CN112984206B

CN112984206B - Pipeline throttle valve

Info

Publication number: CN112984206B
Application number: CN202110515599.2A
Authority: CN
Inventors: 成雷; 张伟伟; 王家佳; 张翠娟; 夏欣; 蒋芳芳; 刘同玲; 朱彩红; 张晓静; 肖菲
Original assignee: Shandong Baiyuan Technology Co Ltd
Current assignee: Shandong Baiyuan Technology Co Ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-09-07
Anticipated expiration: 2041-05-12
Also published as: CN112984206A

Abstract

The invention belongs to the technical field of petroleum pipeline transportation, and discloses a pipeline throttle valve. The throttling pipe is fixedly embedded in the middle of the top end of the outside of the valve body, the flow isolating plate is uniformly sleeved and mounted at the edge of the bottom end of the outside of the valve rod, the fixed gear disc is sleeved and mounted at the top end of the outside of the valve rod, the movable clamping arms are rotatably mounted at two sides of the outside of the fixed gear disc, and the rotary gear ring is welded and mounted at the top end of the outside of the movable clamping arms. According to the invention, the adjusting screw rod is screwed outwards to screw out the telescopic toothed plate upwards, and the two movable clamping arms can be tightened by matching the meshing between the two sides of the outer wall of the telescopic toothed plate and the rotating toothed rings at the top ends of the two movable clamping arms. The friction between the brake rubber sheet and the fixed gear disc at the top end outside the valve rod can increase the resistance of the valve rod during rotation, and can reduce the rotating speed of the flow isolating plate, so that the throttling function of oil liquid inside the valve body is realized, and the throttling range and the throttling precision are improved.

Description

Pipeline throttle valve

Technical Field

The invention relates to the technical field of petroleum pipeline transportation, in particular to a pipeline throttle valve.

Background

An oil and gas field refers to the sum of an oil reservoir, a gas reservoir, and an oil and gas reservoir within the same area controlled by a single local structural unit, the oil and gas field producing oil and gas. In order to collect and transport these resources to the outside, in many cases, a throttle valve needs to be arranged in these fluid pipelines to control the flow of the pipeline by changing the throttle section or the throttle length and controlling the flow rate of the fluid, so as to realize throttling and pressure reduction of the fluid in the pipeline.

However, when the existing pipeline throttle valve is used, the problems that the range of oil liquid throttling by the valve body is small, the adjusting precision is poor, and the scientificity of the device use is poor exist.

Disclosure of Invention

The invention aims to provide a pipeline throttle valve which is wide in adjusting range, high in adjusting precision and high in use scientificity, so as to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a pipeline throttle valve, includes valve body, feed liquor pipe, drain pipe and throttle pipe, the fixed joint of feed liquor pipe is installed outside one side of valve body. The fixed joint of drain pipe is installed the outside opposite side of valve body, throttle pipe fixed embedding is installed the outside top middle part of valve body, the valve rod is installed in the inside embedding that runs through of valve body. The inner wall of the throttle pipe is provided with a throttle mechanism in a position close to the valve rod in an embedded mode, the bottom end of the outer portion of the valve rod is provided with a connecting mechanism, and the liquid inlet pipe and the liquid outlet pipe are internally provided with a feedback mechanism in an embedded mode. The throttle pipe is used for throttling liquid flowing through the liquid inlet pipe and inside the valve body, and the connecting mechanism is used for fixedly connecting the throttle pipe and the bottom end of the valve rod. The feedback mechanism is used for adjusting and feeding back the flow of the liquid discharged by the valve body;

the throttling mechanism comprises an adjusting screw, a fixed gear disc, a movable clamping arm, a rotary gear ring, a telescopic toothed plate, a brake rubber sheet and a flow isolating plate. The flow isolating plate is uniformly sleeved and installed at the edge of the bottom end of the outer portion of the valve rod, and the fixed gear disc is sleeved and installed at the top end of the outer portion of the valve rod. The movable clamping arms are rotatably arranged on two sides of the outer portion of the fixed gear disc, and the rotary gear ring is welded to the tops of the movable clamping arms. The adjusting screw rod penetrates through the positions, corresponding to the two rotary gear rings, of the outer wall of the throttle pipe. The telescopic tooth plate is clamped and installed at the position, corresponding to the outer wall of the rotary gear ring, of the bottom end of the adjusting screw rod, and the brake rubber sheet is attached to the inner wall surface of the movable clamping arm.

Furthermore, the outer wall of the bottom of the adjusting screw rod is fixedly connected with the inner wall of the throttle pipe through threads. The two sides of the outer wall of the telescopic toothed plate are connected with the two rotary toothed rings through toothed meshing, and the outer diameter of the flow isolating plate is equal to half of the inner diameter of the valve body.

Furthermore, the connecting mechanism comprises a connecting chassis, a supporting spring, a fixed vertical groove, a limiting bump and a dismounting transverse groove. The connection chassis is fixedly clamped and installed at the position, close to the outer top end of the flow partition plate, of the valve rod, and the support spring is sleeved and installed at the position, corresponding to the outer portion of the valve rod, of the top end of the connection chassis. The fixed vertical groove is formed in one side of the bottom end of the outer wall of the valve rod, the limiting lug is fixedly mounted on one side of the inner wall of the connecting chassis, and the dismounting transverse groove is formed in one side of the top end of the inner wall of the fixed vertical groove.

Furthermore, the outside of the connecting chassis is fixedly connected with the valve body through a sealing chuck, and the inside of the connecting chassis is fixedly connected with the valve rod through a bearing clamping ring.

Furthermore, the feedback mechanism comprises a steady flow inner container, a one-way valve plug, a movable valve plate, a compression spring, a leakage flow inner container and a flow monitoring meter. The stationary flow inner bag embedding is installed inside one side of feed liquor pipe, one-way valve plug activity cup joints and installs the outside one side of stationary flow inner bag. The movable valve plate is movably sleeved and installed inside the steady flow inner container, and the compression spring is sleeved and installed on one side of the outside of the movable valve plate and between the bottoms of the one-way valve plugs. The drainage inner container is sleeved inside the liquid outlet pipe, and the flow monitoring meters are embedded in two sides of the inner wall of the drainage inner container.

Furthermore, the shape of one-way valve plug is arc end cap, the stationary flow inner bag is inside to set up to the spindle bodily form, just the stationary flow inner bag outer wall with pass through bolt fixed connection between the feed liquor pipe.

Furthermore, a lubricating nozzle is embedded and installed at the position, close to the valve rod, of the top end of the outer portion of the throttling pipe, fixing flanges are welded and installed on two sides of the outer portion of the valve body, and waterproof sealing rubber rings are installed inside the fixing flanges in a sleeved mode.

Compared with the prior art, the invention has the beneficial effects that:

the invention is provided with a throttling mechanism, oil which flows into the valve body through a liquid inlet pipe is separated by a plurality of flow isolating plates at the bottom end of the valve rod, and the flow isolating plates are pushed to rotate under the action of flow impact of the oil. Outwards twist and move adjusting screw and upwards screw out telescopic tooth plate, cooperation telescopic tooth plate outer wall both sides and the meshing between the rotatory ring gear in two movable arm lock tops can tighten up two movable arm lock. The friction between the brake rubber sheet and the fixed gear disc at the top end outside the valve rod can increase the resistance of the valve rod during rotation, and can reduce the rotation speed of the flow isolating plate. Thereby realized to the inside throttle function to fluid of valve body, the change to fixed gear friction resistance of movable clamp arm simultaneously for the valve body increases substantially to the scope and the precision of fluid throttle, and the device is used conveniently, and manufacturing cost is lower.

The connecting mechanism is arranged, the flow isolating plate is pressed downwards, the limiting lug at the inner wall of the connecting chassis slides into the bottom of the detaching transverse groove, and the connecting chassis is supported and fixed at the top end by matching with a supporting spring outside the valve rod. The top end of the flow isolating plate is firmly installed under the action of the connecting base plate. The flow partition plate can be lifted upwards in the same way, the connecting chassis 701 and the flow partition plate are detached and taken out by matching the limiting convex block to slide into the detaching and taking transverse groove top, and therefore the convenience and the convenience of the flow partition plate in dismounting and repairing are guaranteed.

The liquid inlet pipe is provided with a feedback mechanism, and the one-way valve plug inside the steady flow liner can preliminarily buffer and stabilize the oil entering the liquid inlet pipe. And the support of the movable valve plate is matched with a compression spring, so that secondary buffering and steady flow can be performed on oil, the inner diameter of the steady flow inner container 801 is enlarged by rightward sliding of the movable valve plate 803, and the problem that later-stage throttling is difficult due to large oil flow is solved. And the flow monitoring meter in the internal drainage liner of the liquid outlet pipe can be matched to detect and feed back the oil flow discharged by the valve body, so that the throttling force in the valve body can be correspondingly changed, and the scientificity of the valve body on oil throttling is improved.

Drawings

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic cross-sectional view of the interior of the valve body of FIG. 1;

FIG. 3 is a schematic perspective view of the interior of the throttle tube of FIG. 2;

figure 4 is a schematic top view of the telescoping tooth plate mounting of figure 3;

FIG. 5 is a perspective view of the connection chassis of FIG. 2;

FIG. 6 is a schematic view of the structure of FIG. 5 showing the transverse slot;

fig. 7 is a schematic sectional view showing the installation of the drain liner of fig. 1.

Reference numerals: 1. a valve body; 2. a liquid inlet pipe; 3. a liquid outlet pipe; 4. a throttle pipe; 5. a valve stem; 6. a throttle mechanism; 601. adjusting the screw rod; 602. fixing a gear disc; 603. a movable clamping arm; 604. rotating the toothed ring; 605. a retractable toothed plate; 606. a brake rubber sheet; 607. a flow isolating plate; 7. a connecting mechanism; 701. connecting a chassis; 702. a support spring; 703. fixing the vertical groove; 704. a limiting bump; 705. disassembling the transverse groove; 8. a feedback mechanism; 801. a flow stabilizing liner; 802. a one-way valve plug; 803. a movable valve plate; 804. a compression spring; 805. a drainage liner; 806. a flow monitoring meter; 9. a lubricating oil nozzle; 10. and (5) fixing the flange.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): referring to fig. 1-4, a pipeline throttle valve includes a valve body 1, a liquid inlet pipe 2, a liquid outlet pipe 3, and a throttle pipe 4. The fixed joint of feed liquor pipe 2 is installed in 1 outside one side of valve body, and the fixed joint of drain pipe 3 is installed in 1 outside opposite side of valve body, and the fixed embedding of throttle pipe 4 is installed at 1 outside top middle part of valve body, and valve rod 5 is installed in 1 inside embedding that runs through of valve body. The inner wall of the throttle pipe 4 is embedded with a throttle mechanism 6 at a position close to the valve rod 5. The connecting mechanism 7 is installed to the outside bottom of valve rod 5, and feedback mechanism 8 is installed to the inside embedding of feed liquor pipe 2 and drain pipe 3, and throttle mechanism 6 includes adjusting screw 601, fixed fluted disc 602, movable clamp arm 603, rotatory ring gear 604, telescopic toothed plate 605, brake film 606 and flow interceptor 607. The flow isolating plate 607 is uniformly sleeved and mounted at the edge of the bottom end outside the valve rod 5, the fixed gear disc 602 is sleeved and mounted at the top end outside the valve rod 5, the movable clamping arm 603 is rotatably mounted at two sides outside the fixed gear disc 602, the rotary gear ring 604 is welded and mounted at the top of the movable clamping arm 603, and the adjusting screw 601 is penetratingly mounted at the top end of the two rotary gear rings 604 corresponding to the outer wall of the throttle pipe 4. The telescopic toothed plate 605 is clamped and installed at the bottom end of the adjusting screw 601 corresponding to the outer wall of the rotary toothed ring 604, the brake rubber sheet 606 is attached to the inner wall surface of the movable clamping arm 603, and the outer wall of the bottom of the adjusting screw 601 is fixedly connected with the inner wall of the throttle pipe 4 through threads. The two sides of the outer wall of the telescopic toothed plate 605 are meshed with the two rotary toothed rings 604 through the teeth, the outer diameter of the flow isolating plate 607 is equal to half of the inner diameter of the valve body 1, oil flowing into the valve body 1 through the liquid inlet pipe 2 is separated by the flow isolating plates 607 at the bottom end of the valve rod 5, the flow isolating plates 607 are pushed to rotate under the action of flowing impact of the oil, and the adjusting screw 601 is screwed outwards to screw out the telescopic toothed plate 605 upwards. The two movable clamping arms 603 can be tightened by matching the two sides of the outer wall of the retractable toothed plate 605 with the rotary toothed ring 604 at the top ends of the two movable clamping arms 603. The friction between the brake rubber sheet 606 and the fixed gear 602 at the top of the outer part of the valve rod 5 can increase the resistance of the valve rod 5 to rotation and reduce the rotation speed of the baffle 607. Thereby the function of throttling the oil in the valve body 1 is realized. Meanwhile, the friction resistance of the fixed gear 602 is changed by matching with the movable clamping arm 603, so that the range and the precision of the valve body 1 for oil liquid throttling are greatly improved, the device is convenient to use, and the production cost is low.

When the valve works, oil flowing into the valve body 1 through the liquid inlet pipe 2 is separated by the plurality of flow partition plates 607 at the bottom end of the valve rod 5, and the flow partition plates 607 are pushed to rotate under the action of flow impact of the oil. The adjusting screw 601 is screwed outwards to screw out the retractable toothed plate 605 upwards, and the two movable clamping arms 603 can be tightened by matching the meshing between the two sides of the outer wall of the retractable toothed plate 605 and the rotating toothed ring 604 at the top ends of the two movable clamping arms 603. The friction between the brake rubber sheet 606 and the fixed gear 602 at the top end outside the valve rod 5 can increase the resistance of the valve rod 5 during rotation, reduce the rotation speed of the flow isolating plate 607, and throttle the oil inside the valve body 1.

As shown in fig. 5 to 6: the connecting mechanism 7 comprises a connecting chassis 701, a supporting spring 702, a fixing vertical groove 703, a limiting bump 704 and a removal transverse groove 705. The connection chassis 701 is fixedly clamped and installed at the position, close to the top end of the outer flow isolating plate 607, of the outer portion of the valve rod 5, and the supporting spring 702 is sleeved and installed at the position, corresponding to the top end of the connection chassis 701, of the outer portion of the valve rod 5. The fixed vertical groove 703 is arranged at one side of the bottom end of the outer wall of the valve rod 5, the limit bump 704 is fixedly arranged at one side of the inner wall of the connecting chassis 701, and the detaching transverse groove 705 is arranged at one side of the top end of the inner wall of the fixed vertical groove 703. The flow isolating plate 607 is pressed downwards, the limit bump 704 connected with the inner wall of the chassis 701 slides into the bottom of the dismounting transverse groove 705, and the top end of the chassis 701 is supported and fixed by matching with the support spring 702 outside the valve rod 5. The top end of the flow partitioner 607 is firmly installed under the action of the connecting base plate 701, the flow partitioner 607 can be lifted upwards in the same way, and the connecting base plate 701 and the flow partitioner 607 are detached and taken out by matching with the limiting lug 704 sliding into the top of the detaching transverse groove 705, so that the convenience and convenience of detaching, installing and overhauling the flow partitioner 607 are ensured.

In order to increase the connection tightness between the outside of the connecting chassis 701 and the inner wall of the valve body 1 and avoid the upward leakage of oil liquid in the valve body 1, the outside of the connecting chassis 701 and the valve body 1 are fixedly connected through a sealing chuck. The interior of the connecting chassis 701 is fixedly connected with the valve rod 5 through a bearing snap ring. The contact between the bearing snap ring and the valve rod 5 ensures the stability of the valve rod 5 in long-time rotation.

When the device works, the flow isolating plate 607 is pressed downwards, and the limiting lug 704 connected with the inner wall of the bottom plate 701 slides into the bottom of the dismounting transverse groove 705. And the top end of the connecting chassis 701 is supported and fixed by matching with a supporting spring 702 outside the valve rod 5, so that the top end of the flow isolating plate 607 is firmly installed under the action of the connecting chassis 701. Similarly, the flow divider 607 can be pulled upward, and the connecting bottom plate 701 and the flow divider 607 can be detached and taken out by sliding the limit protrusion 704 into the top of the detaching transverse groove 705.

As shown in fig. 7: the feedback mechanism 8 includes a flow stabilizing liner 801, a one-way valve plug 802, a movable valve plate 803, a compression spring 804, a bleed liner 805, and a flow monitor 806. The steady flow inner container 801 is embedded in one side of the inner part of the liquid inlet pipe 2, and the one-way valve plug 802 is movably sleeved on one side of the outer part of the steady flow inner container 801. The movable valve plate 803 is movably sleeved inside the steady flow inner container 801, the compression spring 804 is sleeved between one side of the outside of the movable valve plate 803 and the bottom end of the one-way valve plug 802, and the drainage inner container 805 is sleeved inside the liquid outlet pipe 3. The flow monitoring meters 806 are embedded in two sides of the inner wall of the drainage liner 805, the one-way valve plugs 802 are arc-shaped end caps, the inside of the steady flow liner 801 is arranged in a spindle shape, and the outer wall of the steady flow liner 801 is fixedly connected with the liquid inlet pipe 2 through bolts. The inside one-way valve plug 802 of stationary flow inner bag 801 can carry out preliminary buffering stationary flow to the inside fluid that gets into feed liquor pipe 2 to cooperation compression spring 804 can carry out the secondary to fluid buffering stationary flow to the support of activity valve plate 803, slides right through activity valve plate 803 and enlarges stationary flow inner bag 801 internal diameter, has solved that fluid flow is great, causes the comparatively difficult problem of later stage throttle. And the flow monitoring meter 806 in the internal discharge liner 805 of the liquid outlet pipe 3 can be matched to detect and feed back the oil flow discharged through the valve body 1, so that the throttling force inside the valve body 1 can be correspondingly changed, and the scientificity of the valve body 1 for oil throttling is improved.

In order to lubricate the outer top end of the valve rod 5 at the position of the throttle pipe 4, a lubricating oil nozzle 9 is embedded at the outer top end of the throttle pipe 4 near the valve rod 5. In order to ensure the firmness and the tightness of the connection between the liquid inlet pipe 2 and the liquid outlet pipe 3 outside the valve body 1, fixing flanges 10 are welded on two sides of the outside of the valve body 1, and waterproof sealing rubber rings are sleeved inside the fixing flanges 10.

During operation, can carry out preliminary buffering stationary flow to the inside fluid that gets into feed liquor pipe 2 by the inside one-way valve plug 802 of stationary flow inner bag 801 to cooperation compression spring 804 can carry out secondary buffering stationary flow to fluid to the support of movable valve plate 803, slides right through movable valve plate 803 and enlarges stationary flow inner bag 801 internal diameter, has solved that fluid flow is great, causes the comparatively difficult problem of later stage throttle. And the flow rate of the oil discharged through the valve body 1 can be detected and fed back by matching with the flow rate monitor 806 in the discharge liner 805 in the liquid outlet pipe 3.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A pipeline throttle valve comprises a valve body (1), a liquid inlet pipe (2), a liquid outlet pipe (3) and a throttle pipe (4), wherein the liquid inlet pipe (2) is fixedly clamped and mounted on one side of the outside of the valve body (1), the liquid outlet pipe (3) is fixedly clamped and mounted on the other side of the outside of the valve body (1), and the throttle pipe (4) is fixedly embedded and mounted in the middle of the top end of the outside of the valve body (1);

the liquid flow regulating valve is characterized in that a valve rod (5) penetrates through and is embedded in the valve body (1), a throttling mechanism (6) is embedded in the position, close to the valve rod (5), of the inner wall of the throttling pipe (4), a connecting mechanism (7) is installed at the bottom end of the outer portion of the valve rod (5), a feedback mechanism (8) is embedded in the liquid inlet pipe (2) and the liquid outlet pipe (3), the throttling pipe (4) is used for throttling liquid flowing through the liquid inlet pipe (2) in the valve body (1), the connecting mechanism (7) is used for fixedly connecting the throttling pipe (4) with the bottom end of the valve rod (5), and the feedback mechanism (8) is used for regulating and feeding back the flow of liquid discharged from the valve body (1);

the throttling mechanism (6) comprises an adjusting screw rod (601), a fixed gear disc (602), a movable clamping arm (603), a rotary gear ring (604), a telescopic toothed plate (605), a brake rubber sheet (606) and a flow isolating plate (607), wherein the flow isolating plate (607) is uniformly sleeved and installed at the edge of the bottom end outside the valve rod (5), the fixed gear disc (602) is sleeved and installed at the top end outside the valve rod (5), the movable clamping arm (603) is rotatably installed at two sides outside the fixed gear disc (602), the rotary toothed ring (604) is welded and installed at the top of the movable clamping arm (603), the adjusting screw rod (601) is penetratingly installed at the top end position of the rotary toothed ring (604) corresponding to the outer wall of the throttling pipe (4), and the telescopic toothed plate (605) is clamped and installed at the bottom end of the adjusting screw rod (601) corresponding to the outer wall position of the rotary toothed ring (604, the brake rubber sheet (606) is attached to the surface of the inner wall of the movable clamping arm (603) through adhesive, the outer wall of the bottom of the adjusting screw rod (601) is fixedly connected with the inner wall of the throttling pipe (4) through threads, two sides of the outer wall of the telescopic toothed plate (605) are meshed with the two rotary toothed rings (604) through teeth, and the outer diameter of the flow isolating plate (607) is equal to half of the inner diameter of the valve body (1);

coupling mechanism (7) are including connecting chassis (701), supporting spring (702), fixed perpendicular groove (703), spacing lug (704) and tear open and get horizontal groove (705), it installs to connect chassis (701) fixed joint valve rod (5) outside is close to separate outside top position department of flow plate (607), supporting spring (702) cup joint install valve rod (5) outside corresponds connect chassis (701) top position department, fixed perpendicular groove (703) are seted up valve rod (5) outer wall bottom one side, spacing lug (704) fixed mounting be in connect chassis (701) inner wall one side, tear open and get horizontal groove (705) and set up fixed perpendicular groove (703) inner wall top one side.

2. The pipeline throttling valve according to claim 1, characterized in that the connection between the outside of the connection chassis (701) and the valve body (1) is fixed through a sealing chuck, and the connection between the inside of the connection chassis (701) and the valve rod (5) is fixed through a bearing snap ring.

3. The throttling valve for pipes according to claim 1, characterized in that the feedback mechanism (8) comprises a steady flow inner container (801), a one-way valve plug (802), a movable valve plate (803), a compression spring (804), a leakage inner container (805) and a flow monitor meter (806), the steady flow inner container (801) is embedded and arranged at one side inside the liquid inlet pipe (2), the one-way valve plug (802) is movably sleeved and installed on one side of the outside of the steady flow inner container (801), the movable valve plate (803) is movably sleeved and installed inside the steady flow inner container (801), the compression spring (804) is sleeved between one side of the outer part of the movable valve plate (803) and the bottom end of the one-way valve plug (802), the drainage liner (805) is sleeved inside the liquid outlet pipe (3), the flow monitoring meters (806) are embedded and installed on two sides of the inner wall of the drainage liner (805).

4. The pipeline throttling valve according to claim 3, wherein the one-way valve plug (802) is in the shape of an arc-shaped end cap, the steady flow inner container (801) is arranged in a spindle shape, and the outer wall of the steady flow inner container (801) is fixedly connected with the liquid inlet pipe (2) through a bolt.

5. The throttling valve for pipelines according to claim 1, wherein a lubricating oil nozzle (9) is embedded and installed at the position, close to the valve rod (5), of the top end of the outer portion of the throttling pipe (4), fixing flanges (10) are welded and installed on both sides of the outer portion of the valve body (1), and waterproof sealing rubber rings are sleeved and installed inside the fixing flanges (10).