CN113944790B - High-temperature pressure reducing valve for solid attitude control system - Google Patents
High-temperature pressure reducing valve for solid attitude control system Download PDFInfo
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- CN113944790B CN113944790B CN202110987511.7A CN202110987511A CN113944790B CN 113944790 B CN113944790 B CN 113944790B CN 202110987511 A CN202110987511 A CN 202110987511A CN 113944790 B CN113944790 B CN 113944790B
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/32—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting on a servo-mechanism or on a catch-releasing mechanism
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/1262—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like one side of the diaphragm being spring loaded
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/126—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like
- F16K31/128—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a diaphragm, bellows, or the like servo actuated
Abstract
The invention discloses a high-temperature pressure reducing valve for a solid attitude control system, which comprises the following components: the valve comprises a valve core, a shell, a spring cover, an upper hard core, a diaphragm, a lower hard core, an upper pressing plate, a lower pressing plate, a spring upper seat, a loading spring, a spring lower seat, an adjusting rod, a bushing, a pressing sleeve, an outlet screw plug, an outlet heat insulation sleeve, a low-pressure cavity heat insulation sleeve, a self-locking nut, a bolt and a damping ring. The invention solves the problem of unstable outlet pressure under the working conditions of large flow and high temperature.
Description
Technical Field
The invention belongs to the technical field of pressure reducing valves of missiles, and particularly relates to a high-temperature pressure reducing valve for a solid attitude control system.
Background
The existing missile generally has the requirements of miniaturization and working temperature of normal temperature (-55 ℃ to +55 ℃) on the used pressure reducing valve, and the flow change in the whole flight process is smaller and basically kept in a rated state. Correspondingly, in the structure of the pressure reducing valve, a rubber cloth clamping flat diaphragm is used to meet the smaller stroke requirement caused by the change of inlet pressure only; because of the miniaturization and stable working condition, the pressure reducing valve is not provided with a damping device and a limiting structure. The pressure reducing valve is frequently vibrated and buzzed in the use process, the rubber cloth-clamping flat diaphragm is broken in the batch test process, and the reliability of the product is affected by the defect of the whole valve performance.
The flow rate of the pressurizing system is large in the working process of the solid attitude control system, and the working temperature reaches 1000 ℃, so that the pressure reducing valve is required to be under the working conditions of large flow rate and high temperature, and the dynamic stability is ensured to be good, and the outlet pressure deviation meets the requirement.
Disclosure of Invention
The invention solves the technical problems that: the high-temperature pressure reducing valve for the solid attitude control system overcomes the defects of the prior art, and solves the problem of unstable outlet pressure under the working conditions of high flow and high temperature.
The invention aims at realizing the following technical scheme: a high temperature relief valve for a solids control system, comprising: the valve comprises a valve core, a shell, a spring cover, an upper hard core, a diaphragm, a lower hard core, an upper pressing plate, a lower pressing plate, a spring upper seat, a loading spring, a spring lower seat, an adjusting rod, a bushing, a pressing sleeve, an outlet screw plug, an outlet heat insulation sleeve, a low-pressure cavity heat insulation sleeve, a self-locking nut, a bolt and a damping ring; the outlet heat insulation sleeve is embedded into the left outlet of the shell and is pressed and fixed through an outlet screw plug; the low-pressure cavity heat insulation sleeve is arranged in a low-pressure cavity at the lower part of the shell, the upper pressing plate is connected with the low-pressure cavity heat insulation sleeve, and the upper pressing plate is positioned at the lower part of the low-pressure cavity heat insulation sleeve; the valve core is fixed on the valve core by a pressing sleeve after being provided with a damping ring and pressing a gasket; the upper hard core is tightly pressed by the lower hard core after being assembled with the membrane; the valve core penetrates through the shell, and the spherical surface part of the middle section of the valve core is in contact limit with the small conical surface of the valve seat of the shell; a boss at the top of an upper hard core penetrates into a groove at the lower end of the valve core to form a hook type connecting structure in a low-pressure cavity at the lower part of the shell, and the valve core can be driven to move under the force balance effect after the diaphragm senses the outlet pressure; the bushing is connected with the upper end of the shell through threads; the spherical surface at the upper end of the spring upper seat is matched with the conical surface at the lower end of the upper hard core; the upper end of the loading spring is matched with the upper spring seat, the lower end of the loading spring is matched with the lower spring seat, and the loading spring is arranged between the diaphragm and the adjusting rod to provide spring force; in a low-pressure cavity at the lower part of the shell, the lower pressure plate presses the diaphragm, the spring cover is sleeved on the outer surface of the loading spring, and the spring cover, the diaphragm, the upper pressure plate and the lower pressure plate are all connected with the shell through self-locking nuts and bolts; the adjusting rod is arranged at the lower end of the inside of the spring cover and is used for adjusting the outlet pressure.
The high-temperature pressure reducing valve for the solid attitude control system further comprises: compressing the gasket; the pressing gasket is arranged at the connecting position of the pressing sleeve and the valve core.
The high-temperature pressure reducing valve for the solid attitude control system further comprises: a sealing gasket A; wherein, sealing pad A sets up in bush and casing junction position.
The high-temperature pressure reducing valve for the solid attitude control system further comprises: a sealing gasket B; the sealing gasket A is arranged at the connection position of the low-pressure cavity heat insulation sleeve and the upper pressing plate.
The high-temperature pressure reducing valve for the solid attitude control system further comprises: a lock nut; wherein, lock nut with the bottom of spring housing is connected.
The high-temperature pressure reducing valve for the solid attitude control system further comprises: a flat gasket; wherein the flat gasket is sleeved on the outer surface of the bolt; the flat gasket is positioned between the self-locking nut and the compression gasket.
In the high-temperature pressure reducing valve for the solid attitude control system, the outlet screw plug is connected with the outlet on the left side of the shell, and the outlet screw plug is in pressure connection with the outlet heat insulation sleeve.
In the high-temperature pressure reducing valve for the solid attitude control system, the bushing and the shell form a sealed high-pressure cavity, and the bushing provides guiding and limiting for the valve core.
In the high-temperature pressure reducing valve for the solid attitude control system, the stroke h2 of the valve core is 1.2 mm-1.3 mm.
In the high-temperature pressure reducing valve for the solid attitude control system, the sealing gasket B adjusts the diaphragm pre-deflection h1 to be 0.25-0.35 mm.
Compared with the prior art, the invention has the following beneficial effects:
(1) The invention solves the problem of unstable outlet pressure under the working condition of large flow and high temperature;
(2) The invention realizes the effect of large stroke of the sensitive element through the design of the diaphragm corrugated structure;
(3) According to the invention, through the design of the limiting structure, the effect of strong shock resistance is realized;
(4) According to the invention, the hook type linkage structure is adopted between the sensitive elements, so that the problem that the auxiliary spring material fails at high temperature and cannot provide return force is solved, and the effects of no return spring and normal return of the valve core are achieved.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 is a schematic diagram of a high temperature pressure reducing valve for a solid attitude control system according to an embodiment of the present invention;
fig. 2 is an enlarged view of a portion a in fig. 1.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other. The invention will be described in detail below with reference to the drawings in connection with embodiments.
Fig. 1 is a schematic structural diagram of a high-temperature pressure reducing valve for a solid attitude control system according to an embodiment of the present invention. As shown in fig. 1, the high-temperature pressure reducing valve for a solid attitude control system includes: the valve comprises a valve core 1, a shell 3, a spring cover 4, an upper hard core 5, a diaphragm 6, a lower hard core 7, an upper pressing plate 8, a lower pressing plate 9, a spring upper seat 10, a loading spring 11, a spring lower seat 12, an adjusting rod 13, a bushing 14, a pressing sleeve 15, an outlet screw plug 16, an outlet heat insulation sleeve 17, a low-pressure cavity heat insulation sleeve 18, a bolt heat insulation plate 19, a fastening heat insulation sleeve 20, a self-locking nut 27, a bolt 28 and a damping ring 29; wherein, the liquid crystal display device comprises a liquid crystal display device,
the outlet heat insulation sleeve 17 is embedded into the left outlet of the shell 3 and is pressed and fixed through the outlet screw plug 16, the outlet screw plug 16 is connected with the left outlet of the shell 3, and the outlet screw plug 16 is in pressure connection with the outlet heat insulation sleeve 17; the low-pressure cavity heat insulation sleeve 18 is arranged in a low-pressure cavity at the lower part of the shell 3, the upper pressing plate 8 is connected with the low-pressure cavity heat insulation sleeve 18, and the upper pressing plate 8 is positioned at the lower part of the low-pressure cavity heat insulation sleeve 18; the valve core 1 is fixed on the valve core 1 by a pressing sleeve 15 after being provided with a damping ring 29 and a pressing gasket 21; the upper hard core 5 is tightly pressed by the lower hard core 7 after being assembled with the membrane 6; the assembled valve core 1 passes through the shell 3 from top to bottom, the spherical surface part of the middle section of the valve core 1 contacts with the small conical surface of the valve seat of the shell 3 to limit, and the opening H can be automatically adjusted in the working process; a low-pressure cavity at the lower part of the shell 3, a boss at the top of the assembled upper hard core 5 penetrates into a groove at the lower end of the valve core 1 to form a hook type connecting structure, and the diaphragm 6 can drive the valve core to move under the force balance effect after sensing the outlet pressure; the bushing 14 is connected with the upper end of the shell 3 through threads, the bushing 14 and the shell 3 form a sealed high-pressure cavity, and the bushing 14 provides guiding and limiting for the valve core 1; the spherical surface of the upper end of the spring upper seat 10 is matched with the conical surface of the lower end of the upper hard core 5; the upper end of the loading spring 11 is matched with the spring upper seat 10, the lower end of the loading spring 11 is matched with the spring lower seat 12, and the loading spring 11 is arranged between the diaphragm 6 and the adjusting rod 13 to provide spring force; in a low-pressure cavity at the lower part of the shell 3, the lower pressure plate 9 presses the diaphragm 6, the spring cover 4 is sleeved on the outer surface of the loading spring 11, and the spring cover 4, the diaphragm 6, the upper pressure plate 8 and the lower pressure plate 9 are connected with the shell 3 through self-locking nuts 27 and bolts 28; an adjusting lever 13 is installed at the inner lower end of the spring housing 4 for adjusting the outlet pressure.
As shown in fig. 1, the high-temperature pressure reducing valve for the solid attitude control system further includes: a pressing pad 21; wherein, the pressing gasket 21 is arranged at the connecting position of the pressing sleeve 15 and the valve core 1.
As shown in fig. 1, the high-temperature pressure reducing valve for the solid attitude control system further includes: a gasket a22; wherein the gasket a22 is provided at the connection position of the bushing 14 and the housing 3.
As shown in fig. 1, the high-temperature pressure reducing valve for the solid attitude control system further includes: a gasket B23; wherein, the sealing gasket A22 is arranged at the connection position of the low-pressure cavity heat insulation sleeve 18 and the upper pressing plate 8.
As shown in fig. 1, the high-temperature pressure reducing valve for the solid attitude control system further includes: a lock nut 24; wherein the lock nut 24 is connected with the bottom of the spring housing 4.
As shown in fig. 1, the high-temperature pressure reducing valve for the solid attitude control system further includes: a flat gasket 26; wherein the flat washer 26 is sleeved on the outer surface of the bolt 28; the flat washer 26 is located between the self-locking nut 27 and the compression washer 21.
When the solid attitude control system works, high-temperature fuel gas conveyed from the upstream enters an inlet and a high-pressure cavity of the pressure reducing valve, throttles through a gap between the valve core and a valve seat of the shell (called valve core opening), enters a low-pressure cavity, and gas in the low-pressure cavity flows to a downstream pipeline through an outlet, and meanwhile, the gas in the low-pressure cavity directly acts on the diaphragm. The balance of the main spring force, the air pressure acting on the diaphragm and the valve core and other component forces ensures that the outlet pressure deviation of the pressure reducing valve is within a specified range. If the outlet pressure is higher than the allowable working pressure range for some reason, the air pressure on the diaphragm is increased, the main spring is compressed, the valve core moves upwards under the action of the air pressure, the opening degree of the valve core is reduced, the pressure of the low-pressure cavity is reduced, and the pressure returns to the allowable working pressure range. Conversely, when the outlet pressure is below the allowable operating pressure range, the process is reversed. After the outlet rated point is assembled and regulated, the main spring pushes the valve core open to make the valve core in full open state, and the valve core opening is maximum. When the valve works, the upstream air source is opened, the inlet of the pressure reducing valve is communicated with high-pressure air, the diaphragm of the pressure reducing valve is loaded by the air pressure, the opening of the valve core is reduced, and finally the working state is achieved.
As shown in fig. 1 and 2, the assembly requires a spool 1 stroke h2=1.2 to 1.3mm; the diaphragm 6 is adjusted to be pre-biased to h1=0.25-0.35 mm (downwards) by selecting a sealing gasket B23; the maximum static friction force between the damping ring 29 and the shell 3 is adjusted to be 5.5-6 kg by adjusting the tightening torque between the pressing sleeve 15 and the valve core 1.
The pressure reducing valve of the embodiment has high requirement on outlet pressure precision, and adopts a direct action unloading reverse scheme. On the internal structure:
(1) The sensitive element is made of metal corrugated film. The deformation of the sensitive element is larger due to the larger flow of the pressure reducing valve, and the effective area of the sensitive element is limited when the main spring is designed. And respectively carrying out structural optimization design on the sealing function region and the deformation function region, wherein the central region with larger deformation adopts a corrugated structure to meet the requirement of a pressure reducing valve on a large stroke.
(2) The damping element is a graphite damping ring. Compared with the limitation of the service temperature of a conventional rubber damping element and the instability of damping force after repeated friction, on one hand, the graphite damping ring arranged on the valve core is matched with the shell to realize friction damping, and after the valve core works for many times, the matching state of the graphite damping ring and the shell is not changed, so that the friction damping force is stable; and the upper limit of the working temperature reaches 1000 ℃.
(3) And a limit structure is reasonably arranged. On the one hand, the product state and consistency are ensured through the structural size of the product, meanwhile, the vibration and the ringing which are possibly generated are quickly attenuated under the condition of ensuring the performance of the product due to the fact that the use condition is relatively large, and the product rapidly reaches dynamic balance.
(4) And (5) heat insulation design. According to the structure of the pressure reducer, the parts sensitive to high temperature are a main spring and a diaphragm (the auxiliary spring is eliminated). The high silica heat insulation structure is arranged at the main part of heat conduction, so that the temperature of the main spring and the diaphragm can be effectively reduced. To prevent the heating of the air flow, a heat insulating lining is provided in the outlet air flow channel, and to prevent the conduction of heat through the housing, a heat insulating lining is provided between the housing and the membrane.
The invention realizes the effect of large stroke of the sensitive element through the design of the diaphragm corrugated structure. According to the invention, through the design of the limiting structure, the effect of strong shock resistance is realized; according to the invention, through the simulation analysis of the dynamic stability of the whole valve and the simulation analysis of the fluid-solid coupling of the system, the friction damping of the motion system in the valve is determined, so that the dynamic stability of the whole valve is achieved; according to the invention, a hook type linkage structure is adopted between the sensitive elements, so that the problem that the auxiliary spring material fails at high temperature and cannot provide return force is solved, and the effects of no return spring and normal return of the valve core are achieved; according to the invention, the high silica heat insulation structure is designed for the high temperature sensitive part, so that the problems of safety in use and rated point drift caused by material mechanical property reduction under high temperature condition are solved, the heat insulation efficiency reaches 73%, the normal temperature outlet pressure characteristic of the product is completely consistent with the working temperature, and the test coverage of normal temperature to the working temperature is realized.
Although the present invention has been described in terms of the preferred embodiments, it is not intended to be limited to the embodiments, and any person skilled in the art can make any possible variations and modifications to the technical solution of the present invention by using the methods and technical matters disclosed above without departing from the spirit and scope of the present invention, so any simple modifications, equivalent variations and modifications to the embodiments described above according to the technical matters of the present invention are within the scope of the technical matters of the present invention.
Claims (8)
1. A high temperature pressure reducing valve for a solids control system, comprising: the valve comprises a valve core (1), a shell (3), a spring cover (4), an upper hard core (5), a diaphragm (6), a lower hard core (7), an upper pressing plate (8), a lower pressing plate (9), a spring upper seat (10), a loading spring (11), a spring lower seat (12), an adjusting rod (13), a bushing (14), a pressing sleeve (15), an outlet screw plug (16), an outlet heat insulation sleeve (17), a low-pressure cavity heat insulation sleeve (18), a self-locking nut (27), a bolt (28) and a damping ring (29); wherein, the liquid crystal display device comprises a liquid crystal display device,
the outlet heat insulation sleeve (17) is embedded into the left outlet of the shell (3) and is pressed and fixed through the outlet screw plug (16);
the low-pressure cavity heat insulation sleeve (18) is arranged in a low-pressure cavity at the lower part of the shell (3), the upper pressing plate (8) is connected with the low-pressure cavity heat insulation sleeve (18), and the upper pressing plate (8) is positioned at the lower part of the low-pressure cavity heat insulation sleeve (18);
the valve core (1) is fixed on the valve core (1) by a pressing sleeve (15) after being provided with a damping ring (29) and a pressing gasket (21); the upper hard core (5) is tightly pressed by the lower hard core (7) after being assembled with the membrane (6);
the valve core (1) penetrates through the shell (3), and the spherical surface part of the middle section of the valve core (1) is in contact limit with the small conical surface of the valve seat of the shell (3);
the boss at the top of the upper hard core (5) penetrates into the groove at the lower end of the valve core (1) to form a hook type connecting structure;
the bushing (14) is connected with the upper end of the shell (3) through threads;
the spherical surface of the upper end of the spring upper seat (10) is matched with the conical surface of the lower end of the upper hard core (5);
the upper end of the loading spring (11) is matched with the spring upper seat (10), the lower end of the loading spring (11) is matched with the spring lower seat (12), and the loading spring (11) is arranged between the diaphragm (6) and the adjusting rod (13) to provide spring force;
the lower pressing plate (9) presses the diaphragm (6), the spring cover (4) is sleeved on the outer surface of the loading spring (11), and the spring cover (4), the diaphragm (6), the upper pressing plate (8) and the lower pressing plate (9) are connected with the shell (3) through self-locking nuts (27) and bolts (28);
the adjusting rod (13) is arranged at the lower end of the inside of the spring cover (4) and is used for adjusting the outlet pressure;
the stroke h2 of the valve core (1) is 1.2 mm-1.3 mm;
the sealing gasket B (23) adjusts the pre-deflection h1 of the diaphragm (6) to be 0.25-0.35 mm;
when the solid attitude control system works, high-temperature fuel gas conveyed from the upstream enters an inlet of a pressure reducing valve and a high-pressure cavity, after being throttled by a clearance between a valve core and a valve seat of a shell, the fuel gas enters a low-pressure cavity, gas in the low-pressure cavity flows to a downstream pipeline through an outlet, and meanwhile, the gas in the low-pressure cavity directly acts on a diaphragm; the balance of the main spring force and the air pressure acting on the diaphragm and the valve core is formed, so that the outlet pressure deviation of the pressure reducing valve is ensured to be within a specified range; after the outlet rated point is assembled and regulated, the main spring pushes the valve core open to make the valve in a full-open state, and the valve core opening reaches the maximum; when the valve works, the upstream air source is opened, the inlet of the pressure reducing valve is communicated with high-pressure air, the diaphragm of the pressure reducing valve is loaded by the air pressure, the opening of the valve core is reduced, and finally the working state is achieved.
2. The high temperature relief valve for a solids control system of claim 1, further comprising: a pressing pad (21); the pressing gasket (21) is arranged at the connecting position of the pressing sleeve (15) and the valve core (1).
3. The high temperature relief valve for a solids control system of claim 1, further comprising: a gasket A (22); wherein the sealing gasket A (22) is arranged at the connecting position of the bushing (14) and the shell (3).
4. The high temperature relief valve for a solids control system of claim 1, further comprising: a gasket B (23); the sealing gasket B (23) is arranged at the connecting position of the low-pressure cavity heat insulation sleeve (18) and the upper pressing plate (8).
5. The high temperature relief valve for a solids control system of claim 1, further comprising: a lock nut (24); wherein the lock nut (24) is connected with the bottom of the spring cover (4).
6. The high temperature relief valve for a solids control system of claim 2, further comprising: a flat gasket (26); wherein the flat gasket (26) is sleeved on the outer surface of the bolt (28); the flat gasket (26) is positioned between the self-locking nut (27) and the pressing gasket (21).
7. The high temperature relief valve for a solids control system of claim 1, wherein: the outlet screw plug (16) is connected with the left outlet of the shell (3), and the outlet screw plug (16) is in pressure connection with the outlet heat insulation sleeve (17).
8. The high temperature relief valve for a solids control system of claim 1, wherein: the bushing (14) and the shell (3) form a sealed high-pressure cavity, and the bushing (14) provides guiding and limiting for the valve core (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202110987511.7A CN113944790B (en) | 2021-08-26 | 2021-08-26 | High-temperature pressure reducing valve for solid attitude control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110987511.7A CN113944790B (en) | 2021-08-26 | 2021-08-26 | High-temperature pressure reducing valve for solid attitude control system |
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| CN113944790A CN113944790A (en) | 2022-01-18 |
| CN113944790B true CN113944790B (en) | 2023-06-06 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749465A (en) * | 2008-12-02 | 2010-06-23 | 上海宇航系统工程研究所 | Double-valve seat pressure-reducing valve |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101446363B (en) * | 2008-12-29 | 2011-01-26 | 北京航天万源煤化工工程技术有限公司 | Metallic film type reducing valve |
| US9523988B2 (en) * | 2009-12-22 | 2016-12-20 | Forbes Marshall Steam Systems Private Limited | Pressure reducing valves with multiple heads and seats |
| CN105673900B (en) * | 2016-02-23 | 2017-11-17 | 上海井和海船用阀门有限公司 | Ship air reducing valve |
| JP6710087B2 (en) * | 2016-03-31 | 2020-06-17 | 大阪瓦斯株式会社 | Pressure regulator |
| CN110131477B (en) * | 2019-05-29 | 2021-07-23 | 河南航天液压气动技术有限公司 | Multistage throttle labyrinth relief pressure valve |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101749465A (en) * | 2008-12-02 | 2010-06-23 | 上海宇航系统工程研究所 | Double-valve seat pressure-reducing valve |
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