CN109404567B - Three-way electromagnetic valve - Google Patents
Three-way electromagnetic valve Download PDFInfo
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- CN109404567B CN109404567B CN201710706129.8A CN201710706129A CN109404567B CN 109404567 B CN109404567 B CN 109404567B CN 201710706129 A CN201710706129 A CN 201710706129A CN 109404567 B CN109404567 B CN 109404567B
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- valve
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- electromagnetic valve
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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
- 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
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
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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
- 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
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/029—Electromagnetically actuated valves
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0675—Electromagnet aspects, e.g. electric supply therefor
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to a fluid control accessory, in particular to a three-way electromagnetic valve, and belongs to the field of fluid control. The invention provides a three-way electromagnetic valve, aiming at overcoming the technical problems of more three-way valve interfaces and complex pipelines in the prior art. The invention provides a three-way electromagnetic valve, wherein an inlet, a first outlet and a second outlet are arranged on a valve seat, the first outlet and the second outlet are communicated with the inlet through a fluid channel, the valve seat is also provided with an electromagnetic valve and a one-way valve, the electromagnetic valve controls whether the inlet is communicated with the first outlet or not, the one-way valve controls whether the inlet is communicated with the second outlet or not, the one-way valve has a reverse cut-off function, when the fluid pressure at the second outlet is greater than that at the inlet, the one-way valve is cut off reversely, fluid series flow can be effectively avoided, and the service performance of the electromagnetic valve is optimized. The three-way electromagnetic valve is simple in structure, small in size and applicable to a use environment with a small installation space, and has good universality.
Description
Technical Field
The invention relates to a fluid control accessory, in particular to a three-way electromagnetic valve, and belongs to the field of fluid control.
Background
The fluid generally refers to gas or liquid, and is widely applied to the fields of refrigeration systems, pneumatics, hydraulics and the like. When the fluid is actually applied, parameters such as pressure, flow direction and the like of the fluid need to be controlled, and therefore various valve bodies, such as electromagnetic valves, one-way valves, three-way valves and the like, are rapidly developed.
The three-way valve in the prior art has wide application when correspondingly controlling the fluid. In practical applications, the three-way valve is generally required to have a reverse cut-off function, i.e., the fluid flowing through the three-way valve should not be in series flow. In order to realize the function, the three-way valve in the prior art has multiple interfaces and complex pipelines, so that the volume of the three-way valve is large, and the three-way valve is not beneficial to relevant application of the three-way valve.
Disclosure of Invention
The invention provides a three-way electromagnetic valve, aiming at overcoming the technical problems of more three-way valve interfaces and complex pipelines in the prior art.
In order to solve the technical problems, the invention adopts the following technical scheme: a three-way electromagnetic valve comprises a valve seat, wherein a fluid channel is arranged in the valve seat, and an inlet communicated with the fluid channel is arranged on the valve seat;
the valve seat is also provided with a first outlet and a second outlet, and the first outlet and the second outlet are communicated with the inlet through the fluid channel;
the valve seat is provided with an electromagnetic valve for controlling the connection between the inlet and the first outlet, and the fluid pressure at the first outlet is smaller than that at the inlet;
the valve seat is also provided with a one-way valve for controlling the connection between the inlet and the second outlet, the one-way valve is positively communicated when the fluid pressure at the second outlet is smaller than that at the inlet, and the one-way valve is reversely closed when the fluid pressure at the second outlet is larger than that at the inlet.
According to the technical scheme, the valve seat is provided with the inlet, the first outlet and the second outlet are communicated with the inlet through the fluid channel, the valve seat is further provided with the electromagnetic valve and the one-way valve, the electromagnetic valve controls whether the inlet is communicated with the first outlet or not, the one-way valve controls whether the inlet is communicated with the second outlet or not, the one-way valve has a reverse stopping function, when the fluid pressure at the second outlet is larger than that at the inlet, the one-way valve stops reversely, fluid series flow can be effectively avoided, and the using performance of the electromagnetic valve is optimized.
The three-way electromagnetic valve is simple in structure, only has three interfaces, and is simple to arrange with a pipeline connected with the three-way electromagnetic valve, and the three-way electromagnetic valve has a small size, can be suitable for a use environment with a small installation space, and has good universality.
In an alternative arrangement, the one-way valve comprises a piston member and a valve cover, a guide formation for guiding the piston member being engaged on the valve cover, the guide formation having a first guide surface thereon, and the piston member having a second guide surface thereon which contacts the first guide surface. The guide structure is mainly used for guiding the piston component, the scheme enables the piston component to be high in moving precision in the moving process, the one-way valve is not prone to failure, and the stability of the three-way electromagnetic valve is improved.
In an alternative, the guide structure is cylindrical, and the first guide surface is an inner wall of the guide structure. This scheme has improved guide structure direction performance, and then has improved the stability ability of three solenoid valve in the use.
In an alternative scheme, a fixed cavity for fixing the valve cover is arranged on the valve seat, and a balance hole for communicating an inner cavity of the guide structure with the fixed cavity is formed in the guide structure. The arrangement of the balance hole enables the piston component to act reliably, and stability of the one-way valve in the use process is improved.
In an alternative, the valve cover is connected in the fixing cavity through threads. The one-way valve is convenient to install and is beneficial to maintenance of the three-way electromagnetic valve.
In an optional scheme, the electromagnetic valve is a normally open electromagnetic valve; or the electromagnetic valve is a normally closed electromagnetic valve. The electromagnetic valve has two specifications which can be selected, the three-way electromagnetic valve is convenient to maintain, and the service performance of the three-way electromagnetic valve is optimized.
Alternatively, the axis of the second outlet is perpendicular to the axis of the fluid passage. The volume of the valve seat is reduced, the whole volume of the three-way electromagnetic valve is further reduced, and the general performance of the three-way electromagnetic valve is optimized.
Alternatively, the first and second outlets are both located on the same side of the valve seat. The pipeline connected with the three-way electromagnetic valve is simple and clear in layout, and the three-way electromagnetic valve is convenient to install.
In an alternative, the solenoid valve includes a valve cover member that is fixed to the valve seat by screws. The solenoid valve is convenient to maintain.
In an alternative, the axis of the inlet is coaxial with the axis of the fluid passageway. The structure of the three-way electromagnetic valve is simplified, and the three-way electromagnetic valve is convenient to maintain.
Compared with the prior art, the three-way electromagnetic valve provided by the invention has the following advantages:
1. the three-way electromagnetic valve controls the on-off of the inlet and the first outlet by the electromagnetic valve, controls the on-off of the inlet and the second outlet by the one-way valve, and stops in the reverse direction when the fluid pressure at the second outlet is larger than that at the inlet, so that fluid streaming can be effectively avoided, and the service performance of the three-way electromagnetic valve is optimized.
2. The three-way electromagnetic valve is simple in structure and only provided with the inlet, the first outlet and the second outlet, and the scheme enables a pipeline connected with the three-way electromagnetic valve to be simple and facilitates the arrangement or maintenance of the pipeline.
3. The three-way valve is simple in structure, so that the three-way electromagnetic valve has a small size, the three-way electromagnetic valve can adapt to different installation environments, and the three-way electromagnetic valve has good universality.
Drawings
The following drawings are only used for helping those skilled in the art to understand the technical scheme of the present invention, and are not intended to limit the present invention, and those skilled in the art can obtain other drawings based on the technical scheme of the present invention.
FIG. 1 is a cross-sectional view of a three-way solenoid valve of the present invention;
FIG. 2 is a cross-sectional view taken at D-D of FIG. 1;
FIG. 3 is a cross-sectional view taken at E-E of FIG. 1;
FIG. 4 is an isometric view of a three-way solenoid valve of the present invention.
Detailed Description
The three-way solenoid valve of the present invention will be further described with reference to the accompanying drawings. The following examples are intended only to aid those skilled in the art in understanding the present invention and are not intended to limit the invention thereto.
The three-way electromagnetic valve in the text refers to a valve body device comprising a valve seat 1, an electromagnetic valve 6, a one-way valve 7 and the like;
the electromagnetic valve 6 is a valve body device for controlling the on-off of the inlet 3 and the first outlet 4, and the electromagnetic valve 6 is a common valve body device in the prior art.
As shown in fig. 1, 2, 3 and 4, a three-way electromagnetic valve includes a valve seat 1, a fluid passage 2 is provided in the valve seat 1, and an inlet 3 communicated with the fluid passage 2 is provided on the valve seat 1; the inlet 3 refers to a structure for allowing fluid to enter the fluid channel 2, the inlet 3 can be separately arranged, and the inlet 3 can also be a part of the fluid channel 2;
as shown in fig. 1 and 3, a first outlet 4 and a second outlet 5 are further provided on the valve seat 1, and both the first outlet 4 and the second outlet 5 are communicated with the inlet 3 through the fluid passage 2; the first outlet 4 and the second outlet 5 refer to structures for discharging the fluid in the fluid channel 2, and the inlet 3, the fluid channel 2, the first outlet 4 and the second outlet 5 can be manufactured by casting or removing materials;
as shown in fig. 1 and 3, the valve seat 1 is provided with a solenoid valve 6 for controlling whether the inlet 3 is communicated with the first outlet 4, and the fluid pressure at the first outlet 4 is smaller than the fluid pressure at the inlet 3; the electromagnetic valve 6 does not have a reverse cut-off function, and the fluid backflow or the electromagnetic valve 6 damage can be caused when the pressure of the fluid at the first outlet 4 is greater than the pressure of the fluid at the inlet 3, so that the fluid pressure at the first outlet 4 is smaller than the fluid pressure at the inlet 3, the three-way electromagnetic valve can work normally, and the fluid pressure at the first outlet 4 is ensured by the service environment of the three-way electromagnetic valve; the on-off between the inlet 3 and the first outlet 4 is controlled by an electromagnetic valve 6;
as shown in fig. 1, 2 and 3, the valve seat 1 is further provided with a check valve 7 for controlling whether the inlet 3 is communicated with the second outlet 5, the check valve 7 is in forward conduction when the fluid pressure at the second outlet 5 is smaller than the fluid pressure at the inlet 3, and the check valve 7 is in reverse cut-off when the fluid pressure at the second outlet 5 is larger than the fluid pressure at the inlet 3. The check valve 7 has a reverse blocking function, and therefore, even if the fluid pressure at the second outlet 5 is greater than the fluid pressure at the inlet 3, the fluid at the second outlet 5 cannot enter the fluid passage 2 to be in series flow with other fluids.
The fluid pressure at the inlet 3 and the fluid pressure at the second outlet 5 are both ensured by the service environment of the three-way electromagnetic valve.
By adopting the technical scheme, the normal work of the three-way electromagnetic valve can be still ensured when the fluid pressure at the second outlet 5 is greater than the fluid pressure at the inlet 3.
The three-way electromagnetic valve in the technical scheme has the advantages of few interfaces and simple pipeline, has smaller volume and can adapt to different installation environments.
Example one
The embodiment further defines the check valve 7 in the above-mentioned solution.
As shown in fig. 1 and 3, the check valve 7 includes a piston member 8 and a valve cover 9, the piston member 8 is used for controlling the opening and closing of the inlet 3 and the second outlet 5, a fixing cavity 11 for fixing the valve cover 9 is provided on the valve seat 1, the valve cover 9 is connected in the fixing cavity 11 through a thread, the valve cover 9 can also be fixed in the fixing cavity 11 through other manners, a sealing ring should be provided between the valve cover 9 and a side wall of the fixing cavity 11, an elastic member such as a spring or the like should be provided between the piston member 8 and the valve cover 9 for pushing the piston member 8 to move, and the specific structure of the check valve 7 is a known structure in the prior art, and will not be described herein.
The installation mode of the check valve 7 on the valve seat 1 can refer to the prior art, and the conduction direction of the check valve 7 is as follows: when the fluid in the fluid passage 2 enters the second outlet 5 through the check valve 7, the check valve 7 is in forward conduction, and when the fluid at the second outlet 5 enters the fluid passage 2 through the check valve 7, that is, when the fluid pressure at the second outlet 5 is greater than the fluid pressure at the inlet 3, the check valve 7 is in reverse cut-off, so as to avoid the fluid series flow.
As shown in fig. 1 and 3, the check valve 7 performs an on-off function by utilizing the movement of the piston member 8 during a specific operation, for this purpose, a guide structure 10 for guiding the piston member 8 is joined to the valve cover 9, and the joining of the guide structure 10 to the valve cover 9 means that the guide structure 10 is fixedly connected to the valve cover 9, the guide structure 10 may be welded to the valve cover 9, and the guide structure 10 may also be an integral structure with the valve cover 9, for example, the guide structure 10 may be cast on the valve cover 9.
As shown in fig. 1 and 3, the guide structure 10 has a first guide surface, the piston member 8 has a second guide surface contacting the first guide surface, and the first guide surface contacts the second guide surface when the piston member 8 moves, so that the piston member 8 is guided, and the moving accuracy of the piston member 8 is improved.
As shown in fig. 1 and 3, the guide structure 10 is cylindrical, the first guide surface is an inner wall of the guide structure 10, the guide structure 10 is provided with a balance hole 12 for communicating an inner cavity of the guide structure 10 with the fixed cavity 11, the balance hole 12 is a through hole, the guide structure 10 has good guide performance, and the balance hole 12 is beneficial to improving the reliability of the piston component 8 and reducing the lowest operating pressure difference.
Or, the guiding structure 10 may also include at least two plate bodies, the piston part 8 is located between the two plate bodies, and the piston part 8 is guided by the two plate bodies, and in this scheme, the balancing hole 12 does not need to be formed in the guiding structure 10, thereby simplifying the structure of the check valve 7.
Example two
As shown in fig. 1, 2 and 3, the solenoid valve 6 is a normally open solenoid valve; alternatively, the electromagnetic valve 6 is a normally closed electromagnetic valve. The electromagnetic valve 6 is a normally open electromagnetic valve or a normally closed electromagnetic valve, which can realize the function of the electromagnetic valve 6, and is not specifically limited herein, and can be reasonably selected according to the related control device or the installation requirement.
As shown in fig. 1, 2 and 3, the solenoid valve 6 includes a valve cover member 13, the valve cover member 13 is fixed on the valve seat 1 by screws, the solenoid valve 6 further includes a coil member 14 and a solenoid valve piston member 15, the opening and closing of the inlet 3 and the first outlet 4 is controlled by the solenoid valve piston member 15, and the coil member 14 drives the solenoid valve piston member 15 to operate.
As shown in fig. 4, in order to facilitate the layout of the pipeline connected to the three-way solenoid valve, the inlet 3, the first outlet 4, and the second outlet 5 are correspondingly limited, and the scheme can be implemented in combination with the first embodiment and the second embodiment.
The axis of the second outlet 5 is perpendicular to the axis of the fluid channel 2, and the path of the fluid flowing through the one-way valve 7 is at right angle, which is beneficial to reducing the volume of the three-way electromagnetic valve.
The first outlet 4 and the second outlet 5 are both located on the same side of the valve seat 1.
The axis of the inlet 3 is coaxial with the axis of the fluid passage 2.
The three-way electromagnetic valve disclosed by the invention can be suitable for all fluid fields. Is especially suitable for the fields of automobile refrigeration systems or pneumatics and the like.
Some embodiments of the invention are described in detail above with reference to the accompanying drawings. After reading this description, those skilled in the art may modify the above embodiments based on the technical solution of the present invention, and these modifications still fall into the protection scope of the present invention.
Claims (10)
1. A three-way solenoid valve, includes disk seat (1), be equipped with fluid passage (2) in disk seat (1), its characterized in that: an inlet (3) communicated with the fluid channel (2) is arranged on the valve seat (1); the valve seat (1) is also provided with a first outlet (4) and a second outlet (5), and the first outlet (4) and the second outlet (5) are communicated with the inlet (3) through the fluid channel (2);
the valve seat (1) is provided with an electromagnetic valve (6) for controlling whether the inlet (3) is communicated with the first outlet (4), and the fluid pressure at the first outlet (4) is less than that at the inlet (3);
the valve seat (1) is also provided with a one-way valve (7) for controlling the connection between the inlet (3) and the second outlet (5), the fluid pressure at the second outlet (5) is smaller than the fluid pressure at the inlet (3), the one-way valve (7) is positively communicated, the fluid pressure at the second outlet (5) is larger than the fluid pressure at the inlet (3), the one-way valve (7) is reversely closed, and the opening and closing of the one-way valve are unrelated to the opening degree of the electromagnetic valve;
the check valve (7) comprises a piston member (8) and a valve cover (9), and a guide structure (10) for guiding the piston member (8) is jointed on the valve cover (9).
2. The three-way electromagnetic valve according to claim 1, characterized in that: the guide structure (10) is provided with a first guide surface, and the piston part (8) is provided with a second guide surface which is contacted with the first guide surface.
3. The three-way electromagnetic valve according to claim 2, characterized in that: the guide structure (10) is cylindrical, and the first guide surface is the inner wall of the guide structure (10).
4. A three-way solenoid valve according to claim 3, wherein: the valve seat (1) is provided with a fixed cavity (11) for fixing the valve cover (9), and the guide structure (10) is provided with a balance hole (12) for communicating the inner cavity of the guide structure (10) with the fixed cavity (11).
5. A three-way electromagnetic valve according to claim 2, 3 or 4, characterized in that: the valve cover (9) is connected in the fixed cavity (11) through threads.
6. The three-way electromagnetic valve according to claim 1, characterized in that: the electromagnetic valve (6) is a normally open electromagnetic valve; or the electromagnetic valve (6) is a normally closed electromagnetic valve.
7. The three-way electromagnetic valve according to claim 1, characterized in that: the axis of the second outlet (5) is perpendicular to the axis of the fluid channel (2).
8. A three-way electromagnetic valve according to claim 1, 6 or 7, characterized in that: the first outlet (4) and the second outlet (5) are both positioned on the same side of the valve seat (1).
9. The three-way electromagnetic valve according to claim 1 or 6, characterized in that: the electromagnetic valve (6) comprises a valve cover component (13), and the valve cover component (13) is fixed on the valve seat (1) through screws.
10. The three-way electromagnetic valve according to claim 8, wherein: the axis of the inlet (3) is coaxial with the axis of the fluid channel (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706129.8A CN109404567B (en) | 2017-08-17 | 2017-08-17 | Three-way electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710706129.8A CN109404567B (en) | 2017-08-17 | 2017-08-17 | Three-way electromagnetic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404567A CN109404567A (en) | 2019-03-01 |
| CN109404567B true CN109404567B (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710706129.8A Active CN109404567B (en) | 2017-08-17 | 2017-08-17 | Three-way electromagnetic valve |
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| Country | Link |
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| CN (1) | CN109404567B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113565993B (en) * | 2021-08-02 | 2023-04-07 | 江苏亿阀股份有限公司 | Electric control type multi-channel reversing ball valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994860A (en) * | 2009-08-14 | 2011-03-30 | 浙江三花股份有限公司 | Electromagnetic valve and heat exchange device comprising same |
| CN102606770A (en) * | 2011-01-24 | 2012-07-25 | 株式会社不二工机 | Three-way electromagnetic valve |
| CN103322274A (en) * | 2012-03-02 | 2013-09-25 | 米勒工业公司 | 3-way solenoid valve |
| CN205908804U (en) * | 2016-06-23 | 2017-01-25 | 盾安环境技术有限公司 | Three -way control valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6333086B2 (en) * | 2014-06-26 | 2018-05-30 | 株式会社不二工機 | 3-way solenoid valve |
-
2017
- 2017-08-17 CN CN201710706129.8A patent/CN109404567B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101994860A (en) * | 2009-08-14 | 2011-03-30 | 浙江三花股份有限公司 | Electromagnetic valve and heat exchange device comprising same |
| CN102606770A (en) * | 2011-01-24 | 2012-07-25 | 株式会社不二工机 | Three-way electromagnetic valve |
| CN103322274A (en) * | 2012-03-02 | 2013-09-25 | 米勒工业公司 | 3-way solenoid valve |
| CN205908804U (en) * | 2016-06-23 | 2017-01-25 | 盾安环境技术有限公司 | Three -way control valve |
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| CN109404567A (en) | 2019-03-01 |
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