CN107246480A - A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure - Google Patents
A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure Download PDFInfo
- Publication number
- CN107246480A CN107246480A CN201710008018.XA CN201710008018A CN107246480A CN 107246480 A CN107246480 A CN 107246480A CN 201710008018 A CN201710008018 A CN 201710008018A CN 107246480 A CN107246480 A CN 107246480A
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- Prior art keywords
- blade
- proof
- rotary shaft
- valve
- fire
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 claims abstract description 38
- 238000012856 packing Methods 0.000 claims abstract description 11
- 238000005452 bending Methods 0.000 claims abstract description 9
- 239000012634 fragment Substances 0.000 claims abstract description 6
- 238000003780 insertion Methods 0.000 claims abstract description 6
- 230000037431 insertion Effects 0.000 claims abstract description 6
- 239000007787 solid Substances 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 230000002265 prevention Effects 0.000 description 3
- 239000005060 rubber Substances 0.000 description 3
- 239000000741 silica gel Substances 0.000 description 3
- 229910002027 silica gel Inorganic materials 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 235000019504 cigarettes Nutrition 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002341 toxic gas Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000013536 elastomeric material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000002365 multiple layer Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
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
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
- F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve member
-
- 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
- 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
- F16K27/0218—Butterfly valves
Abstract
The present invention relates to a kind of fire-proof smoke-proof air-valve, specifically related to a kind of fire-proof smoke-proof air-valve for optimizing structure, including framework, cylinder and fastener, lower portion is provided with rotary shaft, blade is fixed with by insertion assembly in rotary shaft, it is connected between blade by fastener, frame outer surface is bolted a cylinder, blade surface in each rotary shaft is provided with sealing device, sealing device includes the elastic sealing element and blade bending part being fixed on blade, blade in two close rotary shafts has three kinds of elastic packing modes, one kind is in a blade surface fixing band angle shell fragment, another is to fix elastic sheet in a blade surface, last one kind is to fix U-shaped thin slice in a blade surface, three kinds of elastic packing modes can be also taken to be simultaneously used on two close blades simultaneously, improve sealing effectiveness.
Description
Technical field
The present invention relates to a kind of fire-proof smoke-proof air-valve, and in particular to a kind of low leakage fire-proof smoke-proof air-valve of optimization structure.
Background technology
The fire-proof smoke-proof air-valve of current market, its concrete scheme is the steel and iron manufacturing of rotating vane fire resisting, and blade
Overlapping part uses band elastic force stalloy, and yielding absorption closing, improves sealing effectiveness, the overlapping position of each blade during sealing
Put and select several points to bend in symmetrical fashion, so bend, can coincide, be formed in many places during closing（More than one）It is multiple curved
Bent sealing surface, is improved from structure, so as to play double sealing effect, central vane is bent with appropriate angle, designs phase
Corresponding angled rotary shaft so that preferably coincide when blade and rotary shaft installation；Also central vane is processed into four directions
Shape, redesigns corresponding square rotary shaft so that blade and rotary shaft are more closely fixed, now in original power base
On plinth, when square rotary shaft drives the angled joint face of blade to pass on more accurately power, fire prevention is improved from structure
The function of Smoke prevention air-valve；Generally, the effect of fire-proof smoke-proof air-valve is to prevent flare from spreading while cutting off poisonous when fire occurs
Gas and cigarette, i.e., with reference to fire resisting damper and a kind of air-valve of smoke damper, still, installed the company of exhaust blower fire-proof smoke-proof wind in the past
Valve is located at what is installed in exhaust equipment, and has used relatively light, corrosion resistant aluminium.
According to the regulation for installing exhaust equipment, aluminum appliance can be used.So such as Fig. 1, fire-proof smoke-proof air-valve（101）
Aluminium is used.And the blade sealed when closing（140）Between lap used synthetic resin rubber, silica gel etc. seal
Close material（160）, but use the fire-proof smoke-proof air-valve of aluminium（101）Fusing point be 660 DEG C, easily melted when fire occurs,
And it is poor as the fire resistance of the synthetic resin, rubber, silica gel of closed material, so above material is unsuitable for.
Abroad, the production standard of fire-proof wind-proof cigarette air-valve be can fire generation after 1.5 ~ 3 hours or 3 hours with
Upper normal work.
Want to reach that above standard must use more than 1400 DEG C of steel and iron of fusing point；In the past, produced anti-with iron
Fiery Smoke prevention air-valve（101）Framework（110）And blade（140）But without closed material（160）Or use synthetic resin（Plastics）, rubber
Glue, silica gel etc..Closed material（160）, the former substantially reduces closure, and the latter produces toxic gas because of easy burn-out and spread,
In addition, driving blade in original fire-proof smoke-proof valve（140）Rotary shaft（150）It is cylinder, with blade（140）Connecting portion
It is circular arc, is welded to each other and is fixedly connected, and, blast that now blade bear and welding relevant with by the voltage of rotary shaft
It is firmly relevant with the height of voltage, it can so cause air-valve cracky, also have, rotary shaft（150）Connected between blade loosely,
The blade centered on rotary shaft is rocked, causes rotary power to decline, gap is also generated between blade.
The content of the invention
For above-mentioned problem, the present invention provides a kind of low leakage fire-proof smoke-proof air-valve for optimizing structure.
The low leakage fire-proof smoke-proof air-valve of the optimization structure of the present invention, including framework, cylinder and fastener, are characterized by frame
Frame is internally provided with rotary shaft, rotary shaft to be fixed between blade, blade by insertion assembly to be connected by fastener, frame
The blade surface that frame outer surface is bolted in a cylinder, each rotary shaft is provided with sealing device, sealing device bag
The blade included in the elastic sealing element being fixed on blade and blade bending part, two close rotary shafts has three kinds of elastic packings
Mode, one kind is that, in a blade surface fixing band angle shell fragment, another is to fix elastic sheet in a blade surface, most
Latter is to fix U-shaped thin slice in a blade surface, while can also take three kinds of elastic packing modes to be simultaneously used in two
On close blade.
Described rotary shaft is square.
The beneficial effects of the invention are as follows：Rotating vane uses the steel and iron manufacturing of fire resisting, and the overlapping part of each blade
Played using the sheet metal of folding and propose elastomeric effect so that during closing, the closing of elastic force chip sorption improves sealing effectiveness,
On each overlapping position of blade, select several points to bend in symmetrical fashion, when so closing, can coincide, be formed in many places（One
Above, it is multiple）Sealing surface is folded, is improved from structure.Double sealing effect is served, central vane is curved with appropriate angle
Song, designs corresponding angled rotary shaft so that preferably coincide when blade and rotary shaft installation, now, original
On dynamic foundation, when the angled fastener of angled rotary shaft drive blade, more accurately power is transmitted, from structure
Improve the work energy of fire-proof smoke-proof air-valve；
Fire-proof smoke-proof air-valve is arranged in multiple blades on the inside of right angle frame when fire occurs, and plays fire resisting by rotation, together
When cut off toxic gas, and the effect discharged fume.When fire occurs in order to improve fire resistance, blade is manufactured using steel, and
And in order to prevent from blade（40）Between gap smoke evacuation, lap between the blades is mounted with the stalloy of elasticity, rises
To raising sealing property；
Elastic steel sheet, blade is adsorbed with steel plate during closing, by the deformation of sheet metal, forms enclosed elastic face（61）Meanwhile, root
According to the shape of lap between blade, many places bending is carried out, is closed in many places, formed and fold sealing surface（62）Improve close
Effect is sealed, the structure of newly-designed fire-proof smoke-proof valve improves sealing effectiveness by dual sealing structure.
Brief description of the drawings
Fig. 1 is structural representation of the invention；
Fig. 2 is structural representation when blade is closed；
Fig. 3 is structural representation when blade is opened；
Fig. 4 is the sectional view of the angular rotary shaft of the present invention；
Fig. 5 is the planimetric sketch of a concrete instance of the elastic packing of the present invention；
Fig. 6 is the planimetric sketch of No. two concrete instances of the elastic packing of the present invention；
Fig. 7 is the planimetric sketch of No. three concrete instances of the elastic packing of the present invention；
Structural representation when Fig. 8 closes for the sealing structure of the present invention；
Structural representation when Fig. 9 opens for the sealing structure of the present invention；
In figure：10 frameworks, 20 cylinders, 30 fasteners, 40 blades, 50 rotary shafts, 60 sealing devices, 61 elastic sealing elements, 62 leaves
Piece bending part, 63 band angle shell fragments, 64 elastic sheets, 65U types thin slice, 70 insertion assemblies.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings.
The low leakage fire-proof smoke-proof air-valve of the optimization structure of the present invention, including framework 10, cylinder 20 and fastener 30, framework
It has been integrally machined in rotary shaft 50, rotary shaft 50 to be fixed between blade 40, blade 40 by insertion assembly 70 inside 10 and has led to
Cross fastener 30 to be connected, the blade surface that the outer surface of framework 10 is bolted in a cylinder 20, each rotary shaft 50 is pacified
Equipped with sealing device 60, sealing device 60 includes the elastic sealing element 61 and blade bending part 62 being fixed on blade 40, close
Two rotary shafts 50 on blade 40 have three kinds of elastic packing modes, one kind is in a surface fixing band angle bullet of blade 40
Piece 63, another is that elastic sheet 64 is fixed on a surface of blade 40, and last one kind is to fix U-shaped on a surface of blade 40
Thin slice 65, while can also take three kinds of elastic packing modes to be simultaneously used on two close blades 40, rotary shaft 50 is side
Shape.
Blade 40 uses steel plate, and in order to prevent gas leakage, the position welding elasticity that blade 40 is folded in gap between blade
Thin slice 64, blade 40 pushes down elastic sheet 64 when closing make the deformation of elastic sheet 64 play sealing process, and blade 40 folds position,
The overlapping part multiple-layer overlapped structure of blade 40 is used again, and double folding during closing plays improvement air leakage effect；Using square
Rotary shaft 50, play fixed blade 40 more firmly, and rotate when can more accurately transmit turning power, play blade 40
Between close closer；Elastic sealing element 61 is in order to prevent leakage between each gap of blade 40, in overlapping part, using flexible
Steel fix, play sealing function using the deformation of elastomeric material when overlapping；The side of elastic sealing element 61 is the flat of blade 40
Face, opposite side uses band angle shell fragment 63 or elastic sheet 64 to be fixed on the excessive internal heat of blade 40 and is fixed on blade using U-shaped thin slice 65
On 40 sides, one of which method is selected to complete elastic sealing structure.
Can be seen when can be seen that sealing according to Fig. 8 and Fig. 9 two blades 40 it is overlapping when, the U-shaped thin slice 65 in side is pushed down
The band angle shell fragment 63 of plane plays sealing function, is recovered again as former state according to elastic properties of materials during opening；Blade bending part 62 is overlapping
Position, it is overlapping to play many places using multiple bending, during closing, improves sealing function.
According to Fig. 4 as can be seen that collapsed shape can be certain angle or circle.
Explanation more than, the present invention uses elastic sealing element 61 and blade bending part 62, and dual-seal during closing rises
To improvement sealing function.
According further to the rotary shaft 50 for fixing blade 40 shown in Fig. 4 and Fig. 1, using quadrangle, make to fix blade 40 more
Firmly, more accurately turning power is transmitted using insertion assembly 70, the anti-leak work(of fire-proof smoke-proof air-valve is improved from structure
Energy.
Claims (2)
1. a kind of low leakage fire-proof smoke-proof air-valve for optimizing structure, including framework, cylinder and fastener, it is characterised in that in framework
Portion is provided with rotary shaft, rotary shaft to be fixed between blade, blade by insertion assembly to be connected by fastener, outside framework
The blade surface that surface is bolted in a cylinder, each rotary shaft is provided with sealing device, and sealing device includes solid
Blade in the elastic sealing element and blade bending part being scheduled on blade, two close rotary shafts has three kinds of elastic packing sides
Formula, one kind is that, in a blade surface fixing band angle shell fragment, another is to fix elastic sheet in a blade surface, finally
One kind is to fix U-shaped thin slice in a blade surface, while can also take three kinds of elastic packing modes to be simultaneously used in two phases
On near blade.
2. a kind of low leakage fire-proof smoke-proof air-valve for optimizing structure as claimed in claim 1, it is characterised in that rotary shaft is side
Shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008018.XA CN107246480A (en) | 2017-01-05 | 2017-01-05 | A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008018.XA CN107246480A (en) | 2017-01-05 | 2017-01-05 | A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107246480A true CN107246480A (en) | 2017-10-13 |
Family
ID=60016398
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710008018.XA Pending CN107246480A (en) | 2017-01-05 | 2017-01-05 | A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107246480A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631081A (en) * | 2017-11-14 | 2018-01-26 | 华荣科技股份有限公司 | A kind of fireproof wind valve |
| CN107631035A (en) * | 2017-10-27 | 2018-01-26 | 江苏易诺威建筑科技有限公司 | A kind of tunnel industrial micro valve |
| CN111089177A (en) * | 2019-12-27 | 2020-05-01 | 河南华鹰机械设备有限公司 | Fire-proof valve |
| CN115405706A (en) * | 2022-08-11 | 2022-11-29 | 扬中市第一蝶阀厂有限公司 | Dust gas butterfly valve, butterfly valve machining equipment and machining method |
| CN107631035B (en) * | 2017-10-27 | 2024-05-03 | 江苏易诺威建筑科技有限公司 | Tunnel industrial valve |
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| US4081173A (en) * | 1976-05-26 | 1978-03-28 | Mccabe Francis J | Rotating blade fire damper |
| CN103883746A (en) * | 2014-04-08 | 2014-06-25 | 南通大通宝富风机有限公司 | High-temperature-resistant and irradiation-resistant air valve with elastic metal pieces |
| CN204420283U (en) * | 2015-01-25 | 2015-06-24 | 南通华纶化纤有限公司 | Small flow type pneumatic blast gate |
| CN204828705U (en) * | 2015-07-30 | 2015-12-02 | 深圳市中航大记工程制品有限公司 | Valve blade seal structure and blast gate |
| CN205013710U (en) * | 2015-09-23 | 2016-02-03 | 郑荣俊 | Stereoplasm blast gate sealing strip |
| CN105736715A (en) * | 2014-12-11 | 2016-07-06 | 重庆郎拓通风设备有限公司 | Fireproof adjustment valve |
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| CN205504012U (en) * | 2016-04-07 | 2016-08-24 | 厦门欣鹭江机械设备有限公司 | Smoke -discharging fireproof valve |
| CN205841791U (en) * | 2016-07-18 | 2016-12-28 | 瑞冬集团有限公司 | Novel fireproof is every cigarette valve |
| CN206478242U (en) * | 2017-01-05 | 2017-09-08 | 金龙岩 | A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure |
-
2017
- 2017-01-05 CN CN201710008018.XA patent/CN107246480A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4081173A (en) * | 1976-05-26 | 1978-03-28 | Mccabe Francis J | Rotating blade fire damper |
| CN103883746A (en) * | 2014-04-08 | 2014-06-25 | 南通大通宝富风机有限公司 | High-temperature-resistant and irradiation-resistant air valve with elastic metal pieces |
| CN105736715A (en) * | 2014-12-11 | 2016-07-06 | 重庆郎拓通风设备有限公司 | Fireproof adjustment valve |
| CN204420283U (en) * | 2015-01-25 | 2015-06-24 | 南通华纶化纤有限公司 | Small flow type pneumatic blast gate |
| CN204828705U (en) * | 2015-07-30 | 2015-12-02 | 深圳市中航大记工程制品有限公司 | Valve blade seal structure and blast gate |
| CN205013710U (en) * | 2015-09-23 | 2016-02-03 | 郑荣俊 | Stereoplasm blast gate sealing strip |
| CN205446842U (en) * | 2016-03-11 | 2016-08-10 | 江苏华东正大空调设备有限公司 | Low hourglass type combination formula fire prevention valve |
| CN205504012U (en) * | 2016-04-07 | 2016-08-24 | 厦门欣鹭江机械设备有限公司 | Smoke -discharging fireproof valve |
| CN205841791U (en) * | 2016-07-18 | 2016-12-28 | 瑞冬集团有限公司 | Novel fireproof is every cigarette valve |
| CN206478242U (en) * | 2017-01-05 | 2017-09-08 | 金龙岩 | A kind of low leakage fire-proof smoke-proof air-valve for optimizing structure |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631035A (en) * | 2017-10-27 | 2018-01-26 | 江苏易诺威建筑科技有限公司 | A kind of tunnel industrial micro valve |
| CN107631035B (en) * | 2017-10-27 | 2024-05-03 | 江苏易诺威建筑科技有限公司 | Tunnel industrial valve |
| CN107631081A (en) * | 2017-11-14 | 2018-01-26 | 华荣科技股份有限公司 | A kind of fireproof wind valve |
| CN111089177A (en) * | 2019-12-27 | 2020-05-01 | 河南华鹰机械设备有限公司 | Fire-proof valve |
| CN111089177B (en) * | 2019-12-27 | 2021-12-14 | 河南华鹰机械设备有限公司 | Fire-proof valve |
| CN115405706A (en) * | 2022-08-11 | 2022-11-29 | 扬中市第一蝶阀厂有限公司 | Dust gas butterfly valve, butterfly valve machining equipment and machining method |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
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Application publication date: 20171013 |