Ball valve capable of accurately adjusting flow

Abstract

The invention relates to the technical field of valves, and discloses a flow precise adjustable ball valve which comprises a lower valve body and a V-opening valve ball rotationally inserted into the lower wall of an inner cavity of the lower valve body, valve seats movably and hermetically abutted against the V-opening valve ball are slidably clamped to the left side and the right side of the lower valve body, and an upper valve body is adaptively mounted at the upper end of the lower valve body. A worm tooth column movably clamped to the top of the V-opening valve ball is rotationally connected to the middle of the upper valve body, and a tooth worm meshed with the worm tooth column is rotationally connected to the right side of the inner wall of the upper valve body. The hand wheel column and the transmission gear are locked through the limiting assembly, the situation that a tooth worm is vibrated or the hand wheel column is touched to conduct self-deflection to drive the V-opening valve ball to deflect is avoided, and before the hand wheel column rotates to adjust flow, the rotating handle is lifted to drive the adjusting assembly, so that the valve seats on the two sides move back to back to be separated from the V-opening valve ball, and therefore the flow is adjusted. By means of the mechanism that the hand wheel column and the transmission gear are unlocked only when the V-opening valve ball deflects, mutual abrasion between the V-opening valve ball and the valve seat during deflection is avoided, and the accuracy of flow control during follow-up valve work is improved.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a ball valve with precise flow adjustment. Background Technology

[0002] Ball valves are mainly used in pipelines for shut-off, distribution, and changing the flow direction of media. Due to their low fluid resistance, simple structure, isolation of the sealing surfaces of the ball and seat from the media, smooth and flat flow path that prevents media deposition, and suitability for both general working media and media under harsh conditions, ball valves are widely used in various fields such as petroleum, chemical, power generation, papermaking, nuclear energy, aviation, and rocketry.

[0003] Currently, ball valves used for flow regulation are typically V-type ball valves. The valve core of a V-type ball valve has a V-shaped notch structure, which enables precise and stable regulation of the medium flow during rotation. It can also be used for media containing particles and fibers. In general manual V-type ball valves, the valve core can be self-locked by using a worm gear mechanism. However, under vibration conditions, the worm can still accidentally deflect slightly. At the same time, the handwheel connected to the worm can also be accidentally activated, causing the valve core to deflect and resulting in changes in flow. Furthermore, when the valve core deflection is controlled, the valve seat is always in contact with the valve ball to ensure sealing. After long-term use, the two are prone to mutual wear, leading to sealing leakage and affecting the accuracy of flow regulation. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of unreliable self-locking and insufficient flow regulation caused by mutual wear between the valve seat and the valve ball in the use of general V-type ball valves. This invention provides a ball valve with precise flow adjustment.

[0005] To achieve the above objectives, the present invention specifically adopts the following technical solution: A ball valve with precise flow adjustment includes a lower valve body and a V-port valve ball rotatably inserted into the lower wall of its inner cavity. Valve seats are slidably engaged with the V-port valve ball on both the left and right sides of the lower valve body. An upper valve body is fitted onto the upper end of the lower valve body. A worm gear column is rotatably connected to the middle of the upper valve body and movably engaged with the top of the V-port valve ball. A worm gear meshing with the worm gear column is rotatably connected to the inner wall of the upper valve body. A shaft block is provided on the upper wall of the inner cavity of the upper valve body. A transmission gear meshing with the worm gear is rotatably connected to the front wall of the shaft block. A handwheel column is slidably engaged in the transmission gear on the front wall of the upper valve body. A pressure plate movably abuts against the transmission gear is fixedly sleeved on the handwheel column. The bottom of the upper valve body cavity is provided with a limiting component that locks the handwheel column and the valve seats on both sides. The upper wall of the upper valve body is rotatably connected to a handle, and the handle is provided with an adjustment component that drives the limiting component to move the valve seats on both sides in opposite directions and the handwheel column forward.

[0006] Furthermore, the upper wall of the upper valve body has two circularly arrayed arc grooves, and the top of the worm gear column is fixedly connected to an indicator frame that passes through the two arc grooves and is U-shaped. The upper wall of the upper valve body is fixedly connected to a flow indicator disk that is coaxial with the arc grooves, and the top two ends of the indicator frame are arc-convex.

[0007] Furthermore, the top of the V-port valve ball has a rectangular opening, and the bottom end of the worm gear column has a rectangular block that matches the rectangular opening and has a rounded bottom edge design.

[0008] Furthermore, the limiting component includes a limiting post that is slidably engaged between the shaft block and the rear wall of the upper valve body. The front end of the limiting post is rotatably connected to the handwheel post. The rear end of the pressure plate is provided with an elastic friction surface, which can be, for example, a rubber pad.

[0009] Furthermore, the limiting assembly also includes an elastic slide plate slidably connected to the inner wall of the upper valve body. A hinge rod is movably connected between the elastic slide plate and the limiting post. An L-shaped guide rod that movably seals and passes through the lower wall of the upper valve body is fixedly connected around the elastic slide plate. Guide grooves that slide and engage with the corresponding L-shaped guide rods are provided on the front and rear walls of the valve seat.

[0010] Furthermore, the guide groove is composed of an outer vertical groove and an outer inclined groove that slopes towards the V-shaped valve ball from top to bottom, and the top edge of the guide groove is chamfered.

[0011] Furthermore, a key protrusion is provided on the side of the valve seat away from the V-port valve ball at both the upper and lower ends, and a key groove corresponding to the key protrusion is provided on the upper and lower walls of the inner cavities on both the left and right sides of the lower valve body.

[0012] Furthermore, the bottom of the upper valve body protrudes in a columnar shape and slides into the upper end of the lower valve body. The inner cavity in the middle of the lower valve body is adapted to the bottom of the upper valve body. The bottom of the upper valve body has an upper hemispherical groove with a radius greater than the radius of the V-shaped valve ball. The lower wall of the inner cavity in the middle of the lower valve body has a lower hemispherical groove that can form a complete sphere with the upper hemispherical groove. The left and right sides of the bottom of the upper valve body are provided with semi-circular grooves adapted to the valve seat.

[0013] Furthermore, the adjustment component includes a rectangular groove formed in the middle of the limiting post, and limiting grooves are formed on the left and right walls of the rectangular groove. The limiting groove is formed by connecting and combining a lower vertical groove, a middle inclined groove, and an upper vertical groove from front to back and from bottom to top. A T-shaped guide rod is slidably engaged between the upper and lower walls of the upper valve body, and a pin is fixedly inserted into the middle of the T-shaped guide rod and slidably engaged with the limiting groove. The handle is U-shaped and has a sliding groove running through its right side. The top of the T-shaped guide rod is slidably engaged with the sliding groove, and the T-shaped guide rod moves through the elastic slide plate.

[0014] Furthermore, the top and bottom peripheries of the T-shaped guide rod are provided with two symmetrical key protrusions, and the upper and lower walls of the upper valve body cavity are provided with key grooves corresponding to the key protrusions.

[0015] The beneficial effects of this invention are as follows: 1. This invention uses a limiting component to lock the handwheel column and keeps the pressure plate in contact with the transmission gear, thereby preventing the worm gear from deflecting due to vibration or accidental contact, which would cause the V-port valve ball to deflect and affect the flow rate. Before adjusting the flow rate by rotating the handwheel column, the mechanism of lifting the handle to move the valve seats on both sides away from the V-port valve ball and moving the handwheel column forward unlocks the handwheel column and transmission gear. This avoids mutual wear between the handwheel column and the valve seat when the V-port valve ball is deflected by rotating the handwheel column, thus improving the accuracy of flow control during subsequent valve operation.

[0016] 2. In this invention, during valve installation, the V-port valve ball and the valve seats on both sides are pre-set in the lower valve body according to the specified pattern and position. Then, the upper and lower valve bodies are matched and connected. The upper valve body can automatically drive the V-port valve ball and valve seats, making installation and maintenance convenient. When adjusting the valve, the handwheel column and handle facilitate two-handed control by the operator. In addition, before rotating the handwheel column, a mechanism is set to lift the handle to control the valve seats on both sides to move away from the V-port valve ball, ensuring the reliability of the valve for long-term use. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the ball valve of the present invention; Figure 2 This is a three-dimensional sectional view of the lower valve body and upper valve body of the ball valve of the present invention; Figure 3 This is a three-dimensional sectional view of the lower valve body and valve seat portion of the ball valve of the present invention; Figure 4 This is a three-dimensional structural diagram of the lower valve body and valve seat of the ball valve of the present invention; Figure 5 This is a three-dimensional structural diagram of the ball valve seat and guide groove of the present invention; Figure 6 This is a three-dimensional structural diagram of the upper valve body and worm gear column of the ball valve of the present invention; Figure 7 This is a three-dimensional structural diagram of the ball valve indicator and handle portion of the present invention; Figure 8 This is a three-dimensional exploded view of the cross-sectional portion of the ball valve T-shaped guide rod and the upper valve body of the present invention; Figure 9 This is a three-dimensional structural diagram of the ball valve limiting post and elastic slide plate of the present invention.

[0018] Reference numerals: 1. Lower valve body; 11. V-port valve ball; 12. Valve seat; 13. Guide groove; 2. Upper valve body; 21. Worm gear column; 22. Indicator frame; 23. Worm gear; 24. Flow indicator disc; 3. Shaft block; 31. Limiting post; 32. Limiting groove; 33. Transmission gear; 34. Handwheel column; 35. Pressure plate; 4. Elastic slide plate; 41. Hinge rod; 42. L-shaped guide rod; 5. Rotary handle; 51. Slide groove; 52. T-shaped guide rod; 53. Pin. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0020] Example 1, as Figures 1-9 As shown, a flow-adjustable ball valve includes a lower valve body 1 and a V-port valve ball 11 rotatably inserted into the lower wall of its inner cavity. Valve seats 12 are slidably engaged on both sides of the lower valve body 1, sealingly abutting against the V-port valve ball 11. An upper valve body 2 is fitted onto the upper end of the lower valve body 1. A worm gear column 21 is rotatably connected to the middle of the upper valve body 2 and movably engaged with the top of the V-port valve ball 11. A worm gear 23 meshing with the worm gear column 21 is rotatably connected to the inner wall of the upper valve body 2. A shaft block 3 is provided on the upper wall of the inner cavity of the upper valve body 2. A transmission gear 33 meshing with the worm gear 23 is rotatably connected to the front wall of the shaft block 3. A handwheel column 34 slidably engaged in the transmission gear 33 is provided on the front wall of the upper valve body 2. The handwheel column 34 can be mounted on the front wall of the upper valve body 2 via a cylindrical roller bearing. The cylindrical roller bearing allows the handwheel column 34 to move slightly axially. A pressure plate 35 is fixedly sleeved on the handwheel column 34 and movably abutting against the transmission gear 33. The bottom of the inner cavity of the upper valve body 2 is provided with a limiting component that locks the handwheel column 34 and the valve seats 12 on both sides. The upper wall of the upper valve body 2 is rotatably connected to a handle 5. The handle 5 is provided with an adjustment component that drives the limiting component to move the valve seats 12 on both sides in opposite directions and moves the handwheel column 34 forward.

[0021] Initially, the valve is in a self-locking state and fully closed. Driven by the limiting component, the valve seats 12 on both sides are locked and fully seal against the V-port valve ball 11, preventing external rotation of the handwheel column 34. The handwheel column 34 drives the pressure plate 35 to fully abut against the transmission gear 33, restricting its rotation. This further restricts the rotation of the worm gear 23 by utilizing the self-locking mechanism of the worm gear column 21 and the worm 23, ensuring that when the valve is used under vibration or the handwheel column 34 is accidentally touched, the worm gear 23 cannot drive the worm gear column 21, causing the V-port valve ball 11 to deflect and affecting flow control. When the valve needs to be opened, lifting the handle 5 automatically drives the limiting component, causing the valve seats 12 on both sides to move backward, disengaging from the V-port valve ball 11, and causing the handwheel column 34 to move slightly forward. Handwheel 34 causes pressure plate 35 to disengage from transmission gear 33. Since handwheel 34 remains slidably engaged in transmission gear 33 after a slight forward movement, rotation of handwheel 34 can rotate transmission gear 33. Transmission gear 33 meshes with worm gear 23, causing worm gear 21 to deflect. Worm gear 21 then causes V-port valve ball 11 to deflect non-contactly with valve seat 12, preventing mutual wear and leakage that could lead to poor sealing between valve seat 12 and V-port valve ball 11, affecting flow control. After V-port valve ball 11 is deflected to the required angle, pressing down handle 5 resets it. Adjustment component automatically drives limit component to move valve seats 12 towards each other to reset and seal against V-port valve ball 11. Handwheel 34 also causes pressure plate 35 to move backward to limit contact with transmission gear 33.

[0022] In embodiment two, based on the above embodiment, the upper wall of the upper valve body 2 has two circularly arrayed arc grooves. The top of the worm gear column 21 is fixedly connected to an indicator frame 22 that passes through the two arc grooves and is U-shaped. The upper wall of the upper valve body 2 is fixedly connected to a flow indicator disk 24 that is coaxial with the arc grooves. The top two ends of the indicator frame 22 are arc-convex.

[0023] The curved design of the top two ends of the indicator bracket 22 facilitates the indication of the flow rate scale on the flow indicator dial 24, assisting in the control of the valve opening and achieving precise flow rate regulation.

[0024] In embodiment three, based on the above embodiments, the limiting component includes a limiting post 31 that is slidably engaged between the shaft block 3 and the rear wall of the upper valve body 2. The front end of the limiting post 31 is rotatably connected to the handwheel post 34. The rear end of the pressure plate 35 is provided with an elastic friction surface, and the elastic friction surface can be, for example, a rubber pad.

[0025] The adjustment component includes a rectangular groove in the middle of the limiting post 31. Limiting grooves 32 are provided on the left and right walls of the rectangular groove. The limiting grooves 32 are composed of a lower vertical groove, a middle inclined groove, and an upper vertical groove connected from front to back and from bottom to top. A T-shaped guide rod 52 is slidably engaged between the upper and lower walls of the upper valve body 2. A pin 53 that is slidably engaged with the limiting groove 32 is fixedly inserted into the middle of the T-shaped guide rod 52. The handle 5 is U-shaped and has a sliding groove 51 running through the front and rear of the right side. The top of the T-shaped guide rod 52 is slidably engaged with the sliding groove 51.

[0026] Initially, the pin 53 slides and engages in the lower vertical groove of the limiting groove 32. The pin 53 exerts a pressing force on the rear wall of the lower vertical groove, and the limiting post 31 exerts a pulling force on the handwheel post 34. The handwheel post 34 then drives the pressure plate 35 to press and fix the transmission gear 33 using its elastic friction surface, thus preventing the V-port valve ball 11 from being accidentally deflected, causing a change in valve flow and friction with the valve seat 12. When it is necessary to adjust the valve flow, the handle 5 is lifted upward, and the sliding groove 51 drives the T-shaped guide rod 52 to move upward. The pin 53 is then driven to slide from the lower vertical groove in the limiting groove 32 along the middle inclined groove and engage in the upper vertical groove, thereby driving the limiting post 31 to move the handwheel post 34 forward, releasing the fixing effect of the pressure plate 35 on the transmission gear 33. Subsequently, the V-port valve ball 11 can be deflected and adjusted by rotating the handwheel post 34.

[0027] In embodiment four, based on the above embodiments, the limiting assembly further includes an elastic slide plate 4 slidably connected to the inner wall of the upper valve body 2, a T-shaped guide rod 52 moving through the elastic slide plate 4, a hinge rod 41 movably connected between the elastic slide plate 4 and the limiting post 31, and L-shaped guide rods 42 that move and seal through the lower wall of the upper valve body 2 respectively fixedly connected around the elastic slide plate 4. Guide grooves 13 that slide and engage with the corresponding L-shaped guide rods 42 are provided on the front and rear walls of the valve seat 12.

[0028] The guide groove 13 is composed of an outer vertical groove and an outer inclined groove that is inclined towards the V-port valve ball 11 from top to bottom.

[0029] The initial L-shaped guide rod 42 slides and engages with the outer vertical groove in the guide groove 13. The L-shaped guide rod 42 limits the movement of the outer vertical groove, ensuring stable sealing of the valve seat 12 against the V-port valve ball 11. When the valve flow needs adjustment, lifting the handle 5 causes the limiting post 31 to move forward, thereby driving the hinge rod 41 to compress the elastic slide plate 4. The elastic slide plate 4 then causes each L-shaped guide rod 42 to move downwards, pressing against the outer oblique groove in the guide groove 13. The valve seats 12 on both sides are then moved in opposite directions, ensuring that the subsequent rotation of the handwheel post 34 adjusts the deflection of the V-port valve ball 11. The valve seats 12 on both sides can be pre-disengaged from the V-port valve ball 11 to avoid rotational wear and subsequent poor sealing. After the valve flow is adjusted, the control handle 5 is deflected downward to reset. The elastic potential energy of the compressed elastic slide plate 4 can assist the handle 5 to reset. After the handle 5 is reset, the valve seats 12 on both sides are reset synchronously and locked synchronously with the handwheel column 34. The elastic force of the elastic slide plate 4 can cooperate with the squeezing action of the lower vertical groove in the limit groove 32 on the pin 53 to reduce the risk of the handle 5 being lifted under vibration conditions or accidentally by a small bump.

[0030] In Example 5, based on the above examples, the top and bottom peripheries of the T-shaped guide rod 52 are provided with two symmetrical key protrusions, and the upper and lower walls of the inner cavity of the upper valve body 2 are provided with key grooves corresponding to the key protrusions.

[0031] This design avoids the T-shaped guide rod 52 from deflecting when moving up and down, ensuring its stable transmission between the limiting groove 32 and the sliding groove 51. At the same time, when the T-shaped guide rod 52 drives the pin 53 to engage with the top of the limiting groove 32, the top key protrusion 2 is also just limited by the top key groove 2. Thus, when the handle 5 is lifted to unlock the valve, the force between the pin 53 and the limiting groove 32 is reduced, preventing it from being damaged by excessive force.

[0032] In Example 6, based on the above examples, the top of the V-port valve ball 11 has a rectangular opening, and the bottom of the worm gear column 21 has a rectangular block that matches the rectangular opening and has a rounded bottom edge design.

[0033] Both ends of the valve seat 12 are provided with a key protrusion on the side away from the V-port valve ball 11, and the upper and lower walls of the inner cavities on the left and right sides of the lower valve body 1 are provided with key grooves corresponding to the key protrusion.

[0034] The bottom of the upper valve body 2 protrudes in a columnar shape and slides into the upper end of the lower valve body 1. The inner cavity in the middle of the lower valve body 1 is adapted to the bottom of the upper valve body 2. The bottom of the upper valve body 2 has an upper hemispherical groove with a radius larger than that of the V-shaped valve ball 11. The lower wall of the inner cavity in the middle of the lower valve body 1 has a lower hemispherical groove that can form a complete sphere with the upper hemispherical groove. The left and right sides of the bottom of the upper valve body 2 are provided with semi-circular grooves that are adapted to the valve seat 12. The top edge of the guide groove 13 is chamfered.

[0035] During initial valve assembly, first insert the V-port valve ball 11 into the lower hemispherical groove in the middle of the lower valve body 1 with the valve port facing forward and backward. Then, insert the valve seat 12 from both sides of the lower valve body 1 with the outer vertical groove of the guide groove 13 at the top, and abut against the V-port valve ball 11. Then, the upper valve body 2 can be inserted into the lower valve body 1 for installation. Each L-shaped guide rod 42 can automatically engage with the guide groove 13, and the rectangular block at the bottom of the worm gear column 21 can engage with the rectangular opening at the top of the V-port valve ball 11. The top edge chamfer design and the rounded corner design of the bottom edge of the rectangular block at the bottom of the worm gear column 21 allow for slight deviations in the insertion depth of the valve seat 12 and slight deviations when the worm gear column 21 and the V-port valve ball 11 are connected, making installation and maintenance convenient. In addition, after the upper valve body 2 and the lower valve body 1 are adapted and connected, a small gap can be formed between the surface of the V-port valve ball 11 and the inner wall of the upper and lower hemispherical grooves, avoiding friction on the V-port valve ball 11 and facilitating compensation for thermal expansion and contraction of materials.

[0036] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A ball valve with precise flow adjustment, comprising a lower valve body (1) and a V-port valve ball (11) rotatably inserted into the lower wall of its inner cavity, characterized in that, The lower valve body (1) has valve seats (12) that are slidably engaged with the V-port valve ball (11) on both the left and right sides. The upper valve body (2) is adapted to be installed on the upper end of the lower valve body (1). The upper valve body (2) has a worm gear column (21) that is rotatably engaged with the top of the V-port valve ball (11) in the middle. The upper valve body (2) has a worm gear (23) that meshes with the worm gear column (21) rotatably connected to the inner wall of the upper valve body (2). The upper wall of the inner cavity of the upper valve body (2) is provided with a shaft block (3). The front wall of the shaft block (3) is rotatably connected with a transmission gear (33) that meshes with the worm gear (23). The front wall of the upper valve body (2) is provided with a handwheel column (34) that is slidably engaged with the transmission gear (33). The handwheel column (34) has a pressure plate (35) that is movably engaged with the transmission gear (33) and is fixedly sleeved on the handwheel column (34). The bottom of the inner cavity of the upper valve body (2) is provided with a limiting component for locking the handwheel column (34) and the valve seats (12) on both sides. The upper wall of the upper valve body (2) is rotatably connected with a handle (5). The handle (5) is provided with an adjustment component that drives the limiting component to move the valve seats (12) in opposite directions and the handwheel column (34) forward.

2. The ball valve with precise flow adjustment according to claim 1, characterized in that, The upper valve body (2) has two circular arrayed arc grooves on its upper wall. The top of the worm gear column (21) is fixedly connected to an indicator frame (22) that passes through the two arc grooves and is U-shaped. The upper wall of the upper valve body (2) is fixedly connected to a flow indicator disk (24) that is coaxial with the arc grooves. The top two ends of the indicator frame (22) are arc-convex.

3. The ball valve with precise flow adjustment according to claim 2, characterized in that, The top of the V-port valve ball (11) has a rectangular opening, and the bottom of the worm gear column (21) has a rectangular block that is adapted to the rectangular opening and has a rounded bottom edge design.

4. The ball valve with precise flow adjustment according to claim 3, characterized in that, The limiting component includes a limiting post (31) that is slidably engaged between the shaft block (3) and the rear wall of the upper valve body (2). The front end of the limiting post (31) is rotatably connected to the handwheel post (34). The rear end of the pressure plate (35) is provided with an elastic friction surface, which can be, for example, a rubber pad.

5. The ball valve with precise flow adjustment according to claim 4, characterized in that, The limiting assembly also includes an elastic slide plate (4) that is slidably connected to the inner wall of the upper valve body (2). A hinge rod (41) is movably connected between the elastic slide plate (4) and the limiting post (31). An L-shaped guide rod (42) that is movably sealed and passes through the lower wall of the upper valve body (2) is fixedly connected around the elastic slide plate (4). Guide grooves (13) that slide and engage with the corresponding L-shaped guide rods (42) are provided on the front and rear walls of the valve seat (12).

6. A ball valve with precise flow adjustment according to claim 5, characterized in that, The guide groove (13) is composed of an outer vertical groove and an outer inclined groove that is inclined towards the V-mouth valve ball (11) from top to bottom. The top edge of the guide groove (13) is chamfered.

7. A ball valve with precise flow adjustment according to claim 6, characterized in that, The valve seat (12) has a key protrusion on the side away from the V-port valve ball (11) at both ends. The lower valve body (1) has a key groove corresponding to the key protrusion on the upper and lower walls of the inner cavity on both sides.

8. A ball valve with precise flow adjustment according to claim 7, characterized in that, The bottom of the upper valve body (2) protrudes into a column shape and slides into the upper end of the lower valve body (1). The inner cavity of the middle part of the lower valve body (1) is adapted to the bottom of the upper valve body (2). The bottom of the upper valve body (2) has an upper hemispherical groove with a radius greater than that of the V-shaped valve ball (11). The lower wall of the inner cavity of the middle part of the lower valve body (1) has a lower hemispherical groove that can form a complete sphere with the upper hemispherical groove. The left and right sides of the bottom of the upper valve body (2) are provided with semi-circular grooves adapted to the valve seat (12).

9. A ball valve with precise flow adjustment according to claim 8, characterized in that, The adjustment component includes a rectangular groove in the middle of the limiting post (31), and limiting grooves (32) are provided on the left and right walls of the rectangular groove. The limiting grooves (32) are composed of a lower vertical groove, a middle inclined groove and an upper vertical groove connected from front to back and from bottom to top. A T-shaped guide rod (52) is slidably engaged between the upper and lower walls of the upper valve body (2). A pin (53) that is slidably engaged with the limiting groove (32) is fixedly inserted in the middle of the T-shaped guide rod (52). The handle (5) is U-shaped and has a sliding groove (51) running through the front and back of the right side. The top of the T-shaped guide rod (52) is slidably engaged with the sliding groove (51), and the T-shaped guide rod (52) moves through the elastic slide plate (4).

10. A ball valve with precise flow adjustment according to claim 9, characterized in that, The top and bottom periphery of the T-shaped guide rod (52) are provided with two symmetrical key protrusions, and the upper and lower walls of the inner cavity of the upper valve body (2) are provided with key grooves corresponding to the key protrusions.

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