Filtering device for valve and valve

Abstract

The invention relates to the field of pipeline filters, and particularly discloses a filtering device for a valve and the valve, the filtering device comprises a first external threaded pipe, an impeller and a plurality of rotatable filter screens distributed at intervals in the axis direction, and the inner diameters of meshes of the filter screens are gradually reduced from the first end to the second end. In addition, the invention further provides a valve comprising the filtering device, connector pipes are arranged at the two ends of a valve body, and reliable sealing is achieved through a sealing mechanism. Specifically, the sealing mechanism is composed of an elastic sealing ring, a pressing assembly and a flange assembly, good sealing performance is ensured, and the service life is prolonged. The sealing performance of the valve connector is improved while the valve is not prone to being blocked.

Description

Technical Field

[0001] This application relates to the field of pipeline filters, and particularly to a filtering device and a valve for a valve. Background Art

[0002] At present, as a commonly used fluid control device, ball valves are widely used in industrial pipeline systems. Traditional ball valves have a simple structure, small size, and convenient operation, but are prone to leakage risks under high-pressure difference conditions. With the growth of modern industrial demands and the progress of technology, various improved ball valve designs have emerged in the market, such as fixed ball valves, three-way ball valves, etc.

[0003] In related technologies, there are many impurities in some fluids and it is easy to damage the valve during transportation. In order to effectively filter the fluid, current valves usually use a fixed filter screen to intercept impurities. And when the current valve is connected to a water pipe joint, usually a simple sealing ring is clamped between the valve joint and the water pipe joint, and then the flange at the valve joint is bolted to the flange at the water pipe joint to achieve the sealed connection between the valve and the water pipe joint.

[0004] For the above related technologies, there are the following defects: The filter screen in the current valve joint is usually a single-layer filter screen, and the sizes of impurity particles in the fluid are diverse, making it difficult to effectively filter impurities of different sizes. Moreover, the sealed connection structure between the current valve and the water pipe joint is relatively simple, and the sealed connection structure is prone to loosening when enduring external forces such as water pressure for a long time. Summary of the Invention

[0005] In order to facilitate the effective filtration of impurity particles and improve the sealing performance of the valve joint, this application provides a filtering device and a valve for a valve.

[0006] The filtering device and the valve for a valve provided by this application adopt the following technical solutions: A filtering device for a valve, including a first external thread pipe, an impeller, and multiple filter screens. The impeller is rotatably installed inside the first end of the first external thread pipe; The filter screen is detachably installed inside the second end of the first external thread pipe, and multiple filter screens are distributed at intervals along the axial direction of the first external thread pipe; From the first end to the second end of the first external thread pipe, the inner diameter of the mesh holes of the filter screen decreases.

[0007] By adopting the above technical solution, the impeller can generate rotation when the fluid passes through, which helps to stir and disperse impurities and increase the flow rate, thereby improving the filtration efficiency. From the first end to the second end of the first external threaded pipe, the inner diameter of the mesh holes of the filter screen decreases, so that the fluid gradually removes finer impurities during multi-layer filtration, thus improving the filtration efficiency and accuracy.

[0008] A valve includes the above-mentioned valve filtration device, valve body, and sealing mechanism. Joint pipes are provided at both ends of the valve body; the valve filtration device is arranged in the joint pipe, and the first external threaded pipe is screwed to the joint pipe; The sealing mechanism includes an elastic sealing ring, a pressing component, and a flange component. The first end of the elastic sealing ring is coaxially and sealingly connected to the end of the joint pipe away from the valve body; the pressing component is used to press the second end of the elastic sealing ring against the outer wall of the water pipe joint; the flange component includes a limiting flange plate sleeved on the joint pipe.

[0009] By adopting the above technical solution, the valve filtration device enables the joint pipe of the valve body to have an efficient filtration function, can effectively remove impurities in the water, and avoid damage to the valve body caused by impurities in the water. When the joint pipe is connected to the water pipe joint, the first end of the elastic sealing ring is located between the joint pipe and the water pipe joint, thus realizing the first-stage seal between the joint pipe and the water pipe joint. At the same time, since the first end of the elastic sealing ring is coaxially and sealingly connected to one end of the valve body, the second end of the elastic sealing ring can serve as an extension of the joint pipe. At this time, the pressing component presses the second end of the elastic sealing ring against the outer wall of the water pipe joint, and a sealing connection is formed between the second end of the elastic sealing ring and the outer wall of the water pipe joint, thus realizing the second-stage seal between the joint pipe and the water pipe joint. After the limiting flange plate and the connecting flange plate on the water pipe joint are connected by bolts, the two-stage sealing structure will be stabilized and can further improve the sealing performance under the action of pressure. The two-stage sealing structure enables the joint pipe of the valve body to maintain a stable sealing effect for a long time.

[0010] Optionally, the elastic sealing ring includes an inner ring, an end ring, and a tapered pipe, which are coaxially connected in sequence; The inner ring is coaxially arranged in the joint pipe, the end ring is arranged on the side of the joint pipe away from the valve body, and the tapered pipe is arranged outside the joint pipe; The tapered pipe is used to be sleeved on the water pipe joint, and the pressing component is used to press the first end of the tapered pipe against the outer wall of the water pipe joint.

[0011] By adopting the above technical solution, the inner ring is used to define the relative position between the elastic sealing ring and the joint pipe. The end ring is used to seal the gap between the water pipe joint and the joint pipe, forming the first layer of seal. The conical pipe and the pressing assembly cooperate with each other. The pressing assembly presses the first end of the conical pipe against the outer wall of the water pipe joint, forming the second layer of seal.

[0012] Optionally, a plurality of coaxial first annular reinforcing ribs are provided on the end ring.

[0013] By adopting the above technical solution, setting a plurality of coaxial first annular reinforcing ribs can enhance the structural strength of the end ring, prevent deformation or damage caused by uneven stress during use, and thus improve the reliability and service life of the entire valve filtering device.

[0014] Optionally, a plurality of coaxial second annular reinforcing ribs are provided on the conical pipe.

[0015] By adopting the above technical solution, setting a plurality of coaxial second annular reinforcing ribs on the conical pipe effectively enhances the structural strength of the conical pipe, prevents deformation or damage under high-pressure environment, and improves the sealing performance and service life.

[0016] Optionally, the pressing assembly includes a second external threaded pipe, an internal threaded pressing pipe and a plurality of arched pressing plates. The second external threaded pipe is coaxially sleeved on one end of the joint pipe away from the valve body and is connected to the joint pipe; The arched pressing plates are connected to one end of the joint pipe away from the valve body, and the plurality of arched pressing plates are evenly distributed in the circumferential direction of the joint pipe; the internal threaded pressing pipe is screwed to the second external threaded pipe.

[0017] By adopting the above technical solution, the pressing assembly can effectively fix the elastic sealing ring, ensure that it closely fits on the outer wall of the water pipe joint, and thus improve the sealing performance of the valve. Specifically, the second external threaded pipe is coaxially sleeved on one end of the joint pipe away from the valve body and is connected to the joint pipe, making the entire structure more stable. The plurality of arched pressing plates are evenly distributed in the circumferential direction of the joint pipe, which can apply pressure evenly and form a good sealing contact surface between the elastic sealing ring and the water pipe joint. The internal threaded pressing pipe is screwed to the second external threaded pipe, which is convenient for adjustment and installation, and at the same time ensures sufficient pressing force to further enhance the sealing effect.

[0018] Optionally, the flange assembly further includes a collar and a sleeve. The collar is sleeved on the joint pipe between the second external threaded pipe and the valve body; The limiting flange is located on the side of the collar away from the valve body; The sleeve is sleeved on the joint pipe, one end is connected to the limiting flange, and the other end is connected to the collar.

[0019] By adopting the above technical solution, the ferrule and the sleeve cooperate with each other to install the limiting flange on the joint pipe and enable the limiting flange to be close to the interface of the joint pipe, facilitating the subsequent close connection with the connecting flange of the water pipe joint.

[0020] Optionally, a plurality of side reinforcing ribs are connected between the limiting flange and the sleeve.

[0021] By adopting the above technical solution, the connection strength at the limiting flange, the sleeve and the connection between the limiting flange and the sleeve is enhanced.

[0022] Optionally, the flange assembly further includes an elastic member and a sealing insert ring. One end of the second external thread pipe facing the valve body is provided with a coaxial annular accommodating groove; the elastic member is arranged in the annular accommodating groove along the length direction of the joint pipe and is connected to the second external thread pipe at one end; One end of the sealing insert ring is coaxially connected to the ferrule, and the other end is used for inserting into the annular accommodating groove and can be in dynamic sealing connection with the second external thread pipe.

[0023] By adopting the above technical solution, when the limiting flange moves towards the water pipe joint, the elastic member will be compressed. After the limiting flange and the connecting flange of the water pipe joint are connected by bolts, the elastic member will exert a force to pull the limiting flange and the connecting flange apart, so that both the limiting flange and the connecting flange hold the bolts, making the connection between the limiting flange and the connecting flange more stable and not easy to loosen. The sealing insert cooperates with the annular accommodating groove to protect the elastic member and make the elastic member not easily damaged.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. In the present application, the rotation can be generated when the fluid passes through by the setting of the impeller, which helps to stir and disperse impurities and increase the flow rate, improving the filtration efficiency. From the first end to the second end of the first external thread pipe, the inner diameter of the mesh holes of the filter net decreases gradually, so that the fluid gradually removes finer impurities during multi-layer filtration, thereby improving the filtration efficiency and accuracy.

[0025] 2. When the joint pipe is connected to the water pipe joint in the present application, the first end of the elastic sealing ring is located between the joint pipe and the water pipe joint, thus realizing the first-stage seal between the joint pipe and the water pipe joint. Since the first end of the elastic sealing ring is coaxially and hermetically connected to the end of the joint pipe far from the valve body, and the pressing assembly presses the second end of the elastic sealing ring against the outer wall of the water pipe joint, and the second end of the elastic sealing ring is hermetically connected to the outer wall of the water pipe joint, thus realizing the second-stage seal between the joint pipe and the water pipe joint. The two-stage sealing structure enables the joint pipe of the valve body to maintain the sealing effect stably for a long time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 is the overall structural schematic diagram of the embodiment of the present application; Figure 2 is the cross-sectional schematic diagram of the joint pipe part; Figure 3 is the connection structural schematic diagram of the embodiment of the present application and the water pipe joint.

[0028] Reference numerals: 1. Valve body; 11. Joint pipe; 12. Water pipe joint; 121. Connecting flange; 2. Filter device for valve; 21. First external threaded pipe; 22. Filter net; 23. Impeller; 3. Sealing mechanism; 31. Elastic sealing ring; 311. Inner ring; 312. End ring; 3121. First annular reinforcing rib; 313. Tapered pipe; 3131. Second annular reinforcing rib; 32. Pressing component; 321. Second external threaded pipe; 32101. Annular accommodating groove; 322. Arch-shaped pressing plate; 323. Limiting plate; 324. Internal threaded pressing pipe; 33. Flange component; 331. Collar; 332. Sleeve; 333. Limiting flange; 334. Side reinforcing rib; 335. Elastic member; 336. Sealing insertion ring. Specific embodiments

[0029] The following will Figures 1 - 3 further describe the present application in detail.

[0030] The embodiments of the present application disclose a filter device for a valve and a valve.

[0031] Refer to Figure 1 and Figure 2, A filtering device 2 for a valve, comprising a first external threaded pipe 21, an impeller 23 and a plurality of filter meshes 22. The impeller 23 is rotatably installed inside the first end of the first external threaded pipe 21, and the impeller 23 is also detachably connected to the first external threaded pipe 21. A handle is further provided at the installation position of the impeller 23 of the first external threaded pipe 21, and the handle facilitates the taking and screwing of the first external threaded pipe 21. The filter meshes 22 are detachably installed inside the second end of the first external threaded pipe 21, and the plurality of filter meshes 22 are spaced apart along the axial direction of the first external threaded pipe 21. From the first end to the second end of the first external threaded pipe 21, the inner diameter of the mesh holes of the filter meshes 22 decreases. In the embodiment of the present application, the setting of the impeller 23 can generate rotation when the fluid passes through, which helps to stir and disperse impurities and increase the flow rate, thereby improving the filtering efficiency. From the first end to the second end of the first external threaded pipe 21, the inner diameter of the mesh holes of the filter meshes 22 decreases, so that the fluid gradually removes finer impurities when passing through multiple layers of filtration, thereby improving the filtering efficiency and accuracy.

[0032] Refer to Figure 1 , Figure 2 And Figure 3 , A valve, comprising the above-mentioned filtering device 2 for a valve, a valve body 1, and a sealing mechanism 3. Joint pipes 11 are provided at both ends of the valve body 1. The filtering device 2 for a valve is arranged inside the joint pipe 11, and the first external threaded pipe 21 is screwed to the joint pipe 11. The sealing mechanism 3 includes an elastic sealing ring 31, a pressing component 32 and a flange component 33. The first end of the elastic sealing ring 31 is coaxially and sealingly connected to the end of the joint pipe 11 away from the valve body 1. The pressing component 32 is used to press the second end of the elastic sealing ring 31 against the outer side wall of the water pipe joint 12. The flange component 33 includes a limiting flange 333 sleeved on the joint pipe 11. In the embodiment of the present application, the filtering device 2 for a valve enables the joint pipe 11 of the valve body 1 to have an efficient filtering function, which can effectively remove impurities in water and avoid damage to the valve body 1 caused by impurities in water. When the joint pipe 11 is connected to the water pipe joint 12, the first end of the elastic sealing ring 31 is located between the joint pipe 11 and the water pipe joint 12, thereby realizing the first-stage sealing between the joint pipe 11 and the water pipe joint 12. At the same time, since the first end of the elastic sealing ring 31 is coaxially and sealingly connected to one end of the valve body 1, the second end of the elastic sealing ring 31 can serve as an extension of the joint pipe 11. At this time, the pressing component 32 presses the second end of the elastic sealing ring 31 against the outer side wall of the water pipe joint 12, and a sealing connection is formed between the second end of the elastic sealing ring 31 and the outer side wall of the water pipe joint 12, thereby realizing the second-stage sealing between the joint pipe 11 and the water pipe joint 12. After the limiting flange 333 and the connecting flange 121 on the water pipe joint 12 are connected by bolts, both sealing structures will be stabilized and can further improve the sealing performance under the action of pressure. The two sealing structures enable the joint pipe 11 of the valve body 1 to maintain a sealing effect for a long time and stably.

[0033] Reference Figure 1 、 Figure 2 and Figure 3 As shown in FIGS.

[0034] Reference Figure 1 、 Figure 2 and Figure 3 The end ring 312 is provided with a plurality of coaxial first annular reinforcing ribs 3121. In the embodiment of the present application, the arrangement of a plurality of coaxial first annular reinforcing ribs 3121 can enhance the structural strength of the end ring 312, prevent deformation or damage caused by uneven stress during use, and thus improve the reliability and service life of the entire valve filter device 2.

[0035] Reference Figure 1 、 Figure 2 and Figure 3 The tapered tube 313 is provided with a plurality of coaxial second annular reinforcing ribs 3131. In the embodiment of the present application, the arrangement of a plurality of coaxial second annular reinforcing ribs 3131 on the tapered tube 313 effectively enhances the structural strength of the tapered tube 313, prevents deformation or damage under high-pressure environments, and improves the sealing performance and service life.

[0036] Reference Figure 1 、 Figure 2 and Figure 3, the pressing component 32 includes a second external threaded pipe 321, an internal threaded pressing pipe 324, and a plurality of arched pressing plates 322. The second external threaded pipe 321 is coaxially sleeved on one end of the joint pipe 11 away from the valve body 1 and is connected to the joint pipe 11. The arched pressing plates 322 are connected to one end of the joint pipe 11 away from the valve body 1, and the plurality of arched pressing plates 322 are evenly distributed in the circumferential direction of the joint pipe 11. The internal threaded pressing pipe 324 is screwed to the second external threaded pipe 321. In the embodiment of the present application, the pressing component 32 can effectively fix the elastic sealing ring 31 to ensure that it closely fits on the outer side wall of the water pipe joint 12, thereby improving the sealing performance of the valve. Specifically, the second external threaded pipe 321 is coaxially sleeved on one end of the joint pipe 11 away from the valve body 1 and is connected to the joint pipe 11, making the whole structure more stable. The plurality of arched pressing plates 322 are evenly distributed in the circumferential direction of the joint pipe 11, which can apply pressure evenly to form a good sealing contact surface between the elastic sealing ring 31 and the water pipe joint 12. The internal threaded pressing pipe 324 is screwed to the second external threaded pipe 321, which is convenient for adjustment and installation, and at the same time ensures sufficient pressing force to further enhance the sealing effect.

[0037] Refer to Figure 1 , Figure 2 and Figure 3 , the flange assembly 33 further includes a collar 331 and a sleeve 332. The collar 331 is sleeved on the joint pipe 11 between the second external threaded pipe 321 and the valve body 1. The limiting flange 333 is located on the side of the collar 331 away from the valve body 1. The sleeve 332 is sleeved on the joint pipe 11, one end is connected to the limiting flange 333, and the other end is connected to the collar 331. In the embodiment of the present application, the collar 331 and the sleeve 332 cooperate to install the limiting flange 333 on the joint pipe 11 and enable the limiting flange 333 to be close to the interface of the joint pipe 11, facilitating the subsequent close connection with the connection flange 121 of the water pipe joint 12.

[0038] Refer to Figure 1 , Figure 2 and Figure 3 , a plurality of side reinforcing ribs 334 are connected between the limiting flange 333 and the sleeve 332. In the embodiment of the present application, the connection strength of the limiting flange 333, the sleeve 332, and the connection between the limiting flange 333 and the sleeve 332 is enhanced.

[0039] Refer to Figure 1 , Figure 2 and Figure 3, the flange assembly 33 further includes an elastic member 335 and a sealing insert ring 336. One end of the second external threaded pipe 321 facing the valve body 1 is provided with a coaxial annular receiving groove 32101. The elastic member 335 is arranged in the annular receiving groove 32101 along the length direction of the joint pipe 11, and one end is connected to the second external threaded pipe 321. One end of the sealing insert ring 336 is coaxially connected to the collar 331, and the other end is used to insert into the annular receiving groove 32101 and can be in dynamic sealing connection with the second external threaded pipe 321. In the embodiment of the present application, when the limiting flange 333 moves towards the water pipe joint 12, the elastic member 335 will be compressed. After the limiting flange 333 and the connecting flange 121 of the water pipe joint 12 are bolted together, the elastic member 335 will exert a force to pull the limiting flange 333 and the connecting flange 121 apart, so that the limiting flange 333 and the connecting flange 121 both hold the bolts, making the connection between the limiting flange 333 and the connecting flange 121 more stable and not easy to loosen. The sealing insert and the annular receiving groove 32101 are used to protect the elastic member 335 so that the elastic member 335 is not easily damaged.

[0040] The implementation principle of a valve filtering device 2 and a valve in an embodiment of the present application is as follows: The setting of the impeller 23 can generate rotation when the fluid passes through, which helps to stir and disperse impurities and increase the flow rate, improving the filtering efficiency. From the first end to the second end of the first external threaded pipe 21, the inner diameter of the mesh holes of the filter net 22 decreases, so that the fluid gradually removes finer impurities during multi-layer filtration, thereby improving the filtering efficiency and accuracy.

[0041] The valve filtering device 2 enables the joint pipe 11 of the valve body 1 to have an efficient filtering function, which can effectively remove impurities in water and prevent the impurities in water from damaging the valve body 1. When the joint pipe 11 is connected to the water pipe joint 12, the first end of the elastic sealing ring 31 is located between the joint pipe 11 and the water pipe joint 12, thus realizing the first-stage sealing between the joint pipe 11 and the water pipe joint 12. At the same time, since the first end of the elastic sealing ring 31 is coaxially sealed with one end of the valve body 1, the second end of the elastic sealing ring 31 can be used as an extension of the joint pipe 11. At this time, the pressing assembly 32 presses the second end of the elastic sealing ring 31 against the outer wall of the water pipe joint 12, and the second end of the elastic sealing ring 31 is in sealing connection with the outer wall of the water pipe joint 12, thereby realizing the second-stage sealing between the joint pipe 11 and the water pipe joint 12. After the limiting flange 333 and the connecting flange 121 on the water pipe joint 12 are bolted together, the two-stage sealing structure will both stabilize and can further improve the sealing performance under the action of pressure. The two-stage sealing structure enables the joint pipe 11 of the valve body 1 to maintain a sealing effect for a long time and stably.

[0042] Unless otherwise defined, the technical terms or scientific terms used in this application shall have the ordinary meanings as understood by those of ordinary skill in the art to which this application pertains. The terms "first", "second", "third" and similar terms used in the specification and claims of this application do not denote any order, quantity or importance, but are merely used to distinguish different components. Similar terms such as "a" or "an" do not denote a quantity limitation, but rather indicate the presence of at least one. Similar terms such as "comprising" or "including" mean that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, and do not exclude other elements or items. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationships may also change accordingly.

[0043] The above are all optional embodiments of this application, and do not limit the protection scope of this application accordingly. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A filter device (2) for a valve, characterized in that: It comprises a first externally threaded tube (21), an impeller (23) and a plurality of filter screens (22), wherein the impeller (23) is rotatably mounted on the inner side of a first end of the first externally threaded tube (21); The filter screen (22) is detachably mounted on the inner side of the second end of the first externally threaded tube (21), and a plurality of the filter screens (22) are spaced apart and distributed along the axial direction of the first externally threaded tube (21); From the first end to the second end of the first externally threaded tube (21), the inner diameter of the mesh of the filter screen (22) decreases.

2. A valve, characterized in that: The valve filter (2) comprises the valve filter device (2) as claimed in claim 1, a valve body (1), and a sealing mechanism (3), wherein both ends of the valve body (1) are provided with joint pipes (11); the valve filter device (2) is arranged in the joint pipe (11), and the first externally threaded pipe (21) is threadedly connected to the joint pipe (11); The sealing mechanism (3) comprises an elastic sealing ring (31), a pressing assembly (32) and a flange assembly (33); a first end of the elastic sealing ring (31) and an end of the joint pipe (11) away from the valve body (1) are coaxially sealed and connected; the pressing assembly (32) is used to press the second end of the elastic sealing ring (31) against the outer wall of the water pipe joint (12); and the flange assembly (33) comprises a limiting flange (333) sleeved on the joint pipe (11).

3. A valve according to claim 2, characterized in that: The elastic sealing ring (31) comprises an inner ring (311), an end ring (312) and a tapered tube (313), wherein the inner ring (311), the end ring (312) and the tapered tube (313) are coaxially connected in sequence; The inner ring (311) is coaxially arranged inside the joint pipe (11), the end ring (312) is arranged on a side of the joint pipe (11) away from the valve body (1), and the tapered pipe (313) is arranged outside the joint pipe (11); The tapered tube (313) is used to be sleeved on the water pipe joint (12), and the pressing assembly (32) is used to press the first end of the tapered tube (313) onto the outer side wall of the water pipe joint (12).

4. A valve according to claim 3, characterized in that: The end ring (312) is provided with a plurality of coaxial first annular reinforcing ribs (3121).

5. A valve according to claim 3, characterized in that: The conical tube (313) is provided with a plurality of coaxial second annular reinforcing ribs (3131).

6. A valve according to claim 3, characterized in that: The clamping assembly (32) comprises a second externally threaded tube (321), an internally threaded pressing tube (324) and a plurality of arched pressing plates (322); the second externally threaded tube (321) is coaxially sleeved on an end of the joint tube (11) away from the valve body (1) and connected to the joint tube (11); The arched pressure plate (322) is connected to an end of the joint pipe (11) away from the valve body (1), and a plurality of the arched pressure plates (322) are evenly distributed in the circumferential direction of the joint pipe (11); the internally threaded pressure pipe (324) is threadedly connected to the second externally threaded pipe (321).

7. A valve according to claim 6, characterized in that: The flange assembly (33) further comprises a collar (331) and a sleeve (332); the collar (331) is sleeved on the joint pipe (11) between the second externally threaded pipe (321) and the valve body (1); The limiting flange (333) is located on a side of the collar (331) away from the valve body (1); The sleeve (332) is sleeved on the joint pipe (11), one end of which is connected to the limiting flange (333) and the other end of which is connected to the sleeve ring (331).

8. A valve according to claim 7, characterized in that: A plurality of side reinforcing ribs (334) are connected between the limiting flange (333) and the sleeve (332).

9. A valve according to claim 8, characterized in that: The flange assembly (33) further comprises an elastic member (335) and a sealing insert ring (336); a coaxial annular receiving groove (32101) is provided at one end of the second externally threaded tube (321) facing the valve body (1); the elastic member (335) is arranged in the annular receiving groove (32101) in the length direction of the joint tube (11), and one end is connected to the second externally threaded tube (321); One end of the sealing insert ring (336) is coaxially connected to the sleeve ring (331), and the other end is used to be inserted into the annular receiving groove (32101) and can be dynamically sealed with the second externally threaded tube (321).

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