CN204900928U - Pneumatic type solenoid valve - Google Patents
Pneumatic type solenoid valve Download PDFInfo
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- CN204900928U CN204900928U CN201520465843.9U CN201520465843U CN204900928U CN 204900928 U CN204900928 U CN 204900928U CN 201520465843 U CN201520465843 U CN 201520465843U CN 204900928 U CN204900928 U CN 204900928U
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- face
- chamber
- valve rod
- ante
- back cavity
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Abstract
The utility model discloses a pneumatic type solenoid valve, including valve body, valve rod, preceding closing cap and back closing cap, preceding closing cap with the preceding tip of valve rod is formed with the ante -chamber, back closing cap with the back tip of valve rod is formed with back cavity, its characterized in that: the ante -chamber with the back cavity is kept apart with external, the inside cavity of valve rod is formed with the cavity passageway, this cavity passageway with ante -chamber and back cavity communicate with each other, or, the ante -chamber with the back cavity communicates with each other rather than adjacent gas source channel or working chamber respectively. At valve rod back -and -forth movement in -process, the interior air of ante -chamber and back cavity can pass through cavity passageway reciprocal interchange, has prevented the damage of external contamination thing to the solenoid valve, has improved the life of solenoid valve, because ante -chamber and back cavity and external the isolation to the tip seals up the requirement with back tip and valve body complex before having reduced the valve rod, has saved the setting of preceding tip with the back tip upper seal circle of valve rod, has reduced the manufacturing cost of solenoid valve.
Description
Technical field
The utility model relates to a kind of solenoid valve, particularly a kind of pneumatic type solenoid valve.
Background technique
Existing pneumatic type solenoid valve, as shown in Figure 1, 2, comprises valve body 1 ', valve rod 2 ' and capping, utilizes electromagnetic force to promote valve rod 1 ' slide anteroposterior in valve body 2 ', realizes commutation.Wherein, capping comprises front capping 3 ' and rear seal-cover 4 ', front head part 31 ' is provided with in front capping 3 ', front head part 31 ' is provided with leather cup, for sealing with front capping 3 ', the front-end face of valve rod 2 ' and this front head part 31 ' offset, and front capping 3 ' is formed with ante-chamber 33 ' with the front end 21 ' of valve rod 2 '; In rear seal-cover 4 ', be provided with rear head part 41 ', rear head part 41 ' is provided with leather cup, for sealing with rear seal-cover 4 ', the ear end face of valve rod 2 ' and this rear head part 41 ' offset, and rear seal-cover 4 ' becomes to have back cavity 43 ' with the rearward end shape 22 ' of valve rod 2 '.
Move past after valve rod 2 ' in journey, ante-chamber 33 ' space compression, make the air in ante-chamber 33 ' need to be discharged, back cavity 43 ' space becomes large, makes to need to supplement air in back cavity 43 ', as shown in Figure 1; In valve rod 2 ' reach process, back cavity 43 ' space compression, make the air in back cavity 43 ' need to be discharged, ante-chamber 33 ' space becomes large, and making needs to supplement air in ante-chamber 33 ', as shown in Figure 2.In order to realize discharge and the absorption of air in ante-chamber 33 ' and back cavity 43 ', in prior art, adopt in front capping 3 ' with on the end face of rear seal-cover 4 ', distribution arranges open front 32 ' and after-opening 42 ', and ante-chamber 33 ' and back cavity 43 ' are communicated with external environment condition respectively.But, due to pneumatic type solenoid valve in the course of the work, ante-chamber 33 ' and back cavity 43 ' communicate with external environment condition all the time, along with the growth of service time, the pollutants such as the impurity in external environment condition, moisture easily enter in ante-chamber 33 ' and back cavity 43 ', cause valve rod 2 ' premature abrasion, have impact on coordinating between valve rod 2 ' with valve body 1 ', reduce the working life of pneumatic type solenoid valve.
In the prior art, in order to overcome above-mentioned defect, usually on the front end 21 ' and rearward end 22 ' of valve rod 2 ' except friction ring is set, also need to arrange seal ring, to prevent from entering the pollutant in ante-chamber 33 ' or back cavity 43 ', enter further in active chamber that valve rod 2 ' and valve body 1 ' formed.But expensive due to the seal ring on solenoid valve, result in the raising of the manufacture cost of pneumatic type solenoid valve.
Model utility content
The technical problems to be solved in the utility model is the present situation for prior art, provides a kind of practicality rational in infrastructure, prevents by extraneous dirt contamination, the pneumatic type solenoid valve that increases the service life.
The utility model solves the problems of the technologies described above adopted technological scheme: a kind of pneumatic type solenoid valve, comprise valve body, be located at the valve rod in this valve body, be located at the front closure assemblies of this valve body front end and be located at the rear seal-cover assembly of this valve rear end, described front closure assemblies includes front capping, described rear seal-cover assembly includes rear seal-cover, the front-end face of described front closure assemblies and described valve rod offsets, the front end of described front capping and described valve rod is formed with ante-chamber, the ear end face of described rear seal-cover assembly and described valve rod offsets, the rearward end of described rear seal-cover and described valve rod is formed with back cavity, it is characterized in that: described ante-chamber and described back cavity are isolated from the outside, described stem internal hollow, be formed with hollow channel, this hollow channel communicates with described ante-chamber and back cavity, or the source of the gas passage that described ante-chamber and described back cavity are adjacent respectively or active chamber communicate.
As improvement, the end face of described rear seal-cover is provided with pilot hole, be provided with end-face seal ring between the end face of described rear seal-cover and valve body, the form that arranges of described end-face seal ring is: for sealing the end-face seal ring of described pilot hole and being split type for sealing the end-face seal ring of described back cavity; Or, for sealing the end-face seal ring of described pilot hole and being integral type for sealing the end-face seal ring of described back cavity.Wherein, Integral end face seal circle, relative to split type end-face seal ring, reduces manufacture cost, is convenient to the installation of end-face seal ring, meanwhile, is conducive to improving sealing effect.
Improve, the mode that described hollow channel communicates with described ante-chamber has three kinds again:
First kind of way, the front-end face of described valve rod is provided with the open front that ante-chamber is communicated with hollow channel;
The second way, the front end of described valve rod is provided with the prepass that ante-chamber is communicated with hollow channel;
The third mode, is provided with front head part in described front capping, blind hole before having on the end face of described front head part, and be formed with radial front catch along on the inwall of this front blind hole, the front-end face of described valve rod and this front catch offset;
Further, the end face that described front head part and described valve rod front-end face offset has the front groove milling of radial distribution, this front groove milling is communicated with ante-chamber and hollow channel;
Further, projection before the bottom center of described front blind hole is provided with, this front projection does not contact with the front-end face of described valve rod, to improve the intensity of front head part.
The mode that described hollow channel communicates with described back cavity has three kinds:
First kind of way, the ear end face of described valve rod is provided with the after-opening that back cavity is communicated with hollow channel;
The second way, the rearward end of described valve rod is provided with the rear passage that back cavity is communicated with hollow channel;
The third mode, is provided with rear head part in described rear seal-cover, and the end face of head part in the rear has rear blind hole, and be formed with radial rear catch along on the inwall of this rear blind hole, the ear end face of described valve rod and this rear catch offset;
Further, the end face that described rear head part and described valve rod rear end face offset has the rear groove milling of radial distribution, this rear groove milling is communicated with back cavity and hollow channel;
Further, the bottom center of blind hole is provided with rear projection in the rear, and this rear projection does not contact with the ear end face of described valve rod, to improve the intensity of rear head part.
Improve again, the front end of described valve rod and between rearward end and valve body each be provided with a friction ring, described friction ring is for separating active chamber the contacting respectively and between ante-chamber and back cavity of valve body.Compare existing, in order to separate active chamber the contacting respectively and between ante-chamber and back cavity of valve body, the front end of valve rod and between rearward end and valve body except friction ring is set, also need respectively to be provided with one or more seal ring, enter in ante-chamber or back cavity to prevent pollutant, the utility model eliminates the setting of seal ring in valve rod front end and rearward end, reduces the manufacture cost of solenoid valve.
Or, the source of the gas passage adjacent with described ante-chamber is front source of the gas passage, the source of the gas passage adjacent with described back cavity is rear source of the gas passage, the front-end face of described valve body offers the first passage that described ante-chamber is communicated with described front source of the gas passage, the ear end face of described valve body offers the second channel that described back cavity is communicated with described rear source of the gas passage.
Can also be, the active chamber adjacent with described ante-chamber is front active chamber, the active chamber adjacent with described back cavity is rear active chamber, the front-end face of described valve body offers the third channel that described ante-chamber is communicated with described front active chamber, the ear end face of described valve body offers the four-way that described back cavity is communicated with described rear active chamber.
Compared with prior art, owing to the utility model has the advantage of: by forming hollow channel at stem internal, simultaneously, ante-chamber and back cavity are isolated from the outside, ensure that the air total amount in ante-chamber and back cavity is certain, move forward and backward in process at valve rod, the air in ante-chamber and back cavity, can be exchanged mutually by hollow channel; Or the source of the gas passage that ante-chamber and back cavity are adjacent respectively or active chamber communicate, make, meeting while valve rod moves forward and backward requirement, to prevent from external contaminants to the damage of solenoid valve, improve the working life of solenoid valve; Meanwhile, because ante-chamber and back cavity are isolated from the outside, thus reduce the seal request that valve rod front end and rearward end coordinate with valve body, the setting of seal ring in valve rod front end and rearward end can be eliminated, achieve the reduction of manufacture cost.
Accompanying drawing explanation
Fig. 1 is the structural representation of valve rod reach in existing pneumatic type solenoid valve;
Fig. 2 is the structural representation moved after valve rod in existing pneumatic type solenoid valve;
Fig. 3 is the structural representation of valve rod in Fig. 1;
Fig. 4 is the structural representation of valve rod reach in the utility model pneumatic type solenoid valve;
Fig. 5 is the structural representation moved after valve rod in the utility model pneumatic type solenoid valve;
Fig. 6 is the structural representation of valve rod in Fig. 4;
Fig. 7 is the structural representation of rear head part in Fig. 4;
Fig. 8 is the structural representation of rear seal-cover in Fig. 4;
Fig. 9 is structural representation rear seal-cover being installed split type end-face seal ring;
Figure 10 is structural representation rear seal-cover being installed Integral end face seal circle;
Figure 11 is the structural representation of Integral end face seal circle;
Figure 12 is the structural representation in another embodiment of the present utility model;
Figure 13 is the structural representation of front head part in Fig. 4;
Figure 14 be in Figure 13 A to schematic diagram.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the utility model.
As shown in Fig. 1 to 14, the pneumatic type solenoid valve in this enforcement, comprises valve body 1, valve rod 2, front closure assemblies, rear seal-cover assembly, friction ring, front head part 31, rear head part 41 and electromagnetic pilot body 5 etc.Wherein, valve rod 2 is located in this valve body 1, and front closure assemblies includes front capping 3, and rear seal-cover assembly includes rear seal-cover 4, and capping 3 before this valve body 1 front end is arranged arranges rear seal-cover 4 in this valve body 1 rear end, is connected with electromagnetic pilot body 5 in the rear end of rear seal-cover 4.
Wherein, the front-end face of front closure assemblies and valve rod 2 offsets, front capping 3 is formed with ante-chamber 33 with the front end 21 of valve rod 2, the ear end face of rear seal-cover assembly and valve rod 2 offsets, rear seal-cover 4 is formed with back cavity 43 with the rearward end 22 of valve rod 2, ante-chamber 33 and back cavity 43 are isolated from the outside, the mode selected is, the end face of front capping 3 and rear seal-cover 4 is respectively equipped with end-face seal ring, be specially, front capping 3 arranges front-end face seal ring 32, rear seal-cover 4 is arranged ear end face seal ring 42, thus by ante-chamber 33 and back cavity 43 isolated with external environment condition, valve rod 2 inner hollow, be formed with hollow channel 23, this hollow channel 23 communicates with ante-chamber 33 and back cavity 43.
In addition, the end face of rear seal-cover 4 is provided with pilot hole 44, the end-face seal ring be provided with between the end face of rear seal-cover 4 and valve body 2 can be Integral end face seal circle 46, namely for the end-face seal ring that seals pilot hole 44 be integral type for sealing the end-face seal ring of back cavity 43, as shown in Figure 10; Also can be split type end-face seal ring 45, namely for sealing the end-face seal ring of pilot hole 44 and being split type for sealing the end-face seal ring of back cavity 43, as shown in Figure 9.Wherein, Integral end face seal circle 46, relative to split type end-face seal ring 45, reduces manufacture cost, is convenient to the installation of end-face seal ring, meanwhile, is conducive to improving sealing effect.
In addition, the mode that hollow channel 23 communicates with ante-chamber 33 can select the following arbitrary middle mode having three kinds of modes:
First kind of way, the front-end face of valve rod 2 is provided with the open front that ante-chamber 33 is communicated with hollow channel 23;
The second way, the front end 21 of valve rod 2 is provided with the prepass 24 that ante-chamber 33 is communicated with hollow channel 23;
The third mode, is provided with front head part 31 in front capping 3, blind hole before having on the end face of front head part 31, and be formed with radial front catch along on the inwall of this front blind hole, the front-end face of valve rod 2 and this front catch offset; With rear seal-cover 4 similar.
Further, in order to increase ante-chamber 33 gas fluidity, the end face that front head part 31 and valve rod 2 front-end face offset has the front groove milling 311 of radial distribution, this front groove milling 311 is communicated with ante-chamber 33 and hollow channel 23, the quantity of this front groove milling 311 is on 3 to 10 end faces being distributed in front head part, as shown in Figure 13,14, before in the present embodiment, head part 31 have employed 3 to 10 uniform front groove millings 311;
Further, projection before the bottom center of front blind hole is provided with, this front projection does not contact with the front-end face of valve rod 2, by arranging front projection, to improve the intensity of front head part 31.
In addition, the mode that hollow channel 23 communicates with back cavity 43 can select the following arbitrary middle mode having three kinds of modes:
First kind of way, the ear end face of valve rod 2 is provided with the after-opening that back cavity 43 is communicated with hollow channel 23;
The second way, the rearward end 22 of valve rod 2 is provided with the rear passage 25 that back cavity 43 is communicated with hollow channel 23;
The third mode, is provided with rear head part 41 in rear seal-cover 4, blind hole 411 after having on the end face of rear head part 41, and be formed with radial rear catch 412 along on the inwall of this rear blind hole 411, the ear end face of valve rod 2 and this rear catch 412 offset;
Further, in order to increase back cavity 43 gas fluidity, the end face that rear head part 41 and valve rod 2 ear end face offset has the rear groove milling of radial distribution, this rear groove milling is communicated with back cavity 43 and hollow channel 23, and the quantity of this rear groove milling is on 3 to 10 end faces being distributed in front head part;
Further, projection 412 after the bottom center of rear blind hole 411 is provided with, this rear projection 412 does not contact with the ear end face of valve rod 2, by arranging rear projection 412, to improve the intensity of rear head part.
Finally, the front end 21 of valve rod 2 and between rearward end 22 and valve body 1 each be provided with a friction ring, be specially, between the front end 21 and valve body 1 of valve rod 2, be provided with a front friction ring 61; Friction ring 62 be provided with one between the rearward end 22 and valve body 1 of valve rod 2 after, the setting of front friction ring 61 and rear friction ring 62, is convenient to the movement of valve rod 2 in valve body 1, prevents the excessive wear of valve rod 2.Compare the structure of existing pneumatic type solenoid valve, because ante-chamber 33 and back cavity 43 communicate with external environment condition, in order to prevent from external contaminants from entering in the active chamber of valve body 1, also need to arrange one or more seal ring on the front end 21 and rearward end 22 of valve rod 2.The utility model is isolated from the outside due to ante-chamber 33 and back cavity 43, thus reduce the front end 21 of valve rod 2, seal request that rearward end 22 coordinates with valve body 1, the setting of seal ring in the front end 21 of valve rod 2 and rearward end 22 can be eliminated, reduce the manufacture cost of solenoid valve.
The working principle of the utility model embodiment is:
In the process that valve rod 2 moves forward, the reduced space of back cavity 43, the space of ante-chamber 33 becomes large, and the air in back cavity 43 flow to ante-chamber 33 by hollow channel 23; In the process of moving after valve rod 2, the reduced space of ante-chamber 33, the space of back cavity 43 becomes large, and the air in ante-chamber 33 by hollow channel stream 23 to back cavity 43, thus realizes ante-chamber 33 and back cavity 43 presses equilibrium of forces.
As shown in figure 12, another embodiment of the present utility model is, while ante-chamber 33 and back cavity 43 are isolated from the outside, eliminates the setting of hollow channel 23 in valve rod 2, but the source of the gas passage making ante-chamber 33 and back cavity 43 be adjacent respectively or active chamber communicate.
Concrete first kind of way is: the source of the gas passage adjacent with ante-chamber 33 is front source of the gas passage 12, the source of the gas passage adjacent with back cavity 43 is rear source of the gas passage 13, the front-end face of valve body 1 offers the first passage 121 that ante-chamber 33 is communicated with front source of the gas passage 12, the ear end face of valve body 1 offers the second channel 131 that back cavity 43 is communicated with rear source of the gas passage 13.
The concrete second way is: the active chamber adjacent with ante-chamber 33 is front active chamber 11, the active chamber adjacent with back cavity 43 is rear active chamber 14, the front-end face of valve body 1 offers the third channel 111 that ante-chamber 33 is communicated with front active chamber 11, the ear end face of valve body 1 offers the four-way 141 that back cavity 43 is communicated with rear active chamber 14.
The utility model is by forming hollow channel 23 in valve rod 2 inside, simultaneously, ante-chamber 33 and back cavity 43 are isolated from the outside, ensure that the air total amount in ante-chamber 33 and back cavity 43 is certain, move forward and backward in process at valve rod 2, air in ante-chamber 33 and back cavity 43, can be exchanged mutually by hollow channel 23; Or the source of the gas passage that ante-chamber 33 and back cavity 43 are adjacent respectively or active chamber communicate, make, while meeting the movable requirement of valve rod 2, to prevent from external contaminants to the damage of solenoid valve, improve the working life of solenoid valve; Meanwhile, because ante-chamber 33 and back cavity 43 are isolated from the outside, thus reduce the seal request that valve rod 2 front end 21 and rearward end 22 coordinate with valve body 1, eliminate the setting of seal ring in the front end 21 of valve rod 2 and rearward end 22, achieve the reduction of manufacture cost.
Claims (10)
1. a pneumatic type solenoid valve, comprise valve body, be located at the valve rod in this valve body, be located at the front closure assemblies of this valve body front end and be located at the rear seal-cover assembly of this valve rear end, described front closure assemblies includes front capping, described rear seal-cover assembly includes rear seal-cover, the front-end face of described front closure assemblies and described valve rod offsets, the front end of described front capping and described valve rod is formed with ante-chamber, the ear end face of described rear seal-cover assembly and described valve rod offsets, the rearward end of described rear seal-cover and described valve rod is formed with back cavity, it is characterized in that: described ante-chamber and described back cavity are isolated from the outside, described stem internal hollow, be formed with hollow channel, this hollow channel communicates with described ante-chamber and back cavity, or the source of the gas passage that described ante-chamber and described back cavity are adjacent respectively or active chamber communicate.
2. pneumatic type solenoid valve according to claim 1, it is characterized in that: the end face of described rear seal-cover is provided with pilot hole, be provided with end-face seal ring between the end face of described rear seal-cover and valve body, the form that arranges of described end-face seal ring is: for sealing the end-face seal ring of described pilot hole and being split type for sealing the end-face seal ring of described back cavity; Or, for sealing the end-face seal ring of described pilot hole and being integral type for sealing the end-face seal ring of described back cavity.
3. pneumatic type solenoid valve according to claim 1 and 2, is characterized in that: the mode that described hollow channel communicates with described ante-chamber is: on the front-end face of described valve rod, be provided with the open front that ante-chamber is communicated with hollow channel; Or, the front end of described valve rod is provided with the prepass that ante-chamber is communicated with hollow channel.
4. pneumatic type solenoid valve according to claim 1 and 2, is characterized in that: the mode that described hollow channel communicates with described back cavity is: on the ear end face of described valve rod, be provided with the after-opening that back cavity is communicated with hollow channel; Or, the rearward end of described valve rod is provided with the rear passage that back cavity is communicated with hollow channel.
5. pneumatic type solenoid valve according to claim 1 and 2, it is characterized in that: in described front capping, be provided with front head part, blind hole before having on described front head part end face, be formed with radial front catch along on the inwall of this front blind hole, the front-end face of described valve rod and this front catch offset; Be provided with rear head part in described rear seal-cover, the end face of head part in the rear has rear blind hole, be formed with radial rear catch along on the inwall of this rear blind hole, the ear end face of described valve rod and this rear catch offset.
6. pneumatic type solenoid valve according to claim 5, is characterized in that: projection before the bottom center of described front blind hole is provided with, and this front projection does not contact with the front-end face of described valve rod; The bottom center of blind hole is provided with rear projection in the rear, and this rear projection does not contact with the ear end face of described valve rod.
7. pneumatic type solenoid valve according to claim 1 and 2, it is characterized in that: the front end of described valve rod and between rearward end and valve body each be provided with a friction ring, described friction ring is for separating active chamber the contacting respectively and between ante-chamber and back cavity of valve body.
8. pneumatic type solenoid valve according to claim 1, it is characterized in that: the source of the gas passage adjacent with described ante-chamber is front source of the gas passage, the source of the gas passage adjacent with described back cavity is rear source of the gas passage, the front-end face of described valve body offers the first passage that described ante-chamber is communicated with described front source of the gas passage, the ear end face of described valve body offers the second channel that described back cavity is communicated with described rear source of the gas passage.
9. pneumatic type solenoid valve according to claim 1, it is characterized in that: the active chamber adjacent with described ante-chamber is front active chamber, the active chamber adjacent with described back cavity is rear active chamber, the front-end face of described valve body offers the third channel that described ante-chamber is communicated with described front active chamber, the ear end face of described valve body offers the four-way that described back cavity is communicated with described rear active chamber.
10. pneumatic type solenoid valve according to claim 5, is characterized in that: the front groove milling end face that described front head part and described valve rod front-end face offset having radial distribution, and this front groove milling is communicated with ante-chamber and hollow channel; The end face that described rear head part and described valve rod rear end face offset has the rear groove milling of radial distribution, this rear groove milling is communicated with back cavity and hollow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520465843.9U CN204900928U (en) | 2015-07-02 | 2015-07-02 | Pneumatic type solenoid valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520465843.9U CN204900928U (en) | 2015-07-02 | 2015-07-02 | Pneumatic type solenoid valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204900928U true CN204900928U (en) | 2015-12-23 |
Family
ID=54923104
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520465843.9U Withdrawn - After Issue CN204900928U (en) | 2015-07-02 | 2015-07-02 | Pneumatic type solenoid valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204900928U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390032A (en) * | 2014-11-21 | 2015-03-04 | 宁波飞泰工业自控设备有限公司 | Pneumatic type electromagnetic valve |
| WO2019134108A1 (en) * | 2018-01-05 | 2019-07-11 | Norgren Manufacturing Co., Ltd. | Improved spool valve |
| CN118728998A (en) * | 2024-08-30 | 2024-10-01 | 宁波索诺工业自控设备有限公司 | Flameproof two-position five-way solenoid reversing valve |
-
2015
- 2015-07-02 CN CN201520465843.9U patent/CN204900928U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104390032A (en) * | 2014-11-21 | 2015-03-04 | 宁波飞泰工业自控设备有限公司 | Pneumatic type electromagnetic valve |
| CN104390032B (en) * | 2014-11-21 | 2017-10-20 | 宁波飞泰工业自控设备有限公司 | A kind of pneumatic type magnetic valve |
| WO2019134108A1 (en) * | 2018-01-05 | 2019-07-11 | Norgren Manufacturing Co., Ltd. | Improved spool valve |
| CN118728998A (en) * | 2024-08-30 | 2024-10-01 | 宁波索诺工业自控设备有限公司 | Flameproof two-position five-way solenoid reversing valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20151223 Effective date of abandoning: 20171020 |
|
| AV01 | Patent right actively abandoned |