valve stem 231, a valve stem sleeve 232, and a valve disc 233.
The valve rod 231 includes a rod body 2311 and a pre-opening valve 2312, the rod body 2311 is slidably mounted on the guiding section a2 and is in sealing connection with the guiding section a2, the pre-opening valve 2312 is fixedly connected to the lower end of the rod body 2311, and preferably, the rod body 2311 and the pre-opening valve 2312 are integrally formed.
The valve rod sleeve 232 is slidably mounted outside the rod body 2311 and above the pre-opening valve 2312, and a first unloading cavity x1 is formed between the upper end of the valve rod sleeve 232 and the step surface 221; the size of the upper end of the pre-opening valve 2312 is larger than the size of the lower opening of the valve stem sleeve 232.
The valve disc 233 is fixedly connected to the lower end of the valve stem sleeve 232, the valve disc 233 is of a cylindrical structure with an upper opening and a lower opening, a first sealing portion 2331 for sealing with the lower end of the pre-opening valve 2312 is formed on the inner wall of the valve disc 233, a second unloading cavity x2 is formed between the first sealing portion 2331 and the valve stem sleeve 232, the height of the second unloading cavity x2 is larger than that of the pre-opening valve 2312, a second sealing portion 2332 for sealing with the valve seat 21 is formed at the lower end of the valve disc 233, a first balance hole 232a for communicating the first unloading cavity x1 with the second unloading cavity x2 is formed on the valve stem sleeve 232, and a second balance hole 233a for communicating the second unloading cavity x2 with the outside of the valve disc 233 is formed on the side wall of the valve disc 233.
As is apparent from the above description, when the valve is closed, the second seal portion 2332 is in sealing engagement with the valve seat 21, the first seal portion 2331 is in sealing engagement with the lower end of the pre-opening valve 2312, at this time, the second unloading chamber x2 is not in communication with the space at the lower end of the pre-opening valve 2312, the air inlet and the air outlet are blocked, the high-pressure air introduced from the air inlet is filled into the first unloading chamber x1 and the second unloading chamber x2, and the valve spool 23 is tightly pressed against the valve seat 21.
When the valve core 23 needs to be opened, the valve rod 231 is required to be lifted, because the size of the pre-opening valve 2312 is far smaller than that of the valve disc 233, the force required for lifting the pre-opening valve 2312 is small, and only a small load needs to be overcome to open the pre-opening valve 2312, after the pre-opening valve 2312 is opened, the second unloading cavity x2 is communicated with the space (named as a third unloading cavity x3 for convenience of description) at the lower end of the pre-opening valve 2312, so that the internal pressure of the first unloading cavity x1 and the internal pressure of the second unloading cavity x2 are rapidly reduced, and when the pre-opening valve 2312 is opened to a full stroke, the pre-opening valve 2312 drives the valve disc 233 to move upwards together, and because the internal pressure and the external pressure of the valve disc 233 are constant, the valve disc 233 is subjected to a stable load when lifted, and the valve disc 233 is lifted more quickly and stably, so that the valve is opened.
Preferably, a third balance hole 22b is formed on the side wall of the adjusting section a1, a conduction gap d is formed between the outer side wall of the valve disc 233 and the inner wall of the adjusting section a1, and two ends of the second balance hole 233a are communicated with the conduction gap d and the second unloading cavity x2.
The third balance hole 22b can always keep the gas pressure of the outer side wall of the guide sleeve 22 consistent with the gas pressure of the first unloading cavity x1 and the second unloading cavity x2, specifically, when the valve is closed, the gas entering from the gas inlet is firstly located outside the guide sleeve 22, and due to the existence of the third balance hole 22b, the high-pressure gas flows into the conducting gap d from the third balance hole 22b, then flows into the second unloading cavity x2 through the second balance hole 233a, and finally enters the first unloading cavity x1 through the first balance hole 232a, so that the balance of the gas pressure is realized.
In a preferred embodiment of the present application, the area of the lower end surface of the first unloading chamber x1 is larger than the area of the upper end surface of the second unloading chamber x2.
According to the relationship between the gas pressure and the pressure, f=p×s, where F is the pressure, P is the gas pressure, and S is the force-bearing area, it is known that when the gas pressure is constant, the pressure of the gas on the object is proportional to the force-bearing area, because the area of the lower end surface of the first unloading chamber x1 is larger than the area of the upper end surface of the second unloading chamber x2, the downward pressure of the first unloading chamber x1 on the valve core 23 can be ensured to be larger than the jacking force of the gas in the second unloading chamber x2 on the valve core, so as to ensure that the valve rod 231 is subjected to downward load, and is firmly pressed on the valve seat 21.
In this embodiment, the specific implementation manner that the area of the lower end surface of the first unloading cavity x1 is larger than that of the upper end surface of the second unloading cavity x2 is as follows: the valve stem sleeve 232 includes a cylinder 2321 and an annular flange 2322 located at an upper end of the cylinder 2321 and extending along a direction away from an axis of the cylinder 2321, an upper end face of the annular flange 2322 forms a lower end face of the first unloading chamber x1, and a lower end face of the cylinder 2321 forms an upper end face of the second unloading chamber x2.
In order to ensure that the valve disc 233 stably lifts along with the valve rod sleeve 232, the upper end of the valve disc 233 is sleeved on the outer side of the cylinder 2321 and is connected with the lower end of the annular flange 2322, and the lower end face of the cylinder 2321 is opposite to the upper end face of the first sealing portion 2331.
More preferably, the upper end of the valve disc 233 is connected to the annular flange 2322 by a fastening screw.
In the embodiment of the present application, in order to ensure that the valve core assembly 20 is prevented from being damaged by impurities in the high-pressure gas, and the service life of the valve core assembly 20 is reduced, the valve core assembly 20 further comprises a filter cartridge 24, the upper end of the filter cartridge 24 is sleeved outside the guide sleeve 232, and the lower end of the filter cartridge 24 is connected with the valve seat 21.
When the valve is closed, the gas entering from the gas inlet is firstly positioned outside the guide sleeve 22, high-pressure gas flows into the conducting gap d from the third balance hole 22b due to the existence of the third balance hole 22b, then flows into the second unloading cavity x2 through the second balance hole 233a, finally enters the first unloading cavity x1 through the first balance hole 232a, and the valve rod 231 is stressed downwards and stably pressed on the valve seat 21 due to the fact that the lower end surface area of the first unloading cavity x1 is larger than the upper end surface area of the second unloading cavity x2.
When the pre-opening valve 2312 is opened, because the diameter of the pre-opening valve 2312 is much smaller than that of the valve disc 233, the required lifting force is smaller, and only 10% -30% of the load is overcome to open the pre-opening valve, the air flow formed by the high-pressure gas enters the second unloading cavity x2 through the first balance hole 232a to finish the larger unloading of the valve rod 231, and the air flow of the second unloading cavity x2 flows into the third unloading cavity x3 along with the opening of the pre-opening valve, so that the load borne by the valve disc 233 is reduced, and the valve disc 233 maintains a stable load to prevent the fluctuation.
The foregoing description of the preferred embodiments of the application is not intended to limit the application to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the application are intended to be included within the scope of the application.
Claims (6)
1. The valve core assembly is characterized by comprising a valve seat, a guide sleeve and a valve core;
the upper end of the valve seat is provided with an opening, the guide sleeve is arranged above the valve seat, a vertically-arranged step hole is formed in the guide sleeve, the step hole sequentially comprises an adjusting section and a guide section which are coaxially communicated from bottom to top, a step surface is formed between the adjusting section and the guide section, and the inner diameter of the adjusting section is larger than that of the guide section;
the valve core comprises a valve rod, a valve rod sleeve and a valve disc, wherein the valve rod comprises a rod body and a pre-opening valve, the rod body is slidably arranged on the guide section and is in sealing connection with the guide section, the pre-opening valve is fixedly connected to the lower end of the rod body, the valve rod sleeve is slidably arranged outside the rod body and is positioned above the pre-opening valve, and a first unloading cavity is formed between the upper end of the valve rod sleeve and the step surface; the size of the upper end of the pre-opening valve is larger than that of the lower end opening of the valve rod sleeve; the valve disc is fixedly connected to the lower end of the valve rod sleeve, the valve disc is of a cylindrical structure with an upper opening and a lower opening, a first sealing part used for being matched and sealed with the lower end of the pre-opening valve is formed on the inner wall of the valve disc, a second unloading cavity is formed between the first sealing part and the valve rod sleeve, the height of the second unloading cavity is larger than that of the pre-opening valve, a second sealing part used for being matched and sealed with the valve seat is formed at the lower end of the valve disc, a first balance hole used for being communicated with the first unloading cavity and the second unloading cavity is formed on the valve rod sleeve, and a second balance hole used for being communicated with the second unloading cavity and the outer part of the valve disc is formed on the side wall of the valve disc;
a conduction gap is formed between the outer side wall of the valve disc and the inner wall of the adjusting section, and two ends of the second balance hole are communicated with the conduction gap and the second unloading cavity;
the area of the lower end face of the first unloading cavity is larger than that of the upper end face of the second unloading cavity.
2. The valve cartridge assembly of claim 1, wherein the valve stem sleeve comprises a barrel and an annular flange located at an upper end of the barrel and extending in a direction away from the barrel axis, an upper end face of the annular flange constituting a lower end face of the first unloading chamber, and a lower end face of the barrel constituting an upper end face of the second unloading chamber.
3. The valve cartridge assembly according to claim 2, wherein an upper end of the valve disc is sleeved outside the cylinder and connected to a lower end of the annular flange, and a lower end surface of the cylinder is disposed opposite to an upper end surface of the first sealing portion.
4. The valve cartridge assembly of claim 3, wherein an upper end of the valve disc is connected to the annular flange by a set screw.
5. The valve cartridge assembly of claim 1, further comprising a filter cartridge, an upper end of the filter cartridge being nested outside the guide sleeve, a lower end of the filter cartridge being connected to the valve seat.
6. An unloading regulating valve, comprising a valve housing and a valve core assembly according to any one of claims 1-5, wherein the valve housing comprises a housing and a cover body, the cover body is fixedly connected to the upper end of the housing, the valve seat is mounted at the lower end inside the housing, the upper end of the guide sleeve extends out of the housing, the lower end of the housing is provided with an exhaust port communicated with the valve seat, and the side wall of the housing is provided with an air inlet, and when the valve seat and the second sealing part are matched and sealed, the air inlet and the exhaust port are separated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111289045.1A CN114183207B (en) | 2021-11-02 | 2021-11-02 | Valve core assembly and unloading adjusting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111289045.1A CN114183207B (en) | 2021-11-02 | 2021-11-02 | Valve core assembly and unloading adjusting valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114183207A CN114183207A (en) | 2022-03-15 |
| CN114183207B true CN114183207B (en) | 2023-11-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111289045.1A Active CN114183207B (en) | 2021-11-02 | 2021-11-02 | Valve core assembly and unloading adjusting valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN114183207B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232849A (en) * | 1967-07-21 | 1971-05-19 | ||
| JP2009052471A (en) * | 2007-08-27 | 2009-03-12 | Toshiba Corp | Steam valve |
| CN102486097A (en) * | 2010-12-03 | 2012-06-06 | 北京全三维动力工程有限公司 | High-pressure regulating valve and method for regulating high-pressure fluid |
| CN104405901A (en) * | 2014-11-18 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Regulating valve of large generator set |
| CN206522458U (en) * | 2017-02-27 | 2017-09-26 | 广州协鑫蓝天燃气热电有限公司 | A kind of high pressure steam control valve core |
| CN110242367A (en) * | 2019-07-17 | 2019-09-17 | 杭州汽轮机股份有限公司 | Steam extraction and condensing formula industrial steam turbine |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102853128B (en) * | 2011-06-27 | 2014-05-14 | 浙江三花股份有限公司 | Flow control valve |
| EP3098494B1 (en) * | 2014-01-20 | 2018-04-25 | Zhejiang Sanhua Climate & Appliance Controls Group Co., Ltd. | Direct-action-type electrically-operated valve and assembly method therefor |
-
2021
- 2021-11-02 CN CN202111289045.1A patent/CN114183207B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1232849A (en) * | 1967-07-21 | 1971-05-19 | ||
| JP2009052471A (en) * | 2007-08-27 | 2009-03-12 | Toshiba Corp | Steam valve |
| CN102486097A (en) * | 2010-12-03 | 2012-06-06 | 北京全三维动力工程有限公司 | High-pressure regulating valve and method for regulating high-pressure fluid |
| CN104405901A (en) * | 2014-11-18 | 2015-03-11 | 东方电气集团东方汽轮机有限公司 | Regulating valve of large generator set |
| CN206522458U (en) * | 2017-02-27 | 2017-09-26 | 广州协鑫蓝天燃气热电有限公司 | A kind of high pressure steam control valve core |
| CN110242367A (en) * | 2019-07-17 | 2019-09-17 | 杭州汽轮机股份有限公司 | Steam extraction and condensing formula industrial steam turbine |
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| Publication number | Publication date |
|---|---|
| CN114183207A (en) | 2022-03-15 |
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