CN212318799U - Rotary valve capable of generating pressure difference - Google Patents
Rotary valve capable of generating pressure difference Download PDFInfo
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- CN212318799U CN212318799U CN202020645168.9U CN202020645168U CN212318799U CN 212318799 U CN212318799 U CN 212318799U CN 202020645168 U CN202020645168 U CN 202020645168U CN 212318799 U CN212318799 U CN 212318799U
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Abstract
The utility model provides a can produce pressure differential's rotary valve belongs to rotary valve technical field. The rotary valve capable of generating the pressure difference comprises a silo component, a rotary valve component, an exhaust component and a conveying pipeline component. The rotary valve assembly includes a housing and a spool. When defeated material chamber and exhaust hole intercommunication, gas leakage through exhaust subassembly, the pressure reduction of defeated material intracavity is the same to the pressure in the defeated material intracavity, the case continues to rotate, when defeated material chamber and discharge gate intercommunication, the powder material of defeated material intracavity is taken away to the conveying air current in the defeated material intracavity, when defeated material chamber and discharge gate intercommunication, the pressure in the regulation defeated material intracavity through exhaust subassembly is the same with the pressure in the defeated material pipe subassembly, effectively reduce the pressure differential of defeated material chamber and defeated material pipe subassembly, reduce the unstable condition of powder material conveying air current, make the more steady transport of powder material, and then there is the pressure differential at the current rotary valve both ends of effectual improvement, easily lead to the unstable problem of powder material conveying air.
Description
Technical Field
The utility model relates to a rotary valve field particularly, relates to a can produce rotary valve of pressure differential.
Background
Powder material is carried to feed bin bottom rotary valve, the long vulcanization pine of opening in powder feed bin bottom moves the gas, produce pressure bottom the feed bin, send the material into conveying pipeline through the rotary valve, carry the material through the air current in the conveying pipeline, the pressure of feed bin bottom is greater than the pressure in the conveying pipeline, there is pressure differential at the rotary valve both ends, when the powder material that the rotary valve was carried gets into conveying pipeline, because there is pressure differential at the rotary valve both ends easily to lead to the powder material to carry the unstable of gas rheology, and then influence the steady transport of powder material.
How to invent a rotary valve capable of generating a pressure difference to improve the problems becomes a problem to be solved by the technical personnel in the field.
SUMMERY OF THE UTILITY MODEL
In order to compensate the above deficiency, the utility model provides a can produce pressure differential's rotary valve aims at improving current rotary valve both ends and has pressure differential, easily leads to the unstable problem of powder material conveying air current.
The utility model discloses a realize like this:
a rotary valve capable of generating pressure difference comprises a bin assembly, a rotary valve assembly, a gas exhaust assembly and a material conveying pipe assembly.
The rotary valve component comprises a shell and a valve core, the shell is fixedly connected to the bottom end of the stock bin component, a feed inlet is formed in the upper end of the shell and communicated with the interior of the stock bin component, a discharge outlet is formed in the lower end of the shell, exhaust holes are formed in one side of the shell, a material conveying cavity is uniformly formed in the valve core, the valve core is rotatably connected to the interior of the shell, the outer wall of the periphery of the material conveying cavity is attached to the inner wall of the shell, and the feed inlet, the discharge outlet and the exhaust holes can be communicated with the material conveying cavity;
the exhaust assembly is fixedly communicated with the material conveying cavity through the exhaust hole;
the feeding pipe component is fixedly connected to the bottom end of the shell, and the discharge port is communicated with the interior of the feeding pipe component.
In an embodiment of the present invention, the bin assembly comprises a bin and a first sealing gasket, the bin is fixedly connected to the top end of the housing, and the first sealing gasket is disposed between the bin and the housing.
The utility model discloses an in one embodiment, the equal fixedly connected with sealing washer of the peripheral outer wall in defeated material chamber, the peripheral outer wall in defeated material chamber passes through the sealing washer laminate in shell inner wall.
The utility model discloses an in one embodiment, the case includes pivot, case body and baffle, the fixed cover of case body connect in the pivot, the baffle along the even fixed connection of circumferencial direction in the recess of case body outer wall, defeated material chamber set up in the case body with between the baffle, sealing washer fixed connection in case body outer wall with the baffle outside.
In an embodiment of the present invention, the housing includes a housing and a cover plate, the cover plate is fixedly connected to the opening side of the housing, and the two ends of the rotation shaft are respectively rotatably connected to the housing and the cover plate.
In an embodiment of the present invention, a handle is fixedly connected to one side of the cover plate.
In an embodiment of the present invention, the handle member includes a handle and an anti-slip cover, and the anti-slip cover is fixedly sleeved on the handle.
The utility model discloses an in one embodiment, the exhaust subassembly includes blast pipe and flow control valve blast pipe one end is fixed communicate in the exhaust hole, flow control valve fixed connection in the blast pipe.
The utility model discloses an in one embodiment, the conveying pipeline subassembly includes conveying pipeline and connecting pipe, connecting pipe one end is fixed communicate in the conveying pipeline, connecting pipe other end fixed connection in the shell bottom, the connecting pipe communicate in the discharge gate.
In an embodiment of the present invention, a second sealing gasket is disposed between the connecting pipe and the housing.
The utility model has the advantages that: the utility model discloses a rotary valve that can produce pressure differential that obtains through the design, during the use, the feed bin subassembly stores powder material and the inside circulation has the sulphide wind, there is directional conveying air current inside the conveying pipeline subassembly, the pressure in the feed bin subassembly is greater than the pressure in the conveying pipeline subassembly, be convenient for powder material with the air current by high pressure to the low pressure shift, reduce the condition of powder material reverse flow, and then reduce the palirrhea condition of powder material, the case rotates, the conveying chamber rotates along with it, when conveying chamber and feed inlet communicate, the air current is by high pressure to the low pressure motion, the sulphide wind drives powder material to get into the conveying chamber, conveying chamber internal pressure rises, the case continues to rotate, the conveying chamber rotates along with it, when the conveying chamber communicates with the exhaust hole, through the gas leakage of exhaust subassembly, the pressure in the conveying chamber reduces to the same in the conveying pipeline, the case continues to rotate, the conveying cavity rotates along with the conveying cavity, when the conveying cavity is communicated with the discharge port, powder materials in the conveying cavity are taken away by conveying airflow in the conveying pipe, the purpose of conveying the powder materials is achieved, when the conveying cavity is communicated with the discharge port, the pressure in the conveying cavity is adjusted through the exhaust assembly to be the same as the pressure in the conveying pipe assembly, the pressure difference between the conveying cavity and the conveying pipe assembly is effectively reduced, the unstable condition of conveying airflow of the powder materials is reduced, more stable conveying of the powder materials is realized, the pressure difference exists at two ends of the existing rotary valve in an effective improvement mode, and the problem that the conveying airflow of the powder materials is unstable is easily caused.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a rotary valve configured to generate a pressure differential in accordance with an embodiment of the present invention;
FIG. 2 provides a schematic structural view of a rotary valve assembly according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a section a in fig. 2 according to an embodiment of the present invention;
fig. 4 is a schematic structural view of the valve element according to the embodiment of the present invention;
fig. 5 is a schematic structural view of an embodiment of the present invention provided at the housing;
FIG. 6 is a schematic view of a handle member according to an embodiment of the present invention;
fig. 7 is a schematic structural view of an exhaust assembly according to an embodiment of the present invention;
FIG. 8 is a schematic view of a feed conveyor assembly according to an embodiment of the present invention;
fig. 9 is an enlarged schematic structural diagram of a point B in fig. 8 according to an embodiment of the present invention;
FIG. 10 is a schematic view of a lifting silo assembly according to an embodiment of the present invention;
fig. 11 is an enlarged schematic structural diagram of a point C in fig. 10 according to an embodiment of the present invention.
In the figure: 100-a bin assembly; 110-a storage bin; 120-a first gasket; 200-a rotary valve assembly; 210-a housing; 211-a housing; 212-a cover plate; 213-a handle piece; 2131-a handle; 2132-antiskid sleeve; 220-a valve core; 221-a rotating shaft; 222-a cartridge body; 223-a separator; 230-a delivery chamber; 240-feed inlet; 250-a discharge hole; 260-vent holes; 270-sealing ring; 300-an exhaust assembly; 310-an exhaust pipe; 320-a flow control valve; 400-a delivery pipe assembly; 410-a material conveying pipe; 420-a connecting tube; 430-second gasket.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Examples
Referring to fig. 1, the present invention provides a rotary valve capable of generating a pressure difference, including a bin assembly 100, a rotary valve assembly 200, an exhaust assembly 300 and a material conveying pipe assembly 400, wherein the bin assembly 100 is used for storing powder materials, the inside of the bin assembly is circulated with sulfuration air, the rotary valve assembly 200 is used for rotatably conveying the powder materials, the exhaust assembly 300 is used for adjusting the pressure in a space for conveying the powder materials, the material conveying pipe assembly 400 is used for conveying the materials, and the inside of the material conveying pipe assembly has a directional conveying airflow.
Referring to fig. 2 and 3, the rotary valve assembly 200 includes a housing 210 and a valve core 220, the housing 210 is fixedly connected to the bottom end of the bin assembly 100 by bolts, a feed inlet 240 is formed at the upper end of the housing 210, the feed inlet 240 is communicated with the interior of the bin assembly 100, a discharge outlet 250 is formed at the lower end of the housing 210, an exhaust hole 260 is formed at one side of the housing 210, a material conveying cavity 230 is uniformly formed on the valve core 220, the valve core 220 is rotatably connected to the interior of the housing 210, outer walls of the periphery of the material conveying cavity 230 are attached to the inner wall of the housing 210, a closed space is formed by the material conveying cavity 230 and the inner wall of the housing 210, the feed inlet 240, the discharge outlet 250 and the exhaust hole 260 can be communicated with the material conveying cavity 230, during the rotation of the valve, the outer wall of the delivery chamber 230 is attached to the inner wall of the casing 210 by a sealing ring 270.
Referring to fig. 4, the valve core 220 includes a rotating shaft 221, a valve core body 222 and a partition 223, the valve core body 222 is fixedly sleeved on the rotating shaft 221 through a flat key, the partition 223 is uniformly and fixedly connected in a groove on the outer wall of the valve core body 222 along the circumferential direction, the feeding cavity 230 is arranged between the valve core body 222 and the partition 223, the feeding cavity 230 is a cavity formed by the valve core body 222 and the partition 223, a sealing ring 270 is fixedly connected on the outer wall of the valve core body 222 and the outer side of the partition 223, and the sealing ring 270 is fixedly connected on the outer wall of the valve core body 222 and the outer side of the partition 223 through adhesive.
Referring to fig. 5, the housing 210 includes a housing 211 and a cover plate 212, the cover plate 212 is fixedly connected to an opening side of the housing 211, the cover plate 212 is fixedly connected to the opening side of the housing 211 through bolts, two ends of the rotating shaft 221 are rotatably connected to the housing 211 and the cover plate 212, respectively, and two ends of the rotating shaft 221 are rotatably connected to the housing 211 and the cover plate 212 through bearings, respectively.
Referring to fig. 6, a handle 213 is fixedly connected to one side of the cover plate 212, the handle 213 is fixedly connected to one side of the cover plate 212 by bolts or welding, the handle 213 includes a handle 2131 and an anti-slip sleeve 2132, the anti-slip sleeve 2132 is fixedly connected to the handle 2131, the connecting bolts between the cover plate 212 and the housing 211 are released, and an external force is applied by the handle 2131, so that an operator can open the cover plate 212, and further, the maintenance and replacement of parts inside the housing 211 are facilitated.
Referring to fig. 7, the exhaust assembly 300 is fixedly connected to the material delivery chamber 230 through the exhaust hole 260, the exhaust assembly 300 includes an exhaust pipe 310 and a flow control valve 320, one end of the exhaust pipe 310 is fixedly connected to the exhaust hole 260 through welding or screwing, the flow control valve 320 is fixedly connected to the exhaust pipe 310, and the flow control valve 320 is used to adjust the pressure inside the material delivery chamber 230.
Referring to fig. 8, a feeding tube assembly 400 is fixedly connected to the bottom end of a housing 210, a discharge port 250 is communicated with the inside of the feeding tube assembly 400, the feeding tube assembly 400 includes a feeding tube 410 and a connecting tube 420, one end of the connecting tube 420 is fixedly communicated with the feeding tube 410 by welding, the other end of the connecting tube 420 is fixedly connected to the bottom end of the housing 210 by a bolt, and the connecting tube 420.
Referring to fig. 9, a second sealing gasket 430 is disposed between the connecting pipe 420 and the housing 210, and the second sealing gasket 430 is tightly pressed between the connecting pipe 420 and the housing 210 by bolts, so as to reduce the leakage of the powder material and the pressure in the connecting pipe 420.
Referring to fig. 10 and 11, the bin assembly 100 includes a bin 110 and a first sealing gasket 120, the bin 110 is fixedly connected to the top end of the housing 210 by bolts, the first sealing gasket 120 is disposed between the bin 110 and the housing 210, and the first sealing gasket 120 is tightly pressed between the bin 110 and the housing 210 by bolts, so as to reduce the leakage of the powder material and the pressure in the bin 110.
In this embodiment, the storage bin 110 stores powder material and the inside of the storage bin is circulated with sulfuration air, the inside of the material delivery pipe 410 is provided with directional conveying airflow, the pressure in the storage bin 110 is greater than the pressure in the material delivery pipe 410, so that the powder material is transferred from high pressure to low pressure along with the airflow, the condition of reverse flow of the powder material is reduced, and further the condition of reverse flow of the powder material is reduced, the rotating shaft 221 rotates, the rotating shaft 221 drives the valve core body 222 and the partition plate 223 to rotate, when the material delivery cavity 230 is communicated with the feed inlet 240, the airflow moves from high pressure to low pressure, the sulfuration air drives the powder material to enter the material delivery cavity 230, the pressure in the material delivery cavity 230 rises, the rotating shaft 221 continues to rotate, the material delivery cavity 230 rotates along with the rotating shaft, when the material delivery cavity 230 is communicated with the exhaust hole 260, air leaks through the exhaust pipe 310 and the flow control valve 320, the, when the material conveying cavity 230 is communicated with the material outlet 250, the conveying airflow in the material conveying pipe 410 takes away the powder materials in the material conveying cavity 230 to achieve the purpose of conveying the powder materials, when the material conveying cavity 230 is communicated with the material outlet 250, the pressure in the material conveying cavity 230 is adjusted to be the same as the pressure in the material conveying pipe 410 through the flow control valve 320, the pressure difference between the material conveying cavity 230 and the material conveying pipe 410 is effectively reduced, the unstable condition of the conveying airflow of the powder materials is reduced, the powder materials are conveyed more stably, the problem that the pressure difference exists at two ends of the existing rotary valve is effectively solved, and the conveying airflow of the powder materials is easy to be unstable.
In particular, the working principle of the rotary valve capable of generating the pressure difference is as follows: when the device is used, powder materials are stored in the bin 110, the vulcanizing wind flows through the bin, directional conveying airflow is arranged in the conveying pipe 410, the pressure in the bin 110 is greater than the pressure in the conveying pipe 410, the powder materials are convenient to transfer from high pressure to low pressure along with the airflow, the condition that the powder materials flow reversely is reduced, and the condition that the powder materials flow reversely is further reduced, the rotating shaft 221 rotates, the rotating shaft 221 drives the valve core body 222 and the partition plate 223 to rotate, when the conveying cavity 230 is communicated with the feed inlet 240, the airflow moves from high pressure to low pressure, the vulcanizing wind drives the powder materials to enter the conveying cavity 230, the pressure in the conveying cavity 230 rises, the rotating shaft 221 continues to rotate, the conveying cavity 230 rotates along with the rotating shaft, when the conveying cavity 230 is communicated with the exhaust hole 260, air leaks through the exhaust pipe 310 and the flow control valve 320, the pressure in the conveying cavity 230 is reduced to be the same as the, when the material conveying cavity 230 is communicated with the material outlet 250, the conveying airflow in the material conveying pipe 410 takes away the powder materials in the material conveying cavity 230 to achieve the purpose of conveying the powder materials, when the material conveying cavity 230 is communicated with the material outlet 250, the pressure in the material conveying cavity 230 is adjusted to be the same as the pressure in the material conveying pipe 410 through the flow control valve 320, the pressure difference between the material conveying cavity 230 and the material conveying pipe 410 is effectively reduced, the unstable condition of the conveying airflow of the powder materials is reduced, the powder materials are conveyed more stably, the problem that the pressure difference exists at two ends of the existing rotary valve is effectively solved, and the conveying airflow of the powder materials is easy to be unstable.
The connecting bolts of the cover plate 212 and the shell 211 are removed, external force is applied through the handle 2131, operators can conveniently open the cover plate 212, and then parts in the shell 211 can be conveniently overhauled and replaced.
It should be noted that the specific model specification of the flow control valve 320 needs to be determined by type selection according to the actual specification of the device, and the specific type selection calculation method adopts the prior art, so detailed description is omitted.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A rotary valve capable of generating a pressure difference is characterized by comprising
A bin assembly (100);
the rotary valve component (200) comprises a shell (210) and a valve core (220), the shell (210) is fixedly connected to the bottom end of the stock bin component (100), a feed port (240) is formed in the upper end of the shell (210), the feed port (240) is communicated with the interior of the stock bin component (100), a discharge port (250) is formed in the lower end of the shell (210), an exhaust hole (260) is formed in one side of the shell (210), material conveying cavities (230) are uniformly formed in the valve core (220), the valve core (220) is rotatably connected to the interior of the shell (210), the outer walls of the periphery of the material conveying cavities (230) are attached to the inner wall of the shell (210), and the feed port (240), the discharge port (250) and the exhaust hole (260) can be communicated with the material conveying cavities (230);
the exhaust component (300), the exhaust component (300) is fixedly communicated with the material conveying cavity (230) through the exhaust hole (260);
the feeding pipe assembly (400), the feeding pipe assembly (400) is fixedly connected to the bottom end of the shell (210), and the discharge hole (250) is communicated with the interior of the feeding pipe assembly (400).
2. The differential pressure generating rotary valve according to claim 1, wherein the cartridge assembly (100) comprises a cartridge (110) and a first sealing gasket (120), the cartridge (110) is fixedly connected to the top end of the housing (210), and the first sealing gasket (120) is disposed between the cartridge (110) and the housing (210).
3. A rotary valve for generating differential pressure as claimed in claim 1 wherein the outer wall of the periphery of said delivery chamber (230) is fixedly connected with a sealing ring (270), and the outer wall of the periphery of said delivery chamber (230) is attached to the inner wall of said housing (210) by said sealing ring (270).
4. The rotary valve capable of generating the differential pressure according to claim 3, wherein the valve element (220) comprises a rotating shaft (221), a valve element body (222) and a partition plate (223), the valve element body (222) is fixedly sleeved on the rotating shaft (221), the partition plate (223) is uniformly and fixedly connected in a groove on the outer wall of the valve element body (222) along the circumferential direction, the material conveying cavity (230) is arranged between the valve element body (222) and the partition plate (223), and the sealing ring (270) is fixedly connected on the outer wall of the valve element body (222) and the outer side of the partition plate (223).
5. A rotary valve for generating differential pressure according to claim 4, wherein the housing (210) comprises a housing (211) and a cover plate (212), the cover plate (212) is fixedly connected to the open side of the housing (211), and both ends of the rotary shaft (221) are rotatably connected to the housing (211) and the cover plate (212), respectively.
6. A rotary valve for generating differential pressure according to claim 5 wherein a handle member (213) is fixedly attached to one side of the cover plate (212).
7. A pressure differential generating rotary valve as claimed in claim 6 wherein the handle member (213) comprises a handle (2131) and a slip resistant sleeve (2132), the slip resistant sleeve (2132) being fixedly attached to the handle (2131).
8. A rotary valve for generating differential pressure according to claim 1 wherein the exhaust assembly (300) comprises an exhaust pipe (310) and a flow control valve (320), one end of the exhaust pipe (310) is fixedly connected to the exhaust hole (260), and the flow control valve (320) is fixedly connected to the exhaust pipe (310).
9. A rotary valve for generating differential pressure according to claim 1, wherein the feed delivery pipe assembly (400) comprises a feed delivery pipe (410) and a connecting pipe (420), one end of the connecting pipe (420) is fixedly connected to the feed delivery pipe (410), the other end of the connecting pipe (420) is fixedly connected to the bottom end of the casing (210), and the connecting pipe (420) is connected to the outlet (250).
10. A rotary valve for generating a pressure difference according to claim 9, characterized in that a second sealing gasket (430) is arranged between the connection pipe (420) and the housing (210).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020645168.9U CN212318799U (en) | 2020-04-24 | 2020-04-24 | Rotary valve capable of generating pressure difference |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020645168.9U CN212318799U (en) | 2020-04-24 | 2020-04-24 | Rotary valve capable of generating pressure difference |
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| CN212318799U true CN212318799U (en) | 2021-01-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113086649A (en) * | 2021-04-29 | 2021-07-09 | 中国华能集团清洁能源技术研究院有限公司 | Flow valve capable of realizing low pressure to high pressure of powder |
-
2020
- 2020-04-24 CN CN202020645168.9U patent/CN212318799U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113086649A (en) * | 2021-04-29 | 2021-07-09 | 中国华能集团清洁能源技术研究院有限公司 | Flow valve capable of realizing low pressure to high pressure of powder |
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