CN105179785B - A kind of new magnetorheological digital valve and its control method - Google Patents
A kind of new magnetorheological digital valve and its control method Download PDFInfo
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- CN105179785B CN105179785B CN201510572052.0A CN201510572052A CN105179785B CN 105179785 B CN105179785 B CN 105179785B CN 201510572052 A CN201510572052 A CN 201510572052A CN 105179785 B CN105179785 B CN 105179785B
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- iron core
- magnetic
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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
- 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
- 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
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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
- F16K31/0679—Electromagnet aspects, e.g. electric supply therefor with more than one energising coil
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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 present invention discloses a kind of new magnetorheological digital valve and its control method.A kind of new MR valve structure is proposed from another angle, makes MR valve that there is very big control range, can not only realize big flow control, can also carry out less differential pressure flow control；Simultaneously for the switch of valve port, due to the limitation of this body structure of valve, cooperated using three power supplys so that lag time can be reduced on the original basis.Present invention use and in the past different MR valve structures, are significantly greatly increased the control range of MR valve.There is superior seal simultaneously, and multiple control modes can be used, it is adaptable to a variety of occasions.And a high speed valve can be turned into when without using magnetic flow liquid, and with the response time being exceedingly fast.
Description
Technical field
The invention belongs to hydraulic control valve and its control method technical field, more particularly to be that a kind of magnetic flow liquid is voltage-controlled
Valve processed, the magnetorheological digital valve of design is improved to MR valve structure, and reach preferable performance by improving its control.
Background technology
MR valve is not moved by controlling field coil current size come the flow of control valve yet with MR valve
Dynamic mechanical part, therefore control range is small, it is also restricted in applicability.
Because the hydraulic control scope of MR valve is mainly influenceed by two aspects：
(1) angle of magnetic flow liquid flowing direction and magnetic direction
(2) fluid course of the magnetic flow liquid in magnetic gap space.For (1), magnetic flow liquid is typically flowed into direction and magnetic
Field direction is vertical.Length for (2) due to increase magnetic flow liquid in magnetic gap space can be then caused when not adding magnetic field, gateway
Pressure difference it is larger, and make valve arrangement complicated, volume increase.
Meanwhile, in digital valve control, PWM controls are conventional methods, and PWM controls are alternatively referred to as pulsewidth modulation, mainly
It is equally to obtain to need the shape and amplitude of waveform by the width of modulated pulse signal.But due to coil inductance effect,
When valve port is opened and closed, a lag time is always had, and this time is relevant with the structure of valve, to be changed
Lag time needs to change the structure of valve.
The content of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of new magnetorheological digital valve and its controlling party
Method, a kind of new MR valve structure is proposed from another angle, MR valve is had very big control range, not only
Big flow control can be realized, less differential pressure flow control can be also carried out；Simultaneously for the switch of valve port, due to valve itself
The limitation of structure, is cooperated so that can reduce lag time on the original basis, solve prior art using three power supplys
MR valve valve port open and close when the problems such as occur delayed.
In order to solve the above technical problems, the present invention is achieved by the following technical solutions：
The present invention provides a kind of new magnetorheological digital valve and its control method, including valve body, valve seat, armature, valve element and
Sleeve is cased with static iron core, the valve body, the sleeve is slidably matched with armature, and the armature is connected with valve element；The quiet iron
Core is fixed in sleeve, and first coil is wound with the static iron core；Plug, baffle ring are fixed with successively at the valve seat oil inlet
With the second magazine, the second coil is wound with second magazine, second magazine is by magnetic conductor and inverse
The ring body of magnet composition, second magazine constitutes the annular passage of magnetic flow liquid with valve element；Second magazine
It is fixed on by plug and baffle ring in valve seat port；The valve body is interconnected and fixed with valve seat, the two pairs of posts difference
It is connected with the terminal of first coil and the second coil, valve element displacement between plug and static iron core；The armature and quiet iron
Spring is provided between core, promotes armature spool end is closed plug under the action of the spring；Electric generation magnetic is obtained in first coil
Flux, armature is adsorbed onto on static iron core, and band movable valve plug movement, valve port is opened.
The armature constitutes beating type electromagnet with static iron core, and the electromagnet is cooperated using three power supplys, voltage point
Not Wei 24V, 48V, -24V, controlled using single-chip microcomputer, pass through host computer input signal, including valve port closure and uninterrupted two
Control process：
One, under the effect of host computer input signal, control valve port closing course；
Within the t1-t2 times, 48V power supplys are loaded into first coil, electric current is quickly raised to close to critical current,
Control valve element is quickly moved, and valve port is opened；
In Ton remaining part-time, 24V rated voltages are loaded into first coil, produce static iron core stable
Magnetic flux and adsorb armature, stable valve element makes valve port be in open mode；
At the t3-t4 moment in Toff, because the inductance of first coil is acted on, first coil is had residual current, make armature
Attracting state is still in, -24V a backward voltage is added in first coil, the residual current that first coil is produced is eliminated, soon
Speed closure valve port, reduces dead time；
Two, control the discharge process of valve port magnetic flow liquid；
When first coil obtains electric, valve element is opened, when valve port is opened, and magnetic flow liquid is entered by the oil inlet of plug,
Second magazine constitutes the annular passage of magnetic flow liquid with valve element, and the electric current of the second coil, magnetic are controlled by single-chip microcomputer
Rheology liquid adjusts the viscosity of magnetic flow liquid under the magnetic field force effect of different electric currents, and then controls flow.
Further, the inverse magnet is the magnetism-isolating loop that diamagnetic material is made, and is fixed with magnetic conductor by gluing mode.
Magnetism-isolating loop main function is exactly to allow magnetic circuit to produce branch, prevents magnetic loop short circuit, general material brass, 0Cr18Ni9.
Further, the magnetic field force be the second coil obtain it is electric after, magnetic field force bypasses inverse magnet, goes out from magnetic conductor
Go, enter the annular passage that the second magazine constitutes magnetic flow liquid with valve element.
Further, the first coil is connected in a pairs of posts, and second coil is connected in another pairs of posts.
Further, the valve element is made up of nonferromagnetic material.
The invention has the advantages that：Using from different MR valve structure in the past, MR valve is significantly greatly increased
Control range.There is superior seal simultaneously, and multiple control modes can be used, it is adaptable to a variety of occasions.And
A high speed valve can be turned into when without using magnetic flow liquid, and with the response time being exceedingly fast.
Certainly, any product for implementing the present invention it is not absolutely required to while reaching all the above advantage.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, used required for being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ability
For the those of ordinary skill of domain, on the premise of not paying creative work, it can also be obtained according to these accompanying drawings other attached
Figure.
Fig. 1 is a kind of structural profile schematic diagram of new magnetorheological digital valve and its control method of the present invention；
Fig. 2 illustrates for a kind of second magazine structural profile of new magnetorheological digital valve and its control method of the present invention
Figure；
Fig. 3 is a kind of magnetic field force structure distribution figure of new magnetorheological digital valve and its control method of the present invention；
Fig. 4 is a kind of pwm signal figure of new magnetorheological digital valve and its control method of the present invention；
Fig. 5 cooperates and single supply work for a kind of three power supplys of new magnetorheological digital valve and its control method of the present invention
The voltage pattern of coil when making；
Fig. 6 cooperates and single supply work for a kind of three power supplys of new magnetorheological digital valve and its control method of the present invention
The map of current of coil when making；
Fig. 7 is a kind of spool displacement figure of new magnetorheological digital valve and its control method of the present invention；
Wherein：1- nuts, 2- valve bodies, the O-ring seals of 3- second, the O-ring seals of 4- the 3rd, 5- sleeves, 6- valve seats, 7-
Two coil framework, 8- back-up rings, the O-ring seals of 9- the 5th, the O-ring seals of 10- the 4th, 11- plugs, 12- baffle rings, the lines of 13- second
Circle, 14- valve elements, 15- armature, 16- first coil frameworks, 17- static iron cores, 18- outer sleeves, 19- buting iron, 20- insulation sleeves, 21-
First O-ring seal, 22- vinyl covers, 23- hex nuts, 24- nut caps, 25- binding posts, 26- first coils, 701- magnetic conductions
Body, 702- is against magnet, 703- magnetic field forces, 704- magnetic flow liquids.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is all other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Refer to shown in Fig. 1-7, it is of the invention for a kind of new magnetorheological digital valve and its control method, including valve body 2, valve
Sleeve 5, sleeve 5 and rank are cased with seat 6, armature 15, valve element 14, static iron core 17, buting iron 19 and two binding posts 25, valve body 2
Iron 15 is slidably matched, and armature 15 is connected with valve element 14；Static iron core 17 is fixed in sleeve 5, and First Line is wound with static iron core 17
Circle 26；
It is fixed with plug 11, the magazine 7 of baffle ring 12 and second, the second magazine 7 and twines successively at the oil inlet of valve seat 6
Be wound with the second coil 13, the ring body that the second magazine 7 is made up of magnetic conductor 701 and inverse magnet 702, the second magazine 7 with
Valve element 14 constitutes the annular passage of magnetic flow liquid 704；Second magazine 7 is fixed on the end of valve seat 6 by plug 11 and baffle ring 12
It is intraoral；
Valve body 2 is interconnected and fixed with valve seat 6, the end of two pairs of posts 25 respectively with the coil 13 of first coil 26 and second
Son connection, the displacement between plug 11 and static iron core 17 of valve element 14；Spring is provided between armature 15 and static iron core 17, in spring
Effect is lower to promote armature 15 to make the end-enclosed plug 11 of valve element 14；Electric generation magnetic flux is obtained in first coil 26, armature 15 is inhaled
It is attached on static iron core 17, band movable valve plug 14 is moved, and valve port is opened.
Armature 15 constitutes beating type electromagnet with static iron core 17, first coil framework 16, and the electromagnet uses three power supplys
Cooperate, voltage is respectively 24V, 48V, -24V, is controlled using single-chip microcomputer, passes through host computer input signal；When positioned at first
First coil 26 at magazine 16 obtains electric, and valve element 14 is opened, and when valve port is opened, magnetic flow liquid 704 passes through plug 11
Oil inlet enters, and the annular passage of magnetic flow liquid 704 is constituted with valve element 14 in the second magazine 7, passes through single-chip microcomputer control the
Two coil 13 obtains electric, and magnetic flow liquid 704 adjusts the viscosity of magnetic flow liquid 704 in the case where the magnetic field force 703 of different electric currents is acted on, and then
Control flow.
As shown in Figure 4, host computer input signal effect under, within the t1-t2 times, coil voltage as shown in Figure 5,
48V power supplys are loaded into first coil 26, electric current is quickly raised to close to critical current, as shown in Figure 6；Ton's
Remaining part-time, 24V rated voltages are loaded into first coil 26, can so not change the first coil 26 of valve
In the case of structure, the response time is improved, while will not have an impact to the security performance of valve；The t3-t4 moment in Toff, due to
The inductance effect of first coil 26, makes first coil 26 have residual current, armature 15 is still in attracting state, in first coil
Add -24V a backward voltage on 26, the residual current that first coil 26 is produced is eliminated, now, because residual current is smaller,
Valve element 14 can be retracted rapidly, so can reduce lag time, improve the response time of system.(accompanying drawing 4, accompanying drawing 5, the and of accompanying drawing 6
In accompanying drawing 7, dotted line represents the collaborative work of three power supplys, and solid line represents the situation for there was only 24V power works).
Wherein as shown in Figure 2, inverse magnet 702 is the magnetism-isolating loop that diamagnetic material is made, with magnetic conductor 701 by gluing
Mode is fixed.Magnetism-isolating loop main function is exactly to allow magnetic circuit to produce branch, prevents magnetic loop short-circuit, general material brass,
0Cr18Ni9。
Wherein as shown in Figure 3, magnetic field force 703 be the second coil 13 it is electric after, simultaneously because magnetism-isolating loop is by relative
Diamagnetism material of the magnetic conductivity less than 1 is made, and magnetic field force 703 bypasses inverse magnet 702, goes out, enters from magnetic conductor 701
Second magazine 7 constitutes the annular passage of magnetic flow liquid 704 with valve element 14.Because magnetic flow liquid 704 magnetic field force induced 703 is made
With causing the viscosity of magnetic flow liquid 704 to change, so as to control flow and pressure difference.Magnetic field enters magnetic flow liquid 704
Direction is vertical with the flow direction of magnetic flow liquid 704, therefore can effectively control magnetic flow liquid 704, reduces energy loss.
Wherein, valve element 14 is made up of nonferromagnetic material.
Wherein, it is fixed with static iron core 17 on first coil framework 16, first coil framework 16 and is wound with first coil 26,
First coil framework 16 is made up of magnetic material.
Wherein, the coil 13 of first coil 26 and second is homogenous configuration and material, and first coil 26 is connected to a pairs of posts
On 25, the second coil 13 is connected in another pairs of posts 25.
Wherein, the port of valve body 2 passes through the fixes sleeve 5 of nut 1；The outside of static iron core 17 is cased with outer sleeve 18；Vinyl cover 22 with
The contact surface of insulation sleeve 20 is provided with the first O-ring seal 21；The second O-ring seal 3 is provided between buting iron 19 and sleeve 5；Sleeve 5
The 3rd O-ring seal 4 is provided between valve body 2；The 4th O-ring seal 10 is provided between plug 11 and valve seat 6；The outside of valve seat 6
Provided with the 5th O-ring seal 9, the 5th O-ring seal 9 is fixed by back-up ring 8；Buting iron 19 is fixed on the end of sleeve 5, the end of buting iron 19
Portion, which is fixed with insulation sleeve 20 and vinyl cover 22, vinyl cover 22, is fixed with four binding posts 25, and insulation sleeve 20 and vinyl cover 22 are used
Insulated in link post 25 and guarantee.
Present invention disclosed above preferred embodiment is only intended to help and illustrates the present invention.Preferred embodiment is not detailed
All details of narration, it is only described embodiment that the invention is not limited yet.Obviously, according to the content of this specification,
It can make many modifications and variations.This specification is chosen and specifically describes these embodiments, is to preferably explain the present invention
Principle and practical application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and its four corner and equivalent.
Claims (6)
1. a kind of new magnetorheological digital valve, including valve body (2), valve seat (6), armature (15), valve element (14), static iron core (17) and
Two pairs of posts (25), it is characterised in that：
Sleeve (5) is cased with the valve body (2), the sleeve (5) is slidably matched with armature (15), the armature (15) and valve element
(14) connect；The static iron core (17) is fixed in sleeve (5), and first coil (26) is wound with the static iron core (17)；
Plug (11), baffle ring (12) and the second magazine (7), described second are fixed with successively at valve seat (6) oil inlet
The second coil (13) is wound with magazine (7), second magazine (7) is by magnetic conductor (701) and inverse magnet (702)
The ring body of composition, second magazine (7) constitutes the annular passage of magnetic flow liquid (704) with valve element (14)；Described second
Magazine (7) is fixed in valve seat (6) port by plug (11) and baffle ring (12)；
The valve body (2) is interconnected and fixed with valve seat (6), two pairs of posts (25) respectively with first coil (26) and
The terminal connection of two coil (13), the valve element (14) displacement between plug (11) and static iron core (17)；The armature (15)
Spring is provided between static iron core (17), promotes armature (15) to make valve element (14) end-enclosed plug under the action of the spring
(11)；Electric generation magnetic flux is obtained in first coil (26), armature (15) is adsorbed onto on static iron core (17), band movable valve plug (14) is moved
Dynamic, valve port is opened.
2. the new magnetorheological digital valve of one kind according to claim 1, it is characterised in that the inverse magnet (702) is anti-
The magnetism-isolating loop that magnetic material is made, is fixed with magnetic conductor (701) by gluing mode.
3. the new magnetorheological digital valve of one kind according to claim 1, it is characterised in that the first coil (26) is connected to
In one pairs of posts (25), second coil (13) is connected in another pairs of posts (25).
4. the new magnetorheological digital valve of one kind according to claim 1, it is characterised in that the valve element (14) is non-ferromagnetic
Material is made.
5. a kind of control method of new magnetorheological digital valve, it is characterised in that:Including valve body (2), valve seat (6), armature (15),
Valve element (14), static iron core (17) and two pairs of posts (25)；
Sleeve (5) is cased with the valve body (2), the sleeve (5) is slidably matched with armature (15), the armature (15) and valve element
(14) connect；The static iron core (17) is fixed in sleeve (5), and first coil (26) is wound with the static iron core (17)；
Plug (11), baffle ring (12) and the second magazine (7), described second are fixed with successively at valve seat (6) oil inlet
The second coil (13) is wound with magazine (7), second magazine (7) is by magnetic conductor (701) and inverse magnet (702)
The ring body of composition, second magazine (7) constitutes the annular passage of magnetic flow liquid (704) with valve element (14)；Described second
Magazine (7) is fixed in valve seat (6) port by plug (11) and baffle ring (12)；
The valve body (2) is interconnected and fixed with valve seat (6), two pairs of posts (25) respectively with first coil (26) and
The terminal connection of two coil (13), the valve element (14) displacement between plug (11) and static iron core (17)；The armature (15)
Spring is provided between static iron core (17), promotes armature (15) to make valve element (14) end-enclosed plug under the action of the spring
(11)；Electric generation magnetic flux is obtained in first coil (26), armature (15) is adsorbed onto on static iron core (17), band movable valve plug (14) is moved
Dynamic, valve port is opened；
The armature (15) constitutes beating type electromagnet with static iron core (17), and the electromagnet is cooperated using three power supplys, electricity
Pressure is respectively 24V, 48V, -24V, is controlled using single-chip microcomputer, passes through host computer input signal, including valve port closure and uninterrupted
Two control process：
One, under the effect of host computer input signal, control valve port closing course；
Within the t1-t2 times, 48V power supplys are loaded into first coil (26), electric current is quickly raised to close to critical current,
Control valve element (14) quickly mobile, valve port is opened；
In Ton remaining part-time, 24V rated voltages are loaded into first coil (26), static iron core (17) is produced
The magnetic flux of stabilization simultaneously adsorbs armature (15), stable valve element (14), valve port is in open mode；
At the t3-t4 moment in Toff, because the inductance of first coil (26) is acted on, first coil (26) is had residual current, make
Armature (15) is still in attracting state, and -24V a backward voltage is added in first coil (26), and first coil (26) is produced
Residual current eliminate, quick-make valve port, reduce dead time；
Two, the discharge process of control valve port magnetic flow liquid (704)；
When first coil (26) obtains electric, valve element (14) is opened, and when valve port is opened, magnetic flow liquid (704) passes through plug (11)
Oil inlet enters, and constitutes the annular passage of magnetic flow liquid (704) in second magazine (7) and valve element (14), passes through list
Piece machine controls the electric current of the second coil (13), and magnetic flow liquid (704) adjusts magnetic current under magnetic field force (703) effect of different electric currents
Become the viscosity of liquid (704), and then control flow.
6. a kind of control method of new magnetorheological digital valve according to claim 5, it is characterised in that the magnetic field force
(703) be the second coil (13) it is electric after, magnetic field force (703) bypasses inverse magnet (702), goes out, enters from magnetic conductor (701)
Enter to the second magazine (7) and valve element (14) to constitute the annular passage of magnetic flow liquid (704).
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| CN201510572052.0A CN105179785B (en) | 2015-09-09 | 2015-09-09 | A kind of new magnetorheological digital valve and its control method |
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| CN201510572052.0A CN105179785B (en) | 2015-09-09 | 2015-09-09 | A kind of new magnetorheological digital valve and its control method |
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| CN105179785B true CN105179785B (en) | 2017-09-26 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108626473B (en) * | 2017-08-29 | 2019-10-25 | 李占江 | Intelligent electronic network interconnection type valve controller program application method |
| CN108956124B (en) * | 2018-09-06 | 2019-12-06 | 合肥工业大学 | Automatic test and calibration platform for time response characteristics of electro/magneto-rheological actuator |
| CN110852014B (en) * | 2019-11-15 | 2022-04-22 | 华南理工大学 | Electromagnetic valve performance analysis method based on multi-physical-field optimization |
| CN116484974B (en) * | 2023-04-25 | 2023-11-03 | 大连祥瑞阀门制造有限公司 | Flow control system of jetting valve based on magneto-rheological technology |
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|---|---|---|---|---|
| JPH1038125A (en) * | 1996-07-18 | 1998-02-13 | Aisin Seiki Co Ltd | Solenoid valve |
| US6199587B1 (en) * | 1998-07-21 | 2001-03-13 | Franco Shlomi | Solenoid valve with permanent magnet |
| CN201547282U (en) * | 2009-10-19 | 2010-08-11 | 中国航天科技集团公司烽火机械厂 | Digital response switch valve |
| CN201844096U (en) * | 2010-10-08 | 2011-05-25 | 河南航天压力元件有限公司 | Electromagnetic valve for natural gas |
-
2015
- 2015-09-09 CN CN201510572052.0A patent/CN105179785B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1038125A (en) * | 1996-07-18 | 1998-02-13 | Aisin Seiki Co Ltd | Solenoid valve |
| US6199587B1 (en) * | 1998-07-21 | 2001-03-13 | Franco Shlomi | Solenoid valve with permanent magnet |
| CN201547282U (en) * | 2009-10-19 | 2010-08-11 | 中国航天科技集团公司烽火机械厂 | Digital response switch valve |
| CN201844096U (en) * | 2010-10-08 | 2011-05-25 | 河南航天压力元件有限公司 | Electromagnetic valve for natural gas |
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| CN105179785A (en) | 2015-12-23 |
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