CN211624244U - Micro-control combined regulating valve - Google Patents
Micro-control combined regulating valve Download PDFInfo
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- CN211624244U CN211624244U CN202020141689.0U CN202020141689U CN211624244U CN 211624244 U CN211624244 U CN 211624244U CN 202020141689 U CN202020141689 U CN 202020141689U CN 211624244 U CN211624244 U CN 211624244U
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Abstract
A micro-control combined type regulating valve solves the problems of difficult flow control, low regulating precision, scouring, noise and vibration of valve internals during pressure reduction and flow regulation in the prior art. Including valve body and valve gap, its characterized in that: a valve inlet on one side of the valve body is communicated with a flow equalizing cavity in the middle of the valve body through a guide cavity, a flow adjusting valve seat is arranged at the lower part of a flow adjusting cage in the flow equalizing cavity, and a mixing cavity is connected with a valve outlet on the other side of the valve body; a composite valve core is arranged in the flow regulating valve seat, a driving valve rod is arranged at the upper end of the composite valve core, and the driving valve rod penetrates through the upper end of the through hole in the middle of the valve cover and is connected with a driving device on the supporting frame; and a sealing filler and a positioning sealing sleeve are respectively arranged between the driving valve rod and the upper and lower end parts of the through hole in the middle of the valve cover. The valve core sealing device is reasonable in design, compact in structure, capable of normally controlling medium flow under the condition of small opening, small in scouring on the valve seat sealing surface, free of scouring on the valve core sealing surface, low in pressure reduction noise and capable of effectively preventing medium leakage.
Description
Technical Field
The utility model belongs to the technical field of the governing valve, concretely relates to can be under the little aperture circumstances normal control medium flow, it is little to the sealed face of disk seat erode, does not have to erode the sealed face of case, and noise when stepping down is low, can effectively prevent the micro-control combined type governing valve of medium hourglass outward.
Background
At present, when regulating valves on special liquid medium conveying pipelines such as steam, high-pressure water, acid, solution and the like frequently work under a small stroke, the flow of the medium of the regulating valves is small, the flow is difficult to control, the regulating precision is low, the phenomenon that the flow of the medium is small and large easily occurs, and the problem of unstable operation of equipment is caused. Moreover, real-time observation and operation are manually carried out, program automation control cannot be realized, the working efficiency is influenced, and the operation cost is increased. In addition, when the pressure difference between the front and the back of a medium is large, the regulating valve with the existing structure is easy to seriously flush the sealing surfaces of the valve, the valve seat and the valve core, so that the regulating valve cannot be tightly closed; when the pressure difference between the front and the rear of the medium is small, the regulating valve cannot effectively reduce the pressure of the medium, so that the equipment works at overpressure, and the running safety of the equipment is damaged. Meanwhile, the existing regulating valve can generate the phenomena of scouring, noise, vibration of valve internals and difficulty in controlling the flow characteristics when reducing pressure and regulating flow. There is a need for an improved construction for small flow control valves of the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to above-mentioned problem, provide one kind and can be under the little aperture circumstances normal control medium flow, it is little to the sealed face of disk seat erode, to the sealed face of case do not have erode, noise when stepping down is low, can prevent effectively that the medium from leaking the micro-control combined type governing valve outward.
The utility model adopts the technical proposal that: this micro-control combined type governing valve includes the valve body, and the upper end of valve body is provided with valve gap, its characterized in that: a valve inlet is formed in one side of the valve body and is communicated with a flow equalizing cavity in the middle of the valve body through a guide cavity which is obliquely arranged, a flow adjusting cage is arranged in the flow equalizing cavity, a flow adjusting valve seat is arranged at the lower part of the flow adjusting cage and is positioned in a mixing cavity in the lower part of the valve body, and the mixing cavity is connected with a valve outlet formed in the other side of the valve body; a composite valve core which is vertically arranged is also arranged in the flow regulating valve seat, a driving valve rod is arranged at the upper end of the composite valve core, and the driving valve rod penetrates through the upper end of the through hole in the middle of the valve cover and is connected with a driving device arranged on the supporting frame; and a positioning sealing sleeve is arranged between the driving valve rod and the lower end part of the middle through hole of the valve cover, and a sealing filler is arranged between the driving valve rod and the upper end part of the middle through hole of the valve cover.
The flow control cage that the intracavity set up flow equalizes of valve body comprises the cage cover main part, and the middle part of cage cover main part is provided with the cage cover and leads to the chamber, is provided with the cage cover reducing punch combination that is linked together with the chamber that flow equalizes on the lower part lateral wall of cage cover main part, the outside on cage cover main part upper portion and the pore wall fixed connection of the chamber top that flow equalizes. So that the medium enters the guide cavity of the regulating valve from the valve inlet, the medium is accelerated, the medium can rapidly enter the flow equalizing cavity, and the medium uniformly passes through the flow regulating cage; meanwhile, when the medium has small flow, the cage cover reducing hole group arranged on the side wall of the flow adjusting cage cover can play a role in effectively reducing pressure and controlling the flow.
The flow regulating valve seat is composed of a valve seat main body, a valve core inserting cavity is arranged in the middle of the valve seat main body, a valve core inserting opening is formed in the upper end of the valve core inserting cavity, a valve seat sealing surface is arranged at the opening of the valve core inserting opening, and the lower end of the valve core inserting cavity is closed; a valve seat variable diameter hole group communicated with the mixing cavity is arranged on the side wall of the lower part of the valve core inserting cavity; the upper portion of disk seat main part is provided with the disk seat connecting portion that is used for linking to each other with the protruding edge of pore wall above the hybrid chamber, and still is provided with the scour protection boss on the disk seat connecting portion. The anti-scouring boss is arranged on the valve seat connecting part of the flow regulating valve seat, so that the medium acting force is prevented from directly scouring the sealing surface of the valve seat, and the service life of the flow regulating valve seat is prolonged.
The composite valve core arranged in the flow regulating valve seat is composed of a valve core main body, the middle part of the valve core main body is provided with a valve core flow guide cavity, the upper end of the valve core flow guide cavity is closed, and the lower end of the valve core flow guide cavity is provided with a flow guide outlet; a valve core reducing hole group communicated with the inner cavity of the flow regulating cage is arranged on the upper side wall of the valve core flow guide cavity; an anti-impact connector is arranged at the upper part of the valve core main body, an anti-impact sheath is movably sleeved at the upper part of the anti-impact connector, a disc spring pressing ring is arranged at the root of a driving valve rod above the anti-impact sheath, and a disc spring is arranged between the lower side surface of the disc spring pressing ring and the upper side surface of the anti-impact sheath; and a valve core sealing surface is arranged at the position where the anti-impact connector is connected with the valve core main body. The scouring-proof jacket is used for offsetting the scouring force which increases the medium flow velocity due to the decompression action when small flow circulates by means of the up-and-down movement mode of the elastic force of the disc spring, and further effectively protecting the composite valve core.
Still be provided with damping device on the support frame, damping device is including setting up the valve-stem nut who drives valve rod upper end, and valve-stem nut sets up the inside at the support frame, and valve-stem nut's upper portion links to each other with the top of support frame through belleville spring. In the process of driving the valve rod nut and the composite valve core to rapidly act by the driving device, the vibration is reduced by driving the valve rod nut at the end part of the valve rod to slide; meanwhile, the disk spring can also effectively buffer the impact force of the driving valve rod in repeated motion.
The utility model has the advantages that: because the utility model adopts the structure that the valve inlet on one side of the valve body is communicated with the flow equalizing cavity in the middle of the valve body through the guide cavity which is obliquely arranged, the lower part of the flow adjusting cage which is arranged in the flow equalizing cavity is provided with the flow adjusting valve seat, the flow adjusting valve seat is positioned in the mixing cavity on the lower part of the valve body, and the mixing cavity is connected with the valve outlet which is arranged on the other side of the valve body; a composite valve core which is vertically arranged is also arranged in the flow regulating valve seat, a driving valve rod is arranged at the upper end of the composite valve core, and the driving valve rod penetrates through the upper end of the through hole in the middle of the valve cover and is connected with a driving device arranged on the supporting frame; the valve seat has the advantages that the positioning sealing sleeve is arranged between the lower end parts of the driving valve rod and the valve cover middle through hole, and the sealing filler is arranged between the driving valve rod and the upper end part of the valve cover middle through hole, so that the valve seat is reasonable in design and compact in structure, can normally control the medium flow under the condition of small opening degree, is small in direct scouring to the sealing surface of the valve seat, is free of scouring to the sealing surface of the valve core, is low in noise and small in vibration during pressure reduction, and can effectively prevent the medium from leaking outwards.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a schematic view of the internal structure of the valve body in the use state of the present invention with small flow rate control and pressure reduction.
FIG. 3 is a schematic illustration of one construction of the flow regulating cage of FIG. 2.
Fig. 4 is a schematic diagram of a composite valve cartridge of fig. 2.
Fig. 5 is a schematic view of a construction of the flow regulating valve seat of fig. 2.
Fig. 6 is a schematic view of the internal structure of the valve body in the normal operation flow control and decompression use state of the present invention.
The sequence numbers in the figures illustrate: 1 valve body, 2 valve covers, 3 valve inlets, 4 guide cavities, 5 flow equalizing cavities, 6 mixing cavities, 7 valve outlets, 8 flow regulation cages, 9 composite type valve cores, 10 flow regulation valve seats, 11 drive valve rods, 12 positioning sealing sleeves, 13 sealing fillers, 14 support frames, 15 shock absorption devices, 16 anti-impact cavities, 17 pressure reduction cavities, 18 metal composite pads, 19 cage cover main bodies, 20 cage cover through cavities, 21 cage cover reducing hole groups, 22 connecting threads, 23 valve core main bodies, 24 valve core flow guide cavities, 25 valve core reducing hole groups, 26 flow guide outlets, 27 anti-impact connecting bodies, 28 anti-impact sheaths, 29 connecting flat keys, 30 disc springs, 31 disc spring press rings, 32 valve core sealing surfaces, 33 valve seat main bodies, 34 valve core plug-in cavities, 35 valve core sockets, 36 valve seat reducing hole groups, 37 valve seat connecting parts, 38 anti-impact bosses and 39 valve seat sealing surfaces.
Detailed Description
The specific structure of the present invention is described in detail with reference to fig. 1 to 6. The micro-control combined type regulating valve comprises a valve body 1, wherein a valve cover 2 is arranged at the upper end of the valve body 1, a valve inlet 3 is arranged on one side of the valve body 1, and the valve inlet 3 is communicated with a flow equalizing cavity 5 in the middle of the valve body 1 through a guide cavity 4 which is obliquely arranged. A flow adjusting cage cover 8 is arranged in the flow equalizing cavity 5 of the valve body 1, the flow adjusting cage cover 8 is composed of a cylindrical cage cover main body 19, and a cage cover through cavity 20 is arranged in the middle of the cage cover main body 19. The side wall of the lower part of the cage through cavity 20 of the cage main body 19 is provided with a cage reducing hole group 21 which is communicated with the flow equalizing cavity 5 and the aperture of which is gradually reduced from top to bottom; the outer side of the upper part of the cage main body 19 is fixedly connected with the hole wall above the flow equalizing cavity 5 through a connecting thread 22; then the medium enters the guide cavity 4 of the regulating valve from the valve inlet 3, the medium is accelerated, and the medium can rapidly enter the flow equalizing cavity 5, so that the medium uniformly passes through the flow regulating cage 8; meanwhile, when the medium has small flow, the cage cover reducing hole group 21 arranged on the side wall of the flow adjusting cage cover 8 can play a role in effectively reducing pressure and controlling the flow.
The lower part of the flow regulating cage cover 8 is provided with a flow regulating valve seat 10, the flow regulating valve seat 10 is positioned in a mixing cavity 6 at the lower part of the valve body 1, and the mixing cavity 6 is connected with a valve outlet 7 arranged at the other side of the valve body 1. The flow regulating valve seat 10 is composed of a valve seat main body 33, a valve core inserting cavity 34 is arranged in the middle of the valve seat main body 33, a valve core inserting opening 35 is arranged at the upper end of the valve core inserting cavity 34, and a valve seat sealing surface 39 formed by overlaying stellite hard alloy (such as cobalt chromium tungsten hard alloy) is arranged on the periphery of the inner side of an opening of the valve core inserting opening 35; the lower end of the spool socket chamber 34 is closed. The lower side wall of the valve core plug-in cavity 34 of the flow regulating valve seat 10 is provided with a valve seat reducing hole group 36 which is communicated with the mixing cavity 6 and the aperture of which is gradually reduced from top to bottom. The upper part of the valve seat main body 33 of the flow regulating valve seat 10 is provided with a valve seat connecting part 37 which is used for being connected with the convex edge of the hole wall above the mixing cavity 6, and a metal composite pad 18 is arranged between the valve seat connecting part 37 and the convex edge of the hole wall in the middle of the valve body 1; the valve seat connecting portion 37 of the flow rate adjustment valve seat 10 is further provided with an impingement boss 38. The anti-scouring boss 38 arranged on the valve seat connecting part 37 of the flow regulating valve seat 10 is used for avoiding the medium acting force from directly generating scouring damage on the valve seat sealing surface 39 and prolonging the service life of the flow regulating valve seat.
A vertically arranged combined type valve core 9 is arranged in a valve core inserting cavity 34 of the flow regulating valve seat 10, the combined type valve core 9 is composed of a valve core main body 23 with a hollow structure, a valve core flow guide cavity 24 is arranged in the middle of the valve core main body 23, the upper end of the valve core flow guide cavity 24 is closed, and a flow guide outlet 26 is arranged at the lower end of the valve core flow guide cavity 24; and a pressure reducing cavity 17 is formed between the diversion outlet 26 at the lower end of the composite valve core 9 and the lower end of the valve core plug-in cavity 34 of the flow regulating valve seat 10. The side wall of the upper part of the valve core diversion cavity 24 is provided with a valve core reducing hole group 25 which is communicated with the inner cavity of the flow regulating cage 8 and the aperture of which is gradually increased from top to bottom. The upper portion of the case main part 23 of combined type case 9 is provided with scour protection connector 27, and the upper portion activity cover of scour protection connector 27 is equipped with scour protection sheath 28, and scour protection sheath 28 links to each other with scour protection connector 27 through connecting parallel key 29 to prevent scour protection sheath 28 in the rotation of protecting against shock lift in-process. Meanwhile, a disc spring pressing ring 31 is arranged at the root part of the lower end of the driving valve rod 11 arranged above the anti-impact sheath 28; a disc spring 30 is arranged between the lower side surface of the disc spring pressing ring 31 and the upper side surface of the anti-impact sheath 28; an impingement cavity 16 is formed between the impingement sheath 28 and the lower end of the cage through cavity 20 of the flow regulating cage 8. In addition, a valve core sealing surface 32 formed by overlaying stellite hard alloy (such as cobalt chromium tungsten hard alloy) is arranged at the position where the anti-impact connector 27 is connected with the valve core main body 23; the valve element sealing surface 32 of the composite valve element 9 is connected in a sealing manner with the valve seat sealing surface 39 of the flow control valve seat 10. Therefore, the erosion-proof sheath 28 can counteract the scouring force which increases the medium flow speed due to the pressure reduction effect when the small flow flows by means of the up-and-down movement mode of the elastic force of the disc spring 30, and the composite valve core is further effectively protected.
A driving valve rod 11 arranged at the upper part of the composite valve core 9 passes through the upper end of a through hole in the middle of the valve cover 2 and is connected with a driving device (such as an electric actuator) arranged on a supporting frame 14. Meanwhile, a positioning sealing sleeve 12 is arranged between the driving valve rod 11 and the lower end part of the through hole in the middle of the valve cover 2; and a sealing filler 13 made of graphite or polytetrafluoroethylene material is arranged between the driving valve rod 11 and the upper end part of the through hole in the middle of the valve cover 2 so as to improve the sealing performance of the sealing cover. The support frame 14 is also provided with a damping device 15, the damping device 15 comprises a valve rod nut arranged at the upper end part of the driving valve rod 11, the valve rod nut is arranged inside the support frame 14, and the upper part of the valve rod nut is connected with the top of the support frame 14 through a disc spring 30; in the process that the driving device drives the valve rod nut and the composite valve core 9 to act rapidly, the vibration is reduced by sliding the valve rod nut at the end part of the driving valve rod 11; the disc spring can also effectively buffer the impact force of the repeated movement of the drive valve rod 11.
The cage variable diameter hole group 21 of the flow regulating cage 8, the valve core variable diameter hole group 25 of the combined valve core 9 and the valve seat variable diameter hole group 36 of the flow regulating valve seat 10 are correspondingly matched with each other, and the hole diameter of each hole group is arranged according to the flow characteristic of the regulating valve. The flow characteristics include linear, equal percentage, and parabolic characteristics. The relative stroke and the relative flow of the linear characteristic are in a linear relation, and the flow change caused by the change of the unit stroke is invariable; when the flow rate is large, the flow rate relative value changes little, and when the flow rate is small, the flow rate relative value changes greatly. The relative stroke and the relative flow with equal percentage characteristics are not in a linear relation, and at each point of the stroke, the flow change caused by unit stroke change is in direct proportion to the flow at the point, and the percentage of the flow change is equal; its advantages are small flow, small flow variation and large flow variation, i.e. same regulation precision at different opening degrees. The parabolic characteristic of the flow varies quadratically, proportional to the stroke, with roughly the middle of the linear and equal percentage characteristics.
When the micro-control combined type regulating valve is used, the micro-control combined type regulating valve is arranged at an outlet of a conveying pipeline for special media such as steam, high-pressure water and the like, when the micro-control combined type regulating valve is in small-flow operation, the driving device drives the driving valve rod 11 and the combined type valve core 9 to move upwards, so that the valve is opened, the media enter the guide cavity 4 of the regulating valve from the valve inlet 3, the media are accelerated, and the media can quickly enter the flow equalizing cavity 5, so that the media uniformly pass through the flow regulating cage cover 8. Flows into the flow regulating cage 8 through the cage reducing hole group 21 to enter the medium, enters the valve core flow guide cavity 24 through the anti-impact cavity 16 and the valve core reducing hole group 25 of the composite valve core 9, and offsets the scouring force of the medium with high flow velocity when the medium flows with small flow by utilizing the up-and-down moving mode of the anti-impact sheath 28 by means of the elasticity of the disc spring 30, thereby protecting the composite valve core. The medium flowing out from the diversion outlet 26 of the composite valve core 9 flows into the mixing cavity 6 through the valve seat reducing hole group 36 of the flow regulating valve seat 10 and is discharged from the valve outlet 7; and the anti-scouring boss 38 of the flow regulating valve seat 10 can avoid scouring damage to the sealing surface of the valve seat caused by the action force of the medium, and effectively prolongs the service life of the regulating valve.
Claims (5)
1. The utility model provides a micro-control combined type governing valve, includes valve body (1), and the upper end of valve body (1) is provided with valve gap (2), its characterized in that: a valve inlet (3) is formed in one side of the valve body (1), the valve inlet (3) is communicated with a flow equalizing chamber (5) in the middle of the valve body (1) through a guide chamber (4) which is obliquely arranged, a flow adjusting cage (8) is arranged in the flow equalizing chamber (5), a flow adjusting valve seat (10) is arranged on the lower portion of the flow adjusting cage (8), the flow adjusting valve seat (10) is located in a mixing chamber (6) in the lower portion of the valve body (1), and the mixing chamber (6) is connected with a valve outlet (7) formed in the other side of the valve body (1); a composite valve core (9) which is vertically arranged is also arranged in the flow regulating valve seat (10), a driving valve rod (11) is arranged at the upper end of the composite valve core (9), and the driving valve rod (11) penetrates through the upper end of a through hole in the middle of the valve cover (2) and is connected with a driving device arranged on a support frame (14); a positioning sealing sleeve (12) is arranged between the driving valve rod (11) and the lower end part of the middle through hole of the valve cover (2), and a sealing filler (13) is arranged between the driving valve rod (11) and the upper end part of the middle through hole of the valve cover (2).
2. The micro-control composite regulating valve according to claim 1, wherein: flow control cage cover (8) that set up in valve body (1) homoflow chamber (5) comprise cage cover main part (19), and the middle part of cage cover main part (19) is provided with cage cover logical chamber (20), is provided with cage cover reducing punch combination (21) that are linked together with homoflow chamber (5) on the lower part lateral wall of cage cover main part (19), the outside on cage cover main part (19) upper portion and the pore wall fixed connection of homoflow chamber (5) top.
3. The micro-control composite regulating valve according to claim 1, wherein: the flow regulating valve seat (10) is composed of a valve seat main body (33), a valve core inserting cavity (34) is arranged in the middle of the valve seat main body (33), a valve core inserting opening (35) is formed in the upper end of the valve core inserting cavity (34), a valve seat sealing surface (39) is arranged at the opening of the valve core inserting opening (35), and the lower end of the valve core inserting cavity (34) is closed; a valve seat variable diameter hole group (36) communicated with the mixing cavity (6) is arranged on the side wall of the lower part of the valve core inserting cavity (34); the upper part of the valve seat main body (33) is provided with a valve seat connecting part (37) which is used for being connected with the convex edge of the hole wall above the mixing cavity (6), and the valve seat connecting part (37) is also provided with an anti-impact boss (38).
4. The micro-control composite regulating valve according to claim 1, wherein: the composite valve core (9) arranged in the flow regulating valve seat (10) is composed of a valve core main body (23), a valve core flow guide cavity (24) is arranged in the middle of the valve core main body (23), the upper end of the valve core flow guide cavity (24) is closed, and a flow guide outlet (26) is arranged at the lower end of the valve core flow guide cavity (24); a valve core reducing hole group (25) communicated with the inner cavity of the flow regulating cage (8) is arranged on the side wall of the upper part of the valve core flow guide cavity (24); an anti-impact connector (27) is arranged on the upper portion of the valve core main body (23), an anti-impact sheath (28) is movably sleeved on the upper portion of the anti-impact connector (27), a disc spring pressing ring (31) is arranged at the root of the driving valve rod (11) above the anti-impact sheath (28), and a disc spring (30) is arranged between the lower side surface of the disc spring pressing ring (31) and the upper side surface of the anti-impact sheath (28); furthermore, a valve core sealing surface (32) is arranged at the part where the anti-impact connecting body (27) is connected with the valve core main body (23).
5. The micro-control composite regulating valve according to claim 1, wherein: still be provided with damping device (15) on support frame (14), damping device (15) are including setting up the valve-stem nut who drives valve rod (11) upper end, and valve-stem nut sets up the inside at support frame (14), and valve-stem nut's upper portion links to each other through belleville spring and support frame (14) top.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020141689.0U CN211624244U (en) | 2020-01-22 | 2020-01-22 | Micro-control combined regulating valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020141689.0U CN211624244U (en) | 2020-01-22 | 2020-01-22 | Micro-control combined regulating valve |
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| CN211624244U true CN211624244U (en) | 2020-10-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020141689.0U Active CN211624244U (en) | 2020-01-22 | 2020-01-22 | Micro-control combined regulating valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404461A (en) * | 2021-07-06 | 2021-09-17 | 成都百胜野牛科技有限公司 | Inner core protection structure of intelligent flow regulator of natural gas well |
| CN114233532A (en) * | 2021-12-30 | 2022-03-25 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
| CN114542738A (en) * | 2022-03-11 | 2022-05-27 | 西安热工研究院有限公司 | Micro-hole type flow electric regulating valve |
| CN115448397A (en) * | 2022-09-29 | 2022-12-09 | 中国科学院武汉病毒研究所 | Continuous wastewater treatment device and method with accurate and stable temperature control |
-
2020
- 2020-01-22 CN CN202020141689.0U patent/CN211624244U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113404461A (en) * | 2021-07-06 | 2021-09-17 | 成都百胜野牛科技有限公司 | Inner core protection structure of intelligent flow regulator of natural gas well |
| CN114233532A (en) * | 2021-12-30 | 2022-03-25 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
| CN114233532B (en) * | 2021-12-30 | 2023-11-03 | 亚普汽车部件股份有限公司 | Flexible electric control valve, electric control fuel system and control method of electric control valve |
| CN114542738A (en) * | 2022-03-11 | 2022-05-27 | 西安热工研究院有限公司 | Micro-hole type flow electric regulating valve |
| CN115448397A (en) * | 2022-09-29 | 2022-12-09 | 中国科学院武汉病毒研究所 | Continuous wastewater treatment device and method with accurate and stable temperature control |
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