CN110617351A - Low-resistance backflow preventer - Google Patents
Low-resistance backflow preventer Download PDFInfo
- Publication number
- CN110617351A CN110617351A CN201910980283.3A CN201910980283A CN110617351A CN 110617351 A CN110617351 A CN 110617351A CN 201910980283 A CN201910980283 A CN 201910980283A CN 110617351 A CN110617351 A CN 110617351A
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- China
- Prior art keywords
- water
- plate
- valve seat
- valve body
- outlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 124
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002699 waste material 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
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/44—Details of seats or valve members of double-seat valves
-
- 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
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
-
- 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
- F16K15/066—Check valves with guided rigid valve members with guided stems the valve being loaded by a spring with a plurality of valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/18—Check valves with actuating mechanism; Combined check valves and actuated valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention provides a low-resistance backflow preventer, which relates to the field of check valves and comprises a valve body shell, wherein one end of the valve body shell is provided with a water inlet, a first valve seat is arranged at the water inlet, the other end of the valve body shell is provided with a water outlet, a second valve seat is arranged at the water outlet, a supporting slide rod is arranged between the first valve seat and the second valve seat, and a vertical water stop plate is arranged on the supporting slide rod; an outlet pressing plate is arranged on one side of the limiting plate, an outlet cover is installed at the tail end of the supporting sliding rod, and a horizontal water stop plate is arranged on the peripheral side face of the outlet cover away from the water outlet. According to the invention, through the arrangement of the vertical water stop plate and the horizontal water stop plate and the double-channel sealing structure, backflow can be well prevented, and through the arrangement of the large spring and the small spring, the vertical water stop plate is tightly combined with the sealing baffle plate, and the horizontal water stop plate is tightly combined with the outlet pressing plate.
Description
Technical Field
The invention relates to the field of check valves, in particular to a low-resistance backflow preventer.
Background
The backflow preventer is a novel hydraulic control device which is developed according to the current water supply pipe network of China, particularly under the condition that the backflow pollution of the domestic drinking water pipeline is serious and no device for effectively preventing the backflow pollution exists, and can strictly limit the water in the pipeline to flow in one direction only.
At present common backflow preventer can have the leakproofness poor, takes place the phenomenon of quality of water refluence, and along with the increase of backflow preventer service life, some closely consolidate the position and can begin to appear becoming flexible simultaneously, and great fluctuation can appear in valve front end pressure sometimes, and the above circumstances all can cause the sluicing phenomenon. Most products in the current market are difficult to avoid.
Disclosure of Invention
The invention aims to provide a low-resistance backflow preventer to solve the technical problems.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a low resistance backflow preventer, includes the valve body shell, its characterized in that:
a water inlet is formed in one end of the valve body shell, a first valve seat is arranged at the water inlet, a water outlet is formed in the other end of the valve body shell, a second valve seat is arranged at the water outlet, a supporting slide rod is horizontally arranged in the middle of the first valve seat and the second valve seat and is in sliding connection with the first valve seat and the second valve seat, a vertical water stop plate is fixedly arranged on one side, close to the first valve seat, of the supporting slide rod, an inlet pad is arranged on one side, close to the water inlet, of the vertical water stop plate, an inlet pressing plate is arranged on the surface of the inlet pad, and a sealing baffle is arranged on the side;
one side that the delivery port was kept away from to the second valve seat is provided with the limiting plate, the inner wall fixed connection of limiting plate and valve body shell, and the cover has big spring on the support slide bar between limiting plate and the vertical stagnant water board, and the limiting plate is close to delivery port one side and is provided with the export clamp plate, and the surface of export clamp plate is provided with the export pad, the vertical fixed mounting in end that supports the slide bar has the export lid, and the delivery port direction is kept away from to the week side of export lid and is provided with horizontal stagnant water board, the cover has little spring on the support slide bar between second. Through the setting of vertical stagnant water board and horizontal stagnant water board, double seal structure, the backflow that prevents that can be fine, through the setting of big spring and little spring, make when water pressure does not reach the definite value, big spring and little spring can the reconversion, make vertical stagnant water board and seal flap combine closely, horizontal stagnant water board and export clamp plate combine closely, accomplish the sealed of backflow preventer, support the setting of slide bar, when making vertical stagnant water board free slip, fixed export lid and horizontal stagnant water board, big spring and little spring also can avoid valve front end pressure can fluctuate and cause the sluicing phenomenon to appear.
Preferably, the first valve seat and the second valve seat are fixedly installed on the valve body shell, and water flow passing is not influenced.
Preferably, the vertical water stop plate is tightly combined with the sealing baffle when water is not supplied, and the horizontal water stop plate is tightly combined with the outlet pad when water is not supplied.
Preferably, the lateral wall below of valve body shell is run through the inside outlet that is provided with of valve body, and the lower extreme of outlet is connected with the drainer, and both ends are rotated through the coupling and are connected with the stainless steel pipe about the drainer, and the drainer is provided with the drain valve with the outlet position. The arrangement of the water outlet can discharge the liquid in the valve body when the backflow preventer is in a sealed state, and the arrangement of the water discharge valve can close the water discharge valve when water flows through the valve body shell, so that the water flow is prevented from being discharged from the water outlet.
Preferably, the minimum pressure for the deformation of the large spring and the small spring is 1.03 kpa.
Preferably, a 0-shaped ring is arranged at the joint of the supporting sliding rod, the vertical water stop plate and the limiting plate.
Preferably, the outer side wall of the horizontal water stop plate is in sliding connection with the inner wall of the water outlet, and a sealing ring is arranged on a contact surface.
The invention has the beneficial effects that:
according to the backflow preventer, the vertical water stop plate and the horizontal water stop plate are arranged, the double-channel sealing structure can well prevent backflow, the large spring and the small spring can restore to the original state through the arrangement of the large spring and the small spring when the water pressure does not reach a fixed value, the vertical water stop plate is tightly combined with the sealing baffle, the horizontal water stop plate is tightly combined with the outlet pressing plate to complete the sealing of the backflow preventer, the sliding rod is supported to be arranged, the outlet cover and the horizontal water stop plate are fixed while the vertical water stop plate freely slides, the water outlet is formed, liquid in the valve body can be discharged when the backflow preventer is in a sealing state, and the water discharge valve can be closed when water flows pass through the valve body shell and is prevented from being discharged from the water outlet. This practical structure is simple, can the leakproofness good, can effectively avoid the phenomenon of quality of water refluence, prevents the waste of water resource, and is safe effective, and the practicality is high.
Drawings
FIG. 1 is a schematic sectional view of a valve body housing in a water-through state according to the present invention;
FIG. 2 is a schematic cross-sectional view of the valve body housing in a sealed condition of the present invention;
FIG. 3 is a schematic view of a vertical water stop plate structure according to the present invention;
FIG. 4 is a schematic diagram of a limiting plate according to the present invention;
FIG. 5 is a schematic side view of the present invention;
reference numerals: 1-a valve body housing; 2-water inlet; 3-water outlet; 4-a first valve seat; 5-a second valve seat; 6-supporting the sliding rod; 7-vertical water stop plate; 8-inlet pad; 9-inlet platen; 10-sealing the baffle; 11-a limiting plate; 12-large spring; 13-an outlet platen; 14-outlet pad; 15-an outlet cover; 16-horizontal water stop plate; 17-a small spring; 18-a drain outlet; 19-a drainer; 20-pipe joint; 21-stainless steel tube; 22-a drain valve.
Detailed Description
In order to make the technical means, the original characteristics, the achieved purposes and the effects of the invention easily understood, the invention is further described below with reference to the specific embodiments and the attached drawings, but the following embodiments are only the preferred embodiments of the invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative efforts belong to the protection scope of the present invention.
Specific embodiments of the present invention are described below with reference to the accompanying drawings.
Example 1
As shown in fig. 1-5, a low resistance backflow preventer comprises a valve body housing 1, wherein one end of the valve body housing 1 is provided with a water inlet 2, a first valve seat 4 is arranged at the water inlet 2, the other end of the valve body housing 1 is provided with a water outlet 3, the water outlet 3 is provided with a second valve seat 5, a support slide bar 6 is horizontally arranged at the middle position of the first valve seat 4 and the second valve seat 5, the support slide bar 6 is in sliding connection with the first valve seat 4 and the second valve seat 5, a vertical water stop plate 7 is fixedly arranged on one side of the support slide bar 6 close to the first valve seat 4, an inlet gasket 8 is arranged on one side of the vertical water stop plate 7 close to the water inlet 2, an inlet pressure plate 9 is arranged on the surface of the inlet gasket 8, and a;
one side of the second valve seat 5, which is far away from the water outlet 3, is provided with a limiting plate 11, the limiting plate 11 is fixedly connected with the inner wall of the valve body shell 1, a supporting slide bar 6 between the limiting plate 11 and the vertical water stop plate 7 is sleeved with a large spring 12, one side of the limiting plate 11, which is close to the water outlet 3, is provided with an outlet pressing plate 13, the surface of the outlet pressing plate 13 is provided with an outlet pad 14, the tail end of the supporting slide bar 6 is vertically and fixedly provided with an outlet cover 15, the peripheral side of the outlet cover 15 is far away from the water outlet 3 and is provided with a horizontal water stop plate 16, and the supporting slide.
The working principle is as follows: rivers reach vertical sealing plate 7 through water inlet 2, if the pressure of rivers is less, when being less than 1.03kpa, under the spring action of big spring 12, vertical sealing plate 7 is in the same place with seal baffle 10's right-hand member is tight, horizontal sealing plate 16 tightly presses on the export clamp plate 13 of limiting plate 11 one side, hinder the circulation of rivers, when the pressure of rivers is greater than 1.03kpa, rivers are to the pressure that vertical sealing plate 7 was applyed, make vertical sealing plate 7 drive support slide bar 6 wholly slide right, meanwhile, support the export lid 15 of slide bar 6 right-hand member also can be driven and slide right, export lid 15 a week horizontal sealing plate 16 will separate with the export pad 14 on export clamp plate 13 surface, rivers alright at this moment with can be smooth 2 inside reaching valve body shell 1 from the water inlet, then discharge from delivery port 3.
When the water pressure of water inlet 2 is less, the water pressure that is located delivery port 3 is great, water can follow delivery port 3 flow direction water inlet 2, the right side of vertical sealing plate 7 will receive the pressure that comes from the backward flow water this moment, the resilience of big spring 12 and little spring 17 is gone up in the cooperation, make vertical sealing plate 7 drive support slide bar 6 whole move left, until vertical sealing plate 7 and baffle 10 combine together, horizontal sealing plate 16 tightly presses on the export clamp plate 13 of limiting plate 11 one side, the twice seal structure this moment, seal the way of backward flow completely, make water can't follow the flow direction water inlet 2 of delivery port 3.
Example 2
As shown in fig. 1-5, a low resistance backflow preventer comprises a valve body housing 1, wherein one end of the valve body housing 1 is provided with a water inlet 2, a first valve seat 4 is arranged at the water inlet 2, the other end of the valve body housing 1 is provided with a water outlet 3, the water outlet 3 is provided with a second valve seat 5, a support slide bar 6 is horizontally arranged at the middle position of the first valve seat 4 and the second valve seat 5, the support slide bar 6 is in sliding connection with the first valve seat 4 and the second valve seat 5, a vertical water stop plate 7 is fixedly arranged on one side of the support slide bar 6 close to the first valve seat 4, an inlet gasket 8 is arranged on one side of the vertical water stop plate 7 close to the water inlet 2, an inlet pressure plate 9 is arranged on the surface of the inlet gasket 8, and a;
one side of the second valve seat 5, which is far away from the water outlet 3, is provided with a limiting plate 11, the limiting plate 11 is fixedly connected with the inner wall of the valve body shell 1, a supporting slide bar 6 between the limiting plate 11 and the vertical water stop plate 7 is sleeved with a large spring 12, one side of the limiting plate 11, which is close to the water outlet 3, is provided with an outlet pressing plate 13, the surface of the outlet pressing plate 13 is provided with an outlet pad 14, the tail end of the supporting slide bar 6 is vertically and fixedly provided with an outlet cover 15, the peripheral side of the outlet cover 15 is far away from the water outlet 3 and is provided with a horizontal water stop plate 16, and the supporting slide.
A water outlet 18 is arranged at the lower part of the side wall of the valve body shell 1 penetrating the valve body, a drainer 19 is connected with the lower end of the water outlet 18, stainless steel pipes 21 are rotatably connected with the left end and the right end of the drainer 19 through pipe joints 20, and a drain valve 22 is arranged at the positions of the drainer 19 and the water outlet 18.
When the inside of whole backflow preventer does not have rivers to flow, ponding can exist in the inside of valve body shell 1, if ponding untimely discharge, there is more pollutant in the aquatic of refluence and can be rotten in the backflow preventer inside, open drain valve 22, the inside water of backflow preventer passes through outlet 18 and reachs drainer 19, rotate nonrust steel pipe 21 to the position that needs through swivel coupling 20, get rid of the inside ponding of backflow preventer, the whole back of discharging of water, close drain valve 22, swivel coupling 20 is up to nonrust steel pipe 21 and is located the lateral wall of valve body shell 1.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The utility model provides a low resistance backflow preventer, includes valve body shell (1), its characterized in that:
a water inlet (2) is formed in one end of the valve body shell (1), a first valve seat (4) is arranged at the water inlet (2), a water outlet (3) is formed in the other end of the valve body shell (1), a second valve seat (5) is arranged at the water outlet (3), a supporting slide rod (6) is horizontally arranged in the middle of the first valve seat (4) and the second valve seat (5), the supporting slide rod (6) is connected with the first valve seat (4) and the second valve seat (5) in a sliding mode, a vertical water stop plate (7) is fixedly arranged on one side, close to the first valve seat (4), of the supporting slide rod (6), an inlet pad (8) is arranged on one side, close to the water inlet (2), of the vertical water stop plate (7), an inlet pressure plate (9) is arranged on the surface of the inlet pad (8), and a sealing baffle plate (10);
one side that delivery port (3) were kept away from in second disk seat (5) is provided with limiting plate (11), and the cover has big spring (12) on limiting plate (11) and the inner wall fixed connection of valve body shell (1), limiting plate (11) and vertical sealing-up plate (7) support slide bar (6), and limiting plate (11) are close to delivery port (3) one side and are provided with export clamp plate (13), and the surface of export clamp plate (13) is provided with out mouthful pad (14), the vertical fixed mounting in end that supports slide bar (6) has export lid (15), and the week side of export lid (15) is kept away from delivery port (3) direction and is provided with horizontal sealing-up plate (16), the cover has little spring (17) on support slide bar (6) between second disk seat (5) and export lid (15).
2. A low resistance backflow preventer as claimed in claim 1, wherein: the first valve seat (4) and the second valve seat (5) are fixedly mounted with the valve body shell (1), and water flow passing is not influenced.
3. A low resistance backflow preventer as claimed in claim 1, wherein: the vertical water stop plate (7) is tightly combined with the sealing baffle (10) when water is not introduced, and the horizontal water stop plate (16) is tightly combined with the outlet pad (14) when water is not introduced.
4. A low resistance backflow preventer as claimed in claim 1, wherein: the water draining device is characterized in that a water draining port (18) penetrates through the valve body from the lower portion of the side wall of the valve body shell (1), a water draining device (19) is connected to the lower end of the water draining port (18), stainless steel pipes (21) are rotatably connected to the left end and the right end of the water draining device (19) through pipe joints (20), and water draining valves (22) are arranged at the positions of the water draining device (19) and the water draining port (18).
5. A low resistance backflow preventer as claimed in claim 1, wherein: the minimum pressure of deformation of the large spring (12) and the small spring (17) is 1.03 kpa.
6. A low resistance backflow preventer as claimed in claim 1, wherein: and a 0-shaped ring is arranged at the joint of the support sliding rod (6), the vertical water stop plate (7) and the limiting plate (11).
7. A low resistance backflow preventer as claimed in claim 1, wherein: the outer side wall of the horizontal water stop plate (16) is connected with the inner wall of the water outlet (3) in a sliding mode, and a sealing ring is arranged on the contact surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980283.3A CN110617351A (en) | 2019-10-15 | 2019-10-15 | Low-resistance backflow preventer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910980283.3A CN110617351A (en) | 2019-10-15 | 2019-10-15 | Low-resistance backflow preventer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110617351A true CN110617351A (en) | 2019-12-27 |
Family
ID=68925842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910980283.3A Pending CN110617351A (en) | 2019-10-15 | 2019-10-15 | Low-resistance backflow preventer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110617351A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628426A (en) * | 2020-12-24 | 2021-04-09 | 牡丹江石油工具有限责任公司 | Check valve for petroleum and natural gas drilling |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096855A (en) * | 2007-07-20 | 2008-01-02 | 陈仁德 | Water source automatic switchover device |
| US20090151796A1 (en) * | 2007-10-29 | 2009-06-18 | Buchtel Michael E | Fluid Level Control Toggle Valve Device and Method |
| CN101818822A (en) * | 2010-05-14 | 2010-09-01 | 厦门松霖科技有限公司 | Backflow preventing mechanism applied in field of bath |
| DE202017106212U1 (en) * | 2017-02-28 | 2017-10-19 | Fujian Xihe Sanitary Ware Technology Co., Ltd | Valve |
| CN206682372U (en) * | 2017-04-11 | 2017-11-28 | 上海欧特莱阀门机械有限公司 | A kind of low resistance force counter flow stop |
| CN210859924U (en) * | 2019-10-15 | 2020-06-26 | 铜陵市兴达阀门总厂 | Low-resistance backflow preventer |
-
2019
- 2019-10-15 CN CN201910980283.3A patent/CN110617351A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101096855A (en) * | 2007-07-20 | 2008-01-02 | 陈仁德 | Water source automatic switchover device |
| US20090151796A1 (en) * | 2007-10-29 | 2009-06-18 | Buchtel Michael E | Fluid Level Control Toggle Valve Device and Method |
| CN101818822A (en) * | 2010-05-14 | 2010-09-01 | 厦门松霖科技有限公司 | Backflow preventing mechanism applied in field of bath |
| DE202017106212U1 (en) * | 2017-02-28 | 2017-10-19 | Fujian Xihe Sanitary Ware Technology Co., Ltd | Valve |
| CN206682372U (en) * | 2017-04-11 | 2017-11-28 | 上海欧特莱阀门机械有限公司 | A kind of low resistance force counter flow stop |
| CN210859924U (en) * | 2019-10-15 | 2020-06-26 | 铜陵市兴达阀门总厂 | Low-resistance backflow preventer |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112628426A (en) * | 2020-12-24 | 2021-04-09 | 牡丹江石油工具有限责任公司 | Check valve for petroleum and natural gas drilling |
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