CN109990121A - A kind of swing check valve - Google Patents
A kind of swing check valve Download PDFInfo
- Publication number
- CN109990121A CN109990121A CN201910311238.9A CN201910311238A CN109990121A CN 109990121 A CN109990121 A CN 109990121A CN 201910311238 A CN201910311238 A CN 201910311238A CN 109990121 A CN109990121 A CN 109990121A
- Authority
- CN
- China
- Prior art keywords
- flap
- rocker arm
- piston
- check valve
- swing check
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000005484 gravity Effects 0.000 claims abstract description 12
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 16
- 230000004308 accommodation Effects 0.000 claims description 9
- 210000004907 gland Anatomy 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 6
- 238000005299 abrasion Methods 0.000 abstract description 5
- 230000002028 premature Effects 0.000 abstract description 5
- 238000013016 damping Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure 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
- 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
- F16K27/0227—Check valves or pivoted valves with the valve members swinging around an axis located at the edge of or outside 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
- F16K47/00—Means in valves for absorbing fluid energy
Abstract
The present invention relates to a kind of swing check valve, including valve body and it is mounted on the intracorporal rocker arm of valve and flap；The flap is connected with the rocker arm, and can swing on the rocker arm, and the flap is equipped with support level in center of gravity, support rod is provided between the rocker arm and the flap, described support rod one end is connected with the rocker arm, support level described in other end contact.Rocker arm and flap are formed and are flexibly connected by the present invention, so that flap has certain freedom degree, it can be swung on rocker arm, it with adjust automatically angle, and is supported by center of gravity of the support rod to flap, so that the self weight of flap and supporting point do not have torque, form gravity self-balancing, flap will not generate deflection under self weight, and then prevent flap or valve seat top premature abrasion or bite occurs, scratches, and ensure that the sealing performance of valve.
Description
Technical field
The present invention relates to check-valves technical fields, and in particular to a kind of swing check valve.
Background technique
Swing check valve is also known as check valve or non-return valve, and effect is to prevent the medium in pipeline from flowing backwards.Opening and closing element leans on
Media flow and strength voluntarily open or close, to prevent the valve of medium refluence check-valves.Check-valves belongs to automatic valve class,
It is mainly used on the pipeline of medium one-way flow, only medium is allowed to flow to a direction, to try to avert accidents.
Usually there are two types of modes for the rotation mode of swing check valve flap at present, and one is flaps and the direct chain of shaft
It connects, flap, which can enclose, to rotate around the axis.But the position accuracy demand of the structure shaft is higher, the flap connecting hole with shaft cooperation
It is larger in process such as error with the connecting hole of valve body, it is easy to appear the feelings that flap and angle of valve seat have deviation that can not seal
Condition.This form processing difficulties, sealing effect is bad, therefore is rarely employed.
To solve the above-mentioned problems, the flap of another swing check valve is flexibly connected with rocker arm, and the two has certain
Freedom degree can automatically adjust certain angle.Rocker arm is linked with valve body by shaft, and rocker arm can surround shaft with flap together
Rotation can adjust angle with valve seat, be easy to be fitted close with valve seat so that flap has freedom degree.But the flap of the structure
Self weight can be such that flap tilts down, and flap top is first contacted with valve seat, flap or valve seat top premature abrasion or be easy to happen card
It is puckery, scratch the problems such as, cause valve seal performance decline.
Summary of the invention
The purpose of the present invention is to provide a kind of swing check valve, with solve existing swing check valve flap or
Valve seat top premature abrasion or be easy to happen bite, scratch, cause valve seal performance decline the problem of.
To achieve the above object, technical solution proposed by the present invention is as follows: a kind of swing check valve, including valve body and peace
Mounted in the intracorporal rocker arm of valve and flap；The flap is connected with the rocker arm, and can swing on the rocker arm, the flap
It is equipped with support level in center of gravity, support rod is provided between the rocker arm and the flap, described support rod one end is shaken with described
Arm is connected, support level described in other end contact.
Rocker arm and flap are formed and are flexibly connected by the swing check valve provided according to the present invention, so that flap has one
Fixed freedom degree can be swung on rocker arm, with adjust automatically angle, and be propped up by center of gravity of the support rod to flap
Support forms gravity self-balancing so that the self weight of flap and supporting point do not have torque, and flap will not generate deflection under self weight, into
And prevent flap or valve seat top premature abrasion or bite occurs, scratches, it ensure that the sealing performance of valve body.
Based on the above technical solution, the present invention can also have following additional technical feature:
An example according to the present invention, the flap are equipped with fluting, the fluting formation close to the side of the rocker arm
The support level.
An example according to the present invention, one end of support level described in the support rod contact are spheric end, the spherical shape
End a part is located in the support level, pressure ring is arranged on another part, the flap is socketed on the pressure ring.
An example according to the present invention, the valve body are equipped with feed liquor nozzle, install buffer unit in the feed liquor nozzle,
The flap abuts against when closing with the buffer unit, to delay the closing velocity of the flap.
An example according to the present invention, the buffer unit are equipped with guide groove, and the flap is close to the buffer unit
Side be equipped with the guide part that matches with the guide groove.
An example according to the present invention, the buffer unit includes pedestal and piston component；The pedestal be mounted on into
In liquid pipe mouth, the pedestal is provided with plunger shaft close to the side of the flap；The piston component is mounted on the plunger shaft
Interior, the piston component part is located at outside the plunger shaft, is located at the piston with the piston component when flap is closed
It mutually supports part outside chamber.
An example according to the present invention, the piston component includes elastic component and piston；The elastic component is mounted on institute
It states in plunger shaft；The piston is connected with the elastic component, and a part is located in the plunger shaft, and another part, which is located at, lives
It fills in outside chamber；The pedestal is equipped with the through-hole being connected with the plunger shaft far from the side of the flap.
An example according to the present invention, the pedestal are equipped with accommodation groove, the accommodation groove close to the side of the flap
Opening the gland equipped with opening is installed, the accommodation groove and the gland form the plunger shaft；The piston is separate
One end of the flap is equipped with the positive stop end with the opening limit cooperation.
An example according to the present invention, the piston are equipped with installation cavity open at one end；Described elastic component one end and institute
It states pedestal to be connected, the other end protrudes into the installation cavity and is connected with the piston.
An example according to the present invention, the rocker arm is equipped with positive stop lug boss close to the side of the flap, to limit
State hunting range of the flap on the rocker arm.
The advantages of above additional aspect, will be set forth in part in the description, and partially will become from the following description bright
It is aobvious, or practice through the invention recognizes.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the swing check valve of the embodiment of the present invention.
In figure: 1. valve bodies；2. flap；3. support rod；4. the first nut；5. pressure ring；6. rocker arm；7 valve decks；8. the second spiral shell
It is female；9. the first bolt；10. shaft；11. the second bolt；12. gland；13. elastic component；14. piston；15. plunger shaft；16. logical
Hole；17. protrusion；18. feed liquor nozzle；19, positive stop lug boss.
Specific embodiment
The principle and features of the present invention will be described below with reference to the accompanying drawings, and the given examples are served only to explain the present invention, and
It is non-to be used to limit the scope of the invention.
In conjunction with shown in attached drawing 1, a kind of swing check valve, including valve body 1, valve deck 7,6 and of rocker arm are present embodiments provided
The components such as flap 2；There is cavity, and valve body 1 is equipped with the feed liquor nozzle being connected with inlet pipe inside the valve body 1 of the present embodiment
18, it should be noted that the feed liquor nozzle 18 of the present embodiment is also the tube body with certain length, it is not necessarily referring to generation one individually
Hatch frame；The valve deck 7 of the present embodiment is mounted on valve body 1 by the first bolt 9 and the second nut 8；Shaft is equipped in valve body 1
10, one end of rocker arm 6 is mounted in shaft 10, and the other end is connected with above-mentioned flap 2, so that rocker arm 6 turns in shaft 10
Flap 2 is driven to rotate when dynamic.
The improvement of the present embodiment compared with the prior art is, flap 2 and rocker arm 6 are flexibly connected, so that flap 2 can be
It is swung on rocker arm 6 around itself center of gravity, with adjust automatically angle；And flap 2 is equipped in center of gravity (generally centre)
Support level is provided with support rod 3 between rocker arm 6 and flap 2,3 one end of support rod is connected with rocker arm 6 by the first nut 4, separately
One end contact support level is supported by center of gravity of the support rod 3 to flap 2, so that the self weight of flap 2 does not have with supporting point
Torque forms gravity self-balancing, and flap 2 will not generate deflection under self weight, and then prevent flap 2 or valve seat top premature abrasion
Or bite occurs, scratches, it ensure that the sealing performance of valve body 1.
The structure type of the above-mentioned support level of the present embodiment and support rod is further illustrated below:
As shown in Figure 1, the flap 2 of the present embodiment is equipped with fluting in the side close to rocker arm 6, fluting forms above-mentioned support
Position, certainly other structures that can be contacted with support rod 3 can also the present embodiment it is optional within the scope of.
And in order to realize that the opposite of flap 2 and rocker arm 6 swings, the present embodiment designs that a kind of structure is simple and stable connection
One end of 3 contact support level of support rod is designed as spheric end by 3 structure of support rod, and spheric end a part is located in support level, separately
Pressure ring 5 is arranged in a part, flap 2 is socketed on pressure ring 5, and is not directly contacted with rocker arm 6；The pressure ring 5 of the present embodiment
It can have certain elasticity, the flap 2 on support rod 3 can also be mounted on by pressure ring 5 to realize with spheric end clearance fit
The swing of certain angle can be carried out on it.
And in order to limit hunting range of the flap on the rocker arm, this implementation is also in rocker arm close to the flap
Side is equipped with positive stop lug boss 19.
Illustrate in conjunction with above structure, inventors have found that existing flap 2 during being pivoted closing, is easy to produce
Raw closing velocity is too fast, causes 2 sealing surface of flap excessive to the impact force of sealing surface of seat, is easily damaged；Meanwhile non-return flap
2 in quick closedown, is easy to produce water hammer, causes valve by the generation for the Harms such as destroying；Therefore the present embodiment is done again
It is further out to improve, buffer unit is installed in the feed liquor nozzle 18 of valve body 1, flap 2 abuts against when closing with buffer unit,
Delay the closing velocity of flap 2 by buffer unit.
Moreover, in order to further prevent 2 deflection of flap, and it is convenient for the cooperation of flap 2 and buffer unit, the present embodiment
Buffer unit is equipped with guide groove, and flap 2 is equipped with the guide part matched with guide groove, the guide part close to the side of buffer unit
For the protrusion 17 on flap 2 is arranged in, guiding role is realized by protrusion 17 and the cooperation of guide groove, prevents 2 deflection of flap, together
When convenient for flap 2 and buffer unit connection position.
The buffer unit of the present embodiment can be using any damping mechanism in the prior art, such as the damping dress of piston 14
Set, but inventors have found that 14 damping unit of existing piston needs to fill damping fluid, and design damping oil circuit, not only at
This is higher, and is not easy to be mounted in the lesser feed liquor nozzle 18 in space, therefore inventor devises a kind of new buffering dress
It sets.
The buffer unit includes pedestal and piston component；The pedestal of the present embodiment is mounted in feed liquor nozzle 18, and with
The inner wall of feed liquor nozzle 18 is connected, and pedestal is provided with accommodation groove close to the side of flap 2, and the opening of accommodation groove passes through second
Bolt 11 is equipped with gland 12, and accommodation groove and gland 12 form plunger shaft 15, and are equipped on gland 12 and wear for piston component
The opening crossed, and the through-hole 16 being connected with plunger shaft 15 is equipped with far from the side of flap 2 in pedestal.
The piston component of the present embodiment is mounted in plunger shaft 15, and piston component part is located at outside plunger shaft 15, and flap 2 closes
It is located at the part outside plunger shaft 15 with piston component when closing mutually to support；Specifically, piston component includes elastic component 13 and piston 14；
Elastic component 13 can be spring, and elastic component 13 is mounted in plunger shaft 15；Piston 14 is connected with elastic component 13, and a part of position
In in plunger shaft 15, another part is located at outside plunger shaft 15, and more specifically, the piston 14 of the present embodiment is far from one end of flap 2
Equipped with the positive stop end with opening limit cooperation, above-mentioned guide groove is equipped with close to one end of flap 2.
When flap 2 is opened, piston 14 pops up the buffer unit of the present embodiment under the action of elastic component 13, at this time feed liquor
Medium in nozzle 18 is entered in plunger shaft 15 by the through-hole 16, realizes accumulation of energy, and the medium in feed liquor nozzle 18 is made
For accumulation of energy medium；When flap 2 is closed, guide part contacts first with 14 guide groove of piston, and helping for flap 2 is realized under guiding role
Just, 2 deflection of flap is prevented.Compression piston 14 and elastic component 13 under the action of 2 gravity of flap and the medium power of reflux, accumulation of energy are situated between
Matter is compressed to be excluded from through-hole 16, and due to the limitation of through-hole 16, piston 14 realizes that damping action slowly bounces back, and flap 2 is in piston
Slow closure function is realized under 14 resistance.
The buffer unit of above structure is not necessarily to other resisting mediums, directly using the medium in valve body 1 as resisting medium,
Without other medium pipelines, not only cost is relatively low but also simplifies damping structure, realizes Slow Close effect also superior to single damping
The Slow Close effect of part (such as the only structure of spring and piston as piston component).
In addition, 15 size of plunger shaft is smaller, not can guarantee piston 14 due to the size limitation in feed liquor nozzle 18
Stroke, therefore, for stroke of the oversize piston 14 in plunger shaft 15, the present embodiment also improves 14 structure of piston: this
The piston 14 of embodiment is equipped with installation cavity open at one end, and 13 one end of elastic component is connected with pedestal, and the other end protrudes into installation cavity
Interior and be connected with piston 14, for image, the piston 14 of the present embodiment is similar to a tubular structure open at one end, in this way
One major part for carrying out elastic component 13 can be located in piston 14, the length of elastic component 13 can be increased, in piston 14 far from flap 2
One end be equipped with positive stop end, the maximum distance of positive stop end and above-mentioned gland 12 is the range of piston 14, such structure
14 stroke of piston is much larger than existing plunger piston, ensure that Slow Close effect.
In the description of the present invention, it is to be understood that, term " center ", "inner", "outside", etc. instructions orientation or position
Relationship is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of description of the present invention and simplification of the description, without referring to
Show or imply that signified device or element must have a particular orientation, be constructed and operated in a specific orientation, therefore cannot manage
Solution is limitation of the present invention.
In the present invention unless specifically defined or limited otherwise, term " connected ", " connection ", etc. terms should do broad sense
Understand, for example, it may be being fixedly connected, may be a detachable connection, or is integral；It can be mechanical connection, can be straight
Connect it is connected, can also be indirectly connected through an intermediary.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
The flat height of fisrt feature medium is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
Fisrt feature is directly under or diagonally below the second feature, or is merely representative of the flat height of fisrt feature medium and is less than second feature.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include at least one this feature.In the description of the present invention, the meaning of " plurality " is at least two, such as two, three
It is a etc., unless otherwise specifically defined.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of swing check valve, including valve body and it is mounted on the intracorporal rocker arm of valve and flap；The flap and the rocker arm
Be connected, and can be swung on the rocker arm, which is characterized in that the flap center of gravity be equipped with support level, the rocker arm and
Support rod is provided between the flap, described support rod one end is connected with the rocker arm, support level described in other end contact.
2. swing check valve according to claim 1, which is characterized in that the flap is set close to the side of the rocker arm
There is fluting, the fluting forms the support level.
3. swing check valve according to claim 1 or 2, which is characterized in that support level described in the support rod contact
One end be spheric end, described spheric end a part is located in the support level, and pressure ring, the flap are arranged on another part
It is socketed on the pressure ring.
4. swing check valve according to claim 1, which is characterized in that the valve body be equipped with feed liquor nozzle, it is described into
Buffer unit is installed, the flap abuts against when closing with the buffer unit, to delay the closing of the flap in liquid pipe mouth
Speed.
5. swing check valve according to claim 4, which is characterized in that the buffer unit is equipped with guide groove, described
Flap is equipped with the guide part matched with the guide groove close to the side of the buffer unit.
6. swing check valve according to claim 4 or 5, which is characterized in that the buffer unit includes pedestal and work
Plug assembly；The pedestal is mounted in feed liquor nozzle, and the pedestal is provided with plunger shaft, the base close to the side of the flap
Seat is equipped with the through-hole being connected with the plunger shaft far from the side of the flap；The piston component is mounted on the plunger shaft
Interior, the piston component part is located at outside the plunger shaft, is located at the piston with the piston component when flap is closed
It mutually supports part outside chamber.
7. swing check valve according to claim 6, which is characterized in that the piston component includes elastic component and work
Plug；The elastic component is mounted in the plunger shaft；The piston is connected with the elastic component, and a part is located at the work
Fill in intracavitary, another part is located at outside plunger shaft.
8. swing check valve according to claim 7, which is characterized in that the pedestal is set close to the side of the flap
There is accommodation groove, the opening of the accommodation groove is equipped with the gland equipped with opening, and the accommodation groove and the gland form described
Plunger shaft；The piston is equipped with the positive stop end with the opening limit cooperation far from one end of the flap.
9. swing check valve according to claim 7, which is characterized in that the piston is equipped with installation open at one end
Chamber；Described elastic component one end is connected with the pedestal, and the other end protrudes into the installation cavity and is connected with the piston.
10. swing check valve according to claim 1, which is characterized in that the rocker arm is close to the side of the flap
Equipped with positive stop lug boss, to limit hunting range of the flap on the rocker arm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910311238.9A CN109990121B (en) | 2019-04-18 | Swing check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910311238.9A CN109990121B (en) | 2019-04-18 | Swing check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109990121A true CN109990121A (en) | 2019-07-09 |
| CN109990121B CN109990121B (en) | 2024-05-17 |
Family
ID=
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2140453Y (en) * | 1992-04-10 | 1993-08-18 | 辽宁省铁岭阀门厂 | Fluid regulating stop-check valve |
| CN102003557A (en) * | 2010-11-09 | 2011-04-06 | 南通龙源电站阀门有限公司 | Adjustable high-pressure micro-resistance slow closing check valve for ultradeep coal mine |
| CN102620015A (en) * | 2010-12-30 | 2012-08-01 | 大连大高阀门有限公司 | Nuclear class 1 large caliber forged steel full circulation high-Cv value swing check valve |
| CN103775691A (en) * | 2014-01-20 | 2014-05-07 | 武汉大禹阀门股份有限公司 | Self-washing damping and wear-resistant rotation type check valve |
| CN106704648A (en) * | 2017-03-28 | 2017-05-24 | 永嘉县信诚科技服务有限公司 | Swing slow-closure check valve |
| CN206770680U (en) * | 2017-04-01 | 2017-12-19 | 苏州克莱森机械科技有限公司 | The anti-rotation structure of swing check valve flap |
| CN209818820U (en) * | 2019-04-18 | 2019-12-20 | 黑龙江北方阀业有限责任公司 | Swing check valve |
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2140453Y (en) * | 1992-04-10 | 1993-08-18 | 辽宁省铁岭阀门厂 | Fluid regulating stop-check valve |
| CN102003557A (en) * | 2010-11-09 | 2011-04-06 | 南通龙源电站阀门有限公司 | Adjustable high-pressure micro-resistance slow closing check valve for ultradeep coal mine |
| CN102620015A (en) * | 2010-12-30 | 2012-08-01 | 大连大高阀门有限公司 | Nuclear class 1 large caliber forged steel full circulation high-Cv value swing check valve |
| CN103775691A (en) * | 2014-01-20 | 2014-05-07 | 武汉大禹阀门股份有限公司 | Self-washing damping and wear-resistant rotation type check valve |
| CN106704648A (en) * | 2017-03-28 | 2017-05-24 | 永嘉县信诚科技服务有限公司 | Swing slow-closure check valve |
| CN206770680U (en) * | 2017-04-01 | 2017-12-19 | 苏州克莱森机械科技有限公司 | The anti-rotation structure of swing check valve flap |
| CN209818820U (en) * | 2019-04-18 | 2019-12-20 | 黑龙江北方阀业有限责任公司 | Swing check valve |
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