Axial flow control valve

Abstract

An axial flow flow control valve includes: a valve body, a valve core, a valve seat and a driving device; the valve core is fixedly arranged in the valve body to form an annular fluid channel with the valve body, the valve seat is tubular and sealed to the inner wall of the valve body, the valve body, the valve core and the valve seat are coaxially arranged, and the driving device is used to drive the valve seat to move along the axial direction of the valve body so as to connect or separate with the valve core, thereby closing or opening the flow control valve. The axial flow flow control valve of the present invention drives the valve seat to move through the driving device, so that the valve seat connects or separates with the valve core, thereby closing or opening the flow control valve. It avoids the problems of the overall shape of the throttling component being unstable, flow separation, and increased flow resistance caused by the driving device driving the valve core to move in the prior art.

Description

Technical Field

[0001] The invention relates to the field of flow control, and in particular to an axial flow type flow control valve. Background Art

[0002] The control valve (also known as the regulating valve) is the terminal actuator of the control loop. It plays an important role in process control in the process industry, and it has also been a long-term technical weakness. The axial flow control valve developed by MMOKVELD solves the problems of poor maintenance performance, poor reliability, and poor durability of traditional angle valves, butterfly valves, ball valves, and sleeve valves.

[0003] The axial flow control valve is different from the conventional linear stroke control valve. It changes the overall flow structure of the conventional linear stroke control valve, changes the phenomenon that the throttling part of the conventional linear stroke control valve is inconsistent with the flow direction of the medium, reduces the energy loss of the medium, and increases the flow capacity by 20% to 50% compared with the conventional linear stroke control valve. It has the characteristics of low flow resistance coefficient, durability, low maintenance, and high performance. It is widely used in the regulation and control of natural gas, crude oil, refined oil and other non-corrosive gases and liquids. Relevant professional technicians and manufacturers at home and abroad have launched various axial flow control valves, such as US4638832, US2011 / 0017306A1, WO2019 / 20153A2, CN210770459U, etc.

[0004] The existing axial flow control valves generally have the following problems:

[0005] 1. The structure of the valve core destroys the rectifying effect of the throttling device. The valve core is often placed inside the throttling device, connected to a driving device composed of air pressure, hydraulic pressure or mechanical gear rack, and moves forward and backward along the axis of the flow pipe at the inlet or outlet of the valve body. The medium flow is adjusted by adjusting the relative position between the valve core and the valve seat set at the inlet and outlet. The uncertainty of the valve core position causes the overall shape of the throttling device to be unstable, and the transition between the valve core and the throttling device is not smooth, resulting in flow separation, thereby increasing negative effects such as flow resistance.

[0006] 2. The valve core drive mechanism is often placed in the throttling device, which makes the throttling device look very large and bulky, and the fluid mechanics performance is negatively affected. At the same time, in order to connect with the actuator outside the valve body, a sufficiently large connecting channel must be set between the throttling device and the pipe wall, which further increases the flow resistance and affects the flow state of the medium in the pipeline.

[0007] 3. The fluid mechanics structure of the throttling device in the valve body has not been fully optimized, and the flow guidance and drag reduction effect is not ideal.

[0008] 4. A "cage" coaxial with the valve core is set at the rear of the throttling device and the periphery of the valve core, that is, a number of guide holes or guide grooves are opened on the rear wall of the throttling device. After the medium in the pipe flows through the throttling device, it flows out from the guide holes or grooves not covered by the valve core. The medium flow in the pipeline is controlled by controlling the degree of covering of the valve core on the cage. The design of the cage can reduce noise and vibration to a certain extent, but at the same time it will increase the flow resistance and increase the pressure loss in the pipeline.

[0009] Therefore, it is expected to develop a new type of axial flow control valve to at least partially overcome the above problems. Summary of the invention

[0010] The purpose of the present invention is to provide an axial flow flow control valve to optimize the flow state of the medium in the control valve and reduce the flow resistance.

[0011] The present invention provides an axial flow flow control valve, comprising: a valve body, a valve core, a valve seat and a driving device; the valve body is tubular, the valve core comprises a head portion, a middle portion and a tail portion connected in sequence, the valve core is fixedly arranged in the valve body, and an annular fluid channel is formed between the valve body and the valve body; the valve seat is tubular, sealed and connected to the inner wall of the valve body, and the valve body, the valve core and the valve seat are coaxially arranged; the driving device is arranged outside the valve body, and is used to drive the valve seat to move along the axial direction of the valve body so as to connect with or separate from the valve core, thereby closing or opening the flow control valve.

[0012] Preferably, the valve core comprises a head portion, a middle portion and a tail portion which are connected in sequence;

[0013] The valve core is spindle-shaped or teardrop-shaped, the axial section of the head is arc-shaped or parabolic, and the middle part is a cylinder; or, the axial section of the head is arc-shaped or parabolic, the middle part is a cylinder, and the tail has the same shape as the head.

[0014] Preferably, the valve core comprises a head portion, a middle portion and a tail portion which are connected in sequence, the head portion and the tail portion are cones, the middle portion is a cylinder, and the cone angle of the head portion is greater than or equal to the cone angle of the tail portion.

[0015] Preferably, the valve seat is close to one end of the valve core, and the inner wall of the valve seat is a smooth curved surface;

[0016] When the valve seat is connected to the valve core, the inner wall of the valve seat is tangent to the outer surface of the valve core.

[0017] Preferably, annular sealing rings are respectively provided on the outer peripheries of both ends of the valve seat so as to be sealed and connected to the inner wall of the valve body.

[0018] Preferably, the driving device is arranged outside the valve body; a rack is provided on the periphery of the valve seat, and the driving device includes an actuator and a gear, the actuator is used to drive the gear, and the gear is drivingly connected to the rack.

[0019] Preferably, the outer periphery of the valve seat is provided with a thread, and the driving device comprises an actuator and a worm, the actuator is used to drive the worm, and the worm is drivingly connected to the thread.

[0020] Preferably, the driving device is arranged outside the valve body; the driving device includes an actuator and a pneumatic cylinder or a hydraulic cylinder, the actuator is used to drive the piston of the pneumatic cylinder or the hydraulic cylinder, and the piston rod of the pneumatic cylinder or the hydraulic cylinder is connected to the outer periphery of the valve seat.

[0021] Preferably, the axial flow control valve further comprises a plurality of support plates, wherein the plurality of support plates are evenly distributed along the circumference of the valve core, one end of the support plate is connected to the outer periphery of the valve core, and the other end is connected to the inner wall of the valve body.

[0022] Preferably, a high-pressure pressure-taking hole and a low-pressure pressure-taking hole are provided on the side wall of the valve body, the high-pressure pressure-taking hole is close to one end of the valve core facing the fluid inlet, and the low-pressure pressure-taking hole is close to the middle of the valve core;

[0023] The flow control valve further comprises a differential pressure flow meter, wherein a high pressure inlet end and a low pressure inlet section of the differential pressure flow meter are respectively connected to the high pressure taking hole and the low pressure taking hole to measure the flow rate;

[0024] The driving device is connected to the differential pressure flow meter, and drives the valve seat to move along the axial direction of the valve body according to the flow measured by the differential pressure flow meter, thereby realizing closed-loop control.

[0025] The beneficial effects of the present invention are:

[0026] 1. The valve core of the axial flow flow control valve is fixed, and the valve seat is connected to the driving device. Under the action of the driving device, it moves along the axial direction of the valve body to connect or separate with the valve core, so that the flow control valve is closed or opened, avoiding the problems of unstable overall shape of the throttling part, flow separation, increased flow resistance, etc. caused by the driving device driving the valve core to move in the prior art.

[0027] 2. The drive device is installed outside the valve body, which will not cause adverse interference to the flow state of the medium in the pipeline, and is also convenient for daily maintenance.

[0028] 3. The shape of the valve core has been optimized to minimize the flow resistance and ensure the rectification effect. When the medium flows through the valve core, there is almost no flow separation, which can reduce adverse effects such as noise and vibration. When the medium in the pipeline is liquid, the possibility of flash evaporation, cavitation and cavitation can be reduced. The shape of the valve seat has been optimized to minimize the flow resistance and avoid damage to the overall flow field.

[0029] 4. The dual throttle design of the valve core and valve seat provides great convenience for directly using the control valve itself to accurately measure the flow rate. Neither the valve core nor the valve seat adopts the valve cage or similar design in the prior art, which will not damage the linear shape of the axial flow channel in the valve body, thereby avoiding damage to the overall flow field.

[0030] 5. The support sheet firmly fixes the valve core on the axis of the valve body. Apart from this, no additional components are installed on the valve core, which can avoid adverse effects on the rectification effect of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The above and other objects, features and advantages of the present invention will become more apparent through a more detailed description of exemplary embodiments of the present invention in conjunction with the accompanying drawings, wherein like reference numerals generally represent like parts throughout the exemplary embodiments of the present invention.

[0032] Figure 1 A schematic structural diagram showing an axial flow control valve according to a first exemplary embodiment of the present invention;

[0033] Figure 2 A schematic diagram showing flow characteristics of an axial flow control valve according to a first exemplary embodiment of the present invention;

[0034] Figure 3 A schematic structural diagram showing an axial flow control valve according to a second exemplary embodiment of the present invention;

[0035] Figure 4 A schematic structural diagram showing an axial flow control valve according to a third exemplary embodiment of the present invention;

[0036] Figure 5 A schematic structural diagram showing an axial flow control valve according to a fourth exemplary embodiment of the present invention;

[0037] Figure 6 A schematic structural diagram showing an axial flow control valve according to a fifth exemplary embodiment of the present invention;

[0038] Figure 7 A schematic structural diagram showing an axial flow control valve according to a sixth exemplary embodiment of the present invention;

[0039] Figure 8A schematic structural diagram showing an axial flow control valve according to a seventh exemplary embodiment of the present invention.

[0040] Description of reference numerals:

[0041] 1 valve body, 2 valve core, 3 support plate, 4 valve seat, 5 sealing ring, 6a driving gear, 6b follower gear, 7 actuator, 8 worm, 9 hydraulic cylinder, 9a piston, 9b piston rod, 10 pressure taking hole, 11 differential pressure flowmeter. DETAILED DESCRIPTION

[0042] The present invention will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0043] The present invention provides an axial flow flow control valve, comprising: a valve body, a valve core, a valve seat and a driving device; the valve core is fixedly arranged in the valve body, and an annular fluid channel is formed between the valve core and the valve body; the valve seat is tubular and sealedly connected to the inner wall of the valve body; the valve body, the valve core and the valve seat are coaxially arranged; the driving device is used to drive the valve seat to move along the axial direction of the valve body so as to connect or separate with the valve core, thereby closing or opening the flow control valve.

[0044] The axial flow flow control valve of the present invention drives the valve seat to move by a driving device, so that the valve seat and the valve core are connected or separated, thereby closing or opening the flow control valve. The problems of unstable overall shape of the throttling part, flow separation, increased flow resistance, etc. caused by the driving device driving the valve core to move in the prior art are avoided. Example 1

[0045] Figure 1 A schematic diagram showing the structure of an axial flow control valve according to a first exemplary embodiment of the present invention is shown. Figure 1 As shown, the axial flow control valve comprises: a valve body 1, a valve core 2, a valve seat 4 and a driving device; the valve core 2 is fixedly arranged in the valve body 1 to form an annular fluid channel with the valve body 1, the valve seat 4 is tubular and sealedly connected to the inner wall of the valve body 1, the valve body 1, the valve core 2 and the valve seat 4 are coaxially arranged, and the driving device is used to drive the valve seat 4 to move along the axial direction of the valve body 1 so as to connect or separate with the valve core 2, thereby closing or opening the flow control valve.

[0046] The valve seat 4 is driven by the driving device to move, so that the valve seat 4 is connected or separated from the valve core 2, so that the flow control valve is closed or opened. The problems of unstable overall shape of the throttling part, flow separation, increased flow resistance, etc. caused by the driving device driving the valve core 2 to move in the prior art are avoided.

[0047] In this embodiment, the valve core 2 is spindle-shaped or water drop-shaped, and according to the medium flow direction ( Figure 1 The valve core 2 is a valve body 2, which is a valve body 2 having a plurality of parts connected in series. The valve core 2 has a plurality of parts connected in series, and the valve core 2 has ...

[0048] The valve seat 4 is close to one end (tail end) of the valve core 2, and the inner wall of the valve seat 4 is a smooth curved surface. When the valve seat 4 is connected to the valve core 2, the inner wall of the valve seat 4 is tangent to the outer surface of the valve core 2, thereby closing the control valve. In this embodiment, the axial section of the inner wall of the valve seat 4 is in an arc shape. According to design requirements, the axial section of the inner wall of the valve seat 4 can also be other smooth curved surfaces. The shape of the valve seat 4 is optimized to minimize the flow resistance and avoid damage to the overall flow field.

[0049] The valve core or valve seat of this embodiment does not adopt the valve cage or similar design in the prior art, which will not damage the linear shape of the axial flow channel in the valve body, thereby avoiding damage to the overall flow field.

[0050] Annular sealing rings 5 ​​are respectively provided on the outer peripheries of both ends of the valve seat 4 so as to be sealedly connected with the inner wall of the valve body 1 to prevent the medium from leaking from between the valve seat 4 and the inner wall of the valve body 1 .

[0051] The axial flow control valve of this embodiment further includes a plurality of support sheets 3, which are evenly distributed along the circumference of the valve core 2, one end of the support sheet 3 is connected to the outer periphery of the valve core 2, and the other end is connected to the inner wall of the valve body 1. The support sheet 3 firmly fixes the valve core 2 on the axis of the valve body 1. Apart from this, no additional components are installed on the valve core 2, which can avoid adverse effects on the rectification effect of the valve core 2.

[0052] The valve body 1 is in the shape of a circular tube, and its two ends can be connected to the medium pipeline through flanges respectively. In particular, a section of pipeline can be used as the valve body 1, and its inner diameter is the same as the inner diameter of the controlled medium pipeline. The driving device is arranged on the outside of the valve body 1. A rack is provided on the outer periphery of the valve seat 4, and the driving device includes an actuator 7 and a gear. The actuator 7 is used to drive the gear, and the gear is connected to the rack in a transmission manner, so that the valve seat 4 can be driven to move along the axial direction of the valve body 1 close to the inner wall of the valve body 1, so as to change the flow area between the valve seat 4 and the valve core 2 and control the flow in the valve body. When it is necessary to reduce the flow of the medium in the pipeline, the gear is driven to rotate by the actuator 7, and then the valve seat 4 is driven to approach the valve core 2 through the rack. At this time, the flow area between the valve seat 4 and the valve core 2 gradually decreases, and the flow in the pipeline also gradually decreases. When the valve seat 4 moves to a specific position, the inner wall of the valve seat 4 is tangent to the outer surface of the tail of the valve core 2 (such as Figure 2 In the middle dashed line, the valve is completely closed and the flow in the pipeline is zero. On the contrary, the actuator 7 drives the gear to rotate, and then drives the valve seat 4 to gradually move away from the valve core 2 through the rack. At this time, the flow area between the valve seat 4 and the valve core 2 gradually increases, and the flow in the pipeline also gradually increases until the required flow is reached. In order to make the valve seat 4 evenly stressed and move smoothly when moving, more than one set of racks and gears can be evenly distributed on the periphery of the valve seat 4, one of which is the driving gear 6a, connected to the actuator 7; the other gears are follower gears 6b, not connected to the actuator 7.

[0053] Due to the above structural characteristics, the axial flow flow control valve of this embodiment has more ideal flow characteristics compared with the existing axial flow flow control valve, such as Figure 2 As shown (data comes from prototype tests). Example 2

[0054] Figure 3 A schematic diagram showing the structure of an axial flow control valve according to a second exemplary embodiment of the present invention is shown. Figure 3 As shown, the difference between Example 2 and Example 1 is that: the outer periphery of the valve seat 4 is provided with threads, and the driving device includes an actuator 7 and a worm 8. The actuator 7 is used to drive the worm 8, and the worm 8 is connected to the thread transmission. The actuator 7 drives the worm 8, and then drives the valve seat 4 to move along the axial direction of the valve body 1 close to the inner wall of the valve body 1, so as to change the flow area between the valve seat 4 and the valve core 2 and control the flow in the pipeline. In order to make the valve seat 4 evenly stressed and move smoothly when moving, more than one group of worms can be evenly distributed on the outer periphery of the valve seat 4, one of which is an active worm connected to the actuator 7; the other worms are follower worms, which are not connected to the actuator 7. Example 3

[0055] Figure 4 A schematic diagram showing the structure of an axial flow control valve according to a third exemplary embodiment of the present invention is shown. Figure 4As shown, the difference between Example 3 and Example 1 is that the driving device includes an actuator 7 and a hydraulic cylinder 9 (or a cylinder), and the actuator 7 is used to drive the piston 9a of the hydraulic cylinder 9, and the piston rod 9b of the hydraulic cylinder 9 is connected to the outer periphery of the valve seat 4. The piston rod 9b is driven by the actuator 7, and then the valve seat 4 is driven to move along the axial direction of the valve body 1 close to the inner wall of the valve body 1, so as to change the flow area between the valve seat 4 and the valve core 2 and control the flow in the pipeline. When the flow of the medium in the pipeline needs to be reduced, the piston rod 9b is driven by the actuator 7, and then the valve seat 4 is pushed to approach the valve core 2. At this time, the flow area between the valve seat 4 and the valve core 2 gradually decreases, and the flow in the pipeline also gradually decreases. When the valve seat 4 moves to a specific position, the inner wall of the valve seat 4 is tangent to the outer surface of the tail of the valve core 2. At this time, the valve is completely closed and the flow in the pipeline is zero. On the contrary, the piston rod 9b is driven by the actuator 7 to push the valve seat 4 gradually away from the valve core 2. At this time, the flow area between the valve seat 4 and the valve core 2 gradually increases, and the flow in the pipeline also gradually increases until the required flow is reached. Example 4

[0056] Figure 5 A schematic diagram showing the structure of an axial flow control valve according to a fourth exemplary embodiment of the present invention is shown. Figure 5 As shown, the difference between Example 4 and Example 1 is that the head and tail of the valve core 2 are cones, the middle part is a cylinder, and the cone angle of the head is greater than the cone angle of the tail. Example 5

[0057] Figure 6 A schematic diagram showing the structure of an axial flow control valve according to a fifth exemplary embodiment of the present invention is shown. Figure 6 As shown, the difference between Example 5 and Example 1 is that the axial section of the head of the valve core 2 is arc-shaped or parabolic, the middle part is cylindrical, and the tail part has the same shape as the head part. This structure can be used when bidirectional flow control is required. Example 6

[0058] Figure 7 A schematic diagram showing the structure of an axial flow control valve according to a sixth exemplary embodiment of the present invention is shown. Figure 7 As shown, the difference between Example 6 and Example 1 is that the head and tail of the valve core 2 are cones, the middle part is a cylinder, and the cone angle of the head is equal to the cone angle of the tail. This structure can be used when bidirectional flow control is required. Example 7

[0059] Figure 8 A schematic diagram showing the structure of an axial flow control valve according to a seventh exemplary embodiment of the present invention is shown. Figure 8 As shown, the difference between Example 7 and Example 1 is:

[0060] Pressure holes 10 are provided on the side wall of the valve body 1, which are a high-pressure pressure hole and a low-pressure pressure hole. The high-pressure pressure hole is close to the end of the valve core 2 facing the fluid inlet. Preferably, the center of the high-pressure pressure hole is tangent to the head of the valve core 2, and the low-pressure pressure hole is close to the middle of the valve core.

[0061] The flow control valve also includes a differential pressure flowmeter 11, the high pressure inlet end and the low pressure inlet section of the differential pressure flowmeter 11 are respectively connected to the high pressure taking hole and the low pressure taking hole to measure the flow. Specifically, when the medium in the pipeline flows through the valve core 2, due to the rectifying effect of the valve core 2, the fluid evenly enters the annular fluid channel formed between the valve core 2 and the valve body 1. At this time, the fluid flow rate is accelerated and the pressure is reduced, forming a standard annular channel flow. The pressure difference between the lower pressure in the annular channel and the higher pressure at the head of the valve core 2 is used to obtain the instantaneous flow of the fluid in the pipeline after transmission, calculation and processing by the differential pressure flowmeter 11.

[0062] The driving device is connected to the differential pressure flowmeter 11, and drives the valve seat 4 to move along the axial direction of the valve body 1 according to the flow measured by the differential pressure flowmeter 11. Specifically, the driving device includes an actuator 7 and a gear. The flow measured by the differential pressure flowmeter 11 is transmitted to the actuator 7 as a feedback signal. The actuator 7 controls the movement of the valve seat 4 according to the flow, so that a closed-loop control between the pipeline flow and the valve seat movement can be formed, thereby accurately controlling the flow of the medium in the pipeline.

[0063] When the flow rate measured by the differential pressure flowmeter 11 is greater than the required flow rate, it is necessary to reduce the flow rate of the medium in the pipeline, drive the gear to rotate through the actuator 7, and then drive the valve seat 4 to approach the valve core 2 through the rack. At this time, the flow area between the valve seat 4 and the valve core 2 gradually decreases, and the flow rate in the pipeline also gradually decreases until the required flow rate is reached. Conversely, when the flow rate measured by the differential pressure flowmeter 11 is less than the preset flow rate, it is necessary to increase the flow rate of the medium in the pipeline, drive the gear to rotate through the actuator 7, and then drive the valve seat 4 to gradually move away from the valve core 2 through the rack. At this time, the flow area between the valve seat 4 and the valve core 2 gradually increases, and the flow rate in the pipeline also gradually increases until the required flow rate is reached.

[0064] The axial flow control valve of this embodiment integrates flow measurement and control, and can realize a closed-loop control valve with the medium flow as a feedback signal.

[0065] The embodiments of the present invention have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An axial flow flow control valve, characterized in that: include: A valve body, a valve core, a valve seat and a driving device; the valve body is tubular, the valve core is fixedly arranged in the valve body, and comprises a head, a middle and a tail connected in sequence, and an annular fluid channel is formed between the valve core and the valve body; the valve seat is tubular, and is sealed and connected to the inner wall of the valve body, and the valve body, the valve core and the valve seat are coaxially arranged; the driving device is arranged outside the valve body, and is used to drive the valve seat to move along the axial direction of the valve body so as to connect or separate with the valve core, so as to close or open the flow control valve; The valve seat is close to one end of the valve core, and the inner wall of the valve seat is a smooth curved surface; When the valve seat is connected to the valve core, the inner wall of the valve seat is tangent to the outer surface of the valve core; A high-pressure pressure-taking hole and a low-pressure pressure-taking hole are provided on the side wall of the valve body, the high-pressure pressure-taking hole is close to one end of the valve core facing the fluid inlet, and the low-pressure pressure-taking hole is close to the middle of the valve core; The flow control valve further comprises a differential pressure flow meter, wherein a high pressure inlet end and a low pressure inlet section of the differential pressure flow meter are respectively connected to the high pressure taking hole and the low pressure taking hole to measure the flow rate; The driving device is connected to the differential pressure flow meter, and drives the valve seat to move along the axial direction of the valve body according to the flow measured by the differential pressure flow meter, thereby realizing closed-loop control; The valve core is spindle-shaped or teardrop-shaped, and the axial section of the inner wall of the valve seat is arc-shaped; The axial section of the head is in the shape of an arc or a parabola, and the middle part is a cylinder; or, the axial section of the head is in the shape of an arc or a parabola, and the middle part is a cylinder, and the tail part has the same shape as the head part.

2. The axial flow control valve according to claim 1, characterized in that: Annular sealing rings are respectively arranged on the outer peripheries of both ends of the valve seat so as to be sealed and connected with the inner wall of the valve body.

3. The axial flow control valve according to claim 1, characterized in that: A rack is arranged on the outer periphery of the valve seat. The driving device comprises an actuator and a gear. The actuator is used to drive the gear. The gear is drivingly connected to the rack.

4. The axial flow control valve according to claim 1, characterized in that: The outer periphery of the valve seat is provided with threads, and the driving device comprises an actuator and a worm, wherein the actuator is used to drive the worm, and the worm is drivingly connected to the threads.

5. The axial flow control valve according to claim 1, characterized in that: The driving device comprises an actuator and an air cylinder or an oil hydraulic cylinder. The actuator is used to drive a piston of the air cylinder or the oil hydraulic cylinder. The piston rod of the air cylinder or the oil hydraulic cylinder is connected to the outer periphery of the valve seat.

6. The axial flow control valve according to claim 1, characterized in that: It also includes a plurality of support sheets, which are evenly distributed along the circumference of the valve core, one end of each support sheet is connected to the outer periphery of the valve core, and the other end is connected to the inner wall of the valve body.

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