CN111173943A - Dual-control efficient check valve - Google Patents
Dual-control efficient check valve Download PDFInfo
- Publication number
- CN111173943A CN111173943A CN201911202833.5A CN201911202833A CN111173943A CN 111173943 A CN111173943 A CN 111173943A CN 201911202833 A CN201911202833 A CN 201911202833A CN 111173943 A CN111173943 A CN 111173943A
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- China
- Prior art keywords
- pipe
- communicated
- sealing
- connecting pipe
- check valve
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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.)
- Granted
Links
- 238000007789 sealing Methods 0.000 claims abstract description 66
- 238000011010 flushing procedure Methods 0.000 claims description 11
- 230000005540 biological transmission Effects 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 18
- 239000012535 impurity Substances 0.000 description 14
- 238000000034 method Methods 0.000 description 9
- 238000011001 backwashing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Images
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/04—Plug, tap, or cock filters filtering elements mounted in or on a faucet
-
- 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
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Check Valves (AREA)
Abstract
The invention relates to the technical field of valve equipment, in particular to a double-control efficient check valve; the sealing structure is added, so that the sealing performance is improved, the phenomenon that water still passes through when the valve body is not used is reduced, and the use reliability of equipment is improved; the double-control efficient check valve is provided with an output end, an input end and a sealing box, a first cavity is arranged in the sealing box, first connecting pipes are arranged at the left end and the bottom end of the sealing box respectively, a sealing block is arranged in the first cavity, a threaded rod is arranged at the top end of the sealing block, a bearing is fixedly arranged in a mounting hole, a threaded pipe is fixedly arranged in the first connecting hole, the outer side wall of the threaded pipe is connected with the inner side wall of the first connecting hole, the top end of the threaded rod penetrates through the threaded pipe in a threaded mode, a handle is fixedly arranged at the top end of the threaded rod, and a first valve is.
Description
Technical Field
The invention relates to the technical field of valve equipment, in particular to a double-control efficient check valve.
Background
As is well known, a check valve is a valve in which an opening and closing member is a circular valve flap and acts by its own weight and medium pressure to block a medium from flowing backward, has a function of blocking water flow, and is widely used in the field of valve devices; the existing check valve comprises a valve body, wherein the left end and the right end of the valve body are respectively provided with an output end and an input end; when the check valve is used, the valve body is arranged at the pipeline communication position, so that the valve body is communicated with the pipeline, and water is input from the input end of the valve body and output from the output end of the valve body; when the check valve is used, the sealing performance is poor when the valve body is not used, the phenomenon that the valve body is not tightly closed and water still passes occurs, and the use reliability of equipment is low.
Disclosure of Invention
In order to solve the technical problems, the invention provides a double-control efficient check valve which is added with a sealing structure, improves the sealing property, reduces the phenomenon that water still flows through when a valve body is not used, and improves the use reliability of equipment.
The double-control efficient check valve is provided with an output end and an input end; still include the seal box, be provided with first chamber in the seal box, seal box left end and bottom all are provided with first connecting pipe, the first connecting pipe output in bottom and first chamber bottom intercommunication, the first connecting pipe input in left side and first chamber left end intercommunication, be provided with sealed piece in the first chamber, sealed piece top is provided with the threaded rod, sealed piece top is provided with the mounting hole, the fixed bearing that is provided with of mounting hole, the threaded rod bottom insert to the bearing in and with bearing inside wall fixed connection, threaded rod bottom and sealed piece top rotatable coupling, the seal box top is provided with first connecting hole, the fixed screwed pipe that is provided with in first connecting hole, the screwed pipe is passed with first connecting hole inside wall to the screwed pipe lateral wall, the threaded rod top spiral-bar top is fixed to be provided with the handle, the first connecting pipe intercommunication of downside is provided with first valve.
The double-control efficient check valve further comprises a filter box, wherein a second cavity is arranged in the filter box, a filter plate is arranged in the second cavity, the outer side wall of the filter plate is connected with the inner side wall of the second cavity, a second connecting pipe is arranged at the top end of the filter box, the input end of the second connecting pipe is communicated with the top end of the second cavity, and a second valve is arranged in the second connecting pipe in a communicating mode.
According to the double-control efficient check valve, the bottom end of a filter box is provided with a three-way pipe, the output end of the three-way pipe is communicated with the bottom end of a second cavity, the three-way pipe is provided with two groups of output ends, a lower side pipeline and a right side pipeline of the three-way pipe are both provided with a third valve in a communicated mode, a lower side input end of the three-way pipe is provided with a third connecting pipe in a communicated mode, an output end of the second connecting pipe is provided with a fourth connecting pipe in a communicated mode, an output end of the fourth connecting pipe is communicated with an input end of the lower side first connecting pipe, an output end and an input end are respectively arranged at the left end of the third connecting pipe and the left end of the fourth connecting pipe, the left side of the filter.
The double-control efficient check valve further comprises a back flushing pipe, the back flushing pipe is communicated and arranged on the right side of the top end of the filter box, and the output end of the back flushing pipe is communicated with the right side of the top end of the second cavity.
The double-control efficient check valve further comprises a spring, wherein the spring is sleeved on the lower side of the threaded rod, and the bottom end of the spring is connected with the top end of the sealing block.
The double-control efficient check valve further comprises a sealing ring, wherein the sealing ring is fixedly arranged at the top end of the first cavity, and the inner side wall of the sealing ring is in sealing contact with the outer side wall of the threaded rod.
According to the double-control efficient check valve, the sealing layer is fixedly arranged on the outer side wall of the sealing block.
According to the double-control efficient check valve, the handle sleeve is fixedly arranged on the outer side wall of the handle.
Compared with the prior art, the invention has the beneficial effects that: when the valve body does not use, the handle rotates, handle pivoted in-process, the threaded rod rotates thereupon, threaded rod pivoted in-process is under the screw thread effect of screwed pipe, the threaded rod moves down thereupon, under the setting of bearing, the threaded rod carries out the pivoted in-process, sealed piece does not rotate thereupon, only carry out the removal of direction from top to bottom, when the threaded rod moves down, sealed piece moves down thereupon, sealed piece moves down to the bottommost back, sealed piece seals two sets of first connecting pipes, at this moment, water does not circulate, the setting of sealed piece can improve the leakproofness, reduce and still appear the phenomenon that rivers pass through when the valve body does not use, improve equipment's use reliability.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
FIG. 4 is an enlarged view of portion C of FIG. 1;
in the drawings, the reference numbers: 1. a valve body; 2. a sealing box; 3. a first chamber; 4. a first connecting pipe; 5. a sealing block; 6. a threaded rod; 7. mounting holes; 8. a bearing; 9. connecting holes; 10. a threaded pipe; 11. a handle; 12. a first valve; 13. a filter box; 14. a second chamber; 15. a filter plate; 16. a second connecting pipe; 17. a second valve; 18. a three-way pipe; 19. a third valve; 20. a third connecting pipe; 21. a fourth connecting pipe; 22. a conveying pipe; 23. a fourth valve; 25. a backwash pipe; 27. a spring; 29. a seal ring; 30. a sealing layer; 31. a handle sleeve.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
As shown in fig. 1 to 4, the double-control high-efficiency check valve of the present invention comprises a valve body 1, wherein the left end and the right end of the valve body 1 are respectively provided with an output end and an input end; the sealing box comprises a sealing box 2, a first cavity 3 is arranged in the sealing box 2, first connecting pipes 4 are arranged at the left end and the bottom end of the sealing box 2, the output end of the first connecting pipe 4 at the bottom end is communicated with the bottom end of the first cavity 3, the input end of the first connecting pipe 4 at the left side is communicated with the left end of the first cavity 3, a sealing block 5 is arranged in the first cavity 3, a threaded rod 6 is arranged at the top end of the sealing block 5, a mounting hole 7 is arranged at the top end of the sealing block 5, a bearing 8 is fixedly arranged in the mounting hole 7, the bottom end of the threaded rod 6 is inserted into the bearing 8 and is fixedly connected with the inner side wall of the bearing 8, the bottom end of the threaded rod 6 is rotatably connected with the top end of the sealing block 5, a connecting hole 9 is arranged at the top end of the sealing box 2, a threaded pipe 10, a first valve 12 is arranged on the lower first connecting pipe 4 in a communicating manner; when the valve body does not use, the handle rotates, handle pivoted in-process, the threaded rod rotates thereupon, threaded rod pivoted in-process is under the screw thread effect of screwed pipe, the threaded rod moves down thereupon, under the setting of bearing, the threaded rod carries out the pivoted in-process, sealed piece does not rotate thereupon, only carry out the removal of direction from top to bottom, when the threaded rod moves down, sealed piece moves down thereupon, sealed piece moves down to the bottommost back, sealed piece seals two sets of first connecting pipes, at this moment, water does not circulate, the setting of sealed piece can improve the leakproofness, reduce and still appear the phenomenon that rivers pass through when the valve body does not use, improve equipment's use reliability.
The double-control efficient check valve further comprises a filter box 13, wherein a second cavity 14 is formed in the filter box 13, a filter plate 15 is arranged in the second cavity 14, the outer side wall of the filter plate 15 is connected with the inner side wall of the second cavity 14, a second connecting pipe 16 is arranged at the top end of the filter box 13, the input end of the second connecting pipe 16 is communicated with the top end of the second cavity 14, and a second valve 17 is arranged in the second connecting pipe 16 in a communicating manner; there are more impurity in carrying out the use in the water, the existence of more impurity causes the jam to the pipeline more easily, causes the jam to the valve body simultaneously, causes the influence to the use of valve body, and water transmission is to the second chamber after, and the filter can filter impurity, reduces impurity transmission to the valve body in, reduces the jam phenomenon of impurity to the valve body.
According to the double-control efficient check valve, the bottom end of a filter box 13 is provided with a three-way pipe 18, the output end of the three-way pipe 18 is communicated with the bottom end of a second cavity 14, the three-way pipe 18 is provided with two groups of output ends, a lower side pipeline and a right side pipeline of the three-way pipe 18 are both communicated with a third valve 19, a lower side input end of the three-way pipe 18 is communicated with a third connecting pipe 20, an output end of a second connecting pipe 16 is communicated with a fourth connecting pipe 21, the output end of the fourth connecting pipe 21 is communicated with the input end of a lower side first connecting pipe 4, the left end of the third connecting pipe 20 and the left end of the fourth connecting pipe 21 are respectively provided with an output end and an input end, the left side of the filter box 13 is provided with a transmission pipe 22, the input end and the output end of the; when the valve body uses, the fourth valve that will transmit the setting of pipe intercommunication is closed, the third valve with the three-way pipe right side is closed, the downside input of water three-way pipe this moment transmits to the second intracavity, when impurity is too much, close the third valve of second valve and three-way pipe downside this moment after, open the fourth valve, water upwards transmits from the transmission pipe, the impurity of filter bottom is downward precipitation under the action of gravity, and export from the right side output of three-way pipe, reduce the jam phenomenon of impurity to the filter.
The double-control efficient check valve further comprises a back-flushing pipe 25, wherein the back-flushing pipe 25 is communicated with and arranged on the right side of the top end of the filter box 13, and the output end of the back-flushing pipe 25 is communicated with the right side of the top end of the second cavity 14; when the filter plate is maintained, an external water source is communicated with the input end of the backwashing pipe, water is transmitted from top to bottom and backwashing is carried out on the filter plate, the amount of impurities attached to the bottom end of the filter plate is reduced, and the service life of the filter plate is prolonged.
The double-control efficient check valve further comprises a spring 27, wherein the spring 27 is sleeved at the lower side of the threaded rod 6, and the bottom end of the spring 27 is connected with the top end of the sealing block 5; when the threaded rod moves downwards, the spring extends gradually, when the sealing block reaches the bottommost end, the spring has downward force on the sealing block, and the sealing performance of the sealing block on the two groups of first connecting pipes can be improved.
The double-control efficient check valve further comprises a sealing ring 29, wherein the sealing ring 29 is fixedly arranged at the top end of the first cavity 3, and the inner side wall of the sealing ring 29 is in sealing contact with the outer side wall of the threaded rod 6; the sealing performance of the connection position of the connection hole and the threaded pipe can be improved by arranging the sealing ring, and meanwhile, the sealing performance between the threaded rod and the threaded pipe is improved.
According to the double-control efficient check valve, the sealing layer 30 is fixedly arranged on the outer side wall of the sealing block 5; the sealing layer can improve the sealing performance between the sealing block and the two groups of first connecting pipes.
According to the double-control efficient check valve, the outer side wall of the handle 11 is fixedly provided with a handle sleeve 31; the arrangement of the handle sleeve can improve the friction force of the outer side wall of the handle.
The invention relates to a double-control high-efficiency check valve, which is characterized in that when a valve body is used, a fourth valve communicated with a transmission pipe is closed, a third valve on the right side of a three-way pipe is closed, the lower side input end of the three-way pipe is transmitted into a second cavity, when impurities are excessive, the fourth valve is opened after the second valve and the third valve on the lower side of the three-way pipe are closed, water is transmitted upwards from the transmission pipe, a filter plate can filter the impurities and reduce the transmission of the impurities into the valve body, when the valve body is not used, the impurities at the bottom end of the filter plate are precipitated downwards under the action of gravity and are output from the right side output end of the three-way pipe, when the filter plate is maintained, an external water source is communicated with the input end of a back flushing pipe, the water is transmitted downwards from the top and is used for back flushing the filter plate, the amount of the impurities adhered to the, the threaded rod rotates along with the handle in the rotating process, the threaded rod moves downwards along with the threaded rod under the action of the threads of the threaded pipe in the rotating process of the threaded rod, the sealing block does not rotate along with the threaded rod in the rotating process of the bearing, only moves in the vertical direction, the sealing block moves downwards along with the threaded rod when moving downwards, the sealing block seals the two groups of first connecting pipes after the sealing block moves downwards to the bottommost end, at the moment, water does not circulate, the sealing block can improve the sealing performance, and the phenomenon that water still flows through when the valve body is not used is reduced,
the installation mode, the connection mode or the arrangement mode of the double-control efficient check valve are common mechanical modes, and the double-control efficient check valve can be implemented as long as the beneficial effects of the double-control efficient check valve are achieved.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A double-control efficient check valve comprises a valve body (1), wherein the left end and the right end of the valve body (1) are respectively provided with an output end and an input end; the device is characterized by further comprising a sealing box (2), a first cavity (3) is arranged in the sealing box (2), first connecting pipes (4) are arranged at the left end and the bottom end of the sealing box (2), the output end of the first connecting pipe (4) at the bottom end is communicated with the bottom end of the first cavity (3), the input end of the first connecting pipe (4) at the left side is communicated with the left end of the first cavity (3), a sealing block (5) is arranged in the first cavity (3), a threaded rod (6) is arranged at the top end of the sealing block (5), a mounting hole (7) is arranged at the top end of the sealing block (5), a bearing (8) is fixedly arranged in the mounting hole (7), the bottom end of the threaded rod (6) is inserted into the bearing (8) and is fixedly connected with the inner side wall of the bearing (8), the bottom end of the threaded rod (6) is rotatably connected with the top end of the sealing block (5), a connecting, the outer side wall of the threaded pipe (10) is connected with the inner side wall of the connecting hole (9), the top end of the threaded rod (6) penetrates through the threaded pipe (10) in a threaded mode, a handle (11) is fixedly arranged at the top end of the threaded rod (6), and the first connecting pipe (4) on the lower side is communicated with a first valve (12).
2. The high-efficiency check valve with double control as claimed in claim 1, further comprising a filter box (13), wherein a second chamber (14) is arranged in the filter box (13), a filter plate (15) is arranged in the second chamber (14), the outer side wall of the filter plate (15) is connected with the inner side wall of the second chamber (14), a second connecting pipe (16) is arranged at the top end of the filter box (13), the input end of the second connecting pipe (16) is communicated with the top end of the second chamber (14), and a second valve (17) is arranged in the second connecting pipe (16).
3. A double-control high-efficiency check valve as claimed in claim 2, wherein the bottom end of the filtering tank (13) is provided with a three-way pipe (18), the output end of the three-way pipe (18) is communicated with the bottom end of the second chamber (14), the three-way pipe (18) is provided with two sets of output ends, the lower side pipeline and the right pipeline of the three-way pipe (18) are both communicated with a third valve (19), the lower side input end of the three-way pipe (18) is communicated with a third connecting pipe (20), the output end of the second connecting pipe (16) is communicated with a fourth connecting pipe (21), the output end of the fourth connecting pipe (21) is communicated with the input end of the lower side first connecting pipe (4), the left end of the third connecting pipe (20) and the left end of the fourth connecting pipe (21) are respectively provided with an output end and an input end, the left side of the filtering tank (13) is provided with a transmission pipe (22), and the input end and the output end And the transmission pipe (22) is communicated with a fourth valve (23).
4. A double-control high-efficiency check valve as claimed in claim 3, further comprising a back-flushing pipe (25), wherein the back-flushing pipe (25) is communicated with the right side of the top end of the filter box (13), and the output end of the back-flushing pipe (25) is communicated with the right side of the top end of the second chamber (14).
5. A double-control high-efficiency check valve as claimed in claim 4, further comprising a spring (27), wherein the spring (27) is sleeved on the lower side of the threaded rod (6), and the bottom end of the spring (27) is connected with the top end of the sealing block (5).
6. A double-control high-efficiency check valve as claimed in claim 5, further comprising a sealing ring (29), wherein the sealing ring (29) is fixedly arranged at the top end of the first cavity (3), and the inner side wall of the sealing ring (29) is in sealing contact with the outer side wall of the threaded rod (6).
7. A double control high efficiency check valve as claimed in claim 6 wherein the sealing block (5) is fixedly provided with a sealing layer (30) on the outer side wall.
8. A double control high efficiency check valve as claimed in claim 7, wherein a handle sleeve (31) is fixedly provided on the outer side wall of the handle (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202833.5A CN111173943B (en) | 2019-11-29 | 2019-11-29 | Dual-control efficient check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911202833.5A CN111173943B (en) | 2019-11-29 | 2019-11-29 | Dual-control efficient check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111173943A true CN111173943A (en) | 2020-05-19 |
| CN111173943B CN111173943B (en) | 2023-08-08 |
Family
ID=70656218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911202833.5A Active CN111173943B (en) | 2019-11-29 | 2019-11-29 | Dual-control efficient check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111173943B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206972984U (en) * | 2017-05-15 | 2018-02-06 | 钟东琴 | A kind of filtering type damping check-valves |
| CN207195762U (en) * | 2017-09-14 | 2018-04-06 | 永嘉县威尔森阀门有限公司 | It is a kind of can manual-lock bellows check-valves |
| CN207500557U (en) * | 2017-11-30 | 2018-06-15 | 大连埃斯流体技术有限公司 | A kind of unitized filter check valve |
-
2019
- 2019-11-29 CN CN201911202833.5A patent/CN111173943B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206972984U (en) * | 2017-05-15 | 2018-02-06 | 钟东琴 | A kind of filtering type damping check-valves |
| CN207195762U (en) * | 2017-09-14 | 2018-04-06 | 永嘉县威尔森阀门有限公司 | It is a kind of can manual-lock bellows check-valves |
| CN207500557U (en) * | 2017-11-30 | 2018-06-15 | 大连埃斯流体技术有限公司 | A kind of unitized filter check valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111173943B (en) | 2023-08-08 |
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