CN110307347A - A kind of high sealing pressure reducing valve - Google Patents
A kind of high sealing pressure reducing valve Download PDFInfo
- Publication number
- CN110307347A CN110307347A CN201910653141.6A CN201910653141A CN110307347A CN 110307347 A CN110307347 A CN 110307347A CN 201910653141 A CN201910653141 A CN 201910653141A CN 110307347 A CN110307347 A CN 110307347A
- Authority
- CN
- China
- Prior art keywords
- valve
- flap
- sealing shroud
- sealing
- guide sleeve
- 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.)
- Granted
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Classifications
-
- 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
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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
- 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
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
- Control Of Fluid Pressure (AREA)
- Lift Valve (AREA)
Abstract
The invention discloses a kind of high sealing pressure reducing valves, including valve body, valve deck and flap component, it is characterized by: being equipped with guide sleeve in plunger shaft, flap component can move up and down in setting guide sleeve to be cooperated with valve base sealing, and flexible adjustment part is equipped between flap component and valve deck；Sealing shroud is equipped between guide sleeve and piston cavity wall, sealing shroud can move up and down setting, and resetting structure is equipped between sealing shroud and piston cavity wall, it seals and forms upper annular chamber between set upper side and piston cavity wall and guide sleeve, flap component is equipped with the flap inner cavity for penetrating through upper annular chamber and plunger shaft, and it is intracavitary equipped with pressure regulator valve in flap, guide sleeve lower end and sealing shroud, lower annular chamber is formed between flap component and valve seat, valve body is equipped with valve seat and is connected to down annular chamber and extraneous lower escape orifice, lower escape orifice is equipped with opening and closing element, opening and closing element and the transmission of sealing shroud lower end cooperate, the return port of connection outlet passage and plunger shaft is additionally provided on valve body.Safety and stability of the present invention, good seal performance.
Description
Technical field
The present invention relates to the improvement in medical applications field invention more particularly to a kind of improvement of high sealing pressure reducing valve inventions.
Background technique
When in use, high-pressure medium is depressurized into low-pressure medium via pressure reducing valve, then leads to process pipe use, works as process duct
When road suspends, then the pressure medium in pressure reducing valve exit will continue to increase, and when pressure medium is increased to certain value, pressure reducing valve
Valve clack sealing surface be in contact with sealing surface of seat, since the seal pressure between valve clack sealing surface and sealing surface of seat is smaller,
Leakproofness is poor, and the medium of pressure reducing valve inlet side can also leak into pressure reducing valve outlet side, and pressure reducing valve outlet-side media pressure will continue to
It increases, the accidents such as the pipeline breaking of pressure reducing valve outlet side or explosion easy to form.
Summary of the invention
It is a kind of structurally reasonable, safe steady the technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide
Fixed high sealing pressure reducing valve.
In order to solve the above-mentioned technical problem, the present invention adopts the following technical scheme that realize: this kind of high sealing decompression
Valve, including valve body, valve deck and flap component, are equipped with water inlet flow channel, outlet passage and plunger shaft in the valve body, water inlet flow channel with
Outlet passage is connected by recirculation hole, and recirculation hole is equipped with valve seat, and the valve deck lid is located at valve body upper end, it is characterised in that: institute
It states and is equipped with guide sleeve in plunger shaft, the flap component can move up and down in setting guide sleeve to be cooperated with valve base sealing, and flap
Flexible adjustment part is equipped between component and valve deck, the flap component includes valve petal body, is equipped with flap inner cavity, valve in valve petal body
Valve body be equipped with perforation flap inner cavity go out diversion pipe and be connected to flap inner cavity and plunger shaft into deflector hole, it is intracavitary in flap to set
There are lateral adjustments set, pallet and mandril, preloading spring is set between lateral adjustments set and pallet, is equipped on the outside of pallet
Non-return flap, mandril one end are fixed on flap intracavity sidewall, and the mandril other end passes through the movement that lateral adjustments are placed on non-return flap
On path, pallet and non-return flap are worked in into deflector hole between deflector hole out；Between the guide sleeve and piston cavity wall
Equipped with sealing shroud, sealing shroud can move up and down setting, and resetting structure is equipped between sealing shroud and piston cavity wall, on sealing shroud
Upper annular chamber is formed between end and piston cavity wall and guide sleeve, upper annular chamber is communicated with deflector hole, and upper diversion pipe can be upper and lower
Movement is set in deflector hole, and lower annular chamber, valve are formed between the guide sleeve lower end and sealing shroud, flap component and valve seat
Body is equipped with valve seat is connected to down annular chamber and extraneous lower escape orifice, and lower escape orifice is equipped with opening and closing element, opening and closing element and sealing
Lower end transmission cooperation is covered, the return port of connection outlet passage and plunger shaft is additionally provided on the valve body.
The flexible adjustment part is adjustment spring, and adjusting rod is equipped on the valve deck, is equipped with valve on the outside of adjusting rod upper end
Cap, bonnet are connected on valve deck, and adjusting rod lower end is equipped with spring base, and the adjusting bullet is arranged between spring base and flap component
Spring.
The resetting structure is return spring, and return spring upper end is connected in sealing set upper side peripheral outer lips, return bullet
Spring lower end is connected on the step of piston cavity wall.
The opening and closing element includes transverse slat and compressed spring, and transverse slat is equipped with through-hole, and transverse slat is horizontally moveable to be arranged in valve
On body and valve seat, the compressed spring is set, and it is recessed that the corresponding valve body in transverse slat outer end is equipped with annular between transverse slat inner end and valve seat
Slot, the sealing shroud lower end, which can move up and down, to be protruded into the annular groove, and sealing shroud lower end and transverse slat outer end are equipped with and match
The driving inclined-plane of conjunction.
The sealing shroud lower end and annular groove sealing cooperate.
The beneficial effects of the invention are as follows improved high sealing pressure reducing valve, structurally reasonable, safety and stability, good seal performance,
It realizes especially by such as under type, when the pressure rise of pressure reducing valve outlet-side media is to certain value, enters via into deflector hole
The medium of flap inner cavity pushes pallet and non-return flap to be moved to the left together, and mandril opens non-return flap, and the medium of flap inner cavity is logical
Deflector hole is crossed out into upper annular chamber and sealing shroud is pushed to move down, sealing shroud lower end surface and bottom portion of groove are formed and sealed, sealing shroud
Lower end pushes transverse slat to move to right, and the medium in lower annular sleeve is discharged by lower escape orifice, and flap component is upward by outlet-side media
Active force reduce, seal pressure between valve clack sealing surface and sealing surface of seat increases, leakproofness enhancing；Simultaneously sealing shroud with
Second sealing is formed between bottom portion of groove, and there is dual-seal；Even if there is Jie between sealing surface of seat and valve clack sealing surface
Matter leakage can also be discharged via lower annular chamber and lower escape orifice, will not enter pressure reducing valve outlet side.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 is the structural schematic diagram of closed state of the present invention.
Fig. 2 is the structural schematic diagram of open state of the present invention.
Fig. 3 is the structural schematic diagram of flap component of the present invention.
Specific embodiment
Attached drawing illustrates structure of the invention, further illustrates it in relation to details in conjunction with attached drawing below.Referring to 1 He of attached drawing
Attached drawing 2, the high sealing pressure reducing valve, including valve body 1, valve deck 9 and flap component 2, the valve body 1 is interior to be equipped with water inlet flow channel 29, goes out
Water flow passage 30 and plunger shaft 13, water inlet flow channel 29 are connected with outlet passage 30 by recirculation hole 31, and recirculation hole is equipped with valve seat 15,
The lid of valve deck 9 is located at 1 upper end of valve body, is equipped with guide sleeve 3 in the plunger shaft 13, the flap component 2, which can move up and down, to be set
It sets in guide sleeve 3 and cooperates with the sealing of valve seat 15, and be equipped with flexible adjustment part, the flexible adjustment between flap component 2 and valve deck 9
Part is adjustment spring 8, and adjusting rod 11 is equipped on the valve deck 9, bonnet 10 is equipped on the outside of 11 upper end of adjusting rod, bonnet 10 connects
On valve deck 9,11 lower end of adjusting rod is equipped with spring base 12, and the adjustment spring 8 is arranged between spring base 12 and flap component 2,
Corresponding flap component upper end is equipped with the boss of positioning adjustment spring；Referring to attached drawing 3, the flap component 2 includes valve petal body
20, valve petal body 20 is interior to be equipped with flap inner cavity 21, and valve petal body 20 is equipped with diversion pipe 23 and the communicating valve out of perforation flap inner cavity 21
With plunger shaft 13 into deflector hole 22, flap inner cavity 21 is interior to be equipped with lateral adjustments set 25, pallet 27 and mandril 24 for valve inner cavity 21,
Lateral adjustments set 25 is distributed with pallet 27 or so, and preloading spring 26 is arranged between lateral adjustments set 25 and pallet 27, adjusts
Be equipped with non-return flap 28 on the outside of valve 27, i.e., non-return flap 28 may be reversed centre bore of the setting on the right side of pallet 27, pallet by
Non-return flap controls on-off, and 24 one end of mandril is fixed on 21 side wall of flap inner cavity, and 24 other end of mandril passes through lateral adjustments set 25
It is placed in the movement routine of non-return flap 28, and the end of mandril 24 is placed in preloading spring 26, by mandril 24 when non-return flap 28 moves to left
It opens, pallet 27 and non-return flap 28 are worked in into deflector hole 22 between deflector hole 7 out；The guide sleeve 3 and plunger shaft 13
Sealing shroud 4 is equipped between inner wall, sealing shroud 4 can move up and down setting, and be equipped with and reset between 13 inner wall of sealing shroud 4 and plunger shaft
Structure, the resetting structure are return spring 5, and 5 upper end of return spring is connected in 4 upper end peripheral outer lips of sealing shroud, return bullet
5 lower end of spring is connected on the step of 13 inner wall of plunger shaft, is formed between 4 upper end of sealing shroud and 13 inner wall of plunger shaft and guide sleeve 3
Upper annular chamber 6, upper annular chamber 6 are communicated with deflector hole, and upper diversion pipe can move up and down sealing shroud 4 and be located in deflector hole, institute
It states and forms lower annular chamber 19 between 3 lower end of guide sleeve and sealing shroud 4, flap component 2 and valve seat 15, set on valve body 1 and valve seat 15
Have and be connected to lower annular chamber 19 and extraneous lower escape orifice 16, lower escape orifice 16 is equipped with opening and closing element 17, opening and closing element 17 and sealing shroud 4
Lower end transmission cooperates, and the return port 14 of connection outlet passage and plunger shaft 13 is additionally provided on the valve body 1；
The opening and closing element 17 includes transverse slat and compressed spring, and transverse slat is equipped with through-hole, and transverse slat is horizontally moveable to be arranged in valve body 1
On valve seat 15, the compressed spring is set, the corresponding valve body 1 in transverse slat outer end is equipped with annular between transverse slat inner end and valve seat 15
Groove 18,4 lower end of sealing shroud, which can move up and down, to be protruded into the annular groove 18, and on 4 lower end of sealing shroud and transverse slat outer end
Equipped with the driving inclined-plane matched, and 4 lower end of the sealing shroud and the sealing of annular groove 18 cooperate.
The working principle of the invention, in normal use, pressure reducing valve inlet side high-pressure medium pushes flap component 2 to move up,
Medium is flowed out from pressure reducing valve outlet side, and section port side medium enters plunger shaft 13 by return port 14, and by into water conservancy diversion
Hole 22 enters flap inner cavity 21, the pressure medium of the pressure medium in plunger shaft 13 and flap inner cavity 21 and pressure reducing valve outlet side
It is consistent, when outlet-side media pressure is greater than pre-set value, the distance between valve clack sealing surface and 15 sealing surface of valve seat subtract
Small, i.e., pressure reducing valve opens high reduction, and pressure reducing valve inlet side medium flows to outlet-side media reduction, pressure reducing valve outlet side and plunger shaft 13
Interior pressure medium reduces, and flap component 2 is reduced by downward active force, and flap component 2 moves up again.It adjusted at this
Cheng Zhong, when pressure reducing valve outlet-side media pressure reaches a pre-set value, flap component 2 is by active force up and down
Equally big, flap position keeps stablizing.And when process pipe pause, then the pressure medium of pressure reducing valve outlet side will continue to rise
Height, and pressure medium is more than pre-set value, when being increased to certain value, valve clack sealing surface contacts 15 sealing surface of valve seat, while valve
Medium in valve inner cavity 21 pushes pallet 27 and non-return flap 28 to be moved to the left together, and mandril 24 opens non-return flap 28, in flap
The medium of chamber 21 is by going out diversion pipe 23, going out deflector hole 7 into upper annular chamber 6 and sealing shroud 4 being pushed to move down, 4 lower end of sealing shroud
Face and bottom portion of groove, which are formed, to be sealed, and 4 lower end of sealing shroud pushes transverse slat to move to right, and the through-hole on transverse slat is connected to lower escape orifice 16,
Medium in lower annular sleeve is discharged by lower escape orifice 16, the active force upward by pressure reducing valve inlet side medium of flap component 2
Reduce, the seal pressure between 15 sealing surface of valve clack sealing surface and valve seat increases, leakproofness enhancing；Simultaneously 4 lower end of sealing shroud with
Second sealing is formed between bottom portion of groove, and there is dual-seal；Even if having between 15 sealing surface of valve seat and valve clack sealing surface
Media leaks can also be discharged via lower annular chamber 19 and lower escape orifice 16, will not enter pressure reducing valve outlet side.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (5)
1. a kind of high sealing pressure reducing valve, including valve body, valve deck and flap component, the valve body is interior to be equipped with water inlet flow channel, goes out water flow
Road and plunger shaft, water inlet flow channel are connected with outlet passage by recirculation hole, and recirculation hole is equipped with valve seat, and the valve deck lid is located at valve
Body upper end, it is characterised in that: be equipped with guide sleeve in the plunger shaft, the flap component can move up and down in setting guide sleeve with
Valve base sealing cooperation, and flexible adjustment part is equipped between flap component and valve deck, the flap component includes valve petal body, flap
Be equipped with flap inner cavity in vivo, valve petal body be equipped with perforation flap inner cavity go out diversion pipe and be connected to flap inner cavity and plunger shaft into
Deflector hole, intracavitary in flap to be equipped with lateral adjustments set, pallet and mandril, setting pre-tightens bullet between lateral adjustments set and pallet
Spring, pallet outside are equipped with non-return flap, and mandril one end is fixed on flap intracavity sidewall, and the mandril other end passes through lateral adjustments
It is placed in the movement routine of non-return flap, pallet and non-return flap are worked in into deflector hole between deflector hole out；The guiding
Sealing shroud is equipped between set and piston cavity wall, sealing shroud can move up and down setting, and set between sealing shroud and piston cavity wall
There is resetting structure, seals and form upper annular chamber between set upper side and piston cavity wall and guide sleeve, upper annular chamber, which is communicated with, leads
Discharge orifice, upper diversion pipe can be moved up and down and be set in deflector hole, the guide sleeve lower end and sealing shroud, flap component and valve seat
Between form lower annular chamber, valve body is equipped with the lower escape orifice for be connected to down annular chamber with the external world with valve seat, and lower escape orifice is equipped with
Opening and closing element, opening and closing element and the transmission of sealing shroud lower end cooperate, and the reflux of connection outlet passage and plunger shaft is additionally provided on the valve body
Hole.
2. high sealing pressure reducing valve as described in claim 1, it is characterised in that: the flexible adjustment part is adjustment spring, described
It is equipped with adjusting rod on valve deck, is equipped with bonnet on the outside of adjusting rod upper end, bonnet is connected on valve deck, and adjusting rod lower end is equipped with spring
Seat, is arranged the adjustment spring between spring base and flap component.
3. high sealing pressure reducing valve as described in claim 1, it is characterised in that: the resetting structure is return spring, return bullet
Spring upper end is connected in sealing set upper side peripheral outer lips, and return spring lower end is connected on the step of piston cavity wall.
4. high sealing pressure reducing valve as described in claim 1, it is characterised in that: the opening and closing element includes transverse slat and compression bullet
Spring, transverse slat are equipped with through-hole, and the horizontally moveable setting of transverse slat is on valve body and valve seat, between transverse slat inner end and valve seat described in setting
Compressed spring, the corresponding valve body in transverse slat outer end are equipped with annular groove, and the sealing shroud lower end, which can move up and down, protrudes into the annular
In groove, and sealing shroud lower end is equipped with the driving inclined-plane matched with transverse slat outer end.
5. high sealing pressure reducing valve as claimed in claim 4, it is characterised in that: match with annular groove sealing the sealing shroud lower end
It closes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910653141.6A CN110307347B (en) | 2019-07-19 | 2019-07-19 | High-sealing pressure reducing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910653141.6A CN110307347B (en) | 2019-07-19 | 2019-07-19 | High-sealing pressure reducing valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110307347A true CN110307347A (en) | 2019-10-08 |
| CN110307347B CN110307347B (en) | 2020-10-09 |
Family
ID=68080273
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910653141.6A Active CN110307347B (en) | 2019-07-19 | 2019-07-19 | High-sealing pressure reducing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110307347B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111288192A (en) * | 2020-04-10 | 2020-06-16 | 蓝晶晶 | Pilot operated safety valve |
| CN112943994A (en) * | 2021-03-05 | 2021-06-11 | 星河动力(北京)空间科技有限公司 | Self-feedback adjusting type pressure reducing valve |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080073605A1 (en) * | 2006-09-25 | 2008-03-27 | Denso Corporation | Fluid-controlled valve |
| CN101907189A (en) * | 2009-06-02 | 2010-12-08 | 上海冠龙阀门机械有限公司 | Spring directly driven reducing valve |
| WO2018066197A1 (en) * | 2016-10-06 | 2018-04-12 | 株式会社ケーヒン | Pressure reducing valve for gas |
| CN108953714A (en) * | 2018-08-03 | 2018-12-07 | 宁波杰克龙精工有限公司 | A kind of rely on oneself controls the structure of the normally opened decompression of low pressure |
| CN209041686U (en) * | 2018-10-19 | 2019-06-28 | 远大阀门集团有限公司 | A kind of piston type branch pipe pressure-reducing valve |
-
2019
- 2019-07-19 CN CN201910653141.6A patent/CN110307347B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080073605A1 (en) * | 2006-09-25 | 2008-03-27 | Denso Corporation | Fluid-controlled valve |
| CN101907189A (en) * | 2009-06-02 | 2010-12-08 | 上海冠龙阀门机械有限公司 | Spring directly driven reducing valve |
| WO2018066197A1 (en) * | 2016-10-06 | 2018-04-12 | 株式会社ケーヒン | Pressure reducing valve for gas |
| CN108953714A (en) * | 2018-08-03 | 2018-12-07 | 宁波杰克龙精工有限公司 | A kind of rely on oneself controls the structure of the normally opened decompression of low pressure |
| CN209041686U (en) * | 2018-10-19 | 2019-06-28 | 远大阀门集团有限公司 | A kind of piston type branch pipe pressure-reducing valve |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111288192A (en) * | 2020-04-10 | 2020-06-16 | 蓝晶晶 | Pilot operated safety valve |
| CN111288192B (en) * | 2020-04-10 | 2021-08-24 | 杭州普昌科技有限公司 | Pilot operated safety valve |
| CN112943994A (en) * | 2021-03-05 | 2021-06-11 | 星河动力(北京)空间科技有限公司 | Self-feedback adjusting type pressure reducing valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110307347B (en) | 2020-10-09 |
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Effective date of registration: 20230529 Address after: 053100 No. 6, Weiqi street, chuangxingang South District, Zaoqiang County, Hengshui City, Hebei Province Patentee after: HEBEI OUYINUO GAS EQUIPMENT Co.,Ltd. Address before: No.63, Maidao North Road, Maidao village, Oubei street, Yongjia County, Wenzhou City, Zhejiang Province Patentee before: Yongjia Qida Intellectual Property Consulting Co.,Ltd. |