CN110762239B - High-pressure unloading type gunpowder gas actuated valve - Google Patents
High-pressure unloading type gunpowder gas actuated valve Download PDFInfo
- Publication number
- CN110762239B CN110762239B CN201911149319.XA CN201911149319A CN110762239B CN 110762239 B CN110762239 B CN 110762239B CN 201911149319 A CN201911149319 A CN 201911149319A CN 110762239 B CN110762239 B CN 110762239B
- Authority
- CN
- China
- Prior art keywords
- base body
- conical surface
- diameter
- small
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0254—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor being operated by particular means
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
-
- 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
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
-
- 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
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Valves (AREA)
Abstract
The invention relates to a high-pressure unloading type gunpowder gas actuated valve, aiming at solving the problems that an electric explosion valve in the prior art can only be in a certain pressure range, cuttings can not be processed in time, the production cost is high, and wedging positioning is not firm. The invention comprises an electric detonator, a matrix, a blind pipe and a cutter assembly; the left end of the base body is provided with an electric explosion tube, the right end of the base body is symmetrically provided with two blind tubes along the circumferential direction, and a cutter assembly is arranged in the base body; the cutter assembly comprises a large-diameter driving section, a small-diameter cutting section and a small-diameter unloading section which are sequentially connected from left to right; a gas fire-blocking sealing ring is arranged between the outer wall of the large-diameter driving section and the inner wall of the base body; the left part of the small-diameter cutting section is provided with an overflowing hole; the right part is provided with two mutually symmetrical grooves; an unloading sealing ring is arranged between the small-diameter unloading section and the base body; the closed end of the blind pipe penetrates through the base body and then is matched with the groove; the right side of the cutter component in the base body is also provided with a cavity capable of containing the small-diameter cutting section and a cavity for wedging the cutter component and the base body.
Description
Technical Field
The invention relates to a gunpowder gas actuated valve, in particular to a high-pressure unloading type gunpowder gas actuated valve.
Background
The high-pressure unloading type gunpowder gas actuated valve is one of important automatic device components on a rocket propulsion system, and plays a role in controlling fluid in the system. The valve is operated by high-pressure gas generated by gunpowder combustion and explosion, and the sealing is ensured by a metal-to-metal wedge-caulking sealing structure, so that the valve has the characteristics of reliable operation, good sealing property, small size, light weight, high response speed, capability of actuating only by a small pulse power supply and the like, and is widely applied to a one-off projectile propulsion system.
The existing electric explosion valve has the following problems:
1) in the existing electric explosion valve, a non-unloading structure is mostly adopted, so that the movement reliability of the electric explosion valve is related to the working pressure seal, the electric explosion valve can only work within a certain pressure range, and the cutter moves over and is structurally damaged due to low working pressure; the high working pressure causes that the cutter can not move in place and the flow channel can not be smooth.
2) A large amount of cutting scraps are generated in the process of conical surface wedging and positioning of the existing electric explosion valve, and the cutting scraps enter a flow channel to influence the normal work of other products.
3) The existing electric explosion valve mostly adopts a single blind pipe structure, a moving part and a non-metal sealing part are in contact with the environment, the moving part and the non-metal sealing part mostly do not adopt a vacuum-resistant design, the electric explosion valve cannot be suitable for a vacuum environment, and even if the vacuum-resistant design is adopted, the problems of high production cost and difficult quality control exist.
4) The existing electric explosion valve adopts a single conical surface positioning structure after action, and has the problem of infirm wedging positioning.
The above problems have seriously affected the operational reliability of the system and the application range of the electric explosion valve.
Disclosure of Invention
The invention aims to solve the problems that an electric explosion valve in the prior art can only be within a certain pressure range, cuttings can not be processed in time, the production cost is high, and wedging and positioning are not firm, and provides a high-pressure unloading type gunpowder gas-operated valve.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention relates to a high-pressure unloading type gunpowder gas actuated valve which is characterized in that: comprises an electric detonator, a matrix, a blind pipe and a cutter assembly;
the left end of the base body is provided with an electric explosion tube, the right end of the base body is symmetrically provided with two blind tubes along the circumferential direction, and a cutter assembly is arranged in the base body; the cutter assembly moves rightwards under the action of the electric detonator;
the cutter assembly comprises a large-diameter driving section, a small-diameter cutting section and a small-diameter unloading section which are sequentially connected from left to right;
a gas fire-blocking sealing ring is arranged between the outer wall of the large-diameter driving section and the inner wall of the base body;
the left part of the small-diameter cutting section is provided with an overflowing hole; the right part is provided with two mutually symmetrical grooves;
an unloading sealing ring is arranged between the outer wall of the small-diameter unloading section and the inner wall of the base body;
the closed end of the blind pipe penetrates through the base body and then is matched with the groove;
and a cavity capable of containing a small-diameter cutting section and a cavity for wedging the cutter assembly and the base body are sequentially arranged on the right side of the cutter assembly in the base body.
When the cutter assembly moves rightwards to a proper position, the closed ends of the two blind pipes are cut off, and the overflowing holes are just connected with the two blind pipes to enable the blind pipes to be communicated.
Furthermore, in order to improve the reliability of wedging positioning, the inner wall of the base body is provided with a first conical surface and a second conical surface which are respectively positioned at two sides of the blind pipe;
a third conical surface matched and wedged with the first conical surface is arranged on the outer wall of the large-diameter driving section;
and a fourth conical surface matched with the second conical surface for wedging is arranged on the outer wall of the small-diameter unloading section.
Furthermore, the wedging range of the first conical surface and the third conical surface is 0.3mm-0.5 mm;
the wedging range of the second conical surface and the fourth conical surface is 0.3mm-0.6 mm.
Further, the taper of the first conical surface and the third conical surface is 30 degrees;
the taper of the second conical surface and the taper of the fourth conical surface are 20 degrees.
Furthermore, in order to collect the cutting chips in time and prevent the cutting chips from entering other parts of the base body, the third conical surface is provided with an annular chip groove.
Further, in order to improve the cutting efficiency, the wall thickness of the closed end of the blind pipe is 0.4-0.6 mm.
Furthermore, the blind pipe is made of metal materials, and the blind pipe and the base body are welded. Preventing the medium from leaking.
Further, the overflowing hole is a kidney-shaped hole.
The invention has the beneficial effects that:
1. the right end of the cutter assembly is a small-diameter unloading section, an unloading sealing ring is arranged between the outer wall of the small-diameter unloading section and the inner wall of the base body, high-temperature and high-pressure gas is generated after an electric explosion tube is electrified and exploded, the cutter assembly moves rightwards under the driving of the high-pressure gas, so that the gas pressure of the first cavity and the gas pressure of the second cavity are increased, the movement of the cutter assembly can be blocked, the cutter assembly moves rightwards more smoothly due to the arrangement of the unloading sealing ring, and the reliability of the gunpowder gas actuating valve is improved.
2. According to the invention, two groups of conical surface wedging structures which are matched with each other are arranged on the cutter assembly and the inner wall of the base body, so that the cutter assembly and the base body are wedged more stably and positioned more firmly.
3. According to the invention, two blind pipes are symmetrically arranged on two sides of the base body along the circumferential direction of the base body, so that the whole action valve can bear pressure in a bidirectional and long-term loading manner, and the adaptability to high-low temperature environments and vacuum environments is higher.
4. According to the invention, the annular chip groove is formed in the third conical surface, so that chips generated in the impacting process are prevented from entering the flow channel, and the wedging is reliable.
Drawings
FIG. 1 is a schematic structural diagram of a high-pressure unloading type powder gas actuating valve before actuation;
FIG. 2 is a schematic view of a high pressure unloading type powder gas actuated valve after actuation;
fig. 3 is an enlarged view of a in fig. 2.
In the figure, 1-basal body, 11-first conical surface, 12-second conical surface, 2-electric detonator, 3-blind pipe, 4-cutter component, 41-large diameter driving section, 411-third conical surface, 412-fourth conical surface, 413-annular chip groove, 42-small diameter cutting section, 421-overflowing hole, 422-groove, 43-small diameter unloading section,
5-gas fire-blocking sealing ring, 6-unloading sealing ring, 7-first cavity and 8-second cavity.
Detailed Description
To make the objects, advantages and features of the present invention more apparent, a high pressure unloading type powder gas actuated valve according to the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following detailed description. It should be noted that: the drawings are in simplified form and are not to precise scale, the intention being solely for the convenience and clarity of illustrating embodiments of the invention; second, the structures shown in the drawings are often part of actual structures.
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a high-pressure unloading type gunpowder gas actuated valve, which is shown by combining a figure 1 and a figure 2 and comprises a base body 1, an electric explosion tube 2, a blind tube 3 and a cutter component 4; an electric explosion tube 2 is arranged at the left end of the base body 1, two blind tubes 3 are symmetrically arranged at the right end of the base body 1 along the circumferential direction of the base body, and a cutter assembly 4 is arranged in the base body 1; the cutter assembly 4 moves rightwards under the action of the electric detonator 2;
the cutter assembly 4 comprises a large-diameter driving section 41, a small-diameter cutting section 42 and a small-diameter unloading section 43 which are sequentially connected from left to right; a gas fire-blocking sealing ring 5 is arranged between the outer wall of the large-diameter driving section 41 and the inner wall of the base body 1; the left part of the small-diameter cutting section 42 is provided with an overflowing hole 421; the overflowing hole 421 is a waist-shaped hole; the right part is provided with two mutually symmetrical grooves 422; an unloading sealing ring 6 is arranged between the outer wall of the small-diameter unloading section 43 and the inner wall of the base body 1; the closed end of the blind pipe 3 penetrates through the outer wall of the base body 1 and then is matched with the groove 422; the blind pipe 3 and the base body 1 are welded to prevent the medium from leaking. The blind pipe 3 adopts a split type bidirectional isolation structure made of metal materials, and the blind pipe 3 and the base body 1 are welded to ensure that the product can bear high pressure in two directions. The wall thickness of the part of the blind pipe 3 which is matched with the groove 422 is 0.5 mm.
The right side of the cutter component 4 in the base body 1 is also sequentially provided with a first cavity 7 capable of containing a small-diameter cutting section and a second cavity 8 for wedging the cutter component and the base body.
Therefore, high-temperature and high-pressure gas is generated when the electric explosion tube 2 is electrified and exploded, and the high-temperature and high-pressure gas is effectively sealed by the gas fire-blocking sealing ring and cannot enter the base body 1; under the drive of high-pressure gas, the cutter assembly 4 moves rightwards, the groove 422 on the small-diameter cutting section 42 cuts off the thin-wall structure (namely the closed end) of the two blind pipes 3, the overflowing hole 421 is communicated with the two blind pipes 3, the medium flow channel is opened, and the working medium acts on the action area between the unloading sealing ring 6 and the gas fire-blocking sealing ring 5. Meanwhile, when the cutter assembly 4 moves rightwards, the air pressure in the first cavity 7 and the air pressure in the second cavity 8 will rise, the air pressure rise will block the cutter assembly 4 from moving rightwards, and the unloading sealing ring 6 is arranged to release the pressure, so that the cutter assembly 4 can move more smoothly and reliably.
Preferably, the inner wall of the base body 1 is provided with a first conical surface 11 and a second conical surface 12 which are respectively positioned at two sides of the blind pipe 3; a third conical surface 411 matched and wedged with the first conical surface 11 is arranged on the outer wall of the large-diameter driving section 41; the outer wall of the small-diameter unloading section 43 is provided with a fourth conical surface 412 which is matched and wedged with the second conical surface 12. The wedging range of the first conical surface 11 and the third conical surface 411 is 0.3mm-0.5 mm; the wedging range of the second conical surface 12 and the fourth conical surface 412 is 0.3mm-0.6 mm. The conicity of the first conical surface 11 and the third conical surface 411 is 30 degrees; the taper of the second tapered surface 12 and the fourth tapered surface 412 is 20 °.
Therefore, when the cutter assembly moves rightwards, after the first conical surface 11 and the third conical surface 411 are impacted and wedged to move for a distance of 0.3mm-0.5mm, the second conical surface 12 and the fourth conical surface 412 are contacted and move for a distance of 0.3mm-0.6mm, and at the moment, the cutter assembly and the base body are reliably locked and sealed; and the overflowing holes just face the two blind pipes to be communicated when the blind pipes are locked, so that the two groups of conical surfaces are wedged tightly and the positioning effect is also realized.
Preferably, as shown in fig. 3, the third tapered surface 411 is provided with an annular chip groove 413, so that chips generated in the impact process are prevented from entering the flow channel, and the wedging is reliable.
Therefore, when the first conical surface 11 and the third conical surface 411 are impacted and wedged to move 0.3mm-0.5mm, chips are inevitably generated due to high-speed impact and interference fit, and the generated chips do not enter the flow channel through the arrangement of the annular chip grooves 413.
The main components of the high-pressure unloading type gunpowder gas actuated valve have the following functions:
unloading sealing rings: the pneumatic cutter is mainly used for reducing the air pressure in the first cavity 7 and the second cavity 8, so that the cutter assembly moves more smoothly rightwards;
two blind pipes: the main effect is that before the electric explosion, the two sides of the substrate can be loaded for a long time, and the substrate is of an all-metal structure, has no non-metal sealing, and has high adaptability to high and low temperature environments and vacuum environments.
Annular chip pocket 413: the first tapered surface 11 and the third tapered surface 411 are mainly used for accommodating chips generated in the process of impact wedging, so that the chips cannot enter the flow channel.
First tapered surface 11, third tapered surface 411, second tapered surface 12, fourth tapered surface 412: the first conical surface 11 and the third conical surface 411 are a group of conical surfaces which are matched with each other, the second conical surface 12 and the fourth conical surface 412 are a group of conical surfaces which are matched with each other, the two groups of conical surfaces enable the wedging of the cutter assembly and the base body 1 to be more reliable, the sealing effect is also improved, the positioning effect is also achieved, and the overflowing hole is enabled to be just communicated with the two blind pipes.
Claims (7)
1. A high pressure unloading type gunpowder gas actuated valve is characterized in that: comprises a substrate (1), an electric explosion tube (2), a blind tube (3) and a cutter component (4);
an electric explosion tube (2) is arranged at the left end of the base body (1), two blind tubes (3) are symmetrically arranged at the right end of the base body (1) along the axial direction, and a cutter assembly (4) is arranged in the base body (1); the cutter component (4) moves rightwards under the action of the electric detonator (2);
the cutter assembly (4) comprises a large-diameter driving section (41), a small-diameter cutting section (42) and a small-diameter unloading section (43) which are sequentially connected from left to right;
a gas fire-blocking sealing ring (5) is arranged between the outer wall of the large-diameter driving section (41) and the inner wall of the base body (1);
the left part of the small-diameter cutting section (42) is provided with an overflowing hole (421); the right part is provided with two mutually symmetrical grooves (422);
an unloading sealing ring (6) is arranged between the outer wall of the small-diameter unloading section (43) and the inner wall of the base body (1);
the closed end of the blind pipe (3) penetrates through the base body (1) and then is matched with the groove (422);
a first cavity (7) capable of containing a small-diameter cutting section and a second cavity (8) for wedging the cutter assembly and the base body are sequentially arranged on the right side of the cutter assembly (4) in the base body (1);
the inner wall of the base body (1) is provided with a first conical surface (11) and a second conical surface (12) which are respectively positioned at two sides of the blind pipe (3);
a third conical surface (411) matched and wedged with the first conical surface (11) is arranged on the outer wall of the large-diameter driving section (41);
and a fourth conical surface (412) matched with the second conical surface (12) for wedging is arranged on the outer wall of the small-diameter unloading section (43).
2. The high pressure unloading type powder gas actuated valve according to claim 1, characterized in that:
the wedging range of the first conical surface (11) and the third conical surface (411) is 0.3mm-0.5 mm;
the wedging range of the second conical surface (12) and the fourth conical surface (412) is 0.3mm-0.6 mm.
3. The high pressure unloading type powder gas actuated valve as claimed in claim 2, wherein:
the conicity of the first conical surface (11) and the third conical surface (411) is 30 degrees;
the taper of the second conical surface (12) and the taper of the fourth conical surface (412) are 20 degrees.
4. A high pressure unloading type powder gas operated valve according to any one of claims 1 to 3, characterized in that:
an annular chip groove (413) is formed in the third conical surface (411).
5. The high pressure unloading type powder gas actuated valve according to claim 4, characterized in that:
the wall thickness of the closed end of the blind pipe (3) is 0.4-0.6 mm.
6. The high pressure unloading type powder gas actuated valve according to claim 5, characterized in that:
the blind pipe (3) is made of metal materials, and the blind pipe (3) is welded with the base body (1).
7. The high pressure unloading type powder gas actuated valve as claimed in claim 6, wherein:
the overflowing hole (421) is a waist-shaped hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149319.XA CN110762239B (en) | 2019-11-21 | 2019-11-21 | High-pressure unloading type gunpowder gas actuated valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911149319.XA CN110762239B (en) | 2019-11-21 | 2019-11-21 | High-pressure unloading type gunpowder gas actuated valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110762239A CN110762239A (en) | 2020-02-07 |
| CN110762239B true CN110762239B (en) | 2021-07-20 |
Family
ID=69339105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911149319.XA Active CN110762239B (en) | 2019-11-21 | 2019-11-21 | High-pressure unloading type gunpowder gas actuated valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110762239B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113418031B (en) * | 2021-05-21 | 2022-07-05 | 西安航天动力研究所 | Push-pull combined type detonating electric explosion valve |
| CN113819286A (en) * | 2021-09-23 | 2021-12-21 | 中国工程物理研究院总体工程研究所 | Normally closed type intubation electric explosion valve |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4235068A1 (en) * | 1992-10-17 | 1994-04-21 | Pagg Produktions Ag Giswil Gis | Fast closing valve |
| CN102537452B (en) * | 2011-12-27 | 2016-08-03 | 上海空间推进研究所 | A kind of high pressure buffer valve |
| CN202992217U (en) * | 2012-12-18 | 2013-06-12 | 中国航天科技集团公司第六研究院第十一研究所 | Bilateral lancing-type normally closed titanium alloy gunpowder gas actuated valve for satellite |
| CN105422923B (en) * | 2015-12-09 | 2017-10-10 | 西安航天动力研究所 | A kind of mechanical lock-bit self-locking one-way |
| CN106090356B (en) * | 2016-06-15 | 2018-06-08 | 湖北三江航天红林探控有限公司 | A kind of electric blasting valve for high temperature and pressure system |
| CN106678404B (en) * | 2017-03-06 | 2018-08-31 | 西安航天动力研究所 | Precipitation hits electric blasting valve |
-
2019
- 2019-11-21 CN CN201911149319.XA patent/CN110762239B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN110762239A (en) | 2020-02-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110762239B (en) | High-pressure unloading type gunpowder gas actuated valve | |
| JPWO2014097441A1 (en) | Fluid pressure cylinder | |
| CN104344017A (en) | Plane sealing type reversing valve | |
| CN112761567B (en) | Drilling and cracking integrated hole sealing device suitable for coal roadway and using method | |
| CN105689749A (en) | High-speed hydraulic chuck with centrifugal compensation function | |
| CN101709796B (en) | Two-position three-way electric explosion valve used for primary reversing system | |
| CN201037578Y (en) | Composite steel plastic pipe adapter joint | |
| CN101157144A (en) | A fluid pressure expanding type cutter chuck | |
| CN109093432B (en) | Mechanism is snatched to miniature annular part of some firearm in succession | |
| CA2605728A1 (en) | Pipe end sealing tool | |
| CN202992217U (en) | Bilateral lancing-type normally closed titanium alloy gunpowder gas actuated valve for satellite | |
| CN103032592A (en) | Satellite-used bilateral shearing-type normally-closed titanium alloy gunpowder fuel gas actuated valve | |
| CN202926749U (en) | Short-stroke precise guiding oil cylinder | |
| CN214997736U (en) | Reliably-sealed safety valve | |
| CN207112079U (en) | A kind of valve outer valve stem on-line pressure sealant fixture | |
| CN218761073U (en) | Brake of mining dump truck | |
| CN214614272U (en) | Cylinder body oil circuit structure of hydraulic breaking hammer | |
| CN217271646U (en) | Valve core assembly of main valve of hydraulic support | |
| CN110043202A (en) | A kind of centrifugation ash melting type radial piston chuck, power head and drilling machine | |
| CN113323935B (en) | Novel check valve buffer structure | |
| CN210178396U (en) | Bypass liquid return hydraulic control one-way valve | |
| CN212407575U (en) | Pneumatic opening valve | |
| CN219074911U (en) | Elastic sleeve of hydraulic knife handle | |
| CN215890863U (en) | Composite friction ring with sealing and follow-up functions | |
| TWI797920B (en) | Bellows type accumulator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |