CN206943505U - Damping check valve - Google Patents
Damping check valve Download PDFInfo
- Publication number
- CN206943505U CN206943505U CN201720651925.1U CN201720651925U CN206943505U CN 206943505 U CN206943505 U CN 206943505U CN 201720651925 U CN201720651925 U CN 201720651925U CN 206943505 U CN206943505 U CN 206943505U
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- Prior art keywords
- flap
- valve
- valve shaft
- guide sleeve
- damping check
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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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Abstract
The utility model provides a kind of damping check valve, is related to valve equipment technology field, and damping check valve includes valve body, valve seat, flap, valve shaft, spring and valve shaft guide sleeve；Valve seat is fixed on the water inlet port of valve body, and valve shaft guide sleeve is fixed on the water outlet port of valve body, and valve shaft is fixed between valve seat and valve shaft guide sleeve, and spring and flap are socketed on valve shaft, and spring is between valve shaft guide sleeve and flap；Valve seat is provided with the accommodating chamber that can be socketed flap towards one end of flap, and accommodating chamber is provided with first seal with the one side that flap offsets, and the side of flap is provided with second seal.Alleviate damping check valve usage time of the prior art it is longer in the case of cause sealing to reduce and the larger technical problem of noise.
Description
Technical field
Valve equipment technology field is the utility model is related to, in particular to a kind of damping check valve.
Background technology
Damping check valve refers to flow in itself by medium and automatic open and close flap, for preventing the valve of medium refluence,
Also known as non-return valve, check valve, damping check valve reflux valve and counterbalance valve.Check-valves belongs to a kind of automatic valve, its main function
It is prevent medium from flowing backwards, prevent pump and drive motor from inverting, and vessel media is released.Check-valves can be additionally used in wherein
Pressure may be raised above system pressure accessory system provide supply pipeline on.Check-valves can be divided mainly into swing type non-return
Valve (being rotated according to center of gravity) and lift check valve (being moved along axis).
Lift check valve of the prior art be by flap with valve seat towards flap while abut to reach
To the effect for preventing that medium from flowing backwards, for the damping check valve set relative to ground level, under much time using, flap
Gap and sealing are easily produced between valve seat to be reduced, and causes the water of check-valves water outlet port to be back into water port；Meanwhile
Due to the resilience of flap and valve seat in itself, after pressure suddenly disappears, the pressure of water outlet port medium back flow can make flap with
Geo-stationary can just be returned to for several times by being collided between valve seat, in the process, be also easy to produce larger noise, influenceed Consumer's Experience.
Utility model content
The purpose of this utility model is to provide a kind of damping check valve, made with alleviating damping check valve of the prior art
Cause the technical problem that sealing reduces and noise is larger in the case of longer with the time.
The utility model provides a kind of damping check valve, including valve body, valve seat, flap, valve shaft, spring and valve shaft are oriented to
Set；
The valve seat is fixed on the water inlet port of the valve body, and the valve shaft guide sleeve is fixed on the water side of the valve body
Mouthful, the valve shaft is fixed between the valve seat and the valve shaft guide sleeve, and the spring and the flap are socketed in the valve
On axle, and the spring is between the valve shaft guide sleeve and the flap；
The valve seat is provided with the accommodating chamber that can be socketed the flap, the accommodating chamber and institute towards one end of the flap
State the one side that flap offsets and be provided with first seal, the side of the flap is provided with second seal.
Further；The flap is that cylinder and round platform combine the assembly to be formed, and the round platform is straight compared with large end face
Footpath is equal to the diameter of the cylinder, and the larger end face of the round platform is bonded fixation, the circle with the end face of the cylinder
The less end face of platform is towards the valve seat.
Further；The second seal is wear-resistant seal circle, and the side of the flap is provided with o-ring groove.
Further；The cross section of the o-ring groove is swallow-tail form.
Further；The first seal is rubber buffer, and the rubber buffer is pasted and fixed on the receiving
The one side that chamber offsets with the flap.
Further；The first seal is O-ring seals, and the O-ring seals are fixed on the accommodating chamber
The one side to be offseted with the flap.
Further；The water inlet port of the valve body and water outlet port are respectively welded flange.
Further；Cavity inside the valve seat is spindle shape.
The utility model also provides a kind of damping check valve, including valve body, valve seat, flap, valve shaft, spring and valve shaft are led
To set；
The valve seat is fixed on the water inlet port of the valve body, and the valve shaft guide sleeve is fixed on the water side of the valve body
Mouthful, described valve shaft one end is fixedly connected with the flap, and the other end is socketed with the valve shaft guide sleeve, and the spring is socketed in institute
State on valve shaft, and the spring is between the valve shaft guide sleeve and the flap；
The valve seat is provided with the accommodating chamber that can be socketed the flap, the accommodating chamber and institute towards one end of the flap
State the one side that flap offsets and be provided with bolster, the side of the flap is provided with seal.
Further；Nonmetallic lubricating sleeve is provided between the valve shaft guide sleeve and the valve shaft.
Relative to prior art, damping check valve provided by the utility model has the beneficial effect that：
Damping check valve provided by the utility model, by setting valve shaft to be fixed between valve seat and valve shaft guide sleeve, bullet
Spring and flap are socketed on the valve shaft, and spring enables impact of the flap in medium between valve shaft guide sleeve and flap
Slided under the lower and thrust of spring along valve shaft is relative, the accommodating chamber that can be socketed flap is set also on valve seat, i.e., in water inlet end
During mouth distress resolves, the pressure promotion flap of water outlet port slips into accommodating chamber and finally the bottom surface with accommodating chamber offsets, herein mistake
Cheng Zhong, the side of accommodating chamber can produce certain frictional resistance to the side of flap, slow down when flap finally abuts with valve seat
Impulsive force, and when flap finally abuts with valve seat, accommodating chamber side can further prevent the resilience of flap, reduce both
Between frequent shock, reduce the generation of noise.
Meanwhile the one side also to be offseted in accommodating chamber and flap is provided with first seal, the side of flap is provided with the second sealing
Part, secondary seal further ensure that the sealing property of check-valves；And while first seal plays sealing function, also
Increase flap side and accommodating chamber side between frictional force and reduce contact between the two caused by noise, second seal
While playing sealing function, noise caused by collision between flap and accommodating chamber bottom surface is decreased, further ensure that
The noise elimination function of check-valves.
Another damping check valve provided by the utility model, it is to set flap and valve shaft to be relatively fixed and can be with respect to valve
Axle guide sleeve slides, and now, valve seat center need not set the through hole of fixed flap, simple in construction, be more suitable for into water port
In pipeline directed downwardly.In addition, the technical advantage that the other structures of this damping check valve play rises with above-mentioned damping check valve
The technical advantage arrived is identical, and here is omitted.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art, it should be apparent that, describe below
In accompanying drawing be some embodiments of the present utility model, for those of ordinary skill in the art, do not paying creativeness
On the premise of work, other accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation for the damping check valve that the utility model embodiment one provides；
Fig. 2 is the zoomed-in view of A in Fig. 1；
Fig. 3 is the left view for the damping check valve that the utility model embodiment one provides；
Fig. 4 is the right view for the damping check valve that the utility model embodiment one provides；
Fig. 5 is the structural representation for the damping check valve that the utility model embodiment two provides；
Fig. 6 is another structural representation of valve shaft and flap in the damping check valve that the utility model embodiment two provides.
Icon：1- valve bodies；2- flaps；3- valve shafts；4- valve shaft guide sleeves；5- springs；6- accommodating chambers；7- flanges；
8- wear-resistant seal circles；9-O shape sealing rings；11- valve seats.
Embodiment
The technical solution of the utility model is clearly and completely described below in conjunction with accompanying drawing, it is clear that described
Embodiment is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, sheet
The every other embodiment that field those of ordinary skill is obtained under the premise of creative work is not made, belongs to this practicality
Novel protected scope.
, it is necessary to explanation in description of the present utility model, term " " center ", " on ", " under ", it is "left", "right", " perpendicular
Directly ", the orientation of the instruction such as " level ", " interior ", " outer " or position relationship are based on orientation shown in the drawings or position relationship, are only
Described for the ease of description the utility model and simplifying, rather than instruction or imply signified device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.In addition, term " the
One ", " second ", " the 3rd " are only used for describing purpose, and it is not intended that instruction or hint relative importance.
, it is necessary to which explanation, unless otherwise clearly defined and limited, term " are pacified in description of the present utility model
Dress ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected or be detachably connected, or integratedly
Connection；Can be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning of the language in the utility model.
Fig. 1 is the structural representation for the damping check valve that the utility model embodiment one provides；Fig. 2 is the amplification of A in Fig. 1
View；Fig. 3 is the left view for the damping check valve that the utility model embodiment one provides；Fig. 4 is the utility model embodiment one
The right view of the damping check valve of offer；Fig. 5 is the structural representation for the damping check valve that the utility model embodiment two provides；
Fig. 6 is another structural representation of valve shaft and flap in the damping check valve that the utility model embodiment two provides.
Embodiment one
Shown as shown in Figure 1, Figure 3 and Figure 4, the utility model embodiment provides a kind of damping check valve, including valve body 1, valve seat
11st, flap 2, valve shaft 3, spring 5 and valve shaft guide sleeve 4；Valve seat 11 is fixed on the water inlet port of valve body 1, and valve shaft guide sleeve 4 is solid
The water outlet port of valve body 1 is scheduled on, valve shaft 3 is fixed between valve seat 11 and valve shaft guide sleeve 4, and spring 5 and flap 2 are socketed in valve shaft
On 3, and spring 5 is between valve shaft guide sleeve 4 and flap 2；Valve seat 11 is provided with towards one end of flap 2 can be socketed flap 2
Accommodating chamber 6, the one side that accommodating chamber 6 and flap 2 offset is provided with first seal, and the side of flap 2 is provided with second seal.
The damping check valve that the utility model embodiment provides, by setting, valve shaft 3 is fixed on valve seat 11 and valve shaft is oriented to
Between set 4, spring 5 and flap 2 are socketed on the valve shaft 3, and spring 5 makes flap 2 between valve shaft guide sleeve 4 and flap 2
It can be slided under the impact of medium and under the thrust of spring 5 along valve shaft 3 is relative, flap can be socketed by being set also on valve seat 11
2 accommodating chamber 6, i.e., when intaking port distress resolves, the pressure of water outlet port promote flap 2 slip into accommodating chamber 6 and finally with
The bottom surface of accommodating chamber 6 offsets, and in the process, the side of accommodating chamber 6 can produce certain frictional resistance to the side of flap 2,
Slow down impulsive force when flap 2 finally abuts with valve seat 11, and when flap 2 finally abuts with valve seat 11, the side energy of accommodating chamber 6
Enough resiliences for further preventing flap 2, reduce frequent shock between the two, reduce the generation of noise.
Meanwhile the one side also to be offseted in accommodating chamber 6 and flap 2 is provided with first seal, the side of flap 2 is close provided with second
Sealing, secondary seal further ensure that the sealing property of check-valves；And while first seal plays sealing function,
Also increase the frictional force between the side of flap 2 and the side of accommodating chamber 6 and reduce contact between the two caused by noise, second is close
While sealing plays sealing function, noise caused by collision between flap 2 and the bottom surface of accommodating chamber 6 is decreased, further
It ensure that the noise elimination function of check-valves.
It is worth mentioning, because the both ends of valve shaft 3 are fixed by valve shaft guide sleeve 4 and valve seat 11 simultaneously, and flap 2 is in bullet
Relatively moved in the presence of spring 5 along valve shaft 3, so this damping check valve can be placed relative to ground level, it is of course also possible to
It is vertical to place, now, damping check valve water inlet end mouth down.
Further, since the present embodiment provide damping check valve flap 2 enter accommodating chamber 6 after, due to being accommodated
The resistance of the side wall of chamber 6, in the case of by external force, do not falling out easily, therefore, need not the company of control in damping check valve
In the case of logical pressure, spring 5 can also be not provided with, equally meets the effect for preventing medium from flowing backwards of damping check valve.
Specifically, it is described below for the concrete structure of damping check valve in the present embodiment：
It can be socketed in order to facilitate flap 2 with accommodating chamber 6, it is cylindrical shape that the present embodiment, which sets flap 2, the court of flap 2
Necking is provided with to one end of accommodating chamber 6.
Specifically, now accommodating chamber 6 is also cylindrical shape, and now, after flap 2 slips into accommodating chamber 6, the side of flap 2
Face and the contact area of accommodating chamber 6 are also larger, can more play a part of buffering flap 2 to the impulsive force of valve seat 11.In addition, it is contemplated that
The diameter of accommodating chamber 6 is only slightly larger than the diameter of flap 2, and flap 2 can rock relative to valve shaft 3 with certain, so in order to
Flap 2 is facilitated to enter accommodating chamber 6, it is that cylinder and round platform combine the assembly to be formed that the present embodiment, which sets flap 2, wherein, circle
Platform is equal to the diameter of cylinder compared with the diameter of large end face, and the larger end face of round platform is bonded fixation, round platform with the end face of cylinder
Less end face is similar to bullet shape towards valve seat 11, flap 2 now, and the less end face of its diameter can be against receiving
The bottom surface of chamber 6.
While sealing function being played in view of second seal, it is also necessary to there is certain wearability, ensure in flap 2
It will not wear easily when frequently being slided between accommodating chamber 6 and influence its sealing, therefore, the present embodiment sets second seal
For wear-resistant seal circle 8, accordingly, also o-ring groove is provided with the side of flap 2.
Wear-resistant seal circle 8 can be that the NR natural rubbers with good wearability, elasticity, breaking strength and elongation are close
Seal.Can also be PU polyurethane rubber sealing rings, the mechanical performance of polyurethane rubber is very good, wear-resisting, high voltage performance is equal
It is much better than other rubber, and resistance to ag(e)ing, oil resistivity are also fairly good, Applicable media is wide, service life length.
Further, as shown in Fig. 2 the cross section that the present embodiment also sets up o-ring groove is swallow-tail form, i.e. groove is opened
Width at mouthful is less than the width in groove, after wear-resistant seal circle 8 is fixed on o-ring groove, can bear flap 2 more times
Relative slip and extraneous hydraulic pressure are to its caused impulsive force between accommodating chamber 6, it is therefore prevented that deviate from o-ring groove, ensure close
The stability of envelope.
Further；Easy flap 2 and the bottom surface of accommodating chamber 6 offset place contact area it is relatively large, in order to ensure herein
Sealing and anti-acoustic capability, it is rubber buffer that the present embodiment, which sets first seal, and rubber buffer is pasted and fixed on receiving
The one side that chamber 6 offsets with flap 2.
Specifically, rubber buffer is to have one with the base area identical cirque structure of accommodating chamber 6, rubber buffer
Fixed thickness and resilience, after it is bonded on the bottom surface of accommodating chamber 6, flap 2 quickly slides under the pressure of water outlet port
During the bottom surface of accommodating chamber 6, after wear-resistant seal circle 8 for the first time buffering, it can also contact with rubber buffer, further subtract again
The impulsive force of slow flap 2, makes whole process hardly produce noise, meets the needs of user.
Or, it is contemplated that under specific media environment or excessive impact force action, rubber buffer is easily from receiving
Depart from the bottom surface of chamber 6, it is O-ring seals 9 that can also set first seal, and O-ring seals 9 are fixed on accommodating chamber 6
The one side to be offseted with the flap 2.
Specifically, as shown in Fig. 2 the annular groove that cross section is swallow-tail form, O can also be provided with the bottom surface of accommodating chamber 6
After shape sealing ring 9 is connected to annular groove, it can bear, into media impingement power bigger at water port, to ensure that check valve seal
The stabilization of structure.
Further, the present embodiment also sets up the water inlet port of valve body 1 and water outlet port is respectively welded flange 7, flange 7
On be uniformly provided with screwed hole, damping check valve is bolted on pipeline.
It is noted that the flange 7 and valve seat 11 in the present embodiment are integrally formed with valve body 1, it ensure that noise elimination stops
Return the stabilization of valve arrangement.
Further, the cavity that the present embodiment also sets up inside valve seat 11 is spindle shape.Spindle shape makes flap 2
The distance between inwall increases, and will not reduce sectional area because of the reason for flap 2, when fluid media (medium) enters damping check valve
Obvious pressure differential will not be produced, improves medium flow direction, reduces flow resistance coefficient.
Embodiment two
As shown in figure 5, the utility model embodiment provides a kind of damping check valve, including valve body 1, valve seat 11, flap 2,
Valve shaft 3, spring 5 and valve shaft guide sleeve 4；Valve seat 11 is fixed on the water inlet port of valve body 1, and valve shaft guide sleeve 4 is fixed on valve body 1
Water outlet port, the one end of valve shaft 3 is fixedly connected with flap 2, and the other end is socketed with valve shaft guide sleeve 4, and spring 5 is socketed in valve shaft 3
On, and spring 5 is between valve shaft guide sleeve 4 and flap 2；Valve seat 11 is provided with towards one end of flap 2 can be socketed flap 2
Accommodating chamber 6, accommodating chamber 6 are provided with bolster with the one side that flap 2 offsets, and the side of flap 2 is provided with seal.
The damping check valve that the utility model embodiment provides, it is to set flap 2 to be relatively fixed with valve shaft 3 and can be relative
Valve shaft guide sleeve 4 slides, and now, the center of valve seat 11 need not set the through hole of fixed flap 2, simple in construction, be more suitable for into
In the pipeline of water end (W.E.) mouth down.In addition, the technical advantage that the other structures of this damping check valve play is stopped with above-mentioned noise elimination
Return that the technical advantage that plays of valve is identical, and here is omitted.
In the present embodiment, in the case of not having pressure when water inlet port, flap 2 can be inserted in receiving under gravity
Chamber 6, completion prevent medium back flow function, and therefore, the present embodiment equally can meet to require without using spring 5.
In addition, as shown in figure 5, valve shaft 3 and flap 2 in the present embodiment can be integrally formed；As shown in fig. 6, can also
By valve shaft 3 and the card dismantling connection of flap 2, both can be fixed by alignment pin, can also be fixed by being interference fitted.
Further, the present embodiment is provided with nonmetallic lubricating sleeve also between valve shaft guide sleeve 4 and valve shaft 3.
Specifically, the present embodiment is to be slided by the valve shaft 3 being fixedly connected with flap 2 relative to valve shaft guide sleeve 4 come real
Existing check function, compared to the force of sliding friction between above-mentioned damping check valve flap 2 and valve shaft 3, valve shaft guide sleeve 4 and valve shaft
Force of sliding friction between 3 is bigger, by setting nonmetallic lubricating sleeve, can reduce friction between the two, lift flap 2
Flexibly, locking phenomenon will not be produced.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type.
Claims (10)
1. a kind of damping check valve, it is characterised in that including valve body (1), valve seat (11), flap (2), valve shaft (3), spring (5)
And valve shaft guide sleeve (4)；
The valve seat (11) is fixed on the water inlet port of the valve body (1), and the valve shaft guide sleeve (4) is fixed on the valve body
(1) water outlet port, the valve shaft (3) are fixed between the valve seat (11) and the valve shaft guide sleeve (4), the spring
(5) it is socketed in the flap (2) on the valve shaft (3), and the spring (5) is located at the valve shaft guide sleeve (4) and described
Between flap (2)；
The valve seat (11) is provided with the accommodating chamber (6) that can be socketed the flap (2) towards one end of the flap (2), described
Accommodating chamber (6) is provided with first seal with the one side that the flap (2) offsets, and the side of the flap (2) is provided with the second sealing
Part.
2. damping check valve according to claim 1, it is characterised in that the flap (2) is that cylinder and round platform combine
The assembly of formation, the round platform are equal to the diameter of the cylinder, and the end face that the round platform is larger compared with the diameter of large end face
It is bonded fixation with the end face of the cylinder, the less end face of round platform is towards the valve seat (11).
3. damping check valve according to claim 1, it is characterised in that the second seal is wear-resistant seal circle (8),
The side of the flap (2) is provided with o-ring groove.
4. damping check valve according to claim 3, it is characterised in that the cross section of the o-ring groove is dovetail
Shape.
5. damping check valve according to claim 1, it is characterised in that the first seal is rubber buffer, institute
State rubber buffer and be pasted and fixed on the one side that the accommodating chamber (6) offsets with the flap (2).
6. damping check valve according to claim 1, it is characterised in that the first seal is O-ring seals (9),
The O-ring seals (9) are fixed on the one side that the accommodating chamber (6) offsets with the flap (2).
7. damping check valve according to claim 1, it is characterised in that the water inlet port and water side of the valve body (1)
Mouth is respectively welded flange (7).
8. damping check valve according to claim 1, it is characterised in that the internal cavity of the valve seat (11) is spindle
Shape.
9. a kind of damping check valve, it is characterised in that including valve body (1), valve seat (11), flap (2), valve shaft (3), spring (5)
And valve shaft guide sleeve (4)；
The valve seat (11) is fixed on the water inlet port of the valve body (1), and the valve shaft guide sleeve (4) is fixed on the valve body
(1) water outlet port, described valve shaft (3) one end are fixedly connected with the flap (2), the other end and the valve shaft guide sleeve (4)
Socket, the spring (5) is socketed on the valve shaft (3), and the spring (5) is located at the valve shaft guide sleeve (4) and described
Between flap (2)；
The valve seat (11) is provided with the accommodating chamber (6) that can be socketed the flap (2) towards one end of the flap (2), described
Accommodating chamber (6) is provided with bolster with the one side that the flap (2) offsets, and the side of the flap (2) is provided with seal.
10. damping check valve according to claim 9, it is characterised in that the valve shaft guide sleeve (4) and the valve shaft
(3) nonmetallic lubricating sleeve is provided between.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720651925.1U CN206943505U (en) | 2017-06-06 | 2017-06-06 | Damping check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720651925.1U CN206943505U (en) | 2017-06-06 | 2017-06-06 | Damping check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206943505U true CN206943505U (en) | 2018-01-30 |
Family
ID=61362071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720651925.1U Expired - Fee Related CN206943505U (en) | 2017-06-06 | 2017-06-06 | Damping check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206943505U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110485511A (en) * | 2019-08-19 | 2019-11-22 | 上海威派格智慧水务股份有限公司 | The fresh and alive device of water body in a kind of holding air pressure tank |
| JP2020008038A (en) * | 2018-07-04 | 2020-01-16 | 北越工業株式会社 | Gas control valve |
| CN110822135A (en) * | 2019-11-20 | 2020-02-21 | 蚌埠中光电科技有限公司 | Novel check valve |
-
2017
- 2017-06-06 CN CN201720651925.1U patent/CN206943505U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2020008038A (en) * | 2018-07-04 | 2020-01-16 | 北越工業株式会社 | Gas control valve |
| JP7262186B2 (en) | 2018-07-04 | 2023-04-21 | 北越工業株式会社 | gas control valve |
| CN110485511A (en) * | 2019-08-19 | 2019-11-22 | 上海威派格智慧水务股份有限公司 | The fresh and alive device of water body in a kind of holding air pressure tank |
| CN110822135A (en) * | 2019-11-20 | 2020-02-21 | 蚌埠中光电科技有限公司 | Novel check valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180130 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |