Sealing ball valve

Abstract

The invention relates to the field of ball valves, in particular to a sealing ball valve which comprises a ball valve assembly, a valve body assembly is arranged on the ball valve assembly, and the valve body assembly is matched with the ball valve assembly to convey and block flowing of fluid; a plugging assembly is installed on the ball valve assembly and used for plugging the leaked ball valve assembly. The plugging assembly can plug the ball valve assembly; when liquid leaks, the plugging assembly is extruded, the plugging assembly is pressed to seal the joint of the ball valve assembly, and a warning signal is released to the outside, so that a worker can conveniently perceive that the interior of the ball valve is abnormal; when high temperature occurs near the ball valve assembly, the internal sealing performance of the ball valve assembly becomes poor, at the moment, the plugging assembly expands, the plugging assembly is subjected to expansion force to seal the connecting position of the ball valve assembly, meanwhile, a warning signal is released to the outside, and the ball valve assembly is overhauled or replaced in time.

Description

Technical Field

[0001] The invention relates to the field of ball valves, in particular to a sealing ball valve. Background Art

[0002] In the field of fluid control, ball valves are commonly used as flow cutoff and control devices, and are widely used in many industries such as petroleum, chemical, and natural gas. With the continuous development of industrial production, the requirements for ball valve performance and maintenance costs are also increasing.

[0003] Currently, conventional ball valves have several significant drawbacks in practical use. First, leakage is difficult to detect promptly. By the time leakage is discovered, severe and irreversible damage has already occurred, posing a significant risk to the stable operation of related equipment and systems. Second, the sealing gasket inside the ball valve is prone to deformation under high-temperature conditions. Especially in fire environments, the gasket can even melt, causing the ball valve to completely lose its sealing performance and triggering large-scale leakage of the medium.

[0004] Given that ball valves are often used to transport flammable and explosive gases or liquids, the stability of their sealing performance is a significant safety issue. Developing a ball valve that can maintain a good seal even under extreme conditions such as high temperatures and fire would undoubtedly have significant practical significance and application value. Based on this, the present invention proposes a sealed ball valve designed to effectively address this issue. Summary of the Invention

[0005] In view of the problems in the prior art, the present invention provides a sealing ball valve.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a sealed ball valve, including a ball valve assembly, on which a valve body assembly is provided, and the valve body assembly cooperates with the ball valve assembly to convey and block the flow of fluid; a blocking assembly is installed on the ball valve assembly, and the blocking assembly is used to block the leaking ball valve assembly.

[0007] It also includes an adjusting component, which is used to drive the ball valve component to rotate so as to open and close the ball valve component and the valve body component; The regulating assembly includes a sealing gasket arranged inside the ball valve assembly, a plugging assembly is installed on the sealing gasket; a sealing ring is installed on the plugging assembly, a bracket is provided on the sealing ring, a pressure cover is provided on the bracket, and the pressure cover is used to compress the sealing ring; a transmission rod is provided inside the bracket, the end of the transmission rod passes through the interior of the sealing ring, the plugging assembly and the sealing gasket, and extends to the interior of the ball valve assembly; the rotation of the transmission rod drives the ball valve assembly to rotate.

[0008] The blocking assembly includes a blocking unit and an expansion unit; the blocking unit is used to seal the transmission rod and the ball valve assembly; the expansion unit is used to push the blocking unit to move and fit on the outer wall of the transmission rod; The expansion and contraction unit includes a sealing ring arranged on a sealing gasket, an expansion plate arranged inside the sealing ring, an annular inner chamber formed between the sealing ring and the expansion plate, and the interior of the inner chamber is used to store an expansion agent; a warning member is arranged inside the inner chamber, and the warning member is used for early warning; when the expansion agent expands, the warning member moves outward, and the sealing unit seals the connection between the transmission rod and the ball valve assembly.

[0009] The warning member includes an elastic member arranged inside the inner chamber, a push block is provided on the elastic member, a warning rod is provided on the push block, one end of the warning rod passes through the interior of the elastic member and extends outward, the elastic member is used to push the elastic member to reset, one end of the elastic member is sealed connected to the inner wall of the inner chamber, and the other end is sealed connected to the push block.

[0010] The blocking unit includes a movable block arranged inside the blocking ring, and the movable block slides up and down inside the blocking ring; a plurality of through holes are provided inside the blocking ring, an inwardly protruding extrusion block is provided on the circumferential inner wall of the blocking ring, and a stop block is provided on the inner wall of the blocking ring, and the extrusion block and the stop block are squeezed with each other. Preferably, a sliding groove is provided on the movable block, a slider is provided on the inside of the blocking ring, and the groove slides along the slider. Preferably, a downward-facing hollow protrusion in the shape of an inverted truncated cone is provided at the bottom of the through hole, and the protrusion is made of a flexible material, such as aluminum.

[0011] The sealing ring is annular in structure. At least one sealing block is provided on the outer wall of the inner circumference of the sealing ring. The sealing block is annular in structure. When the sealing block is squeezed, the sealing block fits with the transmission rod.

[0012] The blocking unit further comprises a sealing ring arranged on the inner circumferential wall of the blocking ring, and the sealing ring is in a transverse W-shaped structure. When the inner chamber is squeezed, the sealing ring blocks the outer wall of the transmission rod.

[0013] The ball valve assembly includes a main valve body connected to the valve body assembly. A ball is provided inside the main valve body, and the ball rotates inside the main valve body.

[0014] The valve body assembly includes a side valve body connected to both sides of the main valve body, and a graphite gasket, an O-ring, a front valve seat and a rear valve seat are installed inside the side valve body. There are two graphite gaskets, the front valve seat is located on one side of the rear valve seat, a graphite gasket is arranged between the front valve seat and the rear valve seat, a graphite gasket is arranged between the ball and the front valve seat, and a disc spring is arranged between the side valve body and the rear valve seat.

[0015] An end cover is provided at the bottom of the main valve body, and the end cover is connected to the main valve body by bolts; an actuator is provided on the top of the bracket, and the actuator is used to drive the transmission rod to rotate.

[0016] Beneficial effects: The ball valve assembly can be sealed by the provided sealing component; when leakage occurs, the sealing component is squeezed, and the sealing component is subjected to pressure to seal the connection of the ball valve assembly, and by releasing a warning signal to the outside world, it is convenient for staff to detect abnormalities inside the ball valve; when high temperature causes the internal sealing of the ball valve assembly to deteriorate, the sealing component expands, and the sealing component is subjected to the expansion force to seal the connection of the ball valve assembly, and at the same time releases a warning signal to the outside world, so that the ball valve assembly can be inspected or replaced in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings and examples.

[0018] Figure 1 A schematic diagram of the overall structure provided by the present invention; Figure 2 It is an exploded view of the overall structure of the present invention; Figure 3 Schematic diagram of the internal connection of the present invention; Figure 4 for Figure 3 A in the figure shows the enlarged structural diagram; Figure 5 for Figure 3 A schematic diagram of the structure at point B in FIG. Figure 6 It is a structural schematic diagram of the blocking component of the present invention.

[0019] In the figure: 1. actuator; 2. adjusting assembly; 21. pressure cover; 22. bracket; 23. transmission rod; 24. sealing ring; 25. sealing gasket; 3. ball valve assembly; 31. main valve body; 32. ball; 4. valve body assembly; 41. side valve body; 42. front valve seat; 43. rear valve seat; 44. disc spring; 45. graphite gasket; 46. O-ring; 5. end cover; 6. sealing assembly; 61. sealing ring; 62. warning rod; 63. elastic part; 64. push block; 65. expansion plate; 66. movable block; 67. through hole; 68. extrusion block; 69. stop block; 610. sealing block; 601. inner chamber; 602. sealing ring. DETAILED DESCRIPTION

[0020] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0021] In one embodiment, please refer to the appendix of the specification. Figure 1-6 As shown, a sealed ball valve described in the present invention includes a ball valve assembly 3, on which a valve body assembly 4 is provided, and the valve body assembly 4 cooperates with the ball valve assembly 3 to transport and block the flow of fluid; a blocking assembly 6 is installed on the ball valve assembly 3, and the blocking assembly 6 is used to block the leaking ball valve assembly 3.

[0022] In order to ensure that the sealing conditions are poor when leakage and high temperature occur, the ball valve assembly 3 can be sealed by the provided sealing component 6; when leakage occurs, the sealing component 6 is squeezed, and the sealing component 6 is subjected to pressure to seal the connection of the ball valve assembly 3, and by releasing a warning signal to the outside world, it is convenient for the staff to detect abnormalities inside the ball valve; when high temperature appears near the ball valve assembly 3, the internal sealing of the ball valve assembly 3 becomes worse. At this time, the sealing component 6 expands, and the sealing component 6 is subjected to the expansion force to seal the connection of the ball valve assembly 3, and at the same time releases a warning signal to the outside world, so that the ball valve assembly 3 can be inspected or replaced in time.

[0023] In one embodiment, please refer to the attached instructions. Figure 1-3 As shown, it also includes an adjusting component 2, which is used to drive the ball valve component 3 to rotate, so that the ball valve component 3 and the valve body component 4 are opened and closed; The regulating assembly 2 includes a sealing gasket 25 arranged inside the ball valve assembly 3, and a plugging assembly 6 is installed on the sealing gasket 25; a sealing ring 24 is installed on the plugging assembly 6, and a bracket 22 is provided on the sealing ring 24, and a pressure cover 21 is provided on the bracket 22, and the pressure cover 21 is used to compress the sealing ring 24; a transmission rod 23 is provided inside the bracket 22, and the end of the transmission rod 23 passes through the interior of the sealing ring 24, the plugging assembly 6 and the sealing gasket 25, and extends to the interior of the ball valve assembly 3; the rotation of the transmission rod 23 drives the ball valve assembly 3 to rotate.

[0024] A bearing is sleeved on the transmission rod 23, and the bearing is connected to the ball valve assembly 3. The sealing gasket 25 is located above the bearing to seal the bearing to prevent liquid from leaking from the connection between the bearing and the transmission rod 23; the sealing assembly 6 is capable of expanding when heated to squeeze and seal the sealing gasket 25, and the sealing assembly 6 also seals the transmission rod 23 at the same time.

[0025] In another embodiment, please refer to the attached Figure 2-4 As shown in Figure 6, the blocking assembly 6 includes a blocking unit and an expansion unit; the blocking unit is used to seal the transmission rod 23 and the ball valve assembly 3; the expansion unit is used to push the blocking unit to move and fit on the outer wall of the transmission rod 23; The expansion and contraction unit includes a sealing ring 61 arranged on the sealing gasket 25, an expansion piece 65 is arranged inside the sealing ring 61, and an annular inner chamber 601 is formed between the sealing ring 61 and the expansion piece 65. The interior of the inner chamber 601 is used to store the expansion agent; the interior of the inner chamber 601 is provided with a warning member, and the warning member is used for early warning; when the expansion agent expands, the warning member moves outward, and the sealing unit seals the connection between the transmission rod 23 and the ball valve assembly 3.

[0026] In order to allow the blocking assembly 6 to be subjected to the ball valve assembly 3 internal liquid exudation when squeezing, the connection between the transmission rod 23 and the ball valve assembly 3 is sealed, and the sealing pad 25 that can be deformed or melted in a hot environment can be squeezed simultaneously, and the connection between the transmission rod 23 and the ball valve assembly 3 is sealed, and the inner chamber 601 provided with can be filled with expansion agent in its inside, and further expansion agent can be selected propyl carbinol for use, and its boiling point is 117.7 ℃, and in the time of 100 ℃, there will be obvious vaporization phenomenon. The chemical property of propyl carbinol is relatively stable, and is better with the compatibility of some rubber sealing ring materials. Its heat of vaporization is moderate, and can meet the performance requirements of the expansion chamber to vaporized liquid to a certain extent. The melting point range of the sealing material made of rubber material is generally 150°C-300°C; before the sealing material is deformed and easily leaks the liquid inside the ball valve assembly 3, the expansion agent inside the inner chamber 601 will be vaporized first, and then the vaporized expansion agent squeezes the warning member to move, and the warning member generates an early warning; at the same time, the blocking unit seals the connection between the transmission rod 23 and the ball valve assembly 3; if only liquid seepage occurs inside the ball valve assembly 3, the liquid will be squeezed onto the expansion piece 65 through the blocking unit, and the expansion piece 65 is a folded metal structure; the pressure of the liquid will squeeze the expansion agent inside the inner chamber 601, and the expansion agent will be squeezed by the pressure to squeeze the blocking unit, and the blocking unit will be squeezed on the outer wall of the transmission rod 23 to achieve blocking; and the warning member moves outward to achieve the purpose of warning.

[0027] Furthermore, the warning member includes an elastic member 63 arranged inside the inner chamber 601, a push block 64 is provided on the elastic member 63, and a warning rod 62 is provided on the push block 64. One end of the warning rod 62 passes through the interior of the elastic member 63 and extends outward. The elastic member 63 is used to push the elastic member 63 to reset. One end of the elastic member 63 is sealed and connected to the inner wall of the inner chamber 601, and the other end is sealed and connected to the push block 64.

[0028] In order to be able to transmit the signal to the outside world when the internal pressure of the inner chamber 601 changes, the elastic member 63 can be selected to have the largest diameter suitable for the interior of the cavity; the elastic member 63 is preferably a sealed multiple ring-mounted hollow metal structure connected in the first position, and the two ends of the elastic member 63 are sealed and connected respectively. When the pressure inside the inner chamber 601 increases, the push block 64 pushes the warning rod 62 to move out of the outside of the ball valve assembly 3. The end of the warning rod 62 can be painted in a bright color to facilitate detection in a short time. Preferably, a trigger alarm can be connected to the end of the warning rod 62. When the warning rod 62 moves, the alarm sounds an alarm to remind the staff that there is an abnormality in the ball valve assembly 3 here, which is convenient for maintenance.

[0029] Furthermore, the blocking unit includes a movable block 66 disposed inside the blocking ring 61, and the movable block 66 slides up and down inside the blocking ring 61; a plurality of through holes 67 are provided inside the blocking ring 61, and an inwardly protruding extrusion block 68 is provided on the circumferential inner wall of the blocking ring 61, and a stopper 69 is provided on the inner wall of the blocking ring 61, and the extrusion block 68 and the stopper 69 are squeezed against each other. Preferably, a sliding groove is provided on the movable block 66, and a slider is provided inside the blocking ring 61, and the groove slides along the slider. Preferably, a downward-facing hollow protrusion in the shape of an inverted truncated cone is provided at the bottom of the through hole 67, and the protrusion is made of a flexible material, which can be made of aluminum.

[0030] When the ball valve assembly 3 is affected by high temperature, the sealing performance of the sealing gasket 25 on the ball valve deteriorates. If in the event of a fire, the sealing gasket 25 may even melt, which will cause the seal made of rubber material between the ball valve assembly 3 and the transmission shaft to lose its sealing performance, causing the liquid inside the ball valve assembly 3 to overflow. If the liquid is flammable and explosive, the use environment will become more severe and dangerous. When high temperature occurs, the expansion agent inside the inner chamber 601 is vaporized, causing the inner chamber 601 to push the expansion piece 65 downward to move. The expansion piece 65 squeezes the movable block 66 downward. During the downward movement of the movable block 66, the protrusion at the bottom is squeezed on the sealing gasket 25 to make up for the thickness of the melted or deformed sealing gasket 25. At the same time, the squeezing block 68 is squeezed on the stopper 69 during its downward movement. The stopper 69 is squeezed outward to drive the inner wall of the sealing ring 61 to move outward and fit the outer circumference of the transmission rod 23, thereby achieving a sealing effect. In order to enable the sealing assembly 6 to work normally at high temperatures, preferably, the structure of the sealing assembly 6 is made of metal material. The provided slider and the slide groove can provide guidance for the sliding of the movable block 66, making the movement of the movable block 66 smoother and more fluent.

[0031] Furthermore, the sealing ring 61 has an annular structure, and at least one sealing block 610 is provided on the inner circumferential outer wall of the sealing ring 61. The sealing block 610 has an annular structure. When the sealing block 610 is squeezed, the sealing block 610 fits against the transmission rod 23.

[0032] In order to achieve a better sealing effect between the inner circumferential outer wall of the sealing ring 61 and the transmission rod 23 when the extrusion block 68 is squeezed on the stop block 69, it is preferred that an outwardly protruding sealing block 610 is provided above and below the stop block 69. When the movable block 66 does not move downward, the sealing block 610 just contacts the outer wall of the transmission rod 23 and does not generate friction with the rotating transmission rod 23; when the movable block 66 moves downward, it drives the extrusion block 68 to squeeze the stop block 69 to move, and the stop block 69 is squeezed on the sealing ring 61, so that the stop block 69 deforms the outer wall of the sealing ring 61, and the two sealing blocks 610 are abutted against the outer wall of the transmission rod 23, thereby achieving a sealing effect; even if the sealing gasket 25 melts, the connection between the transmission rod 23 and the ball valve assembly 3 can be sealed, thereby improving the safety of liquid transportation.

[0033] Furthermore, the blocking unit further includes a sealing ring 602 arranged on the inner circumferential wall of the blocking ring 61 , and the sealing ring 602 has a horizontal W-shaped structure. When the inner chamber 601 is squeezed, the sealing ring 602 blocks the outer wall of the transmission rod 23 .

[0034] In order for the liquid or gas to push the expansion piece 65 to move when liquid or gas seeps in, the expansion agent inside the inner chamber 601 is squeezed to push the sealing ring 602 to deform, so that the sealing ring 602 fits on the transmission rod 23 to achieve sealing.

[0035] In one embodiment, please refer to the attached instructions. Figure 1-3 As shown in Figures 5 and 5 , the ball valve assembly 3 includes a main valve body 31 connected to the valve body assembly 4 . A ball 32 is provided inside the main valve body 31 , and the ball 32 rotates inside the main valve body 31 .

[0036] Ordinary ball valves have some limitations during actual use. On the one hand, the valve seat of an ordinary ball valve usually adopts an integral structure, that is, the valve seat is sealed with the ball 32 and the valve body at the same time. During the switching operation of the ball valve, relative movement and friction will occur between the valve seat and the ball 32, and this wear will lead to a decrease in sealing performance. Since the valve seat is an integral structure, once the part that seals with the ball 32 is worn and needs to be replaced, the entire valve seat must be replaced. When the material used for the valve seat is relatively expensive, this will undoubtedly greatly increase the maintenance cost. The two valve body assemblies 4 are connected to the main valve body 31 by bolts; even if the two valve body assemblies 4 are damaged in any way, only the valve body assemblies 4 need to be replaced in time, thereby reducing maintenance costs.

[0037] In one embodiment, please refer to the attached instructions. Figure 1-3 As shown, the valve body assembly 4 includes a side valve body 41 connected to both sides of the main valve body 31, and a graphite gasket 45, an O-ring 46, a front valve seat 42 and a rear valve seat 43 are installed inside the side valve body 41. There are two graphite gaskets 45, the front valve seat 42 is located on one side of the rear valve seat 43, a graphite gasket 45 is arranged between the front valve seat 42 and the rear valve seat 43, a graphite gasket 45 is arranged between the ball 32 and the front valve seat 42, and a disc spring 44 is arranged between the side valve body 41 and the rear valve seat 43.

[0038] Ordinary ball valves often use multiple cylindrical springs for valve seat elastic compensation. This installation method not only increases the complexity of processing and prolongs processing time, but is also cumbersome during the installation process, requiring a lot of manpower and time. In order to solve the problems existing in the above-mentioned ordinary ball valves and meet the needs of industrial production to reduce maintenance costs and improve work efficiency, a ball valve with a replaceable valve seat sealing surface has been developed. This ball valve effectively overcomes the shortcomings of ordinary ball valves by splitting the valve seat into a front valve seat 42 and a rear valve seat 43, using a graphite gasket for sealing, optimizing the valve seat elastic compensation method, and improving the valve seat disassembly structure. The innovative design has significant economic and practical value.

[0039] In one embodiment, please refer to the attached instructions. Figure 1-3 As shown, the bottom of the main valve body 31 is provided with an end cap 5, which is connected to the main valve body 31 by bolts. The top of the bracket 22 is provided with an actuator 1, which is used to drive the transmission rod 23 to rotate. The actuator 1 is a prior art and is used to drive the transmission rod 23 to rotate.

[0040] When the present invention is in use, when liquid seepage or gas seepage occurs, the expansion piece 65 moves, and the expansion agent inside the inner chamber 601 is squeezed to push the sealing ring 602 to deform. At the same time, the sealing ring 602 seals the connection between the transmission rod 23 and the main valve body 31; at the same time, the push block 64 pushes the warning rod 62 to move out of the outside of the main valve body 31, and the warning rod 62 moves to warn. When high temperature occurs, the expansion agent inside the inner chamber 601 is vaporized, causing the inner chamber 601 to push the expansion piece 65 downward to move, and the expansion piece 65 squeezes the movable block 66 downward. During the downward movement of the movable block 66, the protrusion at the bottom is squeezed on the sealing gasket 25 to make up for the thickness of the melted or deformed sealing gasket 25. At the same time, the extrusion block 68 will be squeezed on the block 69 during the downward movement, and the block 69 is squeezed outward to drive the inner wall of the sealing ring 61 to move outward and fit the outer circumference of the transmission rod 23; when the movable block 66 moves downward, it drives the extrusion block 68 to squeeze the block 69 to move, and the block 69 is squeezed on the sealing ring 61, so that the block 69 deforms the outer wall of the sealing ring 61, and the two sealing blocks 610 are abutted against the outer wall of the transmission rod 23, thereby achieving the sealing effect.

[0041] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed ball valve, characterized in that: The invention comprises a ball valve assembly (3), wherein a valve body assembly (4) is arranged on the ball valve assembly (3), and the valve body assembly (4) cooperates with the ball valve assembly (3) to convey and block the flow of fluid; and a blocking assembly (6) is installed on the ball valve assembly (3), and the blocking assembly (6) is used to block a leaking ball valve assembly (3).

2. A sealed ball valve according to claim 1, characterized in that: It also comprises an adjusting component (2), wherein the adjusting component (2) is used to drive the ball valve component (3) to rotate, so as to realize opening and closing between the ball valve component (3) and the valve body component (4); The regulating assembly (2) comprises a sealing gasket (25) arranged inside the ball valve assembly (3), and a plugging assembly (6) is mounted on the sealing gasket (25); a sealing ring (24) is mounted on the plugging assembly (6), and a bracket (22) is arranged on the sealing ring (24), and a pressure cover (21) is arranged on the bracket (22), and the pressure cover (21) is used to press the sealing ring (24); a transmission rod (23) is arranged inside the bracket (22), and an end of the transmission rod (23) passes through the inside of the sealing ring (24), the plugging assembly (6) and the sealing gasket (25), and extends to the inside of the ball valve assembly (3); the transmission rod (23) rotates to drive the ball valve assembly (3) to rotate.

3. A sealed ball valve according to claim 2, characterized in that: The blocking assembly (6) comprises a blocking unit and an expansion unit; the blocking unit is used to seal the transmission rod (23) and the ball valve assembly (3); the expansion unit is used to push the blocking unit to move and fit onto the outer wall of the transmission rod (23); The expansion and contraction unit comprises a sealing ring (61) arranged on a sealing gasket (25); an expansion sheet (65) is arranged inside the sealing ring (61); an annular inner chamber (601) is formed between the sealing ring (61) and the expansion sheet (65); the interior of the inner chamber (601) is used to store an expansion agent; a warning piece is arranged inside the inner chamber (601); the warning piece is used for early warning; when the expansion agent expands, the warning piece moves outward, and the sealing unit seals the connection between the transmission rod (23) and the ball valve assembly (3).

4. A sealed ball valve according to claim 3, characterized in that: The warning member comprises an elastic member (63) arranged inside the inner chamber (601), a push block (64) being arranged on the elastic member (63), a warning rod (62) being arranged on the push block (64), one end of the warning rod (62) passing through the interior of the elastic member (63) and extending outwards, the elastic member (63) being used to push the elastic member (63) to reset, one end of the elastic member (63) being sealedly connected to the inner wall of the inner chamber (601), and the other end being sealedly connected to the push block (64).

5. A sealed ball valve according to claim 3, characterized in that: The blocking unit comprises a movable block (66) arranged inside the blocking ring (61), and the movable block (66) slides up and down inside the blocking ring (61); a plurality of through holes (67) are arranged inside the blocking ring (61), an inwardly protruding extrusion block (68) is arranged on the circumferential inner wall of the blocking ring (61), and a stopper (69) is arranged on the inner wall of the blocking ring (61), and the extrusion block (68) and the stopper (69) are pressed against each other.

6. A sealed ball valve according to claim 5, characterized in that: The sealing ring (61) is annular in structure, and at least one sealing block (610) is provided on the outer wall of the inner circumference of the sealing ring (61). The sealing block (610) is annular in structure, and when the sealing block (610) is squeezed, the sealing block (610) fits against the transmission rod (23).

7. A sealed ball valve according to claim 6, characterized in that: The blocking unit further comprises a sealing ring (602) arranged on the inner circumferential wall of the blocking ring (61), and the sealing ring (602) is in a transverse W-shaped structure. When the inner chamber (601) is squeezed, the sealing ring (602) blocks the outer wall of the transmission rod (23).

8. A sealed ball valve according to claim 3, characterized in that: The ball valve assembly (3) comprises a main valve body (31) connected to a valve body assembly (4); a ball (32) is arranged inside the main valve body (31); and the ball (32) rotates inside the main valve body (31).

9. A sealed ball valve according to claim 8, characterized in that: The valve body assembly (4) includes a side valve body (41) connected to both sides of the main valve body (31), and a graphite gasket (45), an O-ring (46), a front valve seat (42) and a rear valve seat (43) are installed inside the side valve body (41). Two graphite gaskets (45) are provided. The front valve seat (42) is located on one side of the rear valve seat (43), and a graphite gasket (45) is provided between the front valve seat (42) and the rear valve seat (43). A graphite gasket (45) is provided between the ball (32) and the front valve seat (42), and a disc spring (44) is provided between the side valve body (41) and the rear valve seat (43).

10. A sealed ball valve according to claim 8, characterized in that: An end cover (5) is provided at the bottom of the main valve body (31), and the end cover (5) is connected to the main valve body (31) by means of bolts; an actuator (1) is provided at the top of the bracket (22), and the actuator (1) is used to drive the transmission rod (23) to rotate.

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