CN114215936A - Pneumatic Double Seal Control Valve - Google Patents
Pneumatic Double Seal Control Valve Download PDFInfo
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- CN114215936A CN114215936A CN202111307865.9A CN202111307865A CN114215936A CN 114215936 A CN114215936 A CN 114215936A CN 202111307865 A CN202111307865 A CN 202111307865A CN 114215936 A CN114215936 A CN 114215936A
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- valve
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- lower valve
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- spring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/20—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members
- F16K11/22—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by separate actuating members with an actuating member for each valve, e.g. interconnected to form multiple-way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02K—JET-PROPULSION PLANTS
- F02K9/00—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof
- F02K9/42—Rocket-engine plants, i.e. plants carrying both fuel and oxidant therefor; Control thereof using liquid or gaseous propellants
- F02K9/44—Feeding propellants
- F02K9/56—Control
- F02K9/58—Propellant feed valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention provides a pneumatic double-sealing control valve relating to the field of propellant control valves for liquid rocket engines, which comprises an air path pilot valve and a liquid path main valve, wherein the air path pilot valve is connected with the liquid path main valve through a pipeline and drives the liquid path main valve to open and close through the opening and closing of the air path pilot valve; the main valve of the liquid path comprises a corrugated pipe assembly, a lower valve assembly and an upper valve assembly, the corrugated pipe assembly, the lower valve assembly and the upper valve assembly are sequentially connected inside a shell of the main valve of the liquid path, the gas path pilot valve is isolated from the main valve of the liquid path through the corrugated pipe assembly, and the main valve of the liquid path realizes double sealing through the lower valve assembly and the upper valve assembly. The invention has reasonable structure, small volume and light weight, the gas path pilot valve adopts a two-position three-way electromagnetic valve, the liquid path main valve adopts a double-seal linkage structure of an upper valve component and a lower valve component, a redundant seal valve or an electric explosion valve is not designed before a system pipeline control valve is simplified, and the requirements of large flow, small flow resistance, light weight and reliable seal of a 1.5-ton engine control valve can be met.
Description
Technical Field
The invention relates to a propellant control valve for a liquid rocket engine, in particular to a high-flow pneumatic double-sealing propellant control valve.
Background
The large-flow pneumatic double-seal propellant control valve is an important component of a manned lunar exploration system and is a 1.5-ton engine control valve. The system requires that the rated water flow of the control valve reaches 2.53kg/s, and has small flow resistance, light weight and reliable sealing. In order to meet the index requirement of the system on the control valve of the 1.5-ton engine, a large-flow pneumatic type double-sealing propellant control valve is designed for supplying the propellant of the manned lunar exploration 1.5-ton engine, and the ignition and shutdown of the engine are realized.
The difference between the high-flow pneumatic double-sealing propellant control valve and the traditional solenoid valve is that the traditional solenoid valve can not reach the requirement of 2.53kg/s water flow and double sealing. The key technology is the gas and liquid path sealing isolation design, the double-sealing linkage structure design, the main valve response characteristic, the main valve moving part design and the like.
The patent document retrieval of the prior art finds that the Chinese utility model has the patent publication number of CN207161720U, discloses a reciprocating type air-tight control valve, belongs to the technical field of pneumatic control valves, and comprises a valve body and a valve core, wherein the valve body consists of two parts, one part is a control area, the other part is a valve working area, and the control area comprises a piston and a connecting rod; the valve working area consists of a valve core, a hollow air sealing ring, a valve core moving channel and two material flow channels which are opened or blocked after the valve core moves; the connecting rod drives the driving end of the valve core, and when the valve core is communicated with or blocks the two logistics channels after moving, the valve core and the inner wall of the valve core moving channel are sealed by the air sealing ring. The invention provides a high-flow pneumatic double-seal propellant control valve, which can not only simplify the design of a redundant seal valve or an electric explosion valve before a system pipeline control valve, but also meet the requirements of high flow, small flow resistance, light weight and reliable seal of a 1.5-ton engine control valve. Therefore, the method disclosed in the document and the invention belong to different inventive concepts.
Disclosure of Invention
In view of the shortcomings of the prior art, it is an object of the present invention to provide a pneumatic dual seal control valve.
The pneumatic double-seal control valve comprises an air path pilot valve and a liquid path main valve, wherein the air path pilot valve is connected with the liquid path main valve through a pipeline, and the liquid path main valve is driven to open and close through the opening and closing of the air path pilot valve, so that the circulation and the closure of a propellant of the liquid path main valve are realized;
the main valve of the liquid path comprises a corrugated pipe assembly, a lower valve assembly and an upper valve assembly, the corrugated pipe assembly, the lower valve assembly and the upper valve assembly are sequentially connected inside a shell of the main valve of the liquid path, the gas path pilot valve is isolated from the main valve of the liquid path through the corrugated pipe assembly, and the main valve of the liquid path realizes double sealing through the lower valve assembly and the upper valve assembly.
In some embodiments, the bellows assembly, the lower valve assembly, and the upper valve assembly are actuated in combination.
In some embodiments, the lower valve assembly comprises a lower valve seat, a lower valve core, a lower valve spring and a lower limiting block, the lower valve core is connected in the lower valve seat, the lower valve spring is uniformly distributed on two sides of a push rod of the lower valve assembly through the lower limiting block, and the lower valve core applies pretightening force through the lower valve spring;
the lower valve core provides driving force through the lower valve seat, overcomes the pressure of working media and the spring force generated by a lower valve spring, is separated from the lower valve seat, the lower valve assembly is opened, the lower valve core moves to the lower limiting block for limiting, and the working media flows;
and the lower valve core cancels the driving force through the lower valve seat, returns under the driving of the spring force of the lower valve spring and the pressure of the working medium, forms a sealing pair with the lower valve seat, closes the lower valve assembly and intercepts the working medium.
In some embodiments, the upper valve assembly comprises an upper valve spring, an upper valve core, an upper valve seat and an upper limiting block, the upper valve core is connected in the upper valve seat, one end of the upper valve spring is connected with the upper valve core, the other end of the upper valve spring is connected with the upper limiting block, the upper limiting block is fixed at the end part of the upper valve seat, and the upper valve core applies pretightening force through the upper valve spring;
when the lower valve component is opened, a push rod of the lower valve core drives the upper valve core, the upper valve core overcomes the pressure of working media and the spring force generated by an upper valve spring and drives the upper valve core to be separated from an upper valve seat, the upper valve component is opened, the upper valve core moves to an upper limiting block for limiting, and the working media flows;
or when the lower valve component is closed, the push rod of the lower valve core cancels the driving force, the upper valve core returns under the driving of the spring force generated by the upper valve spring and the pressure of the working medium, the upper valve seat and the upper valve core form a sealing pair, the upper valve component is closed, and the working medium is intercepted.
In some embodiments, the gas circuit pilot valve is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are respectively controlled to open and close by an electromagnetic valve.
In some embodiments, the main valve of the liquid path is provided with an inlet and an outlet, and the inlet and the outlet are respectively sealed by a spherical hard seal and a plunger O-shaped ring.
In some embodiments, the control valve controls the opening and closing of the air inlet, and the opening and closing of the air inlet drives the opening and closing of the inlet and the outlet;
when the gas circuit pilot valve is electrified, the control valve controls the gas inlet to be opened, the gas outlet to be closed, and the opening of the gas inlet drives the inlet and the outlet to be opened;
or when the gas circuit pilot valve is powered on, the control valve controls the gas inlet to be closed, the gas outlet to be opened, and the closing of the gas inlet drives the inlet and the outlet to be closed.
In some embodiments, when the gas circuit pilot valve is electrified and opened, the control gas builds pressure inside the bellows assembly to push the bellows assembly to act, the ejector rod of the bellows assembly jacks the lower valve core, the lower valve assembly is opened, the push rod of the lower valve core jacks the upper valve core, the upper valve assembly is opened, and the opening of the liquid main valve is realized;
or when the gas circuit pilot valve is closed in a power-off mode, the internal pressure of the corrugated pipe assembly is reduced, and the upper valve core and the lower valve core are closed under the combined action of the self resilience force of the corrugated pipe assembly and the spring force generated by the upper valve spring and the lower valve spring, so that the liquid main valve is closed.
In some embodiments, the inside of the bellows assembly is connected with weldless bellows on two sides respectively, and a plurality of weldless bellows are arranged in an array.
In some embodiments, the liquid main valve is made of a titanium alloy material.
Compared with the prior art, the invention has the following beneficial effects:
the invention has reasonable structure, small volume and light weight; the gas circuit pilot valve adopts a two-position three-way electromagnetic valve, and the liquid circuit main valve adopts a double-seal linkage structure of an upper valve component and a lower valve component, so that the requirements of large flow, small flow resistance, light weight and reliable sealing of a 1.5-ton engine control valve can be met.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic structural view of the lower valve assembly of the present invention;
FIG. 3 is a schematic structural view of the upper valve assembly of the present invention;
FIG. 4 is a schematic structural view of the main valve of the gas/liquid path of the present invention when closed.
Reference numbers in the figures: the air circuit pilot valve comprises an air circuit pilot valve 1, a liquid circuit main valve 2, a corrugated pipe assembly 3, a seamless corrugated pipe 10, a lower valve assembly 4, a lower valve spring 5, a lower valve core 8, a lower valve seat 11, a lower limiting block 12, an upper valve assembly 6, an upper valve spring 7, an upper valve core 9, an upper valve seat 13 and an upper limiting block 14.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
Examples
The pneumatic double-seal control valve comprises an air path pilot valve 1 and a liquid path main valve 2, wherein the air path pilot valve 1 is connected with the liquid path main valve 2 through a pipeline, and the liquid path main valve 2 is driven to open and close through the opening and closing of the air path pilot valve 1. The gas circuit pilot valve 1 is provided with a gas inlet and a gas outlet, and the gas inlet and the gas outlet are controlled to open and close through electromagnetic valves respectively. Preferably, the electromagnetic valve is a two-position three-way electromagnetic valve, is opened when electrified and closed when power is off, and is used for controlling the opening and closing of the main valve 2 of the liquid path, so that the on-off of the propellant is controlled.
An inlet and an outlet are arranged on the liquid path main valve 2, and the inlet and the outlet are respectively sealed by a spherical hard seal and a plunger O-shaped ring. Preferably, the liquid main valve 2 is made of titanium alloy material. The liquid path main valve 2 comprises a corrugated pipe assembly 3, a lower valve assembly 4 and an upper valve assembly 6, the corrugated pipe assembly 3, the lower valve assembly 4 and the upper valve assembly 6 are sequentially connected inside a shell of the liquid path main valve 2, the gas path pilot valve 1 is isolated from the liquid path main valve 2 through the corrugated pipe assembly 3, and the liquid path main valve 2 realizes double sealing through the lower valve assembly 4 and the upper valve assembly 6.
Wherein, the inside both sides of bellows subassembly 3 are connected with no welding seam bellows 10 respectively, and a plurality of no welding seam bellows 10 are arranged in an array. As shown in fig. 2, the lower valve assembly 4 includes a lower valve seat 11, a lower valve core 8, a lower valve spring 5 and a lower limiting block 12, the lower valve core 8 is connected in the lower valve seat 11, the lower valve spring 5 is uniformly distributed on two sides of a push rod of the lower valve assembly 4 through the lower limiting block 12, and the lower valve core 8 applies a pre-tightening force through the lower valve spring 5. As shown in fig. 3, the upper valve assembly 6 includes an upper valve spring 7, an upper valve core 9, an upper valve seat 13 and an upper limiting block 14, the upper valve core 9 is connected in the upper valve seat 13, one end of the upper valve spring 7 is connected to the upper valve core 9, the other end of the upper valve spring 7 is connected to the upper limiting block 14, the upper limiting block 14 is fixed at the end of the upper valve seat 13, and the upper valve core 9 applies a pre-tightening force through the upper valve spring 7.
More specifically, as shown in fig. 1, an embodiment of the present invention provides a high flow pneumatic dual-seal propellant control valve. The air circuit pilot valve comprises an air circuit pilot valve 1 and a liquid circuit main valve 2, wherein the liquid circuit main valve 2 comprises a corrugated pipe assembly 3, a lower valve assembly 4 and an upper valve assembly 6. The gas circuit pilot valve 1 is designed by adopting a two-position three-way electromagnetic valve, is opened when electrified and closed when power is off, and is used for controlling the opening and closing of the liquid circuit main valve 2 so as to control the on-off of the propellant. The main liquid path valve 2 realizes the opening or closing of the valve by the axial movement of the upper valve component and the lower valve component; reliable sealing when the valve is closed is realized by pressing and attaching the upper valve core and the lower valve core on the metal valve seat; the invention carries out redundancy design, utilizes a mode of mandril linkage and adopts a double-channel sealing structure so as to improve the sealing reliability. The inlet and outlet joints of the main valve 2 of the liquid path are connected with the inlet pipeline and the engine by adopting a double-sealing structure of spherical hard seal and plunger O-shaped ring seal so as to improve the sealing reliability. The weldless bellows 10 is installed in the bellows assembly 3, and is used for isolating a gas-liquid path of the control valve. An upper valve spring 7 is mounted within the upper valve assembly 6 for applying a pre-load to the upper valve assembly 6. A lower valve spring 5 is mounted in the lower valve assembly 4 for pre-stressing the lower valve assembly 4. A lower valve spool 8 is mounted within the lower valve assembly 4 for sealing against the propellant when closed. An upper valve spool 9 is mounted within the upper valve assembly 6 for sealing the propellant when closed.
The invention utilizes special structure, special design and special elastic element to meet the requirements of large flow, small flow resistance, light weight and reliable sealing of the system. The opening of the large-flow pneumatic double-sealing propellant control valve is 7.5mm, the power consumption is 26w, and the weight is 3.0 kg.
The working principle is as follows:when the electromagnetic valve is in an open state, the air inlet is opened, the air outlet is closed, the air path pilot valve 1 is opened, control air builds pressure in the corrugated pipe assembly 3 to push the corrugated pipe assembly 3 to act, an ejector rod of the corrugated pipe assembly 3 jacks up the lower valve core 8, the lower valve core 8 overcomes the pressure of a working medium and the spring force generated by the lower valve spring 5, the lower valve core 8 is separated from the lower valve seat 11, the lower valve assembly 4 is opened, the lower valve core 8 moves to the lower limiting block 12 for limiting, a push rod of the lower valve core 8 jacks up the upper valve core 9, the upper valve core 9 overcomes the pressure of the working medium and the spring force generated by the upper valve spring 7 to drive the upper valve core 9 to be separated from the upper valve seat 13, the upper valve assembly 6 is opened, the upper valve core 9 moves to the upper limiting block 14 for limiting, and the working medium flows;
or, the electromagnetic valve is closed, the air inlet is closed, the air outlet is opened, the air path pilot valve 1 is closed, the control air is discharged from the air outlet, the internal pressure of the corrugated pipe assembly 3 is reduced, the ejector rod of the corrugated pipe assembly 3 returns under the self resilience force of the corrugated pipe assembly 3, the lower valve core 8 returns under the driving of the spring force of the lower valve spring 5 and the pressure of the working medium, the lower valve seat 11 and the lower valve core 8 form a sealing pair, the lower valve assembly 4 is closed, the upper valve core 9 returns under the driving of the spring force generated by the upper valve spring 7 and the pressure of the working medium, the upper valve seat 13 and the upper valve core 9 form a sealing pair, the upper valve assembly 6 is closed, and the working medium is intercepted.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. The pneumatic double-seal control valve is characterized by comprising an air path pilot valve (1) and a liquid path main valve (2), wherein the air path pilot valve (1) is connected with the liquid path main valve (2) through a pipeline, and the liquid path main valve (2) is driven to open and close through the opening and closing of the air path pilot valve (1), so that the circulation and the interception of a propellant of the liquid path main valve (2) are realized;
the liquid path main valve (2) comprises a bellows assembly (3), a lower valve assembly (4) and an upper valve assembly (6), the bellows assembly (3), the lower valve assembly (4) and the upper valve assembly (6) are sequentially connected inside a shell of the liquid path main valve (2), the gas path pilot valve (1) is isolated from the liquid path main valve (2) through the bellows assembly (3), and the liquid path main valve (2) is isolated from the upper valve assembly (6) through the lower valve assembly (4) to realize double sealing.
2. The pneumatic dual seal control valve according to claim 1, wherein the bellows assembly (3), the lower valve assembly (4) and the upper valve assembly (6) are jointly braked.
3. The pneumatic dual-seal control valve according to claim 2, wherein the lower valve assembly (4) comprises a lower valve seat (11), a lower valve core (8), a lower valve spring (5) and a lower limiting block (12), the lower valve core (8) is connected in the lower valve seat (11), the lower valve spring (5) is uniformly distributed on two sides of a push rod of the lower valve assembly (4) through the lower limiting block (12), and the lower valve core (8) applies a pre-tightening force through the lower valve spring (5);
when the lower valve core (8) provides driving force through the lower valve seat (11), the lower valve core (8) overcomes the pressure of working media and the spring force generated by the lower valve spring (5), the lower valve core (8) is separated from the lower valve seat (11), the lower valve assembly (4) is opened, the lower valve core (8) moves to the lower limiting block (12) for limiting, and the working media flow;
when the lower valve core (8) cancels the driving force through the lower valve seat (11), the lower valve core (8) returns under the driving of the spring force of the lower valve spring (5) and the pressure of the working medium, the lower valve seat (11) and the lower valve core (8) form a sealing pair, the lower valve component (4) is closed, and the working medium is intercepted.
4. The pneumatic dual sealing control valve according to claim 2 or 3, wherein the upper valve assembly (6) comprises an upper valve spring (7), an upper valve core (9), an upper valve seat (13) and an upper limit block (14), the upper valve core (9) is connected in the upper valve seat (13), one end of the upper valve spring (7) is connected with the upper valve core (9), the other end of the upper valve spring (7) is connected with the upper limit block (14), the upper limit block (14) is fixed at the end of the upper valve seat (13), and the upper valve core (9) applies a pre-tightening force through the upper valve spring (7);
when the lower valve component (4) is opened, a push rod of the lower valve core (8) drives the upper valve core (9), the upper valve core (9) overcomes the pressure of working media and the spring force generated by the upper valve spring (7) to drive the upper valve core (9) to be separated from the upper valve seat (13), the upper valve component (6) is opened, the upper valve core (9) moves to the upper limiting block (14) for limiting, and the working media flow;
or when the lower valve component (4) is closed, the push rod of the lower valve core (8) cancels the driving force, the upper valve core (9) returns under the driving of the spring force generated by the upper valve spring (7) and the pressure of the working medium, the upper valve seat (13) and the upper valve core (9) form a sealing pair, the upper valve component (6) is closed, and the working medium is intercepted.
5. The pneumatic dual-seal control valve according to claim 1, wherein the pneumatic circuit pilot valve (1) is provided with an air inlet and an air outlet, and the air inlet and the air outlet are controlled to open and close by an electromagnetic valve respectively.
6. The dual sealing control valve of pneumatic type as claimed in claim 1, wherein the main valve of hydraulic circuit (2) is provided with an inlet and an outlet, and the inlet and the outlet are respectively sealed by a spherical hard seal and a plunger O-ring.
7. The pneumatic dual-seal control valve according to claim 5 or 6, wherein the control valve controls the opening and closing of the air inlet, and the opening and closing of the air inlet drives the opening and closing of the inlet and the outlet;
when the gas circuit pilot valve (1) is electrified, the control valve controls the gas inlet to be opened, the gas outlet to be closed, and the opening of the gas inlet drives the inlet and the outlet to be opened;
or when the gas circuit pilot valve (1) is powered off, the control valve controls the air inlet to be closed, the air outlet to be opened, and the closing of the air inlet drives the inlet and the outlet to be closed.
8. The pneumatic double-sealing control valve according to claim 3 or 4, wherein when the gas circuit pilot valve (1) is electrified to open, the control gas builds up pressure inside the bellows assembly (3) to push the bellows assembly (3) to act, the mandril of the bellows assembly (3) jacks up the lower valve core (8), the lower valve assembly (4) is opened, the mandril of the lower valve core (8) jacks up the upper valve core (9), the upper valve assembly (6) is opened to realize the opening of the liquid main valve (2);
or when the gas circuit pilot valve (1) is closed in a power-off mode, the internal pressure of the bellows assembly (3) is reduced, and the upper valve core (9) and the lower valve core (8) are closed under the combined action of the self resilience force of the bellows assembly (3) and the spring force generated by the upper valve spring (7) and the lower valve spring (5), so that the liquid main valve (2) is closed.
9. The pneumatic dual sealing control valve according to claim 1, wherein weldless bellows (10) are connected to both sides of the inside of the bellows assembly (3), respectively, and a plurality of the weldless bellows (10) are arranged in a matrix.
10. Pneumatic dual seal control valve according to claim 1, characterized in that the liquid main valve (2) is made of titanium alloy material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111307865.9A CN114215936A (en) | 2021-11-05 | 2021-11-05 | Pneumatic Double Seal Control Valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111307865.9A CN114215936A (en) | 2021-11-05 | 2021-11-05 | Pneumatic Double Seal Control Valve |
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| CN114215936A true CN114215936A (en) | 2022-03-22 |
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| CN202111307865.9A Pending CN114215936A (en) | 2021-11-05 | 2021-11-05 | Pneumatic Double Seal Control Valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992376A (en) * | 2022-07-18 | 2022-09-02 | 东方空间(西安)宇航技术有限公司 | Control valve and engine assembly |
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| CN209229109U (en) * | 2018-09-19 | 2019-08-09 | 北京航天动力研究所 | Ultralow temperature high pressure double spool linkage valve |
| CN109990099A (en) * | 2019-03-25 | 2019-07-09 | 北京星际荣耀空间科技有限公司 | A kind of high pressure air governor bacterium valve |
| CN213687105U (en) * | 2020-11-10 | 2021-07-13 | 佛山市金星徽电器有限公司 | Humidifier with detachable bivalve |
| CN112555426A (en) * | 2020-12-07 | 2021-03-26 | 西安航天动力研究所 | Double-control valve with high reliability for cabin double-pressure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114992376A (en) * | 2022-07-18 | 2022-09-02 | 东方空间(西安)宇航技术有限公司 | Control valve and engine assembly |
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Application publication date: 20220322 |