CN102734248A - Overflow valve - Google Patents
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- CN102734248A CN102734248A CN2012102489507A CN201210248950A CN102734248A CN 102734248 A CN102734248 A CN 102734248A CN 2012102489507 A CN2012102489507 A CN 2012102489507A CN 201210248950 A CN201210248950 A CN 201210248950A CN 102734248 A CN102734248 A CN 102734248A
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- valve
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- main valve
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Abstract
The invention discloses an overflow valve comprising a valve body, a main valve seat, a main valve core, a pilot valve seat, a pilot valve core, a main valve spring, a pilot valve spring, a pilot valve seat installation hole and a pilot valve seat limit part, wherein the main valve seat is fixedly sleeved in the valve body, and the pilot valve seat is movably sleeved in the pilot valve seat installation hole and is provided with a pilot valve oil inlet; and the pilot valve seat limit part is used for limiting the motion range of the pilot valve seat, so that the motion stroke of the pilot valve seat is shorter than that of the pilot valve core. Compared with the prior art, with the adoption of the overflow valve, abrasion of the pilot valve core and the pilot valve seat is small, and the pre-pressure of the pilot valve spring is small, so that the using reliability of the overflow valve can be greatly improved, and the service life of the overflow valve can be greatly prolonged.
Description
Technical field
The present invention relates to the valve body structure field, relate to a kind of relief valve in particular, it has the characteristics of reliability height and long service life.
Background technique
Relief valve generally is applied in the hydraulic equipment, and mainly plays level pressure overflow, voltage stabilizing, system unloaded and safety protection.Existing a kind of pilot operated compound relief valve, it all comprises valve body, main valve seat, main valve plug, guide valve seat, guide valve core, main spool spring and pilot valve spring, the pressure oil of active chamber enters into the pilot valve ante-chamber through damping hole; When cracking pressure that working pressure is set greater than pilot valve, then pilot valve is opened, and main valve oil suction chamber hydraulic oil is through throttle orifice, pilot valve oil suction chamber; Through pilot valve overflow oil return, main valve plug overcomes spring force and moves under the pressure difference effect in two ends (fuel-economizing hole), and main valve is opened; The hydraulic oil of main valve chamber is on a small quantity through the pilot valve oil return; Most of through the main valve opened from the spill port oil return,, so realize the function of relief valve.
But, because the pilot valve spring in the above-mentioned existing relief valve is in the state of suppressing all the time, so occur permanent deformation and fatigue damage easily; During relief valve work; Pilot valve is frequent to be opened and closure, and guide valve seat bears the high-frequency rigid impact of guide valve core, and guide valve seat and guide valve core wearing and tearing are big; Reduced the operational safety of pilot valve spring, guide valve seat and guide valve core, thereby reduced the operational safety and the working life of whole relief valve.
In view of this, the inventor has this case to produce to the above-mentioned defective further investigation of existing relief valve then.
Summary of the invention
The object of the present invention is to provide a kind of relief valve, to solve the problem that existing relief valve has poor reliability and lacks working life.
In order to reach above-mentioned purpose, solution of the present invention is:
A kind of relief valve comprises valve body, main valve seat, main valve plug, guide valve seat, guide valve core, main spool spring and pilot valve spring, and this main valve seat fixed cover is located in the valve body; Wherein, This relief valve also comprises guide valve seat mounting hole and guide valve seat limited part; This guide valve seat activity is nested with in the guide valve seat mounting hole; This guide valve seat offers the pilot valve oil inlet hole, and the movable stroke that this guide valve seat limited part is used to limit the sphere of activities of guide valve seat and make guide valve seat is shorter than the movable stroke of guide valve core.
Further; This guide valve seat mounting hole is arranged in the main valve seat; Also be provided with pilot valve oil back chamber, main valve chamber, pilot valve oil back chamber spill port and main valve spill port in this main valve seat, this main valve plug activity is nested with in main valve chamber and with main valve chamber and is divided into main valve oil suction chamber and pilot valve oil suction chamber, offers throttle orifice on this main valve plug; The main valve oil suction chamber is communicated with the pilot valve oil suction chamber through this throttle orifice; This pilot valve oil inlet hole can be communicated with the pilot valve oil back chamber with the pilot valve oil suction chamber, this main spool spring is installed in the main valve chamber, and its two ends lean respectively at the interior edge face of main valve seat and the interior edge face of main valve plug; This pilot valve spring is installed in the pilot valve oil back chamber, and it is replaced and drives this pilot valve oil inlet hole of guide valve core sealing at the guide valve core end face.
Further, this guide valve seat limited part comprises aforementioned gland and is formed on the boss on the guide valve seat, and this boss is positioned at the pilot valve oil back chamber, and this boss can move between the main valve seat interior edge face in gland end face and the pilot valve oil back chamber.
Further, this relief valve also comprises the pressure regulation screw mandrel, also is provided with O-ring seals on this pressure regulation screw mandrel, and this pressure regulation screw mandrel passes gland and stretches in the gland and rely on this pilot valve spring.
Further, the internal diameter in this pilot valve fitting seat hole contacts the internal diameter of port with guide valve core greater than the pilot valve oil inlet hole.
Further, the end of this gland is provided with one and crosses oily port hole, is used to be communicated with gland inner chamber and pilot valve oil back chamber.
Second solution of the present invention is:
A kind of relief valve; Comprising the pilot valve fixed base; This guide valve seat mounting hole is arranged in the pilot valve fixed base; Also be provided with main valve chamber, main valve oil inlet hole, main valve spill port in this main valve seat, this main valve plug activity is nested with in main valve chamber and with main valve chamber and is divided into pilot valve oil back chamber and main valve oil back chamber, offers the annular chamber that can be communicated with or cut off passage between main valve oil inlet hole and the main valve spill port on this main valve plug outer wall; The ladder surface that also offers the throttle orifice that is communicated with pilot valve oil back chamber and main valve oil back chamber and the conflict of fuel feeding liquid on this main valve plug and let main valve plug move; This main spool spring is installed in the main valve chamber, and its two ends lean respectively on gland interior edge face and main valve plug, and this pilot valve spring is installed in the pilot valve oil back chamber and replaces and drives this pilot valve oil inlet hole of guide valve core sealing at the guide valve core end face.
Further, the internal diameter in this pilot valve fitting seat hole contacts the internal diameter of port with guide valve core greater than the pilot valve oil inlet hole.
Further, this guide valve seat limited part comprises and is formed on the flange on the main valve seat and is formed on the boss on the guide valve seat that this boss can be conflicted with this flange and produced spacing.
Further, also be formed with the wedge-shaped part that is used for the ejection of fuel feeding liquid and main valve plug is moved on this main valve plug.
After adopting said structure; The relief valve that the present invention relates to; It is through letting guide valve seat be active state; So when the main valve of relief valve is opening state, this is in, and high frequency is opened, guide valve core and the collision meeting between the guide valve seat in the pilot valve of closed circulation working state convert flexible bump to by the traditional rigid bump, has greatly reduced the impact force between guide valve core and the guide valve seat; And the pilot valve pre-pressure of the spring of this relief valve is little, makes pilot valve spring indefatigability damage.Thus compared with prior art, guide valve core of the present invention and guide valve seat wearing and tearing are little, the infringement of pilot valve spring indefatigability, operational safety and the working life that can improve relief valve greatly.
Description of drawings
Fig. 1 is the structural representation that the present invention relates to a kind of relief valve first embodiment;
Fig. 2 is the topology view that the present invention relates to a kind of relief valve second embodiment.
Among the figure:
Guide valve seat mounting hole 21 pilot valve oil back chambers 22
Pilot valve oil suction chamber 232 main valve oil back chambers 233
Pilot valve oil back chamber spill port 24
Main valve spill port 25 flanges 26
Main valve oil inlet hole 27
Wedge-shaped part 34
Boss 42 pilot valve fixed bases 43
O-ring seals 91.
Embodiment
In order further to explain technological scheme of the present invention, come the present invention is set forth in detail through specific embodiment below.
As shown in Figure 1; It is first embodiment who the present invention relates to a kind of relief valve 100; This relief valve 100 comprises valve body 1, main valve seat 2, main valve plug 3, guide valve seat 4, guide valve core 5, main spool spring 6, pilot valve spring 7 and gland 8; These main valve seat 2 fixed covers are located in the valve body 1, and the structural principle of said structure and traditional pilot operated compound relief valve is basic identical, so do not describe in detail.
Emphasis of the present invention improves and is: this relief valve 100 also comprises guide valve seat mounting hole 21 and guide valve seat limited part; These guide valve seat 4 activities are nested with in guide valve seat mounting hole 21; This guide valve seat 4 offers pilot valve oil inlet hole 41; This guide valve seat limited part is used to limit the sphere of activities of guide valve seat 4, and makes the movable stroke of guide valve seat be shorter than the movable stroke of guide valve core 5.
Like this; The relief valve 100 that the present invention relates to; It is through letting guide valve seat 4 be active state, and so when the main valve of relief valve 100 is opening state, this is in, and high frequency is opened, the guide valve core 5 in the pilot valve of closed circulation working state and the collision between the guide valve seat 4; Can convert flexible bump to by the traditional rigid bump, greatly reduce the impact force between guide valve core 5 and the guide valve seat 4; And the pilot valve spring 7 of this relief valve 100 also need not to bear for a long time too big pressure, makes pilot valve spring 7 indefatigability damage.
Thus compared with prior art, guide valve core 5 of the present invention is little with guide valve seat 4 wearing and tearing, and the pilot valve pre-pressure of the spring is little, can improve the operational safety and the working life of relief valve 100 greatly.
In the present embodiment, as a kind of concrete structure example of this relief valve 100, this guide valve seat mounting hole 21 is arranged in the main valve seat 2; Also be provided with pilot valve oil back chamber 22, main valve chamber 23, pilot valve oil back chamber spill port 24 and main valve spill port 25 in this main valve seat 2; These main valve plug 3 activities are nested with in main valve chamber 23, and main valve chamber 23 is divided into main valve oil suction chamber 231 and pilot valve oil suction chamber 232, offer throttle orifice 31 on this main valve plug 3; Main valve oil suction chamber 231 is communicated with pilot valve oil suction chamber 232 through this throttle orifice 31; This pilot valve oil inlet hole 41 can be communicated with pilot valve oil back chamber 22 with pilot valve oil suction chamber 232, this main spool spring 6 is installed in the main valve chamber 23, and its two ends lean the interior edge face at the interior edge face of main valve seat 2 and main valve plug 3 respectively; This pilot valve spring 7 is installed in and is positioned at gland inner chamber 81; It is replaced at guide valve core 5 end faces and drives guide valve core 5 these pilot valve oil inlet hole 41 ports of sealing, and the end of gland 8 is provided with one and crosses oily port hole 82 simultaneously, is used to be communicated with gland inner chamber 81 and pilot valve oil back chamber 22.Among this embodiment, this guide valve seat limited part comprises gland 8 and is formed on the boss 42 on the guide valve seat 4, and this boss 42 is positioned at pilot valve oil back chamber 22, and this boss 42 can move between main valve seat 2 interior edge faces in gland 8 end faces and the pilot valve oil back chamber 22.
When initial position; This guide valve seat 4 leans on main valve seat 2, and these pilot valve spring 7 precompressions are less, when input pressure reaches and surpasses certain value is; Guide valve seat 4 and guide valve core 5 be together to the left motion and to the spacing point of guide valve seat 4, i.e. the position touched mutually of boss 42 and gland 8; Input pressure continue to raise, and guide valve core 5 can be thrown off pilot valve oil inlet holes 41, and pilot valve is opened, and main valve is opened then, when pilot valve is closed, because guide valve seat 4 can travelling backwards, so can reduces guide valve core 5 greatly and act on the impact force on the guide valve seat 4.
In addition; In order to regulate the initial elastic force of pilot valve spring 7; This relief valve 100 also comprises pressure regulation screw mandrel 9, also is provided with O-ring seals 91 on this pressure regulation screw mandrel 9, and this pressure regulation screw mandrel 9 passes gland 8 and stretches in the gland 8 and rely on this pilot valve spring 7; Through changing the current location of pressure regulation screw mandrel 9, can let the initial spring force of pilot valve spring 7 controlled.
More preferably, the inside diameter D 1 of this pilot valve mounting hole 21 contacts port inside diameter D 2 greater than pilot valve oil inlet hole 41 with guide valve core 5.
Please with reference to shown in Figure 2; It is second embodiment who the present invention relates to a kind of relief valve 100; Present embodiment is identical with first embodiment's main improvement; All be that guide valve seat 4 is set to movable shape, itself and first embodiment's the main distinction is that applied relief valve 100 structures of second embodiment are different; The mode of employing low pressure pressure reduction realizes the unlatching and the closure of main valve; This relief valve 100 also is provided with pilot valve fixed base 43, and this guide valve seat mounting hole 21 is arranged in the pilot valve fixed base 43, also is provided with main valve chamber 23, main valve oil inlet hole 27, main valve spill port 25 in this main valve seat 2; These main valve plug 3 activities are nested with in main valve chamber 23 and with main valve chamber 23 and are divided into pilot valve oil back chamber 22, main valve oil suction chamber 234 and main valve oil back chamber 233; Offer the annular chamber 32 that can be communicated with or cut off passage between main valve oil inlet hole and the main valve spill port on these main valve plug 3 outer walls, also offer the throttle orifice 31 that is communicated with pilot valve oil back chamber and main valve oil back chamber 233 and the conflict of fuel feeding liquid on this main valve plug 3 and the ladder surface 33 that lets main valve plug move, this main spool spring 6 is installed in the main valve chamber 23; Its two ends lean respectively on gland 8 and main valve plug 3, and this pilot valve spring 7 is installed in the pilot valve oil back chamber 22 and replaces and drives guide valve core 5 these pilot valve oil inlet holes 41 of sealing at guide valve core 5 end faces.So, when oil liquid pressure increased, this fluid can promote guide valve seat 4 earlier and move, and when oil liquid pressure continues to increase, can make guide valve seat 4 separate with guide valve core 5, and this fluid gets in the pilot valve oil back chamber 22, flows in the main valve oil back chamber 233 through throttle orifice 31 again.More specifically, can move in order to ensure guide valve seat 4, the inside diameter D 3 in this pilot valve fitting seat hole is greater than the inside diameter D 4 of pilot valve oil inlet hole and guide valve core contacting part port.Move in order to further facilitate main valve plug, also be formed with the wedge-shaped part 34 that is used for the ejection of fuel feeding liquid and main valve plug is moved on this main valve plug 3.
In addition, in a second embodiment, the structure of this guide valve seat limited part is adjustment to some extent also, and it specifically comprises the flange 26 that is formed on the main valve seat 2 and be formed on the boss 42 on the guide valve seat 4 that this boss 42 can be conflicted with this flange 26 and produced spacing.
The foregoing description and graphic and non-limiting product form of the present invention and style, the those of ordinary skill of any affiliated technical field all should be regarded as not breaking away from patent category of the present invention to its suitable variation or modification of doing.
Claims (10)
1. a relief valve comprises valve body, main valve seat, main valve plug, guide valve seat, guide valve core, main spool spring, pilot valve spring and gland, and this main valve seat fixed cover is located in the valve body; It is characterized in that; This relief valve also comprises guide valve seat mounting hole and guide valve seat limited part; This guide valve seat activity is nested with in the guide valve seat mounting hole; This guide valve seat offers the pilot valve oil inlet hole, and the movable stroke that this guide valve seat limited part is used to limit the sphere of activities of guide valve seat and make guide valve seat is shorter than the movable stroke of guide valve core.
2. a kind of relief valve as claimed in claim 1; It is characterized in that this guide valve seat mounting hole is arranged in the main valve seat, also be provided with pilot valve oil back chamber, main valve chamber, pilot valve oil back chamber spill port and main valve spill port in this main valve seat; This main valve plug activity is nested with in main valve chamber and with main valve chamber and is divided into main valve oil suction chamber and pilot valve oil suction chamber; Offer throttle orifice on this main valve plug, the main valve oil suction chamber is communicated with the pilot valve oil suction chamber through this throttle orifice, and this pilot valve oil inlet hole can be communicated with the pilot valve oil back chamber with the pilot valve oil suction chamber; This main spool spring is installed in the main valve chamber; Its two ends lean respectively at the interior edge face of main valve seat and the interior edge face of main valve plug, and this pilot valve spring is installed in the pilot valve oil back chamber, and it is replaced and drives this pilot valve oil inlet hole of guide valve core sealing at the guide valve core end face.
3. a kind of relief valve as claimed in claim 2; It is characterized in that; This guide valve seat limited part comprises aforementioned gland and is formed on the boss on the guide valve seat, and this boss is positioned at the pilot valve oil back chamber, and this boss can move between the main valve seat interior edge face in gland end face and the pilot valve oil back chamber.
4. a kind of relief valve as claimed in claim 3 is characterized in that this relief valve also comprises the pressure regulation screw mandrel, also is provided with O-ring seals on this pressure regulation screw mandrel, and this pressure regulation screw mandrel passes gland and stretches in the gland and rely on this pilot valve spring.
5. like claim 1 or 3 described a kind of relief valves, it is characterized in that the end of gland is provided with one and crosses oily port hole, is used to be communicated with gland inner chamber and pilot valve oil back chamber.
6. a kind of relief valve as claimed in claim 2 is characterized in that, the internal diameter in this pilot valve fitting seat hole contacts the internal diameter of port with guide valve core greater than the pilot valve oil inlet hole.
7. a kind of relief valve as claimed in claim 1; It is characterized in that; Also comprise the pilot valve fixed base; This guide valve seat mounting hole is arranged in the pilot valve fixed base; Also be provided with main valve chamber, main valve oil inlet hole, main valve spill port in this main valve seat, this main valve plug activity is nested with in main valve chamber and with main valve chamber and is divided into pilot valve oil back chamber, main valve oil suction chamber and main valve oil back chamber, offers the annular chamber that can be communicated with or cut off passage between main valve oil inlet hole and the main valve spill port on this main valve plug outer wall; The ladder surface that also offers the throttle orifice that is communicated with pilot valve oil back chamber and main valve oil back chamber and the conflict of fuel feeding liquid on this main valve plug and let main valve plug move; This main spool spring is installed in the main valve chamber, and its two ends lean respectively on gland interior edge face and main valve plug, and this pilot valve spring is installed in the pilot valve oil back chamber and replaces and drives this pilot valve oil inlet hole of guide valve core sealing at the guide valve core end face.
8. a kind of relief valve as claimed in claim 7 is characterized in that, the internal diameter in this pilot valve fitting seat hole contacts the internal diameter of port with guide valve core greater than the pilot valve oil inlet hole.
9. a kind of relief valve as claimed in claim 7 is characterized in that, this guide valve seat limited part comprises and be formed on the flange on the main valve seat and be formed on the boss on the guide valve seat that this boss can be conflicted with this flange and produced spacing.
10. a kind of relief valve as claimed in claim 7 is characterized in that, also is formed with the wedge-shaped part that is used for the ejection of fuel feeding liquid and main valve plug is moved on this main valve plug.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210248950.7A CN102734248B (en) | 2012-07-18 | 2012-07-18 | Overflow valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210248950.7A CN102734248B (en) | 2012-07-18 | 2012-07-18 | Overflow valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102734248A true CN102734248A (en) | 2012-10-17 |
| CN102734248B CN102734248B (en) | 2015-05-27 |
Family
ID=46990331
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210248950.7A Active CN102734248B (en) | 2012-07-18 | 2012-07-18 | Overflow valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102734248B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971959A (en) * | 2016-06-25 | 2016-09-28 | 玉环县现代工具有限公司 | Differential pressure type unloading safety valve |
| CN107100909A (en) * | 2017-05-02 | 2017-08-29 | 西南交通大学 | A kind of intelligent control energy-saving valve |
| CN108005975A (en) * | 2016-10-28 | 2018-05-08 | 上海立新液压有限公司 | A kind of high-efficient simple type sequence valve |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971956B (en) * | 2016-05-31 | 2017-11-10 | 盐城市锦瑞石油机械有限公司 | A kind of pilot-actuated valve |
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| JPH11132347A (en) * | 1997-10-31 | 1999-05-21 | Zexel:Kk | Two stage relief valve |
| KR100499262B1 (en) * | 1999-03-03 | 2005-07-07 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot poppet relief valve |
| CN1231683C (en) * | 2001-12-18 | 2005-12-14 | 沃尔沃建造设备控股（瑞典）有限公司 | Hydraulic safety valve |
| JP2006046404A (en) * | 2004-08-02 | 2006-02-16 | Nachi Fujikoshi Corp | Reducing modular valve with pilot check valve and hydraulic circuit |
| CN1317514C (en) * | 2004-02-12 | 2007-05-23 | 沃尔沃建造设备控股（瑞典）有限公司 | Relief valve |
| CN100347474C (en) * | 2004-02-25 | 2007-11-07 | 沃尔沃建造设备控股（瑞典）有限公司 | Pilot operated relief valve |
| CN100514241C (en) * | 2005-02-11 | 2009-07-15 | Hydac流体技术有限公司 | Valve |
| CN101520102A (en) * | 2008-02-25 | 2009-09-02 | 沃尔沃建造设备控股（瑞典）有限公司 | Relive valve |
| CN201407224Y (en) * | 2009-03-20 | 2010-02-17 | 严光贤 | Overflow valve |
| CN202718940U (en) * | 2012-07-18 | 2013-02-06 | 严光贤 | Overflow valve |
-
2012
- 2012-07-18 CN CN201210248950.7A patent/CN102734248B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11132347A (en) * | 1997-10-31 | 1999-05-21 | Zexel:Kk | Two stage relief valve |
| KR100499262B1 (en) * | 1999-03-03 | 2005-07-07 | 볼보 컨스트럭션 이키프먼트 홀딩 스웨덴 에이비 | Pilot poppet relief valve |
| CN1231683C (en) * | 2001-12-18 | 2005-12-14 | 沃尔沃建造设备控股（瑞典）有限公司 | Hydraulic safety valve |
| CN1317514C (en) * | 2004-02-12 | 2007-05-23 | 沃尔沃建造设备控股（瑞典）有限公司 | Relief valve |
| CN100347474C (en) * | 2004-02-25 | 2007-11-07 | 沃尔沃建造设备控股（瑞典）有限公司 | Pilot operated relief valve |
| JP2006046404A (en) * | 2004-08-02 | 2006-02-16 | Nachi Fujikoshi Corp | Reducing modular valve with pilot check valve and hydraulic circuit |
| CN100514241C (en) * | 2005-02-11 | 2009-07-15 | Hydac流体技术有限公司 | Valve |
| CN101520102A (en) * | 2008-02-25 | 2009-09-02 | 沃尔沃建造设备控股（瑞典）有限公司 | Relive valve |
| CN201407224Y (en) * | 2009-03-20 | 2010-02-17 | 严光贤 | Overflow valve |
| CN202718940U (en) * | 2012-07-18 | 2013-02-06 | 严光贤 | Overflow valve |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105971959A (en) * | 2016-06-25 | 2016-09-28 | 玉环县现代工具有限公司 | Differential pressure type unloading safety valve |
| CN108005975A (en) * | 2016-10-28 | 2018-05-08 | 上海立新液压有限公司 | A kind of high-efficient simple type sequence valve |
| CN107100909A (en) * | 2017-05-02 | 2017-08-29 | 西南交通大学 | A kind of intelligent control energy-saving valve |
| CN107100909B (en) * | 2017-05-02 | 2018-10-30 | 西南交通大学 | A kind of intelligent control energy-saving valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102734248B (en) | 2015-05-27 |
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Effective date of registration: 20180712 Address after: 317000 No. 358, extension Road, Dayang street, Taizhou, Zhejiang. Patentee after: Zhejiang Gaoyu Hydraulic Mechanical and Electrical Co., Ltd. Address before: Room 517 502, Jiayun Garden, Xiamen Xiahe Road, Fujian Province Patentee before: Yan Guangxian |