CN216045661U - Four-stage pressure reduction regulating valve - Google Patents
Four-stage pressure reduction regulating valve Download PDFInfo
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- CN216045661U CN216045661U CN202023340092.8U CN202023340092U CN216045661U CN 216045661 U CN216045661 U CN 216045661U CN 202023340092 U CN202023340092 U CN 202023340092U CN 216045661 U CN216045661 U CN 216045661U
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Abstract
The utility model relates to the technical field of regulating valve structures, which is used for prolonging the service life of a regulating valve, in particular to a four-stage pressure reduction regulating valve, which comprises a valve body assembly, wherein the valve body assembly comprises a valve seat, an integrated valve core and a valve rod and a valve cage, the upper end of the valve body assembly is connected with a valve cover through a bolt component, an inlet flow passage, an inlet buffer inner cavity, an outlet buffer inner cavity and an outlet flow passage are arranged in the valve body assembly, and a first pressure reduction area is the inlet buffer inner cavity; the second pressure reducing area is a first buffer flow channel arranged on the valve seat, and a flow channel small hole is arranged at the lower end of the valve seat; the valve core comprises a first valve core and a second valve core, and the third decompression area comprises a second buffer flow passage arranged on a valve seat between the first valve core and the second valve core; the fourth decompression area comprises a labyrinth structure with a plurality of layers of small holes and runners arranged on the valve cage; through the four-stage depressurization treatment, the problems of scouring, cavitation, vibration and the like of the valve in the high pressure difference work process and inconvenience in maintenance are solved, and the service life of the valve can be greatly prolonged.
Description
Technical Field
The utility model relates to the technical field of regulating valve structures, and particularly relates to a four-stage pressure reduction regulating valve for prolonging the service life of the regulating valve.
Background
The valve is a control part in a fluid conveying system and has the functions of diversion, interception, regulation, throttling, backflow prevention, diversion or overflow pressure relief and the like.
The existing throttle valve is usually composed of a valve body, a lower valve body, a valve core and a valve cage seat, in the using process of a conventional regulating valve, only micro flow regulation is needed under certain high pressure difference or conventional working conditions, but under the condition, cavitation and flash evaporation conditions are easy to occur to media, scouring can be caused to the sealing surface of the valve inner part, meanwhile, the cavitation and flash evaporation conditions are also easy to cause oscillation of the valve inner part, and the regulating performance, the sealing effect and the service life of the valve inner part can be greatly reduced.
SUMMERY OF THE UTILITY MODEL
The utility model provides a governing valve is low, sealed effect is not good, the short problem of life to governing valve among the prior art is easily washed away, cavitation, causes the regulating valve, and this application provides a level four step-down governing valve, through level four step-down processing in the use, the effectual valve of having solved when the poor during operation of high pressure erode, cavitation, vibration scheduling problem and maintenance inconvenience to the life of improvement valve that can be great.
In order to achieve the purpose, the utility model provides a four-stage depressurization regulating valve which comprises a valve body assembly, wherein the valve body assembly comprises a valve seat, a valve core, a valve rod and a valve cage, the upper end of the valve body assembly is connected with a valve cover through a bolt assembly, an inlet flow passage, an inlet buffer inner cavity, an outlet buffer inner cavity and an outlet flow passage are formed in the valve body assembly, and a first depressurization area is the inlet buffer inner cavity; the second pressure reducing area is a first buffer flow channel arranged on the valve seat, and a flow channel small hole is arranged at the lower end of the valve seat; the valve core comprises a first valve core and a second valve core, and the third decompression area comprises a second buffer flow passage arranged on a valve seat between the first valve core and the second valve core; the fourth decompression area comprises a labyrinth structure with a plurality of layers of small holes and flow passages arranged on the valve cage.
According to the technical scheme, the four pressure reducing areas are arranged, wherein the inlet channel is properly reduced by calculating the flow in the first pressure reducing area, so that a throttling effect is achieved to a certain degree; when the medium enters the buffering inner cavity arranged on the valve body assembly, an effective buffering effect can be achieved; the lower end of the valve seat of the second pressure reducing area is provided with a proper small flow passage hole, and a medium enters the second-stage throttling pressure reducing area through the small flow passage hole to mix flow, so that the flowing direction of the medium is more uniform, the eccentric wear of the valve core is reduced, and the pressure reducing effect is realized again; the flow rate of the third decompression area is adjusted through the distance between the head of the first valve core and the head of the second valve core, a second buffer flow channel is arranged on the valve seat, and the medium is throttled and decompressed again when passing through the sealing surface of the valve core and the valve seat; the valve cage is provided with a plurality of layers of small holes and flow passages in the fourth decompression area, so that a medium is not easy to generate instantaneous explosive force from high pressure to low pressure when passing through the valve seat and the valve core sealing surface, the sealing surfaces of the valve core and the valve seat are effectively protected, and the service life is prolonged.
The inlet flow channel properly reduces the drift diameter by calculating the flow, the buffer inner cavity is as large as possible, and the medium enters the buffer cavity to effectively release energy.
The utility model provides an inlet flow channel's entrance position is angle of declination, because the use pressure differential of this valve is great, the velocity of flow of medium is high, lets the first point of scouring of medium put on the casing that does not play the sealing effect, and the valve body adopts the forging of special design, and the valve body increase 1/3 of the ordinary valve of the same specification, increases the valve pocket volume when casing wall thickness thickening to guarantee that the buffering region satisfies the use.
The valve core and the valve rod are processed by adopting an integral material, the strength of the valve core is better, the guiding is more stable and reliable, the valve rod part adopts a body modification processing technology, the surface smoothness of the valve rod can reach Ra of less than or equal to 0.08 mu m, the surface hardness is improved by 20% -45%, the valve rod is not easy to wear, and the resistance is small when the valve rod moves up and down; the valve core, the valve body, the valve seat and the stuffing box are all arranged on the same central dot, so that the valve core cannot be clamped in the adjusting process, the sealing performance is better, and the service life is longer.
Further, the bolt assembly comprises bolt holes formed in the valve body assembly and the valve cover, bolts matched and locked with the bolt holes are connected in the bolt holes, and nuts are connected on the bolts.
This application passes through bolt assembly with valve body assembly and valve gap connection, both can make fixed effect between the two better, also can be convenient for when needs maintain whole structure, dismantle and install valve body assembly and valve gap.
Furthermore, the 1/4 circle of the lower end of the valve seat, which is opposite to the first buffer flow channel, is not provided with a flow channel small hole.
This application sets up the aperture that satisfies the flow at the regional lower extreme of buffering of disk seat lower extreme, just does not bore the aperture to import one end (1/4 circle), prevents that the medium from directly scouring the valve core head, and the regional extension of buffering makes the medium form the mixed flow in the buffering region, changes the flow direction of medium, can realize letting the steady effect through first valve core head of medium.
Furthermore, the flow area of the inlet buffer inner cavity is 3 times larger than that of the inlet flow passage.
The application accomplishes to be greater than 3 times of inlet flow channel with buffering inner chamber flow area more than, when the medium entered into this region, can effectually play the effect of buffering.
Further, the valve seat is a free-standing valve seat.
The valve seat is arranged to be an independent valve seat, so that the valve seat is convenient to disassemble and simple to maintain; and the valve seat adopts a two-stage pressure reduction structure: in the first stage, the lowest end of the valve seat is provided with a large buffer area, the lower end of the buffer area at the lower end of the valve seat is provided with a small hole meeting the flow rate, and the small hole is not drilled at the end (1/4 circles) opposite to the inlet, so that a medium is prevented from directly flushing the head part of the valve core, the buffer area is lengthened, the medium forms mixed flow in the buffer area, the flow direction of the medium is changed, and the medium stably passes through the head part of the first valve core; the second level adopts the double-valve-core structure, and the double-valve-core head can effectually slow down the velocity of flow of medium to be equipped with buffer area at first valve core head and second valve core head, play the effect of effectual speed reduction decompression once more, make its medium flow direction and speed more steady through the valve seal face, reduce the harm to sealed face.
Furthermore, the valve cage, the valve seat, the valve core, the valve body assembly and the valve cover are all arranged on the same central dot.
This application all sets up valve cage and disk seat, case, valve body assembly, valve gap on same center dot, has guaranteed holistic concentricity, guarantees the stationarity of case in the motion process.
Furthermore, the valve body assembly is sealed by adopting a laminated metal winding seal.
The valve body in this application is sealed to adopt and fold pressure-superposed type metal winding and seal, simple structure, and is sealed effectual, conveniently tears open and examines.
Furthermore, a plurality of layers of small holes and flow passages are formed in the valve cage.
According to the valve, the multilayer small holes and the flow channels are formed in the valve cage of the fourth decompression area, so that a medium is difficult to cause instant explosive force from high pressure to low pressure when passing through the valve seat and the valve core sealing surface, and the effect of protecting the sealing surface of the valve core and the valve seat is effectively achieved.
In summary, compared with the prior art, the utility model has the following beneficial effects:
(1) the four-stage depressurization regulating valve effectively solves the problems of scouring, cavitation, vibration and the like of the valve during high pressure difference work and the inconvenience during maintenance, and can greatly prolong the service life of the valve;
(2) the inlet position of the inlet flow channel of the valve is inclined downwards, because the valve is large in using pressure difference and high in medium flow rate, a first scouring point of the medium is placed on a shell which does not play a role in sealing, the valve body is made of a specially designed forging, 1/3 is increased compared with the valve body of a common valve with the same specification, the wall thickness of the shell is thickened, and meanwhile, the volume of a valve cavity is increased, so that a buffer area is guaranteed to meet the use requirement;
(3) the valve body assembly and the valve cover are connected through the bolt assembly, so that the fixing effect between the valve body assembly and the valve cover is better, and the valve body assembly and the valve cover can be conveniently disassembled and assembled when the whole structure needs to be maintained;
(4) according to the valve core, the lower end of a buffering area at the lower end of the valve seat is provided with a small hole meeting the flow rate, and the small hole is not drilled at the end (1/4 round) facing an inlet, so that a medium is prevented from directly scouring the head part of the valve core, the buffering area is lengthened, the medium forms mixed flow in the buffering area, the flowing direction of the medium is changed, and the effect that the medium can stably pass through the head part of the first valve core can be realized;
(5) the flow area of the buffer inner cavity is more than 3 times larger than that of the inlet flow channel, and when a medium enters the area, the buffer effect can be effectively achieved;
(6) the valve seat is arranged to be an independent valve seat, so that the valve seat is convenient to disassemble and simple to maintain; and the valve seat adopts a two-stage pressure reduction structure: in the first stage, the lowest end of the valve seat is provided with a large buffer area, the lower end of the buffer area at the lower end of the valve seat is provided with a small hole meeting the flow rate, and the small hole is not drilled at the end (1/4 circles) opposite to the inlet, so that a medium is prevented from directly flushing the head part of the valve core, the buffer area is lengthened, the medium forms mixed flow in the buffer area, the flow direction of the medium is changed, and the medium stably passes through the head part of the first valve core; in the second stage, a double-valve-core structure is adopted, the head parts of the double valve cores can effectively slow down the flow velocity of the medium, and buffer areas are arranged at the head parts of the first valve core and the second valve core to play a role in effectively reducing the speed and pressure again, so that the medium flows in the direction and the speed more stably and passes through the sealing surface of the valve, and the damage to the sealing surface is reduced;
(7) according to the valve, the valve cage, the valve seat, the valve core, the valve body assembly and the valve cover are all arranged on the same central circular point, so that the integral concentricity is ensured, and the stability of the valve core in the movement process is ensured;
(8) the valve core and the valve rod are processed by adopting an integral material, the strength of the valve core is better, the guiding is more stable and reliable, the valve rod part adopts a body modification processing technology, the surface smoothness of the valve rod can reach Ra of less than or equal to 0.08 mu m, the surface hardness is improved by 20% -45%, the valve rod is not easy to wear, and the resistance is small when the valve rod moves up and down; the valve core, the valve body, the valve seat and the stuffing box are all arranged on the same central dot, so that the valve core cannot be clamped in the adjusting process, the sealing performance is better, and the service life is longer;
(9) the valve body seal in the application adopts the laminated metal winding seal, the structure is simple, the sealing effect is good, and the disassembly and the inspection are convenient;
(10) according to the valve, the multilayer small holes and the flow channels are formed in the valve cage of the fourth decompression area, so that a medium is difficult to cause instant explosive force from high pressure to low pressure when passing through the valve seat and the valve core sealing surface, and the effect of protecting the sealing surface of the valve core and the valve seat is effectively achieved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a four-stage pressure reducing regulating valve according to the present invention;
FIG. 2 is a schematic view of the first pressure reducing section of a four-stage pressure reducing regulator valve of the present invention;
FIG. 3 is a schematic diagram of the second pressure reducing section of a four-stage pressure reducing regulator valve of the present invention;
FIG. 4 is a schematic diagram of the third pressure reducing section of a four-stage pressure reducing regulator valve of the present invention;
FIG. 5 is a schematic diagram of the fourth pressure reducing section of a four-stage pressure reducing regulator valve of the present invention;
FIG. 6 is a cross-sectional view of a cage of a four-stage pressure reducing regulator valve of the present invention.
Labeled as: the valve comprises a valve body assembly 01, an inlet flow passage 01-1, an inlet buffer inner cavity 01-2, an outlet buffer inner cavity 01-3, an outlet flow passage 01-4, a valve seat 02, a first buffer flow passage 02-1, a second buffer flow passage 02-2, flow passage small holes 02-3, an integrated valve core and valve rod 03, a first valve core 03-1, a second valve core 03-2, a valve cage 04, a 04-1 multilayer small hole, a valve cover 05 and a nut 06.
Detailed Description
All features disclosed in this specification may be combined in any combination, except features and/or steps that are mutually exclusive.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to fig. 1 to 6 and specific examples.
Example 1
Referring to fig. 1-6, the four-stage pressure reduction regulating valve provided by the utility model comprises a valve body assembly 01, wherein the valve body assembly 01 comprises a valve seat 02, an integrated valve core and valve rod 03 and a valve cage 04, the upper end of the valve body assembly 01 is connected with a valve cover 05 through a bolt component, an inlet flow passage 01-1, an inlet buffer inner cavity 01-2, an outlet buffer inner cavity 01-3 and an outlet flow passage 01-4 are formed in the valve body assembly 01, and a first pressure reduction area is the inlet buffer inner cavity 01-2; the second pressure reducing area is a first buffer flow channel 02-1 arranged on the valve seat 02, and a flow channel small hole 02-3 is arranged at the lower end of the valve seat 02; the valve core 03 comprises a first valve core 03-1 and a second valve core 03-2, and the third decompression area comprises a second buffer flow passage 02-2 arranged on a valve seat 02 between the first valve core 03-1 and the second valve core 03-2; the fourth decompression area comprises a labyrinth structure with a plurality of layers of small holes and flow passages arranged on the valve cage.
According to the technical scheme, the four pressure reducing areas are arranged, wherein the inlet channel 01-1 is properly reduced by calculating the flow in the first pressure reducing area, so that a throttling effect is achieved to a certain degree; when the medium enters the buffering inner cavity arranged on the valve body assembly 01, an effective buffering effect can be achieved; the lower end of the valve seat 02 of the second pressure reducing area is provided with a proper flow passage small hole 02-3, and a medium enters the secondary throttling pressure reducing area through the flow passage small hole 02-3 to be mixed, so that the flowing direction of the medium is more uniform, the eccentric wear of the integrated valve core and valve rod 03 is reduced, and the pressure reducing effect is realized again; the flow rate of the third decompression area is adjusted through the distance between the head of the first valve core 03-1 and the head of the second valve core 03-2, a second buffer flow passage 02-2 is arranged on the valve seat 02, and the medium is throttled and decompressed again when passing through the sealing surface of the valve rod 03 and the valve seat 02 of the integrated valve core; the valve cage is provided with a plurality of layers of small holes and flow passages in the fourth pressure reduction area, so that a medium is difficult to generate instantaneous explosive force from high pressure to low pressure when passing through the valve seat 02 and the integrated valve core and valve rod 03 sealing surface, sealing is effectively protected, and the service life is prolonged.
The inlet flow channel 01-1 properly reduces the drift diameter by calculating the flow, the buffer inner cavity is as large as possible, and the medium enters the buffer cavity to effectively release energy.
The utility model provides an inlet flow channel 01-1's import position is angle of declination, because the use pressure differential of this valve is great, the velocity of flow of medium is high, lets the first point of erodeing of medium put on the casing that does not play the sealing effect, and the valve body adopts the forging of special design, and the valve body increase 1/3 of the ordinary valve of the same specification, increases the valve pocket volume when the casing wall thickness thickening to guarantee that the buffering region satisfies the use.
The valve core and the valve rod are processed by adopting an integral material, the strength of the valve core is better, the guiding is more stable and reliable, the valve rod part adopts a body modification processing technology, the surface smoothness of the valve rod can reach Ra of less than or equal to 0.08 mu m, the surface hardness is improved by 20% -45%, the valve rod is not easy to wear, and the resistance is small when the valve rod moves up and down; the valve core, the valve body, the valve seat and the stuffing box are all arranged on the same central dot, so that the valve core cannot be clamped in the adjusting process, the sealing performance is better, and the service life is longer.
Example 2
Based on embodiment 1, referring to fig. 1-6, the bolt assembly of this embodiment includes bolt holes disposed on the valve body assembly 01 and the valve cover 05, a bolt engaged with the bolt holes is connected in the bolt hole, and a nut 06 is connected on the bolt.
This application passes through bolt assembly with valve body assembly 01 and valve gap connection, both can make fixed effect between the two better, also can be convenient for when needs maintain whole structure, dismantle and install valve body assembly 01 and valve gap 05.
Example 3
Referring to fig. 1-6 based on example 1, the 1/4 circle facing the first buffer flow passage 02-1 of this example is not provided with a flow passage orifice 02-3.
The small hole that satisfies the flow is set up to the buffer zone lower extreme of disk seat 02 lower extreme to this application, just does not bore the aperture to import one end (1/4 circles), prevents that the medium from directly scouring the integral type case valve rod 03 head, and buffer zone extension can realize letting the steady effect through first case 03-1 head of medium.
Example 4
Based on the embodiment 1, referring to fig. 1-6, the flow area of the inlet buffer cavity 01-2 of the embodiment is larger than 3 times of the inlet flow passage 01-1.
The flow area of the buffering inner cavity is made to be more than 3 times larger than that of the inlet flow channel 01-1, and when a medium enters the area, the buffering effect can be effectively achieved.
Example 5
Based on embodiment 1, referring to fig. 1-6, the valve seat 02 of this embodiment is a free standing valve seat 02.
According to the valve seat 02, the valve seat 02 is arranged to be an independent valve seat 02, so that the valve seat is convenient to disassemble and simple to maintain; and valve seat 02 adopts the two-stage pressure reduction structure: in the first stage, the lowest end of the valve seat 02 is provided with a large buffer area, the lower end of the buffer area at the lower end of the valve seat 02 is provided with a small hole meeting the flow, the small hole is not drilled at the end (1/4 circles) opposite to the inlet, the medium is prevented from directly scouring the head part of the valve core, the buffer area is lengthened, and the medium can stably pass through the head part of the first valve core 03-1; and in the second stage, a double-valve-core structure is adopted, the head parts of the double valve cores can effectively slow down the flow velocity of the medium, and buffer areas are arranged at the head parts of the first valve core 03-1 and the second valve core 03-2 to play a role in reducing the speed and pressure again, so that the medium flows to the valve sealing surface and the speed is more stable, and the damage to the sealing surface is reduced.
Example 6
Based on embodiment 1, referring to fig. 1-6, the valve cage 04 of this embodiment is located on the same center dot point as the valve seat 02, the integrated valve core and valve rod 03, the valve body assembly 01, and the valve cover 05.
This application all sets up valve cage and disk seat 02, integral type case valve rod 03, valve body assembly 01, valve gap 05 on same central dot, has guaranteed holistic concentricity, guarantees the stationarity of case in the motion process.
The valve core and the valve rod are processed by adopting an integral material, the strength of the valve core is better, the guiding is more stable and reliable, the valve rod part adopts a body modification processing technology, the surface smoothness of the valve rod can reach Ra of less than or equal to 0.08 mu m, the surface hardness is improved by 20% -45%, the valve rod is not easy to wear, and the resistance is small when the valve rod moves up and down; the valve core, the valve body, the valve seat and the stuffing box are all arranged on the same central dot, so that the valve core cannot be clamped in the adjusting process, the sealing performance is better, and the service life is longer.
Example 7
Based on embodiment 1, referring to fig. 1-6, the seal of the valve body assembly 01 of this embodiment is a laminated metal wound seal.
The valve body in this application is sealed to adopt and fold pressure-superposed type metal winding and seal, simple structure, and is sealed effectual, conveniently tears open and examines.
Example 8
Referring to fig. 1 to 6, a valve cage 04 according to this embodiment is provided with a plurality of layers of small holes 04-1 and flow passages, based on embodiment 1.
According to the valve, the valve cage 04 in the fourth decompression area is provided with the plurality of layers of small holes 04-1 and the flow channel, so that a medium is difficult to generate instantaneous explosive force from high pressure to low pressure when passing through the valve seat and the valve core sealing surface, and the effect of protecting the sealing surface of the valve core and the valve seat is effectively realized.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (8)
1. A four-stage depressurization regulating valve comprises a valve body assembly (01), wherein the valve body assembly (01) comprises a valve seat (02), an integrated valve core and valve rod and a valve cage (04), the upper end of the valve body assembly (01) is connected with a valve cover (05) through a bolt assembly, the four-stage depressurization regulating valve is characterized in that an inlet flow channel (01-1), an inlet buffer inner cavity (01-2), an outlet buffer inner cavity (01-3) and an outlet flow channel (01-4) are formed in the valve body assembly (01), and a first depressurization area is the inlet buffer inner cavity (01-2); the second decompression area is a first buffer flow channel (02-1) arranged on the valve seat (02), and a flow channel small hole (02-3) is arranged at the lower end of the valve seat (02); the valve core (03) comprises a first valve core (03-1) and a second valve core (03-2), and the third decompression area comprises a second buffer flow channel (02-2) arranged on a valve seat (02) between the first valve core (03-1) and the second valve core (03-2); the fourth decompression area comprises a labyrinth structure with a plurality of layers of small holes and flow passages arranged on the valve cage (04).
2. The four-stage pressure reducing regulating valve according to claim 1, wherein the bolt assembly comprises bolt holes arranged on the valve body assembly (01) and the valve cover (05), a bolt matched and locked with the bolt holes is connected in the bolt holes, and a nut (06) is connected on the bolt.
3. The four-stage pressure reducing regulating valve according to claim 1, wherein no flow passage small hole (02-3) is formed on the 1/4 circle which is opposite to the first buffer flow passage (02-1).
4. The four-stage pressure reducing regulating valve according to claim 1, wherein the flow area of the inlet buffer cavity (01-2) is more than 3 times of the inlet flow passage (01-1).
5. The four-stage pressure reducing regulating valve according to claim 1, wherein the valve seat (02) is a free-standing valve seat (02).
6. The four-stage pressure reducing regulating valve according to claim 1, wherein the valve cage (04) is located on the same central circular point as the valve seat (02), the integrated valve core and valve rod, the valve body assembly (01) and the valve cover (05).
7. The four-stage pressure reducing regulating valve according to claim 1, wherein the sealing of the valve body assembly (01) adopts a laminated metal winding sealing.
8. The four-stage pressure reducing regulating valve according to claim 1, wherein the valve cage (04) is provided with a plurality of layers of small holes (04-1) and flow passages.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023340092.8U CN216045661U (en) | 2020-12-31 | 2020-12-31 | Four-stage pressure reduction regulating valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023340092.8U CN216045661U (en) | 2020-12-31 | 2020-12-31 | Four-stage pressure reduction regulating valve |
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| CN216045661U true CN216045661U (en) | 2022-03-15 |
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| CN202023340092.8U Active CN216045661U (en) | 2020-12-31 | 2020-12-31 | Four-stage pressure reduction regulating valve |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645692A (en) * | 2022-05-23 | 2022-06-21 | 德州联合石油科技股份有限公司 | Wellhead Christmas tree throttle valve core and throttle valve |
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2020
- 2020-12-31 CN CN202023340092.8U patent/CN216045661U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114645692A (en) * | 2022-05-23 | 2022-06-21 | 德州联合石油科技股份有限公司 | Wellhead Christmas tree throttle valve core and throttle valve |
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