Self-locking butt joint ball valve

Abstract

The utility model relates to the technical field of valve joints, in particular to a self-locking butt-joint ball valve, which comprises a valve body, a valve core, a ball joint and a ball joint, the valve element is rotationally installed in the flow channel, and a through hole is formed in the valve element; the knob is rotationally mounted on the valve body, is connected with the valve core, and is used for driving the valve core to rotate so as to switch the opening and closing of the flow channel; a butt-joint structure is arranged at one axial end of each valve body and is used for locking the pair of valve bodies and communicating the pair of runners so as to realize butt joint of the pair of ball valves; a self-locking device is arranged on the valve body and comprises a first pin body and a first elastic piece, the first pin body is movably installed on the valve body, a contact is arranged at one end of the first pin body, and a self-locking component is arranged between the first pin body and the rotary knob. The use safety is improved, and the use convenience is high.

Description

Technical Field

[0001] This utility model relates to the field of valve joint technology, specifically to a self-locking docking ball valve. Background Technology

[0002] With the rapid development of the liquid cooling industry, the variety of quick couplings has increased rapidly to improve the efficiency of liquid cooling equipment connections. Matching quick couplings can be found for different liquid cooling equipment to ensure its normal operation. Disconnecting the coupling often requires cutting off the pipeline. Existing couplings often integrate valve switches, but there is no guarantee against accidental switch activation leading to liquid leakage when closing. Utility Model Content

[0003] To overcome the shortcomings of the prior art, this utility model provides a self-locking docking ball valve, which increases the safety of use and has the advantages of high ease of use.

[0004] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0005] A self-locking docking ball valve, comprising:

[0006] The valve body has an axially through flow channel.

[0007] The valve core is rotatably installed in the flow channel, and the valve core is provided with a through hole;

[0008] A knob is mounted on the valve body and connected to the valve core. The knob is used to rotate the valve core to switch the opening and closing of the flow channel.

[0009] The valve body has a connecting structure at one axial end. The connecting structure is used to lock a pair of valve bodies and connect a pair of flow channels to realize the docking of a pair of ball valves.

[0010] The valve body is provided with a self-locking device, which includes a first pin and a first elastic element. The first pin is movably mounted on the valve body, and one end of the first pin is provided with a contact. A self-locking component is provided between the first pin and the knob.

[0011] When the ball valve is not connected and the flow channel is at least in the closed state, the first elastic element and the first pin axially abut against each other to elastically push the contact out of the valve body near the docking structure. At this time, the self-locking component is coupled and the knob cannot move.

[0012] When a pair of ball valves are connected, the contacts on both sides abut axially to drive the first pin to move axially a preset distance. At this time, the self-locking component is decoupled, and the knob can move.

[0013] Furthermore, a self-locking docking ball valve in this application includes a locking groove and a locking plate extending in an arc. One side of the locking groove has an insertion groove adapted to the locking plate, and the insertion groove is located on one side of the circumferential extension direction of the locking groove. A pair of ball valves axially enter the insertion groove on the other side through the locking plate on one side, and then rotate circumferentially until the locking plate enters the locking groove to achieve docking. As a preferred embodiment of this application, it has the advantages of simple connection and easy disassembly.

[0014] Furthermore, a self-locking docking ball valve in this application also includes a limiting surface, which is disposed at the end of the locking groove circumferentially away from the insertion groove. The limiting surface is used to restrict the locking plate entering the locking groove from rotating to abutting against the limiting surface, so that the contacts on both sides abut against each other. As a preferred embodiment of this application, the limiting surface is used to achieve circumferential positioning of the ball valve after docking.

[0015] Furthermore, in this application, a self-locking docking ball valve includes a locking cavity located on a knob and a locking protrusion located on a first pin. When the self-locking component is coupled, the locking protrusion enters the locking cavity, and when the self-locking component is decoupled, the locking protrusion moves out of the locking cavity. The number of locking cavities is 2, and when the knob is rotated to the open or closed state of the flow channel, a pair of locking cavities are respectively opposite to the locking protrusion.

[0016] Furthermore, in a self-locking docking ball valve of this application, the locking cavity is located on the end face of the knob near the valve body. The knob has a movable cavity radially inner to the locking cavity. When the self-locking component is decoupled, the movable cavity is used to accommodate the locking protrusion. When the knob is rotated, the movable cavity allows space for the relative movement of the locking protrusion.

[0017] Furthermore, in a self-locking docking ball valve of this application, a limiting seat is provided on the valve body, a first pin is slidably mounted on the limiting seat, the limiting seat is provided with a receiving groove for receiving the first pin, one end of a first elastic member abuts against the first pin, and the other end abuts against the receiving groove, and an annular limiting cap is installed at the opening end of the receiving groove away from the knob. When the self-locking component is decoupled, the annular limiting cap is used to restrict the first pin from axially moving out of the receiving groove, and the contact extends out from the inner hole of the annular limiting cap.

[0018] The first pin has an extension rod at the end away from the contact. The extension rod extends out from the receiving groove in the direction away from the contact. A locking protrusion is provided at the end of the extension rod away from the contact. There is a gap between the knob and the valve body to receive the extension rod.

[0019] Furthermore, in this application, a self-locking ball valve is provided with symmetrically arranged locking protrusions and locking holes at one end of the valve body near the connecting structure. A cam drive surface is provided on the knob. A second pin is slidably provided on the valve body. The locking protrusion is provided at one axial end of the second pin. The second pin elastically abuts against the cam drive surface away from the locking protrusion. The knob can drive the second pin to move through the cam drive surface during rotation.

[0020] After a pair of ball valves are connected, when the knob is turned to the open position, the locking protrusions on both sides engage with each other in the locking holes on the opposite sides to restrict the circumferential rotation of the pair of ball valves. When the knob is turned to the closed position, the locking protrusions on both sides move out of the locking holes, at which point the pair of ball valves can be rotated and disassembled. As a preferred embodiment of this application, the connected ball valves can only be separated when the flow channels on both sides are closed after the ball valves are connected, preventing accidental liquid leakage caused by directly separating the ball valves to close the flow channels.

[0021] Furthermore, in a self-locking docking ball valve of this application, a limiting bead is provided between the knob and the valve body. The knob near the valve body is provided with a movable groove for receiving the limiting bead. The valve body near the knob is provided with at least one limiting groove that is adapted to the limiting bead. When the knob is rotated to open the flow channel, the limiting bead is directly opposite a limiting groove.

[0022] It also includes an adjusting rod, which is axially movably mounted on the knob. The adjusting rod is located at the end of the limiting bead away from the valve body. The adjusting rod is provided with a limiting convex surface. When the limiting convex surface abuts against the limiting bead, the end of the limiting bead away from the limiting convex surface is squeezed out of the movable groove and thus limited in the limiting groove, so as to lock the knob in the preset position.

[0023] When the movable adjusting rod moves to the point where the limiting convex surface is axially separated from the limiting bead, the limiting bead can move away from the valve body in the movable groove until it moves out of the limiting groove, at which point the knob can be rotated.

[0024] Furthermore, in a self-locking docking ball valve of this application, one end of the adjusting rod extends outward from the outside of the knob to form a button, and also includes a third elastic element that axially abuts against the adjusting rod;

[0025] In the reset state, the adjusting rod is moved by the elastic force of the third elastic element until the limiting convex surface abuts against the limiting bead;

[0026] Pressing the button moves the adjusting lever until the limiting protrusion is axially separated from the limiting bead. This prevents the knob from being accidentally turned.

[0027] Furthermore, in a self-locking docking ball valve of this application, a connecting post is connected between the knob and the valve core. The connecting post radially penetrates the side wall of the valve body and is rotatably connected to the valve body. A sealing ring is provided between the connecting post and the valve body. A limiting cover is provided on the side wall of the valve body. The limiting cover has a through hole. A limiting step is provided on the connecting post that axially abuts against the inner side of the limiting cover. The connecting post extends axially out of the through hole and connects to the knob.

[0028] As can be seen from the above technical solution, this utility model has the following beneficial effects:

[0029] 1. This utility model provides a self-locking docking ball valve. The method of use is as follows: connect the end of the valve body away from the docking structure to the end of the pipe body. When a pair of ball valves are not docked, if the contact is not actively pressed to decouple the self-locking component, the knob can be limited to the closed state of the flow channel to prevent the knob from being accidentally opened and causing leakage when the ball valve is used alone. After a pair of ball valves are docked, the self-locking component is decoupled, and the knob can move to switch the state of the flow channel to realize the opening and closing of the flow channels on both sides. Therefore, the safety of use is increased, and the docking state of the ball valve switches the coupling state of the self-locking component, which has the advantage of high ease of use. Attached Figure Description

[0030] Figure 1 This is a three-dimensional structural schematic diagram of a self-locking docking ball valve according to an embodiment of this application;

[0031] Figure 2 This is a plan view of a self-locking docking ball valve according to an embodiment of this application;

[0032] Figure 3 This is a front plan view of a self-locking docking ball valve according to an embodiment of this application;

[0033] Figure 4 for Figure 2 A cross-sectional view along the AA direction;

[0034] Figure 5 for Figure 4 A magnified view of a portion of area A in the center circle;

[0035] Figure 6 for Figure 3 Cross-sectional view along the BB direction;

[0036] Figure 7 for Figure 3 A cross-sectional view along the CC direction;

[0037] Figure 8 This is an exploded view of a component of a self-locking docking ball valve according to an embodiment of this application.

[0038] Figure 9 This is a schematic diagram of the knob in the embodiment of this application.

[0039] In the diagram: 1-valve body; 10-flow channel; 121-lock groove; 122-locking plate; 123-insertion groove; 124-limiting surface; 13-limiting seat; 130-receiving groove; 131-annular limit cap; 14-locking hole; 15-limiting groove;

[0040] 2-Valve core; 20-Through hole;

[0041] 3-Knob; 31-Locking cavity; 32-Moving cavity; 33-Cam drive surface; 34-Moving groove; 35-Adjusting rod; 351-Limiting convex surface; 352-Button; 36-Third elastic element;

[0042] 4-Self-locking device; 41-First pin; 411-Contact; 412-Locking protrusion; 413-Extension rod; 42-First elastic element;

[0043] 51-Second pin; 511-Locking protrusion; 53-Second spring;

[0044] 6-Limiting beads;

[0045] 7-Connecting post; 71-Sealing ring; 72-Limiting step;

[0046] 8-Limiting cover; 80-Perforation. Detailed Implementation

[0047] This embodiment provides a combination Figures 1 to 4 The self-locking docking ball valve shown includes a valve body 1, on which an axially through flow channel 10 is provided;

[0048] Valve core 2 is rotatably installed in flow channel 10, and valve core 2 is provided with through hole 20;

[0049] Knob 3 is rotatably mounted on valve body 1. Knob 3 is connected to valve core 2. Knob 3 is used to drive valve core 2 to rotate to switch the opening and closing of flow channel 10.

[0050] One axial end of the valve body 1 is provided with a connecting structure, which is used to lock a pair of valve bodies 1 and connect a pair of flow channels 10 to realize the docking of a pair of ball valves.

[0051] The valve body 1 is provided with a self-locking device 4, wherein the self-locking device 4 includes a first pin 41 and a first elastic element 42. The first pin 41 is movably installed on the valve body 1. One end of the first pin 41 is provided with a contact 411. A self-locking component is provided between the first pin 41 and the knob 3.

[0052] When the ball valve is not docked and the flow channel 10 is at least in the closed state, the first elastic member 42 and the first pin 41 axially abut against each other to elastically push the contact 411 out of the valve body 1 near the docking structure. At this time, the self-locking member is coupled and the knob 3 cannot move.

[0053] When a pair of ball valves are connected, the contacts 411 on both sides abut axially to drive the first pin 41 to move axially a preset distance. At this time, the self-locking component is decoupled, and the knob 3 can move.

[0054] Based on the above device, the method of using a self-locking docking ball valve in this embodiment is as follows: The valve body 1 is connected to the end of the pipe body away from the docking structure. When a pair of ball valves are not docked, if the contact is not actively pressed to decouple the self-locking component, the knob 3 can be limited to the closed state of the flow channel 10 to prevent accidental opening of the knob 3 when the ball valve is used alone, leading to leakage. After a pair of ball valves are docked, the self-locking component is decoupled, and the knob 3 can move to switch the state of the flow channel 10 to achieve the opening and closing of the flow channels on both sides. Therefore, the safety of use is increased, and the docking state of the ball valve switches the coupling state of the self-locking component, which has the advantage of high ease of use. The through hole 20 is used to connect the flow channels 10 on both sides of the valve core 2 when the knob 3 is switched to the open state of the flow channel 10.

[0055] Combination Figure 1 and Figure 4 As shown, further in this embodiment, the connecting structure includes an arc-extending locking groove 121 and a locking plate 122. One side of the locking groove 121 has an insertion groove 123 adapted to the locking plate 122. The insertion groove 123 is located on one side of the locking groove 121 in the circumferential extension direction. A pair of ball valves enter axially into the insertion groove 123 on the other side through the locking plate 122 on one side, and then rotate circumferentially until the locking plate 122 enters the locking groove 121 to achieve docking. This has the advantages of simple connection and easy disassembly. In this embodiment, a limiting surface 124 is also included. The limiting surface 124 is located at the end of the locking groove 121 circumferentially away from the insertion groove 123. The limiting surface 124 is used to restrict the locking plate 122 entering the locking groove 121 from rotating until it abuts against the limiting surface 124, at which point the contacts 411 on both sides abut against each other. The limiting surface 124 is used to achieve circumferential positioning of the ball valves after docking.

[0056] Combination Figure 4 , Figure 5 and Figure 9 As shown, further, in this embodiment, the self-locking component includes a locking cavity 31 located on the knob 3 and a locking protrusion 412 located on the first pin 41. When the self-locking component is coupled, the locking protrusion 412 enters the locking cavity 31; when the self-locking component is decoupled, the locking protrusion 412 moves out of the locking cavity 31. There are two locking cavities 31. When the knob 3 is rotated to the open or closed state of the flow channel 10, a pair of locking cavities 31 are respectively opposite to the locking protrusion 412. In this embodiment, the locking cavity 31 is provided on the end face of the knob 3 near the valve body 1. A movable cavity 32 is provided on the knob 3 on the radially inner side of the locking cavity 31. When the self-locking component is decoupled, the movable cavity 32 is used to receive the locking protrusion 412. When the knob 3 is rotated, the movable cavity 32 is used to allow space for the relative movement of the locking protrusion 412.

[0057] Furthermore, in this embodiment, the valve body 1 is provided with a limiting seat 13, the first pin 41 is slidably mounted on the limiting seat 13, the limiting seat 13 is provided with a receiving groove 130 for receiving the first pin 41, one end of the first elastic member 42 abuts against the first pin 41, and the other end abuts against the receiving groove 130. An annular limiting cap 131 is installed at the opening end of the receiving groove 130 away from the knob 3. When the self-locking component is decoupled, the annular limiting cap 131 is used to restrict the first pin 41 from axially moving out of the receiving groove 130, and the contact 411 extends out from the inner hole of the annular limiting cap 131.

[0058] The first pin 41 has an extension rod 413 at the end away from the contact 411. The extension rod 413 extends out from the receiving groove 130 in the direction away from the contact 411. The locking protrusion 412 is provided at the end of the extension rod 413 away from the contact 411. There is a gap between the knob 3 and the valve body 1 to receive the extension rod 413.

[0059] Combination Figure 1 , Figure 3 and Figure 6 As shown, further, in this embodiment, the valve body 1 is provided with a symmetrically arranged locking protrusion 511 and locking hole 14 near one end of the connecting structure, the knob 3 is provided with a cam transmission surface 33, the valve body 1 is slidably provided with a second pin 51, the locking protrusion 511 is provided at one axial end of the second pin 51, the second pin 51 elastically abuts against the cam transmission surface 33 away from the locking protrusion 511, and the knob 3 can drive the second pin 51 to move through the cam transmission surface 33 during rotation;

[0060] After a pair of ball valves are connected, when the knob 3 is turned to the open state of the flow channel 10, the locking protrusions 511 on both sides enter the locking holes 14 on the opposite side to restrict the circumferential rotation of the pair of ball valves; when the knob 3 is turned to the closed state of the flow channel 10, the locking protrusions 511 on both sides move out of the locking holes 14, at which point the pair of ball valves can be rotated and disassembled.

[0061] Therefore, the ball valve can only be separated after it has been connected, provided that the flow channels 10 on both sides are closed. This prevents accidental leakage of liquid caused by directly separating the ball valve before closing the flow channels 10. Specifically, the second pin 51 and the locking hole 14 are provided on the limit seat 13, and the second pin 51 elastically abuts against the cam drive surface 33 via the second spring 53.

[0062] Combination Figure 2 , Figures 7 to 9 As shown, further, in this embodiment, a limiting bead 6 is provided between the knob 3 and the valve body 1. The knob 3 is provided with a movable groove 34 for receiving the limiting bead 6 at one end near the valve body 1. At least one limiting groove 15 adapted to the limiting bead 6 is provided on the valve body 1 at one end near the knob 3. When the knob 3 is rotated to the point where the flow channel 10 is open, the limiting bead 6 is directly opposite to a limiting groove 15.

[0063] It also includes an adjusting rod 35, which is axially movably mounted on the knob 3. The adjusting rod 35 is located at the end of the limiting bead 6 away from the valve body 1. The adjusting rod 35 is provided with a limiting convex surface 351. When the limiting convex surface 351 abuts against the limiting bead 6, the end of the limiting bead 6 away from the limiting convex surface 351 is squeezed out of the movable groove 34 and thus limited in the limiting groove 15, so as to lock the knob 3 in the preset position.

[0064] When the movable adjusting rod 35 is axially separated from the limiting protrusion 351 and the limiting bead 6, the limiting bead 6 can move away from the valve body 1 in the movable groove 34 and even move out of the limiting groove 15. At this time, the knob 3 can be rotated.

[0065] Specifically, there are two limiting grooves 15. When the knob 3 is turned to the flow channel 10 closed, the limiting bead 6 is directly opposite another limiting groove 15.

[0066] Specifically, in this embodiment, one end of the adjusting rod 35 extends out of the outer side of the knob 3 to form a button 352, and also includes a third elastic member 36 that axially abuts against the adjusting rod 35;

[0067] In the reset state, the adjusting rod 35 is moved by the elastic force of the third elastic element 36 to the limiting convex surface 351 and the limiting bead 6.

[0068] Pressing button 352 allows the adjusting rod 35 to move until the limiting convex surface 351 is axially separated from the limiting bead 6.

[0069] This prevents the knob 3 from being accidentally turned. In this embodiment, the first elastic element 42, the second spring 53, and the third elastic element 36 are all compression springs.

[0070] Combination Figure 4 and Figure 8 As shown, in this embodiment, a connecting post 7 connects the knob 3 and the valve core 2. The connecting post 7 radially penetrates the side wall of the valve body 1 and is rotatably connected to the valve body 1. A sealing ring 71 is provided between the connecting post 7 and the valve body 1. A limiting cover 8 is provided on the side wall of the valve body 1, and a through hole 80 is provided on the limiting cover 8. A limiting step 72 is provided on the connecting post 7 that axially abuts against the inner side of the limiting cover 8. The connecting post 7 extends axially out of the through hole 80 and connects to the knob 3. Specifically, the knob 3 and the valve core 2 are sleeved on both ends of the connecting post 7 to achieve circumferential locking, and the knob 3 and the connecting post 7 are axially locked by screws.

[0071] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on the explanation herein, those skilled in the art can conceive of other specific embodiments of this utility model without creative effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A self-locking docking ball valve, comprising a valve body (1), wherein the valve body (1) is provided with an axially through flow channel (10). Valve core (2), which is rotatably installed in the flow channel (10), and has a through hole (20). Knob (3), the knob (3) is rotatably mounted on valve body (1), the knob (3) is connected to valve core (2), the knob (3) is used to drive valve core (2) to rotate to switch the opening and closing of flow channel (10); Its features are: The valve body (1) is provided with a connecting structure at one axial end. The connecting structure is used to lock a pair of valve bodies (1) and connect a pair of flow channels (10) to realize the docking of a pair of ball valves. The valve body (1) is provided with a self-locking device (4), wherein the self-locking device (4) includes a first pin (41) and a first elastic element (42). The first pin (41) is movably installed on the valve body (1). One end of the first pin (41) is provided with a contact (411). A self-locking component is provided between the first pin (41) and the knob (3). When the ball valve is not docked and the flow channel (10) is at least closed, the first elastic member (42) axially abuts against the first pin (41) to elastically push the contact (411) out of the valve body (1) near the docking structure. At this time, the self-locking member is coupled and the knob (3) cannot move. When a pair of ball valves are connected, the contacts (411) on both sides abut axially to drive the first pin (41) to move axially a preset distance. At this time, the self-locking component is decoupled, and the knob (3) can move.

2. The self-locking docking ball valve according to claim 1, characterized in that: The coupling structure includes an arc-extending locking groove (121) and a locking plate (122). One side of the locking groove (121) is provided with an insertion groove (123) adapted to the locking plate (122). The insertion groove (123) is located on one side of the circumferential extension direction of the locking groove (121). A pair of ball valves enter the insertion groove (123) on the other side axially through the locking plate (122) on one side and then rotate circumferentially so that the locking plate (122) enters the locking groove (121) to achieve docking.

3. A self-locking docking ball valve according to claim 2, characterized in that: It also includes a limiting surface (124), which is located at one end of the lock groove (121) circumferentially away from the insertion groove (123). The limiting surface (124) is used to restrict the locking piece (122) entering the lock groove (121) from rotating to abutting against the limiting surface (124), so that the contacts (411) on both sides abut against each other.

4. A self-locking docking ball valve according to claim 1, characterized in that: The self-locking component includes a locking cavity (31) on the knob (3) and a locking protrusion (412) on the first pin (41). When the self-locking component is coupled, the locking protrusion (412) enters the locking cavity (31). When the self-locking component is decoupled, the locking protrusion (412) moves out of the locking cavity (31). There are two locking cavities (31). When the knob (3) is rotated to the open or closed state of the flow channel (10), a pair of locking cavities (31) are respectively opposite to the locking protrusion (412).

5. A self-locking docking ball valve according to claim 4, characterized in that: The locking cavity (31) is located on the end face of the knob (3) near the valve body (1). The knob (3) has a movable cavity (32) on the radial inner side of the locking cavity (31). When the self-locking component is decoupled, the movable cavity (32) is used to accommodate the latch protrusion (412).

6. A self-locking docking ball valve according to claim 4, characterized in that: The valve body (1) is provided with a limiting seat (13), the first pin (41) is slidably mounted on the limiting seat (13), the limiting seat (13) is provided with a receiving groove (130) for receiving the first pin (41), one end of the first elastic member (42) abuts against the first pin (41), and the other end abuts against the receiving groove (130). An annular limiting cap (131) is installed at the opening end of the receiving groove (130) away from the knob (3). When the self-locking component is decoupled, the annular limiting cap (131) is used to restrict the first pin (41) from axially moving out of the receiving groove (130), and the contact (411) extends out from the inner hole of the annular limiting cap (131). The first pin (41) has an extension rod (413) at the end away from the contact (411). The extension rod (413) extends out from the receiving groove (130) in the direction away from the contact (411). The latch (412) is provided at the end of the extension rod (413) away from the contact (411). There is a gap between the knob (3) and the valve body (1) to receive the extension rod (413).

7. A self-locking docking ball valve according to claim 1, characterized in that: The valve body (1) has a symmetrically arranged locking protrusion (511) and locking hole (14) at one end near the connecting structure. The knob (3) has a cam drive surface (33). The valve body (1) has a sliding second pin (51). The locking protrusion (511) is located at one axial end of the second pin (51). The second pin (51) elastically abuts against the cam drive surface (33) away from the locking protrusion (511). The knob (3) can drive the second pin (51) to move through the cam drive surface (33) during rotation. After a pair of ball valves are connected, when the knob (3) is turned to the open state of the flow channel (10), the locking protrusions (511) on both sides enter the locking holes (14) on the opposite side to restrict the circumferential rotation of the pair of ball valves; when the knob (3) is turned to the closed state of the flow channel (10), the locking protrusions (511) on both sides move out of the locking holes (14).

8. A self-locking docking ball valve according to claim 1, characterized in that: A limiting bead (6) is provided between the knob (3) and the valve body (1). The knob (3) has an active groove (34) for receiving the limiting bead (6) at one end near the valve body (1). The valve body (1) has at least one limiting groove (15) that is adapted to the limiting bead (6) at one end near the knob (3). When the knob (3) is rotated to the point where the flow channel (10) is open, the limiting bead (6) is directly opposite to one of the limiting grooves (15). It also includes an adjusting rod (35), which is axially movably mounted on the knob (3). The adjusting rod (35) is located at the end of the limiting bead (6) away from the valve body (1). The adjusting rod (35) is provided with a limiting convex surface (351). When the limiting convex surface (351) abuts against the limiting bead (6), the end of the limiting bead (6) away from the limiting convex surface (351) is squeezed out of the movable groove (34) and thus limited in the limiting groove (15). When the movable adjusting rod (35) moves to the point where the limiting convex surface (351) is axially separated from the limiting bead (6), the limiting bead (6) can move in the movable groove (34) toward the end away from the valve body (1) and even move out of the limiting groove (15).

9. A self-locking docking ball valve according to claim 8, characterized in that: One end of the adjusting rod (35) extends outward from the outside of the knob (3) to form a button (352), and also includes a third elastic element (36) axially abutting against the adjusting rod (35). In the reset state, the adjusting rod (35) is moved by the elastic force of the third elastic element (36) to the limiting convex surface (351) and abut against the limiting bead (6); Pressing the button (352) allows the adjusting rod (35) to move until the limiting convex surface (351) is axially separated from the limiting bead (6).

10. A self-locking docking ball valve according to claim 1, characterized in that: A connecting post (7) is connected between the knob (3) and the valve core (2). The connecting post (7) radially penetrates the side wall of the valve body (1) and is rotatably connected to the valve body (1). A sealing ring (71) is provided between the connecting post (7) and the valve body (1). A limiting cover (8) is provided on the side wall of the valve body (1). A through hole (80) is provided on the limiting cover (8). A limiting step (72) is provided on the connecting post (7) axially abutting against the inner side of the limiting cover (8). The connecting post (7) axially extends out of the through hole (80) and is connected to the knob (3).

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