CN216200755U - Ash and slag discharging ball valve - Google Patents
Ash and slag discharging ball valve Download PDFInfo
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- CN216200755U CN216200755U CN202122514504.3U CN202122514504U CN216200755U CN 216200755 U CN216200755 U CN 216200755U CN 202122514504 U CN202122514504 U CN 202122514504U CN 216200755 U CN216200755 U CN 216200755U
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Abstract
The utility model discloses an ash and slag discharging ball valve, which comprises: the valve body is internally provided with a valve cavity, and a medium inflow passage and a medium outflow passage which are communicated with the valve cavity; the ball body is arranged in the valve cavity and is provided with a first through hole; the upstream valve seat and the downstream valve seat are respectively arranged between two sides of the ball body and the wall of the valve cavity; the upstream valve seat is provided with a second through hole, one end of the upstream valve seat is communicated with the medium inflow channel, and the other end of the upstream valve seat corresponds to the first through hole; the downstream valve seat is provided with a third through hole, one end of the downstream valve seat is communicated with the medium outflow channel, and the other end of the downstream valve seat corresponds to the first through hole; the medium inflow channel, the second through hole, the first through hole, the third through hole and the medium outflow channel are matched to form a medium flow channel; one end of the valve rod is connected with the ball body, and the other end of the valve rod penetrates through a valve rod channel on the valve body and extends out of the valve body; the ball body is respectively connected with the upstream valve seat and the downstream valve seat in a rotating way, and the valve rod is used for driving the ball body to rotate so as to open or close the medium flow passage; the downstream valve seat is provided with an ash guide groove which is communicated with the valve cavity and the medium outflow passage.
Description
Technical Field
The utility model belongs to the field of control ball valves, and particularly relates to an ash and slag discharging ball valve.
Background
At present, many chemical process media are not clean and contain dust, powder, slag and other powder or solid particles, and the powder or solid particle media are accumulated in a valve cavity in the valve opening and closing process, so that the valve is blocked or difficult to open and close after the powder or solid particle media are accumulated to a certain degree.
The valve used in the working condition that the medium contains dust, powder, slag and other powder or solid particles is generally a double-valve-seat ball valve or a single-valve-seat ball valve. The double-valve-seat ball valve has good sealing performance and even stress, but dust or solid particle media in the valve cavity cannot be discharged, and the valve is blocked or difficult to open when the dust or solid particle media are accumulated to a certain degree. The single-valve-seat ball valve can smoothly discharge dust or solid particle media in the valve cavity, but due to the single valve seat, the ball body is stressed unevenly, the valve leakage grade is low, unidirectional stress is caused, the ball body and the valve rod are abraded unidirectionally, and the service life of the valve is not long.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an ash and slag discharging ball valve, which aims to solve the technical problem that in the prior art, dust or solid particle media are easily accumulated in a valve cavity of a double-valve-seat ball valve to block the valve.
The technical scheme of the utility model is as follows:
an ash and slag discharging ball valve comprising:
the valve comprises a valve body, a valve body and a valve body, wherein the valve body is internally provided with a valve cavity and a medium inflow passage and a medium outflow passage which are communicated with the valve cavity;
the ball body is arranged in the valve cavity, and a first through hole is formed in the ball body;
the upstream valve seat and the downstream valve seat are respectively arranged between two sides of the ball body and the wall of the valve cavity; the upstream valve seat is provided with a second through hole, one end of the second through hole is communicated with the medium inflow channel, and the other end of the second through hole corresponds to the first through hole; the downstream valve seat is provided with a third through hole, one end of the downstream valve seat is communicated with the medium outflow channel, and the other end of the downstream valve seat corresponds to the first through hole; the medium inflow channel, the second through hole, the first through hole, the third through hole and the medium outflow channel are matched to form a medium flow channel;
the valve body is provided with a valve rod passage communicated with the valve cavity, one end of the valve rod is connected with the ball body, and the other end of the valve rod penetrates through the valve rod passage and extends out of the valve body; the ball is respectively and rotatably connected with the upstream valve seat and the downstream valve seat, and the valve rod is used for driving the ball to rotate so as to open or close the medium flow passage;
and the downstream valve seat is provided with an ash guide groove which is communicated with the valve cavity and the medium outflow passage.
Preferably, the downstream valve seat comprises a downstream valve seat body and a valve seat support body, the third through hole is formed in the valve seat support body, the downstream valve seat body is connected with the ball body and the valve seat support body respectively, the outer side wall of the valve seat support body is connected with the wall of the valve cavity, and part of the outer side wall of the valve seat support body is recessed and matched with the wall of the valve cavity to form the ash guide groove.
Preferably, the dust guide device comprises a plurality of dust guide grooves which are uniformly distributed around the axis of the third through hole.
Preferably, the valve body is provided with a purge hole communicated with the valve cavity, and a purge hole plug is installed in the purge hole.
Preferably, at least one of the positions between the upstream valve seat and the valve cavity wall and between the downstream valve seat body and the valve seat support is provided with an annular sealing structure, wherein the upstream valve seat and the downstream valve seat are first sealed pieces, and the valve cavity wall and the valve seat support are second sealed pieces;
the annular sealing structure comprises a butterfly spring and two sealing rings, the two sealing rings are respectively connected with the first sealed piece and the second sealed piece to realize the sealing connection of the first sealed piece and the second sealed piece, the butterfly spring is wound on the periphery of the second through hole, and two axial ends of the butterfly spring are respectively connected with the two sealing rings.
Preferably, a sealing pressure pad is arranged between the belleville spring and the sealing ring.
Preferably, the surface of the belleville spring facing the ball is connected with the corresponding sealing pressure pad near the outer side wall thereof, and the surface of the belleville spring facing away from the ball is connected with the corresponding sealing pressure pad near the inner side wall thereof.
Preferably, the surface of the first sealed piece and the surface of the second sealed piece cooperate to form a spring cavity for accommodating an annular sealing structure;
the spring cavity comprises a main cavity and two side cavities which are communicated with each other, the belleville spring is arranged in the main cavity, the sealing ring and the sealing pressure pad which are positioned on the same side of the belleville spring are accommodated in the same side cavity, the sealing ring is pressed in the side cavity by the corresponding sealing pressure pad, and the part of the sealing pressure pad extends out of the side cavity and is connected with the belleville spring.
Preferably, the valve body comprises an upstream valve body and a downstream valve body, the upstream valve body and the downstream valve body are fixedly connected and are internally assembled to form a valve cavity, the upstream valve seat is connected with the upstream valve body, and the downstream valve seat is connected with the downstream valve body; the valve stem passage is disposed on the upstream valve body.
Preferably, the valve further comprises a lower valve rod, one end of the lower valve rod is rotatably connected with the ball body, the rotating axis of the lower valve rod and the rotating axis of the ball body are located on the same straight line, and the other end of the lower valve rod is fixedly connected with the valve body.
Due to the adoption of the technical scheme, compared with the prior art, the utility model has the following advantages and positive effects:
(1) the ash and slag discharging ball valve provided by the utility model is a double-valve-seat ball valve, and the downstream valve seat is provided with an ash guide groove for communicating the valve cavity with the medium outflow channel, so that dust or solid particle media accumulated in the valve cavity can be smoothly discharged to the downstream position, and the problem that the valve is blocked due to the fact that the dust or solid particle media are easily accumulated in the valve cavity of the double-valve-seat ball valve is solved.
(2) In the ash and slag discharging ball valve provided by the embodiment of the utility model, the valve body is provided with the purge hole communicated with the valve cavity, and the purge hole is internally provided with the purge hole plug. When the valve is closed, the blow-off hole plug can be opened, and the powder or solid particle media accumulated in the valve cavity are blown off by external high-pressure gas and discharged from the media outflow channel, so that the valve cavity is cleaned, and the valve is prevented from being locked or difficult to open and close.
(3) The ash and slag discharging ball valve provided by the embodiment of the utility model is provided with the annular sealing structures with the belleville springs on the upstream valve seat and the downstream valve seat, and the belleville spring on the upstream valve seat and the belleville spring on the downstream valve seat have the same output force, so that the bidirectional stress of the ball body and the valve rod is uniform, the sealing grade of the valve is improved, and the service life of the valve is prolonged.
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 utility model.
FIG. 1 is a schematic structural view of an ash and slag discharging ball valve according to the present invention;
FIG. 2 is a schematic view of a valve seat support according to the present invention;
FIG. 3 is a schematic structural view of an annular seal structure of the present invention;
FIG. 4 is a schematic structural view of an ash and slag discharging ball valve with a purge hole according to the present invention.
Description of reference numerals:
1: an upstream valve body; 2: a downstream valve body; 3: an upstream valve seat; 4: a downstream valve seat body; 5: a valve seat support; 6: a sphere; 7: a valve stem; 8: a lower valve stem; 9: a stuffing box; 10: a support; 11: a dust guide groove; 12: a blowing hole plug; 13: a belleville spring; 14: sealing the pressure pad; 15: and (5) sealing rings.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following description will be made with reference to the accompanying drawings. It is obvious that the drawings in the following description are only some examples of the utility model, and that for a person skilled in the art, other drawings and embodiments can be derived from them without inventive effort.
For the sake of simplicity, the drawings only schematically show the parts relevant to the present invention, and they do not represent the actual structure as a product. In addition, in order to make the drawings concise and understandable, components having the same structure or function in some of the drawings are only schematically illustrated or only labeled. In this document, "one" means not only "only one" but also a case of "more than one".
Example 1
Referring to fig. 1 to 4, the present embodiment provides an ash and slag discharging ball valve, including: valve body, ball 6, upstream valve seat 3, downstream valve seat and valve stem 7. The valve body is provided with a valve cavity and a medium inflow passage and a medium outflow passage which are communicated with the valve cavity. The ball body 6 is arranged in the valve cavity, and a first through hole is arranged on the ball body 6. The upstream 3 and downstream seats are respectively provided between the sides of the ball 6 and the chamber wall. The upstream valve seat 3 has a second through hole, one end of which is communicated with the medium inflow channel, and the other end of which corresponds to the first through hole. The downstream valve seat is provided with a third through hole, one end of the third through hole is communicated with the medium outflow channel, and the other end of the third through hole corresponds to the first through hole. The medium inflow channel, the second through hole, the first through hole, the third through hole and the medium outflow channel are matched to form a medium flow channel. The valve body is provided with a valve rod 7 channel communicated with the valve cavity, one end of the valve rod 7 is connected with the ball body 6, and the other end of the valve rod 7 channel penetrates through and extends out of the valve body. The ball 6 is rotatably connected with the upstream valve seat 3 and the downstream valve seat respectively, and the valve rod 7 is used for driving the ball 6 to rotate so as to open or close the medium flow passage.
Wherein, the downstream valve seat is provided with an ash guide groove 11, and the ash guide groove 11 is communicated with the valve cavity and the medium outflow passage. The dust guide groove 11 can smoothly discharge dust or solid particle media accumulated in the valve cavity to the downstream position, so that the problem that the valve is blocked due to the fact that the dust or solid particle media are easily accumulated in the valve cavity of the double-valve-seat ball valve is solved.
The structure of the present embodiment will now be explained.
The ash and slag discharging ball valve provided by the embodiment further comprises a stuffing box 9 and a support 10, and the valve body comprises an upstream valve body 1 and a downstream valve body 2. The upstream valve body 1 and the downstream valve body 2 are fixedly connected and are internally matched to form a valve cavity, the upstream valve seat 3 is connected with the upstream valve body 1, and the downstream valve seat is connected with the downstream valve body 2; the valve rod 7 is arranged on the upstream valve body 1 in a channel manner. The stuffing box 9 is connected on the upstream valve body 1, the support 10 is connected on the stuffing box 9, the valve rod 7 stretches out through the 7 passageways of valve rod after the valve body wears to establish in proper order again and stretches out after stuffing box 9 and support 10, the mountable is convenient for rotate the handle of valve rod 7 after the valve rod 7 stretches out, conveniently to opening or close row's ash sediment ball valve of arranging, or valve rod 7 joinable is on pneumatic or electric actuator such as cylinder to the pneumatic or electric control of row's ash sediment ball valve is arranged in the realization.
The embodiment further can also include lower valve rod 8, sets up 8 passageways of lower valve rod on the valve body 1 of upstream, and 8 one ends of lower valve rod are connected with spheroid 6 is rotated, and its axis of rotation and spheroid 6's axis of rotation are located same straight line, and the other end passes through the valve pocket and holds in 8 passageways of lower valve rod and with upstream valve body 1 fixed connection to stabilize spheroid 6's rotation.
Referring to fig. 1, the ash and slag discharging ball valve provided in this embodiment adopts a fixed ball valve structure, and if the fixed ball valve structure is replaced by a floating ball valve structure, the other structures are kept unchanged, so that the purpose of the present invention can be achieved.
The downstream valve seat in this embodiment includes downstream valve seat body 4 and valve seat support, and third through hole and ash guide groove 11 all set up on the valve seat support, and the valve seat support lateral wall is connected with the valve cavity wall, and valve seat support part lateral wall indent forms ash guide groove 11 with the cooperation of valve cavity wall. Although the downstream valve seat in this embodiment includes the downstream valve seat body 4 and the valve seat support, in other embodiments, the downstream valve seat may be a single body or may be in other arrangements, which are not limited herein.
One or more dust guide grooves 11 can be provided, and when a plurality of dust guide grooves 11 are provided, the plurality of dust guide grooves 11 can be further uniformly distributed around the axis of the third through hole. In the present embodiment, three ash guiding grooves 11 are uniformly distributed around the axis of the third through hole, but the number and arrangement of the ash guiding grooves 11 are not limited in other embodiments.
An annular sealing structure is provided at least one of between the upstream valve seat 3 and the valve chamber wall, and between the downstream valve seat body 4 and the valve seat support 5. For convenience of description, the upstream valve seat 3 and the downstream valve seat are collectively referred to as a first sealed member, and the valve cavity wall and the valve seat support 5 are collectively referred to as a second sealed member.
The annular sealing structure comprises a belleville spring 13 and two sealing rings 15, wherein the two sealing rings 15 are respectively connected with a first sealed piece and a second sealed piece, namely, each sealing ring 15 is simultaneously connected with the first sealed piece and the second sealed piece, so that the sealing connection between the first sealed piece and the second sealed piece is realized. The belleville spring 13 is wound on the periphery of the second through hole, and two axial ends of the belleville spring 13 are respectively connected with the two sealing rings 15.
Further, a seal pressure pad 14 may be provided between the disc spring 13 and the seal ring 15. The surface of the belleville spring 13 facing the ball 6 is connected, close to its outer side wall, in contact with a corresponding sealing pressure pad 14, which sealing pressure pad 14 is then connected to a sealing ring 15 on that side; the surface of the belleville spring 13 remote from the ball 6 is connected close to its inner side wall at a corresponding sealing pressure pad 14, which sealing pressure pad 14 is then connected with a sealing ring 15 on that side.
The surfaces of the first sealed piece and the second sealed piece at the annular sealing structure are in a step shape, and the surfaces of the first sealed piece and the second sealed piece are matched with each other to form a spring cavity for accommodating the annular sealing structure. The spring cavity comprises a main cavity mainly used for placing the belleville spring 13 and two side cavities mainly used for containing a sealing ring 15 and a sealing pressure pad 14, and the sealing ring 15 and the sealing pressure pad 14 which are positioned on the same side of the belleville spring 13 are contained in the same side cavity. Two sides of the belleville spring 13 respectively abut against the two sealing pressure pads 14, then the two sealing pressure pads 14 respectively abut against the two sealing rings 15 on the inner wall of the bottom of the side cavity, namely the whole sealing ring 15 is pressed in the side cavity by the corresponding sealing pressure pad 14, and the sealing pressure pad 14 partially extends out of the side cavity to be connected with the belleville spring 13.
In the embodiment, an upstream and downstream double-valve-seat structure is adopted, and the belleville spring 13 at the upstream valve seat 3 and the belleville spring 13 at the downstream valve seat have the same output force, so that the bidirectional stress of the ball body 6 and the valve rod 7 is uniform, the sealing grade of the valve is improved, and the service life of the valve is prolonged. And a spring cavity full protection structure is adopted, the two sides of the belleville spring 13 are provided with a sealing ring 15 and a sealing pressure pad 14 (see figure 3), and the spring force acts on the sealing pressure pad 14 to press the sealing ring 15, so that the situation that the belleville spring 13 fails to work due to the fact that powder or solid particle media enter the spring cavity and valve leakage is caused is prevented.
The cylinder or the handle drives the valve rod 7 and the ball body 6 to rotate, so that the first through hole is not communicated with the second through hole and the third through hole, and the valve is closed; the cylinder or the handle drives the valve rod 7 and the ball body 6 to rotate, so that the first through hole is communicated with the second through hole and the third through hole, and the valve is opened. During the closing and opening of the valve (when the valve is half-opened or partially opened), the medium pressure in the medium flow passage blows the residual accumulated dust or solid particle medium in the valve cavity into the medium outflow passage through the dust guide groove 11 (see fig. 2) at the downstream valve seat, thereby avoiding the accumulation of the dust or solid particle medium in the valve cavity.
This embodiment adopts and adopts the ball valve structure of sealed firmly, if change for the ball valve structure of soft seal, other remain unchanged, also can solve two disk seat ball valve intracavity and accumulate dust class or solid particle class medium easily and make the dead problem of valve card.
Example 2
Referring to fig. 4, in this embodiment, a purge hole and a purge hole plug 13 are added on the basis of embodiment 1.
The purge hole sets up on the valve body, and intercommunication valve pocket and external world install purge hole end cap 13 in the purge hole, and the purge hole can be seted up respectively to the both sides at valve body valve pocket middle part specifically in this embodiment, and of course in other embodiments the purge hole can be selected according to actual conditions with quantity and the position of setting, and here does not do the restriction.
When the residual accumulated dust or solid particle media in the valve cavity cannot be cleaned up only by the media pressure in the media flow passage in the closing and opening processes of the valve, the blowing hole plug 13 can be opened when the valve is closed (namely no media pressure exists in the valve cavity), the powder or solid particle media accumulated in the valve cavity are blown by external high-pressure gas, and the powder or solid particle media are discharged to the media outflow passage through the ash guide groove 11 (see fig. 2) in the downstream valve seat, so that the valve cavity is further cleaned, and the valve is prevented from being jammed or difficult to open and close.
The ash and slag discharging ball valve provided by the utility model adopts a double-valve seat structure, is uniform in stress, good in valve sealing performance, high in leakage level, uniform in stress of the ball body 6 and the valve rod 7, small in abrasion and long in service life. The utility model creatively designs a valve seat support body and an ash guide groove 11 at the downstream valve seat, and dust or solid particle media accumulated in the valve cavity can be smoothly discharged from a media outflow channel through the ash guide groove 11. And the two sides of the middle part of the valve cavity of the valve body are provided with the sweeping holes, so that dust or solid particle media accumulated in the valve cavity can be swept by external high-pressure gas when the valve is closed (namely no pressure exists in the valve cavity) if necessary, and the dust or solid particle media are discharged to the media outflow channel. The ash and slag discharging ball valve provided by the utility model adopts a spring cavity full-protection structure, and prevents the spring from losing efficacy and causing valve leakage due to accumulation of powder or solid particle media at the spring cavity.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, it is still within the scope of the present invention if they fall within the scope of the claims of the present invention and their equivalents.
Claims (10)
1. The utility model provides an ash and slag discharging ball valve which characterized in that includes:
the valve comprises a valve body, a valve cavity, a medium inflow passage and a medium outflow passage, wherein the medium inflow passage and the medium outflow passage are communicated with the valve cavity;
the ball body is arranged in the valve cavity, and a first through hole is formed in the ball body;
the upstream valve seat and the downstream valve seat are respectively arranged between two sides of the ball body and the wall of the valve cavity; the upstream valve seat is provided with a second through hole, one end of the second through hole is communicated with the medium inflow channel, and the other end of the second through hole corresponds to the first through hole; the downstream valve seat is provided with a third through hole, one end of the downstream valve seat is communicated with the medium outflow channel, and the other end of the downstream valve seat corresponds to the first through hole; the medium inflow channel, the second through hole, the first through hole, the third through hole and the medium outflow channel are matched to form a medium flow channel;
the valve body is provided with a valve rod passage communicated with the valve cavity, one end of the valve rod is connected with the ball body, and the other end of the valve rod penetrates through the valve rod passage and extends out of the valve body; the ball is respectively and rotatably connected with the upstream valve seat and the downstream valve seat, and the valve rod is used for driving the ball to rotate so as to open or close the medium flow passage;
and the downstream valve seat is provided with an ash guide groove which is communicated with the valve cavity and the medium outflow passage.
2. The ash and slag discharging ball valve according to claim 1, wherein the downstream valve seat comprises a downstream valve seat body and a valve seat support member, the third through hole is formed in the valve seat support member, the downstream valve seat body is connected with the ball body and the valve seat support member respectively, the outer side wall of the valve seat support member is connected with the valve cavity wall, and part of the outer side wall of the valve seat support member is recessed to form the ash guiding groove in cooperation with the valve cavity wall.
3. The ash and slag discharging ball valve according to claim 1 or 2, comprising a plurality of ash guiding grooves which are uniformly distributed around the axis of the third through hole.
4. The ash and slag discharging ball valve according to claim 1, wherein a purge hole communicating with the valve chamber is formed in the valve body, and a purge hole plug is installed in the purge hole.
5. The ash and slag discharging ball valve according to claim 2, wherein an annular sealing structure is provided at least one of between the upstream valve seat and the valve chamber wall and between the downstream valve seat body and the valve seat support, wherein the upstream valve seat and the downstream valve seat are first sealed members, and the valve chamber wall and the valve seat support are second sealed members;
the annular sealing structure comprises a butterfly spring and two sealing rings, the two sealing rings are respectively connected with the first sealed piece and the second sealed piece to realize the sealing connection of the first sealed piece and the second sealed piece, the butterfly spring is wound on the periphery of the second through hole, and two axial ends of the butterfly spring are respectively connected with the two sealing rings.
6. The ash and slag discharging ball valve according to claim 5, wherein a sealing pressure pad is disposed between the belleville spring and the sealing ring.
7. An ash and slag discharging ball valve according to claim 6, wherein the surface of the disc spring facing the ball body is connected to the corresponding sealing pressure pad near the outer side wall thereof, and the surface of the disc spring facing away from the ball body is connected to the corresponding sealing pressure pad near the inner side wall thereof.
8. The ash and slag discharge ball valve of claim 6, wherein the surface of the first sealed member and the surface of the second sealed member cooperate to form a spring chamber for receiving an annular sealing structure;
the spring cavity comprises a main cavity and two side cavities which are communicated with each other, the belleville spring is arranged in the main cavity, the sealing ring and the sealing pressure pad which are positioned on the same side of the belleville spring are accommodated in the same side cavity, the sealing ring is pressed in the side cavity by the corresponding sealing pressure pad, and the part of the sealing pressure pad extends out of the side cavity and is connected with the belleville spring.
9. The ash and slag discharging ball valve according to claim 1, wherein the valve body comprises an upstream valve body and a downstream valve body, the upstream valve body and the downstream valve body are fixedly connected and are internally fitted to form a valve cavity, the upstream valve seat is connected with the upstream valve body, and the downstream valve seat is connected with the downstream valve body; the valve stem passage is disposed on the upstream valve body.
10. The ash and slag discharging ball valve according to claim 1, further comprising a lower valve rod, wherein one end of the lower valve rod is rotatably connected with the ball body, the rotation axis of the lower valve rod is aligned with the rotation axis of the ball body, and the other end of the lower valve rod is fixedly connected with the valve body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122514504.3U CN216200755U (en) | 2021-10-19 | 2021-10-19 | Ash and slag discharging ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122514504.3U CN216200755U (en) | 2021-10-19 | 2021-10-19 | Ash and slag discharging ball valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216200755U true CN216200755U (en) | 2022-04-05 |
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ID=80884379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122514504.3U Active CN216200755U (en) | 2021-10-19 | 2021-10-19 | Ash and slag discharging ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216200755U (en) |
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2021
- 2021-10-19 CN CN202122514504.3U patent/CN216200755U/en active Active
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