CN106402410B - A kind of fat pipe electromagnetism butterfly valve immediately switched - Google Patents
A kind of fat pipe electromagnetism butterfly valve immediately switched Download PDFInfo
- Publication number
- CN106402410B CN106402410B CN201610867033.5A CN201610867033A CN106402410B CN 106402410 B CN106402410 B CN 106402410B CN 201610867033 A CN201610867033 A CN 201610867033A CN 106402410 B CN106402410 B CN 106402410B
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- China
- Prior art keywords
- flap
- valve
- connecting rod
- magnetic field
- electromagnet
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000000463 material Substances 0.000 claims description 21
- 230000033001 locomotion Effects 0.000 claims description 18
- 230000005389 magnetism Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 230000001681 protective effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 5
- 239000003566 sealing material Substances 0.000 claims description 4
- 239000008187 granular material Substances 0.000 abstract description 3
- 238000011089 mechanical engineering Methods 0.000 abstract description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 8
- 239000011162 core material Substances 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000013618 particulate matter Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- 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
- F16K1/20—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 arranged externally of 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
- F16K1/48—Attaching valve members to screw-spindles
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention belongs to mechanical engineerings and equipment field, disclose a kind of fat pipe electromagnetism butterfly valve immediately switched, including pipe main body, tapered cone interface, flap, flap connecting rod, controller, valve opening operating magnet, stroke electromagnet；The butterfly valve moved by three groups of magnet control flaps, flap and flap connecting rod are provided with permanent magnet, and with aforementioned three electromagnet under the regulation of controller, realize that valve rapidly opens and closes, flap can be opened into the angle close to right angle.Valve opening that the present invention designs, to close the response time extremely short, is quick on the draw, runner is spacious, is properly applied to the places such as the conveying and control of high-end intelligent control place and granular or granular material, has good market application prospect.
Description
Technical field
The invention belongs to mechanical engineering and equipment field, it is related to a kind of switching rapid and easily controllable line check valve
Door.
Background technique
Valve is a kind of extremely important mechanical and industrial part, for different demands, applied to many occasions, wherein electricity
Magnetic check valve is a critically important seed type, and relevant patented technology has more as many as ten thousand kinds.In actual application, currently
There is following general character and disadvantages for some unidirectional valve technologies of electromagnetism.Firstly, most of electromagnetism check valve is to be directed to certain
The control and design of the more elongated spool movement of type, there is always one one more tiny than its inlet and outlet pipeline for this kind of valve
Spool, realizes the open and close of valve by the movement of control valve core, and the elongated spool of such valve and its control mechanism are for normal
For pipeline it is one and suddenly becomes narrow part.If it is for containing larger particles in powder and granule shape material or fluid
The conveying and control of the materials such as object, such valve is easy to block or damage or the biggish material of particulate matter cannot pass through it
Narrow control section, or biggish transporting resistance and the pressure loss are caused, thus it is difficult to use in aforementioned granular or particle
The conveying and control of shape material.
Though the solenoid valve that in addition, there will be is opened, closing motion respectively has feature, often not succinct enough and rapid, usually need
The time for lasting several seconds or tens seconds or more completely could close and open, and automation be required relatively high
Place is often unfavorable.In general, the butterfly valve type with flap, relative to the electromagnetism check valve with spool type
For, channel is more broad and smooth, material by when it is more smooth be not easy to plug, such as application No. is
2012105379689, the related patents technology such as 201220687402X, 2015208311403 on Some principles with ratio of the present invention
It is more close, but its specific embodiment, control process and principle and the present invention are totally different.The invention patent devise it is a kind of open,
Extremely rapid flap type of electromagnetic valve is closed, channel is smooth, and control is simple and direct efficiently, is better than existing similar technique.
Summary of the invention
It is an object of the invention to solve the defect of current prior art and shortcoming, one kind is devised by three groups of electromagnetism
Iron controls the butterfly valve of flap movement, and detailed technical solution is as follows:
A kind of fat pipe electromagnetism butterfly valve immediately switched, including pipe main body, tapered cone interface, flap, flap connect
Bar, controller, valve opening operating magnet, stroke electromagnet；Tapered cone interface is derived inside pipe main body, this connects
Mouth combines closely and realizes the closing of valve with the flap of dome shape；The one side edge of flap passes through hinge one and tapered circular cone
Body interface is connected, and is connect by hinge two with one end of flap connecting rod on another side edge arcuate surface of flap, flap connecting rod
The other end be located in connecting rod protective case, be equipped with stroke electromagnet in connecting rod protective case, connecting rod protective case and sealing material layer
Link position is equipped with valve opening operating magnet, and tapered cone interface is equipped with ring electromagnet, flap and flap connecting rod
Equipped with permanent magnet, under the regulation of controller, the cooperation of two hinges and hinge connecting rod realizes that valve is rapidly opened and closed
It closes.
The tapered cone interface includes ring electromagnet and flap sealing cushioned material layer；Ring electromagnet is located at
Flap seals on the inside of cushioned material layer, and the magnetism and magnetic pole side of the presence or absence of electric current and direction controlling electromagnet are controlled by controller
To, so that movement is controled valve closing, holding by the current strength control valve in control ring electromagnet when flap is closed
Pressure energy power；Outer layer sealing cushioned material layer is made of high molecular material, and outside is combined closely with flap, closes for valve
Buffer function is played in journey, and flap is avoided to smash.
The pole orientation of permanent magnet and the arcuate surface pole orientation of flap are different in the flap connecting rod, and the two is mutually inhaled
Draw, flap is combined at hinge two with flap connecting rod.
When a. executing valve bolt down procedure, under the regulation of controller, ring electromagnet generates the inner concave magnetic with flap
Property different magnetic field, valve opening operating magnet generate with the magnetic identical magnetic field of the arcuate surface of flap, stroke electromagnet
Coil inside generates the magnetic field for forcing flap connecting rod to leave, and realizes that the moment of valve closes；
When b. executing valve opening program, under the regulation of controller, ring electromagnet generates the inner concave magnetic with flap
Property identical magnetic field, valve opening operating magnet generates and the magnetic different magnetic field of the arcuate surface of flap, stroke electromagnetic iron wire
Circle is internal to generate the magnetic field for forcing flap connecting rod to reset, and realizes that the moment of valve opens.
Aforementioned three electromagnet, both ring electromagnet, valve opening operating magnet, stroke electromagnet, in controller
Under control, can with co-operating, so that the valve that designs of the present invention be made to realize the movement of closing, unlatching rapidly, complete to close or
The movement time-consuming that person opens is no more than 0.3 second, and the response time is extremely short, is suitable for some requiring stringent, willing height
Hold intelligent control occasion.
If valve opening operating magnet is smaller or is more posteriorly installed in flap connecting rod protective case sealing material layer, from
And the angle for opening flap is bigger, close to 90 degree of right angle, that is to say, that the valve opening state channel stream that the present invention designs
Freely, almost without obstruction, the pressure loss is not generated substantially, and there is very smooth material handling capacity.
Beneficial effects of the present invention are that there is the fat pipe electromagnetism butterfly valve immediately switched valve to be not easy to block or damage,
Runner is spacious, and control is simple and direct efficiently to open, close rapid feature, can be used for the control of granular, granular material conveying
Occasion.
Detailed description of the invention
Fig. 1 is the cross-sectional view that closed state is presented in valve of the present invention.
Fig. 2 is the cross-sectional view that open state is presented in valve of the present invention.
In figure: 1 hinge one；2 flap movement controllers；3 flap connecting rod protective cases；4 stroke electromagnets；5 sealing material layers；
6 valve opening operating magnets；7 flap connecting rods；8 hinges two；9 flaps；10 flaps seal cushioned material layer；11 annular electromagnetism
Iron；12 pipe main bodies.
Specific embodiment
A specific embodiment of the invention is described in detail below with reference to technical solution of the present invention and attached drawing.
Valve designed by the present invention by tapered cone interface, flap and flap connecting rod, electromagnet and controller and
Valve pipe main body is formed.
Valve pipe one end is the tapered cone interface more smaller than caliber, mainly includes two components, the control of internal layer
The ring electromagnet 11 of valve closing motion, outer layer flap seal cushioned material layer 10.Internal layer ring electromagnet 11 is by controller 2
It is controlled, the magnetism and pole orientation of the presence or absence of electric current and direction controlling electromagnet can be passed through.Outer layer seals cushioned material layer
10 are made of high molecular material, and effect is combined closely with flap 9, and leakage will not be generated by closing valve, and be closed in valve
Buffer function is played in the process, flap will not be made to smash.
Flap 9 is in dome shape, can be combined closely with the sealing cushioned material layer 10 of tapered cone interface outer layer, by
Permanent magnet material is made, and with permanent magnetism and constant pole orientation, and has enough intensity will not be because of valve opening, pass
Close movement and it is broken.There are two hinges on flap 9, combine, are cutting with scissors at the one of tapered cone interface at hinge 1
It being combined at chain 28 with flap connecting rod 7, hinge 28 is located at 9 arcuate surface of the flap one side edge position opposite with hinge 1, and two
Closing and the breakdown action of flap may be implemented in the cooperation of a hinge and hinge connecting rod.There is another permanent magnet in flap connecting rod 7
The core material of material, in 28 junction of hinge, the direction of 7 magnetic pole of the flap connecting rod centainly direction phase with 9 arcuate surface magnetic pole of flap
Different, here, the two attracts each other, and absolutely not excludes each other.
Ring electromagnet 11 is in the internal layer of tapered cone interface, and magnetism is controlled with pole orientation by controller 2
System.When executing valve bolt down procedure, the pole orientation of 11 outer layer of ring electromagnet is different with 9 inner concave pole orientation of flap,
It attracts each other, promotion flap 9 is combined closely with tapered cone interface.When executing valve opening program, annular electromagnetism
The pole orientation of 11 outer layer of iron is identical as 9 inner concave pole orientation of flap, i.e., mutually flicks, and flap 9 is forced to leave tapered circular cone
Body interface.
The movement and effect of valve opening operating magnet 6 just act on ring electromagnet 11 opposite.It is closed when executing valve
When closing program, the pole orientation of valve opening operating magnet 6 is identical as 9 arcuate surface pole orientation of flap, i.e., mutually exclusive, compels
Flap 9 is set to leave electromagnet 6.When executing valve opening program, the pole orientation and flap 9 of valve opening operating magnet 6
Arcuate surface pole orientation is different, that is, attracts each other, and flap 9 is kept to hang up, and makes valve that open state be presented.
The movement of the control flap connecting rod 7 of stroke electromagnet 4.When executing valve bolt down procedure, in 4 coil of stroke electromagnet
Generate the magnetic field opposite with the 7 inner permanent magnetic core magnetic line of force of flap connecting rod, i.e., it is mutually exclusive, force flap connecting rod 7 to leave valve immediately
The position of valve connecting rod protective case 3 pushes flap 9 to move to the position that tapered cone interface combines, valve is forced to be closed.When
When executing valve opening program, magnetic identical with the 7 inner permanent magnetic core magnetic line of force of flap connecting rod is generated in 4 coil of stroke electromagnet
, that is, it attracts each other, flap connecting rod 7 is forced to reset immediately, the position inside flap connecting rod protective case 3 is returned to, to make valve
It is in the open state.
Aforementioned three electromagnet, both annular electromagnetism 11, valve opening operating magnet 6, stroke electromagnet 4, in controller 2
Control under, can be with co-operating.When executing valve bolt down procedure, under the regulation of controller 2, annular electromagnetism 11 generate with
The magnetic different magnetic field of 9 inner concave of flap, valve opening operating magnet 6 generate the identical magnetic field with 9 arcuate surface of flap magnetism,
4 coil inside of stroke electromagnet generates the magnetic field for forcing flap connecting rod 7 to leave, then under the synergy of preceding factors, realizes
The moment of valve closes.When executing valve opening program, situation is just the opposite, under the regulation of controller 2, annular electromagnetism 11
It generates identical magnetic field, valve opening operating magnet 6 with 9 inner concave of flap magnetism and generates different with 9 arcuate surface magnetism of flap
Magnetic field, 4 coil inside of stroke electromagnet generate force flap connecting rod 7 reset magnetic field, then in the synergy of preceding factors
Under, realize that the moment of valve opens.
The valve that the present invention designs can realize rapidly the movement of closing, unlatching, complete the movement consumption closed or opened
When be no more than 0.3 second, the response time is extremely short, be suitable for it is some require stringent, willing high-end intelligent control occasion,
And there is very spacious valve handling capacity, market-oriented application prospect is good, is suitable for wide popularization and application.
Runner is rather spacious when the valve opening state that the present invention designs, and has certain two-way handling capacity, but reflects
It may retain in the position that tapered cone interface is connected with valve pipe main body through object, or generate certain resistance,
The valve that the present invention designs can be used as one-way cock use, positive to refer to what tapered cone interface bore reduced by direction
Direction, reversed intransitable function are in closed state by controller control valve door.
Claims (10)
1. the fat pipe electromagnetism butterfly valve that one kind immediately switchs, which is characterized in that connect including pipe main body (12), tapered cone
Mouth, flap (9), flap connecting rod (7), controller (2), valve opening operating magnet (6), stroke electromagnet (4)；Pipe main body
(12) tapered cone interface is internally extended, the pass of valve is combined closely and realized to the flap (9) of the interface and dome shape
It closes；The one side edge of flap (9) is connected by hinge one (1) with tapered cone interface, outside another side edge of flap (9)
It is connect by hinge two (8) with one end of flap connecting rod (7) on convex surface, the other end of flap connecting rod (7) is located at connecting rod protective case
(3) in, stroke electromagnet (4) are equipped in connecting rod protective case, connecting rod protective case (3) and the connection position of sealing material layer (5) install
Have valve opening operating magnet (6), tapered cone interface is equipped with ring electromagnet (11), flap (9) and flap connecting rod
(7) it is equipped with permanent magnet and realizes the opening and closing of valve under the regulation of controller (2).
2. the fat pipe electromagnetism butterfly valve that one kind according to claim 1 immediately switchs, which is characterized in that the tapered circle
Cone interface includes ring electromagnet (11) and flap sealing cushioned material layer (10)；Ring electromagnet (11) is located at flap sealing
On the inside of cushioned material layer (10), movement is controled valve closing by controller (2)；Outer layer seals cushioned material layer (10) by high score
Sub- material is made, and outside is combined closely with flap (9), for playing buffer function in valve closing process, flap is avoided to beat
It is broken.
3. the fat pipe electromagnetism butterfly valve that one kind according to claim 1 or 2 immediately switchs, which is characterized in that the valve
The pole orientation of valve connecting rod (7) interior permanent magnet is different with the arcuate surface pole orientation of flap (9), and the two attracts each other, flap (9)
It is combined at hinge two (8) with flap connecting rod (7).
4. the fat pipe electromagnetism butterfly valve that one kind according to claim 1 or 2 immediately switchs, which is characterized in that when valve is in
When open state, position is formed by angle not less than 80 degree when flap (9) is located at closed state with it.
5. the fat pipe electromagnetism butterfly valve that one kind according to claim 3 immediately switchs, which is characterized in that when valve is in unlatching
When state, position is formed by angle not less than 80 degree when flap (9) is located at closed state with it.
6. the fat pipe electromagnetism butterfly valve that one kind described according to claim 1 or 2 or 5 immediately switchs, which is characterized in that the valve
The movement time-consuming that door is completed to close or be opened is no more than 0.3 second.
7. the fat pipe electromagnetism butterfly valve that one kind according to claim 3 immediately switchs, which is characterized in that the valve is completed
The movement time-consuming closed or opened is no more than 0.3 second.
8. the fat pipe electromagnetism butterfly valve that one kind according to claim 4 immediately switchs, which is characterized in that the valve is completed
The movement time-consuming closed or opened is no more than 0.3 second.
9. the fat pipe electromagnetism butterfly valve that one kind described according to claim 1 or 2 or 5 or 7 or 8 immediately switchs, which is characterized in that
The closing, opening program are as follows:
When a. executing valve bolt down procedure, under the regulation of controller (2), ring electromagnet (11) generates interior with flap (9)
The magnetic different magnetic field in concave surface, valve opening operating magnet (6) generate the identical magnetic field with the arcuate surface of flap (9) magnetism,
The coil inside of stroke electromagnet (4) generates the magnetic field for forcing flap connecting rod (7) to leave, and realizes that the moment of valve closes；
When b. executing valve opening program, under the regulation of controller (2), ring electromagnet (11) generates interior with flap (9)
The magnetic identical magnetic field in concave surface, valve opening operating magnet (6) generate the magnetic field different with the arcuate surface of flap (9) magnetism,
Stroke electromagnet (4) coil inside generates the magnetic field for forcing flap connecting rod (7) to reset, and realizes that the moment of valve opens.
10. the fat pipe electromagnetism butterfly valve that one kind according to claim 3 immediately switchs, which is characterized in that the closing,
Opening program is as follows:
When a. executing valve bolt down procedure, under the regulation of controller (2), ring electromagnet (11) generates interior with flap (9)
The magnetic different magnetic field in concave surface, valve opening operating magnet (6) generate the identical magnetic field with the arcuate surface of flap (9) magnetism,
The coil inside of stroke electromagnet (4) generates the magnetic field for forcing flap connecting rod (7) to leave, and realizes that the moment of valve closes；
When b. executing valve opening program, under the regulation of controller (2), ring electromagnet (11) generates interior with flap (9)
The magnetic identical magnetic field in concave surface, valve opening operating magnet (6) generate the magnetic field different with the arcuate surface of flap (9) magnetism,
Stroke electromagnet (4) coil inside generates the magnetic field for forcing flap connecting rod (7) to reset, and realizes that the moment of valve opens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867033.5A CN106402410B (en) | 2016-09-30 | 2016-09-30 | A kind of fat pipe electromagnetism butterfly valve immediately switched |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610867033.5A CN106402410B (en) | 2016-09-30 | 2016-09-30 | A kind of fat pipe electromagnetism butterfly valve immediately switched |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106402410A CN106402410A (en) | 2017-02-15 |
| CN106402410B true CN106402410B (en) | 2018-12-18 |
Family
ID=59228947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610867033.5A Active CN106402410B (en) | 2016-09-30 | 2016-09-30 | A kind of fat pipe electromagnetism butterfly valve immediately switched |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106402410B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893926A (en) * | 1994-09-27 | 1996-04-12 | Yamatake Honeywell Co Ltd | On-off valve |
| CN102966769A (en) * | 2012-12-13 | 2013-03-13 | 云南省电子工业研究所 | Direct one-way non-return solenoid valve |
| CN204187056U (en) * | 2014-09-30 | 2015-03-04 | 江南阀门有限公司 | Turbine high-pressure admission safety check |
| CN205207793U (en) * | 2015-10-26 | 2016-05-04 | 德阳九鼎智远知识产权运营有限公司 | One -way automatic valve |
-
2016
- 2016-09-30 CN CN201610867033.5A patent/CN106402410B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0893926A (en) * | 1994-09-27 | 1996-04-12 | Yamatake Honeywell Co Ltd | On-off valve |
| CN102966769A (en) * | 2012-12-13 | 2013-03-13 | 云南省电子工业研究所 | Direct one-way non-return solenoid valve |
| CN204187056U (en) * | 2014-09-30 | 2015-03-04 | 江南阀门有限公司 | Turbine high-pressure admission safety check |
| CN205207793U (en) * | 2015-10-26 | 2016-05-04 | 德阳九鼎智远知识产权运营有限公司 | One -way automatic valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106402410A (en) | 2017-02-15 |
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