CN107956902B - Throttle valve - Google Patents
Throttle valve Download PDFInfo
- Publication number
- CN107956902B CN107956902B CN201711029599.1A CN201711029599A CN107956902B CN 107956902 B CN107956902 B CN 107956902B CN 201711029599 A CN201711029599 A CN 201711029599A CN 107956902 B CN107956902 B CN 107956902B
- Authority
- CN
- China
- Prior art keywords
- cavity
- valve core
- valve body
- valve
- sealing ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 45
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 210000001503 joint Anatomy 0.000 claims description 3
- 238000000034 method Methods 0.000 claims description 2
- 230000035945 sensitivity Effects 0.000 abstract description 5
- 230000000694 effects Effects 0.000 description 2
- 206010033799 Paralysis Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/22—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution
- F16K3/24—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with sealing faces shaped as surfaces of solids of revolution with cylindrical valve members
- F16K3/243—Packings
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/34—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Sliding Valves (AREA)
Abstract
The invention provides a throttle valve with novel structural design and high sensitivity; the valve comprises a valve body and a valve core arranged in the valve body; the valve body is longitudinally provided with a flow passage penetrating through the valve body, a valve core cavity is arranged in the valve body, one end of the valve core cavity is opened, the other end of the valve core cavity penetrates through the flow passage to stop at the middle part of the valve body, and a closed groove is formed in the valve body away from the closed end in the direction of the opening end of the valve core cavity; the valve core is positioned in the valve core cavity, a tail cap is arranged in the opening end of the valve core cavity, and the valve core penetrates through the tail cap and is in threaded connection with the tail cap; the valve core end close to one end of the closing groove is provided with a first rubber sealing ring, the middle front part of the valve core close to the first rubber sealing ring is provided with a second rubber sealing ring, and the first rubber sealing ring and the second rubber sealing ring are arranged at intervals.
Description
Technical Field
The invention relates to a throttle valve.
Background
A throttle valve is a valve for controlling the flow rate of a fluid by changing the throttle cross section or the throttle length, and referring to fig. 1, a conventional throttle valve is composed of a valve body and a valve core in the valve body, and the flow rate is changed by changing the cross section of the valve core to a flow passage.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to the actual needs and provide a throttle valve with novel structural design and high sensitivity.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
The throttle valve comprises a valve body and a valve core arranged in the valve body; the valve body is longitudinally provided with a flow passage penetrating through the valve body, a valve core cavity is arranged in the valve body, one end of the valve core cavity is opened, the other end of the valve core cavity penetrates through the flow passage to stop at the middle part of the valve body, and a closed groove is formed in the valve body away from the closed end in the direction of the opening end of the valve core cavity; the valve core is positioned in the valve core cavity, and the end part of the valve core positioned in the valve body can be inserted into the closed groove; a tail cap is arranged in the opening end of the valve core cavity, and the valve core penetrates through the tail cap and is in threaded connection with the tail cap; the valve core end close to one end of the closed groove is provided with a first rubber sealing ring, the middle front part of the valve core close to the first rubber sealing ring is provided with a second rubber sealing ring, the first rubber sealing ring and the second rubber sealing ring are arranged at intervals, when the end part of the valve core is embedded into the closed groove and is in a closed state, the first rubber sealing ring is positioned in the closed groove on the right side of the oil duct, and the second rubber sealing ring is positioned in a valve core cavity on the left side of the oil duct.
Preferably, the valve core cavity at the left side of the oil duct is composed of a front cavity and a tail cavity which are in butt joint, the inner diameter of the front cavity is smaller than that of the tail cavity, a step is formed at the joint of the front cavity and the tail cavity, an annular retainer ring is arranged at the middle part of a valve core in the tail cavity, and a spring is sleeved on the valve core between the annular retainer ring and the step.
Preferably, an annular groove is arranged on the valve core in the front cavity, and the annular groove is positioned between the second rubber sealing ring and the spring.
Preferably, the front end edge of the valve core is of a round corner structure.
Preferably, the circumference of the opening end of the closed groove on the side wall of the flow channel is in a round corner structure.
The valve core is provided with two annular grooves which are arranged at intervals, and the first rubber sealing ring and the second rubber sealing ring are respectively positioned in the corresponding annular grooves.
The tail cap is in threaded connection with the tail cavity.
Preferably, the flow passage and the valve core which are arranged in the valve body are two and symmetrically arranged.
Preferably, a middle throttling cavity is arranged between the two flow passages, the middle throttling cavity is arranged in the middle of the valve body, the closed grooves at the end parts of the two flow passages in the valve body are communicated with the middle throttling cavity, and the flow passages at the two sides of the valve body are communicated through the two closed grooves; the middle throttle chamber is internally provided with a push rod, the opening end part of the middle throttle chamber on the side wall of the valve body is provided with a connecting tail cap, the connecting tail cap is in threaded connection with the middle throttle chamber, the push rod is connected with the tail cap in a penetrating manner and in threaded connection with the connecting tail cap, the closed end of the middle throttle chamber in the direction far away from the opening end part of the middle throttle chamber forms a closed groove in the valve body, and the end part of the push rod in the valve body can be inserted into the closed groove.
Preferably, a sealing rubber ring is arranged on the push rod in the middle throttling cavity, the edge of the end part of the push rod in the valve body is a round angle, and the edge of the opening end of the closed groove is a round angle.
The invention has the beneficial effects that:
the design has novel structural design and high sensitivity, and can avoid axial deflection of the valve core in the valve body through the elasticity of the spring to the valve core in use, so that the sensitivity of the throttle valve is improved, and secondly, the throttle valve has good sealing effect in a completely closed state and can not cause oil leakage and oil seepage.
Drawings
FIG. 1 is a schematic diagram of a prior art throttle valve;
FIG. 2 is a schematic cross-sectional view of the present invention;
FIG. 3 is an enlarged schematic view of the portion A in FIG. 2;
FIG. 4 is a schematic cross-sectional view of another embodiment of the present invention;
in the figure: 1. seventhly, a valve core; 2, 10, a tail cap, 3, an annular retainer ring, 4, a second rubber seal ring, 5, 8, a runner, 6, a valve core end, 7, a closing groove, 11, a valve body, 12, a tail cavity, 13, a spring, 14, an annular groove, 15, a first rubber seal ring, 16, a front end edge of the valve core, 17, a closing groove opening end circumference, 18, a closing groove, 19, a push rod end edge, 20, a closing groove opening end edge, 21, a push rod, 22, a connecting tail cap and 23, a sealing rubber ring.
Detailed Description
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
Example 1: a throttle valve, see fig. 2, 3; the valve comprises a valve body 11 and a valve core 1 arranged in the valve body 11; the valve body 11 is longitudinally provided with flow passages 5 and 8 which longitudinally penetrate through the valve body 11, a valve core cavity is arranged in the valve body, one end of the valve core cavity is opened, the other end of the valve core cavity penetrates through the flow passage to stop at the middle part of the valve body 11, and a closed end far away from the direction of the opening end of the valve core cavity forms a closed groove 7 in the valve body; the valve core 1 is positioned in the valve core cavity, and the valve core end 6 positioned in the valve body 11 can be inserted into the closed groove 7.
Further, a tail cap 2 is arranged in the opening end of the valve core cavity in the design, the valve core cavity positioned at the left side of the oil duct 5 is composed of a front cavity and a tail cavity 12 which are in butt joint, and the tail cap is in threaded connection with the tail cavity; the inner diameter of the front cavity is smaller than that of the tail cavity, a step is formed at the joint of the front cavity and the tail cavity 12, an annular check ring 3 is arranged in the middle of the valve core in the tail cavity, a spring 13 is sleeved on the valve core between the annular check ring and the step, and thrust to the outside is applied to the valve core through the spring.
The valve core 1 in the design penetrates through the tail cap 2 and is in threaded connection with the tail cap 2; a first rubber sealing ring 15 is arranged at the end part of the valve core close to one end of the closing groove 7, a second rubber sealing ring 4 is arranged at the middle front part of the valve core close to the first rubber sealing ring 15, the first rubber sealing ring 15 and the second rubber sealing ring 4 are arranged at intervals, two annular grooves which are arranged at intervals are arranged on the valve core, and the first rubber sealing ring and the second rubber sealing ring are respectively positioned in the corresponding annular grooves; when the end part of the valve core 1 is embedded into the closed groove 7 and is in a closed state, the first rubber sealing ring 15 is positioned in the closed groove on the right side of the oil duct, and the second rubber sealing ring 4 is positioned in the valve core cavity on the left side of the oil duct.
Furthermore, the design is also provided with an annular groove on the valve core 1 positioned in the front cavity, the annular groove is positioned between the second rubber sealing ring and the spring, the contact area between the valve core and the inner part of the valve core cavity can be reduced through the annular groove, meanwhile, the friction force between the valve core and the valve core cavity can be reduced, and the portability and the flexibility of the valve core during movement are improved.
Furthermore, the front end edge 16 of the valve core in the design is of a round corner structure, meanwhile, the round periphery 17 of the opening end of the closed groove on the side wall of the flow channel is also of a round corner structure, compared with the existing right-angle design, the stability of the valve core when entering the closed groove can be improved, the phenomenon that the end of the valve core is blocked when radially deflected is avoided, meanwhile, in the moving process of the valve core, the flow channel can be opened when the surface of the end of the valve core is on the same surface as the surface of the opening end of the closed groove, the existing right-angle design is in a closed state at any time, the sensitivity of the throttle valve can be improved, and the throttle valve is more suitable for low-pressure oil path control.
As shown in the figure, the flow passages 5, 8 and the valve cores 1, 9 are symmetrically arranged in the valve body 1.
When the throttle valve is in a closed state, the valve core end 6 of the throttle valve enters the closed groove, at the moment, the first rubber sealing ring 15 is positioned in the closed groove, the second rubber sealing ring 4 is positioned in the valve core cavity, good sealing effect is achieved through the first rubber sealing ring and the second rubber sealing ring 4, and oil seepage phenomenon can be avoided; when the flow channel is required to be opened and throttled, the valve core is pushed out to the outer side of the valve body by the rotary valve core, the throttling purpose is achieved through the stopping area of the end part of the valve core to the flow channel, the state at the moment can be seen in the state shown in the figure 2, at the moment, the spring exerts elastic force on the push rod, the stability of the valve core can be kept through paralyzed elastic force, the phenomenon that the axial movement (the moving distance is 0.1-0.5 mm) of the valve core is caused by axial deviation of the threads connected with the tail cap of the valve core is avoided, and the stability, the accuracy and the operation convenience of the throttle valve can be improved in sequence.
Embodiment 2, see fig. 4, is the same as embodiment 1, and is not described in detail, and is different in that a middle throttling cavity is arranged between the two flow passages 5, 8 in the throttling valve in the design, the middle throttling cavity is arranged in the middle of the valve body 1, the closed grooves 7 at the end parts of the two flow passages in the valve body are all communicated with the middle throttling cavity, and the flow passages at the two sides of the valve body are communicated through the two closed grooves; the middle throttle chamber is internally provided with a push rod 21, the opening end part of the middle throttle chamber positioned on the side wall of the valve body is provided with a connecting tail cap 22, the connecting tail cap 22 is in threaded connection with the middle throttle chamber, the push rod penetrates through the connecting tail cap and is in threaded connection with the connecting tail cap, the closed end of the middle throttle chamber in the direction far away from the opening end part of the middle throttle chamber forms a closed groove 19 in the valve body, and the end part of the push rod positioned in the valve body can be inserted into the closed groove 18.
Similarly, in the design, a sealing rubber ring 23 is arranged on the push rod in the middle throttling cavity, the edge 19 of the end part of the push rod in the valve body is a round angle, and the edge 20 of the opening end of the closed groove is also a round angle.
The central throttle chamber of the present design has several uses in use:
1. The push rod is positioned in the closed groove to isolate the two oil channels, and the throttle valve is used as a double-channel throttle valve;
2. The push rod is pushed out of the closed groove to communicate the two oil channels, and the two oil channels are used as one oil channel, so that the total flow of the two oil channels can be increased;
3. one of the two oil channels is closed, and the push rod is detached from the valve body to change the single oil channel output into the double oil channel output.
The embodiments of the present invention are disclosed as preferred embodiments, but not limited thereto, and those skilled in the art will readily appreciate from the foregoing description that various extensions and modifications can be made without departing from the spirit of the present invention.
Claims (1)
1. A throttle valve comprises a valve body and a valve core arranged in the valve body; the valve body is longitudinally provided with a flow passage penetrating through the valve body, a valve core cavity is arranged in the valve body, one end of the valve core cavity is opened, the other end of the valve core cavity penetrates through the flow passage to stop at the middle part of the valve body, and a closed groove is formed in the valve body away from the closed end in the direction of the opening end of the valve core cavity; the valve core is positioned in the valve core cavity, and the end part of the valve core positioned in the valve body can be inserted into the closed groove; the method is characterized in that: a tail cap is arranged in the opening end of the valve core cavity, and the valve core penetrates through the tail cap and is in threaded connection with the tail cap; the valve core end close to one end of the closed groove is provided with a first rubber sealing ring, the middle front part of the valve core near the first rubber sealing ring is provided with a second rubber sealing ring, the first rubber sealing ring and the second rubber sealing ring are arranged at intervals, when the end part of the valve core is embedded into the closed groove and is in a closed state, the first rubber sealing ring is positioned in the closed groove on the right side of the oil duct, and the second rubber sealing ring is positioned in a valve core cavity on the left side of the oil duct;
The valve core cavity at the left side of the oil duct is composed of a front cavity and a tail cavity which are in butt joint, the inner diameter of the front cavity is smaller than that of the tail cavity, a step is formed at the joint of the front cavity and the tail cavity, an annular retainer ring is arranged at the middle part of a valve core in the tail cavity, and a spring is sleeved on the valve core between the annular retainer ring and the step;
an annular groove is formed in the valve core in the front cavity, and the annular groove is positioned between the second rubber sealing ring and the spring;
the front end edge of the valve core is of a round corner structure;
the periphery of the opening end part of the closed groove positioned on the side wall of the runner is a round corner structure;
The valve core is provided with two annular grooves which are arranged at intervals, and the first rubber sealing ring and the second rubber sealing ring are respectively positioned in the corresponding annular grooves;
The tail cap is in threaded connection with the tail cavity;
The two flow passages and the two valve cores are symmetrically arranged in the valve body;
A middle throttling cavity is arranged between the two flow passages, the middle throttling cavity is arranged in the middle of the valve body, the closed grooves at the end parts of the two flow passages in the valve body are communicated with the middle throttling cavity, and the flow passages at the two sides of the valve body are communicated through the two closed grooves; the middle throttle cavity is internally provided with a push rod, the opening end part of the middle throttle cavity positioned on the side wall of the valve body is provided with a connecting tail cap, the connecting tail cap is in threaded connection with the middle throttle cavity, the push rod penetrates through the connecting tail cap and is in threaded connection with the connecting tail cap, the closed end of the middle throttle cavity in the direction far away from the opening end part of the middle throttle cavity forms a closed groove in the valve body, and the end part of the push rod positioned in the valve body can be inserted into the closed groove;
The sealing rubber ring is arranged on the push rod in the middle throttling cavity, the edge of the end part of the push rod in the valve body is a round angle, and the edge of the opening end of the closed groove is a round angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029599.1A CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711029599.1A CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107956902A CN107956902A (en) | 2018-04-24 |
| CN107956902B true CN107956902B (en) | 2024-05-03 |
Family
ID=61964171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711029599.1A Active CN107956902B (en) | 2017-10-27 | 2017-10-27 | Throttle valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107956902B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019217389A1 (en) * | 2018-05-07 | 2019-11-14 | Dayco IP Holding, LLC | Two-position gate and sprung gate valves having a full-flow open position and a restricted-flow open position |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2392423A (en) * | 1942-11-09 | 1946-01-08 | Hydraulic Control Engineering | Hydraulic control system |
| GB1415989A (en) * | 1973-05-31 | 1975-12-03 | Int Harvester Co | Valve spools |
| CN2234535Y (en) * | 1995-02-21 | 1996-09-04 | 陈志坚 | Piston type shunt valve |
| CN1435577A (en) * | 2002-01-31 | 2003-08-13 | Dbt自动化有限公司 | Pilot-actuated valve |
| CN2660262Y (en) * | 2003-07-23 | 2004-12-01 | 上海华岛液压设备制造有限公司 | Overlapping two-way/one-way throttle |
| CN201297401Y (en) * | 2008-11-25 | 2009-08-26 | 姚香怡 | A piston valve |
| CN201687790U (en) * | 2010-05-25 | 2010-12-29 | 上海立新液压有限公司 | Superimposed flow valve |
| CN203614482U (en) * | 2013-10-14 | 2014-05-28 | 宁波明启液压机械有限公司 | Stacked bidirectional-unidirectional throttling valve |
| CN203770281U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | Throttle valve |
| CN203770756U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | One-way throttle valve |
| CN207470849U (en) * | 2017-10-27 | 2018-06-08 | 江西省唯欣高科精密五金有限公司 | Throttle valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10010877C1 (en) * | 2000-02-29 | 2001-03-22 | Mannesmann Ag | Multi-way valve for pneumatic system has 2 axially displaced valve sliders and common vent chamber positioned centrally relative to valve sliders |
-
2017
- 2017-10-27 CN CN201711029599.1A patent/CN107956902B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2392423A (en) * | 1942-11-09 | 1946-01-08 | Hydraulic Control Engineering | Hydraulic control system |
| GB1415989A (en) * | 1973-05-31 | 1975-12-03 | Int Harvester Co | Valve spools |
| CN2234535Y (en) * | 1995-02-21 | 1996-09-04 | 陈志坚 | Piston type shunt valve |
| CN1435577A (en) * | 2002-01-31 | 2003-08-13 | Dbt自动化有限公司 | Pilot-actuated valve |
| CN2660262Y (en) * | 2003-07-23 | 2004-12-01 | 上海华岛液压设备制造有限公司 | Overlapping two-way/one-way throttle |
| CN201297401Y (en) * | 2008-11-25 | 2009-08-26 | 姚香怡 | A piston valve |
| CN201687790U (en) * | 2010-05-25 | 2010-12-29 | 上海立新液压有限公司 | Superimposed flow valve |
| CN203614482U (en) * | 2013-10-14 | 2014-05-28 | 宁波明启液压机械有限公司 | Stacked bidirectional-unidirectional throttling valve |
| CN203770281U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | Throttle valve |
| CN203770756U (en) * | 2014-04-18 | 2014-08-13 | 宁波市镇海华力液压机电有限公司 | One-way throttle valve |
| CN207470849U (en) * | 2017-10-27 | 2018-06-08 | 江西省唯欣高科精密五金有限公司 | Throttle valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107956902A (en) | 2018-04-24 |
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Country or region after: China Address after: 343200 Anfu county of Ji'an province Jiangxi City Industrial Park Applicant after: JIANGXI WEIXIN HI-TECH OIL PRESSURE POLYTRON TECHNOLOGIES Inc. Address before: 343200 Anfu county of Ji'an province Jiangxi City Industrial Park Applicant before: JIANGXI PROVINCE WEIXIN GAOKE PRECISE HARDWARE CO.,LTD. Country or region before: China |
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