Floating ball valve with pre-tightening function

Abstract

The invention relates to the technical field of floating ball valves, in particular to a floating ball valve with a pre-tightening function, which comprises a valve body, a first mounting part is arranged on one side of the valve body, a second mounting part is arranged on one side, far away from the first mounting part, of the valve body, and the first mounting part and the second mounting part are connected through a plurality of groups of fastening rods. Bolts are arranged on each fastening rod, the first installation piece and the second installation piece, and sealing pieces are arranged between the first installation piece and the valve body and between the second installation piece and the valve body. A ball body is arranged in the valve body, and a fixing groove is formed in the ball body; a valve rod is rotationally connected to the valve body, and a pre-fixing assembly is arranged between the valve rod and the ball body. In the installation process, the situation that the valve rod cannot be accurately inserted into the fixing groove of the ball body due to the fact that the ball body rolls in the valve body can be avoided, and therefore the installation efficiency of the ball body in the ball valve can be greatly improved, the use effect is better, and the ball valve is suitable for wide application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of floating ball valves, in particular to a floating ball valve with a pre-tightening function. Background Art

[0002] A ball valve is a valve whose opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. The ball of a floating ball valve floats. Under the pressure of the medium, the ball can produce a certain displacement and press against the sealing surface of the outlet to ensure the sealing of the outlet. Ball valves have a wide range of applications due to their small flow resistance, fast switching, good sealing performance, long service life, and easy pneumatic and electrical control.

[0003] Floating ball valve is an important type of ball valve, with the characteristics of compact structure, reliable sealing, simple structure, easy maintenance, etc. Since the sealing surface formed by the ball and the valve seat is often in a closed state, it is not easy to be damaged by medium erosion, easy to operate and maintain, suitable for general working media such as water, solvents, acids and natural gas, but also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc., and is widely used in various industries.

[0004] The ball valve opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. The hard-sealed V-type ball valve has a strong shear force between its V-type ball core and the metal valve seat with hard alloy surfacing. It is particularly suitable for media containing fibers, tiny solid particles, etc. The multi-way ball valve can not only flexibly control the confluence, diversion, and flow direction switching of the medium in the pipeline, but also close any channel to connect the other two channels.

[0005] The floating ball valve in the prior art, such as the Chinese patent with application number 202122688284.6, authorization announcement number CN216279506U, and name of a floating ball valve, discloses a floating ball valve in the above patent, which specifically relates to the field of ball valves, including a ball valve body, the top of the ball valve body is fixedly connected with a connecting base, the two ends of the ball valve body are respectively fixedly connected with flanges, the top of the connecting base is provided with a knob, the inner side of the knob is movably sleeved with a hexagonal nut, and the bottom end of the knob is fixedly connected with a transmission rod; in the above patent, a transmission rod, an opening and closing ball, a check ball and a connecting rod are provided, so that the device can be used to drive the check ball to rotate through the connecting rod during use, and then the check ball can control the liquid flow direction of the floating ball valve under the action of its inner reset spring and the sealing block to avoid reverse reflux, thereby solving the problem that the liquid in the ball valve refluxes when the existing device is used and cannot be safely isolated. Another example is a Chinese patent with application number 202420388358.5, authorization announcement number CN221857720U, and name "A floating ball valve". The above patent discloses a floating ball valve, including a valve body and a valve stem, and also includes an adjusting assembly. The adjusting assembly includes a connecting disk, a limit slide, a movable slider, an adjusting seat, a rotating disk, a locking base, a locking bolt and a force member. The connecting disk is fixedly connected to the valve stem, the limit slide is fixedly connected to the connecting disk, the movable slider is slidably connected to the limit slide, the adjusting seat is fixedly connected to the movable slider, the rotating disk is fixedly connected to the adjusting seat, the locking base is fixedly connected to the limit slide, the locking bolt is arranged on the locking base, and the force member is arranged on the rotating disk. The valve body is moved to the corresponding operating height of the operator through the adjustment of the rotating disk, thereby avoiding the operator from bending over for a long time to cause physical burden on the operator.

[0006] It is known that during the use of a ball valve, a valve stem is usually used to drive the ball to rotate inside the valve body, thereby realizing the opening and closing of the ball valve. During the installation of the ball, it is usually necessary to place the ball inside the valve body, then straighten the position of the ball so that the valve stem can be accurately stuck in the limit groove on the ball, and then use the valve stem to drive the ball to rotate. The above installation process can ensure the accuracy of the ball installation to a certain extent, but during the installation of the ball, it is necessary to support the ball by hand so that the ball is vertically upward. At this time, it is also necessary to promptly insert the valve stem from the top of the valve body downward until it is inserted into the ball limit groove. If the valve stem is not inserted into the ball limit groove, the ball valve cannot be used normally. This installation method has a cumbersome operation process and certain shortcomings. Summary of the invention

[0007] The object of the present invention is to provide a floating ball valve with a pre-tightening function to solve the problems raised in the above background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a floating ball valve with a pre-tightening function, comprising a valve body, a first mounting member is arranged on one side of the valve body, a second mounting member is arranged on the side of the valve body away from the first mounting member, the first mounting member and the second mounting member are connected by a plurality of sets of fastening rods, and each fastening rod and the first mounting member and the second mounting member are provided with bolts, and a sealing member is arranged between the first mounting member, the second mounting member and the valve body; a ball is arranged inside the valve body, and a fixing groove is opened on the ball; a valve stem is rotatably connected to the valve body, and a pre-fixing assembly is arranged between the valve stem and the ball; the pre-fixing assembly comprises an extension block slidably connected to the bottom of the valve stem, an elastic member is arranged between the extension block and the valve stem, the elastic member drives the extension block to slide downward, and an adjusting mechanism is arranged between the extension block and the valve stem.

[0009] Furthermore, a connecting rod is fixedly connected to the bottom of the valve stem, a mounting groove is provided inside the connecting rod, the extension block is slidably connected to the bottom of the connecting rod through the mounting groove, and the elastic member is arranged between the mounting groove and the extension block.

[0010] Furthermore, the regulating mechanism comprises an regulating rod vertically slidably connected to the connecting rod, the valve stem is provided with a driving member for driving the regulating rod to slide vertically; and a clamping member is provided between the extension block and the regulating rod.

[0011] Furthermore, the clamping member includes two clamping blocks which are slidably connected to each other on both sides of the adjusting rod, and adapting grooves are provided on both sides of the adjusting rod. Each clamping block is slidably connected to the adjusting rod through the corresponding adapting groove, and a spring is provided between each clamping block and the corresponding adapting groove; and a clamping groove adapted to the clamping block is provided on the extension block, and the elastic force of the spring drives the clamping block to be intermittently engaged with the clamping groove.

[0012] Furthermore, the driving member includes a threaded sleeve rotatably connected to the valve stem through a limit ring, the adjusting rod is slidably connected to a screw rod through a buffer member, the screw rod is threadedly connected to the threaded sleeve; and a driving cap is provided on the threaded sleeve.

[0013] Furthermore, the buffer member includes a protrusion fixedly connected to the side wall of the adjusting rod, a sliding groove is provided on the adjusting rod, the threaded rod is vertically slidably connected in the sliding groove, and a vertical groove is also provided on the side wall of the adjusting rod, and the protrusion is vertically slidably connected in the vertical groove.

[0014] Furthermore, a fastening mechanism is provided between the extension block and the sphere; the fastening mechanism comprises a clamping block slidably connected to the extension block, the sphere is provided with a clamping groove adapted to the clamping block, and the clamping block is intermittently clamped with the clamping groove; each of the clamping blocks is slidably connected to the extension block via a corresponding limit strip; and a driving unit for driving the clamping block to slide is provided inside the extension block.

[0015] Furthermore, the driving unit includes a driving screw rotatably connected to the extension block, the clamping block is provided with a threaded hole adapted to the driving screw, the driving screw is threadedly connected to the threaded hole; and a trigger member for driving the driving screw to rotate is provided between the extension block and the connecting rod.

[0016] Furthermore, the trigger member includes a trigger rod vertically slidably connected to the extension block, the trigger rod is fixedly connected to a connecting frame, a rack is installed on the connecting frame, and a spur gear is fixedly connected to the driving screw, and the spur gear is meshed with the rack.

[0017] Furthermore, a connecting plate is provided on the valve stem, the connecting plate is sleeved with the valve stem through a limiting groove, and a handle for driving the valve stem to rotate is provided on the connecting plate.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: the floating ball valve with a pre-tightening function cooperates with the valve stem, the ball, the fixing groove, the valve stem, the extension block, the elastic member and the adjusting mechanism, so that during use, the extension block at this moment slides downward under the elastic action of the elastic member, and when the ball needs to be installed inside the valve body, the ball is held and slid toward the inside of the valve body at this moment, and the fixing groove on the ball is aligned with the extension block at this moment, and then the ball is pushed forward, and after the extension block contacts the ball, it will overcome the elastic force of the elastic member and then slide upward, and when the ball slides to the bottom of the extension block at this moment, the extension block is just located inside the fixing groove, and the elastic member drives the extension block to be connected into the fixing groove during the process of restoring its elastic deformation, and at this moment the extension block limits the ball, and the ball will not roll inside the valve body at this moment, and then the valve stem is connected to the ball by using the adjusting mechanism, so that the rotation of the ball can be operated by the valve stem, thereby meeting the working needs. During this installation process, the ball can be prevented from rolling inside the valve body, which would cause the valve stem to be unable to be accurately inserted into the fixing groove of the ball. Therefore, the installation efficiency of the ball in the ball valve can be greatly improved, the use effect is better, and it is suitable for wide promotion and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0020] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the overall explosion state structure provided by an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of the valve stem and ball installation method provided in an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of a sphere hidden state structure provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of a valve stem structure provided in an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of a valve stem in a top view provided by an embodiment of the present invention;

[0026] Figure 7 for Figure 6 Schematic diagram of the AA section structure along the middle edge;

[0027] Figure 8 for Figure 7 Schematic diagram of the enlarged structure of the A area in the middle

[0028] Fig. 9 A schematic diagram of the structure of the driving member in the explosion state provided by an embodiment of the present invention;

[0029] Fig.10 A schematic diagram of the structure of the installation method of the trigger member and the drive unit provided in an embodiment of the present invention;

[0030] Fig.11 A schematic diagram showing another perspective of the installation method of the trigger member and the drive unit provided in an embodiment of the present invention;

[0031] Fig.12 A schematic diagram of a spherical body installation structure provided in an embodiment of the present invention;

[0032] Fig.13 for Figure 7 Schematic diagram of the enlarged structure of the B area.

[0033] Explanation of the reference numerals: 1. valve body; 2. first mounting member; 3. second mounting member; 4. fastening rod; 5. bolt; 6. valve stem; 7. connecting plate; 8. handle; 9. ball; 10. sealing member; 11. fixing groove; 12. connecting rod; 121. mounting groove; 13. extension block; 14. screw; 15. threaded sleeve; 151. limiting ring; 16. driving cap; 17. clamping groove; 18. adjusting rod; 19. clamping member; 191. clamping block; 192. spring; 193. adapter groove; 20. clamping groove; 21. clamping block; 22. limiting strip; 23. driving screw; 24. spur gear; 25. rack; 26. trigger rod; 27. connecting frame; 28. buffer member, 281. protrusion; 282. vertical groove. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figure 1-Figure 13 The present invention provides a technical solution: a floating ball valve with a pre-tightening function, comprising a valve body 1, a first mounting member 2 is arranged on one side of the valve body 1, a second mounting member 3 is arranged on the side of the valve body 1 away from the first mounting member 2, the first mounting member 2 and the second mounting member 3 are connected by a plurality of sets of fastening rods 4, and each fastening rod 4 and the first mounting member 2 and the second mounting member are provided with bolts 5, and a sealing member 10 is arranged between the first mounting member 2 and the second mounting member 3 and the valve body 1; a ball 9 is arranged inside the valve body 1, and a fixing groove 11 is opened on the ball 9; a valve stem 6 is rotatably connected to the valve body 1, and a pre-fixing assembly is arranged between the valve stem 6 and the ball 9; the pre-fixing assembly includes an extension block 13 slidably connected to the bottom of the valve stem 6, an elastic member is arranged between the extension block 13 and the valve stem 6, the elastic member drives the extension block 13 to slide downward, and an adjustment mechanism is arranged between the extension block 13 and the valve stem 6.

[0036] Specifically, the floating ball valve with pre-tightening function includes a valve body 1, wherein a first mounting member 2 is provided on one side of the valve body 1, and a second mounting member 3 is provided on the side of the valve body 1 away from the first mounting member 2, and the first mounting member 2 and the second mounting member 3 are connected by multiple sets of fastening rods 4, so as to facilitate the use of the ball valve. Moreover, each fastening rod 4 and the first mounting member 2 and the second mounting member are provided with bolts 5, and the fastening rod 4 is fixed to the first mounting member 2, the second mounting member 3 and the valve body 1 by the bolts 5, so as to improve the stability of the floating ball valve when in use, and achieve a better use effect. A sealing member 10 is provided between the first mounting member 2 and the second mounting member 3 and the valve body 1. Specifically, the sealing member 10 includes a sealing ring. An annular groove adapted to the sealing ring is provided on the first mounting member 2 and the valve body 1. When the fastening rod 4 fixes the first mounting member 2 and the valve body 1, the sealing ring will be clamped between the first mounting member 2 and the valve body 1 when the first mounting member 2 and the valve body 1 are fitted at this moment, thereby improving the sealing performance of the floating ball valve and achieving better use effect. A ball 9 is provided inside the valve body 1. The ball 9 is the prior art. A flow groove is provided in the middle of the ball 9 to facilitate the flow of the medium. At the same time, a fixing groove 11 is provided on the ball 9 to facilitate the installation of the ball 9. At the same time, it is also convenient to drive the ball 9 to move through the cooperation of the later valve stem 6 and the fixing groove 11, further meeting the working needs. A valve stem 6 is rotatably connected to the valve body 1. When in use, the movement of the ball 9 is controlled by the valve stem 6 to realize the opening and closing of the ball valve. A pre-fixing assembly is provided between the valve stem 6 and the ball 9 to facilitate the installation of the ball 9. The pre-fixing assembly includes an extension block 13 slidably connected to the bottom of the valve stem 6, and an elastic member is provided between the extension block 13 and the valve stem 6, and the elastic member drives the extension block 13 to slide downward. An adjustment mechanism is provided between the extension block 13 and the valve stem 6, so that the state of the extension block 13 can be limited by the adjustment mechanism, so as to facilitate the adjustment of the state of the ball 9 according to work needs in the later stage to meet work needs. Therefore, during use, the extension block 13 at this moment slides downward under the elastic action of the elastic member. When the ball 9 needs to be installed inside the valve body 1, the ball 9 is held and slid into the valve body 1 at this moment. At this moment, the fixing groove 11 on the ball 9 can be aligned with the extension block 13, and then the ball 9 is pushed forward. After the extension block 13 contacts the ball 9, it will overcome the elastic force of the elastic member and slide upward. When the ball 9 slides to the bottom of the extension block 13 at this moment, the extension block 13 is just located inside the fixing groove 11. In the process of restoring the elastic deformation, the elastic member drives the extension block 13 to be clamped into the fixing groove 11. At this moment, the extension block 13 limits the ball 9, and the ball 9 will not roll inside the valve body 1. Then, the valve stem 6 is connected to the ball 9 using the adjusting mechanism, so that the rotation of the ball 9 can be operated by the valve stem 6, thereby meeting the working needs.During this installation process, the ball 9 can be prevented from rolling inside the valve body 1, which would cause the valve stem 6 to be unable to be accurately inserted into the fixing groove 11 of the ball 9. Therefore, the installation efficiency of the ball 9 in the ball valve can be greatly improved, the use effect is better, and it is suitable for wide promotion and use.

[0037] In the embodiment provided by the present invention, a connecting rod 12 is fixedly connected to the bottom of the valve stem 6, a mounting groove 121 is opened inside the connecting rod 12, an extension block 13 is slidably connected to the bottom of the connecting rod 12 through the mounting groove 121, and an elastic member is arranged between the mounting groove 121 and the extension block 13, thereby improving the stability of the extension block 13 when sliding.

[0038] In the embodiment provided by the present invention, the adjustment mechanism includes an adjustment rod 18 vertically slidably connected to the connecting rod 12, and a driving member for driving the adjustment rod 18 to slide vertically is provided on the valve stem 6; and a clamping member 19 is provided between the extension block 13 and the adjustment rod 18, and the clamping member 19 includes two clamping blocks 191 slidably connected to both sides of the adjustment rod 18 in opposite directions, and an adapting groove 193 is provided on both sides of the adjustment rod 18, and each clamping block 191 is slidably connected to the adjustment rod 18 through the corresponding adapting groove 193, and a spring 192 is provided between each clamping block 191 and the corresponding adapting groove 193; and a spring 192 is provided on the extension block 13 to The block 191 is matched with the slot 17, and the elastic force of the spring 192 drives the block 191 to intermittently engage with the slot 17. The driving member includes a threaded sleeve 15 that is rotatably connected to the valve stem 6 through a limit ring 151. The adjusting rod 18 is slidably connected to a screw rod 14 through a buffer member 28, and the screw rod 14 is threadedly connected to the threaded sleeve 15; and a driving cap 16 is provided on the threaded sleeve 15, and the buffer member 28 includes a protrusion fixedly connected to the side wall of the adjusting rod 18, a sliding groove is provided on the adjusting rod 18, and the threaded rod is vertically slidably connected in the sliding groove, and a vertical groove 282 is also provided on the side wall of the adjusting rod 18, and the protrusion 281 is vertically slidably connected in the vertical groove 282.

[0039] Therefore, during use, when the ball 9 needs to be installed inside the valve body 1, the ball 9 is held and slid toward the inside of the valve body 1. At this moment, the fixing groove 11 on the ball 9 can be aligned with the extension block 13, and then the ball 9 is pushed forward. After the extension block 13 contacts the ball 9, it will overcome the elastic force of the elastic member and slide upward. At this moment, the extension block 13 slides upward and drives the card block 191 to be connected to the inside of the card groove 17. If the extension block 13 still fails to slide smoothly into the inside of the fixing groove 11 at this moment, the extension block 13 will drive the adjusting rod 18 to slide upward together, so that the protrusion 281 on the adjusting rod 18 slides inside the vertical groove 282 to avoid motion interference.

[0040] In the embodiment provided by the present invention, a fastening mechanism is further provided between the extension block 13 and the sphere 9; the fastening mechanism includes a clamping block 21 slidably connected to the extension block 13, a clamping groove 20 adapted to the clamping block 21 is provided on the sphere 9, and the clamping block 21 is intermittently clamped with the clamping groove 20; each clamping block 21 is slidably connected to the extension block 13 through a corresponding limit strip 22; and a driving unit for driving the clamping block 21 to slide is provided inside the extension block 13. In the embodiment provided by the present invention, the driving unit includes a driving screw 23 rotatably connected to the extension block 13, a threaded hole adapted to the driving screw 23 is provided on the clamping block 21, and the driving screw 23 is threadedly connected to the threaded hole; and a trigger for driving the driving screw 23 to rotate is provided between the extension block 13 and the connecting rod 12. In the embodiment provided by the present invention, the trigger member includes a trigger rod 26 vertically slidably connected to the extension block 13, a connecting frame 27 is fixedly connected to the trigger rod 26, and a rack 25 is installed on the connecting frame 27, and a spur gear 24 is fixedly connected to the driving screw 23, and the spur gear 24 is meshed with the rack 25.

[0041] Therefore, in order to improve the stability of the valve stem 6 and the ball 9 during installation, the threaded sleeve 15 is driven to rotate by the driving cap 16 at this moment, and the screw sleeve 15 drives the screw 14 to rotate during the rotation process. When the screw 14 slides upward, the adjustment rod 18 is driven to slide upward through the cooperation between the protrusion 281 and the vertical groove 282. When the adjustment rod 18 slides upward, it will drive the extension block 13 to slide upward. At this moment, the trigger rod 26 will abut against the bottom of the connecting rod 12. When the extension block 13 continues to slide upward, the driving screw 23 is driven to rotate through the cooperation between the rack 25 and the spur gear 24, and then the clamping block 21 can be driven to slide out of the extension block 13 and slide to the side of the clamping groove 20 inside the ball 9, so that the clamping block 21 is clamped close to the clamping groove 20, so that the valve stem 6 and the ball 9 are more closely connected to meet the working needs.

[0042] In the embodiment provided by the present invention, a connecting plate 7 is provided on the valve stem 6, and the connecting plate 7 is sleeved with the valve stem 6 through a limiting groove, and a handle 8 for driving the valve stem 6 to rotate is provided on the connecting plate 7, so that the valve stem 6 can be driven to rotate conveniently through the cooperation between the handle 8 and the connecting plate 7 to meet working needs.

[0043] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A floating ball valve with a pre-tightening function, comprising a valve body (1), wherein a first mounting member (2) is arranged on one side of the valve body (1), and a second mounting member (3) is arranged on a side of the valve body (1) away from the first mounting member (2), wherein the first mounting member (2) and the second mounting member (3) are connected via a plurality of sets of fastening rods (4), and each fastening rod (4) and the first mounting member (2) and the second mounting member are fastened with bolts (5), characterized in that: A sealing member (10) is provided between the first mounting member (2) and the second mounting member (3) and the valve body (1); A ball (9) is arranged inside the valve body (1), and a fixing groove (11) is provided on the ball (9); A valve stem (6) is rotatably connected to the valve body (1), and a pre-fixing component is provided between the valve stem (6) and the ball (9); The pre-fixing assembly comprises an extension block (13) slidably connected to the bottom of the valve stem (6), an elastic member is arranged between the extension block (13) and the valve stem (6), the elastic member drives the extension block (13) to slide downward, and an adjustment mechanism is arranged between the extension block (13) and the valve stem (6).

2. A floating ball valve with pre-tightening function according to claim 1, characterized in that: A connecting rod (12) is fixedly connected to the bottom of the valve stem (6), a mounting groove (121) is provided inside the connecting rod (12), the extension block (13) is slidably connected to the bottom of the connecting rod (12) through the mounting groove (121), and the elastic member is arranged between the mounting groove (121) and the extension block (13).

3. A floating ball valve with pre-tightening function according to claim 2, characterized in that: The regulating mechanism comprises an regulating rod (18) vertically slidably connected to a connecting rod (12); a driving member for driving the regulating rod (18) to vertically slide is arranged on the valve stem (6); and a clamping member (19) is arranged between the extension block (13) and the regulating rod (18).

4. The floating ball valve with pre-tightening function according to claim 3 is characterized in that: The clamping member (19) comprises two clamping blocks (191) slidably connected to the two sides of the adjusting rod (18) in opposite directions, and an adapting groove (193) is provided on both sides of the adjusting rod (18), each clamping block (191) is slidably connected to the adjusting rod (18) through the corresponding adapting groove (193), and a spring (192) is provided between each clamping block (191) and the corresponding adapting groove (193); A clamping groove (17) adapted to the clamping block (191) is provided on the extension block (13), and the elastic force of the spring (192) drives the clamping block (191) to be intermittently clamped with the clamping groove (17).

5. The floating ball valve with pre-tightening function according to claim 4, characterized in that: The driving member comprises a threaded sleeve (15) rotatably connected to the valve stem (6) via a limit ring (151); the adjusting rod (18) is slidably connected to a screw rod (14) via a buffer member (28); the screw rod (14) is threadedly connected to the threaded sleeve (15); and a driving cap (16) is provided on the threaded sleeve (15).

6. The floating ball valve with pre-tightening function according to claim 5, characterized in that: The buffer member (28) comprises a protrusion (281) fixedly connected to the side wall of the adjusting rod (18); a slide groove is provided on the adjusting rod (18), and the threaded rod is vertically slidably connected in the slide groove; and a vertical groove (282) is also provided on the side wall of the adjusting rod (18), and the protrusion (281) is vertically slidably connected in the vertical groove (282).

7. The floating ball valve with pre-tightening function according to claim 4, characterized in that: A fastening mechanism is also provided between the extension block (13) and the spherical body (9); The fastening mechanism comprises a clamping block (21) slidably connected to the extension block (13); a clamping groove (20) adapted to the clamping block (21) is provided on the sphere (9); the clamping block (21) is intermittently clamped with the clamping groove (20); each of the clamping blocks (21) is slidably connected to the extension block (13) via a corresponding limit strip (22); and a driving unit for driving the clamping block (21) to slide is provided inside the extension block (13).

8. The floating ball valve with pre-tightening function according to claim 7, characterized in that: The driving unit comprises a driving screw (23) rotatably connected to the extension block (13); a threaded hole matching the driving screw (23) is provided on the clamping block (21); and the driving screw (23) is threadedly connected to the threaded hole; A triggering member for driving the driving screw rod (23) to rotate is provided between the extension block (13) and the connecting rod (12).

9. The floating ball valve with pre-tightening function according to claim 8, characterized in that: The trigger member comprises a trigger rod (26) vertically slidably connected to the extension block (13); a connecting frame (27) is fixedly connected to the trigger rod (26); a rack (25) is mounted on the connecting frame (27); a spur gear (24) is fixedly connected to the driving screw rod (23); and the spur gear (24) is meshed with the rack (25).

10. The floating ball valve with pre-tightening function according to claim 1, characterized in that: The valve stem (6) is provided with a connecting plate (7), the connecting plate (7) is sleeved with the valve stem (6) via a limiting groove, and a handle (8) for driving the valve stem (6) to rotate is provided on the connecting plate (7).

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