Quick-mounting stainless steel inner and outer thread water tap

Abstract

This utility model discloses a quick-install stainless steel internal and external threaded water fitting, including an internal threaded connector and an external threaded pipe fitting. The internal threaded connector is assembled at the front end of the external threaded pipe fitting, and a limit nut is installed at the connection between the internal threaded connector and the external threaded pipe fitting. An assembly sleeve is fitted around the external threaded pipe fitting, and the assembly sleeve is positioned outside the limit nut. Both ends of the assembly sleeve have receiving cavities, and a limit rod is installed inside the receiving cavity. Through its unique structural design, this quick-install stainless steel internal and external threaded water fitting allows the internal threaded connector to be quickly assembled at the front end of the external threaded pipe fitting, and the connection is initially positioned by the limit nut.

Description

Technical Field

[0001] This utility model relates to the technical field of internal and external threaded water seals, specifically a quick-install stainless steel internal and external threaded water seal. Background Technology

[0002] In modern industrial production and the construction of various buildings, pipeline systems serve as crucial carriers for transporting liquids, gases, and other media. The stability, sealing, and ease of installation of these systems are paramount. This is especially true in industries with extremely high requirements for hygiene and media transport safety, such as food, pharmaceuticals, and chemicals, as well as in water supply and drainage systems for civil buildings, where even more stringent standards apply to pipe fittings.

[0003] Traditional pipe connection methods, such as welding and ordinary threaded connections, have many drawbacks. While welding can achieve a relatively strong connection, it requires highly skilled workers and easily generates weld slag and other contaminants that may contaminate the medium being transported inside the pipeline. Furthermore, welded fittings are difficult to disassemble, hindering later maintenance and repair. Ordinary threaded connections, on the other hand, require a significant amount of time to tighten the threads during installation, resulting in low efficiency. Moreover, under complex operating conditions such as vibration and pressure fluctuations, they are prone to loosening, leading to seal failure and media leakage.

[0004] With the development of the industry, there is an urgent need for pipe connection fittings that can overcome the above-mentioned defects, and the quick-install stainless steel internal and external threaded water clamp has emerged. It aims to achieve fast and reliable pipe connections through innovative structural design, meeting the needs of various fields for efficient and safe operation of pipeline systems. Utility Model Content

[0005] The purpose of this invention is to provide a quick-install stainless steel internal and external threaded water seal to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a quick-install stainless steel internal and external threaded water fitting, comprising an internal threaded connector and an external threaded pipe fitting. The internal threaded connector is assembled at the front end of the external threaded pipe fitting, and a limit nut is installed at the connection between the internal threaded connector and the external threaded pipe fitting. An assembly sleeve is fitted around the external threaded pipe fitting, and the assembly sleeve is positioned outside the limit nut. Both ends of the assembly sleeve have receiving cavities, and a limit rod is installed inside the receiving cavity. An annular stepped groove is formed on the side wall of the limit nut, and the end of the limit rod is positioned within the annular stepped groove.

[0007] As a preferred embodiment of the quick-install stainless steel internal and external threaded water joint of this utility model, the inner wall of the limiting rod is provided with helical teeth, and the outer wall of the external threaded pipe fitting is provided with external threads, and the helical teeth mesh with the external threads.

[0008] As a preferred embodiment of the quick-installation stainless steel inner and outer wire water seal of this utility model, a limiting plate is installed inside the storage cavity, and a storage groove 14 is opened at the end of the limiting rod. A storage rod is inserted into the storage groove, and the storage rod is connected to the limiting plate.

[0009] As a preferred embodiment of the quick-installation stainless steel internal and external threaded water seal of this utility model, the outer wall of the assembly cylinder is provided with assembly threads.

[0010] As a preferred embodiment of the quick-install stainless steel internal and external threaded water joint of this utility model, the outer wall of the limiting nut is provided with a sealing gasket.

[0011] As a preferred embodiment of the quick-install stainless steel internal and external threaded water joint of this utility model, the inner wall of the internal threaded joint is provided with internal threads.

[0012] Compared with existing technologies, the advantages of this utility model are as follows: This quick-install stainless steel internal and external threaded water fitting, through its unique structural design, allows the internal threaded connector to be quickly assembled onto the front end of the external threaded pipe fitting, with the connection initially positioned by a limiting nut. The limiting rod on the outside of the assembly cylinder can mate with the annular stepped groove on the side wall of the limiting nut. During installation, simply fit the assembly cylinder onto the external threaded pipe fitting, rotate the assembly cylinder to engage the limiting rod with the annular stepped groove, and the connection is complete. No complex tools or cumbersome operating steps are required, greatly shortening installation time and improving work efficiency. Attached Figure Description

[0013] Figure 1 This is a front-view three-dimensional structural schematic diagram of the present invention;

[0014] Figure 2 This is a side view of the three-dimensional structure of the present invention;

[0015] Figure 3 This is a schematic diagram of the assembly cylinder of this utility model;

[0016] Figure 4 This is a schematic diagram of the limiting rod of this utility model.

[0017] In the diagram: 1. Internal threaded connector; 2. External threaded pipe fitting; 3. Limiting nut; 4. Assembly cylinder; 5. Internal thread; 6. External thread; 7. Annular stepped groove; 8. Sealing gasket; 9. Assembly thread; 10. Limiting rod; 11. Helical tooth; 12. Storage rod; 13. Limiting plate; 14. Storage groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] Please see Figure 1-4 This utility model provides a technical solution:

[0020] In this technical solution, the quick-install stainless steel internal and external threaded water fitting includes an internal threaded connector 1 and an external threaded pipe fitting 2. The internal threaded connector 1 is assembled at the front end of the external threaded pipe fitting 2, and a limit nut 3 is assembled at the connection between the internal threaded connector 1 and the external threaded pipe fitting 2. An assembly cylinder 4 is fitted on the outside of the external threaded pipe fitting 2, and the assembly cylinder 4 is set outside the limit nut 3. Both ends of the assembly cylinder 4 are provided with a receiving cavity, and a limit rod 10 is installed inside the receiving cavity. An annular stepped groove 7 is provided on the side wall of the limit nut 3, and the end of the limit rod 10 is set in the annular stepped groove 7.

[0021] The assembly of the internal threaded connector 1 and the external threaded pipe fitting 2 adopts a "front-end embedded fit" structure. The inner wall of the rear end of the internal threaded connector 1 needs to form a transition fit with the outer wall of the front end of the external threaded pipe fitting 2. The fit clearance is controlled within 0.02-0.05mm to ensure the coaxiality of the initial assembly and avoid eccentricity during subsequent connection, which could lead to sealing failure. The limiting nut 3 adopts a "double-end face positioning" design. One end face of the nut fits against the rear end face of the internal threaded connector 1, and the other end face forms a limiting contact with the front end face of the assembly cylinder 4. Axial positioning restricts the axial movement of the internal threaded connector 1 and the external threaded pipe fitting 2.

[0022] The assembly cylinder 4 and the externally threaded pipe fitting 2 are clearance-fitted. The clearance between the inner wall of the assembly cylinder 4 and the outer wall of the externally threaded pipe fitting 2 must be maintained at 0.1-0.15mm. This ensures that the assembly cylinder 4 can rotate flexibly while preventing excessive radial wobble from affecting the fitting accuracy of the limiting rod 10 and the annular stepped groove 7. Receiving cavities are symmetrically distributed on both sides of the end of the assembly cylinder 4. The axis of the receiving cavity is parallel to the radial direction of the assembly cylinder 4, ensuring that the limiting rod 10 can stably extend and retract radially. The limiting rod 10 adopts a "stepped shaft" structure. The end diameter must match the groove width of the annular stepped groove 7, and the end must be rounded (rounded radius R0.5-R1) to reduce frictional loss when mating with the annular stepped groove 7 and extend its service life.

[0023] The annular stepped groove 7 is opened in the middle of the side wall of the limiting nut 3. The groove has a "U" shaped structure and the groove depth is divided into two levels. The first level groove depth (near the outer wall of the limiting nut 3) is 2-3mm, and the second level groove depth (near the inner wall of the limiting nut 3) is 1.5-2mm. The stepped surface fits against the end step surface of the limiting rod 10 to achieve bidirectional limiting and prevent the limiting rod 10 from coming out of the groove.

[0024] The helical teeth 11 and the external thread 6 adopt an involute meshing design. The tooth profile parameters of the helical teeth 11 must match the thread parameters of the external thread 6 to ensure smooth transmission and no jamming during meshing. The helical teeth 11 are axially distributed along the inner wall of the limiting rod 10, and the tooth surface needs to be subjected to high-frequency quenching treatment (quenching hardness HRC50-55) to improve the wear resistance of the tooth surface and avoid tooth wear caused by long-term meshing. The external thread 6 adopts a fine-pitch thread structure. Compared with coarse-pitch threads, fine-pitch threads have a smaller pitch, which can reduce the impact force during meshing, improve connection stability, and enhance sealing performance.

[0025] During meshing, a gap of 0.1-0.15mm must be maintained between the tip of the helical tooth 11 and the root of the external thread 6 to prevent direct contact between the tip and root due to machining errors, which could damage the tooth profile. In addition, the number of teeth on the helical tooth 11 needs to be determined according to the length of the limit rod 10, usually 3-5 teeth, to ensure the contact area during meshing and avoid excessive local stress.

[0026] In some technical solutions, the inner wall of the limiting rod 10 is provided with helical teeth 11, and the outer wall of the external threaded pipe fitting 2 is provided with external threads 6, and the helical teeth 11 mesh with the external threads 6.

[0027] In some technical solutions, a limiting plate 13 is installed inside the storage cavity, and a storage groove 14 is opened at the end of the limiting rod 10. A storage rod 12 is inserted into the storage groove 14, and the storage rod 12 is connected to the limiting plate 13.

[0028] The limiting plate 13 adopts a "circular flat plate" structure and is interference-fitted with the inner wall of the storage cavity (interference amount 0.01-0.03mm) to ensure that the limiting plate 13 is firmly fixed in the storage cavity and does not shift. One end of the storage rod 12 is welded to the limiting plate 13 (welding method is argon arc welding, welding height 3-5mm), and the other end is inserted into the storage groove 14, forming a clearance fit with the storage groove 14 (fit clearance 0.05-0.08mm), ensuring that the storage rod 12 can flexibly extend and retract within the storage groove 14, while restricting the radial movement of the limiting rod 10.

[0029] The storage groove 14 is located at the center of the end of the limiting rod 10. The groove depth is 2-3 mm longer than the length of the storage rod 12 to allow for the extension and retraction of the limiting rod 10. In addition, the outer wall of the storage rod 12 needs to be chrome-plated (chrome plating thickness 0.02-0.05 mm) to improve surface hardness and wear resistance and reduce frictional loss with the storage groove 14. The surface roughness of the inner wall of the storage groove 14 needs to be controlled at Ra≤0.8μm to reduce frictional resistance.

[0030] In some technical solutions, the outer wall of the assembly cylinder 4 is provided with assembly threads 9.

[0031] The assembly thread 9 adopts a coarse thread structure and is located in the middle of the outer wall of the assembly cylinder 4. The thread direction is consistent with that of the external thread 6 (both are right-handed). This ensures that when the assembly cylinder 4 is rotated for connection, the engagement direction of the assembly thread 9 with the external pipe fitting is coordinated with the engagement direction of the limit rod 10, avoiding reverse force that could cause the connection to loosen. The effective thread length of the assembly thread 9 must cover 2 / 3 of the length of the outer wall of the assembly cylinder 4 to ensure the engagement depth with the external pipe fitting and improve connection stability.

[0032] In addition, the crest of thread 9 needs to be rounded (rounding radius R0.2-R0.3mm) to reduce bumps and damage during assembly; the thread surface needs to be phosphated (phosphating film thickness 5-8μm) to improve surface adhesion, facilitate subsequent application of anti-rust grease, and enhance corrosion resistance.

[0033] In some technical solutions, a sealing gasket 8 is provided on the outer wall of the limit nut 3.

[0034] The sealing gasket 8 adopts a "ring structure" and is fitted into the middle of the outer wall of the limiting nut 3. It has an interference fit with the outer wall of the limiting nut 3 (interference amount 0.1-0.2mm) to ensure that the sealing gasket 8 is firmly fixed and does not shift. One side of the sealing gasket 8 is in contact with the rear end face of the internal threaded connector 1, and the other side is in contact with the front end face of the assembly cylinder 4. Compression sealing is achieved by axial pressure during assembly. The compression amount needs to be controlled within 20%-30% of the thickness of the sealing gasket 8 to ensure sealing performance while avoiding excessive compression that could damage the sealing gasket 8.

[0035] The material of the sealing gasket 8 must be selected according to the medium used. When used in the drinking water and food industries, food-grade silicone (compliant with GB4806.10-2024 standard) is used; when used in chemical and high-temperature environments, fluororubber (temperature range -20℃ to 200℃, resistant to acid and alkali corrosion) is used. In addition, the inner wall of the sealing gasket 8 needs to be roughened (surface roughness Ra2.5-R3.2μm) to enhance the friction with the outer wall of the limiting nut 3 and prevent the sealing gasket 8 from sliding.

[0036] In some technical solutions, the inner wall of the internal threaded connector 1 is provided with an internal thread 5.

[0037] The internal thread 5 adopts either a tapered pipe thread or a cylindrical pipe thread structure, depending on the application scenario: When used for high-pressure pipelines (such as steam pipelines, pressure ≥ 1.6 MPa), a tapered pipe thread (such as Rc thread, conforming to GB / T7306.2-2000 standard) is used, and the seal is achieved through the taper of the thread itself; when used for low-pressure pipelines (such as drinking water pipelines, pressure ≤ 1.0 MPa), a cylindrical pipe thread (such as G thread, conforming to GB / T7307-2001 standard) is used, and it needs to be used in conjunction with thread sealing tape or sealant.

[0038] The effective thread length of internal thread 5 must cover 3 / 4 of the inner wall length of internal thread connector 1 to ensure the engagement depth with external pipe fittings and improve connection stability. The thread root must be rounded (radius R0.1-R0.2mm) to reduce stress concentration and prevent thread breakage after long-term use. Furthermore, the surface of internal thread 5 must undergo rust-proofing treatment (such as passivation, with a passivation film thickness of 5-10μm) to enhance corrosion resistance.

[0039] I. Overall Working Process (Taking a complete technical solution as an example, including spiral teeth, limiting plate, and sealing gasket structure)

[0040] Phase 1: Initial Assembly (Component Pre-positioning)

[0041] Connecting internal threaded connectors with external threaded pipe fittings: Slide the inner wall of the rear end of the internal threaded connector 1 (transition fit section) onto the outer wall of the front end of the external threaded pipe fitting 2, control the fit clearance to 0.02-0.05mm, and ensure that the axes of the two are coaxial (deviation ≤0.03mm). At this time, the rear end face of the internal threaded connector 1 is flush with the front end face of the external threaded pipe fitting 2.

[0042] Installation of the limiting nut: Insert the limiting nut 3 into the rear end of the external threaded pipe fitting 2 and push it forward until it fits against the rear end face of the internal threaded connector 1. Through the "double end face positioning" function of the limiting nut 3, the axial movement of the internal threaded connector 1 and the external threaded pipe fitting 2 is initially restricted (movement amount ≤ 0.05mm).

[0043] Pre-installation of the assembly cylinder and the limiting rod: Connect one end of the receiving rod 12 to the limiting plate 13 by argon arc welding (welding height 3-5mm), and insert the other end into the receiving groove 14 of the limiting rod 10 (fitting clearance 0.05-0.08mm). Then press the limiting plate 13 into the receiving cavity of the assembly cylinder 4 (interference 0.01-0.03mm) to form the "limiting rod-receiving rod-limiting plate" assembly. Subsequently, insert the assembly cylinder 4 from the rear end of the external threaded pipe fitting 2, so that the front end of the assembly cylinder 4 is close to the outer wall of the limiting nut 3 (radial clearance 0.5-1mm).

[0044] Phase 2: Quick Lock-in (Core Connectivity Steps)

[0045] Assembly cylinder rotation drive: Rotate the assembly cylinder 4 clockwise (rotational resistance ≤ 5 N·m). Since the inner wall of the assembly cylinder 4 and the outer wall of the external threaded pipe 2 are in clearance fit (0.1-0.15 mm), the assembly cylinder 4 can rotate stably around the external threaded pipe 2. At this time, the helical teeth 11 on the inner wall of the limit rod 10 begin to mesh with the external thread 6 (pitch 1.5-3 mm) on the outer wall of the external threaded pipe 2.

[0046] Radial extension and retraction of the limiting rod and locking of the stepped groove: As the assembly cylinder 4 rotates, the helical teeth 11 move along the tooth profile of the external thread 6, causing the limiting rod 10 to retract radially inward along the receiving cavity (the receiving rod 12 extends and retracts synchronously in the receiving groove 14, leaving a 2-3mm extension and retraction space); when the end of the limiting rod 10 (rounded corner R0.5-R1) contacts the side wall of the limiting nut 3, the assembly cylinder 4 continues to rotate until the end of the limiting rod 10 is completely inserted into the annular stepped groove 7 - the first-level groove (2-3mm deep) accommodates the stepped end of the limiting rod 10, and the second-level groove (1.5-2mm deep) restricts its excessive extension, realizing bidirectional limiting. At this time, the meshing depth of the helical teeth 11 and the external thread 6 reaches 3-5 teeth, completing the connection locking.

[0047] Phase 3: Sealing Enhancement and External Adaptation

[0048] Sealing gasket compression sealing: During the rotation and locking process of the assembly cylinder 4, its front end face gradually squeezes the sealing gasket 8 (thickness 3-5mm) on the outer wall of the limiting nut 3, so that the sealing gasket 8 generates a compression of 20%-30% (such as a 3mm thick sealing gasket compressed by 0.6-0.9mm). The two sides of the sealing gasket 8 are tightly fitted with the rear end face of the internal threaded connector 1 and the front end face of the assembly cylinder 4 respectively, filling the gap to achieve sealing.

[0049] External pipe fitting connection: Connect the water joint to the external pipe or equipment through the assembly thread 9 (nominal diameter 18-60mm, pitch 2-4mm) on the outer wall of the assembly cylinder 4, and tighten it until the thread connection strength is ≥20N・m. At this time, the internal thread 5 (Rc / G type) on the inner wall of the internal thread connector 1 can be further connected to the front end pipe to form a complete medium channel.

[0050] Phase 4: Maintenance and Disassembly

[0051] When maintenance is required, rotate the assembly cylinder 4 counterclockwise, and the helical teeth 11 engage in the opposite direction along the external thread 6, causing the limit rod 10 to extend radially outward and disengage from the annular stepped groove 7; then pull the assembly cylinder 4 backward to remove the limit nut 3, and the internal threaded joint 1 and the external threaded pipe fitting 2 can be separated. The entire disassembly process does not require special tools and the time taken is reduced by more than 60% compared with traditional welding / ordinary threaded connections.

[0052] II. Analysis of Core Working Principles

[0053] 1. Rapid assembly principle: radial limiting driven by helical meshing.

[0054] Power transmission path: Assembly cylinder rotates → helical teeth (module 1-2mm) mesh with external thread → limit rod extends and retracts radially, replacing the cumbersome steps of traditional "bolt tightening + tool fixing", and achieving "rotation lock" through mechanical transmission of thread meshing, improving installation efficiency by 3-5 times.

[0055] Precision assurance mechanism: The clearance fit (0.05-0.08mm) between the storage rod and the storage slot limits the radial movement of the limiting rod (≤0.03mm), ensuring that the end of the limiting rod can be accurately engaged in the annular stepped groove 7 (groove wall roughness Ra≤3.2μm), avoiding locking failure due to offset.

[0056] 2. Connection Stability Principle: Bidirectional Constraints Based on Multi-Structure Collaboration

[0057] Axial constraint: The double-end face contact of the limiting nut 3 (with the internal threaded connector 1 and the assembly sleeve 4) + the compression reaction force of the sealing gasket 8 together restrict the axial displacement of the internal threaded connector 1 and the external threaded pipe fitting 2. The torque resistance is ≥15N・m, and the thread loosening amount is ≤0.1mm after 1000 vibration tests (amplitude 0.5mm, 50Hz).

[0058] Radial constraint: The clearance fit (0.1-0.15mm) between the assembly cylinder 4 and the external threaded pipe fitting 2, plus the fit between the limit rod 10 and the annular stepped groove 7 (the contact area of ​​the stepped surface is ≥80%), prevents the component from wobbling radially. Under a water pressure of 1.8MPa, the radial deformation of the assembly cylinder 4 is ≤0.2mm, ensuring connection stability.

[0059] 3. Sealing principle: Combination of elastic compression and structural adaptation

[0060] Elastic seal: The sealing gasket 8 (food-grade silicone / fluororubber) undergoes elastic deformation through 20%-30% compression, filling the micro gap (≤0.05mm) between the internal threaded joint 1, the limit nut 3, and the assembly cylinder 4. It can withstand water pressure ≥1.6MPa at room temperature and has no leakage for 30 minutes.

[0061] Auxiliary sealing: The fine tooth structure of the external thread 6 (tooth angle 60°) reduces the medium penetration channel. Combined with the meshing gap (0.1-0.15mm) between the helical teeth 11 and the external thread 6, it forms a double protection of "threaded seal + elastic seal", which is suitable for drinking water, steam and weakly corrosive media scenarios.

[0062] 4. Adaptability Principle: Modular Structure and Standardized Design

[0063] Specifications Compatibility: With a size gradient of nominal diameter DN15-DN50 (e.g., internal thread connector length 25-50mm, assembly sleeve length 35-65mm), it meets the connection requirements of pipes with different diameters; the standardized parameters of assembly thread 9 (6h accuracy level) can be adapted to most pipe fittings / equipment with internal threads on the market.

[0064] Scenario adaptability: The internal thread 5 can be selected as Rc tapered pipe thread (high pressure above 1.6MPa) or G cylindrical pipe thread (low pressure below 1.0MPa), and the sealing gasket 8 can be selected as silicone (food grade) or fluororubber (high temperature / chemical) depending on the medium, so as to realize the application of "one structure for multiple scenarios".

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A quick-install stainless steel internal and external threaded water fitting, comprising an internal threaded connector (1) and an external threaded fitting (2), characterized in that, The internal threaded connector (1) is assembled at the front end of the external threaded pipe fitting (2), and a limit nut (3) is assembled at the connection between the internal threaded connector (1) and the external threaded pipe fitting (2). The external threaded pipe fitting (2) is fitted with an assembly sleeve (4), which is located outside the limiting nut (3); The assembly cylinder (4) has a storage cavity at both ends, and a limit rod (10) is installed inside the storage cavity. The side wall of the limiting nut (3) is provided with an annular stepped groove (7), and the end of the limiting rod (10) is set in the annular stepped groove (7).

2. The quick-mounting stainless steel female-female water tap according to claim 1, characterized in that, The inner walls of the two limiting rods (10) are provided with helical teeth (11), and the outer wall of the external threaded pipe fitting (2) is provided with external threads (6). The helical teeth (11) mesh with the external threads (6).

3. The quick-mounting stainless steel female-female water tap according to claim 2, characterized in that, The storage cavity is equipped with a limiting plate (13), and the end of the limiting rod (10) is provided with a storage groove 14. A storage rod (12) is inserted into the storage groove (14), and the storage rod (12) is connected to the limiting plate (13).

4. The quick-mounting stainless steel female-female water tap according to claim 1, characterized in that, The outer wall of the assembly cylinder (4) is provided with assembly threads (9).

5. The quick-mounting stainless steel female-female water tap according to claim 1, characterized in that, The outer wall of the limiting nut (3) is provided with a sealing gasket (8).

6. The quick-mounting stainless steel female-female water tap according to claim 1, characterized in that, The inner wall of the internal threaded connector (1) is provided with an internal thread (5).

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