CN103968149A - Axial-flow type maze throttling structure - Google Patents
Axial-flow type maze throttling structure Download PDFInfo
- Publication number
- CN103968149A CN103968149A CN201410162835.7A CN201410162835A CN103968149A CN 103968149 A CN103968149 A CN 103968149A CN 201410162835 A CN201410162835 A CN 201410162835A CN 103968149 A CN103968149 A CN 103968149A
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- Prior art keywords
- labyrinth
- maze
- inner core
- overcoat
- tabula
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Classifications
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/02—Means in valves for absorbing fluid energy for preventing water-hammer or noise
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- 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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K47/00—Means in valves for absorbing fluid energy
- F16K47/08—Means in valves for absorbing fluid energy for decreasing pressure or noise level and having a throttling member separate from the closure member, e.g. screens, slots, labyrinths
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses an axial-flow type maze throttling structure. The axial-flow type maze throttling structure is mainly and technically characterized in that a maze throttling assembly composed of a maze outer sleeve and a maze inner core is arranged in an outer side pressure-bearing body, the maze inner core is arranged in the center position, and the maze outer sleeve wraps the periphery of the maze inner core; a plurality of platy transverse partitions are arranged between the maze outer sleeve and the maze inner core, and a plurality of through holes are distributed in a bottom plate of the maze inner core; the transverse partitions on the maze outer sleeve and the transverse partitions on the maze inner core are sequentially arrayed in a staggered mode, a certain gap is kept between every two adjacent transverse partitions, certain gaps are kept between the inner diameters of transverse partitions on the maze outer sleeve and the outer diameter of the cylindrical face of the maze inner core, certain gaps are kept between the outer diameters of the transverse partitions on the maze inner core and the diameters of the cylindrical holes in the outer sleeve, and therefore a maze passageway which allows fluid to continuously turn by 90 degrees is formed; the maze outer sleeve is made of two same symmetrical half pieces. The axial-flow type maze throttling structure has the advantages that the good throttling and speed reduction effect, the good vibration and noise reduction effect, the good effect of preventing damage caused by washing and the good effect of reducing and eliminating damage caused by gas corrosion are achieved, the axial-flow type maze throttling structure can not be blocked by sundries when running, and the axial-flow type maze throttling structure is simple and compact in structure, small in occupied space, small in part number and low in manufacturing cost.
Description
Technical field
The present invention relates to a kind of valve and piping attachment structure, be specifically related to a kind of High Pressure Difference throttling reduction of speed structure.
Background technique
Along with scientific and technical development, in all kinds of process pipe systems, be faced with increasing High Pressure Difference operating mode, simultaneously along with the capacity of system and unit and the raising of parameter, the operating mode pressure reduction of supporting valve is also more and more higher.When valve moves under High Pressure Difference operating mode, because the flowing velocity of fluid is very high, thereby can brings more serious vibration, noise, wash away and even cavitation erosion, shorten the working life of valve, increase the operating cost of unit.
For High Pressure Difference operating mode, have at present multiplely for the throttling reduction of speed structure on valve, mainly comprise: porous sleeve or multistage porous sleeve throttling, multi-layer porous sleeve throttling, multi-layer porous disc throttling, Multi-stage plunger throttling, with 90 ° of Multi-stage plunger throttlings that turn to, the throttling of multilayer labyrinth disc etc.Except multilayer labyrinth disc throttle structure, all the other these throttle structures have following common shortcoming: 1, in the time that pressure reduction is higher, can accomplish easily tens of levels with respect to the labyrinth throttling progression of labyrinth disc throttle structure, rate of flow of fluid can drop to the flow velocity of tens of meters per second effectively, other throttle structure is difficult to accomplish really can realize the throttling progression of comparatively ideal reduction of speed effect, as: the progression of multistage its porous sleeve of cage porous sleeve step-down valve of certain leading company of Germany is accomplished at most 7～9 grades, the highest sleeve progression of the multi-layer porous sleeve of HUSH for High Pressure Difference operating mode is 7 grades, Multi-stage plunger throttling and multi-layer porous disc throttling are because the general throttling progression of restriction of space and structure is also difficult to more than ten level.Throttling progression is restricted, and is naturally also just difficult to realize comparatively ideal throttling reduction of speed, vibration and noise reducing and alleviates and eliminate the effect of washing away with cavitation erosion in the time that pressure reduction is higher; 2, throttle structure take up room or length excessive; 3, because the structural feature of different throttle structures is different, decline continuously to ging up without pressure with respect to labyrinth disc throttle structure pressure in throttling process, all the other various throttle structures all have the dilatation followed after every grade of throttling and the pressure that produces gos up, and easily cause producing cavitation and cavitation erosion breakoff phenomenon.
In the throttling process that labyrinth disc throttle structure is added due to throttling progression, pressure declines to ging up without pressure continuously, thereby in various throttle structures, be throttling reduction of speed, vibration and noise reducing, avoid erosion damage and alleviate and eliminate the best a kind of structure of effect of cavitation erosion, while use, have good effect on the adjusting class valve of various High Pressure Difference, if but labyrinth disc throttle structure is applied in when not regulating the High Pressure Difference of requirement to block on class valve and pipeline or being applied to some High Pressure Difference mainly regulating in larger opening and regulating on class valve, part comes with some shortcomings: 1, number of spare parts is many, complex structure, take up room larger, high cost, 2, because the cross section of fluid channel size of maze trough on labyrinth disc is less, when containing the solid-state and particulate matter such as impurity, dirty and welding slag solder joint, scale in medium, the high-pressure differential valve coming into operation after completing on some pipelines at initial stage as the High Pressure Difference blowdown valve for boiler blow-off and maintenance, if adopt the labyrinth disc structure reduction of speed that reduces pressure on these valves, maze trough is easy to blocked and valve cannot be used.
Summary of the invention
In order to overcome more existing throttle structures existing above-mentioned deficiency in use, the invention provides one has good throttling reduction of speed, vibration and noise reducing and alleviates and elimination is washed away and the execution that cavitates, can do not stopped up by impurity, simple in structure, tight Minato, number of spare parts is few, the High Pressure Difference throttle structure of low cost of manufacture.
To achieve these goals, the present invention is by the following technical solutions:
A kind of axial flow labyrinth throttle structure, comprises labyrinth overcoat, labyrinth inner core and outside pressure-bearing body.Its technological scheme and major technique key are: in two ends are respectively equipped with the outside pressure-bearing body of fluid input and fluid output, labyrinth orifice union is set, described labyrinth orifice union comprises labyrinth overcoat and two main members of labyrinth inner core; The revolution build part that centered by labyrinth overcoat and labyrinth inner core, line overlaps, the direction of the entrance and exit line of both centerline directions and outside pressure-bearing body is coincide, labyrinth inner core is at the middle position of labyrinth orifice union and labyrinth overcoat is enclosed in the periphery of labyrinth inner core, and the cavity in the middle of both is communicated with the runner that forms this throttle structure with the entrance and exit of outside pressure-bearing body; The basic shape of labyrinth overcoat is multistage cylindrical shape, Intermediate Gray multiple tabular, perpendicular to cylinder axis, the endoporus tabula concentric with cylinder, the basic shape of labyrinth inner core is the multistage cylindrical of one end band disc base plate, in the middle of cylinder also with multiple tabular, perpendicular to the tabula of cylinder axis, cylindrical and cylindrical-concentric, several through holes that distributing on the base plate of labyrinth inner core enter or flow out the passage of labyrinth orifice union as medium; Tabula on the tabula putting outside labyrinth and labyrinth inner core is staggered successively, be that adjacent two tabulas are respectively the tabula of labyrinth overcoat and the tabula of labyrinth inner core, between adjacent two tabulas, keep certain interval, and also all keep certain interval between the cylindrical hole diameter putting between cylndrical surface external diameter on the internal diameter of the tabula of labyrinth overcoat and labyrinth inner core and outside the external diameter of the tabula of labyrinth inner core and labyrinth; Said structure has jointly been formed and has been made continuously 90 ° of labyrinth shape passages that turn to therein can allow fluid flow time by the cylndrical surface of the cylindrical hole of labyrinth overcoat, labyrinth inner core and the tabula above both between labyrinth overcoat and labyrinth inner core.In addition, described multistage columnar labyrinth overcoat is by by the section plane of its center line---and labyrinth overcoat divides tangent plane that its point is cut to two identical and symmetrical two-part and is formed.
Described outside pressure-bearing body, can be made up of left and right two-part, and after labyrinth overcoat, labyrinth inner core pack into, outside pressure-bearing body combines, compresses, is welded as a whole; In addition, also can be by the built-in design of throttle structure of this axial flow labyrinth in valve, and outside pressure-bearing body using the valve body of valve as labyrinth throttle structure.
The invention has the beneficial effects as follows: there is good throttling reduction of speed, vibration and noise reducing, avoid erosion damage and alleviate and eliminate the effect of cavitation erosion, when operation, can not stopped up by impurity, simple in structure, tight Minato, takes up room little, number of spare parts is few, low cost of manufacture.
Brief description of the drawings
Fig. 1 is the schematic diagram of axial flow labyrinth throttle structure proposed by the invention.
Fig. 2 adopts the technological scheme of the axial flow labyrinth throttle structure of the present invention's proposition to be made into the schematic diagram of individual components and valve matched use.
Fig. 3 is by the built-in schematic diagram designing in valve of technological scheme of the axial flow labyrinth throttle structure of the present invention's proposition.
In figure, 1, labyrinth overcoat; 2, labyrinth inner core; 3, tabula; 4, base plate; 5, outside pressure-bearing body; 6, labyrinth overcoat divides tangent plane; 7, valve; 8, valve body.
Embodiment
Below in conjunction with drawings and Examples, technological scheme of the present invention is further elaborated.
Embodiment one
As shown in Figure 1, be the schematic diagram of one embodiment of the invention.Concrete technological scheme is: outside pressure-bearing body (5) is combined, is welded by two-part, and two ends are respectively equipped with fluid input and fluid output, in outside pressure-bearing body (5), be provided with labyrinth orifice union, labyrinth orifice union is made up of labyrinth overcoat (1) and (2) two members of labyrinth inner core, the revolution build part that centered by labyrinth overcoat (1) and labyrinth inner core (2), line overlaps, the entrance and exit line of both center lines and outside pressure-bearing body (5) coincides, labyrinth inner core (2) is at the middle position of labyrinth orifice union and labyrinth overcoat (1) is enclosed in the periphery of labyrinth inner core (2), cavity is between the two communicated with the entrance and exit of outside pressure-bearing body (5) runner that forms this throttle structure, the basic shape of labyrinth overcoat (1) is multistage cylindrical shape, Intermediate Gray is multiple tabular, perpendicular to cylinder axis, the tabula (3) that endoporus is concentric with cylinder, the basic shape of labyrinth inner core (2) is the multistage cylindrical of one end band disc base plate (4), cylinder is middle also with multiple tabular, perpendicular to cylinder axis, the tabula (3) of cylindrical and cylindrical-concentric, the external diameter of the external diameter of base plate (4) and labyrinth overcoat (1), the endoporus aperture of outside pressure-bearing body (5) is identical, base plate (4) overlays on the left side of labyrinth overcoat (1), the left part of outside pressure-bearing body (5) is in combination, when welding, compress labyrinth orifice union by the left side of base plate (4) that compresses labyrinth inner core (2), several uniform through holes that distributing on base plate (4) enter the passage of labyrinth orifice union as medium, tabula (3) on labyrinth overcoat (1) is staggered successively with the tabula (3) on labyrinth inner core (2), be that adjacent two tabulas (3) are respectively the tabula on tabula and the labyrinth inner core (2) on labyrinth overcoat (1), between adjacent two tabulas (3), keep certain interval, and also all keep certain interval between cylindrical hole diameter between cylndrical surface external diameter on internal diameter and the labyrinth inner core (2) of the tabula (3) of labyrinth overcoat (1) and on external diameter and the labyrinth overcoat (1) of the tabula (3) of labyrinth inner core (2), said structure has jointly been formed and has been made continuously 90 ° of labyrinth shape passages that turn to therein can allow fluid flow time by the cylndrical surface of the cylindrical hole of labyrinth overcoat (1), labyrinth inner core (2) and the tabula (3) above both between labyrinth overcoat (1) and labyrinth inner core (2).In addition, described multistage columnar labyrinth overcoat (1) is by by the section plane of its center line---and labyrinth overcoat divides tangent plane (6) that its point is cut to two identical and symmetrical two-part and is formed; When assembling, two-part are closed, are enclosed in to the periphery of labyrinth inner core (2), put into the endoporus of outside pressure-bearing body (5) right side body part together with labyrinth inner core (2), the left part, the compression labyrinth orifice union that cover outside pressure-bearing body (5) carry out spot welding, complete welding again.
Embodiment two
Adopting the technological scheme of axial flow labyrinth throttle structure proposed by the invention can be made into independently parts---axial flow labyrinth flow controller, uses as piping attachment.Be the schematic diagram that axial flow labyrinth flow controller and valve matched use as shown in Figure 2, the entrance of axial flow labyrinth flow controller is connected by welding with valve export, and medium enters valve from left side, and axial flow labyrinth flow controller right-hand member is media outlet.
The quantity of the tabula on labyrinth overcoat (1) and the labyrinth inner core (2) of axial flow labyrinth flow controller has determined the progression of labyrinth throttle structure, in the present embodiment, tabula quantity on labyrinth overcoat (1) is 2, tabula quantity on labyrinth inner core (2) is 3, the turning progression of labyrinth throttle structure is 12 grades, and this is to require to determine according to the operating pressure differential at this valve installation position and concrete reduction of speed noise reduction.Because the entrance medium of this valve is high temperature the water that approaches saturation state, export the steam that is converted into low pressure because of step-down, therefore in the orifice union of labyrinth, there is water to be converted into the process of steam, and after the lower volumetric expansion of pressure more downstream, density is also less, flow velocity is also faster, thereby Flow area also should be more larger toward downstream.In the present embodiment, this is that above external diameter, the internal diameter of the upper cylindrical holes at different levels of adjustment labyrinth overcoat (1) and the external diameter of the upper cylndrical surface at different levels of labyrinth inner core (2) of tabula are realized for the spacing by adjusting tabula, the internal diameter of adjusting the upper tabula of labyrinth overcoat (1) and labyrinth inner core (2).
Embodiment three
Axial flow labyrinth throttle structure proposed by the invention also can design in valve internal the part as valve mechanism, as shown in Figure 3.
The valve (7) of the present embodiment is for boiler water blowdown, because entrance medium is the high-pressure furnace water in drum, the logical atmosphere of outlet, valve working pressure reduction is high, therefore the inlet side in valve (8) is provided with built-in axial flow labyrinth throttle structure, making by the medium at valve sealing face place is the low water that forces down flow velocity, thereby can solve the existing sealing surface of current station boiler High Pressure Difference sewage draining valve erosion damage leaks seriously because being subject to, valve working life is short, vibrating noise is large problem.
Because the circulation area of the labyrinth flow-path of axial flow labyrinth throttle structure is larger, the problem of easily being stopped up by impurity that therefore there will not be the High Pressure Difference throttle structure that resembles other conventionally to there will be; In addition, the axial direction of the present embodiment axis streaming labyrinth throttle structure is by Vertical direction setting, therefore in throttle structure, being also difficult for producing impurity accumulates, add at the design aspect of valve inner flow passage and noted avoiding the dead angle that easily causes impurity to accumulate, therefore valve can realize and can keep clear for a long time, reliable dirt eliminating function.
Labyrinth orifice union structure is as described in embodiment one; In the present embodiment, the valve body of valve (8) has formed the outside pressure-bearing body of axial flow labyrinth throttle structure; When product is manufactured, labyrinth overcoat (1) is first processed by entirety, then cuts open into identical and symmetrical two-part with line cutting, when assembling, packs in valve body (8) together with labyrinth inner core (2).
Below in conjunction with the accompanying drawings and embodiments the specific embodiment of the present invention is described, but these explanations can not be understood to limit scope of the present invention.Those skilled in the art should know; the present invention is not restricted to the described embodiments; its protection domain is defined by appending claims; any not exceeding the various changes in the scope that the claims in the present invention book defines, the technological scheme that modification forms; all do not depart from spirit of the present invention and technical spirit, within still can belonging to claim scope of the present invention.
Claims (2)
1. an axial flow labyrinth throttle structure, comprise labyrinth overcoat (1), labyrinth inner core (2), outside pressure-bearing body (5), it is characterized in that: in the outside pressure-bearing body (5) that comprises fluid input and fluid output, be provided with labyrinth orifice union, described labyrinth orifice union comprises labyrinth overcoat (1) and labyrinth inner core (2), the revolution build part that centered by labyrinth overcoat (1) and labyrinth inner core (2), line overlaps, the direction of the entrance and exit line of both centerline directions and outside pressure-bearing body (5) is coincide, labyrinth inner core (2) is at middle position and labyrinth overcoat (1) is enclosed in the periphery of labyrinth inner core (2), cavity in the middle of both is communicated with the entrance and exit of outside pressure-bearing body (5) runner that forms this throttle structure, the basic shape of labyrinth overcoat (1) is multistage cylindrical shape, Intermediate Gray is multiple tabular, perpendicular to cylinder axis, the tabula (3) that endoporus is concentric with cylinder, the basic shape of labyrinth inner core (2) is the multistage cylindrical of one end band disc base plate (4), cylinder is middle also with multiple tabular, perpendicular to cylinder axis, the tabula (3) of cylindrical and cylindrical-concentric, several through holes are distributing on base plate (4), tabula (3) on labyrinth overcoat (1) is staggered successively with the tabula (3) on labyrinth inner core (2), between adjacent two tabulas (3), keep certain interval, and also all keep certain interval between cylindrical hole diameter between cylndrical surface external diameter on internal diameter and the labyrinth inner core (2) of the tabula (3) of labyrinth overcoat (1) and on external diameter and the labyrinth overcoat (1) of the tabula (3) of labyrinth inner core (2), said structure between labyrinth overcoat (1) and labyrinth inner core (2) by the cylindrical hole of labyrinth overcoat (1), the cylndrical surface of labyrinth inner core (2) and the tabula (3) above both have formed 90 ° of labyrinth shape passages that turn to of continuous work can allow fluid flow time jointly therein, described multistage columnar labyrinth overcoat (1) is by by the section plane of its center line---and labyrinth overcoat divides tangent plane (6) that its point is cut to two identical and symmetrical two-part and is formed.
2. axial flow according to claim 1 labyrinth throttle structure, it is characterized in that: described outside pressure-bearing body (5) is made up of two-part, after labyrinth overcoat (1), labyrinth inner core (2) pack into, outside pressure-bearing body (5) combines, compresses, is welded as a whole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410162835.7A CN103968149A (en) | 2014-04-22 | 2014-04-22 | Axial-flow type maze throttling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410162835.7A CN103968149A (en) | 2014-04-22 | 2014-04-22 | Axial-flow type maze throttling structure |
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| CN103968149A true CN103968149A (en) | 2014-08-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410162835.7A Pending CN103968149A (en) | 2014-04-22 | 2014-04-22 | Axial-flow type maze throttling structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594971A (en) * | 2014-11-27 | 2015-05-06 | 重庆小康工业集团股份有限公司 | Bolt connection pair provided with oil passage |
| CN106931267A (en) * | 2017-03-31 | 2017-07-07 | 中核核电运行管理有限公司 | A kind of throttle orifice component of resistance to flowing accelerated corrosion |
| CN106939953A (en) * | 2017-03-31 | 2017-07-11 | 中核核电运行管理有限公司 | A kind of wear resistant filler lining throttle orifice component of sherardizing steel |
| CN106949333A (en) * | 2017-03-31 | 2017-07-14 | 中核核电运行管理有限公司 | A kind of ceramic chamber lining throttle orifice component of sherardizing steel |
| CN107750237A (en) * | 2015-03-30 | 2018-03-02 | 生态全球股份有限公司 | Sewage treatment equipment and the method for handling waste water |
| CN110538626A (en) * | 2019-08-28 | 2019-12-06 | 迈安德集团有限公司 | Variable controllable cavitator |
| CN111946930A (en) * | 2020-08-05 | 2020-11-17 | 国核电力规划设计研究院有限公司 | Pressure reduction and speed control assembly, sleeve and regulating valve |
| CN112066080A (en) * | 2020-07-31 | 2020-12-11 | 清华大学 | Noise reduction assembly for combined control valve and combined control valve |
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| US4258750A (en) * | 1978-11-13 | 1981-03-31 | Copes-Vulcan, Inc. | Labyrinth trim valve |
| US4367807A (en) * | 1980-05-30 | 1983-01-11 | Willy Fink | Sound absorber for compressed-air operated apparatuses, in particular compressed air vibrators |
| CN2314203Y (en) * | 1997-07-25 | 1999-04-14 | 清华大学 | Labyrinth style high pressure differential fluid regulating valve |
| CN201059387Y (en) * | 2007-07-23 | 2008-05-14 | 大庆市普罗石油科技有限公司 | Pipe high pressure difference regulator |
| CN201526678U (en) * | 2009-11-20 | 2010-07-14 | 重庆川仪十一厂有限公司 | Multistage decompression high-differential-pressure regulating valve |
| CN203880213U (en) * | 2014-04-22 | 2014-10-15 | 章华 | Axial-flow type labyrinth throttling structure |
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2014
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Patent Citations (6)
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| US4258750A (en) * | 1978-11-13 | 1981-03-31 | Copes-Vulcan, Inc. | Labyrinth trim valve |
| US4367807A (en) * | 1980-05-30 | 1983-01-11 | Willy Fink | Sound absorber for compressed-air operated apparatuses, in particular compressed air vibrators |
| CN2314203Y (en) * | 1997-07-25 | 1999-04-14 | 清华大学 | Labyrinth style high pressure differential fluid regulating valve |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104594971A (en) * | 2014-11-27 | 2015-05-06 | 重庆小康工业集团股份有限公司 | Bolt connection pair provided with oil passage |
| CN107750237A (en) * | 2015-03-30 | 2018-03-02 | 生态全球股份有限公司 | Sewage treatment equipment and the method for handling waste water |
| CN106931267A (en) * | 2017-03-31 | 2017-07-07 | 中核核电运行管理有限公司 | A kind of throttle orifice component of resistance to flowing accelerated corrosion |
| CN106939953A (en) * | 2017-03-31 | 2017-07-11 | 中核核电运行管理有限公司 | A kind of wear resistant filler lining throttle orifice component of sherardizing steel |
| CN106949333A (en) * | 2017-03-31 | 2017-07-14 | 中核核电运行管理有限公司 | A kind of ceramic chamber lining throttle orifice component of sherardizing steel |
| CN110538626A (en) * | 2019-08-28 | 2019-12-06 | 迈安德集团有限公司 | Variable controllable cavitator |
| CN110538626B (en) * | 2019-08-28 | 2023-10-13 | 迈安德集团有限公司 | Variable controllable cavitation device |
| CN112066080A (en) * | 2020-07-31 | 2020-12-11 | 清华大学 | Noise reduction assembly for combined control valve and combined control valve |
| CN112066080B (en) * | 2020-07-31 | 2022-02-11 | 清华大学 | Noise reduction assembly for combined control valve and combined control valve |
| CN111946930A (en) * | 2020-08-05 | 2020-11-17 | 国核电力规划设计研究院有限公司 | Pressure reduction and speed control assembly, sleeve and regulating valve |
| CN111946930B (en) * | 2020-08-05 | 2022-05-24 | 国核电力规划设计研究院有限公司 | Pressure reduction and speed control assembly, sleeve and regulating valve |
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Application publication date: 20140806 |