CN105299296B - Self-holding electromagnetic valve - Google Patents
Self-holding electromagnetic valve Download PDFInfo
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- CN105299296B CN105299296B CN201410378463.1A CN201410378463A CN105299296B CN 105299296 B CN105299296 B CN 105299296B CN 201410378463 A CN201410378463 A CN 201410378463A CN 105299296 B CN105299296 B CN 105299296B
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- 230000007774 longterm Effects 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 26
- 238000010586 diagram Methods 0.000 description 7
- 238000001179 sorption measurement Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 230000017260 vegetative to reproductive phase transition of meristem Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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Abstract
Even if the present invention is provided one kind and is acted the self-holding electromagnetic valve also steadily and reliably acted using battery.The case where closing flow path (when valve closing) under, to electromagnetic coil apply with the case where opening flow path (when valve opening) compared with the lesser driving voltage of electric energy.Self-holding electromagnetic valve can be with the driving voltage valve closing of the electric energy smaller with valve opening phase, therefore, if even if in this way, being also able to suppress the consumption of battery in the case where acting self-holding electromagnetic valve using battery.Even if as a result, also self-holding electromagnetic valve can be made to act reliably and with long-term and steadily in the case where being acted using battery.
Description
Technical field
The present invention relates to a kind of solenoid valve (self-holding electromagnetic valve), which is being powered and is switching out to electromagnetic coil
Open and-shut mode after closed state, after being able to maintain that switching stopping and being powered.
Background technique
Although self-holding electromagnetic valve needs to be powered when switching valve opening state/closed valve state to electromagnetic coil, tool
Even if electric current is not made to continue such excellent characteristics that flowing is also able to maintain the state of solenoid valve after having finishing switching.Therefore,
It is able to suppress power consumption, is especially widely used as the solenoid valve acted using battery.
The self-holding electromagnetic valve is based on following principle and is acted.Firstly, when being powered to electromagnetic coil, by valve closing bullet
The movable core of spring force is furthered by electromagnetic coil, the spool valve opening set on the end of movable core.In addition, at this point, movable
The end of the opposite side of iron core is contacted with the fixed iron core on the central axis that electromagnetic coil is arranged in, by fixed iron core by forever
Magnet magnetic-adsorption.Therefore, it even if stopping being powered to electromagnetic coil later, is also able to maintain movable core and is drawn to electromagnetic coil
Close state (valve opening state).
On the other hand, under the situation for keeping valve opening state, make the electric current in the direction contrary with when above-mentioned valve opening
It is powered to electromagnetic coil, electromagnetic coil generates the magnetic force for offsetting the direction of permanent magnet magnetic.Therefore, permanent magnet magnetic absorption is movable
The power of iron core weakens, and the end of the movable core contacted with fixed iron core is separated by the active force of valve closing spring, is set to
The spool of the another side of movable core is pressed against valve seat, self-holding electromagnetic valve valve closing.Later, even if stopping electromagnetic coil
Energization, also remain the state (closed valve state) that valve seat is pressed against by the active force spool of valve closing spring.
In addition, proposing so that such self-holding electromagnetic valve reliably acts (especially valve closing movement) as a purpose
The technology being repeatedly powered to electromagnetic coil (patent document 1).
Patent document 1：Japanese Unexamined Patent Publication 5-266539 bulletin
But in the case where acting self-holding electromagnetic valve using battery, in technology set forth above, deposit
It is being difficult to keep self-holding electromagnetic valve reliable and is steadily acting such problems.It is the reason is as follows that described.That is, presented above
Technology in, due to being repeatedly powered to electromagnetic coil, therefore battery is easy to disappear whenever acting self-holding electromagnetic valve
Consumption, when battery consumption, generated voltage value is gradually decreased.If also, voltage value caused by battery continues to reduce, and applies
The voltage value for being added on electromagnetic coil also reduces, so even increasing the number being powered, also self-holding electromagnetic valve can not be made to carry out
Movement.Therefore, on long terms, there are problems that being difficult to make self-holding electromagnetic valve reliable and steadily act.
Summary of the invention
Problems to be solved by the invention
The present invention is completed to cope with the above subject in the prior art, and its purpose is to provide a kind of self-sustainings
Type solenoid valve, the self-holding electromagnetic valve can be reliable in the case where being acted using battery and stablize earthquake
Make.
The solution to the problem
In order to solve the above problems, self-holding electromagnetic valve of the invention uses such as flowering structure.That is,
A kind of self-holding electromagnetic valve, has：
Movable core makes the spool of passage opening/closing be formed in the one end of the movable core, and the movable core is set as energy
It is enough to move in the axial direction；
Valve closing spring is used to exert a force to above-mentioned movable core on the direction that the spool closes the flow path；
Electromagnetic coil is used to be drawn upwardly into above-mentioned movable core in the side that the spool opens the flow path；
Permanent magnet is used to keep the above-mentioned movable core pulled in using the electromagnetic coil；And
Voltage application portion is used to apply driving voltage to above-mentioned electromagnetic coil,
It is characterized in that,
Above-mentioned voltage application portion apply compared with the case where opening the flow path in the case where closing above-mentioned flow path electric energy compared with
Small above-mentioned driving voltage.
In self-holding electromagnetic valve of the invention, the case where closing flow path (when valve closing) under, to electromagnetic coil apply
With the case where opening flow path (when valve opening) compared with the lesser driving voltage of electric energy.It is described after detailed reason, it was found that self-sustaining
Type solenoid valve can be with the driving voltage valve closing of the electric energy smaller with valve opening phase.Thus, the driving applied when if making valve closing
The lesser driving voltage of electric energy compared with voltage is the driving voltage applied when valve opening is then able to suppress for keeping self-hold electric
The consumption of the battery of magnet valve movement.Even if as a result, also can in the case where acting self-holding electromagnetic valve using battery
Act self-holding electromagnetic valve reliably and with long-term and steadily.
In addition, being also possible to apply in the case where closing flow path in above-mentioned self-holding electromagnetic valve of the invention
With the lesser driving voltage of absolute value of comparison with voltage value the case where opening flow path.
If it does, being able to suppress the consumption of battery due to the electric energy of the driving voltage applied when can reduce valve closing.
Even if as a result, can also make self-holding electromagnetic valve reliable in the case where being acted using battery and steadily act.
In addition, being also possible to apply in the case where closing flow path in above-mentioned self-holding electromagnetic valve of the invention
The shorter driving voltage of application time compared with the case where opening flow path.
Even so, due to the electric energy of the driving voltage applied when can reduce valve closing, also it is able to suppress battery
Consumption, even if can also make self-holding electromagnetic valve reliably and steadily as a result, in the case where being acted using battery
Movement.
Detailed description of the invention
Fig. 1 is lock-up valve (ラ ッ チ man's cap used in ancient times) 100 internal structure and the explanatory diagram of operating principle of the present embodiment.
Fig. 2 is the explanatory diagram for showing the voltage waveform for applying driving voltage to electromagnetic coil 102.
The explanation that the size for the electromagnetic force that electromagnetic coil 102 should generate when Fig. 3 is to 100 valve opening of lock-up valve is illustrated
Figure.
The explanation that the size for the electromagnetic force that electromagnetic coil 102 should generate when Fig. 4 is to 100 valve closing of lock-up valve is illustrated
Figure.
Fig. 5 is to illustrate the explanatory diagram of the voltage waveform of variation.
Specific embodiment
Fig. 1 is to show the internal structure of the self-holding electromagnetic valve (hereinafter referred to as lock-up valve) 100 of the present embodiment and move
Make the explanatory diagram of principle.Fig. 1 (a) shows the cross-sectional view of the lock-up valve 100 of closed valve state, and Fig. 1 (b) shows the locking of valve opening state
The cross-sectional view of valve 100.Firstly, (a) is illustrated the general internal structure of lock-up valve 100 referring to Fig.1.
As shown in Fig. 1 (a), lock-up valve 100 has：Electromagnetic coil 102 is formed as hollow big by winding cables
Cause cylindrical shape；Movable core 104 is inserted into the central axis of its electromagnetic coil 102 with the state that can be slided；Fixed iron
The heart 106 is fixed on the position more against the top than movable core 104 in the central axis of electromagnetic coil 102；The permanent magnetism of circular plate shape
Iron 108 is set as the upper-end contact with fixed iron core 106；Spool 110 is mounted on the lower end of movable core 104；Valve closing
Spring 112, along the direction force for pulling out movable core 104 out of electromagnetic coil 102 central axis；And voltage application portion
114, apply driving voltage to electromagnetic coil 102.In addition, being provided with the opening of flow path 200 in the position opposite with spool 110
Portion 202 under the closed valve state of lock-up valve 100 shown in Fig. 1 (a), is blocked using the spool 110 to be exerted a force by valve closing spring 112
Opening portion 202, flow path 200 are formed as the state closed.
The lock-up valve 100 of such construction acts as follows.Firstly, under closed valve state shown in Fig. 1 (a), from
Voltage application portion 114 applies the driving voltage of positive direction to electromagnetic coil 102.Here, so-called " voltage of positive direction " refers to
The voltage in the direction of magnetic force caused by electromagnetic coil 102 direction identical with the direction of the magnetic force of permanent magnet 108.Then, quilt
The movable core 104 that valve closing spring 112 exerts a force is pulled up by the magnetic force of electromagnetic coil 102, as a result, spool 110 leaves stream
The opening portion 202 on road 200, lock-up valve 100 are in valve opening state (referring to Fig.1 (b)).
In addition, if pulling up movable core 104, the upper end of movable core 104 and fixed iron core using electromagnetic coil 102
106 lower end abuts.Then, the magnetic force of permanent magnet 108 efficiently acts on movable core 104 via fixed iron core 106, movably
Iron core 104 is attracted by the magnetic force using the magnetic force of permanent magnet 108 in fixed iron core 106.In this way, even if in movable core 104 by magnetic
Stop being powered from voltage application portion 114 to electromagnetic coil 102 after power absorption, movable core is also remain as shown in Fig. 1 (b)
104 be pulled up after state (valve opening state).
On the other hand, in the state of after using the magnetic force of permanent magnet 108 pull-up movable core 104, from voltage application portion
114 apply the driving voltage of negative direction to electromagnetic coil 102.Here, so-called " voltage of negative direction " refers to electromagnetic coil
The voltage in the contrary direction of the magnetic force in the direction and permanent magnet 108 of magnetic force caused by 102.Then, due to permanent magnet
108 magnetic force is offset by the magnetic force of electromagnetic coil 102, therefore can be overcome and be made by the spring of compressed valve closing spring 112 is counter
Magnetic-adsorption firmly is carried out to movable core 104.As a result, being fixed the upper end of the movable core 104 of 106 magnetic-adsorption of iron core
It is pulled away from fixed iron core 106 by the reactive spring force of valve closing spring 112, forms the spool 110 of the lower end of movable core 104
It is pressed against the state (closed valve state) of the opening portion 202 of flow path 200.In this way, lock-up valve 100 be formed as closed valve state it
Afterwards, even if stopping being powered to electromagnetic coil 102, it also can use the power holding closed valve state that valve closing spring 112 presses spool 110
(referring to Fig.1 (a)).
In the lock-up valve 100 as above acted, the driving voltage that usually makes to apply when valve opening (hereinafter referred to as valve opening when drive
Dynamic voltage) positive and negative phase be used as driving voltage when valve closing (driving voltage) hereinafter referred to as applied when valve closing instead.But
In the present embodiment, the positive and negative of driving voltage when will not only make valve opening opposite also reduces voltage value (precisely voltage value
Absolute value) and shorten driving voltage of the driving voltage of application time as valve closing when.
Used driving voltage when 100 valve opening of lock-up valve or valve closing using the present embodiment is shown in FIG. 2.That is, opening
The voltage value of driving voltage when valve is set as Va, and application time is set as To, the voltage value setting of driving voltage when valve closing
For-Vb, application time is set as Tc.Here, driving voltage when valve closing is direction and the valve opening that " negative " voltage value indicates voltage
When driving voltage it is contrary.In addition, by the electric current that is flowed in electromagnetic coil 102 and the voltage value that is applied at than
Example, therefore the electric current flowed in electromagnetic coil 102 when valve closing is smaller than the electric current flowed when valve opening.As a result, drive when valve closing
The electric energy of driving voltage when the electric energy (=voltage value × current value × application time) of dynamic voltage is than valve opening is small, therefore can press down
The consumption of battery processed.In addition, following reason is based on, even if driving when driving voltage when lock-up valve 100 is with valve closing is than valve opening
The small electric energy of voltage also can be acted reliably.
Fig. 3 is the electromagnetic force (electromagnetic force when valve opening) for showing electromagnetic coil 102 necessary in order to make 100 valve opening of lock-up valve
Size explanatory diagram.Fig. 3 (a) shows the state (closed valve state) before making 100 valve opening of lock-up valve.In addition, Fig. 3 (b) shows lock
Determining valve 100 will state before the valve opening state (before movable core 104 will be contacted with fixed iron core 106).In addition,
The figure of the opening portion 202 of electromagnetic coil 102, flow path 200 is omitted in order to avoid attached drawing is loaded down with trivial details in Fig. 3 (a), Fig. 3 (b)
Show.
As shown in Fig. 3 (a), under the closed valve state of lock-up valve 100, be formed as spool 110 by valve closing spring 112 by by
It is pressed on the state of the opening portion 202 of flow path 200.In order to make 100 valve opening of lock-up valve, it is necessary to compress valve closing spring from the state on one side
112 pull up movable core 104 on one side.Therefore, electromagnetic coil 102, which needs to be pulled up with movable core 104, generates biggish electricity
Magnetic force.Certainly, it is contacted in movable core 104 with fixed iron core 106 after being formed as valve opening state to lock-up valve 100, it can
Movable core 104 is kept using the magnetic force of permanent magnet 108, but before movable core 104 will be contacted with fixed iron core 106,
The magnetic force of permanent magnet 108 can not be made to effectively act on movable core 104.Therefore, as shown in Fig. 3 (b), it is in lock-up valve 100
In the state of being formed before valve opening state, electromagnetic force caused by electromagnetic coil 102 is maximum (to be equal to or more than compressed
The size of the reactive spring force of valve closing spring 112).Also, as well-known, the electromagnetic force and electromagnetic wire of electromagnetic coil 102
The current value of circle 102 is directly proportional, and current value is directly proportional to the voltage value for being applied to electromagnetic coil 102, therefore, larger in order to generate
Electromagnetic force, it is necessary to electromagnetic coil 102 apply high-voltage value voltage.In general, the driving voltage when valve opening of lock-up valve 100
It is set as that the voltage value of maximum electromagnetic force (electromagnetic force of Fig. 3 (b)) can be generated by this method.
Fig. 4 be show electromagnetic coil 102 necessary to making 100 valve closing of lock-up valve electromagnetic force (electromagnetic force when valve closing) it is big
Small explanatory diagram.Fig. 4 (a) shows the state (valve opening state) before making 100 valve closing of lock-up valve.In addition, Fig. 4 (b) is shown valve closing
When driving voltage be applied to electromagnetic coil 102 moment state.In addition, in Fig. 4 (a), Fig. 4 (b), in order to avoid attached drawing
Diagram loaded down with trivial details and that electromagnetic coil 102 is omitted.
As shown in Fig. 4 (a), under the valve opening state of lock-up valve 100, movable core 104 utilizes the magnetic force quilt of permanent magnet 108
Magnetic-adsorption is in fixed iron core 106.At this point, permanent magnet 108 is set as comparing to the size of 104 bring magnetic adsorbability of movable core
It is big by the reactive spring force of compressed valve closing spring 112, therefore lock-up valve 100 maintains valve opening state.In order to from the shape
State makes 100 valve closing of lock-up valve, as shown in Fig. 4 (b), as long as generating the electromagnetic force for offsetting the direction of magnetic adsorbability of permanent magnet 108,
Magnetic adsorbability is set to be lower than the reactive spring force of valve closing spring 112.That is, if can be than shown in filled arrows in attached drawing
The big electromagnetic force of the difference of the absolute value of reactive spring force shown in the arrow with oblique line is supported in the absolute value and figure of magnetic adsorbability
Demagnetization adsorption capacity can then be such that the movable core 104 for being fixed 106 magnetic-adsorption of iron core is pulled away from from fixed iron core 106.Also,
If movable core 104 leaves fixed iron core 106, the magnetic force of permanent magnet 108 does not act on movable core 104, therefore being capable of benefit
Make 100 valve closing of lock-up valve with the reactive spring force of valve closing spring 112.
From the description above it is clear that in order to make 100 valve opening of lock-up valve, need to overcome the spring of valve closing spring 112 anti-
Active force and the electromagnetic force for pulling up the size of movable core 104, in contrast, in order to make 100 valve closing of lock-up valve, as long as generating phase
When the electromagnetic force of the size of the difference of the reactive spring force of the magnetic adsorbability and valve closing spring 112 in permanent magnet 108.Cause
This, the electricity of the driving voltage when absolute value (Vb in Fig. 2) of the voltage value of driving voltage when valve closing can be set as than valve opening
The small value of the absolute value (Va in Fig. 2) of pressure value.In addition, in valve opening, it is necessary to be connect in movable core 104 and fixed iron core 106
It is continuously applied driving voltage before touching, but in valve closing, as long as applying drive when being pulled away from movable core 104 from fixed iron core 106
Dynamic voltage.Therefore, the driving voltage when application time (Tc in Fig. 2) of driving voltage when can make valve closing is than valve opening
Application time (To in Fig. 2) it is short.As a result, electric energy (=voltage value × current value × application of driving voltage when valve closing
Time) become smaller, therefore it is able to suppress the consumption of battery.Based on such reason, even if the lock-up valve 100 of the present embodiment is using
Battery can also act reliably and with long-term and steadily in the case where being acted.
In addition, in the above-described embodiments, compared with driving voltage of driving voltage when valve opening when illustrating valve closing, voltage
The absolute value of value is smaller, and application time is shorter (referring to Fig. 2).But if electric energy becomes smaller, additionally it is possible to use the absolute of voltage value
Though be worth small but application time it is not short driving voltage or application time be short but the no small driving voltage of absolute value of voltage value.
Fig. 5 instantiates the driving voltage of such variation.Driving voltage in the example shown in Fig. 5 (a), when valve closing
Compared with driving voltage when valve opening, though the absolute value of voltage value is small, application time is not short.But even if in such feelings
Under condition, if inhibiting electric energy (=voltage value × magnitude of current × application time), it is able to suppress the consumption of battery.Therefore, even if
Using battery, also lock-up valve 100 can be made to act reliably and with long-term and steadily.In addition, in Fig. 5 (a), although
Application time when valve closing is identical as application time when valve opening, but applying when can also make application time when valve closing than valve opening
It is long between added-time.Nevertheless, as shown in Fig. 5 (a), if identical as the application time of driving voltage is made when valve closing in valve opening,
Switching application time is not needed, therefore the circuit structure of voltage application portion 114 can be simplified.
In addition, in the example shown in Fig. 5 (b), compared with driving voltage of driving voltage when valve opening when valve closing, apply
It is short, but the absolute value of voltage value is not small.But it even if in this case, if inhibiting electric energy, is able to suppress
The consumption of battery.Therefore, being able to use battery acts lock-up valve 100 reliably and with long-term and steadily.In addition, in Fig. 5 (b),
The absolute value of the voltage value of driving voltage when valve closing is equal with the absolute value of the voltage value of driving voltage when valve opening, but can also
So that the absolute value of the voltage value when absolute value of voltage value when valve closing is than valve opening is big.Nevertheless, as shown in Fig. 5 (b), if
Keep the absolute value of voltage value equal in driving voltage in valve opening and driving voltage when valve closing, does not then need to generate absolute value
Different multiple voltage values, therefore the circuit structure of voltage application portion 114 can be simplified.
More than, though the lock-up valve 100 of the present embodiment and variation is illustrated, the present invention is not limited to above-described embodiments
And variation, it can implement in various ways within the scope of its spirit.
Description of symbols
100 ... lock-up valves；102 ... electromagnetic coils；104 ... movable cores；106 ... fixed iron cores；108 ... permanent magnets；
110 ... spools；112 ... valve closing springs；114 ... voltage application portions；200 ... flow paths；202 ... opening portions.
Claims (3)
1. a kind of self-holding electromagnetic valve, has：
Movable core makes the spool of passage opening/closing be formed in the one end of the movable core, and be set as can be for the movable core
Axis moves up；
Valve closing spring is used to exert a force to above-mentioned movable core on the direction that the spool closes the flow path；
Electromagnetic coil is used to be drawn upwardly into above-mentioned movable core in the side that the spool opens the flow path；
Permanent magnet is used to keep the above-mentioned movable core pulled in using the electromagnetic coil；And
Voltage application portion is used to apply driving voltage to above-mentioned electromagnetic coil,
It is characterized in that,
It is lesser that above-mentioned voltage application portion applies the electric energy compared with the case where opening the flow path in the case where closing above-mentioned flow path
Above-mentioned driving voltage.
2. self-holding electromagnetic valve according to claim 1, which is characterized in that
Above-mentioned voltage application portion apply in the case where closing above-mentioned flow path with open the flow path the case where comparison with voltage value it is exhausted
To the lesser above-mentioned driving voltage of value.
3. self-holding electromagnetic valve according to claim 1 or 2, which is characterized in that
It is shorter that above-mentioned voltage application portion applies the time compared with the case where opening the flow path in the case where closing above-mentioned flow path
Above-mentioned driving voltage.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378463.1A CN105299296B (en) | 2014-08-01 | 2014-08-01 | Self-holding electromagnetic valve |
| HK16102545.8A HK1214642A1 (en) | 2014-08-01 | 2016-03-07 | Self-retaining solenoid vavle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410378463.1A CN105299296B (en) | 2014-08-01 | 2014-08-01 | Self-holding electromagnetic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105299296A CN105299296A (en) | 2016-02-03 |
| CN105299296B true CN105299296B (en) | 2018-11-16 |
Family
ID=55196901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410378463.1A Expired - Fee Related CN105299296B (en) | 2014-08-01 | 2014-08-01 | Self-holding electromagnetic valve |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN105299296B (en) |
| HK (1) | HK1214642A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159045A (en) * | 1995-12-05 | 1997-06-17 | Rinnai Corp | Combustion equipment |
| CN2257882Y (en) * | 1996-04-16 | 1997-07-16 | 黄岩恒光制冷配件厂 | Monostable pulse electromagnetic valve |
| CN2278129Y (en) * | 1996-06-18 | 1998-04-08 | 绍兴市自动化仪表厂 | Low consumption low voltage energy-saving electromagnetic valve |
| CN202629271U (en) * | 2012-04-19 | 2012-12-26 | 余姚市永创电磁阀有限公司 | Self-hold electromagnetic valve |
-
2014
- 2014-08-01 CN CN201410378463.1A patent/CN105299296B/en not_active Expired - Fee Related
-
2016
- 2016-03-07 HK HK16102545.8A patent/HK1214642A1/en not_active IP Right Cessation
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09159045A (en) * | 1995-12-05 | 1997-06-17 | Rinnai Corp | Combustion equipment |
| CN2257882Y (en) * | 1996-04-16 | 1997-07-16 | 黄岩恒光制冷配件厂 | Monostable pulse electromagnetic valve |
| CN2278129Y (en) * | 1996-06-18 | 1998-04-08 | 绍兴市自动化仪表厂 | Low consumption low voltage energy-saving electromagnetic valve |
| CN202629271U (en) * | 2012-04-19 | 2012-12-26 | 余姚市永创电磁阀有限公司 | Self-hold electromagnetic valve |
Also Published As
| Publication number | Publication date |
|---|---|
| HK1214642A1 (en) | 2016-07-29 |
| CN105299296A (en) | 2016-02-03 |
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