CN114198563B - Low-pressure high-flow direct-acting overflow valve - Google Patents
Low-pressure high-flow direct-acting overflow valve Download PDFInfo
- Publication number
- CN114198563B CN114198563B CN202111438845.5A CN202111438845A CN114198563B CN 114198563 B CN114198563 B CN 114198563B CN 202111438845 A CN202111438845 A CN 202111438845A CN 114198563 B CN114198563 B CN 114198563B
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- gland
- valve body
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- 230000007246 mechanism Effects 0.000 claims abstract description 8
- 210000004907 gland Anatomy 0.000 claims description 35
- 238000007789 sealing Methods 0.000 claims description 14
- 230000001681 protective effect Effects 0.000 claims description 6
- 238000013461 design Methods 0.000 abstract description 10
- 238000000034 method Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 8
- 239000012530 fluid Substances 0.000 abstract description 6
- 239000007788 liquid Substances 0.000 abstract description 6
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000010349 pulsation Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000013022 venting Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F16K47/023—Means in valves for absorbing fluid energy for preventing water-hammer or noise for preventing water-hammer, e.g. damping of the valve movement
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
Abstract
The invention discloses a low-pressure high-flow direct-acting overflow valve, which comprises a valve body, wherein a valve core and a flow adapting ring are arranged in the valve body, one end of the valve core is provided with an inner cavity, the other end of the valve core is provided with a parabolic structure, and the flow adapting ring is fixed in the valve body and corresponds to the parabolic structure; an elastic piece is arranged in the inner cavity and is connected with a fixed pre-tightening mechanism arranged on the valve body. According to the valve core, through the design of the parabolic structure body, the phenomenon of pressure overshoot caused by flow impact in the opening process of the overflow valve is reduced, and the flow has quick opening characteristics after the valve core is opened, so that liquid is quickly discharged; meanwhile, when the overflow valve is fully opened, the valve core always keeps stable vibration of the valve core without radial movement under the impact of large flow, so that the vibration is reduced when the valve core impacts the valve port, and the reliability of the overflow valve is ensured. By adding the specially designed flow adapting ring, the hydraulic cavitation phenomenon is eliminated, and the impact of fluid on the valve core in the working process is effectively reduced.
Description
Technical Field
The invention relates to the technical field of overflow valves, in particular to a low-pressure high-flow direct-acting overflow valve.
Background
The overflow valve is a hydraulic pressure control valve, and mainly plays roles of constant pressure overflow, pressure stabilization, system unloading and safety protection in hydraulic equipment. The existing domestic and foreign direct-acting overflow valve cannot meet the pressure regulating range of 4-12 Bar under the working condition of 150-450L/min of high flow, and cannot be regulated to 0.4Bar low pressure under the working condition of 150-450L/min of high flow. In addition, the domestic direct-acting overflow valve cannot meet the requirements of a low-pressure high-flow system, in the opening process of the valve, oil flows in a high-speed jet way, the flow speed and the direction of fluid micro-clusters are changed sharply, and in the flowing process, the fluid passes through a throttling position, so that cavitation, vortex, pulsation and other excitation flow states are easy to induce, pressure fluctuation is caused, vibration of elements in the valve is caused, and therefore the pressure fluctuation is further enhanced, and the working performance of the valve is reduced.
Disclosure of Invention
Aiming at the defects in the background technology, the invention provides a low-pressure high-flow direct-acting overflow valve, which solves the technical problems.
The technical scheme of the invention is realized as follows: the low-pressure high-flow direct-acting overflow valve comprises a valve body, wherein a valve core and a flow adapting ring are arranged in the valve body, one end of the valve core is provided with an inner cavity, the other end of the valve core is provided with a parabolic structure, and the flow adapting ring is fixed in the valve body and corresponds to the parabolic structure; an elastic piece is arranged in the inner cavity and is connected with a fixed pre-tightening mechanism arranged on the valve body.
The flow adapting ring is a dumbbell-shaped structure body, and flow passage through holes are formed in two ends of the dumbbell-shaped structure body. The dumbbell-shaped structural body comprises a concave disc part and a central shaft part which are symmetrically arranged, the flow passage through holes are uniformly distributed on the concave disc part, and the central axis of the central shaft part coincides with the central axis of the concave disc part.
The outer end face of the concave disc part is an arc spherical surface, and the intersection point of the central axes of the runner through holes is positioned on the central axis of the concave disc part. The parabolic structures are uniformly arranged along the circumferential direction of the valve core, and a parabolic groove is formed between two adjacent parabolic structures.
The parabolic structure body and the valve core are integrally formed, and the central axis of the valve core is coincident with the central axis of the flow adapting ring. A radial through hole is formed in one side of the inner hole cavity; the valve core is matched with the shoulder surface of the valve body.
The fixed pre-tightening mechanism comprises a spring seat, a gland and an adjusting screw, the gland is fixed on the valve body, the spring seat is positioned in the gland, one end of the elastic piece is positioned in the inner cavity, the other end of the elastic piece is connected with the spring seat, the adjusting screw penetrates through the gland to be matched with the spring seat, and the adjusting screw is in threaded connection with the gland.
One end of the adjusting screw, which extends out of the gland, is provided with a sealing nut, and a gasket is arranged between the sealing nut and the gland; a sealing ring is arranged between the gland and the valve body, and one side of the gland is provided with an exhaust screw. The gland and the adjusting screw are both positioned in the protective cover, and the protective cover is detachably connected with the valve body.
According to the valve core, through the design of the parabolic structure body, the phenomenon of pressure overshoot caused by flow impact in the opening process of the overflow valve is reduced, and the flow has quick opening characteristics after the valve core is opened, so that liquid is quickly discharged; meanwhile, when the overflow valve is fully opened, the valve core always keeps stable vibration of the valve core without radial movement under the impact of large flow, so that the vibration is reduced when the valve core impacts the valve port, and the reliability of the overflow valve is ensured. Through increasing the flow adaptation ring of special design, eliminate hydraulic cavitation phenomenon, effectively reduce the impact of fluid to the case in the course of the work, greatly reduced noise ensures that overflow valve has good stability, further increase of service life. According to the invention, through optimizing the valve core, the gland and the spring seat structure and adjusting the design parameters of the spring structure, the flow adapting ring structure is innovatively increased, so that the pressure regulating range of the overflow valve in a large flow state is kept at 3.2-16 Bar, breakthrough innovation is realized, and the valve has higher market value.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the drawings that are required for the description of the embodiments will be briefly described below, it being apparent that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a schematic view of the inside of the overall structure of the present invention.
Fig. 2 is an enlarged view of a portion of the gland of the present invention.
Fig. 3 is a schematic structural diagram of a flow adapting ring according to the present invention.
FIG. 4 is a schematic diagram of a half-section structure of a valve element of the present invention.
FIG. 5 is a schematic side view of the valve cartridge of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 and 2, embodiment 1 is a low-pressure high-flow direct-acting overflow valve, which comprises a valve body 1, wherein a nameplate 2 is arranged on the valve body, and the nameplate 2 is fixed by rivets 15. The valve body is vertically provided with an oil inlet P, and is transversely provided with an oil return port T, and the valve core is positioned between the P port and the T port and is used for controlling the on-off of the valve core. The valve body 1 is internally provided with a valve core 3 and a flow adapting ring 16, and the flow adapting ring is arranged close to the P port end and is positioned at the liquid inlet end of the valve core. The flow adapting ring may be fixed to the hair by spot welding. One end of the valve core 3 is provided with an inner cavity 31, the other end of the valve core is provided with a parabolic structure body 32, and the parabolic structure body 32 is arranged on the valve core in a split manner, so that the phenomenon of pressure overshoot caused by flow impact in the opening process of the overflow valve is reduced. The radial through hole 14 is arranged on one side of the inner hole cavity 31, and a small hole with the diameter of 3mm can be adopted for the through hole, and the small hole has a pressure relief effect. The valve core 3 is matched with the shoulder surface of the valve body to form two seals, so that the sealing effect is improved. The flow adapting ring 16 is fixed in the valve body 1 and corresponds to the parabolic structure 32, namely, the flow adapting ring 16 is positioned at one end opposite to the parabolic structure, which is beneficial to eliminating the hydraulic cavitation phenomenon and effectively reducing the impact of fluid on the valve core in the working process. An elastic piece 8, preferably a spring, is arranged in the inner hole cavity 31, and the elastic piece 8 is connected with a fixed pre-tightening mechanism arranged on the valve body 1; under the action of the fixed pre-tightening mechanism, the elastic piece can be fixed in the valve body and can be used for effectively adjusting the pre-tightening force.
As shown in fig. 3, in embodiment 2, a low-pressure high-flow direct-acting overflow valve is provided, on the basis of embodiment 1, the flow adapting ring 16 is a dumbbell-shaped structure, the dumbbell-shaped structure is a symmetrical structure, and two ends of the dumbbell-shaped structure are provided with a plurality of flow passage through holes 17 for eliminating hydraulic cavitation.
Further, preferably, the dumbbell structure includes a concave disc portion 16-1 and a central shaft portion 16-2 which are symmetrically arranged, and the concave disc portion 16-1 and the central shaft portion 16-2 are integrally formed. The flow passage through holes 17 are uniformly distributed on the concave disc parts 16-1, and the positions and the number of the flow passage through holes on the concave disc parts at the two ends are the same. The central axis of the central shaft portion 16-2 coincides with the central axis of the concave disc portion 16-1. The outer end surface of the concave disc portion 16-1 is a circular arc sphere, and the intersection point of the central axes of the flow passage through holes 17 is located on the central axis of the concave disc portion 16-1.
Different inherent flow characteristics can be realized by designing different through hole sizes and position distributions of the flow channels, and the design of the through hole type adaptive ring of the flow channels is to combine approximate calculation and modeling simulation to determine an optimized structure on the basis of flow tests. And then calculating the flow area of the window according to the required inherent flow characteristics, thereby obtaining the preliminary scheme of the size and distribution of the through holes of the flow channel. And carrying out finite element calculation on the primary design result of the flow adapting ring and the valve body flow channel, and further correcting the size and distribution of the flow channel through holes according to the calculation result. The flow passage through hole window adopts a symmetrical design, so that the fluid is converged at the axis of the adapting ring after passing through the window, the liquids collide with each other, and high turbulence is generated between the channels, thereby the kinetic energy of the liquid in the overflow valve is dissipated due to mutual friction, and the formation of bubbles is reduced. The formed bubbles are mostly broken at the center of the adapting ring, so that direct damage to the surfaces of the valve seat and the valve clack is avoided, the overflow valve is ensured to run stably and reliably under the working condition of high flow, and the noise is reduced to below 50 db.
As shown in fig. 4 and 5, it is further preferable to design: the parabolic structure 32 and the valve core 3 are integrally formed, and the central axis of the valve core 3 coincides with the central axis of the flow adapting ring 16. The parabolic structures 32 are uniformly arranged along the circumferential direction of the valve core 3, and a parabolic groove is formed between two adjacent parabolic structures 32.
According to test verification, when the performance of the overflow valve is tested before optimization, the overflow valve is high in vibration and noise, so that the flow is unstable, and the adjustability of the high-flow low-pressure condition is poor. According to the structural design, through optimizing the valve core structure, fit clearance, hydrodynamic analysis and simulation of the overflow valve, the valve core structure is designed into a circular flow channel parabolic structure, the pressure overshoot phenomenon caused by flow impact in the opening process of the overflow valve is reduced, the flow has the characteristic of quick opening after the valve core is opened, liquid is discharged quickly, the valve core always keeps stable vibration of the valve core without radial movement under the impact of large flow when the overflow valve is fully opened, the vibration is reduced when the valve core impacts the valve port, and the reliability of the overflow valve is ensured.
As shown in fig. 1, in embodiment 3, a low-pressure high-flow direct-acting overflow valve is provided, the fixed pre-tightening mechanism comprises a spring seat 4, a gland 5 and an adjusting screw 6, the gland 5 is fixed on the valve body 1, the spring seat 4 is located in the gland 5, and the spring seat is matched with the size and limit of the gland. One end of the elastic piece 8 is positioned in the inner cavity 31, the other end of the elastic piece is connected with the spring seat 4, and the elastic piece adopts a spring. The adjusting screw rod 6 passes through the gland 5 to be matched with the spring seat 4; the adjusting screw rod is matched with the groove on the end face of the spring seat, namely, the upper end face of the gland is propped against. The adjusting screw 6 is in threaded connection with the gland 5, and the pretightening force of the spring is adjusted by rotating the adjusting screw.
One end of the adjusting screw 6 extending out of the gland 5 is provided with a sealing nut 12, and a gasket 7 is arranged between the sealing nut 12 and the gland 5; sealing the thread of the adjusting screw through the sealing nut, so that leakage of the thread is prevented when the screw is adjusted; a sealing ring 11 is arranged between the gland 5 and the valve body 1 to finish sealing and control the leakage of the product. One side of the gland 5 is provided with a vent screw 13 for venting gas inside the valve body. The gland 5 and the adjusting screw 6 are both positioned in the protective cover 10, and the protective cover 10 is detachably connected with the valve body 1, so that the overall tightness is improved. When the overflow valve is opened, the sealing nut is unscrewed, the adjusting screw is enabled to rotate upwards through the inner hexagon at the adjusting screw, and then the spring seat is driven to move upwards, so that the valve core is fully opened, and the low-pressure and high-flow work of the overflow valve is met; when the pressure and the flow of the system are required to be controlled, the adjusting screw is screwed down, the nut is fixed, the valve core and the valve body are completely closed, and the system has no flow.
Through the mode, the valve core, the gland and the spring seat structure of the product are optimized, the design parameters of the spring structure are adjusted, the flow adapting ring structure is innovatively increased, the optimized overflow valve is verified by experiments, the pressure regulating range is 3.2-16 Bar under the condition of high flow rate of 150-450L/min, and the development requirement is met.
Other structures are the same as those of embodiment 2.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The utility model provides a low pressure large-traffic direct acting overflow valve, includes valve body (1), its characterized in that: a valve core (3) and a flow adapting ring (16) are arranged in the valve body (1), one end of the valve core (3) is provided with an inner cavity (31), the other end of the valve core is provided with a parabolic structure (32), and the flow adapting ring (16) is fixed in the valve body (1) and corresponds to the parabolic structure (32); an elastic piece (8) is arranged in the inner hole cavity (31), and the elastic piece (8) is connected with a fixed pre-tightening mechanism arranged on the valve body (1);
the flow adapting ring (16) is a dumbbell-shaped structure body, and two ends of the dumbbell-shaped structure body are provided with flow passage through holes (17);
the dumbbell-shaped structure comprises a concave disc part (16-1) and a central shaft part (16-2) which are symmetrically arranged, wherein the flow passage through holes (17) are uniformly distributed on the concave disc part (16-1), and the central axis of the central shaft part (16-2) is overlapped with the central axis of the concave disc part (16-1);
the outer end surface of the concave disc part (16-1) is an arc spherical surface, and the intersection point of the central axes of the runner through holes (17) is positioned on the central axis of the concave disc part (16-1).
2. The low pressure, high flow direct acting relief valve of claim 1, wherein: the parabolic structures (32) are uniformly arranged along the circumferential direction of the valve core (3), and a parabolic groove is formed between two adjacent parabolic structures (32).
3. The low pressure, high flow direct acting relief valve of claim 2, wherein: the parabolic structure body (32) and the valve core (3) are integrally formed, and the central axis of the valve core (3) is coincident with the central axis of the flow adapting ring (16).
4. A low pressure, high flow, direct acting relief valve as claimed in claim 3 wherein: a radial through hole (14) is formed in one side of the inner hole cavity (31); the valve core (3) is matched with the valve body shoulder surface.
5. The low pressure, high flow, direct acting relief valve of any one of claims 1-4, wherein: the fixed pretension mechanism comprises a spring seat (4), a gland (5) and an adjusting screw (6), wherein the gland (5) is fixed on the valve body (1), the spring seat (4) is positioned in the gland (5), one end of the elastic piece (8) is positioned in the inner cavity (31), the other end of the elastic piece is connected with the spring seat (4), the adjusting screw (6) penetrates through the gland (5) to be matched with the spring seat (4), and the adjusting screw (6) is in threaded connection with the gland (5).
6. The low pressure, high flow direct acting relief valve of claim 5, wherein: one end of the adjusting screw (6) extending out of the gland (5) is provided with a sealing nut (12), and a gasket (7) is arranged between the sealing nut (12) and the gland (5); a sealing ring (11) is arranged between the gland (5) and the valve body (1), and an exhaust screw (13) is arranged on one side of the gland (5).
7. The low pressure, high flow direct acting relief valve of claim 6, wherein: the gland (5) and the adjusting screw (6) are both positioned in the protective cover (10), and the protective cover (10) is detachably connected with the valve body (1).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111395568 | 2021-11-23 | ||
| CN2021113955684 | 2021-11-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114198563A CN114198563A (en) | 2022-03-18 |
| CN114198563B true CN114198563B (en) | 2024-01-19 |
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ID=80649612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111438845.5A Active CN114198563B (en) | 2021-11-23 | 2021-11-27 | Low-pressure high-flow direct-acting overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114198563B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1307986A (en) * | 1919-06-24 | Valve | ||
| US3503585A (en) * | 1967-05-23 | 1970-03-31 | Sulzer Ag | Valve |
| CN102943909A (en) * | 2012-10-19 | 2013-02-27 | 华中科技大学 | Differential type water hydraulic relief valve |
| CN104019258A (en) * | 2014-06-26 | 2014-09-03 | 华中科技大学无锡研究院 | Double-damping direct-acting type hydraulic pressure overflowing valve |
| CN104040233A (en) * | 2011-12-16 | 2014-09-10 | Cla-Val公司 | Anti-cavitation valve seat |
| CN104633134A (en) * | 2015-02-10 | 2015-05-20 | 无锡智能自控工程股份有限公司 | Hydrocracking heat highly-distributing high-pressure regulating angle valve |
| CN105402418A (en) * | 2014-09-16 | 2016-03-16 | 江苏神通阀门股份有限公司 | Angular regulating valve |
| CN207229789U (en) * | 2017-09-28 | 2018-04-13 | 浙江力诺流体控制科技股份有限公司 | U-shaped noise reduction cage type regulating valve |
| CN108644414A (en) * | 2018-06-08 | 2018-10-12 | 江西欧科思瑞工业控制阀有限公司 | Regulating valve is blocked in balanced type threeway |
-
2021
- 2021-11-27 CN CN202111438845.5A patent/CN114198563B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1307986A (en) * | 1919-06-24 | Valve | ||
| US3503585A (en) * | 1967-05-23 | 1970-03-31 | Sulzer Ag | Valve |
| CN104040233A (en) * | 2011-12-16 | 2014-09-10 | Cla-Val公司 | Anti-cavitation valve seat |
| CN102943909A (en) * | 2012-10-19 | 2013-02-27 | 华中科技大学 | Differential type water hydraulic relief valve |
| CN104019258A (en) * | 2014-06-26 | 2014-09-03 | 华中科技大学无锡研究院 | Double-damping direct-acting type hydraulic pressure overflowing valve |
| CN105402418A (en) * | 2014-09-16 | 2016-03-16 | 江苏神通阀门股份有限公司 | Angular regulating valve |
| CN104633134A (en) * | 2015-02-10 | 2015-05-20 | 无锡智能自控工程股份有限公司 | Hydrocracking heat highly-distributing high-pressure regulating angle valve |
| CN207229789U (en) * | 2017-09-28 | 2018-04-13 | 浙江力诺流体控制科技股份有限公司 | U-shaped noise reduction cage type regulating valve |
| CN108644414A (en) * | 2018-06-08 | 2018-10-12 | 江西欧科思瑞工业控制阀有限公司 | Regulating valve is blocked in balanced type threeway |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114198563A (en) | 2022-03-18 |
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