CN111561580A

CN111561580A - Axial flow control valve

Info

Publication number: CN111561580A
Application number: CN201910125317.0A
Authority: CN
Inventors: 王乐; 袁杰; 秦晓娟
Original assignee: Fisher Jeon Gas Equipment Chengdu Co Ltd
Current assignee: Fisher Jeon Gas Equipment Chengdu Co Ltd
Priority date: 2019-02-14
Filing date: 2019-02-14
Publication date: 2020-08-21
Anticipated expiration: 2039-02-14
Also published as: CN111561580B

Abstract

The present invention provides an axial flow control valve, wherein the axial flow control valve comprises: a valve body; a gear box disposed inside the valve body; the first isolation component is arranged inside the valve body, and a first hole is formed in the first isolation component; the screw rod is arranged inside the valve body and penetrates through the first hole to be connected with the gear box; wherein the first isolation member isolates the gearbox from fluid within the valve body. The invention solves the problem of poor reliability of the axial flow control valve caused by the fact that transmission mechanisms such as a gear box and the like are easy to corrode in the related art, and achieves the effect of improving the reliability.

Description

Axial flow control valve

Technical Field

The invention relates to the field of valves, in particular to an axial-flow control valve.

Background

The axial flow control valve is generally composed of an axial flow valve body and a piston type intercepting element installed at the position of a central axis in the axial flow control valve body, and the size of the area of an intercepting surface is adjusted by controlling the linear motion of a piston or a valve plug along the axis, so that the aim of controlling flow and pressure is fulfilled.

The axial flow type control valve has the advantages of large flow capacity, low pressure loss, stable fluid state of fluid, easy installation of silencing accessories and the like. However, because the piston-type shutoff element is mounted inside the valve body and moves along the axial direction of the valve body, to drive the valve plug to move, the driving force provided by an actuator mounted outside the valve body needs to be changed in direction or manner by a set of transmission mechanism and transmitted to the valve plug.

A transmission mechanism is typically disposed within the valve body to drive movement of the valve plug. When the transmission mechanism is contacted with working gas with harmful gas and impurities, the transmission mechanism is corroded and abraded, and the impurities are accumulated; however, when the transmission is isolated from the working gas, the unbalanced forces from the pressure differential can again impede the movement of the valve plug.

In the related art, there are different types of transmission mechanisms, and for example, the following transmission mechanisms may be employed in a valve body: a double-bevel-rack staggered transmission mechanism, a gear-rack transmission mechanism, a built-in gear box transmission mechanism and the like.

In the related technology, the valve body of the transmission mechanism with the built-in gear box adopts a top-mounted structure to directly build the gear box in the valve body and a working medium, the flow area of the valve body is reduced, the flow capacity is smaller, and the gear box can be continuously corroded by harmful gas and is easy to damage.

Disclosure of Invention

In order to solve the above problems, the present invention provides an axial flow type control valve.

An axial flow control valve comprising: a valve body; a gear box disposed inside the valve body; the first isolation component is arranged in the valve body, and a first hole is formed in the first isolation component; the screw rod is arranged inside the valve body and penetrates through the first hole to be connected with the gear box; wherein the first isolation member isolates the gearbox from fluid within the valve body.

Preferably, the axial flow control valve further comprises: the support piece is arranged on the outer surface of the screw rod sleeve, the screw rod sleeve is arranged on the outer surface of the screw rod, the support piece is connected with the first isolation part, and the axis of the support piece is the same as that of the screw rod.

Preferably, the supporting member includes an end portion connected to the first insulating member and an extension portion having a hollow cylindrical shape and a cross-sectional diameter of the end portion larger than that of the extension portion.

Preferably, the extension part is provided with a pressure hole, and the pressure hole penetrates through the side wall of the extension part.

Preferably, a boss is provided on an outer surface of the extension, the boss being closer to a fluid inlet of the axial flow control valve than the pressure hole.

Preferably, the support and the first isolation member are integrally provided.

Preferably, the axial flow control valve further comprises: a first seal ring disposed between the valve body and the first isolation member; and/or a second sealing ring is arranged between the first isolation component and the support.

Preferably, the screw rod sleeve comprises a closed end and an open end, a second hole and a hole plug are arranged on the closed end, and the second hole extends along the axial direction of the screw rod sleeve; wherein the bore plug is a close fit with the second bore in an operational state of the axial flow control valve.

Preferably, the axial flow control valve further comprises: a gasket disposed outside the valve body and detachably connected to one end of a fluid inlet of the axial flow control valve; wherein the inner diameter of the gasket is matched with the caliber of a fluid inlet of the axial flow type control valve.

Preferably, the first isolation member includes a cylindrical interior cavity, wherein one end of the first isolation member is sealed and the first aperture is disposed at the sealed end of the first isolation member, and the gear box is disposed within the cylindrical interior cavity of the first isolation member.

Preferably, a groove is arranged on the outer surface of the first isolation part; a guide sleeve is arranged on the outer surface of the driving shaft of the gear box and can be clamped into the groove and matched with the groove; and the input shaft of the gear box is connected with the driving shaft through a mounting hole arranged on the groove.

Preferably, the axial flow control valve further comprises: and the second isolation component is arranged outside the valve body and on the outer surface of a driving shaft of the gear box, and the axis of the second isolation component is the same as that of the driving shaft.

Preferably, the axial flow control valve further comprises: a first thrust bearing, and/or a second thrust bearing; the first thrust bearing is arranged on the lead screw and is in contact with the first isolation component; the second thrust bearing is disposed on the drive shaft and received in the guide sleeve, the second thrust bearing being in contact with the second isolation member.

Preferably, the axial flow control valve further comprises: the flow adjusting sleeve is arranged in the valve body and is matched with a bearing frame in the valve body; the flow regulating sleeve regulates the flow in the valve body by regulating the size of an opening of a window on the bearing frame.

Preferably, at least one supporting leg is fixedly arranged on the flow regulating sleeve, and each supporting leg comprises a first end and a second end; the first end is connected with the inner surface of the flow regulating sleeve, and the second end is connected with a hollow round table clamped on the screw rod sleeve; the at least one supporting leg can drive the flow adjusting sleeve to move along the axial direction of the screw rod when the screw rod sleeve moves.

Preferably, the number of the supporting legs is more than two; each supporting leg is provided with a concave part; each of the recesses extends from a surface of the first end toward a fluid inlet side of the axial flow control valve in an axial direction of the lead screw sleeve.

Preferably, the support legs are evenly circumferentially distributed on the inner surface of the flow regulating sleeve.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:

FIG. 1 is a structural schematic diagram in axial cross-section of one embodiment of an axial flow control valve according to the present invention;

FIG. 2 is an exploded view, partially broken away, of the internal structure of one embodiment of an axial flow control valve according to the present invention;

FIG. 3 is a schematic view, partially in section, of one embodiment of a first isolation member of an axial flow control valve according to the present invention;

FIG. 4 is a schematic illustration in partial cross-section of one embodiment of a support for an axial flow control valve according to the present invention;

fig. 5 is a partially broken away schematic structural view of one embodiment of a flow adjustment sleeve of an axial flow control valve according to the present invention.

Detailed Description

The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The present invention provides an axial flow control valve, and fig. 1 is a structural schematic view of an axial cross section of one embodiment of an axial flow control valve according to the present invention. An axial flow control valve, as shown in fig. 1, comprising: a valve body 100; a gear case 110 disposed inside the valve body 100; a first partition member 120 provided inside the valve body, the first partition member 120 having a first hole 121; a screw 130 disposed inside the valve body 100, wherein the screw 130 passes through the first hole 121 and is connected to the gear case 110; wherein the first isolation member 120 isolates the gear case 110 from the fluid inside the valve body (it can also be said that the space where the screw 130 is located communicates with the fluid passage 131 inside the valve body 100, and the first isolation member 120 isolates the gear case 110 from the fluid passage 131).

In this embodiment, the first isolation member provides axial positioning for the entire valve cartridge assembly, provides a seat for mounting the gearbox (and associated drive shaft or other transmission), provides a static sealing surface for contact with other components, and isolates the gearbox from the fluid (or fluid passage) within the valve body, thereby isolating the gearbox from the working medium and preventing corrosion of the gearbox by harmful media and impurities. In addition, under the technical scheme, the transmission mechanisms such as the gear box and the like are not easy to corrode or damage, the reliability of the axial flow type control valve is improved, and the gear box or other parts in the valve do not need to be frequently replaced, so that a top-mounted opening does not need to be arranged on the valve body to replace or put in the parts such as the gear box and the like. In the technical scheme, when the gear box is arranged in the valve body, the problem that the flow area and the flow capacity in the valve are reduced due to the fact that the top-mounted opening is arranged is solved, so that the flow area in the valve is saved, and the influence on the flow capacity is small.

Through the technical scheme provided by the invention, the problem that the axial flow control valve is poor in reliability due to the fact that transmission mechanisms such as a gear box and the like are easy to corrode in the related technology is solved, and the effect of improving the reliability of the axial flow control valve is achieved.

As a preferred embodiment, the axial flow type control valve, as shown in fig. 1, further includes: and a supporter 140 disposed on an outer surface of the lead screw sleeve 132 disposed on an outer surface of the lead screw 130, the supporter 140 being connected to the first spacer 120, and an axis of the supporter 140 being the same as an axis of the lead screw 130. Under this embodiment, first isolation parts is installed in the valve body, is connected with support piece for first isolation parts is fixed better, and valve body in-process stability is better, and the leakproofness is also better.

As another preferred embodiment, the screw rod in the axial flow type control valve can be a sliding screw rod, the sliding screw rod has a self-locking function, and the screw rod can be self-locked when the machine fails, so that the safety of the production process is improved.

As another preferred embodiment, as shown in fig. 2 and 4, the supporting member 240 may include an end portion 241 and an extension portion 242, the end portion 241 may be connected to the first isolation member 220, the extension portion 242 may be a hollow cylinder, and a cross-sectional diameter of the end portion 241 is larger than a cross-sectional diameter of the extension portion 242. In this embodiment, the support member can support the screw rod more effectively in the axial direction of the axial flow type control valve, preventing the screw rod from being inclined.

As another preferred embodiment, the extension 242 may be provided with a pressure hole 243, and the pressure hole 243 penetrates through a sidewall of the extension 242. In this embodiment, a pressure hole is formed on a side wall of the extension 242 of the support 240, and pressure inside and outside the extension of the support is adjusted, so that when the screw rod and the screw rod sleeve move in the extension, pressure between the screw rod and the screw rod sleeve is balanced; moreover, by the embodiment, the pressure bearing areas of the inner part of the flow sleeve and the fluid inlet end are equal, balance is kept, and unbalanced force does not exist; and the pressure (fluid pressure) inside and outside the cylinder of the extension part is balanced, so that the axial flow type control valve can move more smoothly in the working process of the screw rod and the like.

As another preferred embodiment, the extension 242 may be provided with a boss 244 on an outer surface thereof, the boss 244 being closer to a fluid inlet (such as the fluid inlet 101 shown in fig. 1) of the axial flow control valve than the pressure hole 243. Under this embodiment, the fluid that flows into support piece from fluid entry direction flows through the boss earlier, and then flows into the pressure port, and the boss has the effect of blockking to impurity or deposit in the fluid, has prevented the impurity in the fluid from flowing into the pressure port for axial-flow control valve is at the course of the work, and the motion of lead screw etc. is also more smooth and easy.

As another preferred embodiment, the support member and the first partition member may be integrally provided. Under this embodiment, the structure of the interior subassembly of valve is simpler, and processing, the installation of product are more convenient, and the leakproofness is better.

As another preferred embodiment, the axial flow control valve, as shown in fig. 1, may further include: a first packing 115 provided between the valve body 100 and the first isolation member 120; and/or a second seal ring 125 disposed between the first isolation member 120 and the support 140. Through the embodiment, in the axial flow type control valve, the isolation and sealing effects between the fluid (or the fluid channel) in the valve body and the space where the transmission mechanism such as the gear box is located are better, the corrosion of the gear box or the transmission mechanism is prevented, and the transmission mechanism such as the gear box can be better protected.

As another preferred embodiment, as shown in fig. 5, the lead screw sleeve 232 may include a closed end 234 and an open end 236, the closed end 234 being provided with a second hole 237 and a hole plug 238, the second hole (alternatively referred to as an oil hole) extending in the axial direction of the lead screw sleeve 232; wherein the bore plug is a close fit with the second bore in an operational state of the axial flow control valve. Wherein in this embodiment the closed end is closer to one end of the fluid inlet of the valve body than said open end. In this embodiment, the bore plug is a close fit with the second bore in the operating state of the axial flow control valve; when it is desired to inject a lubricant (e.g., lubricating oil, etc.) into the lead screw sleeve, the plug can be removed from the second bore (the plug is separated from the second bore when it is desired to inject a lubricant).

As another preferred embodiment, the axial flow control valve, as shown in fig. 1, further includes: a gasket 102 disposed outside the valve body 100 and detachably connected to one end of a fluid inlet 101 of the axial flow control valve of the valve body 100; wherein the inner diameter of the gasket 102 is adapted to the bore of the fluid inlet of the axial flow control valve. Through the embodiment, the valve body of the axial flow control valve is arranged on a pipeline through the gasket, so that the online maintenance in the production process is facilitated, the online used axial flow control valve can be detached on line through the gasket, the lubricant and the like are injected into the valve body, and the sealing element in the valve body is more convenient to replace; in this embodiment, the use, maintenance, and the like of the axial flow control valve are facilitated.

As another preferred embodiment, as shown in fig. 2, the first isolation member 220 includes a cylindrical inner cavity, wherein one end 221 of the first isolation member 220 is sealed, and the first hole 222 is provided on the sealed end 221 of the first isolation member, and the gear case 210 may be provided in the cylindrical inner cavity 223 of the first isolation member 220. In this embodiment, the gear box can be accommodated in the cavity (or called accommodating cavity) of the first isolation component and connected with the screw rod through the first hole at the sealed end of the first isolation component, and this structure has a supporting effect on the gear box, provides a base for the installation of the gear box, and simultaneously enables transmission mechanisms such as the gear box to be better isolated outside the fluid passage, so as to avoid the gear box from contacting with fluid (or working medium), so that the sealing effect is better, and the corrosion of harmful medium and impurities to the gear box is avoided.

FIG. 3 is a partially cut-away schematic view of one embodiment of a first isolation member of an axial flow control valve according to the present invention. As another preferred embodiment, as shown in fig. 3, a groove 324 is provided on the outer surface of the first partition member; a guide sleeve is arranged on the outer surface of the driving shaft of the gear box (as shown in fig. 1, a guide sleeve 161 is arranged on the outer surface of the driving shaft 160 of the gear box 110), and the guide sleeve can be clamped into the groove 324 and matched with the groove 324; the input shaft of the gearbox (shown in fig. 1 as the input shaft 170 connected to the gearbox) is connected to the drive shaft through mounting holes provided in the recesses (shown in fig. 2 as mounting holes 226 provided in the recesses 224 of the first spacer member 220). Under this embodiment, the uide bushing can block in the recess closely, and the drive shaft passes through the mounting hole on the recess and is connected with the input shaft, and the input shaft is again connected to the gear box, in the installation, can fix a position the uide bushing. Through this embodiment, the uide bushing card goes into in the recess, and then fixes a position the drive shaft, and drive shaft and uide bushing are inseparabler with first spacer assembly's connection. Preferably, the groove is a U-shaped open slot.

As another preferred embodiment, the axial flow control valve, as shown in fig. 1, may further include: and a second isolating member 150 disposed outside the valve body 100 and on an outer surface of the driving shaft 160 of the gear box 110 (or the driving shaft 160 of the axial flow control valve), and an axis of the second isolating member 150 is the same as an axis of the driving shaft 160. In this embodiment, the axial flow control valve adopts a double isolation sealing mode, and when the first isolation sealing mode fails, the axial flow control valve can still work normally due to the existence of the second isolation sealing mode. Through this embodiment, improved the reliability of valve, strengthened the protection to dangerous medium, avoided the medium to leak the harm that causes the environment.

As another preferred embodiment, the axial flow control valve, as shown in fig. 1, may further include: a first thrust bearing, and/or a second thrust bearing; wherein a first thrust bearing 136 (shown in fig. 1) may be disposed on the lead screw and in contact with the first isolation member 120; a second thrust bearing 166 may be disposed on the drive shaft 160 and received within the guide sleeve 161, the second thrust bearing 166 contacting the second isolation member 150. In this embodiment, the thrust bearing (first thrust bearing, and/or second thrust bearing) is disposed on the lead screw and/or the drive shaft, so that during operation of the axial flow control valve, an unbalanced force of the valve stem (referred to as the drive shaft or the lead screw) is transmitted to the valve body, and the valve body receives an axial force generated by installation, so that the unbalanced force during operation does not affect the input torque.

As another preferred embodiment, the axial flow control valve, as shown in fig. 2, may further include: a flow regulating sleeve 280, the flow regulating sleeve 280 being disposed within the valve body, the flow regulating sleeve 280 being disposed in cooperation with a shelf 290 within the valve body; the flow regulating sleeve 280 regulates the flow within the valve body by adjusting the size of the opening of the window 291 in the retainer 290. In this embodiment, due to the movement of the flow rate adjustment sleeve, a position change is generated between the flow rate adjustment sleeve and the window of the carrier, so that the window on the carrier is gradually opened or closed (i.e., the window into which the fluid of the axial flow type control valve flows), thereby increasing or decreasing the flow rate of the fluid inside the valve body (or the flow rate in the fluid channel), and achieving the effect of adjusting the flow rate of the fluid in the axial flow type control valve.

As another preferred embodiment, as shown in fig. 2 and 5, at least one support leg 281 may be fixedly disposed on the flow regulating sleeve 280, each support leg 281 including a first end 284 and a second end 286; the first end 284 can be connected with the inner surface 282 of the flow rate adjusting sleeve, and the second end 286 is connected with a hollow circular truncated cone 288 (it should be noted that, in the drawing, a structural schematic diagram of the hollow circular truncated cone partially cut away is shown) which is clamped on a screw rod sleeve 232 (the screw rod sleeve 232 arranged on the outer surface of the screw rod 230, the axial direction is the same as the axial direction of the screw rod); the at least one support leg 281 is capable of driving the flow rate adjustment sleeve to move along the axial direction of the screw 230 when the screw sleeve 232 moves. In the embodiment, the rotary motion is converted into linear motion through the screw rod and the screw rod sleeve, the screw rod sleeve moves to drive the hollow circular truncated cone clamped on the screw rod sleeve to move, so that the supporting leg is driven to move linearly, the flow regulating sleeve moves linearly in the valve body along with the movement of the supporting leg, the size of a window on the bearing frame is regulated, and the flow of fluid in the valve body is regulated; in addition, in the embodiment, the flow regulation mode is simpler to realize, too much fluid channel space is not occupied, and the influence on the circulation capacity of the valve body is small.

As another preferred embodiment, as shown in fig. 2 and 5, the number of the support legs 281 may be two or more, each of the support legs is provided with a recess 283, and each of the recesses 283 extends from a surface of the first end 284 (i.e., from a surface of each of the support legs 281 near one end of the flow rate adjustment sleeve) toward a fluid inlet side of the axial flow control valve (i.e., a direction in which the fluid inlet 101 is located as shown in fig. 1) along an axial direction of the screw sleeve 232 (i.e., an axial direction of the flow rate adjustment sleeve). Under this embodiment, the valve interior subassembly etc. can assemble and hoist on flow control sleeve, at the hoist and mount in-process, can with hoist and mount area etc. imbed each concave part in, the hoist and mount process is safer, hoist and mount area be difficult for the slippage, adopt the supporting leg more than two for the hoist and mount process is more balanced, and the installation is safer.

In this embodiment, each support leg is provided with a concave portion, and the concave portion may be disposed at the first end or the second end, and both directions of the concave portion and the second end extend along the axial direction of the screw rod sleeve to the fluid inlet side of the axial flow control valve; and the concave part on the supporting leg can be arranged by extending the protruding platform at the edge, and can also be realized by a groove dug (arranged) on the surface of the supporting leg. Preferably, every concave part all sets up in first end department for the setting of concave part is simpler, does not occupy the telescopic space of lead screw, saves the space in the flow control sleeve more, and at hoist and mount in-process, the placing of hoist and mount area is also more convenient.

As another preferred embodiment, the support legs may be evenly circumferentially distributed on the inner surface of the flow regulating sleeve. Under this embodiment, the supporting leg distributes on flow control sleeve's internal surface along circumference uniformly (or, more than two supporting legs distribute for lead screw sleeve axle symmetry on flow control sleeve's internal surface), then concave part on it is even along flow control sleeve internal surface circumference for in hoist and mount process, the atress is more even in flow control sleeve's each direction, the equilibrium of hoist and mount is better, the hoist and mount process is difficult for damaging the interior part of valve, the security is higher.

It should be noted that the above only shows some preferred embodiments of the axial flow control valve, and those skilled in the art can combine the above embodiments according to the actual application. For example, as a preferred embodiment, the axial flow control valve may include the following embodiments: a first isolation member and a flow regulating sleeve; wherein the gearbox may be disposed within the cavity of the first isolation member; the flow regulating sleeve can regulate the flow in the valve body by regulating the opening size of the window on the bearing frame. The technical effects of the preferred embodiment are the same as those described above, and are not described herein again.

Through the above embodiments, an axial flow control valve is provided. Through this technical scheme, following technological effect has been reached: the problem that the axial flow control valve is poor in reliability due to the fact that a gear box is prone to being corroded in the related technology is solved, and the effect of improving the reliability of the axial flow control valve is achieved; the gear box is arranged in the valve body, and the rotary motion is converted into the linear motion required by the valve plug through a screw rod, a screw rod sleeve and other mechanisms; the gear box and the screw rod mechanism can be integrally installed into the valve body from the valve port, a top installation opening is not required to be arranged on the valve body, and the influence on the circulation capacity of the valve body is small; the working medium is isolated from the transmission gear box by utilizing the first isolation component (and the sealing ring and the like), so that the corrosion of harmful media and impurities to the gear box is avoided; through the arrangement of the first thrust bearing and/or the second thrust bearing, the unbalanced force of the valve rod (a driving shaft or a screw rod) is transmitted to the valve body, and the valve body only bears the axial force generated by installation, so that the unbalanced force in the working process cannot influence the input torque, and the performance of the valve body is more stable and reliable in the working process; by adopting double isolation and sealing, under the severe working condition, after the first isolation and sealing fails, the second isolation and sealing can still ensure the normal work of the valve, thereby improving the reliability of the product and the protection of dangerous media and avoiding the damage of the leakage of the media to the environment; the input end of the axial flow type valve body is suitable for multi-rotation electric, hydraulic, electro-hydraulic and pneumatic actuators, a mechanical stroke indicator can be matched, and the overall height of the valve is smaller.

It should be noted that these technical effects are not possessed by all the embodiments described above, and some technical effects are obtained only by some preferred embodiments.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. An axial flow control valve, comprising:

a valve body;

a gear box disposed inside the valve body;

the first isolation component is arranged in the valve body, and a first hole is formed in the first isolation component;

the screw rod is arranged inside the valve body and penetrates through the first hole to be connected with the gear box;

wherein the first isolation member isolates the gearbox from fluid within the valve body.

2. The axial flow control valve of claim 1, further comprising:

the support piece is arranged on the outer surface of the screw rod sleeve, the screw rod sleeve is arranged on the outer surface of the screw rod, the support piece is connected with the first isolation part, and the axis of the support piece is the same as that of the screw rod.

3. The axial flow control valve of claim 2,

the support piece comprises an end part and an extension part, the end part is connected with the first isolation part, the extension part is a hollow cylinder, and the diameter of the cross section of the end part is larger than that of the cross section of the extension part.

4. The axial flow control valve of claim 3, wherein the extension has a pressure hole disposed therein, the pressure hole extending through a sidewall of the extension.

5. The axial flow control valve of claim 4, wherein a boss is provided on an outer surface of the extension, the boss being closer to a fluid inlet of the axial flow control valve than the pressure hole.

6. The axial flow control valve of claim 2,

the support member and the first isolation member are integrally provided.

7. The axial flow control valve of claim 2, further comprising:

a first seal ring disposed between the valve body and the first isolation member; and/or the presence of a gas in the gas,

and a second seal ring disposed between the first isolation member and the support member.

8. The axial flow control valve of claim 2,

the screw rod sleeve comprises a closed end and an open end, a second hole and a hole plug are arranged on the closed end, and the second hole extends along the axial direction of the screw rod sleeve;

wherein the bore plug is a close fit with the second bore in an operational state of the axial flow control valve.

9. The axial flow control valve of any of claims 1-8, further comprising:

a gasket disposed outside the valve body and detachably connected to one end of a fluid inlet of the axial flow control valve;

wherein the inner diameter of the gasket is matched with the caliber of a fluid inlet of the axial flow type control valve.

10. An axial flow control valve as defined in any one of claims 1 to 8, wherein said first isolation member includes a cylindrical interior cavity, wherein one end of said first isolation member is sealed and said first bore is disposed at the sealed end of said first isolation member, said gear box being disposed within the cylindrical interior cavity of said first isolation member.

11. The axial flow control valve of claim 10,

a groove is formed in the outer surface of the first isolation component;

a guide sleeve is arranged on the outer surface of the driving shaft of the gear box and can be clamped into the groove and matched with the groove;

and the input shaft of the gear box is connected with the driving shaft through a mounting hole arranged on the groove.

12. The axial flow control valve of claim 11, further comprising:

and the second isolation component is arranged outside the valve body and on the outer surface of a driving shaft of the gear box, and the axis of the second isolation component is the same as that of the driving shaft.

13. The axial flow control valve of claim 12, further comprising: a first thrust bearing; and/or, a second thrust bearing;

the first thrust bearing is arranged on the lead screw and is in contact with the first isolation component; the second thrust bearing is disposed on the drive shaft and received in the guide sleeve, the second thrust bearing being in contact with the second isolation member.

14. The axial flow control valve of any of claims 2-8, further comprising:

the flow adjusting sleeve is arranged in the valve body and is matched with a bearing frame in the valve body;

the flow regulating sleeve regulates the flow in the valve body by regulating the size of an opening of a window on the bearing frame.

15. The axial flow control valve of claim 14,

at least one supporting leg is fixedly arranged on the flow regulating sleeve, and each supporting leg comprises a first end and a second end;

the first end is connected with the inner surface of the flow regulating sleeve, and the second end is connected with a hollow round table clamped on the screw rod sleeve;

the at least one supporting leg can drive the flow adjusting sleeve to move along the axial direction of the screw rod when the screw rod sleeve moves.

16. The axial flow control valve of claim 15,

the number of the supporting legs is more than two;

each supporting leg is provided with a concave part;

each of the recesses extends from a surface of the first end toward a fluid inlet side of the axial flow control valve in an axial direction of the lead screw sleeve.

17. The axial flow control valve of claim 16, wherein the support legs are evenly circumferentially distributed on an inner surface of the flow adjustment sleeve.