CN108413084A - A kind of gas check (non-return) valve and exhaust apparatus - Google Patents
A kind of gas check (non-return) valve and exhaust apparatus Download PDFInfo
- Publication number
- CN108413084A CN108413084A CN201810468185.7A CN201810468185A CN108413084A CN 108413084 A CN108413084 A CN 108413084A CN 201810468185 A CN201810468185 A CN 201810468185A CN 108413084 A CN108413084 A CN 108413084A
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- Prior art keywords
- valve
- return
- holder
- gas check
- baffle
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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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/06—Check valves with guided rigid valve members with guided stems
- F16K15/063—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a kind of gas check (non-return) valve and corresponding exhaust apparatus, the gas check (non-return) valve includes shell, holder and baffle, and holder is fixedly arranged on enclosure, and shell is the tubular of both ends open, baffle sliding axially along shell relative to holder, to open and close the gas check (non-return) valve.There is the active force of interaction between baffle and holder, baffle seals the gas check (non-return) valve by the active force.The flowing gas that the present invention can be effectively prevent in gas pipeline opens valve suction, therefore has good non-return effect.Also, structure of the invention is firm, it is smaller to hinder air-flow.
Description
Technical field
The invention belongs to gas valve technical fields.More particularly to a kind of gas check (non-return) valve and corresponding exhaust apparatus.
Background technology
Common building is usually required for divulging information, to keep room air pure and fresh.People set up in building as a result,
There is ventilation shaft.And for house, since kitchen or toilet will produce undesirable cooking fume or foul smell, this is just more
Need special discharge duct that indoor air is discharged, as a result, in kitchen or toilet often equipped with special discharge duct.
For ventilation shaft or discharge duct, it usually needs the gas in pipeline is flowed to a direction.In order to prevent air or
Gas pours in down a chimney, and has occurred some check (non-return) valves for gas pipeline in the prior art.
Fig. 1 is a kind of structural schematic diagram of existing air duct check (non-return) valve.As shown in the figure comprising valve body 100 and non-return leaf
Piece 200, valve body 1100 are equipped with gas passage 110, and non-return blade 200 is movably connected on valve body 100, non-return blade 200
Medial surface is in contact with valve body 100.Check (non-return) valve valve block can be inhaled however, the air duct check (non-return) valve cannot solve the flowing wind in air duct
The problem of opening finally results in check (non-return) valve and loses or partly lose the effect for preventing air or gas from pouring in down a chimney.
Invention content
(1) technical problems to be solved
It is to be solved by this invention that be existing gas check (non-return) valve cannot prevent the flowing gas in gas pipeline can be by valve
Door-inhale is opened, the problem for causing gas non-return effect bad.
(2) technical solution
In order to solve the above technical problems, a kind of gas check (non-return) valve of proposition of the present invention, including shell, holder and baffle, institute
It states holder and is fixedly arranged on enclosure, the shell is the tubular of both ends open, and the baffle is relative to holder along the axial direction of shell
Sliding, to open and close the gas check (non-return) valve.
There is the active force of interaction between the baffle and holder in a preferred embodiment of the invention,
Baffle seals the gas check (non-return) valve by the active force.
A preferred embodiment of the invention, the baffle and the holder offset press contacts position have by
The guide frame that inclined surface is constituted.
A preferred embodiment of the invention, the shell include side wall and from side wall internally raised ring-type
Flange, the baffle close the gas check (non-return) valve by being abutted against with the collar flange of the shell.
A preferred embodiment of the invention is installed with precompressed spring, one end top in the pilot hole
End to guide rod, the side end wall of other end contact pilot hole.
A preferred embodiment of the invention is equipped with the first permanent magnet in the holder, is arranged in the baffle
There are the second permanent magnet and third permanent magnet, second permanent magnet and third permanent magnet are placed in the both sides of the first permanent magnet, and
One permanent magnet and the second permanent magnet are mutually exclusive, and the first permanent magnet and third permanent magnet attract each other.
A preferred embodiment of the invention, first permanent magnet are set to the one of the close baffle of holder
Side, second permanent magnet are set to the side of the close head cover of the guide rod, and the third permanent magnet is set to far
Side from the head cover.
A preferred embodiment of the invention, the holder axially offer pilot hole along the outer shell,
The baffle includes head cover and guide rod, and for the head cover for being abutted against with the collar flange, the guide rod is inserted into institute
It states in pilot hole and is slided relative to the pilot hole.
A preferred embodiment of the invention, the head cover have the streamlined in shape along airflow direction.
A preferred embodiment of the invention, the head cover are umbrella cover shape, and the head cover and the guide rod it
Between be equipped with reinforcing rib.
A preferred embodiment of the invention, the holder include main body and support arm, the support arm with it is described outer
The internal face of shell is fastenedly connected, thus the main body is remained fixed to the inside of the shell, and the pilot hole is formed in this
In main body.
A preferred embodiment of the invention, the holder have the streamlined in shape along airflow direction.
A preferred embodiment of the invention, the main body are olive shape, and the support arm is rolled from center to two
Tiltedly.
In addition, the present invention also propose include above-mentioned gas check (non-return) valve exhaust apparatus.
(3) advantageous effect
The gas check (non-return) valve of the present invention uses magnetic-type self-enclosed principle, the flowing gas that can be effectively prevent in gas pipeline
Body opens valve suction, therefore has good non-return effect.Also, present invention employs guide frame, stabilized structures；Each component
Using streamlined design, it can effectively weaken the inhibition to air-flow so that the flowing of air-flow is more smoothly.
Description of the drawings
Fig. 1 is a kind of structural schematic diagram of existing air duct check (non-return) valve；
Fig. 2A is the sectional view of the gas check (non-return) valve of one embodiment of the present of invention；
Fig. 2 B are the sectional views of the gas check (non-return) valve of the second embodiment of the present invention；
Fig. 3 A are to be allowed to be pressed on the form on holder when air-flow pushes baffle in embodiment shown in Fig. 2A；
Fig. 3 B are to be allowed to be pressed on the form on holder when air-flow pushes baffle in embodiment shown in Fig. 2 B.
Fig. 4 is the partial enlarged view of Fig. 3 A and Fig. 3 B；
Fig. 5 is the structural schematic diagram according to an exhaust apparatus of the embodiment of the present invention.
Specific implementation mode
The present invention proposes a kind of gas check (non-return) valve.The gas check (non-return) valve is a kind of check valve, and is led for the unidirectional of air-flow
It is logical.So-called gas refers to mainly with simple substance existing for gas phase or mixture in the present invention.Both include various elementary gas, also wrap
Various mixed gas, such as air are included, further include the gas containing solid-state or aqueous suspension, such as various flue gases, water vapour
Deng.
The gas check (non-return) valve of the present invention includes shell, holder and baffle, and holder is fixedly arranged on enclosure, and shell is opened for both ends
The tubular of mouth, baffle sliding axially along shell relative to holder.There is the active force of interaction, gear between baffle and holder
Plate seals the check (non-return) valve by the effect.Active force includes attraction and repulsive force, the present invention is not limited to which which kind of active force used,
As long as by the active force so that baffle can be returned to the position of closing valve.
A kind of embodiment is that a precompressed spring is installed in pilot hole, the end of one end contact guide rod, separately
The side end wall of one end contact pilot hole.Since spring acts on the contact of guide rod so that baffle has the fortune far from holder
Dynamic trend, and after reaching certain distance, baffle 3 and the collar flange of shell abut against.
Another embodiment is that the first permanent magnet and the second permanent magnet are respectively set in holder and baffle, and first forever
Magnet and the second permanent magnet are mutually exclusive.Baffle and holder can be respectively equipped with guiding parts, such as guide rod and pilot hole, thus
It can make the opposite sliding of the two.First permanent magnet and the second permanent magnet can be set to any position of holder and plate washer, as long as
The two can generate the power of interaction.
Preferably, holder and baffle all have the streamlined in shape along airflow direction.
It is further illustrated the present invention below by specific embodiment.
Fig. 2A is the sectional view of the gas check (non-return) valve of one embodiment of the present of invention.As shown, the gas check (non-return) valve packet
Include shell 1, holder 2 and baffle 3.Holder 2 and baffle 3 are respectively positioned in shell 1.
Shell 1 has the cylindrical shape of both ends open.Since general pipeline is pipe, shell 1 may generally be
Cylindrical shape.But the present invention is not limited with the cross sectional shape of shell.The space that 1 one side of shell circulates as gas, on the other hand
The structure being also used for inside Zhi Suiqi.According to different applications, the material of shell 1 can be different, either the high scores such as plastics
Sub- material can also be metal material, but no matter which kind of material, should all have certain rigidity.
In addition, shell 1 includes side wall 11 and from the internally raised collar flange 12 of side wall 11.The present invention is not to cyclic annular convex
The cross sectional shape of edge 12 is defined, and can be irregular shape as shown in Figure 2 A.But cross sectional shape can also
It is the other arbitrary shapes such as rectangle, trapezoidal, triangle.The collar flange 12 both can be with 11 integral forming of side wall, can also
It is the inside that side wall 11 is fixedly connected on as independent component.
Holder 2 is located at the inside of shell 1, including main body 21 and support arm 22.Main body 21 and support arm 22 are integrally-formed, or
The two is fixedly connected.Each support arm 22 and the internal face of shell 1 are fastenedly connected, and are thus remained fixed at the main body 21 of holder 2 outer
The inside of shell 1.The quantity of support arm 22 can be one, but preferably two and more than two, and preferably each support arm 22 exists
The inner homogeneous of shell 1 is distributed, and thus, it is possible to make the pressure that holder 1 is generated by gas in pipelines flowing more uniform, is had
It keeps stablizing conducive to overall structure.In the embodiment that Fig. 2A is shown, support arm number is two, and distribution symmetrical above and below.
According to the present invention, in the inside of the main body 21 of holder 2, open up that there are one pilot holes 23 along the axial direction of shell 1.It is excellent
Selection of land, main body 21 is supported on the center inside shell 1 by support arm 22, and pilot hole 23 is preferably the center for being opened in main body
Position.The pilot hole 23 is the guide rod for slidably receiving baffle 3, this will be described below.
Referring back to Fig. 2A, baffle 3 includes head cover 31 and guide rod 32.Head cover has the inside cross-sectional shape phase with shell 1
Matched shape, but its projected area on the inside cross-sectional is slightly less than the sectional area of 1 inside of shell.Guide rod 32 is from head cover
Side axially stretch out and be inserted into the pilot hole 23 of holder 2.As a result, by guide rod 32 in the inside of pilot hole 23
Sliding, baffle 3 can be equivalent to the sliding axially along shell 1 of holder 2.Also, in barrier slides at some position,
The collar flange 12 of the edge of head cover 31 and shell 1 abuts against to make the space of entire enclosure to be separated, obstructed progress
The circulation of gas.
The first embodiment according to the present invention, also there are one precompressed spring 24, one ends for installing in pilot hole 23
The end of contact guide rod 32, the side end wall of other end contact pilot hole 23.Since spring 24 makees the contact of guide rod 32
With so that baffle 3 has the movement tendency far from holder 2, and after reaching certain distance, and baffle 3 and the ring-type of shell 1 are convex
Edge 12 abuts against.Preferably, it is equipped with sealing ring 4 in head cover 31 and 12 place of abutting against of collar flange.In this embodiment, sealing ring
4 are set to the outer peripheral edge of head cover 3, however, the present invention is not limited thereto, and sealing ring can be arranged on collar flange 12.
As a result, when there is no stream pressure in the gas check (non-return) valve of the present invention, due to the effect for the elastic force that bullet is built, baffle 3
It is pushed to left side, to be abutted against with the collar flange 12 of shell 1.When the stream pressure of the baffle side of gas check (non-return) valve increases
When, the head cover 31 of air-flow compressing baffle 3 is allowed to towards 2 one Slideslip of holder, and guide rod 32 stretches into pilot hole 23.When air-flow is held
When continuous and increase, baffle 3 is urged to and is abutted with holder 2 by air-flow.When air-flow weakens or gas pressure disappears, due to spring 24
Effect, baffle 3 is pushed into abut with the collar flange of shell 1 12 again so that valve is closed again.When the leeward of pipeline
When road direction (i.e. close to the side of holder) air pressure increases, due to the barrier effect of baffle 3, reverse air-flow not will produce.Together
When, even if cause the air pressure of side (close to the side of holder) to be slightly reduced due to the flowing of gas in pipelines, due to spring
Elastic force is persistently generated, baffle 3 will not be opened.Therefore this embodiment of the invention has good inverse-stopping functions, and will not be because
Air pressure in pipeline reduces and opens.
As shown in Figure 2 A, it is preferable that the head cover 31 of baffle 3 has the streamlined in shape along airflow direction, in such manner, it is possible to
When valve body is opened, head cover will not generate air-flow larger resistance.As shown in Figure 2 A, in the embodiment, head cover 31 is set
A kind of spheric is counted into, or can be described as umbrella cover shape.
It is further preferred that some reinforcing ribs 33 are additionally provided between guide rod 32 and umbrella cover shape head cover, so that baffle 3
Overall structure is more firm.Reinforcing rib 33 is like that the umbrella frame of umbrella equally plays the role of supporting cover board.
Preferably, the shape of holder 2 also has the streamlined in shape along airflow direction, and air-flow is generated with weakening it
Resistance.As shown in Figure 2 A, main body 21 has olive shape, and each support arm 22 is tilted from center to both sides.It is highly preferred that holder
2 shape is matched with the shape of baffle 2, in order to when baffle is abutted by gas urges by holder, protect between the two
It keeps steady solid.
Fig. 2 B are the sectional views of the gas check (non-return) valve of the second embodiment of the present invention.Different from the first embodiment should
Second embodiment carries out self-closed using magnetic force.As shown in Figure 2 B, in this embodiment, the first permanent magnetism is equipped in holder 2
Body 61, is provided with the second permanent magnet 62 and third permanent magnet 63 in baffle 3, and the second permanent magnet 61 and third permanent magnet 62 are split
In the both sides of the first permanent magnet 61, the first permanent magnet 61 and the second permanent magnet 62 are mutually exclusive, and the first permanent magnet 61 and third are forever
Magnet 63 attracts each other.Since the second permanent magnet 61 and third permanent magnet 62 are placed in the both sides of the first permanent magnet 61, by each
The interaction of permanent magnet so that baffle 3 has the movement tendency far from holder 2, and after reaching certain distance, baffle 3
It is abutted against with the collar flange 12 of shell 1.
In this second embodiment, it is preferable that the first permanent magnet 61 is set to the side of the close baffle of holder 2, and second
Permanent magnet 62 is set to the side of the close head cover 31 of guide rod 32, and third permanent magnet 63 is set to the side far from head cover 31.
As seen in figs. 2 b and 3b, the first permanent magnet 61 generates the repulsion towards left side (shown in Fig. 2 B) for the second permanent magnet 62, together
When, attraction to the left is generated for third permanent magnet 63, the repulsive force and attraction form a resultant force to the left.Due to
Magnetic force would generally the rapid drawdown with the increase of distance, it is therefore, of the invention this second, third permanent magnet to be set to first forever
The design of magnet both sides so that total distance there are two magnet is closer, and magnetic force will not be made quickly decline occur.
As a result, when there is no stream pressure in the gas check (non-return) valve of the present invention, due to the active force between permanent magnet, baffle
3 are pushed to left side, to be abutted against with the collar flange 12 of shell 1.When the stream pressure of the baffle side of gas check (non-return) valve increases
When big, the head cover 31 of air-flow compressing baffle 3 is allowed to towards 2 one Slideslip of holder, and guide rod 32 stretches into pilot hole 23.Work as air-flow
When continuing and increasing, baffle 3 is urged to and is abutted with holder 2 by air-flow.When air-flow weakens or gas pressure disappears, due to permanent magnetism
The effect of body magnetic force, baffle 3 is pushed into abut with the collar flange of shell 1 12 again so that valve is closed again.Work as pipeline
Lower air duct direction the side of holder (i.e. close to) air pressure when increasing, due to the barrier effect of baffle 3, not will produce reverse gas
Stream.Meanwhile even if when causing the air pressure of side (close to the side of holder) to be slightly reduced due to the flowing of gas in pipelines, due to
Power is persistently acted between permanent magnet, baffle will not be opened.Therefore the present invention has good inverse-stopping functions, and will not
It is opened because the air pressure in pipeline reduces.
Preferably, embodiment as seen in figs. 2 b and 3b has between the second permanent magnet 62 and third permanent magnet 63
It is additionally provided with for positioning and fixed silica gel 5.But this in other implementations, can not also be arranged to fix or positioning
Component.
Fig. 3 A are to be allowed to be pressed on the form on holder when air-flow pushes baffle 3 in embodiment shown in Fig. 2A.Fig. 3 B are
It is allowed to be pressed on the form on holder when air-flow pushes baffle 3 in embodiment shown in Fig. 2 B.Fig. 4 is the part of Fig. 3 A, Fig. 3 B
Enlarged drawing.In Fig. 3 A, Fig. 3 B, arrow indicates the flow direction of air-flow.The arrow of Fig. 4 indicates that baffle and holder offset the positions of press contacts
It sets.As it can be seen that in the embodiment, the contact position of baffle and holder is to have there are one the guide frame being made of inclined surface, this makes
Baffle will not shake after compressing on holder, increase the stability of structure, it is many and prolong the service life.
Fig. 5 is the structural schematic diagram according to an exhaust apparatus of the embodiment of the present invention.The exhaust apparatus uses figure
Gas check (non-return) valve shown in 2B.As shown in figure 5, in addition to gas check (non-return) valve, which further includes pedestal 11, the diameter-varying ring seat of honour
12, diameter-varying ring 13.Pedestal 11 is fixed in the bottom end of the holder side of shell 1, is used for and wall connecting；The diameter-varying ring seat of honour 12 is affixed
Bottom end in the baffle side of shell 1, for being connect with the diameter-varying ring 13, diameter-varying ring is used for connecting pipe.The exhaust apparatus
The side of diameter-varying ring be also provided with the devices such as exhaust fan.As a result, when pipeline generates air-flow, pass through gas check (non-return) valve, gas
Flow to the discharge of 14 side of wall.
It will be appreciated that shown in fig. 5 is only one embodiment of exhaust apparatus, gas check (non-return) valve of the invention can
To be installed in various specifications, exhaust apparatus for various purposes.
In conclusion the gas check (non-return) valve and exhaust apparatus of the present invention use the self-enclosed principle of applied external force, it can
The flowing gas effectivelying prevent in gas pipeline opens valve suction, therefore has good non-return effect.Also, the present invention uses
Guide frame, structure is more firm, is applicable to various application occasions；Each structure member of the present invention is set using streamlined
Meter, can effectively weaken the inhibition to air-flow so that the flowing of air-flow is more smoothly.
Particular embodiments described above has carried out further in detail the purpose of the present invention, technical solution and advantageous effect
Describe in detail bright, it should be understood that the above is only a specific embodiment of the present invention, is not intended to restrict the invention, it is all
Within the spirit and principles in the present invention, any modification, equivalent substitution, improvement and etc. done should be included in the protection of the present invention
Within the scope of.
Claims (14)
1. a kind of gas check (non-return) valve, including shell (1), holder (2) and baffle (3), the holder is fixedly arranged on shell (1) inside,
The shell (1) is the tubular of both ends open, the baffle (3) relative to holder (2) sliding axially along shell (1), to
Open and close the gas check (non-return) valve.
2. gas check (non-return) valve as described in claim 1, which is characterized in that exist between the baffle (3) and holder (2) mutual
The active force of effect, baffle (3) seal the gas check (non-return) valve by the active force.
3. gas check (non-return) valve as described in claim 1, which is characterized in that the baffle (3) and the holder (2) offset crimping
Tactile position has the guide frame being made of inclined surface.
4. gas check (non-return) valve as claimed in claim 2, which is characterized in that the shell (1) includes side wall (11) and from side wall
(11) internally the collar flange (12) of protrusion, the baffle (3) are abutted against by the collar flange (12) with the shell (1)
And close the gas check (non-return) valve.
5. gas check (non-return) valve as claimed in claim 4, which is characterized in that be installed with precompressed bullet in the pilot hole (23)
Spring (24), the end of one end contact guide rod (32), the side end wall of other end contact pilot hole (23).
6. gas check (non-return) valve as claimed in claim 4, which is characterized in that the first permanent magnet (61) is equipped in the holder (2),
It is provided with the second permanent magnet (62) and third permanent magnet (63) in the baffle (3), second permanent magnet (61) and third permanent magnetism
Body (62) is placed in the both sides of the first permanent magnet (61), and the first permanent magnet (61) and the second permanent magnet (62) are mutually exclusive, and
One permanent magnet (61) and third permanent magnet (63) attract each other.
7. gas check (non-return) valve as claimed in claim 6, which is characterized in that first permanent magnet (61) is set to holder (2)
Close baffle (3) side, second permanent magnet (62) be set to the guide rod (32) close to the head cover (31)
Side, the third permanent magnet (63) is set to the side far from the head cover (31).
8. gas check (non-return) valve as claimed in claim 4, which is characterized in that the holder (2) along the shell (1) axial direction
Pilot hole (23) is offered, the baffle (3) includes head cover (31) and guide rod (32), and the head cover (31) is used for and the ring
Shape flange (12) abuts against, and the guide rod (32) is inserted into the pilot hole (23) and sliding relative to the pilot hole (23)
It is dynamic.
9. gas check (non-return) valve as claimed in claim 8, which is characterized in that the head cover (31) has the stream along airflow direction
Linear shape.
10. gas check (non-return) valve as claimed in claim 9, which is characterized in that the head cover (31) is umbrella cover shape, and the head cover
(31) reinforcing rib (33) is equipped between the guide rod (32).
11. gas check (non-return) valve as claimed in claim 8, which is characterized in that the holder (2) includes main body (21) and support arm
(22), the support arm (22) and the internal face of the shell (1) are fastenedly connected, and the main body (21) is thus remained fixed at institute
The inside of shell (1) is stated, the pilot hole (23) is formed in the main body (21).
12. gas check (non-return) valve as claimed in claim 11, which is characterized in that the holder (2) has along airflow direction
Streamlined in shape.
13. gas check (non-return) valve as claimed in claim 12, which is characterized in that the main body (21) is olive shape, the support arm
(22) it is tilted from center to both sides.
14. the gas check (non-return) valve described in any one of a kind of exhaust apparatus, including claim 1 to 13.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810468185.7A CN108413084A (en) | 2018-05-16 | 2018-05-16 | A kind of gas check (non-return) valve and exhaust apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810468185.7A CN108413084A (en) | 2018-05-16 | 2018-05-16 | A kind of gas check (non-return) valve and exhaust apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108413084A true CN108413084A (en) | 2018-08-17 |
Family
ID=63139487
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810468185.7A Pending CN108413084A (en) | 2018-05-16 | 2018-05-16 | A kind of gas check (non-return) valve and exhaust apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110094556A (en) * | 2019-05-28 | 2019-08-06 | 浙江独创空间智能科技有限公司 | A kind of magnetic suspension cigarette stops valve and its exhaust apparatus |
| CN113339552A (en) * | 2021-07-12 | 2021-09-03 | 深圳市金力洁净设备安装有限公司 | Clean compressed air conveying pipeline system |
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| CN204756041U (en) * | 2015-07-04 | 2015-11-11 | 方正阀门集团(温州)机械制造有限公司 | Axial -flow type check valve |
| CN205260932U (en) * | 2015-12-31 | 2016-05-25 | 重庆科特工业阀门有限公司 | Spacing damping check valve of wear -resisting cutting ferrule of axial -flow type |
| CN205260931U (en) * | 2015-12-31 | 2016-05-25 | 慎江阀门有限公司 | Bionical low pressure drop axial -flow type check valve |
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