A tee valve

Abstract

The utility model relates to valve technical field discloses a tee bend valve. The tee bend valve includes valve body, and the valve body is made of engineering plastics and includes three intercommunication branch pipes, and the end of two branch pipes is provided with metal joint, and the metal joint is used for being connected with external pipeline thread, and each metal joint can be connected in the end of branch pipe through injection moulding or baffle circle, and another branch pipe is provided with ball valve assembly, and the ball valve assembly is used for switching the on-off of fluid in the branch pipe. The tee bend valve provided by the utility model adopts split type structure, that is, the form of engineering plastic valve body plus metal joint, can solve the problems of easy heavy metal precipitation and high cost of full copper tee bend valve in the prior art, and can solve the problem of low strength of full plastic tee bend valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a three-way valve. Background Technology

[0002] In household appliances, three-way valves are commonly used to connect multiple pipelines, primarily serving the functions of diverting, connecting, and switching flow. Traditional three-way valves connect to external pipelines via threads on the valve body. However, current three-way valves are often made entirely of brass or plastic. All-brass three-way valves pose a risk of heavy metal leaching, which can harm human health, and are also more expensive, thus requiring urgent improvement. All-plastic three-way valves, on the other hand, have lower strength than all-brass valves, resulting in insufficient torque for demanding applications. Furthermore, the external threads of the plastic valve body are prone to stripping and failure during pipeline installation, leading to reduced product reliability.

[0003] Therefore, there is an urgent need to provide a three-way valve to solve the above problems. Utility Model Content

[0004] The purpose of this invention is to provide a three-way valve that can solve the problems of heavy metal leaching and high cost of all-copper three-way valves in the prior art, as well as the problem of low strength of all-plastic three-way valves.

[0005] This utility model is achieved through the following technical solution:

[0006] A three-way valve includes a valve body made of engineering plastic and comprising three interconnected branch pipes, wherein two of the branch pipes are provided with metal connectors at their ends for threaded connection to external pipelines, each metal connector being connected to the end of the branch pipe by injection molding or by a retaining ring, and a ball valve assembly is provided in the other branch pipe for switching the flow of fluid in the branch pipe.

[0007] As an alternative, one of the metal connectors is a metal insert, and the other metal connector is a union nut. The metal insert is injection molded onto the outer or inner circumference of the corresponding branch pipe. The union nut is connected to the outer circumference of the corresponding branch pipe via a retaining ring. A first limiting groove is formed on the outer wall of the branch pipe along its circumference, and a second limiting groove is formed on the inner wall of the union nut along its circumference. The retaining ring can be simultaneously confined within the first limiting groove and the second limiting groove.

[0008] As an optional solution, both metal connectors are metal inserts, and the two metal inserts are respectively injection molded onto the outer periphery of the corresponding branch pipe;

[0009] Alternatively, the two metal inserts are respectively injection molded onto the inner circumference of the corresponding branch pipe;

[0010] Alternatively, one of the metal inserts may be injection molded onto the outer periphery of the corresponding branch pipe, and the other metal insert may be injection molded onto the inner periphery of the corresponding branch pipe.

[0011] As an alternative, the circumferential surface of the metal insert that abuts against the branch pipe is provided with an annular waterproof block, and the circumferential surface of the branch pipe that abuts against the metal insert is provided with a waterproof groove that fits into the waterproof block.

[0012] As an optional solution, the number of waterproof blocks is set to multiple, and the multiple waterproof blocks are spaced apart along the axial direction of the metal insert. The number of waterproof grooves is set to multiple and they are fitted into the waterproof blocks one by one.

[0013] As an optional solution, both the waterproof block and the waterproof groove have dovetail-shaped cross-sections.

[0014] As an optional solution, both metal joints are union nuts, which are connected to the outer periphery of the corresponding branch pipe through the retaining ring. A first limiting groove is formed on the outer side wall of the branch pipe along its circumference, and a second limiting groove is formed on the inner side wall of the union nut along its circumference. The retaining ring can be simultaneously confined within the first limiting groove and the second limiting groove.

[0015] As an optional solution, the valve body includes a straight pipe and a bypass pipe, the bypass pipe being perpendicularly connected to the straight pipe to form three branch pipes, the two ends of the straight pipe being respectively connected to the metal joints, and the ball valve assembly being disposed inside the bypass pipe.

[0016] As an alternative, the straight pipe has reinforcing ribs on its outer wall located between the two metal joints.

[0017] As an alternative, the system also includes a valve cover, one end of which is connected to the port of the bypass pipe and seals the ball valve assembly inside the bypass pipe. The other end of the valve cover is provided with a quick-connect fitting for connecting to an external pipeline.

[0018] The beneficial effects of this utility model are as follows:

[0019] This invention provides a three-way valve with a split structure, consisting of an engineering plastic valve body and metal fittings. This design solves the problems of heavy metal leaching and high cost associated with all-copper three-way valves, as well as the low strength of all-plastic three-way valves. The valve uses metal fittings at the threaded connection points with external pipelines, significantly improving thread strength and torque resistance. Each metal fitting connects to its corresponding branch pipe via injection molding or a retaining ring, rather than a threaded connection, avoiding the risk of thread stripping failure when connecting external pipelines or metal fittings to plastic branch pipes. This satisfies installation and usage requirements and improves product reliability. Furthermore, a ball valve assembly is installed in another branch pipe, integrating the ball valve's function into the three-way valve. This allows for switching the flow state within that branch pipe, enabling users to open or close the ball valve assembly as needed, meeting more usage requirements and enhancing the user experience. Attached Figure Description

[0020] To more clearly and understandably illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of the three-way valve provided in Embodiment 1 of this utility model;

[0022] Figure 2 This is a first sectional view of the three-way valve provided in Embodiment 1 of this utility model;

[0023] Figure 3 This is a second sectional view of the three-way valve provided in Embodiment 1 of this utility model;

[0024] Figure 4 This is a cross-sectional view of the three-way valve provided in Embodiment 2 of this utility model;

[0025] Figure 5 This is a cross-sectional view of the three-way valve provided in Embodiment 3 of this utility model;

[0026] Figure 6 This is a cross-sectional view of the three-way valve provided in Embodiment 4 of this utility model;

[0027] Figure 7 This is a cross-sectional view of the three-way valve provided in Embodiment 5 of this utility model;

[0028] Figure 8 This is a cross-sectional view of the three-way valve provided in Embodiment Six of this utility model.

[0029] In the picture:

[0030] 1. Valve body; 11. Straight pipe; 111. First limiting groove; 112. Waterproof groove; 113. Reinforcing rib; 12. Bypass pipe; 13. Mounting pipe; 2. Metal connector; 21. Metal insert; 211. Waterproof block; 22. Union nut; 221. Second limiting groove; 3. Retaining ring; 4. Ball valve assembly; 41. Valve core; 411. Through hole; 42. Valve stem; 43. Handle; 44. Valve seat; 5. Valve cover; 6. Quick connector; 7. Sealing gasket. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0032] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0034] In the description of this embodiment, the terms "upper," "lower," "left," and "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0035] like Figure 1and Figure 2 As shown, this embodiment provides a three-way valve, including a valve body 1 made of engineering plastic and comprising three interconnected branch pipes. Two of the branch pipes have metal connectors 2 at their ends for connection to external pipelines. Each metal connector 2 can be injection molded or connected to the end of a branch pipe via a retaining ring 3. A ball valve assembly 4 is disposed within the third branch pipe for switching the flow of fluid within that branch pipe. The metal connector 2 can be made of copper.

[0036] The three-way valve provided in this embodiment adopts a split structure, namely an engineering plastic valve body 1 plus a metal connector 2. This solves the problems of heavy metal leaching and high cost of all-copper three-way valves in the prior art, as well as the low strength of all-plastic three-way valves. The three-way valve uses a metal connector 2 at the point where it needs to connect to the external pipeline threadedly, which greatly improves the strength and torque resistance of the thread. Furthermore, each metal connector 2 is connected to the corresponding branch pipe via injection molding or a retaining ring 3, rather than a threaded connection. This avoids the risk of thread stripping failure when the external pipeline or metal connector 2 is threaded to the plastic branch pipe, thus meeting installation and usage requirements and improving product reliability. In addition, a ball valve assembly 4 is installed in another branch pipe, so that the three-way valve also integrates the function of the ball valve assembly 4, which can switch the on / off state of the fluid in that branch pipe. Users can close or open the ball valve assembly 4 as needed to meet more usage requirements and improve the user experience.

[0037] Specifically, such as Figure 2 As shown, the valve body 1 includes a straight pipe 11 and a bypass pipe 12. The bypass pipe 12 is perpendicularly connected to the straight pipe 11 to form three branches, i.e., the straight pipe 11 is divided into two branches, and the bypass pipe 12 is the other branch. Metal connectors 2 are connected to both ends of the straight pipe 11. A ball valve assembly 4 is installed inside the bypass pipe 12. The bypass pipe 12 is a selectively open channel, and the straight pipe 11 is a normally open channel. In other optional embodiments, metal connectors 2 can be installed at the ends of any two branches, and the ball valve assembly 4 can be installed inside the other branch. In other optional embodiments, the straight pipe 11 and the bypass pipe 12 can also be connected at other angles, as long as communication is achieved; no specific limitations are made here.

[0038] In this embodiment, as Figure 2As shown, one of the metal connectors 2 is a metal insert 21, and the other metal connector 2 is a union nut 22. The metal insert 21 is injection molded onto the outer periphery of the corresponding branch pipe. The metal insert 21 has external threads and is connected to the external pipeline through its external threads. The union nut 22 is connected to the outer periphery of the corresponding branch pipe through a retaining ring 3. A first limiting groove 111 is provided on the outer wall of the branch pipe along its circumference, and a second limiting groove 221 is provided on the inner wall of the union nut 22 along its circumference. The retaining ring 3 can be simultaneously limited within the first limiting groove 111 and the second limiting groove 221. The union nut 22 has internal threads and is connected to the external pipeline through its internal threads.

[0039] In this way, the three-way valve uses an externally embedded metal insert 21 and a union nut 22 at the locations where it needs to connect to the external pipeline threadedly. This greatly improves the strength and torque resistance of the thread. Furthermore, the metal insert 21 is connected to the corresponding branch pipe through injection molding, and the union nut 22 is connected to the corresponding branch pipe through a retaining ring 3, rather than through a threaded connection. This avoids the risk of thread stripping failure when the metal connector 2 is connected to the plastic branch pipe thread. The installation and use requirements are met, and the reliability of the product is improved.

[0040] For the metal insert 21, during manufacturing, the metal insert 21 is pre-fixed in an appropriate position in the injection mold, and then the plastic is injected for molding. After the mold is opened, the metal insert 21 is tightly embedded in the plastic by the cooled and solidified plastic, thus obtaining the valve body 1 with the metal insert 21, which has strong structural stability.

[0041] Optionally, such as Figure 2 As shown, an annular waterproof block 211 is provided on the inner circumferential surface of the metal inlay 21 where it abuts against the branch pipe, and a waterproof groove 112 is provided on the outer circumferential surface of the branch pipe where it abuts against the metal inlay 21, which fits into the waterproof block 211. The annular waterproof block 211 and the annular waterproof groove 112 fit tightly together to achieve a sealing and leak-proof effect, and at the same time, to prevent the metal inlay 21 from falling off.

[0042] Optionally, multiple waterproof blocks 211 are provided, spaced apart along the axial direction of the metal insert 21. Multiple waterproof grooves 112 are provided, each corresponding to one of the waterproof blocks 211. The close fit between the multiple waterproof blocks 211 and the multiple waterproof grooves 112 ensures a stronger bond between the metal insert 21 and the valve body 1, while also extending the path of water flow, making it more difficult to penetrate and effectively preventing leakage. The specific number of waterproof blocks 211 and waterproof grooves 112 can be two, three, or more, depending on actual needs, and is not specifically limited here.

[0043] Optionally, such as Figure 2As shown, both the waterproof block 211 and the waterproof groove 112 have dovetail-shaped cross-sections, and the inner circle of the waterproof block 211 is wider than the outer circle. When the waterproof block 211 and the waterproof groove 112 of this shape are fitted together, water flow is difficult to penetrate, and the seepage prevention effect is relatively good.

[0044] For the union nut 22, during installation, the retaining ring 3 can be first locked in the first limiting groove 111 of the branch pipe, and then one end of the union nut 22 can be fitted onto the outside of the branch pipe. Then, the union nut 22 can be gradually pushed inward. During the pushing process, the outer ring of the retaining ring 3 gradually gets into the second limiting groove 221 of the inner ring of the union nut 22 along the guide slope at the end of the union nut 22, thereby achieving the purpose of connecting the union nut 22 and the branch pipe. The installation and disassembly are convenient and quick.

[0045] It should be noted that the retaining ring 3 is a common standard part in the prior art. The retaining ring 3 has an adjustment opening to facilitate elastic adjustment. In this embodiment, the cross-section of the retaining ring 3 is circular. Of course, in other embodiments, the cross-section of the retaining ring 3 can also be rectangular.

[0046] Optionally, such as Figure 2 As shown, a sealing gasket 7 is provided inside the union nut 22. The sealing gasket 7 is a flat gasket. When the external pipe thread is tightened into the union nut 22, the external pipe squeezes the sealing gasket 7, so that one side of the sealing gasket 7 abuts against the end face of the branch pipe, forming a sealing effect to prevent fluid leakage, and there is no need to wrap Teflon tape.

[0047] In an optional embodiment, such as Figure 1 As shown, a reinforcing rib 113 is provided on the outer wall of the straight pipe 11 located between the two metal joints 2. It can be understood that the straight pipe 11 is the main channel and is relatively long, making it prone to bending under stress. Therefore, providing a reinforcing rib 113 on the outside of this part can enhance the structural strength of the straight pipe 11 and reduce the risk of bending deformation.

[0048] Optionally, for ball valve assembly 4, such as Figure 2 and Figure 3As shown, the device includes a valve core 41, a valve stem 42, and a handle 43. The valve core 41 is spherical and is located inside the bypass pipe 12. The valve core 41 has a through hole 411 that can communicate with the channel inside the bypass pipe 12. A mounting pipe 13 is vertically arranged around the bypass pipe 12 and is connected to it. One end of the valve stem 42 extends into the mounting pipe 13 and is connected to the valve core 41. The other end of the valve stem 42 extends to the outside of the mounting pipe 13 and is connected to the handle 43. Rotating the handle 43 causes the valve stem 42 to rotate, which in turn opens or closes the valve core 41. Specifically, when the valve core 41 is fully open, the center of the through hole 411 of the valve core 41 and the center of the inner channel of the bypass pipe 12 are completely aligned, thus enabling fluid flow. By rotating the valve stem 42, the valve core 41 can be rotated, which adjusts the overlapping area of ​​the through hole 411 and the inner channel of the bypass pipe 12, thereby adjusting the flow rate. When the through hole 411 is perpendicular to the axis of the inner channel of the bypass pipe 12, the fluid in the pipe channel can be blocked, thus closing the valve core 41.

[0049] like Figure 2 As shown, the ball valve assembly 4 also includes two valve seats 44, which are disposed in the bypass pipe 12 and respectively abut against both sides of the valve core 41, thereby achieving the limiting installation of the valve core 41 and ensuring a certain sealing effect.

[0050] refer to Figure 2 The three-way valve also includes a valve cover 5, one end of which is connected to the port of the bypass pipe 12 and abuts against one of the valve seats 44, thereby sealing the two valve seats 44 and the valve core 41 of the ball valve assembly 4 inside the bypass pipe 12. The other end of the valve cover 5 is internally fitted with a quick-connect fitting 6 for connecting to an external pipeline. Connecting to an external pipeline via the quick-connect fitting 6 is the most convenient plug-and-play connection method, which can be connected and disconnected without tools, saving time and labor costs.

[0051] In an optional embodiment, such as Figure 2 As shown, the quick-connect coupling 6 can be selected as a quick-connect claw. One end of the quick-connect claw has multiple elastic claws that pass through the valve cover 5. These claws retract inwards, and the external pipeline passes through the quick-connect claws from the bottom and extends into the valve cover 5. The pipeline pushes the claws outwards, thus firmly holding the external pipeline in place and preventing it from falling out. An O-ring is installed inside the valve cover 5. After the external pipeline passes through the valve cover 5, it compresses the O-ring, achieving a sealing effect and minimizing the risk of leakage.

[0052] In another optional embodiment, the quick connector 6 can also be a common pagoda connector, which is suitable for connection with a hose. The hose is fitted over the outside of the pagoda connector, and the pagoda-shaped protrusion on the pagoda structure forms an interference fit with the pipeline, thereby achieving a locking effect.

[0053] Example 2

[0054] This embodiment also provides a three-way valve, which has a basically the same structure as the three-way valve provided in Embodiment 1. The similarities will not be repeated here. The differences are as follows: Figure 4 As shown, one of the metal connectors 2 is a metal insert 21, and the other metal connector 2 is a union nut 22. The metal insert 21 is injection molded onto the inner circumference of the corresponding branch pipe. The metal insert 21 has an internal thread and is connected to the external pipeline through its internal thread. The union nut 22 is connected to the outer circumference of the corresponding branch pipe through a retaining ring 3. A first limiting groove 111 is provided on the outer wall of the branch pipe along its circumference, and a second limiting groove 221 is provided on the inner wall of the union nut 22 along its circumference. The retaining ring 3 can be simultaneously limited within the first limiting groove 111 and the second limiting groove 221. The union nut 22 has an internal thread and is connected to the external pipeline through its internal thread.

[0055] In this way, the three-way valve uses embedded metal inserts 21 and union nuts 22 at the locations where it needs to connect to the external pipeline threadedly, which greatly improves the strength and torque resistance of the threads. Furthermore, the metal inserts 21 are connected to the corresponding branch pipes through injection molding, and the union nuts 22 are connected to the corresponding branch pipes through retaining rings 3, rather than through threaded connections. This avoids the risk of thread stripping failure when the metal connector 2 is connected to the plastic branch pipe thread, thus meeting the requirements for installation and use and improving the reliability of the product.

[0056] Example 3

[0057] This embodiment also provides a three-way valve, which has a basically the same structure as the three-way valve provided in Embodiment 1. The similarities will not be repeated here. The differences are as follows: Figure 5 As shown, both metal connectors 2 are metal inserts 21. The two metal inserts 21 are respectively injection molded on the outer periphery of the corresponding branch pipe. Both metal inserts 21 have external threads, and the two metal inserts 21 are connected to the external pipeline at the corresponding end through their respective external threads.

[0058] In this way, the three-way valve uses an external metal insert 21 at all the locations where it needs to be threaded to the external pipeline, which greatly improves the strength and torque resistance of the thread. Furthermore, the metal insert 21 is connected to the corresponding branch pipe by injection molding instead of threaded connection, which avoids the risk of thread stripping failure when the metal connector 2 is connected to the plastic branch pipe thread. The installation and use requirements are met, and the reliability of the product is improved.

[0059] Example 4

[0060] This embodiment also provides a three-way valve, which has a basically the same structure as the three-way valve provided in Embodiment 1. The similarities will not be repeated here. The differences are as follows: Figure 6 As shown, two metal inserts 21 are respectively injection molded on the inner circumference of the corresponding branch pipe. Both metal inserts 21 have internal threads, and the two metal inserts 21 are connected to the external pipeline at the corresponding end through their respective internal threads.

[0061] In this way, the three-way valve uses embedded metal inserts 21 at the locations where it needs to be threaded to external pipelines, which greatly improves the strength and torque resistance of the threads. Furthermore, the metal inserts 21 are connected to the corresponding branch pipes through injection molding rather than threaded connection, which avoids the risk of thread stripping failure when the metal connector 2 is connected to the plastic branch pipe thread. The installation and use requirements are met, and the reliability of the product is improved.

[0062] Example 5

[0063] This embodiment also provides a three-way valve, which has a basically the same structure as the three-way valve provided in Embodiment 1. The similarities will not be repeated here. The differences are as follows: Figure 7 As shown, one of the metal inserts 21 is injection molded on the outer periphery of the corresponding branch pipe. The metal insert 21 has an external thread and is connected to the external pipeline through its external thread. The other metal insert 21 is injection molded on the inner periphery of the corresponding branch pipe. The metal insert 21 has an internal thread and is connected to the external pipeline through its internal thread.

[0064] In this way, the three-way valve uses embedded metal inserts 21 and external metal inserts 21 at the locations where it needs to be threaded to the external pipeline, which greatly improves the strength and torque resistance of the thread. Furthermore, the metal inserts 21 are connected to the corresponding branch pipes by injection molding instead of threaded connection, which avoids the risk of thread stripping failure when the metal connector 2 is connected to the plastic branch pipe thread. The installation and use requirements are met, and the reliability of the product is improved.

[0065] Example 6

[0066] This embodiment also provides a three-way valve, which has a basically the same structure as the three-way valve provided in Embodiment 1. The similarities will not be repeated here. The differences are as follows: Figure 8 As shown, both metal connectors 2 are union nuts 22. The union nuts 22 are connected to the outer periphery of the corresponding branch pipe through the retaining ring 3. A first limiting groove 111 is provided on the outer side wall of the branch pipe along its circumference, and a second limiting groove 221 is provided on the inner side wall of the union nut 22 along its circumference. The retaining ring 3 can be simultaneously limited within the first limiting groove 111 and the second limiting groove 221. Both union nuts 22 have internal threads, and each union nut 22 is connected to the corresponding external pipeline through its internal thread.

[0067] In this way, the three-way valve uses metal union nuts 22 at the locations where it needs to be threaded to external pipelines, which greatly improves the strength and torque resistance of the threads. Furthermore, the union nuts 22 are connected to the corresponding branch pipes via retaining rings 3 instead of threaded connections, which avoids the risk of thread stripping failure when the metal connector 2 is threaded to the plastic branch pipe. This meets the requirements for installation and use and improves the reliability of the product.

[0068] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A three-way valve characterized by, The valve body (1) is made of engineering plastic and comprises three branch pipes in communication with each other, the end of two of the branch pipes is provided with a metal joint (2) for threaded connection with an external pipeline, each of the metal joints (2) is connected to the end of the branch pipe by injection molding or a retaining ring (3), and the other branch pipe is provided with a ball valve assembly (4) for switching the fluid in the branch pipe.

2. The tee valve of claim 1, wherein One of the metal joints (2) is a metal insert (21) which is injection molded on the outer circumferential side or the inner circumferential side of the corresponding branch pipe, and the other metal joint (2) is a loose nut (22) which is connected to the outer circumferential side of the corresponding branch pipe by the retaining ring (3), a first limiting groove (111) is formed in the outer side wall of the branch pipe along the circumferential direction, a second limiting groove (221) is formed in the inner side wall of the loose nut (22) along the circumferential direction, and the retaining ring (3) can be simultaneously limited in the first limiting groove (111) and the second limiting groove (221).

3. The tee valve of claim 1, wherein Both of the metal joints (2) are metal inserts (21) which are injection molded on the outer circumferential side of the corresponding branch pipe. Alternatively, both of the metal inserts (21) are injection molded on the inner circumferential side of the corresponding branch pipe. Alternatively, one of the metal inserts (21) is injection molded on the outer circumferential side of the corresponding branch pipe, and the other metal insert (21) is injection molded on the inner circumferential side of the corresponding branch pipe.

4. The three-way valve according to claim 2 or 3, characterized in that The metal insert (21) is provided with an annular waterproof block (211) on the circumferential surface abutting against the branch pipe, and the branch pipe is provided with a waterproof groove (112) embedded with the waterproof block (211) on the circumferential surface abutting against the metal insert (21).

5. The three-way valve according to claim 4, characterized in that The number of the waterproof blocks (211) is multiple, and the waterproof blocks (211) are arranged in an axial direction of the metal insert (21), the number of the waterproof grooves (112) is multiple and corresponds to the waterproof blocks (211) one by one.

6. The tee valve of claim 4, wherein The cross section of the waterproof block (211) and the waterproof groove (112) is dovetail type.

7. The tee valve of claim 1, wherein Both of the metal joints (2) are loose nuts (22) which are connected to the outer circumferential side of the corresponding branch pipe by the retaining ring (3), a first limiting groove (111) is formed in the outer side wall of the branch pipe along the circumferential direction, a second limiting groove (221) is formed in the inner side wall of the loose nut (22) along the circumferential direction, and the retaining ring (3) can be simultaneously limited in the first limiting groove (111) and the second limiting groove (221).

8. The tee valve of claim 1, wherein The valve body (1) comprises a straight-through pipe (11) and a bypass pipe (12) which is in perpendicular communication with the straight-through pipe (11) to form three branch pipes, two ends of the straight-through pipe (11) are respectively connected with the metal joints (2), and the ball valve assembly (4) is arranged in the bypass pipe (12).

9. The three-way valve according to claim 8, characterized in that A reinforcing rib (113) is arranged on the outer wall of the straight-through pipe (11) between the two metal joints (2).

10. The tee valve of claim 8, wherein A valve cover (5) is further included, one end of the valve cover (5) is connected to the port of the bypass pipe (12) and blocks the ball valve assembly (4) in the bypass pipe (12), and a quick connector (6) for connecting external pipelines is arranged in the other end of the valve cover (5).

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