CN211145441U - External pilot-operated electromagnetic valve - Google Patents
External pilot-operated electromagnetic valve Download PDFInfo
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- CN211145441U CN211145441U CN201922388448.6U CN201922388448U CN211145441U CN 211145441 U CN211145441 U CN 211145441U CN 201922388448 U CN201922388448 U CN 201922388448U CN 211145441 U CN211145441 U CN 211145441U
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Abstract
The utility model relates to a solenoid valve technical field, concretely relates to external guide's formula solenoid valve. The external pilot-operated electromagnetic valve comprises a valve body, a valve cover, an electromagnetic head, a valve rod assembly and a movable iron core assembly; the valve rod assembly is positioned in a first movable cavity of the valve body, and the movable iron core assembly is positioned in a second movable cavity of the electromagnetic head; the valve cover is connected with the valve body and the electromagnetic head, and a third movable cavity communicated with the second movable cavity is formed between the valve rod assembly and the valve cover; the valve cover is provided with an air passage which is communicated with the second movable cavity and the outside or an air source and used for releasing or supplementing the medium pressure in the second movable cavity until the medium pressure in the second movable cavity and the medium pressure in the third movable cavity generate pressure difference with the medium pressure in the first movable cavity, so that the valve rod assembly reciprocates in the first movable cavity along the first direction, and the valve rod assembly can alternately control the flow ports to be alternately switched on and off.
Description
Technical Field
The utility model belongs to the technical field of the solenoid valve technique and specifically relates to an external guide's formula solenoid valve is related to.
Background
The pilot type electromagnetic valve realizes pressure relief of an upper cavity of the electromagnetic valve by arranging a pilot hole communicated with the upper cavity of the electromagnetic valve, so that low-high pressure difference is formed around a main valve core, and fluid pressure pushes the main valve core to move upwards to open a main valve port under the action of the pressure difference. However, the pilot hole can only realize the pressure relief function, so the auxiliary reversing function of the pilot hole needs to be improved.
SUMMERY OF THE UTILITY MODEL
The application aims to provide an external pilot-operated solenoid valve to solve the technical problem that the reversing function of the pilot-operated solenoid valve in the prior art needs to be improved to a certain extent.
The application provides an external pilot-operated electromagnetic valve which comprises a valve body, a valve cover, an electromagnetic head, a valve rod assembly and a movable iron core assembly;
a first movable cavity is formed in the valve body, and the valve rod assembly is positioned in the first movable cavity; a second movable cavity is formed in the electromagnetic head, and the movable iron core assembly is positioned in the second movable cavity; the valve cover is connected with the valve body and the electromagnetic head, and a third movable cavity communicated with the second movable cavity is formed between the valve rod assembly and the valve cover;
an air channel is formed on the valve cover, one end of the air channel can be communicated with the second movable cavity, and the other end of the air channel is communicated with the outside or an air source and is used for releasing or supplementing the medium pressure in the second movable cavity until the medium pressure in the second movable cavity and the third movable cavity and the medium pressure in the first movable cavity generate pressure difference, so that the valve rod assembly reciprocates in the first movable cavity along the first direction;
a plurality of flow passage ports are formed on the valve body, and the flow passage ports are communicated with the first movable cavity; in the process that the valve rod assembly reciprocates in the first direction in the first movable cavity, the valve rod assembly can alternatively block parts of the plurality of flow passage ports so as to alternatively open and close the plurality of flow passage ports.
In the above technical solution, preferably, an air source interface is arranged on the valve cover and is used for communicating the air source with the air passage.
In any one of the above technical solutions, preferably, the valve stem assembly includes a valve stem and a first force application member, and the first force application member applies a force to the valve stem to make the valve stem away from the bonnet.
In any of the above technical solutions, preferably, a first sealing member is disposed at one end of the valve rod, and the first sealing member is attached to an inner wall of the first movable cavity and used for separating the first movable cavity from the third movable cavity;
the valve rod is provided with a plurality of blocking parts which are arranged at intervals along the first direction and used for blocking the communication between the adjacent runner ports in the reciprocating motion process of the valve rod along the first direction.
In any of the above technical solutions, preferably, the number of the channel openings is three, and the three channel openings are arranged alternately along the first direction at intervals to form two medium channels; the number of the plugging parts on the valve rod is two; in the process that the valve rod reciprocates along the first direction, the blocking part alternately blocks the two medium flow passages.
In any one of the above technical solutions, preferably, the plunger assembly includes a piston rod and a second force application member, and the second force application member applies an acting force to the piston rod to make the piston rod approach the valve cover.
In any one of the above technical solutions, preferably, a second sealing member is disposed at a position, corresponding to the gas passage, of one end of the piston rod facing the valve cover, and the second sealing member is used for blocking communication between the gas passage and the second movable chamber.
In any of the above technical solutions, preferably, the valve cover is further provided with a manual device, and one end of the manual device is in a diameter-variable arrangement and is abutted to the movable iron core assembly; the manual device can rotate, and can push the movable iron core assembly to move in the second movable cavity in the rotating process, so that the gas channel is communicated with or disconnected from the second movable cavity.
In any of the above technical solutions, preferably, the joints of the valve cover and the valve body and the electromagnetic head are respectively provided with a sealing gasket.
In any of the above technical solutions, preferably, the valve body, the valve cover, and the electromagnetic head are all made of radiation-resistant polymer materials.
Compared with the prior art, the beneficial effects of the utility model are that:
the external pilot-operated electromagnetic valve comprises a valve body, a valve cover, an electromagnetic head, a valve rod assembly and a movable iron core assembly; the valve rod assembly is positioned in a first movable cavity of the valve body, and the movable iron core assembly is positioned in a second movable cavity of the electromagnetic head; the valve cover is connected with the valve body and the electromagnetic head, and a third movable cavity communicated with the second movable cavity is formed between the valve rod assembly and the valve cover; the valve cover is provided with an air passage which is communicated with the second movable cavity and the outside or an air source and used for releasing or supplementing the medium pressure in the second movable cavity until the medium pressure in the second movable cavity and the third movable cavity and the medium pressure in the first movable cavity generate a thrust difference on the valve rod assembly, so that the valve rod assembly reciprocates in the first movable cavity along the first direction, and the valve rod assembly can alternately control the flow channel ports to be alternately switched on and off. This application is through setting up external pilot hole on the valve gap, can realize the release and the pressurization to the cavity in the valve body, better realization to the supplementary switching-over function of solenoid valve.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic view of an internal structure of an external pilot-operated solenoid valve according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating the external pilot-operated solenoid valve provided by the embodiment of the present invention as a two-position three-way valve.
Reference numerals:
1-a valve body, 11-a first movable cavity, 12-a valve rod, 13-a first force application member, 14-a first sealing member, 15-a blocking part, 16-a flow port A, 17-a flow port P and 18-a flow port O;
2-a valve cover, 21-a third movable cavity, 22-a gas channel, 23-a gas source interface, 24-a manual device and 25-a sealing ring;
3-the electromagnetic head, 31-the second movable cavity, 32-the piston rod, 33-the second force application member.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.
The components of the embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An externally piloted solenoid valve according to some embodiments of the present invention is described below with reference to fig. 1 and 2.
Referring to fig. 1, an embodiment of the present application provides an external pilot-operated solenoid valve, which includes a valve body 1, a valve cover 2, an electromagnetic head 3, a valve rod assembly, and a movable iron core assembly.
A first movable cavity 11 is formed in the valve body 1, and the valve rod assembly is positioned in the first movable cavity 11; the second activity chamber 31 is formed in the electromagnetism head 3, moves the iron core subassembly and is located the second activity chamber 31, and when the coil pack in the electromagnetism head 3 switched on, the coil pack can drive and move the iron core subassembly to the direction motion of keeping away from first activity chamber 11, and when the coil pack in the electromagnetism head 3 cut off the power supply, moves the iron core subassembly and moves to the direction that is close to first activity chamber 11 under the action of gravity, moves the iron core subassembly promptly and can be reciprocating motion along first direction in the second activity chamber 31.
The valve cover 2 is located between the valve body 1 and the electromagnetic head 3, the valve cover 2 is connected with the valve body 1 and the electromagnetic head 3 through a hexagon socket head cap screw and a nut, and a third movable cavity 21 communicated with the second movable cavity 31 is formed between the valve rod assembly and the valve cover 2. The valve cover 2 is formed with an air passage 22, one end of the air passage 22 can be communicated with the second movable cavity 31, and the other end is communicated with the outside or an air source, so as to release or supplement the medium pressure in the second movable cavity 31 until the medium pressure in the second movable cavity 31 and the third movable cavity 21 and the medium pressure in the first movable cavity 11 generate a pressure difference, so that the valve rod assembly reciprocates in the first movable cavity 11 along the first direction.
Specifically, when one end of the gas passage 22 is communicated with the second movable cavity 31 and the other end is communicated with the outside, the gas passage 22 can discharge the pressure in the second movable cavity 31, that is, the pressure relief effect on the second movable cavity 31 is achieved, so that the pressures in the second movable cavity 31 and the third movable cavity 21 are reduced until the medium pressures in the second movable cavity 31 and the third movable cavity 21 are smaller than the medium pressure in the first movable cavity 11, the pressure difference can drive the valve rod assembly to move towards the third movable cavity 21, and the change of the communication condition between the flow passage ports on the valve body 1 can be changed by the movement of the valve rod assembly. Similarly, when one end of the gas channel 22 is communicated with the second movable cavity 31 and the other end is communicated with the gas source, the gas source can be used for filling gas into the second movable cavity 31, so that the pressure in the second movable cavity 31 and the third movable cavity 21 is increased until the medium thrust generated by the medium pressure in the second movable cavity 31 and the third movable cavity 21 to the valve rod assembly is greater than the medium thrust generated by the medium pressure in the first movable cavity 11 to the valve rod assembly, and the thrust difference can drive the valve rod assembly to move towards the direction far away from the third movable cavity 21, so that the change of the communication condition between the runner ports on the valve body 1 is changed again through the movement of the valve rod assembly. Therefore, the external pilot-operated solenoid valve of the present application realizes the pressure relief and pressurization of the cavity in the valve body 1 through the external pilot hole, i.e., the gas channel 22, which is arranged on the valve cover 2, and better realizes the auxiliary reversing function of the solenoid valve.
In addition, in order to facilitate the connection of the gas channel 22 to a gas source, etc., referring to fig. 1, in the embodiment of the present application, a gas source interface 23 is further provided on the valve cap 2, and the gas source interface 23 is used for connecting a gas source or an adaptor. It should be noted that the present application can be used to communicate between the outside and the gas source through the adaptor, so as to better control the communication between the gas channel 22 and the gas source or the outside.
For the condition of communicating the flow channels on the valve body 1, a plurality of flow channel ports are arranged on the valve body 1 of the external pilot electromagnetic valve in the embodiment of the application, and the flow channel ports are communicated with the first movable cavity 11 and used for medium flowing; during the reciprocating motion of the valve rod assembly in the first direction in the first movable cavity 11, the valve rod assembly can alternatively block parts of the plurality of flow passage ports, so that the plurality of flow passage ports are alternatively switched on and off. The process of controlling the alternate opening and closing of the plurality of flow ports by the pressure relief and pressurization of the gas passage 22 to the interior of the valve body 1 will be described in detail below.
Referring to fig. 1, the valve stem assembly includes a valve stem 12 and a first force application member 13 disposed at one end of the valve stem 12, and the first force application member 13 always applies an acting force to the valve stem 12 to keep the valve stem away from the bonnet 2, so that the force of the first force application member 13 needs to be overcome when the valve stem 12 moves to the third movable cavity 21, and stability of a medium flow passage in the first movable cavity 11 is ensured. And the valve rod 12 is provided with a plugging part 15 corresponding to each flow passage opening, when the valve rod 12 moves to different positions, the plugging part 15 can plug or open the corresponding flow passage opening, thereby changing the on-off of a plurality of flow passage openings. Preferably, the first force application member 13 is a spring, the spring is located at one end of the valve rod 12 far away from the valve cap 2, one end of the spring is connected with the end cover of the valve body 1, and the other end of the spring is connected with the valve rod 12. In addition, in order to ensure the separation of the first movable cavity 11 and the third movable cavity 21 and the stable operation of the solenoid valve, a first sealing element 14 is arranged at one end of the valve rod 12 close to the valve cover 2, and the first sealing element 14 is attached to the inner wall of the second movable cavity 31 and used for separating the second movable cavity 31 from the third movable cavity 21.
As for the flow passage ports on the valve body 1, specifically, referring to fig. 1, three flow passage ports may be arranged on the valve body 1, and the three flow passage ports are arranged alternately along a first direction (i.e., the length direction of the valve rod 12) and form two medium flow passages, i.e., form a two-position three-way electromagnetic valve; the number of the stopper portions 15 on the valve stem 12 is two. When the valve works, the coil assembly is electrified to drive the movable iron core assembly to move upwards, so that the gas channel 22 is communicated with the second movable cavity 31, the other end of the gas channel 22 is communicated with the outside, pressure relief of the second movable cavity 31 can be realized, a low-high pressure difference is formed at the position of the valve rod assembly, and under the action of the pressure difference, when the fluid in the first movable cavity 11 pushes the valve rod 12 to move upwards to a first position, one medium flow channel is opened, the other medium flow channel is closed, and the opened medium flow channel is generally a main valve port. When the coil assembly is electrified to drive the movable iron core assembly to move upwards, the gas channel 22 is communicated with the second movable cavity 31, and at the moment, when the other end of the gas channel 22 is communicated with a gas source, the gas filled in the second movable cavity 31 can supplement the pressure of the second movable cavity 31, a low-to-high pressure difference is formed at the position of the valve rod assembly, and under the action of the pressure difference, when the gas in the second movable cavity 31 pushes the valve rod 12 to move downwards to the second position, the main valve port is closed at the moment, and the other medium flow passage is opened, so that the process of controlling the alternate connection and disconnection of a plurality of flow port ports by pressure relief and pressure filling of the gas channel 22 to the cavity in the valve body 1 is realized.
For example, as shown in fig. 1 and fig. 2, three flow port ports are provided on the valve body 1, which are respectively a flow port a16, a flow port P17 and a flow port O18, the flow port a16 and the flow port P17 form a first flow passage, the flow port a16 and the flow port O18 form a second flow passage, and the reciprocating change of the position of the valve rod 12 is controlled by the pressure relief and the pressure charging of the gas passage 22 to the inner cavity of the valve body 1, so that the communication conditions of the first flow passage and the second flow passage are controlled to be alternately changed.
In addition, the valve body 1 can also be provided with two flow passage ports, the two flow passage ports can be communicated through the first movable cavity 11 to form a medium flow passage, the corresponding valve rod 12 is provided with a group of blocking parts 15, and in the process that the valve rod 12 reciprocates along the first direction, when the valve rod 12 is at the first position, the blocking parts 15 block the two flow passage ports to block the medium flow passage; when the valve body 1 moves to the second position, the blocking portion 15 opens the two flow passage ports to communicate the medium flow passage. It should be noted that, the number and the communication condition of the runner openings can also be set according to specific requirements.
In addition, as for the structure of the plunger assembly, see fig. 1, it includes a piston rod 32 and a second force application member 33 located at one end of the piston rod 32, and the second force application member 33 applies a force to the piston rod 32 to make it approach the valve cover 2. And the one end of the piston rod 32 towards the valve cap 2 is provided with a second sealing element corresponding to the communication position of the gas channel 22 and the second movable cavity 31, when the coil assembly is powered off, the piston rod 32 moves towards the valve cap 2 to the joint of the second sealing element and the communication position of the gas channel 22 and the second movable cavity 31, the second sealing element can block the gas channel 22, and the change of medium pressure in the second movable cavity 31 is avoided. Preferably, a pipe assembly is arranged in the electromagnetic head 3, and a second movable cavity 31 is formed inside the pipe assembly; the second force applying member 33 is a conical spring, which is disposed at one end of the piston rod 32 close to the valve cap 2, and one end of the conical spring is connected to the pipe assembly, and the other end is connected to the piston rod 32.
In the embodiment of the application, referring to fig. 1, a manual device 24 is further disposed on the valve cover 2, one end of the manual device 24 is located in the valve cover 2 and can be abutted to the movable iron core assembly, and the other end faces the outside, so that the manual device is convenient for people to operate. Specifically, the manual device 24 can rotate, and one end of the manual device, which is abutted to the movable iron core assembly, is in a diameter-changing arrangement, so that the abutting position of the manual device 24 and the movable iron core assembly can be changed by rotating the manual device 24, and the diameter-changing structure of the manual device 24 can push the movable iron core assembly to move towards the direction far away from the valve cover 2, so that the gas channel 22 is communicated with the second movable cavity 31 to perform a pressure relief or pressure charging process; and with the rotation of the manual device 24, the movable iron core assembly can contact with the valve cover 2 under the action of gravity, and the communication part of the gas channel 22 and the second movable cavity 31 is blocked again. Therefore, the external pilot-operated solenoid valve of the embodiment of the application can realize the reversing of the solenoid valve through the manual device 24 when the power is off.
Furthermore, in order to increase the sealing performance of the solenoid valve as a whole, sealing gaskets are preferably arranged between the contact surfaces of the valve cover 2 and the valve body 1 and the electromagnetic head 3 respectively in the embodiment of the application. And a sealing ring 25 is arranged at the contact surface of the manual device 24 and the valve body 1 so as to ensure the sealing isolation of each movable cavity in the electromagnetic valve or the outside.
In addition, in order to improve the application scenario of the external pilot-operated solenoid valve of the present application and meet the environmental conditions of irradiation, earthquake, L OCA (L osof Coolant Accident), explosion prevention, etc., the valve body 1, the valve cover 2 and the electromagnetic head 3 of the external pilot-operated solenoid valve are made of materials which are high temperature resistant and radiation resistant and meet the conditions of irradiation, L OCA, etc., such as fluororubber, CF8, etc.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. An external pilot-operated electromagnetic valve is characterized by comprising a valve body, a valve cover, an electromagnetic head, a valve rod assembly and a movable iron core assembly;
a first movable cavity is formed in the valve body, and the valve rod assembly is positioned in the first movable cavity; a second movable cavity is formed in the electromagnetic head, and the movable iron core assembly is positioned in the second movable cavity; the valve cover is connected with the valve body and the electromagnetic head, and a third movable cavity communicated with the second movable cavity is formed between the valve rod assembly and the valve cover;
an air passage is formed on the valve cover, one end of the air passage can be communicated with the second movable cavity, and the other end of the air passage is communicated with the outside or an air source and is used for releasing or supplementing the medium pressure in the second movable cavity until the medium pressure in the second movable cavity and the third movable cavity and the medium pressure in the first movable cavity generate a thrust difference on the valve rod assembly, so that the valve rod assembly reciprocates in the first movable cavity along a first direction;
a plurality of flow passage ports are formed on the valve body, and the flow passage ports are communicated with the first movable cavity; in the process that the valve rod assembly reciprocates in the first direction in the first movable cavity, the valve rod assembly can alternatively block parts of the plurality of flow passage ports so as to alternatively open and close the plurality of flow passage ports.
2. The externally piloted solenoid valve of claim 1 wherein a gas source port is disposed on said valve cover for communicating said gas source with said gas passageway.
3. The externally piloted solenoid valve of claim 1 wherein the valve stem assembly comprises a valve stem and a first force applying member that applies a force to the valve stem away from the bonnet.
4. The externally piloted solenoid valve of claim 3 wherein a first seal is disposed at one end of said valve stem, said first seal engaging an inner wall of said first active chamber for separating said first active chamber from said third active chamber;
the valve rod is provided with a plurality of blocking parts which are arranged at intervals along the first direction and used for blocking the communication between the adjacent runner ports in the reciprocating motion process of the valve rod along the first direction.
5. The external pilot electromagnetic valve according to claim 4, wherein the number of the flow passage openings is three, and the three flow passage openings are alternately arranged along the first direction to form two medium flow passages; the number of the plugging parts on the valve rod is two; in the process that the valve rod reciprocates along the first direction, the blocking part alternately blocks the two medium flow passages.
6. The externally piloted solenoid valve of claim 5 wherein the plunger assembly comprises a piston rod and a second force applying member that applies a force to the piston rod to close the valve cap.
7. The externally piloted solenoid valve of claim 6 wherein a second seal is disposed at an end of said piston rod facing said valve cap corresponding to said gas passage for blocking communication between said gas passage and said second active chamber.
8. The external pilot electromagnetic valve according to claim 1, wherein a manual device is further disposed on the valve cover, and one end of the manual device is of a diameter-variable structure and is abutted to the movable iron core assembly; the manual device can rotate, and can push the movable iron core assembly to move in the second movable cavity in the rotating process, so that the gas channel is communicated with or disconnected from the second movable cavity.
9. The externally piloted solenoid valve of claim 1 wherein the connection of said valve cover to said valve body and said solenoid head is provided with a gasket, respectively.
10. The externally piloted solenoid valve of claim 1, wherein the valve body, the valve cover, and the solenoid head are made of radiation resistant material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922388448.6U CN211145441U (en) | 2019-12-26 | 2019-12-26 | External pilot-operated electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922388448.6U CN211145441U (en) | 2019-12-26 | 2019-12-26 | External pilot-operated electromagnetic valve |
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| Publication Number | Publication Date |
|---|---|
| CN211145441U true CN211145441U (en) | 2020-07-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922388448.6U Active CN211145441U (en) | 2019-12-26 | 2019-12-26 | External pilot-operated electromagnetic valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925457A (en) * | 2019-12-26 | 2020-03-27 | 鞍山电磁阀有限责任公司 | External pilot-operated electromagnetic valve |
| CN114838139A (en) * | 2022-06-02 | 2022-08-02 | 陕西星际荣耀空间科技有限责任公司 | Bistable passive self-holding pilot-operated electromagnetic valve |
-
2019
- 2019-12-26 CN CN201922388448.6U patent/CN211145441U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110925457A (en) * | 2019-12-26 | 2020-03-27 | 鞍山电磁阀有限责任公司 | External pilot-operated electromagnetic valve |
| CN114838139A (en) * | 2022-06-02 | 2022-08-02 | 陕西星际荣耀空间科技有限责任公司 | Bistable passive self-holding pilot-operated electromagnetic valve |
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