CN214008176U - One-way valve structure and shock absorber comprising same - Google Patents
One-way valve structure and shock absorber comprising same Download PDFInfo
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- CN214008176U CN214008176U CN202022293988.9U CN202022293988U CN214008176U CN 214008176 U CN214008176 U CN 214008176U CN 202022293988 U CN202022293988 U CN 202022293988U CN 214008176 U CN214008176 U CN 214008176U
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- 230000035939 shock Effects 0.000 title claims abstract description 37
- 239000006096 absorbing agent Substances 0.000 title claims abstract description 34
- 230000006835 compression Effects 0.000 claims description 19
- 238000007906 compression Methods 0.000 claims description 19
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 230000000903 blocking effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract 2
- 230000000694 effects Effects 0.000 description 9
- 238000013016 damping Methods 0.000 description 6
- 238000009434 installation Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 4
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- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
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- 238000004080 punching Methods 0.000 description 2
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Abstract
The utility model relates to an automobile parts field specifically is a check valve structure and includes shock absorber of this check valve structure. The check valve structure comprises a valve seat, a valve core and an elastic component, wherein a through hole is formed in the center of the valve seat, the valve core comprising a resisting part and a guide part penetrates through the through hole, the guide part is positioned in the through hole, the resisting part is contacted with the outer edge of the upper part of the through hole, the spring is sleeved on the valve core, one end of the spring is fixedly connected with one end of the guide part, the other end of the spring is abutted against the valve seat, pretightening force for tightly attaching the valve seat is provided for the valve core, the spherical surface of the valve core is tightly attached to the through hole of the valve seat to realize sealing, oil cannot flow to one side of the guiding part from one side of the resisting part, when the oil flows reversely, the elastic component is compressed, the valve core is separated from the valve seat to contact with the valve seat and finishes the sealing state, so that the oil flows to one side of the resisting part from the guiding part, and realizes the function of one-way circulation.
Description
Technical Field
The utility model relates to an automobile parts field specifically is a check valve structure and includes shock absorber of this check valve structure.
Background
With the continuous development of social science and technology in recent years, the technological content of transportation tools is continuously improved, and the automobile industry is used as the most active and large-scale plate at present, so that various scientific technologies are synchronously developed, and the travel mode of people and even the life mode are continuously changed. Because the road in use at present often appears the hole condition of jolting that is difficult to perceive or can't avoid often, the vehicle can produce unexpected repeated vibration in going, produces the adverse effect to the normal work of various parts in the vehicle, can cause spare part's damage even when serious, and the passenger's that has simultaneously disturbed on the vehicle seat experience greatly of this type of vibration, can cause the injury that is difficult to predict even to the passenger when serious. Therefore, the installation of the shock absorber on the supporting part of the vehicle can not only improve the riding comfort of the vehicle, but also greatly improve the durability and the safety of the vehicle.
The commonly used one-way compression valve of the shock absorber mainly comprises: the device comprises a compression valve rod, an adjusting gasket, a compression valve plate, a compression throttle valve plate, a compression valve seat, a compensation valve plate, a compensation spring and a nut. The shock absorber check valve of this structure part is more, still need through spin-on rivet or punching rivet locking after each part equipment, and the complicated flow of technology is loaded down with trivial details. Meanwhile, a plurality of factors influencing the consistency of the damping force exist in the structure, such as the rigidity of a valve plate and a spring, the internal structure of a powder piece compression valve seat, the size and the position of a hole, the flatness control of an oil surface line, the processing precision of a compression valve rod and a nut, the control of the torsion and the punching and riveting force during the locking of the nut and the like.
Also disclosed in patent application No. CN201811184239 is a check valve, which includes a valve body and a valve core assembly disposed in the valve body. The valve body is provided with an oil inlet, an oil outlet and a valve cavity communicated with the oil inlet and the oil outlet, the valve cavity comprises an oil inlet cavity, a connecting cavity and an oil outlet cavity which are sequentially communicated, a raised limiting boss is arranged on the side wall of the oil outlet cavity, and the step is in an arc curved surface; the valve core assembly comprises a valve rod, a spring seat, a valve rod spring and a baffle clamp; the valve rod comprises a rod body and a conical flaring limiting part formed at one end of the rod body, the rod body penetrates through the connecting cavity and the oil inlet cavity, and the flaring limiting part is matched with the limiting boss; the other end of the rod body is sleeved with the spring seat and is located in the oil inlet cavity. The valve rod spring is fixed in the spring holder and holds between the tip that is close to connecting chamber one side in spring holder and oil feed chamber, and the spring holder supports tight valve rod spring, and the separation blade clamp sets up in the outside of spring holder. The spring in the check valve structure directly cup joints on the cylindrical pipe wall of oil feed one side, very easily makes spring or valve body take place wearing and tearing in reciprocating motion relapse, and then influences the size of pretightning force and leads to the valve rod reset untimely lead to the fact the relatively poor setting of one-way conduction effect to be unable normal one-way conduction function of realization. The check valve comprises more parts, and replacement and maintenance operations are complex when a single part is damaged, so that the workload is increased.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a simple structure is reliable durable check valve structure and includes the shock absorber of this check valve structure.
The above technical purpose of the present invention can be achieved by the following technical solutions:
the utility model provides a check valve structure, includes case, disk seat and spring, its characterized in that: the center of the valve seat is provided with a through hole extending along the axial direction of the valve seat, and the valve core comprises a butting part for plugging the through hole and a guide part which passes through the through hole and controls and guides the movement direction of the valve core; the spring is sleeved on the guide part, one end of the spring is fixed on one side, close to the lower side, of the guide part, and the other end of the spring is abutted and fixed with the lower end face of the valve seat.
Preferably, the guide portion has a fixing groove formed on a lower side thereof, and the lower end of the spring is coupled and fixed to the inside of the fixing groove.
Preferably, the end of the guide portion of the valve body includes a tapered block.
Preferably, the valve element is made of an aluminum material and the surface thereof is subjected to hard oxidation treatment.
A shock absorber comprises any one-way valve structure.
As a preference to the present invention, the shock absorber further includes an inner cylinder connected to the check valve structure to form a first cavity, an outer cylinder for accommodating internal components and forming a second cavity, and a piston rod for extruding internal oil, the inner cylinder is sleeved on the upper portion of the check valve structure, the inner cylinder and the check valve structure are jointly installed in the outer cylinder, the piston rod enters the second cavity from a side away from the check valve structure, the piston rod can reciprocate in the second cavity, meanwhile, the end of the piston rod is attached to the inner wall of the inner cylinder and divides the second cavity into a compression cavity and a compensation cavity, and the compensation cavity is communicated with the second cavity at the upper portion of the inner cylinder; the first cavity and the second cavity are isolated from the outside and are filled with oil.
As to the utility model discloses a preferred, the bottom of the outer cylinder body be provided with be used for with the valve body offsets the face of leaning on, the bottom of disk seat be one kind with lean on the corresponding installation face of face.
As right the utility model discloses a preferred, the case relative position in the inside bottom surface of outer cylinder body and the check valve structure has seted up the groove of dodging of undercut.
As right the utility model discloses a preferably, it is used for preventing that the idle stroke from appearing reducing simultaneously the gasbag that cavity what bubble produced in the fluid to describe fixedly between outer cylinder body and the inner cylinder body.
As right the utility model discloses a preferred, the downside of cylinder body is offered and is used for assisting the compensation mouth of the timely circulation of fluid.
To sum up, the utility model discloses following a plurality of beneficial effect can be realized:
1. the check valve structure only comprises a valve seat, a valve core and a spring, is simple in structure and convenient to install, and is convenient to replace and maintain when parts are seriously abraded or damaged.
2. One end of a spring in the one-way valve structure is fixedly arranged in a fixed groove at the tail end of the valve core, the other end of the spring is abutted against the lower end face of the valve seat, the spring is not in contact with the valve core and the valve seat except the abutting face, friction is not generated between the spring and other parts in the axial reciprocating motion of the valve core, the abrasion of the spring in the using process is reduced, the size consistency of the pretightening force of the spring is effectively ensured, and the one-way valve can be timely closed and can block the through hole after finishing the one-way conduction work.
3. The end of the valve core of the one-way valve structure comprises a conical block, the conical block is in a shape with a large upper part and a small lower part, and a spring is conveniently sleeved on the valve core from one side of the conical block through extrusion and is clamped and embedded in the fixing groove during installation.
4. The part of support of case among the check valve structure is a spherical surface by the downside, when the case carries out reciprocating motion along the perforating hole axial, can take place to deflect in certain angle within range, and spherical surface structure can realize self and the terminal surface of perforating hole and closely laminate the contact all the time this moment, guarantees the stability of sealed effect when the check valve structure closes.
5. The through hole edge in the check valve structure is provided with a fillet, and the circular arc surface on the fillet is matched with the spherical surface of the abutting part to abut against the spherical surface, so that the valve core is matched with the valve seat more tightly in the reciprocating motion, the abrasion effect generated by collision can be reduced, and the blocking effect of oil liquid received when flowing through the through hole is reduced.
6. The valve core in the one-way valve structure is made of aluminum materials and subjected to hard oxidation treatment on the surface, so that various performances of the valve core, such as corrosion resistance, wear resistance, weather resistance, insulativity and the like, can be effectively improved, the durability of the one-way valve structure is greatly improved, and the service life of the one-way valve structure is prolonged.
7. The shock absorber comprises the one-way valve structure, a conical abutting surface is arranged at the bottom of an outer cylinder body of the shock absorber, and the lower end surface of the valve seat is a conical mounting surface corresponding to the abutting surface; during the assembly, the lower end face of the valve seat is directly attached to abut against the abutting face of the bottom of the outer cylinder body, the installation can be directly positioned, the through hole in the valve seat is aligned with the central line of the cylinder body, the installation and positioning process is more convenient, and meanwhile, the consistency of the size and the position during batch manufacturing can be guaranteed.
8. Because the valve core can generate certain abrasion in the repeated movement, the whole valve core moves downwards, the guide end part of the valve core moves downwards and is easy to abut against the outer cylinder body, the one-way valve structure cannot be closed, and the vibration reduction effect of the vibration reducer is lost, the bottom of the outer cylinder body of the vibration reducer is provided with an avoiding groove which is opposite to the valve core and is sunken downwards, and the situation is prevented.
9. An air bag is fixedly arranged between the inner cylinder body and the outer cylinder body, and the air bag can prevent the generation of idle stroke and reduce the generation of cavities when the shock absorber works.
10. The lower side of the cylinder body is provided with the compensation port, more oil in the second cavity can timely move to the lower end of the valve body and enter the first cavity through the through hole when the shock absorber stretches, and the situation that the shock absorption effect is reduced due to the fact that the oil in the first cavity is insufficient is prevented.
Drawings
FIG. 1 is a schematic view of a check valve;
FIG. 2 is a schematic view of a valve cartridge;
FIG. 3 is a schematic view of a valve seat structure;
fig. 4 is a schematic view of the internal structure of the shock absorber.
In the figure:
1-one-way valve structure;
2-valve core, 2 a-resisting part, 2 b-guiding part, 2 c-fixing groove, 2 d-conical block;
3-valve seat, 3 a-through hole, 3 b-compensation opening, 3 c-concave part;
4-a spring;
5-inner cylinder, 5 a-first cavity;
6-external cylinder body, 6 a-second cavity;
7-a piston rod;
8-a compression chamber;
9-compensation chamber;
10-avoidance groove;
11-air bag;
12-vibration damper.
Detailed Description
The following specific embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can make modifications of the present embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent laws and protection within the scope of the present invention.
The scheme is realized by the following technical means:
example 1: a check valve structure 1 comprises a valve core 2, a valve seat 3 and a spring 4, wherein the main body of the valve seat 3 is cylindrical, a plurality of sections of concave parts which are concave towards opposite sides are formed on the end surfaces of two sides of the valve seat 3, and a through hole 3a which extends along the axial direction of the main body of the valve seat 3 is formed in the center of the valve seat 3; one end of the valve core 2 is a supporting part 2a with a radial size larger than that of the through hole 3a, the lower side part of the supporting part 2a is spherical, the other end of the valve core 2 is a guide part 2b with a radial size smaller than that of the through hole 3a, and the tail end of the guide part 2b is provided with a fixing groove 2c, specifically an annular inner groove sunken to the center of the guide part 2 b. When the check valve structure 1 is installed, the guide part 2b of the valve core 2 firstly penetrates through the through hole 3a of the valve seat 3, then the spring 4 is sleeved on the guide part 2b from the tail end of the guide part 2b, one end of the spring 4 is clamped and embedded in the annular inner groove, at the moment, the other end of the spring 4 abuts against the end face of the inner concave part 3c of the valve seat 3, and the position of the end part of the spring 4 is limited by the inner concave part 3 c. In the initial state, the biasing force of the spring 4 causes the abutting portion 2a of the valve element to be closely attached to the through hole 3 a.
It is further preferable that the shape of the valve seat 3 is such that the inner recess 3c has a truncated cone shape in which the radial dimension gradually decreases from the end surface toward the other end, and the inner recess 3c is formed with an inclined surface along which the spring 4 can be returned to the abutting position without additional fixing connection when the spring 4 slightly shifts in the reciprocating motion against the end surface of the inner recess 3 c. It is further preferable that the radial dimension of the concave portion 3c corresponds to the radial dimension of the spring 4, and at this time, the end portion of the spring 4 is tightly fitted into the concave portion 3c, so that the spring can be further prevented from shaking off. The valve seat 3 is provided with a fillet at the edge of the through hole 3a, the fillet can effectively reduce the impact wear effect between the valve core 2 and the valve seat 3 in repeated reciprocating motion, and simultaneously reduce the resistance of oil when the oil flows through the through hole 3a, so that the valve seat 3 can be opened and reset more quickly.
The shape of the valve core 2 is further optimized, the tail end of the guide part of the valve core 2 comprises a conical block 2d which gradually expands the radial dimension from the end surface along the axial direction, and when the spring 4 is installed, the spring 4 gradually expands from the small end of the conical block 2d until the spring 4 is completely sleeved on the guide part 2b, so that the spring 4 is more quickly positioned and more conveniently operated when being installed. The valve core 2 is made of aluminum materials, the surface of the valve core 2 is subjected to hard oxidation treatment, and an oxidation film with high hardness, high temperature resistance, wear resistance and corrosion resistance is formed on the surface of the valve core 2, so that the deformation and wear degree of the valve core 2 under repeated contact and collision with the valve seat 3 are effectively reduced, and the durability of the check valve structure 1 is greatly improved.
Example 2: the shock absorber 12 comprises the unidirectional shock absorbing structure 1 and further comprises an inner cylinder body 5, an outer cylinder body 6 and a piston rod 7. The inner cylinder body 5 is fixedly sleeved on the upper part of the unidirectional vibration damping structure 1, and the inner cylinder body 5 and the unidirectional vibration damping structure 1 are jointly surrounded to form a first cavity 5 a; the unidirectional vibration damping structure and the inner cylinder body 5 are installed in the outer cylinder body 6, and a second cavity 6a is formed between the inner cylinder body 5 and the outer cylinder body 6; the end part of the piston rod 7 sequentially penetrates through the outer cylinder body and the inner cylinder body from the upper side of the shock absorber 12 and then enters the first cavity, the radial size of the end part of the piston rod corresponds to the inner radial size and shape of the inner cylinder body, the side wall of the end part is attached to the inner wall of the inner cylinder body 5, the piston rod 7 can reciprocate in the first cavity 5a along the axial direction of the first cavity 5a, the first cavity 5a is further divided into a compression cavity 8 and a compensation cavity 9 by the end part of the piston rod 7, and the compensation cavity 9 and the second cavity 6a are communicated with each other above the shock absorber 12; the first cavity 5a and the second cavity 6a are filled with oil and isolated from the external space.
In an initial state, the one-way vibration reduction structure 1 enables the valve core 2 to abut against the valve seat 3 under the action of the pre-tightening force of the internal spring 4, and at the moment, the one-way valve structure 1 is closed; when the shock absorber 12 is compressed, the end of the piston rod 7 approaches the valve seat 3 and presses the oil in the compression chamber 8, at this time, the oil in the compression chamber 8 cannot flow to the second cavity 6a through the through hole 3a in the one-way vibration damping structure 1 and only slowly flows to the compensation chamber 9 through the gap between the end of the piston rod 7 and the inner wall of the inner cylinder 5, and the oil in the compression chamber 8 rapidly rises in internal pressure under the pressing action of the piston rod 7 and generates a great damping effect to resist the further compression stroke of the shock absorber 12. When the shock absorber 12 is stretched, the end of the piston rod 7 is far away from the valve seat 3, and then the space of the compression cavity 8 is gradually enlarged, so that the oil pressure in the compression cavity 8 is smaller than the oil pressure in the second cavity 6a, at this time, the acting force of the oil in the second cavity 6a on the valve core 2 overcomes the pretightening force of the spring 4 to open the check valve structure 1, the oil in the second cavity 6a flows to the compression cavity 8 through the through hole on the valve seat 3, and meanwhile, the oil in the compensation cavity 9 flows to the second cavity 6a from the upper communication part, so that the shock absorber 12 receives a smaller blocking acting force during the stretching stroke, and the effect of unidirectional shock absorption is realized.
On the basis of the above embodiment, the shapes of the valve seat 3 and the outer cylinder 6 are optimized, the bottom of the outer cylinder 6a is provided with a concave part which is concave downwards, the concave part forms a conical space with a large top and a small bottom in the second cavity, and an abutting surface for being attached to the valve seat is formed in the concave part; the valve seat comprises a mounting surface corresponding to the shape of the abutting surface. The structure can facilitate the positioning and enable the centers of the check valve structure and the outer cylinder body to be on the same axis when the check valve structure is installed on the outer cylinder body in a matched mode.
Meanwhile, a hemispherical avoiding groove 10 which is sunken downwards is formed in the center of the inner bottom surface of the outer cylinder body 6a, after the valve core 2 repeatedly reciprocates and collides with the valve seat 3 to be worn, the valve core 2 cannot be prevented from moving downwards along the axial direction of the through hole 3a, the avoiding groove 10 can prevent the valve core 2 from contacting with the bottom of the outer cylinder body 6 after moving downwards, and the condition that the one-way valve structure 1 in the shock absorber 12 fails is avoided. The lower side of the valve seat 3 is further provided with a semicircular compensation port 3b, and the compensation port 3b can enable oil in the second cavity 6a to flow more quickly during the stretching stroke of the shock absorber 12 and timely enter the compression cavity 8 through the through hole 3a, so that the stability of the shock absorber 12 in continuous operation is ensured. An air bag 11 is further arranged between the inner cylinder 5 and the outer cylinder 6, the air bag 11 can contract or expand along with the change of oil pressure, cavities or air bubbles generated in the use process of the shock absorber 12 can be effectively reduced, the impact of the cavities or the air bubbles on the shock absorber 12 is relieved, and meanwhile, the noise generated by the cavity or the air bubble breakage in the use process is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope of the present invention, and these modifications or replacements should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a check valve structure, includes case, disk seat and spring, its characterized in that: the center of the valve seat is provided with a through hole extending along the axial direction of the valve seat, and the valve core comprises a stop part for blocking the through hole and a guide part which passes through the through hole and limits the movement direction of the valve core; the spring is sleeved on the guide part, one end of the spring is fixed on one side, close to the lower side, of the guide part, and the other end of the spring is abutted and fixed with the lower end face of the valve seat.
2. The one-way valve structure of claim 1, wherein: the guide part is provided with a fixing groove close to the lower side, and the lower end of the spring is sleeved and fixed inside the fixing groove.
3. The one-way valve structure of claim 1, wherein: the tail end of the guide part of the valve core comprises a conical block.
4. The one-way valve structure of claim 1, wherein: the valve core is made of aluminum material and the surface of the valve core is subjected to hard oxidation treatment.
5. A shock absorber, characterized by: the damper includes the check valve structure of any one of claims 1-4.
6. The shock absorber according to claim 5, wherein: the shock absorber further comprises an inner cylinder body connected with the one-way valve structure to form a first cavity, an outer cylinder body used for containing internal components and forming a second cavity, and a piston rod used for extruding internal oil, wherein the inner cylinder body is sleeved on the upper portion of the one-way valve structure, the inner cylinder body and the one-way valve structure are jointly installed in the outer cylinder body, the piston rod enters the second cavity from one side far away from the one-way valve structure, the piston rod can reciprocate in the second cavity, meanwhile, the end portion of the piston rod is attached to the inner wall of the inner cylinder body and divides the second cavity into a compression cavity and a compensation cavity, and the compensation cavity is communicated with the second cavity at the upper portion of the inner cylinder body; the first cavity and the second cavity are isolated from the outside and are filled with oil.
7. The shock absorber according to claim 6, wherein: the bottom of the outer cylinder body is provided with a leaning surface which is used for leaning against the valve seat, and the bottom of the valve seat is a mounting surface which corresponds to the leaning surface.
8. The shock absorber according to claim 6, wherein: and a downward sunken avoidance groove is formed in the position, opposite to the valve core in the one-way valve structure, of the bottom surface in the outer cylinder body.
9. The shock absorber according to claim 6, wherein: an air bag used for preventing the occurrence of idle stroke and reducing the generation of cavities in oil is fixedly arranged between the outer cylinder body and the inner cylinder body.
10. The shock absorber according to claim 6, wherein: the downside of cylinder body is seted up and is used for assisting the timely compensation mouth that circulates of fluid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022293988.9U CN214008176U (en) | 2020-10-15 | 2020-10-15 | One-way valve structure and shock absorber comprising same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022293988.9U CN214008176U (en) | 2020-10-15 | 2020-10-15 | One-way valve structure and shock absorber comprising same |
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| CN214008176U true CN214008176U (en) | 2021-08-20 |
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| CN202022293988.9U Active CN214008176U (en) | 2020-10-15 | 2020-10-15 | One-way valve structure and shock absorber comprising same |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738807A (en) * | 2021-09-28 | 2021-12-03 | 浙江路得坦摩汽车部件股份有限公司 | Pressure slow-drop check valve for vibration damper |
| CN116734038A (en) * | 2023-08-16 | 2023-09-12 | 石家庄先楚核能装备股份有限公司 | Butterfly valve with self-cleaning system and assembling method |
| EP4450846A1 (en) * | 2023-04-17 | 2024-10-23 | DRiV Automotive Inc. | Damper with base line valve |
-
2020
- 2020-10-15 CN CN202022293988.9U patent/CN214008176U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113738807A (en) * | 2021-09-28 | 2021-12-03 | 浙江路得坦摩汽车部件股份有限公司 | Pressure slow-drop check valve for vibration damper |
| EP4450846A1 (en) * | 2023-04-17 | 2024-10-23 | DRiV Automotive Inc. | Damper with base line valve |
| US12442430B2 (en) | 2023-04-17 | 2025-10-14 | Advanced Suspension Technology Llc | Damper with base line valve |
| CN116734038A (en) * | 2023-08-16 | 2023-09-12 | 石家庄先楚核能装备股份有限公司 | Butterfly valve with self-cleaning system and assembling method |
| CN116734038B (en) * | 2023-08-16 | 2023-10-31 | 石家庄先楚核能装备股份有限公司 | Butterfly valve with self-cleaning system and assembling method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant |