CN113280163B - Valve inside of explosion-proof tyre - Google Patents
Valve inside of explosion-proof tyre Download PDFInfo
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- CN113280163B CN113280163B CN202110418743.0A CN202110418743A CN113280163B CN 113280163 B CN113280163 B CN 113280163B CN 202110418743 A CN202110418743 A CN 202110418743A CN 113280163 B CN113280163 B CN 113280163B
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- core
- pressure relief
- sealing
- section
- sealing gasket
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- 238000007789 sealing Methods 0.000 claims abstract description 94
- 238000009434 installation Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
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
- F16K15/00—Check valves
- F16K15/20—Check valves specially designed for inflatable bodies, e.g. tyres
- F16K15/207—Check valves specially designed for inflatable bodies, e.g. tyres and combined with other valves, e.g. safety valves
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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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/04—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded
- F16K17/048—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side spring-loaded combined with other safety valves, or with pressure control devices
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/164—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side and remaining closed after return of the normal pressure
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0254—Construction of housing; Use of materials therefor of lift valves with conical shaped valve members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Safety Valves (AREA)
Abstract
The invention discloses an explosion-proof tire valve core, which comprises a core rod, wherein a sealing section is arranged on the core rod, a pressure relief channel is arranged in the sealing section, and the sealing section comprises a first core section; the first core section is provided with an inner cavity, one end of the inner cavity is opened, a plug is fixed at the opening of the first core section, and the plug and the inner wall of the first core section are sealed through a pressure relief sealing gasket; a bracket is arranged in the inner cavity of the first core section, a pressure relief spring is arranged between the bracket and the top wall of the inner cavity of the first core section, the pressure relief spring applies bias force to the bracket to enable the bracket to be in contact with a pressure relief sealing gasket to close a pressure relief channel, and when the internal pressure of the tire exceeds a threshold value, the bracket is separated from the pressure relief sealing gasket to open the pressure relief channel; the invention can avoid the phenomenon that the pressure can not be released due to the adhesion of the sealing gasket caused by the rise of the air temperature in the tire, ensure the normal opening of the pressure release channel, avoid the phenomenon of tire burst caused by the failure of normal pressure release and improve the driving safety of the vehicle.
Description
The application claims application number 2021200494473, the patent name of which is the priority of the utility model patent application of the anti-explosion tire valve core.
Technical Field
The invention relates to an explosion-proof tire valve inside, and belongs to the technical field of tire inflation.
Background
The tire inner tube is used as a main component for guaranteeing the safety of vehicles, and the requirements on the sealing performance and the performance state of the valve core are higher and higher. Due to the relationship between the road environment and the temperature change, the vehicle tire is prone to tire burst caused by increased pressure, and the tire burst is very dangerous in the case of high-speed running.
In order to solve the technical problem of tire burst, the tire burst-proof valve inside is invented in the industry, and the tire burst caused by overhigh tire pressure is prevented by adding a pressure relief structure, but the phenomenon that pressure cannot be relieved easily occurs in the actual use process. For example, CN200920029444.2 is a chinese patent, the inner seal gasket is sleeved on the core rod, the first spring seat abuts against the inner seal gasket under the action of the first pressure regulating spring, and the valve core will cause the phenomenon that the seal gasket is adhered and cannot release pressure due to the temperature rise in the tire.
In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.
Disclosure of Invention
The invention aims to solve the technical problems, and provides an explosion-proof tire valve inside which can avoid the phenomenon that a sealing gasket is adhered to release pressure due to the rise of air temperature in a tire, ensure the normal opening of a pressure release channel, avoid the phenomenon of tire burst due to the failure of normal pressure release, and improve the driving safety of a vehicle.
In order to solve the technical problems, the invention adopts the following technical scheme: the explosion-proof tire valve core comprises a core rod, wherein a sealing section is arranged on the core rod, a pressure relief channel is arranged in the sealing section, and the sealing section comprises a first core section; the first core section is provided with an inner cavity, one end of the inner cavity is opened, a plug is fixed at the opening of the first core section, and the plug and the inner wall of the first core section are sealed through a pressure relief sealing gasket;
the pressure relief device is characterized in that a support seat is arranged in the inner cavity of the first core section, a pressure relief spring is arranged between the support seat and the top wall of the inner cavity of the first core section, and the pressure relief spring applies a biasing force to the support seat to enable the support seat to be in contact with a pressure relief sealing gasket to close a pressure relief channel.
Further, a gap is formed between the bracket and the inner wall of the first core section;
one end of the bracket is provided with an installation part, and the other end of the bracket is provided with a sealing part; one end of the pressure relief spring is sleeved on the mounting part; the other end of the pressure relief spring is abutted to the top wall of the inner cavity of the first core section.
The core rod penetrates through the core body and the core cap, and an inflation channel is formed among the core rod, the core body and the core cap;
one end of the pressure relief channel is positioned in the core body cavity and communicated with the inflation channel.
Furthermore, a groove is formed in the sealing part and used for accommodating the end part of the plug; the bottom of the sealing part is an arc surface, and the top of the pressure relief sealing gasket is a plane; under the action of the pressure relief spring, the arc surface at the bottom of the sealing part is abutted against the plane at the top of the pressure relief sealing gasket.
Furthermore, a through hole is formed in the plug, and when pressure is relieved, the through hole is communicated with the pressure relief channel;
the plug is in interference fit with the inner cavity wall of the first core section or in threaded connection with the inner cavity wall of the first core section.
Furthermore, the sealing section also comprises a second core section and a third core section which are sequentially connected with the first core section; the outer diameter of the second core segment is smaller than the outer diameters of the third core segment and the first core segment; and the periphery of the second core section is sleeved with an inflatable sealing gasket.
Further, the pressure relief channel comprises an axial channel and a radial channel, the radial channel is arranged on the third core section, and the radial channel is multi-channel.
Furthermore, an installation groove is formed in the plug, and the pressure relief sealing gasket is arranged in the installation groove;
the inner wall of the first core section is provided with a step, one end of the pressure relief sealing gasket is abutted to the step, and the width K of the contact surface of the pressure relief sealing gasket and the step is 0.1-0.5mm.
Furthermore, one end of the core rod is provided with a limiting part, a sealing spring is sleeved on the core rod, two ends of the sealing spring are respectively abutted against the limiting part and the core cap of the core rod, and the sealing spring applies a biasing force to the core rod to enable the inflatable sealing gasket to be abutted against and pressed on the core body to realize sealing.
Further, the mounting part is a convex column.
After the technical scheme is adopted, compared with the prior art, the invention has the following advantages:
the position of the pressure relief sealing gasket is fixed, and the bracket can move axially, so that the phenomenon that the pressure relief cannot be carried out due to the fact that the sealing gasket is adhered due to the rise of the air temperature of the tire is avoided.
The pressure relief spring and the sealing spring are independent, so that the difference between the pressure relief pressure and the closing pressure can be greatly reduced, the difference between the pressure relief pressure and the closing pressure can be reduced to be within 0.1MPa, and the difference between the pressure relief pressure and the closing pressure of the core of the common explosion-proof valve is 0.2-0.5MPa.
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is another schematic structural view of the present invention;
FIG. 3 is an enlarged view of the portion A in FIG. 2 (the arrow indicates the direction of air flow in the pressure relief state);
in the figure, the position of the first and second end faces,
1-core cap, 2-core body, 3-sealing ring, 4-sealing spring, 5-core rod, 51-pressure relief channel, 52-third core section, 53-second core section, 54-first core section, 6-inflatable sealing gasket, 7-bracket, 8-pressure relief sealing gasket, 9-pressure relief spring and 10-plug.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Example 1
As shown in figures 1-3, the invention provides a valve core of a run-flat tire, which comprises a core cap 1, a core body 2 and a core rod 5, wherein the core cap 1 is arranged at one end of the core body 2, the core rod 5 penetrates through the core body 2 and the core cap 1, and an inflation channel is formed between the core rod 5 and the core body 2 as well as between the core rod 5 and the core cap 1.
The core rod 5 comprises a sealing section, a pressure relief channel 51 is arranged in the sealing section, and one end of the pressure relief channel 51 is positioned in the cavity of the core body 2 and is communicated with the inflation channel. The sealing section comprises a third core section 52, a second core section 53 and a first core section 54 which are connected in sequence, the outer diameter of the second core section 53 is smaller than that of the third core section 52, and the outer diameter of the first core section 54 is larger than that of the second core section 53; the periphery of the second core section 53 is sleeved with an inflatable sealing gasket 6.
One end of the core rod 5 is provided with a limiting part, a sealing spring 4 is sleeved on the core rod 5, two ends of the sealing spring 4 are respectively abutted against the limiting part of the core rod 5 and the core cap 1, and the sealing spring 4 applies bias force to the core rod 5 to enable the inflatable sealing gasket 6 to be abutted against the core body 2 to achieve sealing effect.
The end, far away from the inflatable sealing gasket 6, of the first core section 54 is provided with an opening, a plug 10 is fixed at the opening of the first core section 54, a through hole is formed in the plug 10, and during pressure relief, the through hole is communicated with the pressure relief channel 51.
The periphery of the plug 10 is fixed with a pressure relief sealing gasket 8, and the pressure relief sealing gasket 8 is preferably in close contact with the inner wall of the first core section 54 to play a sealing role.
A pressure relief spring 9 and a bracket 7 are arranged in the inner cavity of the first core section 54, a gap is formed between the bracket 7 and the inner wall of the first core section 54, the bracket 7 can move along the axial direction of the core rod 5, and the gap between the bracket 7 and the inner wall of the first core section 54 is a part of the pressure relief channel 51; one end of the pressure relief spring 9 is abutted against the top wall of the inner cavity of the first core section 54, and the other end of the pressure relief spring is abutted against the bracket 7; the pressure relief spring 9 exerts a biasing force on the bracket 7 such that the bracket 7 presses against the pressure relief gasket 8 to effect a sealing action.
Preferably, the pressure relief channel 51 includes an axial channel and a radial channel, the radial channel is formed on the third core segment 52, and the number of the radial channels may be multiple.
Preferably, one end of the bracket 7 is a mounting part, and the other end is a sealing part; the mounting part is a convex column, and one end of the pressure relief spring 9 is sleeved on the convex column; the sealing part is provided with a groove which is used for accommodating the end part of the plug 10; the sealing portion bottom is the arc surface, and 8 tops of pressure release sealing gasket are the plane, and sealing portion bottom arc surface and 8 top plane butts of pressure release sealing gasket under the effect of pressure release spring 9 can become the face contact gradually by line contact between the two to guarantee the leakproofness.
Preferably, an installation groove is formed in the plug 10, the pressure relief sealing gasket 8 is arranged in the installation groove, a step is arranged on the inner wall of the first core section 54, one end of the pressure relief sealing gasket 8 is abutted to the step, the width K of the contact surface between the pressure relief sealing gasket 8 and the step is 0.1-0.5mm, and the plug 10 tightly presses the pressure relief sealing gasket 8 between the installation groove and the step, so that the sealing performance is ensured, and the product has stable exhaust pressure.
Preferably, the plug 10 is an interference fit with the inner cavity wall of the first core section 54, or is threaded.
The valve inside is installed in the nozzle body, a sealing ring 3 is arranged outside the core body 2, and the valve inside and the inner wall of the nozzle body are sealed through the sealing ring 3.
The principle of the invention is as follows:
and (3) an inflation process: under the action of external force, the inflatable sealing gasket 6 is separated from the core body, the inflatable channel is opened, and after inflation is finished, the inflatable sealing gasket 6 is abutted against the core body 2 to realize sealing under the action of the tire internal pressure and the sealing spring 4.
And (3) pressure relief process: when the internal pressure of the tire exceeds a preset threshold value, the bracket 7 moves by overcoming the elasticity of the pressure relief spring 9 under the action of the internal pressure, the bracket 7 is separated from the pressure relief sealing gasket 8, the gas in the tire is discharged through the through hole of the plug 10 and the pressure relief channel 51 until the internal pressure reaches a preset value, and the bracket 7 is abutted against the pressure relief sealing gasket 8 under the action of the pressure relief spring 9 to realize sealing.
The pressure relief sealing gasket is fixed in position, and the bracket can move axially, so that the phenomenon that the pressure cannot be relieved due to adhesion of the sealing gasket caused by the rise of the air temperature of the tire is avoided.
The pressure relief spring and the sealing spring are independent, so that the difference between the pressure relief pressure and the closing pressure can be greatly reduced, the difference between the pressure relief pressure and the closing pressure can be reduced to be within 0.1MPa, and the difference between the pressure relief pressure and the closing pressure of the core of the common explosion-proof valve is 0.2-0.5MPa.
The foregoing is illustrative of the best mode of the invention and details not described herein are within the common general knowledge of a person of ordinary skill in the art. The protection scope of the present invention is subject to the content of the claims, and any equivalent changes based on the technical teaching of the present invention are also within the protection scope of the present invention.
Claims (7)
1. The utility model provides an explosion-proof tire valve inside, includes core bar (5), be equipped with the seal segment on core bar (5), the inside pressure release passageway (51) that is equipped with of seal segment, its characterized in that: the seal segment comprises a first core segment (54); the first core section (54) is provided with an inner cavity, one end of the inner cavity is opened, a plug (10) is fixed at the opening of the first core section (54), and the plug (10) and the inner wall of the first core section (54) are sealed through a pressure relief sealing gasket (8);
a bracket (7) is arranged in an inner cavity of the first core section (54), a pressure relief spring (9) is arranged between the bracket (7) and the top wall of the inner cavity of the first core section (54), the pressure relief spring (9) exerts a bias force on the bracket (7) to enable the bracket (7) to be in contact with a pressure relief sealing gasket (8) to close a pressure relief channel (51), and when the internal pressure of the tire exceeds a threshold value, the bracket (7) is separated from the pressure relief sealing gasket (8) to be in contact with the pressure relief sealing gasket (8) to open the pressure relief channel (51);
an installation groove is formed in the plug (10), and the pressure relief sealing gasket (8) is arranged in the installation groove;
a gap is arranged between the bracket (7) and the inner wall of the first core section (54);
one end of the bracket (7) is an installation part, and the other end of the bracket is a sealing part; one end of the pressure relief spring (9) is sleeved on the mounting part; the other end of the pressure relief spring (9) is abutted against the top wall of the inner cavity of the first core section (54);
the sealing part is provided with a groove, and the groove is used for accommodating the end part of the plug (10); the bottom of the sealing part is an arc surface, and the top of the pressure relief sealing gasket (8) is a plane; under the action of the pressure relief spring (9), the arc surface at the bottom of the sealing part is abutted against the plane at the top of the pressure relief sealing gasket (8);
a through hole is formed in the plug (10), and when pressure is relieved, the through hole is communicated with the pressure relief channel (51);
the plug (10) is in interference fit or threaded connection with the inner cavity wall of the first core section (54).
2. A run flat valve core as defined in claim 1, wherein: the core rod structure is characterized by further comprising a core body (2) and a core cap (2), wherein the core cap (1) is installed at one end of the core body (2), the core rod (5) penetrates through the core body (2) and the core cap (1), and an inflation channel is formed among the core rod (5), the core body (2) and the core cap (1);
one end of the pressure relief channel (51) is positioned in the cavity of the core body (2) and is communicated with the inflation channel.
3. A run flat valve core as defined in claim 1, wherein: the sealing section also comprises a second core section (53) and a third core section (52) which are sequentially connected with the first core section (54); the outer diameter of the second core section (53) is smaller than the outer diameters of the third core section (52) and the first core section (54); and an inflatable sealing gasket (6) is sleeved on the periphery of the second core section (53).
4. A run flat valve core according to claim 3, wherein: the pressure relief channel (51) comprises an axial channel and a radial channel, the radial channel is arranged on the third core section (52), and the radial channel is multi-channel.
5. A run flat valve core as defined in claim 1, wherein: the inner wall of the first core section (54) is provided with a step, one end of the pressure relief sealing gasket (8) is abutted to the step, and the width K of the pressure relief sealing gasket (8) and the contact surface of the step is 0.1-0.5mm.
6. A run flat valve core according to claim 3, wherein: one end of the core rod (5) is provided with a limiting part, a sealing spring (4) is sleeved on the core rod (5), two ends of the sealing spring (4) are respectively abutted against the limiting part of the core rod (5) and the core cap (1), and the sealing spring (4) applies bias force to the core rod (5) to enable the inflatable sealing gasket (6) to be abutted against the core body (2) to realize sealing.
7. A run flat valve core as defined in claim 1, wherein: the installation part is a convex column.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2021200494473 | 2021-01-09 | ||
| CN202120049447 | 2021-01-09 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113280163A CN113280163A (en) | 2021-08-20 |
| CN113280163B true CN113280163B (en) | 2023-03-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110418743.0A Active CN113280163B (en) | 2021-01-09 | 2021-04-19 | Valve inside of explosion-proof tyre |
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| Country | Link |
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| CN (1) | CN113280163B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114776851B (en) * | 2022-04-17 | 2023-04-07 | 西安航空学院 | Self-closed pressure release valve for liquid storage system |
| CN117128346B (en) * | 2023-10-26 | 2024-02-23 | 高密同创气门芯有限公司 | Explosion-proof valve inside |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002104143A (en) * | 2000-09-28 | 2002-04-10 | Asahi Sangyo Kk | Inflation air chuck of tire valve |
| CN2483218Y (en) * | 2001-04-28 | 2002-03-27 | 於九富 | Alarm device for burst-proof inner tube valve of automobile |
| CN201443631U (en) * | 2009-07-13 | 2010-04-28 | 高密市同创汽车配件有限公司 | Anti-burst valve core |
| CN201973296U (en) * | 2011-03-16 | 2011-09-14 | 北京布莱迪仪器仪表有限公司 | Rescue chamber oxygen control system and pressure reducer thereof |
| CN204437313U (en) * | 2015-02-13 | 2015-07-01 | 四川生多凯机械设备制造有限公司 | Automobile air conditioning system Split type valve core |
| CN107228215B (en) * | 2017-07-28 | 2019-08-20 | 北京航天发射技术研究所 | A kind of soft-sealing safety valve |
| CN112066049A (en) * | 2020-09-30 | 2020-12-11 | 高密同创气门芯有限公司 | Valve inside of explosion-proof tyre |
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2021
- 2021-04-19 CN CN202110418743.0A patent/CN113280163B/en active Active
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| CN113280163A (en) | 2021-08-20 |
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Address after: 261500 no.1908, Fenghuang Street (West), Liquan street, Gaomi City, Weifang City, Shandong Province Patentee after: Shandong Tongchuang Precision Technology Co.,Ltd. Country or region after: China Address before: 261500 no.1908, Fenghuang Street (West), Liquan street, Gaomi City, Weifang City, Shandong Province Patentee before: GAOMI TONGCHUANG VALVE CORE Co.,Ltd. Country or region before: China |