CN113898632A - High-precision hydraulic electromagnetic valve - Google Patents
High-precision hydraulic electromagnetic valve Download PDFInfo
- Publication number
- CN113898632A CN113898632A CN202111255350.9A CN202111255350A CN113898632A CN 113898632 A CN113898632 A CN 113898632A CN 202111255350 A CN202111255350 A CN 202111255350A CN 113898632 A CN113898632 A CN 113898632A
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- Prior art keywords
- valve
- iron core
- core
- movable iron
- valve seat
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
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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
- F16K11/22—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 with an actuating member for each valve, e.g. interconnected to form multiple-way 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
- F16K31/0603—Multiple-way valves
- F16K31/061—Sliding valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention relates to the technical field of electromagnetic valves, in particular to a high-precision hydraulic electromagnetic valve, when a left coil is electrified, a left movable iron core moves leftwards, a left valve core moves leftwards and is separated from a through hole on the left side of a valve seat, a connecting rod moves leftwards at the moment, so that a right movable iron core moves leftwards and is matched with the through hole on the right side of the valve seat, so that the liquid in the liquid inlet can be discharged from the first liquid outlet only, when the right coil is electrified to cause the right movable iron core to move rightwards, the right valve core moves rightwards to be separated from the through hole on the right side of the valve seat, at the moment, the connecting rod moves rightwards, so that the left valve core moves rightwards to be matched with the through hole on the left side of the valve seat, so that the liquid in the liquid inlet can be discharged from the second liquid outlet only through the conjunction of the left valve core or the right valve core and the valve seat, thereby avoiding the liquid from overflowing from the closed valve port, and further improving the control and adjustment precision of the electromagnetic valve when in use.
Description
Technical Field
The invention relates to the technical field of electromagnetic valves, in particular to a high-precision hydraulic electromagnetic valve.
Background
At present, the hydraulic solenoid valve is mainly used for controlling the flow direction of hydraulic pressure, and most mechanical devices of factories are generally controlled by hydraulic cylinders, so that the hydraulic solenoid valve is required to be used.
However, most of valve cores used in the existing hydraulic electromagnetic valves are ball valves, and the ball valves cannot be well fitted with valve ports, so that the sealing effect of the ball valves on the valve ports is poor, liquid easily overflows from the valve ports, and the control and adjustment precision of the hydraulic electromagnetic valves in use is reduced.
Disclosure of Invention
The invention aims to provide a high-precision hydraulic electromagnetic valve which can improve the control and adjustment precision of the hydraulic electromagnetic valve in use.
In order to achieve the aim, the invention provides a high-precision hydraulic electromagnetic valve which comprises a valve body, a valve seat and a mounting assembly, wherein the valve body is provided with a valve seat; the valve seat is fixedly arranged on the inner side of the valve body; the executing component comprises a left movable iron core, a right movable iron core and a connecting rod, wherein the left movable iron core is fixedly connected with the left valve core and is positioned on one side, away from the valve seat, of the left valve core, the right movable iron core is fixedly connected with the right valve core and is positioned on one side, away from the valve seat, of the right valve core, two ends of the connecting rod are respectively fixedly connected with the left movable iron core and the right movable iron core, and the connecting rod is positioned between the left movable iron core and the right movable iron core.
Through the fit of the left valve core or the right valve core and the valve seat, liquid is prevented from overflowing from the closed valve port, and the control and adjustment precision of the electromagnetic valve in use is improved.
The control component comprises a left spring and a left fixed iron core, wherein the left spring is fixedly connected with the left movable iron core and is positioned on one side of the left movable iron core, which is far away from the left valve core; the left fixed iron core is fixedly connected with the left spring, fixedly connected with the valve body and positioned on the inner side of the valve body.
Wherein the control member further comprises a left coil fixedly mounted on an upper surface of the valve body.
The control component further comprises a left wiring terminal, and the left wiring terminal is fixedly installed on the upper surface of the left coil.
When the left wiring terminal is electrified, the two ends of the left coil are electrified, so that the left movable iron core moves towards the direction close to the left fixed iron core, and the left spring is compressed.
The control component further comprises a right spring and a right fixed iron core, wherein the right spring is fixedly connected with the right movable iron core and is positioned on one side of the right movable iron core, which is far away from the right valve core; the right fixed iron core is fixedly connected with the right spring, fixedly connected with the valve body and positioned on the inner side of the valve body.
Wherein the control member further comprises a right coil fixedly mounted on an upper surface of the valve body.
Wherein, the control component still includes right binding post, right binding post fixed mounting in the upper surface of right coil.
When the right wiring terminal is electrified, two ends of the right coil are electrified, so that the right movable iron core moves towards the direction close to the right fixed iron core, and the right spring is compressed.
According to the high-precision hydraulic electromagnetic valve, when a left coil is electrified, a left movable iron core moves leftwards, a left valve core moves leftwards and is separated from a through hole on the left side of a valve seat, a connecting rod moves leftwards, so that a right movable iron core moves leftwards and is matched with the through hole on the right side of the valve seat, liquid in a liquid inlet can only be discharged from a first liquid outlet, when a right coil is electrified, the right movable iron core moves rightwards and is separated from the through hole on the right side of the valve seat, the connecting rod moves rightwards, so that the left valve core moves rightwards and is matched with the through hole on the left side of the valve seat, liquid in the liquid inlet can only be discharged from a second liquid outlet, and liquid is prevented from overflowing from a closed valve port by matching of the left valve core or the right valve core with the valve seat, and further improves the control and adjustment precision of the electromagnetic valve in use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of the left coil mounted on the valve body according to the present invention.
Fig. 2 is a schematic structural view of the right coil provided by the invention mounted on the valve body.
Fig. 3 is a schematic view of the connection between the left spring and the left stationary core provided by the present invention.
Fig. 4 is a schematic diagram of the connection between the left movable iron core and the left valve core provided by the invention.
Fig. 5 is a schematic view of the connection between the right spring and the right stationary core provided by the present invention.
In the figure: 1-valve body, 2-valve seat, 3-mounting component, 11-liquid inlet, 12-first liquid outlet, 13-second liquid outlet, 31-left valve core, 32-right valve core, 33-control component, 34-execution component, 100-high precision hydraulic electromagnetic valve, 331-left spring, 332-left fixed iron core, 333-left coil, 334-left wiring terminal, 335-right spring, 336-right fixed iron core, 337-right coil, 338-right wiring terminal, 341-left movable iron core, 342-right movable iron core, 343-connecting rod, 344-left sealing ring and 345-right sealing ring.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention. Further, in the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
Referring to fig. 1 to 5, the present invention provides a high precision hydraulic solenoid valve 100, which includes a valve body 1, a valve seat 2 and a mounting assembly 3; the valve seat 2 is fixedly arranged on the inner side of the valve body 1; the mounting assembly 3 comprises a left valve core 31, a right valve core 32, a control member 33 and an actuating member 34, wherein the left valve core 31 is connected with the valve seat 2 in a sliding manner and is positioned on the inner side of the valve seat 2, the right valve core 32 is connected with the valve seat 2 in a sliding manner and is positioned on one side of the valve seat 2 far away from the left valve core 31, and the control member 33 is positioned on one side of the valve body 1 far away from the valve seat 2; the actuating member 34 includes a left movable iron core 341, a right movable iron core 342, and a connecting rod 343, the left movable iron core 341 is fixedly connected to the left valve core 31 and is located on one side of the left valve core 31 away from the valve seat 2, the right movable iron core 342 is fixedly connected to the right valve core 32 and is located on one side of the right valve core 32 away from the valve seat 2, two ends of the connecting rod 343 are respectively fixedly connected to the left movable iron core 341 and the right movable iron core 342, and the connecting rod 343 is located between the left movable iron core 341 and the right movable iron core 342.
In this embodiment, the valve body 1 is T-shaped, the interior of the valve body 1 is a hollow structure, the valve body 1 has a liquid inlet 11, a first liquid outlet 12 and a second liquid outlet 13, the liquid inlet 11 is located on one side of the valve body 1 close to the valve seat 2, the first liquid outlet 12 and the second liquid outlet 13 are respectively located on the left side and the right side of the valve body 1 away from the valve seat 2, the interior of the valve seat 2 is a hollow structure, two sides of the valve seat 2 close to the left valve core 31 and the right valve core 32 are respectively provided with a through hole having a frustum shape with the same size, the tip end of the left valve core 31 and the tip end of the right valve core 32 are conical, and the through hole of the valve seat 2 is matched with the left valve core 31 and the right valve core 32, so that the left valve core 31 and the right valve core 32 can be completely matched with the through hole of the valve seat 2, the left valve core 31 and the right valve core 32 are connected with the valve seat 2 in a transverse sliding manner, the left movable iron core 341 is fixedly connected with the left valve core 31, the right movable iron core 342 is fixedly connected with the right valve core 32, so that the left and right movements of the left movable iron core 341 and the right movable iron core 342 can drive the left valve core 31 and the right valve core 32 to transversely slide in the valve seat 2, the connecting rod 343 is fixedly installed between the left movable iron core 341 and the right movable iron core 342, thus, when the left coil is energized to make the left movable iron core 341 move leftwards, the left valve core 31 moves leftwards and is separated from the through hole on the left side of the valve seat 2, at this time, the connecting rod 343 moves leftwards, so that the right movable iron core 342 moves leftwards and is engaged with the through hole on the right side of the valve seat 2, and further, the liquid in the liquid inlet 11 can only be discharged from the first liquid outlet 12, when the right coil is energized, the right movable iron core 342 moves rightwards, the right valve core 32 moves rightwards and is separated from the through hole on the right side of the valve seat 2, and at the moment, the connecting rod 343 moves rightwards, so that the left valve core 31 moves rightwards and is matched with the through hole on the left side of the valve seat 2, and further, the liquid in the liquid inlet 11 can only be discharged from the second liquid outlet 13, and through the matching of the left valve core 31 or the right valve core 32 and the valve seat 2, the liquid is prevented from overflowing from a closed valve port, and the control and adjustment precision of the electromagnetic valve in use is improved.
Further, referring to fig. 3 to fig. 5, the control member 33 includes a left spring 331 and a left fixed iron core 332, the left spring 331 is fixedly connected to the left movable iron core 341 and is located on a side of the left movable iron core 341 away from the left valve core 31; the left iron core 332 is fixedly connected to the left spring 331, fixedly connected to the valve body 1, and located inside the valve body 1.
Further, referring to fig. 1, 2 and 4, the control member 33 further includes a left coil 333, and the left coil 333 is fixedly mounted on the upper surface of the valve body 1.
Further, referring to fig. 1, 2 and 4, the control member 33 further includes a left connection terminal 334, and the left connection terminal 334 is fixedly mounted on an upper surface of the left coil 333.
Further, referring to fig. 3 to fig. 5, the control member 33 further includes a right spring 335 and a right stationary core 336, wherein the right spring 335 is fixedly connected to the right movable core 342 and is located on a side of the right movable core 342 away from the right valve core 32; the right stator core 336 is fixedly connected with the right spring 335, fixedly connected with the valve body 1 and positioned on the inner side of the valve body 1.
Further, referring to fig. 1, 2 and 4, the control member 33 further includes a right coil 337, and the right coil 337 is fixedly mounted on the upper surface of the valve body 1.
Further, referring to fig. 1, 2 and 4, the control member 33 further includes a right connection terminal 338, and the right connection terminal 338 is fixedly mounted on an upper surface of the right coil 337.
In this embodiment, the left spring 331 is fixedly installed between the left movable core 341 and the left fixed core 332, the left fixed core 332 is fixedly connected to the valve body 1, the left coil 333 is fixedly installed above the valve body 1, the left connection terminal 334 is fixedly installed above the left coil 333, when the left connection terminal 334 is energized, both ends of the left coil 333 are energized, so that a certain current flows through the left coil 333 to generate an electromagnetic induction force, the left movable core 341 is attracted to move in a direction close to the left fixed core 332 by the electromagnetic induction force of the left coil 333, so that the left spring 331 is compressed, at this time, the left valve element 31 moves leftward along with the left movable core 341, so that the left valve element 31 is separated from the through hole on the left side of the valve seat 2, and the liquid in the liquid inlet 11 is discharged from the first liquid outlet 12, when the left connection terminal 334 stops being energized, the electromagnetically induced force of the left coil 333 disappears, at this time, due to the self-restoring action of the left spring 331, the left movable iron core 341 and the left valve element 31 are restored to the original positions, the right spring 335 is fixedly installed between the right movable iron core 342 and the right fixed iron core 336, the right fixed iron core 336 is fixedly connected with the valve body 1, the right coil 337 is fixedly installed above the valve body 1, the right connection terminal 338 is fixedly installed above the right coil 337, when the right connection terminal 338 is energized, both ends of the right coil 337 are energized, so that a certain current flows through the right coil 337 to generate the electromagnetically induced force, and the electromagnetically induced force of the right coil 337 attracts the right movable iron core 342 to move in a direction approaching the right fixed iron core 336, and further compressing the right spring 335, and at this time, the right valve element 32 moves rightward along with the right movable iron core 342, so that the right valve element 32 is separated from the through hole on the right side of the valve seat 2, and further the liquid in the liquid inlet 11 is discharged from the second liquid outlet 13, when the right connection terminal 338 stops being powered on, the electromagnetic induction force of the right coil 337 disappears, and at this time, due to the self-recovery action of the right spring 335, the right movable iron core 342 and the right valve element 32 recover to the original positions.
Further, referring to fig. 3 and 4, the actuating member 34 further includes a left sealing ring 344, and the left sealing ring 344 is fixedly connected to the left valve core 31 and sleeved on the outer side of the left valve core 31.
Further, referring to fig. 3 and 4, the actuating member 34 further includes a right sealing ring 345, and the right sealing ring 345 is fixedly connected to the right valve core 32 and sleeved on the outer side of the right valve core 32.
In this embodiment, the left sealing ring 344 is fixedly installed on the outer side of the left valve element 31, the right sealing ring 345 is fixedly installed on the outer side of the right valve element 32, and the left sealing ring 344 and the right sealing ring 345 are arranged, so that the left sealing ring 344 or the right sealing ring 345 can seal the through hole on the left side of the left valve element 31 and the valve seat 2 or the through hole on the right side of the right valve element 32 and the valve seat 2, and further liquid is prevented from overflowing from the through hole opened by the valve seat 2.
According to the high-precision hydraulic electromagnetic valve 100, when the left coil is energized to move the left movable iron core 341 to the left, the left valve core 31 moves to the left to be separated from the through hole on the left side of the valve seat 2, the connecting rod 343 moves to the left, so that the right movable iron core 342 moves to the left to be engaged with the through hole on the right side of the valve seat 2, and further, the liquid in the liquid inlet 11 can only be discharged from the first liquid outlet 12, when the right coil is energized to move the right, the right valve core 32 moves to the right to be separated from the through hole on the right side of the valve seat 2, the connecting rod 343 moves to the right, so that the left valve core 31 moves to the right to be engaged with the through hole on the left side of the valve seat 2, and further, the liquid in the liquid inlet 11 can only be discharged from the second liquid outlet 13, and is engaged with the valve seat 2 through the left valve core 31 or the right valve core 32, thereby avoiding the liquid from overflowing from the closed valve port, and further improving the control and adjustment precision of the electromagnetic valve when in use.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A high-precision hydraulic electromagnetic valve is characterized by comprising a valve body, a valve seat and a mounting assembly;
the valve seat is fixedly arranged on the inner side of the valve body;
the mounting assembly comprises a left valve core, a right valve core, a control member and an execution member, the left valve core is connected with the valve seat in a sliding mode and is positioned on the inner side of the valve seat, the right valve core is connected with the valve seat in a sliding mode and is positioned on one side, far away from the left valve core, of the valve seat, and the control member is positioned on one side, far away from the valve seat, of the valve body;
the executing component comprises a left movable iron core, a right movable iron core and a connecting rod, wherein the left movable iron core is fixedly connected with the left valve core and is positioned on one side, away from the valve seat, of the left valve core, the right movable iron core is fixedly connected with the right valve core and is positioned on one side, away from the valve seat, of the right valve core, two ends of the connecting rod are respectively fixedly connected with the left movable iron core and the right movable iron core, and the connecting rod is positioned between the left movable iron core and the right movable iron core.
2. The high precision hydraulic solenoid valve of claim 1,
the control component comprises a left spring and a left fixed iron core, and the left spring is fixedly connected with the left movable iron core and is positioned on one side of the left movable iron core, which is far away from the left valve core; the left fixed iron core is fixedly connected with the left spring, fixedly connected with the valve body and positioned on the inner side of the valve body.
3. The high precision hydraulic solenoid valve of claim 2,
the control member further includes a left coil fixedly mounted on an upper surface of the valve body.
4. The high precision hydraulic solenoid valve of claim 3,
the control component further comprises a left wiring terminal which is fixedly installed on the upper surface of the left coil.
5. The high precision hydraulic solenoid valve of claim 1,
the control component also comprises a right spring and a right fixed iron core, wherein the right spring is fixedly connected with the right movable iron core and is positioned on one side of the right movable iron core, which is far away from the right valve core; the right fixed iron core is fixedly connected with the right spring, fixedly connected with the valve body and positioned on the inner side of the valve body.
6. The high precision hydraulic solenoid valve of claim 5,
the control member further includes a right coil fixedly mounted on an upper surface of the valve body.
7. The high precision hydraulic solenoid valve of claim 6,
the control component further comprises a right wiring terminal which is fixedly installed on the upper surface of the right coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255350.9A CN113898632A (en) | 2021-10-27 | 2021-10-27 | High-precision hydraulic electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111255350.9A CN113898632A (en) | 2021-10-27 | 2021-10-27 | High-precision hydraulic electromagnetic valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113898632A true CN113898632A (en) | 2022-01-07 |
Family
ID=79027100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111255350.9A Pending CN113898632A (en) | 2021-10-27 | 2021-10-27 | High-precision hydraulic electromagnetic valve |
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| CN (1) | CN113898632A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002188732A (en) * | 2000-12-20 | 2002-07-05 | Ckd Corp | Fluid control valve |
| CN102338231A (en) * | 2011-08-26 | 2012-02-01 | 北京航天动力研究所 | Two-position three-way electromagnetic valve |
| CN207093854U (en) * | 2017-07-05 | 2018-03-13 | 上海工程技术大学 | A kind of water mixing valve based on thermal imaging and the tap containing the water mixing valve |
| CN207364329U (en) * | 2017-10-19 | 2018-05-15 | 嘉兴科奥电磁技术有限公司 | Two-position three-way valve |
| CN207921389U (en) * | 2018-01-25 | 2018-09-28 | 杭州圣渥科技有限公司 | reversing valve of water purifier and water purifier |
| CN111059326A (en) * | 2019-11-08 | 2020-04-24 | 北京精密机电控制设备研究所 | Two-position three-way high-temperature reversing valve directly driven by double-voice coil motor |
| CN214008169U (en) * | 2020-11-27 | 2021-08-20 | 江麓机电集团有限公司 | Electromagnetic directional valve |
-
2021
- 2021-10-27 CN CN202111255350.9A patent/CN113898632A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002188732A (en) * | 2000-12-20 | 2002-07-05 | Ckd Corp | Fluid control valve |
| CN102338231A (en) * | 2011-08-26 | 2012-02-01 | 北京航天动力研究所 | Two-position three-way electromagnetic valve |
| CN207093854U (en) * | 2017-07-05 | 2018-03-13 | 上海工程技术大学 | A kind of water mixing valve based on thermal imaging and the tap containing the water mixing valve |
| CN207364329U (en) * | 2017-10-19 | 2018-05-15 | 嘉兴科奥电磁技术有限公司 | Two-position three-way valve |
| CN207921389U (en) * | 2018-01-25 | 2018-09-28 | 杭州圣渥科技有限公司 | reversing valve of water purifier and water purifier |
| CN111059326A (en) * | 2019-11-08 | 2020-04-24 | 北京精密机电控制设备研究所 | Two-position three-way high-temperature reversing valve directly driven by double-voice coil motor |
| CN214008169U (en) * | 2020-11-27 | 2021-08-20 | 江麓机电集团有限公司 | Electromagnetic directional valve |
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