CN202451850U - Novel high-pressure electromagnetic valve - Google Patents
Novel high-pressure electromagnetic valve Download PDFInfo
- Publication number
- CN202451850U CN202451850U CN2012200505962U CN201220050596U CN202451850U CN 202451850 U CN202451850 U CN 202451850U CN 2012200505962 U CN2012200505962 U CN 2012200505962U CN 201220050596 U CN201220050596 U CN 201220050596U CN 202451850 U CN202451850 U CN 202451850U
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Abstract
The utility model provides a high-pressure electromagnetic valve. An aim of opening or closing a main valve port through airflow pressure difference in a high-pressure state is fulfilled by improving the sealing performance of a pilot valve port; when the electromagnetic valve is designed, only the force required for opening a pilot valve is considered; the power consumption of an electromagnetic coil is reduced; and working reliability and stability of the electromagnetic valve are improved. The electromagnetic valve comprises an electromagnetic head, a valve body and a valve core; a valve cavity and a medium inlet and a medium outlet which are communicated with the valve cavity are formed in the valve body, and the main valve port is formed in the valve cavity; the valve core comprises a piston-type main valve core, a pilot valve core and a guide sleeve for accommodating the piston-type main valve core and the pilot valve core; the piston-type main valve core is arranged at the main valve port in the valve cavity; the pilot valve core is coaxially sleeved above the piston-type main valve core through the guide sleeve; the pilot valve port is formed in the center of the upper end face of the piston-type main valve core; and the pilot valve core for plugging the pilot valve port is used for closing a pilot valve head at the pilot valve port in a point closing mode.
Description
Technical field
The utility model relates to the solenoid valve technical field, and particularly a kind of high-pressure solenoid valve is meant that under high pressure conditions (working pressure is at the electromagnetic control apparatus of control fluid break-make of 20MPa～35MPa).
Background technique
Solenoid valve is a kind of common electric controller, and its working principle is to drive opening or closing of valve through the electromagnetic force that electromagnetic coil produces, and is widely used in the automation field of various fluid circuits.Solenoid valve is divided into three major types on the working principle: direct-acting type, step direct-acting type, leading type.In various automation fields, what be full of in the pipeline that many needs open or close is the flowing medium under the high pressure conditions, and working pressure reaches tens MPas, for example; In the transmission control of the clean fuel of vehicle (rock gas that uses like public transit vehicle), the rock gas air pressure of supply station opens or closes such pipeline generally at 20Mpa; The high direct voltage solenoid valves that adopt more, the high direct voltage solenoid valve adopts the leading type structure mostly, and the structure of guide electromagnetic valve generally comprises main valve, pilot valve (secondary valve); When solenoid valve need open or cut out, by solenoid controlled pilot valve (secondary valve) action, during energising; Under the effect of electromagnetic force, at first open pilot valve, after the poppet port pressure release; Low high pressure reduction on around main valve, forming, hydrodynamic pressure promotes main valve and moves up valve open; During outage, utilize Returnning spring power that pilot valve is resetted, close poppet port, through the throttling passage supercharging, make main valve form the low down high pressure reduction of on every side, hydrodynamic pressure promotion main valve moves down throttle down.But; In the pipeline of various high-pressure fluid mediums; The general pressure of flowing medium is very high; Therefore the valve that opens or closes high-pressure fluid medium needs very big driving force, need around main valve, form effective enough big driving force and promote moving up and down of main valve, thereby open or throttle down.In the existing technology; The high-pressure solenoid valve that is used for the high-pressure fluid medium pipeline; During valve working, general pilot valve is at first opened under the effect of electromagnetic force, but after the release; Be difficult to form the enough strong lowly high air-flow differential of going up around the main valve, main valve will just can be opened under the acting in conjunction of the pulling of electromagnetic force and air-flow differential.Therefore the general power of electromagnetic coil of high-pressure solenoid valve that is used for the high-pressure fluid medium pipeline is all bigger, main valve when opening or after opening operating current or keep electric current also bigger, energy consumption is big, cost is high.
The model utility content
Deficiency according to the existing technology existence; The utility model provides a kind of high-pressure solenoid valve; Through improving the sealability of poppet port, be implemented under the high pressure conditions purpose that opens or closes primary valve through air-flow differential, only need consider during design that the pilot valve required power that is opened gets final product; Reduce the power consumption of electromagnetic coil, improved the reliability and stability of the work of solenoid valve.
The technological scheme of the utility model is:
A kind of high-pressure solenoid valve comprises Electrical heads, valve body, spool, it is characterized in that, has valve pocket and medium inlet that is communicated with valve pocket and media outlet in the said valve body, is provided with primary valve in the valve pocket; Said spool comprises piston type main valve plug and guide's spool and holds the piston type main valve plug and the guide thimble of guide's spool; The piston type main valve plug is arranged at the primary valve place in the valve pocket; In piston type main valve plug top, the upper end inner chamber of guide's spool is provided with first Returnning spring to guide's spool through the guide thimble coaxial package; Form between the lower end surface of piston type main valve plug upper-end surface and guide's spool and go up atmospheric pressure cavity, form atmospheric pressure cavity down between piston type main valve plug lower end surface and the primary valve; Have on the said piston type main valve plug and be communicated with the equalizing orifice of going up atmospheric pressure cavity and following atmospheric pressure cavity; Center portion, piston type main valve plug upper-end surface is provided with poppet port; Said poppet port is communicated with media outlet through the relief hole that is through to piston type main valve plug lower end surface, and guide's spool of said shutoff poppet port has guide's valve head of closing poppet port with the mode of a sealing.
Center portion, said piston type main valve plug upper-end surface is the spherical shape convex surface, and said poppet port is positioned at the dot location of spherical shape convex surface, and the said and contacted guide's valve head of poppet port lower end surface is the plane.
Have the equalizing orifice that two levels run through piston type main valve plug sidewall on the said piston type main valve plug.
The cross section gross area of said equalizing orifice is less than the section area of relief hole.
Said piston type main valve plug lower end surface is provided with and the corresponding seal rubber pad of primary valve.
Be provided with seal ring between said piston type main valve plug outer wall and the guide thimble inwall.
Be provided with seal ring between said guide thimble and the valve body upper-end surface.
Said guide's valve head is cylindrical rubber cushion.
Be provided with second Returnning spring between the lower end surface of said piston type main valve plug upper-end surface and guide's spool; The lower end surface of said guide's spool is provided with the spring seat of fixing second Returnning spring, is provided with cushion pad between the spring seat and second Returnning spring.
Adopt the pin Placement to interconnect between said piston type main valve plug and the guide's spool.
The technique effect of the utility model:
A kind of high-pressure solenoid valve that the utility model provides; Through improving the sealability of poppet port; Be implemented under the high pressure conditions purpose that opens or closes primary valve through air-flow differential; Only need consider during design that opening the required power of guide's spool gets final product, reduce the power consumption of electromagnetic coil, improve the reliability and stability of solenoid valve work.The utility model utilizes the geometrical property on sphere and plane dexterously; Poppet port is opened the summit in the piston type main valve plug upper-end surface of spherical shape; Guide's spool of shutoff poppet port and the contacted guide's valve head of poppet port lower end surface are the plane; Guide's valve head is closed poppet port with the mode of a sealing, than the mode of the face closure of existing technology, has improved the sealability of poppet port greatly.The utility model is provided with seal ring on piston type main valve plug outer wall, make can better isolate each other with following atmospheric pressure cavity the last atmospheric pressure cavity of piston type main valve plug generation air-flow differential, more helps producing effective air-flow differential; Simultaneously, the utility model is communicated with the sidewall that the relief hole of going up atmospheric pressure cavity and following atmospheric pressure cavity and the center portion that equalizing orifice vertically runs through the piston type main valve plug respectively and level run through the piston type main valve plug, and the cross section gross area of equalizing orifice is less than the section area of relief hole; Make the effect of atmospheric pressure cavity supercharging and pressure release more obvious: behind the coil electricity, electromagnetic force plays the pilot valve wicking, and poppet port is opened; Relief hole on the piston type main valve plug communicates atmospheric pressure cavity and media outlet; Because the relief hole section area is greater than the equalizing orifice section area, last atmospheric pressure cavity from relief hole to the speed of media outlet discharge gas greater than the medium inlet from the make progress speed of atmospheric pressure cavity air inlet of equalizing orifice, therefore; Last atmospheric pressure cavity pressure can reduce rapidly; Make down atmospheric pressure cavity and last atmospheric pressure cavity produce enough big pressure difference, form upwards thrust, impel primary valve to open; During coil blackout; Electromagnetic force disappears; First Returnning spring at first makes guide's valve core reset, and guide's valve head is closed poppet port with the mode of a sealing, and high-pressure medium is through the rapid supercharging of atmospheric pressure cavity that makes progress of two equalizing orifices; And impel second Returnning spring that main valve plug is pushed open downwards, primary valve is closed; Therefore the utility model can form effectively enough big air-flow differential rapidly around having realized making main valve plug, realizes opening or closing through air-flow differential the purpose of primary valve.Like this, the coil power of the utility model design is significantly less than the power of the high-pressure solenoid valve coil of existing technology, generally is merely 20W; The high more effect of working pressure is obvious more, and operating current 0.8A keeps electric current 0.6A; Temperature rise need not increase the pulse holding circuit less than 60 ℃.In addition; The utility model also adopts the pin Placement that piston type main valve plug and guide's spool are interconnected; When the low-pressure state air-flow differential is too small, also can directly guide's spool and main valve plug be opened or closed through electromagnetic force, further improved the reliability and stability of solenoid valve work.
Description of drawings
Fig. 1 is the high-pressure solenoid valve embodiment's of the utility model a structural representation.
Fig. 2 is the local enlarged diagram at the main valve plug position of Fig. 1.
Reference character is listed as follows:
The 1-Electrical heads, 2-valve body, 3-spool, 4-valve pocket, 5-medium inlet, 6-media outlet; The 7-primary valve, 31-main valve plug, 32-guide's spool, 33-guide thimble, 34-first Returnning spring, 35-guide's valve head; 36-first seal ring, 37-pin, 38-second seal ring, 39-seal rubber pad, the last atmospheric pressure cavity of 41-, atmospheric pressure cavity under the 42-; The 43-equalizing orifice, 44-poppet port, 45-relief hole, 46-second Returnning spring, 47-spring seat, 48-cushion pad.
Embodiment
Embodiment to the utility model is described further below in conjunction with accompanying drawing.
As shown in Figure 1, a kind of high-pressure solenoid valve comprises Electrical heads 1, valve body 2, spool 3, and the medium inlet 5 and media outlet 6 that have valve pocket 4 in the valve body 2 and be communicated with valve pocket 4 are provided with primary valve 7 in the valve pocket 4; Spool 3 comprises piston type main valve plug 31 and guide's spool 32 and holds the piston type main valve plug and the guide thimble 33 of guide's spool; Piston type main valve plug 31 is arranged at primary valve 7 places in the valve pocket 4, and in piston type main valve plug 31 tops, the upper end inner chamber of guide's spool is provided with first Returnning spring 34 to guide's spool 32 through guide thimble 33 coaxial packages; As shown in Figure 2; Local enlarged diagram for the utility model embodiment's main valve plug position; Form between the lower end surface of piston type main valve plug 31 upper-end surfaces and guide's spool 32 and go up atmospheric pressure cavity 41, form atmospheric pressure cavity 42 down between piston type main valve plug 31 lower end surfaces and the primary valve 7; Have on the piston type main valve plug 31 and be communicated with the equalizing orifice 43 of going up atmospheric pressure cavity 41 and following atmospheric pressure cavity 42; Center portion, piston type main valve plug 31 upper-end surface is provided with poppet port 44; Poppet port 44 is communicated with media outlet 6 through the relief hole 45 that is through to piston type main valve plug lower end surface, and guide's spool 32 of shutoff poppet port 44 has guide's valve head 35 of closing poppet port with the mode of a sealing.In the present embodiment, center portion, piston type main valve plug upper-end surface is the spherical shape convex surface, and poppet port 44 is positioned at the dot location of spherical shape convex surface; With the contacted guide's valve head of poppet port 35 lower end surfaces be the plane; Therefore when guide's valve head contacts with poppet port, be sphere and the contacting of plane, be a contact; Therefore can poppet port be closed with the mode of a sealing, improve the sealability of poppet port greatly.In addition; Better isolate for making atmospheric pressure cavity 41 and following atmospheric pressure cavity 42; In the present embodiment; Between piston type main valve plug 31 outer walls and guide thimble 33 inwalls, be provided with first seal ring 36, be provided with second seal ring 38 between guide thimble 33 and valve body 2 upper-end surfaces, piston type main valve plug 31 lower end surfaces are provided with and primary valve 7 corresponding seal rubber pads 39; Guide's valve head 35 is the cylindrical rubber cushion on plane for the lower end surface.Be provided with second Returnning spring 46 between the lower end surface of piston type main valve plug 31 upper-end surfaces and guide's spool 32; The lower end surface of guide's spool 32 is provided with the spring seat 47 of fixing second Returnning spring, is provided with cushion pad 48 between the spring seat 47 and second Returnning spring 46.
Below further specify the utility model and be implemented under the high pressure conditions working procedure that opens or closes primary valve through air-flow differential.The utility model is communicated with the sidewall that the relief hole of going up atmospheric pressure cavity and following atmospheric pressure cavity and the center portion that equalizing orifice vertically runs through the piston type main valve plug respectively and level run through the piston type main valve plug, and the equalizing orifice 43 on the piston type main valve plug is the equalizing orifice that two levels run through piston type main valve plug sidewall, and the cross section gross area of two equalizing orifices 43 is less than the section area of relief hole 45; Make the last atmospheric pressure cavity supercharging and the pressure release better of the utility model like this; During coil electricity, electromagnetic force picks up guide's spool 32, and poppet port 44 is opened; Relief hole 45 on the piston type main valve plug 31 communicates atmospheric pressure cavity 41 and media outlet 6; Because relief hole 45 section area are greater than the total cross-sectional area of equalizing orifice 43, last atmospheric pressure cavity from relief hole to the speed of media outlet discharge gas greater than the medium inlet from the make progress speed of atmospheric pressure cavity air inlet of equalizing orifice, therefore; Last atmospheric pressure cavity pressure can reduce rapidly; Make down atmospheric pressure cavity and last atmospheric pressure cavity produce enough big pressure difference, form upwards thrust, impel primary valve to open; During coil blackout, electromagnetic force disappears, and first Returnning spring 34 at first makes guide's spool 32 reset; Close poppet port 44; High-pressure medium is through the rapid supercharging of atmospheric pressure cavity that makes progress of two equalizing orifices, and impels second Returnning spring that main valve plug is pushed open downwards, and primary valve is closed; Realize opening or closing through air-flow differential basically the purpose of primary valve.
In addition, in the present embodiment, also adopt the pin ways of connecting to interconnect between piston type main valve plug and the guide's spool, be used in the low-pressure state air-flow differential when too small, directly guide's spool and main valve plug are opened or closed through electromagnetic force through pin 37.Should be pointed out that the above embodiment can make those skilled in the art more fully understand the invention, but do not limit the present invention in any way creation.Therefore, although this specification and embodiment have carried out detailed explanation to the invention,, it will be appreciated by those skilled in the art that still and can make amendment or be equal to replacement the invention; And all do not break away from the technological scheme and the improvement thereof of the spirit and scope of the present invention, and it all is encompassed in the middle of the protection domain of the invention patent.
Claims (10)
1. a high-pressure solenoid valve comprises Electrical heads, valve body, spool, it is characterized in that, has valve pocket and medium inlet that is communicated with valve pocket and media outlet in the said valve body, is provided with primary valve in the valve pocket; Said spool comprises piston type main valve plug and guide's spool and holds the piston type main valve plug and the guide thimble of guide's spool; The piston type main valve plug is arranged at the primary valve place in the valve pocket; In piston type main valve plug top, the upper end inner chamber of guide's spool is provided with first Returnning spring to guide's spool through the guide thimble coaxial package; Form between the lower end surface of piston type main valve plug upper-end surface and guide's spool and go up atmospheric pressure cavity, form atmospheric pressure cavity down between piston type main valve plug lower end surface and the primary valve; Have on the said piston type main valve plug and be communicated with the equalizing orifice of going up atmospheric pressure cavity and following atmospheric pressure cavity; Center portion, piston type main valve plug upper-end surface is provided with poppet port; Said poppet port is communicated with media outlet through the relief hole that is through to piston type main valve plug lower end surface, and guide's spool of said shutoff poppet port has guide's valve head of closing poppet port with the mode of a sealing.
2. high-pressure solenoid valve according to claim 1; It is characterized in that; Center portion, said piston type main valve plug upper-end surface is the spherical shape convex surface, and said poppet port is positioned at the dot location of spherical shape convex surface, and the said and contacted guide's valve head of poppet port lower end surface is the plane.
3. high-pressure solenoid valve according to claim 1 is characterized in that, has the equalizing orifice that two levels run through piston type main valve plug sidewall on the said piston type main valve plug.
4. high-pressure solenoid valve according to claim 3 is characterized in that, the cross section gross area of said equalizing orifice is less than the section area of relief hole.
5. high-pressure solenoid valve according to claim 1 is characterized in that, said piston type main valve plug lower end surface is provided with and the corresponding seal rubber pad of primary valve.
6. high-pressure solenoid valve according to claim 1 is characterized in that, is provided with seal ring between said piston type main valve plug outer wall and the guide thimble inwall.
7. high-pressure solenoid valve according to claim 1 is characterized in that, is provided with seal ring between said guide thimble and the valve body upper-end surface.
8. high-pressure solenoid valve according to claim 1 is characterized in that, said guide's valve head is cylindrical rubber cushion.
9. high-pressure solenoid valve according to claim 1 is characterized in that, is provided with second Returnning spring between the lower end surface of said piston type main valve plug upper-end surface and guide's spool; The lower end surface of said guide's spool is provided with the spring seat of fixing second Returnning spring, is provided with cushion pad between the spring seat and second Returnning spring.
10. high-pressure solenoid valve according to claim 1 is characterized in that, adopts the pin Placement to interconnect between said piston type main valve plug and the guide's spool.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200505962U CN202451850U (en) | 2012-02-16 | 2012-02-16 | Novel high-pressure electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012200505962U CN202451850U (en) | 2012-02-16 | 2012-02-16 | Novel high-pressure electromagnetic valve |
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| CN202451850U true CN202451850U (en) | 2012-09-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012200505962U Expired - Lifetime CN202451850U (en) | 2012-02-16 | 2012-02-16 | Novel high-pressure electromagnetic valve |
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| CN (1) | CN202451850U (en) |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927291A (en) * | 2012-10-30 | 2013-02-13 | 宁波开灵气动元件制造有限公司 | Ultrahigh-temperature solenoid valve |
| CN104930244A (en) * | 2014-03-21 | 2015-09-23 | 航空技术空间股份有限公司 | Aerospace solenoid valve for high-pressure cryogenic gas |
| CN105020457A (en) * | 2015-06-29 | 2015-11-04 | 奉化市星宇电子有限公司 | Stepwise direct-action piston type high-pressure-difference electromagnetic valve |
| CN105333205A (en) * | 2015-11-23 | 2016-02-17 | 浙江理工大学 | High-pressure pilot-operated solenoid valve for compressed natural gas automobile |
| CN105673867A (en) * | 2016-04-13 | 2016-06-15 | 湖南凯恩利液压机械制造有限公司 | Electromagnetic valve for water and mechanical device |
| CN105822809A (en) * | 2016-05-26 | 2016-08-03 | 上海舜华新能源系统有限公司 | Electromagnetic actuator mounted on high-pressure gas integrated cylinder valve |
| CN107701763A (en) * | 2017-11-10 | 2018-02-16 | 宁波文泽机电技术开发有限公司 | The ratio one-way flow valves of performance improvement |
| CN107956911A (en) * | 2016-10-14 | 2018-04-24 | 杭州三花研究院有限公司 | A kind of solenoid valve |
| CN108343773A (en) * | 2017-01-25 | 2018-07-31 | 现代自动车株式会社 | Include the solenoid valve of the movable independently guide's stopper head of energy |
| CN110159771A (en) * | 2018-02-13 | 2019-08-23 | 艾欧史密斯(中国)热水器有限公司 | Combine control mechanism |
| CN111692407A (en) * | 2020-06-28 | 2020-09-22 | 中车成都机车车辆有限公司 | Self-sealing gas high-pressure valve |
| CN112483654A (en) * | 2020-10-27 | 2021-03-12 | 北京宇航系统工程研究所 | Quick response solenoid valve |
| CN114458769A (en) * | 2020-11-09 | 2022-05-10 | 英嘉动力科技无锡有限公司 | Quick response's guide's formula solenoid valve structure |
| WO2023179349A1 (en) * | 2022-03-25 | 2023-09-28 | 浙江盾安人工环境股份有限公司 | Pilot-operated solenoid valve |
-
2012
- 2012-02-16 CN CN2012200505962U patent/CN202451850U/en not_active Expired - Lifetime
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102927291A (en) * | 2012-10-30 | 2013-02-13 | 宁波开灵气动元件制造有限公司 | Ultrahigh-temperature solenoid valve |
| CN104930244B (en) * | 2014-03-21 | 2018-12-04 | 赛峰航空助推器股份有限公司 | Aviation electronics valve for high pressure low temperature gas |
| CN104930244A (en) * | 2014-03-21 | 2015-09-23 | 航空技术空间股份有限公司 | Aerospace solenoid valve for high-pressure cryogenic gas |
| CN105020457A (en) * | 2015-06-29 | 2015-11-04 | 奉化市星宇电子有限公司 | Stepwise direct-action piston type high-pressure-difference electromagnetic valve |
| CN105020457B (en) * | 2015-06-29 | 2017-06-06 | 奉化市星宇电子有限公司 | A kind of substep direct acting piston type high pressure difference magnetic valve |
| CN105333205A (en) * | 2015-11-23 | 2016-02-17 | 浙江理工大学 | High-pressure pilot-operated solenoid valve for compressed natural gas automobile |
| CN105673867A (en) * | 2016-04-13 | 2016-06-15 | 湖南凯恩利液压机械制造有限公司 | Electromagnetic valve for water and mechanical device |
| CN105822809A (en) * | 2016-05-26 | 2016-08-03 | 上海舜华新能源系统有限公司 | Electromagnetic actuator mounted on high-pressure gas integrated cylinder valve |
| CN107956911B (en) * | 2016-10-14 | 2019-10-15 | 杭州三花研究院有限公司 | A kind of solenoid valve |
| CN107956911A (en) * | 2016-10-14 | 2018-04-24 | 杭州三花研究院有限公司 | A kind of solenoid valve |
| CN108343773A (en) * | 2017-01-25 | 2018-07-31 | 现代自动车株式会社 | Include the solenoid valve of the movable independently guide's stopper head of energy |
| CN108343773B (en) * | 2017-01-25 | 2020-12-18 | 现代自动车株式会社 | Solenoid valve comprising independently movable pilot plunger head |
| CN107701763A (en) * | 2017-11-10 | 2018-02-16 | 宁波文泽机电技术开发有限公司 | The ratio one-way flow valves of performance improvement |
| CN107701763B (en) * | 2017-11-10 | 2019-03-19 | 北京德华力通液压件制造有限公司 | The ratio one-way flow valves of performance improvement |
| CN110159771B (en) * | 2018-02-13 | 2024-02-27 | 艾欧史密斯(中国)热水器有限公司 | Combined control mechanism |
| CN110159771A (en) * | 2018-02-13 | 2019-08-23 | 艾欧史密斯(中国)热水器有限公司 | Combine control mechanism |
| CN111692407A (en) * | 2020-06-28 | 2020-09-22 | 中车成都机车车辆有限公司 | Self-sealing gas high-pressure valve |
| CN111692407B (en) * | 2020-06-28 | 2022-04-01 | 中车成都机车车辆有限公司 | Self-sealing gas high-pressure valve |
| CN112483654A (en) * | 2020-10-27 | 2021-03-12 | 北京宇航系统工程研究所 | Quick response solenoid valve |
| CN114458769A (en) * | 2020-11-09 | 2022-05-10 | 英嘉动力科技无锡有限公司 | Quick response's guide's formula solenoid valve structure |
| WO2023179349A1 (en) * | 2022-03-25 | 2023-09-28 | 浙江盾安人工环境股份有限公司 | Pilot-operated solenoid valve |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120926 |
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| CX01 | Expiry of patent term |