A valve stem structure of a full-welded ball valve

Abstract

The utility model belongs to mechanical engineering technical field, especially point to a kind of valve rod structure of full-welded ball valve;Including valve rod ontology, valve core, the installation cylinder of being sleeved in valve rod ontology, driving assembly and anti-misoperation mechanism. The driving assembly includes the connecting portion of valve rod ontology top, handle portion and the inclined portion of connecting both;The anti-misoperation mechanism contains the locking plate of installation cylinder top, two locking holes on board, the guide rail of inclined portion lower surface, the slider that is slidably matched with guide rail, the plug rod that is extended from slider and the positioning assembly on locking plate;Positioning assembly limits handle portion rotation angle to make plug rod align locking hole, rotating handle portion and sliding slider can be inserted locking hole selectively. The utility model is rotated positioning and sliding locking double action to realize valve rod anti-misoperation.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical engineering technology, and specifically refers to a valve stem structure for a fully welded ball valve. Background Technology

[0002] All-welded ball valves are widely used in long-distance pipelines and pipeline systems in industries such as petroleum, natural gas, and chemicals due to their compact structure, excellent sealing performance, high pressure resistance, and corrosion resistance. They are mainly used to control the flow and cut off of media. The stability of their working state is directly related to the safe operation of the pipeline system, and the valve stem, as the core component that controls the opening and closing of the ball valve, is the key to ensuring its reliable operation.

[0003] However, the stem structure of existing all-welded ball valves has significant shortcomings in preventing misoperation. For example, some stems are positioned only by a simple handle, lacking an effective locking mechanism. Accidental rotation can easily occur due to human touch or vibration, leading to unintended opening and closing of the ball valve and causing safety accidents such as media leakage. Other stems, while equipped with locking devices, have poor structural design, such as poor linkage between locking and operating actions, making them prone to accidental locking or locking failure. This fails to reliably limit unnecessary stem rotation, affecting the normal operation of the pipeline system and potentially causing equipment damage and personal injury due to misoperation, posing serious hidden dangers to industrial production. Utility Model Content

[0004] This invention uses the handle of the drive assembly to move the valve stem, and in conjunction with the locking plate, insert rod and positioning assembly of the anti-misoperation mechanism, the valve stem is prevented from misoperation through rotational positioning and sliding locking, thereby alleviating the problems mentioned in the background art.

[0005] The purpose of this utility model is achieved as follows: a valve stem structure for a fully welded ball valve, including a valve stem body and a valve core, and further comprising:

[0006] The mounting sleeve is fitted around the valve stem body;

[0007] The drive assembly includes a connecting portion sleeved on the top end of the valve stem body, a handle portion for gripping, and an inclined portion connecting the connecting portion and the handle portion;

[0008] The anti-misoperation mechanism includes a locking plate fixed to the top of the mounting cylinder and located below the connecting part, two locking holes opened on the locking plate, a guide rail provided on the lower surface of the inclined part, a slider that slides with the guide rail, a plug extending from the bottom of the slider along the inclined direction of the inclined part, and a positioning component fixed to the locking plate, wherein the positioning component restricts the rotation angle of the handle part so that the plug is aligned with the locking hole.

[0009] The insertion rod can be selectively inserted into the corresponding locking hole by rotating the handle to the position defined by the positioning component and then sliding the slider.

[0010] The present invention is further configured such that a permanent magnet is embedded in the upper end of the guide rail, and a magnetic conductor is embedded in the contact surface of the slider corresponding to the upper end of the guide rail.

[0011] The present invention is further configured such that the two locking holes are arranged at 90° intervals, respectively corresponding to the opening and closing of the valve core.

[0012] The present invention is further configured such that the positioning component includes:

[0013] The positioning plate extends upward from the upper surface of the locking plate;

[0014] A positioning port extends horizontally through the positioning plate, with the two ends of the positioning port in the horizontal direction serving as positioning ends, and the handle rotating between the positioning ends;

[0015] When the handle abuts against any positioning end, the insertion rod aligns with the corresponding locking hole.

[0016] The present invention is further provided that the surface of the insertion rod is provided with a fluorescent coating.

[0017] The present invention is further provided that the surface of the handle portion is provided with anti-slip texture.

[0018] The present invention is further provided with a guide slope at the entrance of the locking hole.

[0019] The present invention is further configured such that a drive plate is fixed on the top of the slider, and the drive plate extends to the outside of the inclined portion for manual operation.

[0020] By adopting the above technical solution, the beneficial effects that this utility model can achieve are:

[0021] 1. Through the dual action design of rotating the handle and sliding the slider, combined with the positioning component to limit the rotation angle, the insertion rod is driven to accurately align with the locking hole. This forces the operator to complete the actions in sequence to lock or unlock, avoiding unexpected operations caused by accidental touch or vibration, and improving the safety of valve operation.

[0022] 2. By cooperating with the positioning plate of the positioning component and the positioning port, the rotation range of the handle is limited to 90°, which drives the insertion rod to accurately align with the locking hole, ensuring the accuracy of valve state switching and avoiding problems such as poor sealing or media leakage caused by positioning deviation.

[0023] 3. By attracting the permanent magnet at the upper end of the guide rail to the magnetic conductor of the slider, the slider is stably held at the end of the guide rail in the unlocked state, reducing the need for additional fixing steps by the operator; the drive plate extends to the outside of the inclined part, providing a more convenient manual operation position and optimizing the operation process. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural schematic diagram of the present invention;

[0025] Figure 2 This is a three-dimensional structural schematic diagram of the present invention;

[0026] Figure 3 This is an exploded view of the present invention;

[0027] Figure 4 This is a schematic diagram of the operation of this utility model.

[0028] The reference numerals in the figure are as follows: 1. Valve stem body; 2. Valve core; 3. Mounting cylinder; 4. Drive assembly; 40. Connecting part; 41. Handle part; 42. Inclined part; 5. Anti-misoperation mechanism; 50. Locking plate; 51. Locking hole; 52. Guide rail; 53. Slider; 54. Insert rod; 55. Positioning assembly; 550. Positioning plate; 551. Positioning port; 6. Permanent magnet; 7. Magnetic conductor; 8. Positioning end; 9. Drive plate. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-4 :

[0030] Example 1:

[0031] This embodiment provides a stem structure for a fully welded ball valve, including a stem body 1 and a valve core 2, and further comprising:

[0032] Mounting sleeve 3 is fitted around the valve stem body 1;

[0033] The drive assembly 4 includes a connecting part 40 sleeved on the top end of the valve stem body 1, a handle part 41 for gripping, and an inclined part 42 connecting the connecting part 40 and the handle part 41.

[0034] The anti-misoperation mechanism 5 includes a locking plate 50 fixed to the top of the mounting cylinder 3 and located below the connecting part 40, two locking holes 51 opened on the locking plate 50, a guide rail 52 provided on the lower surface of the inclined part 42, a slider 53 that slides with the guide rail 52, a plug rod 54 extending from the bottom of the slider 53 along the inclined direction of the inclined part 42, and a positioning component 55 fixed to the locking plate 50. The positioning component 55 restricts the rotation angle of the handle part 41 so that the plug rod 54 is aligned with the locking hole 51.

[0035] The insertion rod 54 can be selectively inserted into the corresponding locking hole 51 by rotating the handle part 41 to the position defined by the positioning component 55 and then sliding the slider 53.

[0036] The mounting sleeve 3 serves as the external support structure for the valve stem body 1, providing a stable mounting base, protecting the valve stem from external environmental interference, and providing a fixed position for the locking plate 50. The mounting sleeve 3 is typically a cylindrical sleeve with a clearance fit between its inner wall and the outer circumferential surface of the valve stem body 1. The outer wall may be fitted with a flange or threaded interface for connection to the valve body. The mounting sleeve 3 can be welded or bolted to the valve body for a sealed connection, ensuring that the mounting sleeve 3 remains fixed when the valve stem rotates.

[0037] The drive assembly 4 is used to transmit the manual force of the operator to the valve stem body 1, which drives the valve core 2 to rotate and realize the opening and closing of the valve.

[0038] The connecting part 40 serves as the connection hub between the drive assembly 4 and the valve stem body 1, ensuring that torque is effectively transmitted from the handle part 41 to the valve stem body 1, driving the valve core 2 to rotate. The connecting part 40 is generally a plate-like structure, sleeved on the top of the valve stem body 1, and can be circumferentially fixed to the top of the valve stem body 1 by key connection or interference fit, ensuring synchronous rotation with the valve stem. The outer wall is integrally formed or welded to the inclined part 42.

[0039] The inclined portion 42 connects the connecting portion 40 and the handle portion 41, forming a force transmission path at a specific angle, and simultaneously provides a mounting surface for the guide rail 52 of the anti-misoperation mechanism 5. The inclined portion 42 has an inclined plate-like or rod-like structure, forming an angle with the axis of the connecting portion 40. One end of the inclined portion 42 is connected to the outer wall of the connecting portion 40, and the other end extends away from the valve stem axis and is connected to the handle portion 41, with the entire portion located on one side of the top of the valve stem.

[0040] The handle 41 provides the operator with a gripping and force-applying part, allowing the valve to be opened and closed by manually rotating the handle 41. The handle 41 is typically a rod-shaped structure located at the end of the inclined portion 42, away from the valve stem axis, forming a lever arm to allow the operator to apply a small force to obtain a large torque. The handle 41 is integrally formed with the inclined portion 42 or fixedly connected by bolts, welding, or other methods to ensure structural rigidity.

[0041] The anti-misoperation mechanism 5 is used to limit unauthorized rotation of the valve stem, ensuring that the valve changes state only when the operator actively and correctly operates it, thus preventing safety accidents caused by misoperation.

[0042] The locking plate 50 serves as a fixed reference component to prevent misoperation, providing the installation position for the locking hole 51 and supporting the positioning assembly 55, while limiting the rotation range of the handle part 41. The locking plate 50 is typically a disc-shaped or rectangular metal plate, horizontally fixed to the top of the mounting cylinder 3, located below the connecting part 40, and coaxial with the valve stem body 1, ensuring its position corresponds to that of the insertion rod 54 and the positioning assembly 55. The locking plate 50 can be secured to the top of the mounting cylinder 3 by bolts or welding, ensuring no relative displacement between it and the mounting cylinder 3.

[0043] The guide rail 52 provides a directional sliding path for the slider 53, guiding the insertion rod 54 to move precisely along the tilt direction of the inclined portion 42, ensuring that the insertion rod 54 can be aligned with the locking hole 51 and inserted. The guide rail 52 is generally a long strip-shaped groove or convex rail, with a rectangular or dovetail cross-section and a smooth interior to reduce the sliding resistance of the slider 53. The guide rail 52 is located on the lower surface of the inclined portion 42, extending along the tilt direction of the inclined portion 42, with its lower end close to the locking plate 50 and its upper end extending towards the handle portion 41. The guide rail 52 can be fixed to the lower surface of the inclined portion 42 by bolts, adhesive, or integral molding, ensuring no relative displacement with the inclined portion 42.

[0044] The slider 53 slides on the guide rail 52, causing the insertion rod 54 to move closer to or away from the locking plate 50, thus enabling the insertion rod 54 to be inserted into or disengaged from the locking hole 51. The slider 53 is generally a block-shaped structure that matches the cross-section of the guide rail 52. The slider 53 is embedded in the guide rail 52 and can slide freely along the guide rail 52. In the locked state, it slides to the lower end of the guide rail 52.

[0045] The insert rod 54, acting as a locking actuator, restricts valve stem rotation when inserted into the locking hole 51 and releases the lock when disengaged, making it a core component for preventing misoperation. The insert rod 54 is generally a cylindrical or rectangular rod structure, with its lower end fitting into the locking hole 51 for smooth insertion. The insert rod 54 extends vertically downwards from the bottom of the slider 53, arranged along the inclined direction of the inclined portion 42, and its length is adapted to the sliding stroke of the slider 53, ensuring complete insertion into the locking hole 51 when sliding to the lower end. The insert rod 54 can be integrally formed, welded, or threadedly connected to the bottom of the slider 53, ensuring synchronous movement without relative displacement during sliding.

[0046] The positioning component 55 is used to limit the rotation angle of the handle part 41, ensuring that the handle part 41 can only rotate within the range of "open" and "closed" of the corresponding valve core 2, so that the insert rod 54 is precisely aligned with the locking hole 51.

[0047] In this embodiment, when the fully welded ball valve needs to be operated, the operator holds the handle 41 of the drive assembly 4 and drives the valve stem body 1 and valve core 2 to rotate through the tilting part 42 and the connecting part 40. At this time, the positioning component 55 of the anti-misoperation mechanism 5 restricts the rotation angle of the handle 41, so that the valve core 2 can only switch between the corresponding open and closed positions. When the handle 41 is rotated to the position limited by the positioning component 55, the slider 53 on the guide rail 52 on the lower surface of the tilting part 42 drives the insertion rod 54 to align with the locking hole 51 on the locking plate 50. Sliding the slider 53 causes the insertion rod 54 to be inserted into the locking hole 51, which can fix the valve stem body 1 and prevent it from rotating accidentally. Sliding the slider 53 in the opposite direction causes the insertion rod 54 to disengage from the locking hole 51, and the handle 41 can be rotated again to switch the state of the valve core 2.

[0048] Example 2:

[0049] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0050] A permanent magnet 6 is embedded in the upper end of the guide rail 52, and a magnetic conductor 7 is embedded in the contact surface of the slider 53 corresponding to the upper end of the guide rail 52.

[0051] In this embodiment, a permanent magnet 6 is embedded in the upper end of the guide rail 52, and a magnetic conductor 7 is embedded in the corresponding contact surface of the slider 53, thereby achieving stable stopping of the slider 53 by magnetic attraction. The permanent magnet 6 is generally a small block, usually rectangular or circular, and can be fixed in the groove at the upper end of the guide rail 52 by embedding or gluing. The magnetic conductor 7 is a small block of metal that matches the shape of the permanent magnet 6, and can also be embedded or glued into the corresponding position on the contact surface of the slider 53. When the slider 53 slides to the upper end of the guide rail 52 in the unlocked state, the permanent magnet 6 and the magnetic conductor 7 attract each other, firmly restricting the slider 53 to the upper end of the guide rail 52. This prevents it from sliding down the guide rail 52 due to vibration, tilting, or accidental contact, ensures that the insertion rod 54 will not be accidentally inserted into the locking hole 51 in the non-operating state, and provides a clear initial position for the slider 53 to reset during the next operation, improving the reliability and ease of operation of the anti-misoperation mechanism 5.

[0052] Example 3:

[0053] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0054] The two locking holes 51 are arranged at 90° intervals, corresponding to the opening and closing of the valve core 2, respectively.

[0055] In this embodiment, by arranging the two locking holes 51 at 90° intervals, they precisely correspond to the open and closed positions of the valve core 2. When the handle 41 rotates 90° under the restriction of the positioning component 55, it drives the insert rod 54 to switch between the two locking holes 51, ensuring that the valve core 2 can only be locked in the two working states of fully open or fully closed. This arrangement is not only compatible with the working characteristic of the ball valve core 2 rotating 90°, but also achieves clear distinction of the state of the valve core 2 through the clear angular interval, avoiding the valve core 2 being in a half-open or half-closed state due to ambiguous locking position, thereby ensuring the completeness of medium flow or cut-off and reducing the safety hazards of the pipeline system caused by uncertain state.

[0056] Example 4:

[0057] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0058] The positioning component 55 includes:

[0059] Positioning plate 550 extends upward from the upper surface of locking plate 50;

[0060] The positioning port 551 extends horizontally through the positioning plate 550, and the two ends of the positioning port 551 in the horizontal direction are positioning ends 8. The handle part 41 rotates between the positioning ends 8.

[0061] When the handle portion 41 abuts against any positioning end 8, the insertion rod 54 aligns with the corresponding locking hole 51.

[0062] The positioning plate 550 serves as the mounting carrier for the positioning port 551, providing structural support to ensure that the positioning port 551 stably restricts the rotation range of the handle portion 41. It also connects the locking plate 50 and the positioning port 551, forming a rigid constraint structure. The positioning plate 550 is generally plate-shaped and can extend upwards perpendicular to the surface of the locking plate 50. It is generally rectangular or trapezoidal, with rounded edges to prevent hand injuries during operation. The positioning plate 550 can be fixed to the upper surface of the locking plate 50 by welding or bolting. Near the edge, it maintains a certain distance from the valve stem body 1 to prevent interference with the rotation of the connecting portion 40, and is aligned with the rotation trajectory of the handle portion 41 to ensure that the handle portion 41 can pass through the positioning port 551 when rotating.

[0063] The positioning port 551 directly contacts the handle part 41. The positioning ends 8 at both ends limit the rotation limit of the handle part 41, ensuring that the handle part 41 can only rotate within a preset angle, thereby ensuring that the valve core 2 only switches between the "open" and "closed" positions. The positioning port 551 is a horizontal through-hole penetrating the positioning plate 550, and its shape is mostly rectangular or arc-shaped. Rectangular through-holes are suitable for rod-shaped handle parts 41, while arc-shaped through-holes are suitable for cylindrical handle parts 41, ensuring contact stability. The two horizontal ends of the positioning port 551 are positioning ends 8, which are flat to ensure stable contact with the handle part 41.

[0064] In this embodiment, when the operator rotates the handle 41, the handle 41 passes into the positioning port 551 of the positioning plate 550 and moves along the length of the positioning port 551. When the handle 41 rotates to one of the positioning ends 8 of the positioning port 551, it is blocked by the positioning end 8 and cannot continue to rotate. At this time, the valve core 2 is in the "closed" state, and the insertion rod 54 is aligned with the corresponding locking hole 51. Rotating the handle 41 in the opposite direction until it contacts the other positioning end 8 of the positioning port 551, the handle 41 is blocked again. At this time, the valve core 2 is in the "open" state, and the insertion rod 54 is aligned with the other locking hole 51. Through the rigid constraint of the positioning end 8, the rotation range of the handle 41 is strictly limited to the two positioning ends 8, ensuring that the valve core 2 can only switch between the two preset positions of "open" and "closed", providing mechanical guarantee for the precise alignment of the insertion rod 54 and the locking hole 51.

[0065] Example 5:

[0066] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0067] The surface of the insertion rod 54 is coated with a fluorescent coating.

[0068] In this embodiment, by coating the surface of the insertion rod 54 with a fluorescent coating, it continuously emits visible fluorescence in the absence of light, allowing for rapid visual identification of the valve's locked state and preventing damage from forced operation due to misjudgment. The fluorescent coating can be applied evenly to the outer surface of the insertion rod 54 by brushing or spraying. After the coating dries and cures, it forms a thin film that absorbs and stores ambient light in low-light or dark environments, subsequently emitting fluorescence autonomously. This design allows operators to quickly identify whether the insertion rod 54 is inserted into the locking hole 51, clearly determining the valve's locked state and avoiding misoperation due to obstructed vision. It is particularly suitable for industrial scenarios with poor lighting conditions, such as at night, underground pipelines, or enclosed spaces, effectively improving operational accuracy and safety.

[0069] Example 6:

[0070] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0071] The surface of the handle portion 41 is provided with anti-slip texture.

[0072] In this embodiment, by providing anti-slip textures on the surface of the handle portion 41, the friction force when the operator grips the handle is enhanced, preventing hand slippage that could affect operational accuracy or lead to accidents. The anti-slip textures are typically manufactured using machining or molding. Specifically, axially distributed strip grooves, grid-like raised patterns, or diagonally interlaced patterns can be machined onto the outer circumferential surface of the handle portion 41, forming an integral structure with the surface of the handle portion 41. This does not increase the thickness of the component, and the uneven surface increases the contact friction between the hand and the handle portion 41. This design is particularly effective in situations where hands are wet, oily, or when operating with gloves, ensuring effective control of the rotational motion and preventing deviations in the rotation angle of the handle portion 41 due to slippage. This, in turn, ensures the accuracy of valve core 2 state switching and operational safety.

[0073] Example 7:

[0074] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0075] The entrance of the locking hole 51 is provided with a guide slope.

[0076] In this embodiment, by providing a guide slope at the entrance of the locking hole 51, the alignment accuracy requirement between the insertion rod 54 and the locking hole 51 is reduced. The guide slope enables a self-correcting function, allowing smooth insertion even with minor positional deviations, thus avoiding locking failures caused by assembly tolerances or component deformation. The guide slope is formed through machining. Specifically, at the edge of the entrance of the locking hole 51, the right-angled edge, originally perpendicular to the hole wall, is cut into an inclined plane, causing the slope to gradually expand outward from the entrance of the locking hole 51, forming a funnel-shaped transition structure. When the insertion rod 54 needs to be inserted into the locking hole 51, even if there is a slight positional deviation between the insertion rod 54 and the locking hole 51, the guide slope can guide the end of the insertion rod 54 through its inclination angle, smoothly guiding the insertion rod 54 into the hole. This avoids the insertion rod 54 getting stuck or unable to be inserted due to alignment errors, thereby ensuring the rapid completion of the locking action, reducing operation time, and simultaneously reducing wear caused by hard collisions between the insertion rod 54 and the edge of the locking hole 51, extending the service life of the component.

[0077] Example 8:

[0078] This embodiment provides a stem structure for a fully welded ball valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0079] The top of the slider 53 is fixed with a drive plate 9, which extends to the outside of the inclined portion 42 for manual operation.

[0080] In this embodiment, by fixing the drive plate 9 to the top of the slider 53 and extending it to the outside of the inclined portion 42, the ease of sliding operation of the slider 53 is improved. The drive plate 9 is typically a thin strip, with one end fixedly connected to the top of the slider 53 by welding or bolting, and the other end extending outward along the inclined direction of the inclined portion 42 to the outside of the inclined portion 42, forming an operating end that facilitates hand application of force. The operator can directly contact the drive plate 9 without having to go under the inclined portion 42, and by pushing or pulling the drive plate 9, the slider 53 is driven to slide along the guide rail 52. Compared to directly operating the slider 53, the drive plate 9 increases the contact area between the hand and the operating component, making the sliding action more effortless and controllable. Especially when the gap between the inclined portion 42 and other components is small, it can avoid the risk of hand injury, while ensuring the accurate sliding stroke of the slider 53, further improving the safety and operational efficiency of the anti-misoperation mechanism 5.

[0081] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A stem structure for a fully welded ball valve, comprising a stem body (1) and a valve core (2), characterized in that, Also includes: The mounting sleeve (3) is fitted around the valve stem body (1); The drive assembly (4) includes a connecting part (40) sleeved on the top of the valve stem body (1), a handle part (41) for gripping, and an inclined part (42) connecting the connecting part (40) and the handle part (41). The anti-misoperation mechanism (5) includes a locking plate (50) fixed to the top of the mounting cylinder (3) and located below the connecting part (40), two locking holes (51) opened on the locking plate (50), a guide rail (52) provided on the lower surface of the inclined part (42), a slider (53) that slides with the guide rail (52), a plug rod (54) extending from the bottom of the slider (53) along the inclined direction of the inclined part (42), and a positioning component (55) fixed to the locking plate (50). The positioning component (55) restricts the rotation angle of the handle part (41) so that the plug rod (54) is aligned with the locking hole (51). The insertion rod (54) can be selectively inserted into the corresponding locking hole (51) by rotating the handle part (41) to the position defined by the positioning component (55) and then sliding the slider (53).

2. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The upper end of the guide rail (52) is provided with a permanent magnet (6), and the contact surface of the slider (53) corresponding to the upper end of the guide rail (52) is provided with a magnetic conductor (7).

3. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The two locking holes (51) are arranged at 90° intervals, respectively corresponding to the opening and closing of the valve core (2).

4. The stem structure of a fully welded ball valve according to claim 1 or 3, characterized in that, The positioning component (55) includes: Positioning plate (550) extends upward from the upper surface of locking plate (50); The positioning port (551) extends horizontally through the positioning plate (550), and the two ends of the positioning port (551) in the horizontal direction are positioning ends (8). The handle part (41) rotates between the positioning ends (8). When the handle (41) abuts against any positioning end (8), the insertion rod (54) aligns with the corresponding locking hole (51).

5. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The surface of the insertion rod (54) is coated with a fluorescent coating.

6. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The surface of the handle (41) is provided with anti-slip texture.

7. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The entrance of the locking hole (51) is provided with a guide slope.

8. The stem structure of a fully welded ball valve according to claim 1, characterized in that, The top of the slider (53) is fixed with a drive plate (9), which extends to the outside of the inclined part (42) for manual operation.

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