CN117605840A - Low-power consumption proportional flow valve device suitable for high, medium and low pressures - Google Patents
Low-power consumption proportional flow valve device suitable for high, medium and low pressures Download PDFInfo
- Publication number
- CN117605840A CN117605840A CN202311796099.6A CN202311796099A CN117605840A CN 117605840 A CN117605840 A CN 117605840A CN 202311796099 A CN202311796099 A CN 202311796099A CN 117605840 A CN117605840 A CN 117605840A
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- Prior art keywords
- valve
- valve body
- sealing ring
- core
- coil
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 50
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 38
- 230000003068 static effect Effects 0.000 claims abstract description 34
- 230000005389 magnetism Effects 0.000 claims abstract description 8
- -1 polytetrafluoroethylene Polymers 0.000 claims description 9
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 9
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 6
- 238000002955 isolation Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000004519 grease Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 238000009434 installation Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 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
-
- 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
- F16K1/36—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
- 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
- F16K1/46—Attachment of sealing rings
-
- 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
- F16K31/0644—One-way valve
- F16K31/0655—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
- F16K31/02—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
-
- 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
- F16K39/00—Devices for relieving the pressure on the sealing faces
- F16K39/02—Devices for relieving the pressure on the sealing faces for lift valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention provides a low-power consumption proportional flow valve device adapting to high, medium and low pressure, which comprises an adjusting screw rod, an adjusting screw rod sealing ring, a coil shell, an adjusting spring, a magnetism isolating pad, an armature, a coil, a static iron core, a leaf spring, a valve body sealing ring, a valve core sealing ring and a valve body; the valve core assembly is arranged on the valve body assembly, the valve body sealing ring is arranged on the upper surface of the leaf spring of the valve core assembly, and the static iron core assembly and the coil assembly are sequentially arranged after the valve core assembly and the coil assembly are arranged.
Description
Technical Field
The invention relates to a low-power consumption proportional flow valve device suitable for high, medium and low pressures, and belongs to the fields of mechanical engineering and electronic engineering.
Background
The oxyhydrogen fuel cell energy system is an important application trend in the future aerospace and military fields. The proportional flow valve is a key control element related to the operation power of the fuel cell, and is an important development direction of the proportional flow valve for the fuel cell, aiming at the requirements of light weight and low power consumption of aerospace application, in order to further improve the specific power and specific energy of the fuel cell and reduce the energy loss of the system, and the proportional flow valve device is suitable for high, medium and low voltage and low power consumption.
The power consumption of the existing valve in the flow regulation process of the proportional valve is overlarge, and the influence of the pressure fluctuation of the system inlet on the opening of the valve port is large.
Disclosure of Invention
The invention solves the technical problems that: the invention provides a low-power consumption proportional flow valve device suitable for high, medium and low pressures, which solves the problem of overlarge power consumption in the flow regulation process of a proportional valve, solves the influence of system inlet pressure fluctuation on the opening of a valve port, and solves the problem of adaptability of the proportional valve to high, medium and low pressures.
The technical scheme of the invention is as follows: a low-power consumption proportional flow valve device suitable for high, medium and low pressures comprises an adjusting screw, an adjusting screw sealing ring, a coil shell, an adjusting spring, a magnetism isolating pad, an armature, a coil, a static iron core, a leaf spring, a valve body sealing ring, a valve core sealing ring and a valve body;
the coil is installed in the coil housing; one end of the valve core passes through a central hole of the leaf spring and is arranged at one end of the central hole of the armature, and the armature is inserted into a central cylinder of the static iron core from the bottom; the magnetic isolation pad is sleeved on a guide rod arranged at the other end of the armature center hole;
the adjusting screw is arranged at the top of the static iron core, and an adjusting screw sealing ring is arranged between the adjusting screw and the static iron core; the adjusting spring is sleeved on the guide rod and is positioned between the end part of the adjusting screw and the magnetism isolating pad, and the end part of the guide rod can move in the central hole of the end part of the adjusting screw;
the coil and the coil shell are arranged on the static iron core, and the central cylinder of the mirror iron core is inserted into the central hole of the coil; the static iron core is arranged on the valve body, the valve core is inserted into the valve body, the leaf spring is positioned on the step surface of the step hole at the upper part of the valve body, the valve body sealing ring is arranged between the leaf spring and the end surface of the static iron core, and the valve seat is positioned in the step hole at the upper part of the valve body; the step hole at the upper part of the valve body is communicated with the valve body inlet channel through the valve seat center hole and is communicated with the valve body outlet channel; the valve core is inserted into the valve seat center hole, passes through the valve body inlet channel and is inserted into the valve core mounting hole on the inner wall of the valve body, and the inner wall of the valve core mounting hole is provided with a valve core sealing ring for sealing the valve core.
Furthermore, 7805 lubricating grease is smeared in the mounting ring groove of the adjusting screw sealing ring.
Further, the valve further comprises a lower pressing plate and a pressing plate sealing ring, a balance cavity is arranged on the outer side of a valve core mounting hole on the inner wall of the valve body, the pressing plate sealing ring is arranged in a ring groove at a port of the balance cavity, the balance cavity is covered by the pressing plate, and the balance cavity is communicated with an outlet channel of the valve body through a pressure balance hole.
Furthermore, the valve core sealing ring adopts a polytetrafluoroethylene wrapping sealing ring, and the rubber sealing ring wraps the polytetrafluoroethylene wrapping layer.
Further, the leaf spring takes the form of a three-arm.
Further, when the valve works, an external power supply supplies power to the coil, a magnetic field is generated after the coil is electrified, and magnetic force is formed through the magnetic field formed by the static iron core and the armature; the electromagnetic force balances the upward attraction force generated by the armature and the spring force of the regulating spring, and simultaneously the opening between the valve core and the valve seat of the valve body is changed; when the valve core and the valve seat are separated and opened, liquid enters the central hole of the valve seat from the valve body inlet channel and then enters the valve body outlet channel, so that liquid circulation is realized.
Further, the diaphragm magnetic ring formed by the static iron core and the armature is a variable-stroke diaphragm magnetic ring, the change of the electromagnetic force is realized by adjusting the power supply of the coil, and the stroke change of the diaphragm magnetic ring is matched with the movement process of the valve core.
Compared with the prior art, the invention has the beneficial effects that:
1. compared with the existing large-flow proportional flow valve, the working pressure is increased from 0.8MPa to 3.2MPa, and the influence of the inlet pressure on the opening degree of the proportional valve is reduced.
2. The valve can realize the proportional adjustment of the valve opening degree with smaller structure and smaller power consumption.
3. The invention adopts the leaf spring to control the centering of the valve core, improves the centering of the valve core installation and reduces the friction and wear performance of the armature.
4. According to the invention, the polytetrafluoroethylene is adopted to wrap the sealing ring, so that the friction force of the sealing pair can be reduced on the premise of ensuring the tightness.
Drawings
FIG. 1 is a block diagram of a low power proportional flow valve device accommodating high, medium and low pressures;
FIG. 2 is a block diagram of a leaf spring;
FIG. 3 is an enlarged view of a portion of a valve of the present invention;
FIG. 4 is a block diagram of a valve core seal ring;
FIG. 5 is a diagram illustrating the operation of the valve of the present invention;
fig. 6 is a top view of the valve device of the present invention.
Detailed Description
The invention is described with reference to the accompanying drawings.
As shown in fig. 1 and 6, the low-power consumption proportional flow valve device suitable for high, medium and low pressures comprises an adjusting screw 1, an adjusting screw sealing ring 2, a coil housing 3, an adjusting spring 4, a magnetism isolating pad 5, an armature 6, a coil 7, a static iron core 8, a leaf spring 9, a valve body sealing ring 10, a valve core 11, a valve core sealing ring 12, a valve body 13, a lower pressing plate 14 and a pressing plate sealing ring 15.
The sealing ring 12 is arranged in a radial annular groove of the valve body 13, the sealing ring 15 is arranged in an axial annular groove of the valve body 13, and the sealing ring is pressed and fixed by a lower pressing plate and a screw to form a valve body assembly.
The coil housing 3 and the coil 7 are mounted as relatively independent coil assemblies.
The armature 6, the valve core 11, the leaf spring 9, the magnetism isolating pad 5 and the adjusting spring 4 are installed together, and the armature 6 and the valve core 11 are fastened and fixed in a threaded connection mode. After the fixing, the component formed by the armature 6, the valve core 11 and the leaf spring 9 is inserted into the static iron core 8 from the bottom. Firstly, a magnetic isolation pad 5 is sleeved on a guide rod at the upper part of an armature 6, and an adjusting spring 4 is sleeved on the guide rod at the upper part of the armature 6 and contacts with the upper end surface of the magnetic isolation pad 5 to form a valve core assembly;
the adjusting screw sealing ring 2 is arranged in a radial ring groove of the static iron core 8, trace 7805 lubricating grease is smeared at the radial ring groove, and the adjusting screw 1 is screwed into the thread at the top of the static iron core 8 to form a static iron core assembly.
The valve core assembly is arranged on the valve body assembly, the valve body sealing ring 10 is arranged on the upper surface of the leaf spring 9 of the valve core assembly, and after the valve core assembly and the coil assembly are arranged, the static iron core assembly and the coil assembly are sequentially arranged and are fixedly connected by screws.
The coil 7 is installed in the coil housing 3; one end of a valve core 11 passes through a central hole of the leaf spring 9 and is arranged at one end of a central hole of the armature 6, and the armature 6 is inserted into a central cylinder of the static iron core 8 from the bottom; the magnetic isolation pad 5 is sleeved on a guide rod arranged at the other end of the central hole of the armature 6;
the adjusting screw 1 is arranged at the top of the static iron core 8, and the adjusting screw sealing ring 2 is arranged between the adjusting screw 1 and the static iron core 8; the adjusting spring 4 is sleeved on the guide rod and is positioned between the end part of the adjusting screw 1 and the magnetism isolating pad 5, and the end part of the guide rod can move in the central hole of the end part of the adjusting screw 1;
the coil 7 and the coil housing 8 are arranged on the static iron core 8, and a central cylinder of the mirror iron core 8 is inserted into a central hole of the coil 7; the static iron core 8 is arranged on the valve body 13, the valve core 11 is inserted into the valve body 13, the leaf spring 9 is positioned on the step surface of the step hole at the upper part of the valve body 13, the valve body sealing ring 10 is arranged between the leaf spring 9 and the end surface of the static iron core 8, and the valve seat is positioned in the step hole at the upper part of the valve body 13; the step hole at the upper part of the valve body 13 is communicated with the valve body inlet channel through the valve seat center hole and is communicated with the valve body outlet channel; the valve core 11 is inserted into the valve seat center hole, passes through the valve body inlet passage and is inserted into the valve core mounting hole on the inner wall of the valve body 13, and the valve core sealing ring 12 is mounted on the inner wall of the valve core mounting hole to seal the valve core 11. The balance cavity is arranged outside the valve core mounting hole on the inner wall of the valve body 1, a pressing plate sealing ring 15 is arranged in a ring groove at the port of the balance cavity, the balance cavity is covered by a pressing plate 14, and the balance cavity is communicated with the valve body outlet channel through a pressure balance hole.
When the valve works, an external power supply supplies power to the coil 7, a magnetic field is generated after the coil 7 is electrified, and a magnetic force is formed through a special magnetic field formed by the static iron core 8 and the armature 6. The electromagnetic force is changed by adjusting the power supply of the coil 7. The armature 6 is fixedly connected with the valve core 11, and the electromagnetic force balances the upward attraction force generated by the armature 6 and the spring force of the regulating spring 4, and meanwhile, the opening degree between the valve core 11 and the valve body 13 is changed, as shown in fig. 1.
Unlike the fixed size diaphragm magnet ring used by the traditional proportion electromagnet, the diaphragm magnet ring formed by the static iron core 8 and the armature 6 of the valve is a variable-stroke diaphragm magnet ring, the stroke change of the diaphragm magnet ring is matched with the movement process of the valve core 11, and the force and displacement of the movable iron core of the proportion electromagnet in the movement process are ensured to be approximately linear, as shown in figure 3.
The valve adopts a direct-drive type proportional valve structure, the valve core 11 part adopts a balanced valve core structure, unbalanced force caused by air supply pressure difference at the inlet and outlet of the valve core 11 is reduced through the valve core sealing ring 12 and the pressure balance hole, influence of air supply pressure on the opening degree of the valve is reduced, and meanwhile, the power consumption of the proportional valve is reduced, as shown in fig. 5.
The friction-free design based on the thin-wall plate spring 9 for keeping the armature movement is adopted, so that the wear resistance of the armature material is effectively improved. The leaf spring 9 is in a 3-arm form, has strong centering adjustment capability, can effectively ensure the installation centering of the armature 6 and the valve core 11, and improves the service life of the proportional valve, as shown in fig. 2.
The valve core sealing ring 12 is a polytetrafluoroethylene wrapping sealing ring, the rubber sealing ring 16 wraps the polytetrafluoroethylene wrapping layer 17, on one hand, the polytetrafluoroethylene wrapping layer 17 and the metal wall surface are sealed by means of elastic extrusion of the sealing ring, on the other hand, the friction force at the sealing pair is reduced by means of the super-sliding property of polytetrafluoroethylene, and the flexibility of valve core movement of the proportional flow valve is improved, as shown in fig. 4.
The invention, in part not described in detail, is within the skill of those skilled in the art.
Claims (7)
1. The low-power consumption proportional flow valve device suitable for high, medium and low pressures is characterized by comprising an adjusting screw (1), an adjusting screw sealing ring (2), a coil housing (3), an adjusting spring (4), a magnetism isolating pad (5), an armature (6), a coil (7), a static iron core (8), a leaf spring (9), a valve body sealing ring (10), a valve core (11), a valve core sealing ring (12) and a valve body (13);
the coil (7) is arranged in the coil housing (3); one end of the valve core (11) passes through a central hole of the leaf spring (9) and is arranged at one end of a central hole of the armature (6), and the armature (6) is inserted into a central cylinder of the static iron core (8) from the bottom; the magnetic isolation pad (5) is sleeved on a guide rod arranged at the other end of the central hole of the armature (6);
the adjusting screw (1) is arranged at the top of the static iron core (8), and an adjusting screw sealing ring (2) is arranged between the adjusting screw (1) and the static iron core (8); the adjusting spring (4) is sleeved on the guide rod and is positioned between the end part of the adjusting screw (1) and the magnetism isolating pad (5), and the end part of the guide rod can move in the central hole of the end part of the adjusting screw (1);
the coil (7) and the coil housing (8) are arranged on the static iron core (8), and a central cylinder of the mirror iron core (8) is inserted into a central hole of the coil (7); the static iron core (8) is arranged on the valve body (13), the valve core (11) is inserted into the valve body (13), the leaf spring (9) is positioned on the step surface of the step hole at the upper part of the valve body (13), the valve body sealing ring (10) is arranged between the leaf spring (9) and the end surface of the static iron core (8), and the valve seat is positioned in the step hole at the upper part of the valve body (13); the step hole at the upper part of the valve body (13) is communicated with the valve body inlet channel through the valve seat center hole and is communicated with the valve body outlet channel; the valve core (11) is inserted into the valve seat center hole, passes through the valve body inlet channel and is inserted into a valve core mounting hole on the inner wall of the valve body (13), and a valve core sealing ring (12) is mounted on the inner wall of the valve core mounting hole to seal the valve core (11).
2. The low-power consumption proportional flow valve device adapting to high, medium and low pressures according to claim 1, wherein 7805 lubricating grease is smeared in a mounting ring groove of the adjusting screw sealing ring (2).
3. The low-power consumption proportional flow valve device adapting to high, medium and low pressures according to claim 1 is characterized by further comprising a lower pressing plate (14) and a pressing plate sealing ring (15), wherein a balance cavity is arranged outside a valve core mounting hole on the inner wall of the valve body (1), the pressing plate sealing ring (15) is arranged in a ring groove at a port of the balance cavity, the balance cavity is covered by the pressing plate (14), and the balance cavity is communicated with an outlet channel of the valve body through a pressure balance hole.
4. The low-power consumption proportional flow valve device adapting to high, medium and low pressures according to claim 1, wherein the valve core sealing ring 12 is a polytetrafluoroethylene wrapping sealing ring, and the rubber sealing ring (16) wraps a polytetrafluoroethylene wrapping layer (17).
5. A low power proportional flow valve device adapting to high, medium and low pressures as claimed in claim 1, wherein said leaf spring (9) takes the form of a three-arm.
6. The low-power consumption proportional flow valve device adapting to high, medium and low pressures according to any one of claims 1 to 5, wherein when the valve works, an external power supply supplies power to the coil (7), the coil (7) generates a magnetic field after being electrified, and the magnetic field formed by the static iron core (8) and the armature (6) forms magnetic force; the electromagnetic force balances the upward suction force generated by the armature (6) and the spring force of the regulating spring (4) and simultaneously changes the opening between the valve core (11) and the valve seat of the valve body (13); when the valve core (11) and the valve seat are separated and opened, liquid enters the central hole of the valve seat from the inlet channel of the valve body and then enters the outlet channel of the valve body, so that liquid circulation is realized.
7. The low-power consumption proportional flow valve device adapting to high, medium and low pressures according to claim 6 is characterized in that a diaphragm magnetic ring formed by the static iron core (8) and the armature (6) is a variable-stroke diaphragm magnetic ring, the change of electromagnetic force is realized by adjusting the power supply of the coil (7), and the stroke change of the diaphragm magnetic ring is matched with the movement process of the valve core (11).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311796099.6A CN117605840A (en) | 2023-12-25 | 2023-12-25 | Low-power consumption proportional flow valve device suitable for high, medium and low pressures |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311796099.6A CN117605840A (en) | 2023-12-25 | 2023-12-25 | Low-power consumption proportional flow valve device suitable for high, medium and low pressures |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117605840A true CN117605840A (en) | 2024-02-27 |
Family
ID=89958032
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311796099.6A Pending CN117605840A (en) | 2023-12-25 | 2023-12-25 | Low-power consumption proportional flow valve device suitable for high, medium and low pressures |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117605840A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118088714A (en) * | 2024-04-28 | 2024-05-28 | 余姚市三力信电磁阀有限公司 | Miniature proportional solenoid valve |
-
2023
- 2023-12-25 CN CN202311796099.6A patent/CN117605840A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118088714A (en) * | 2024-04-28 | 2024-05-28 | 余姚市三力信电磁阀有限公司 | Miniature proportional solenoid valve |
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