A type of openable sealing ball valve

Abstract

This invention discloses an openable sealing ball valve, comprising a valve body and a valve stem rotation and lifting operating mechanism movably mounted on the top of the valve body. Both ends of the valve body are flanged and connected to connecting pipes. A ball valve assembly is disposed within the inner cavity of the valve body, and the rotation and lifting operating mechanism extends to connect with the ball valve assembly. Sealing ring blocks are disposed on opposite sides of the two connecting pipes. The ball valve assembly includes a valve core made of elastic material, with sealing plugs disposed on both sides of the valve core. Water inlets are penetrating the front and rear sides of the valve core. A connector is disposed at the top of the valve core, which is connected to the valve stem rotation and lifting operating mechanism. When the connector is driven to descend, the elastic deformation of the valve core causes the sealing plugs on both sides to move outward, forming a tight seal with the sealing ring blocks. This invention utilizes the synergistic effect of the elastically deformable valve core and the conical sealing pair: the rotation and lifting operating mechanism drives the valve core to expand radially, causing the frustum-shaped sealing plugs to form a wedge-shaped seal with a self-tightening effect with the spring-preloaded sealing ring blocks.

Description

Technical Field

[0001] This invention relates to the field of valve technology, specifically a spreading-type sealing ball valve. Background Technology

[0002] Traditional ball valves typically operate with simultaneous rotation and sealing, meaning the valve core rotates while the sealing surface simultaneously engages and disengages. This linked structure causes the sealing surface to slide circumferentially while maintaining continuous contact during valve core rotation, resulting in intense relative friction. This friction directly translates into operating resistance, significantly increasing the opening and closing torque. Especially in large-diameter ball valves or those with worn sealing surfaces, manual operation often requires levers or other auxiliary tools, and sometimes even electric actuators, drastically increasing operating costs and difficulty. More seriously, continuous friction creates irregular scratches and uneven wear on the sealing surface, compromising its smoothness. Initially, this may lead to minor media leakage, but as wear intensifies, the gap between the sealing surfaces widens, eventually causing serious leakage. This forces companies to frequently replace core components such as sealing rings and valve cores, significantly shortening the lifespan of sealing components and increasing the frequency and cost of equipment maintenance. Summary of the Invention

[0003] The purpose of this invention is to provide a spreading-type sealing ball valve to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: an openable sealing ball valve, comprising a valve body and a valve stem rotation and lifting operating mechanism movably mounted on the top of the valve body, wherein both the left and right ends of the valve body are flanged and connected to connecting pipes, a ball valve assembly is provided in the inner cavity of the valve body, and the rotation and lifting operating mechanism extends to connect with the ball valve assembly;

[0005] Both connecting pipes have sealing ring blocks on opposite sides. The ball valve assembly includes a valve core made of elastic material, with sealing plugs on both sides of the valve core. Water inlets are provided on both the front and rear sides of the valve core. A connector is provided at the top of the valve core, which is connected to the valve stem rotation and lifting mechanism. When the connector is driven to descend, the elastic deformation of the valve core causes the sealing plugs on both sides to move outward, forming a tight seal with the sealing ring blocks. At the same time, the valve stem rotation and lifting mechanism drives the valve core to rotate, realizing the switching between the water inlet and the connecting pipe or the sealing plugs closing the connecting pipe.

[0006] Furthermore, a groove is provided at one end of the connecting pipe near the valve body, and the sealing ring block is movably embedded in the groove. An annular support is provided on the groove, and several springs are connected between the annular support and the sealing ring block to push the sealing ring block to move towards one side of the valve body. The cross-section of the sealing plug is a frustum structure, and the sealing ring block is provided with an inner frustum-shaped sealing surface that cooperates with the frustum-shaped sealing plug. When the valve core is deformed by pressure, the outer surface of the sealing plug expands radially and forms a contact seal with the sealing surface of the sealing ring block.

[0007] Furthermore, the outer circumferential surface of the annular support is provided with sealing filler to fill the gap between the annular support and the sealing ring block.

[0008] Furthermore, a push block is provided on the inner end of the sealing ring block, and a fixing frame adapted to the interior of the connecting pipe is provided on the inner wall of the connecting pipe. Several support rods are equidistantly arranged in the fixing frame. The support rods are rotatably connected to the fixing frame and reset by a torsion spring. A corresponding slot is opened at the end of the fixing frame near the valve body. An arc-shaped pressure block is sleeved at the end of the support rod. The arc-shaped pressure block extends to the outside of the fixing frame through the slot. When the sealing plug is pushed outward by the deformation of the valve core, the push block contacts and squeezes the arc-shaped pressure block, causing the support rod to rotate against the resistance of the torsion spring. Each support rod is provided with a sealing plate. In the initial state, each sealing plate is arranged perpendicular to the water flow direction. When the sealing plug pushes the push block, all support rods rotate synchronously to an inclined state, so that the sealing plate forms an angle with the water flow direction, thereby effectively dispersing and weakening the impact force of the water flow.

[0009] Furthermore, a bowl-shaped sealing ring is provided on the end face of the sealing plug away from the valve body, with the opening of the bowl-shaped sealing ring facing the direction of the connecting pipe.

[0010] Furthermore, the valve stem rotation and lifting mechanism includes a valve seat, a valve stem, and an adjusting wheel. The valve seat is fixedly installed on the top of the valve body, and an adjusting rod is rotatably mounted in its inner cavity. The valve stem is nested inside the adjusting rod, with a threaded rod coaxially connected to its top end and a connector to its bottom end. The threaded rod and the adjusting wheel form a threaded engagement. The adjusting wheel is rotatably mounted on the top of the valve seat, and when it rotates, it can drive the threaded rod to lift the valve stem. A rotating rod extends from the top of the adjusting rod, and by rotating the rotating rod, the adjusting rod and the valve stem can be rotated synchronously to realize the opening and closing switching of the valve core.

[0011] Furthermore, the valve stem is connected to a pressure plate in the bearing portion within the valve body cavity, and an elastic air bladder is connected to the lower end of the pressure plate; a fixing plate is provided on the inner wall of the valve body, the fixing plate is located above the valve core and below the pressure plate, a sealing air ring is embedded on the outer end face of the sealing plug, and the two ends of the elastic air bladder are respectively connected to the sealing air rings on both sides through branch pipes.

[0012] Furthermore, a lower tube seat is detachably provided at the bottom end of the valve body; a support rod is rotatably connected to the middle of the lower tube seat, and the top end of the support rod is detachably connected to the middle of the bottom end of the valve core, for rotating to support the valve core and holding the bottom of the valve core.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention utilizes the synergistic effect of an elastically deformable valve core and a conical sealing pair: the valve core is driven to expand radially through a rotary lifting mechanism, causing the frustum-shaped sealing plug and the spring-loaded sealing ring to form a wedge-shaped seal with a self-tightening effect. The flexible expansion method can drive the sealing plug to move outward synchronously, so that the contact pressure between the sealing plug and the sealing ring is evenly distributed. Compared with the traditional hard-seal ball valve that relies on mechanical extrusion for sealing, this design can effectively adapt to minor imperfections on the sealing surface and avoid leakage caused by insufficient local pressure.

[0015] By combining the secondary sealing of the cup-shaped sealing ring and the pneumatic auxiliary system, a triple sealing system of "mechanical expansion, elastic compensation and pressure self-adaptation" is constructed; this design solves the problems of easy wear of the sealing surface of traditional ball valves and leakage under high pressure conditions.

[0016] In addition, the present invention incorporates a support rod sealing plate buffer system within the connecting pipe. When the valve is closed, the push block of the sealing plug triggers the support rod to rotate, causing multiple sealing plates to change from a vertical state to an inclined layout. Without additional power, the impact force of high-speed fluid can be dispersed to multiple force surfaces, preventing the sealing structure from being worn due to turbulent impact. The sealing ring block adopts a spring preload design to always maintain the initial contact force with the sealing plug, preventing dry friction damage during opening and closing. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an openable sealing ball valve according to the present invention;

[0018] Figure 2 for Figure 1 Enlarged view of a portion of point A in the middle;

[0019] Figure 3 This is a schematic diagram of the valve core structure of the present invention;

[0020] Figure 4 This is a schematic diagram of the fixed frame structure;

[0021] Figure 5 This is a schematic diagram of the support structure;

[0022] Figure 6 This is a schematic diagram of the valve stem rotation and lifting mechanism.

[0023] In the diagram, the components are: valve body-1, connecting pipe-2, sealing ring block-3, valve core-4, sealing plug-5, water inlet-6, connector-7, groove-8, annular support-9, spring-10, sealing packing-11, push block-12, fixing frame-13, support rod-14, arc-shaped pressure block-15, sealing plate-16, cup-shaped sealing ring-17, valve seat-18, valve stem-19, adjusting wheel-20, adjusting rod-21, threaded rod-22, rotating rod-23, pressure plate-24, elastic airbag-25, sealing air ring-26, lower pipe seat-27, support rod-28, fixing plate-29, and branch pipe-30. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] like Figures 1 to 6 As shown, a type of openable sealing ball valve includes a valve body 1 and a valve stem rotation and lifting operating mechanism movably mounted on the top of the valve body 1. Both ends of the valve body 1 are flanged and connected to connecting pipes 2. A ball valve assembly is installed inside the valve body 1, and the rotation and lifting operating mechanism extends to connect with the ball valve assembly. The valve stem rotation and lifting operating mechanism includes a valve seat 18, a valve stem 19, and an adjusting wheel 20. The valve seat 18 is fixedly installed on the top of the valve body 1, and an adjusting rod 21 is rotatably mounted inside its cavity. The valve stem 19 is nested inside the adjusting rod 21, with a threaded rod 22 coaxially connected to its top end and a connector 7 connected to its bottom end. The threaded rod 22 and the adjusting wheel 20 form a threaded engagement. The adjusting wheel 20 is rotatably mounted on the top of the valve seat 18, and when rotated, it can drive the threaded rod 22 to raise and lower the valve stem 19. A rotating rod 23 extends from the top of the adjusting rod 21, and by rotating the rotating rod 23, the adjusting rod 21 and the valve stem 19 can be rotated synchronously, realizing the opening and closing switching of the valve core 4.

[0026] Two connecting pipes 2 are provided with sealing ring blocks 3 on opposite sides. The ball valve assembly includes an olive-shaped valve core 4 made of elastic material. Sealing plugs 5 are provided on the left and right sides of the valve core 4. Water inlets 6 are provided on the front and rear sides of the valve core 4. A connector 7 is provided at the top of the valve core 4. The connector 7 is connected to the valve stem rotation and lifting operation mechanism. When the connector 7 is driven to descend, the valve core 4 elastically deforms and causes the sealing plugs 5 on both sides to move outward, forming a tight seal with the sealing ring blocks 3. At the same time, the valve stem rotation and lifting operation mechanism drives the valve core 4 to rotate, realizing the switching of the water inlet 6 to the connecting pipe 2 or the sealing plugs 5 to the connecting pipe 2.

[0027] In this embodiment, a groove 8 is provided at one end of the connecting pipe 2 near the valve body 1. The sealing ring block 3 is movably embedded in the groove 8. An annular support 9 is provided on the groove 8, and several springs 10 are connected between the annular support 9 and the sealing ring block 3 to push the sealing ring block 3 to move towards one side of the valve body 1. The sealing plug 5 has a frustum cross-section. The sealing ring block 3 has an inner frustum-shaped sealing surface that cooperates with the frustum-shaped sealing plug 5. When the valve core 4 is deformed by pressure, the outer surface of the sealing plug 5 expands radially and forms a contact seal with the sealing surface of the sealing ring block 3. A sealing filler 11 is provided on the outer circumferential surface of the annular support 9 to fill the gap between the annular support 9 and the sealing ring block 3 and prevent the medium from leaking from the mating surface of the annular support 9 and the sealing ring block 3.

[0028] The groove 8 at the end of the connecting pipe 2 near the valve body 1 provides installation and positioning space for the sealing ring block 3. The annular support 9 is fixed in the groove 8, and several springs 10 between it and the sealing ring block 3 are always in a pre-compressed state. The elastic force of the springs 10 continuously pushes the sealing ring block 3 towards the valve body 1, so that the sealing ring block 3 and the sealing plug 5 maintain the initial contact tendency, avoiding initial leakage caused by gaps.

[0029] The sealing plug 5 adopts a frustum structure, and the sealing ring block 3 is correspondingly provided with an inner frustum-shaped sealing surface. This "conical surface fit" structure forms a wedge-shaped sealing pair. When the valve core 4 is driven to undergo elastic deformation, the sealing plug 5 moves outward with the expansion of the valve core 4. Its frustum-shaped outer surface makes surface contact with the inner frustum-shaped sealing surface of the sealing ring block 3. As the deformation pressure of the valve core 4 increases, the positive pressure between the two conical surfaces increases synchronously. Combined with the self-tightening effect of the conical surface, a more reliable sealing effect than planar contact is achieved, effectively blocking the medium from penetrating from the sealing surface.

[0030] When the ball valve needs to be closed, first rotate the lever 23 to rotate the valve stem 19 via the adjusting lever 21, which in turn rotates the valve core 4, causing the sealing plug 5 to rotate to the same side as the connecting pipe 2. Then, rotate the lifting adjusting wheel 20, and drive the valve stem 19 downward through the threaded engagement of the threaded rod 22 and the adjusting wheel 20. The bottom end of the valve stem 19 applies downward pressure to the valve core 4 through the connecting head 7. Since the valve core 4 is made of an elastic deformation material, the pressure causes the valve core 4 to expand radially, driving the sealing plugs 5 on both sides to move outward synchronously.

[0031] During the movement of the sealing plug 5, on the one hand, its frustum-shaped outer surface forms a wedge-shaped fit with the inner frustum-shaped sealing surface of the sealing ring block 3, achieving the main seal under the deformation pressure of the valve core 4; on the other hand, the sealing plug 5 pushes the sealing ring block 3 to compress the spring 10, and the reaction force of the spring 10 further enhances the fitting pressure of the sealing surface.

[0032] After sealing is completed, if the ball valve needs to be opened, first rotate the adjusting wheel 20 in the opposite direction so that the valve stem 19 rises and the valve core 4 returns to its original position due to its own elasticity. The sealing plug 5 and the sealing ring block 3 are in slight contact. Rotate the rotating rod 23 at the top of the adjusting rod 21. The rotating rod 23 drives the adjusting rod 21 and the nested valve stem 19 to rotate synchronously. The valve stem 19 drives the valve core 4 to rotate through the connector 7. When the valve core 4 rotates until its through-hole 6 is aligned with the axis of the connecting pipes 2 on both sides, the medium can flow through the through-hole 6 between the connecting pipes 2, thus opening the ball valve.

[0033] In this embodiment, a push block 12 is provided on the inner end of the sealing ring block 3, and a fixing frame 13 adapted to the interior of the connecting pipe 2 is provided on the inner wall of the connecting pipe 2. Several support rods 14 are equidistantly arranged in the fixing frame 13. The support rods 14 are rotatably connected to the fixing frame 13 and reset by a torsion spring. A corresponding slot is opened at the end of the fixing frame 13 near the valve body 1. An arc-shaped pressure block 15 is sleeved at the end of the support rod 14. The arc-shaped pressure block 15 extends to the outside of the fixing frame 13 through the slot. When the sealing plug 5 is pushed outward by the deformation of the valve core 4, the push block 12 contacts and squeezes the arc-shaped pressure block 15, causing the support rod 14 to rotate against the resistance of the torsion spring. Each support rod 14 is provided with a sealing plate 16. In the initial state, each sealing plate 16 is arranged perpendicular to the water flow direction. When the sealing plug 5 pushes the push block 12, all support rods 14 rotate synchronously to an inclined state, so that the sealing plate 16 forms an angle with the water flow direction, thereby effectively dispersing and weakening the impact force of the water flow.

[0034] When the valve core 4 deforms and pushes the sealing plug 5 outward, the push block 12 at the inner end of the sealing ring block 3 moves synchronously with the sealing plug 5, comes into contact with the arc-shaped pressure block 15 and generates a squeezing force. When the arc-shaped pressure block 15 is compressed, it will rotate. This force overcomes the reset resistance of the torsion spring and drives the support rod 14 to rotate around the fixed frame 13, so that all the sealing plates 16 synchronously change from the vertical state (when the pipeline is open, the sealing plate 16 is perpendicular to the water flow direction, and its force-bearing surface has a low overlap with the water flow path, which can minimize the obstruction of the flowing medium, reduce the water flow resistance, and ensure that the medium passes through the water inlet 6 and the connecting pipe 2 with high efficiency, thus ensuring the pipeline flow rate) to the inclined state, forming an angle with the water flow direction. This inclined layout changes the medium flow path, so that the water flow impact force is dispersed to the surface of multiple sealing plates 16, rather than concentrated on the sealing surface, thereby effectively reducing the impact damage of the water flow on the sealing structure and extending the service life of the sealing components.

[0035] In this embodiment, a bowl-shaped sealing ring 17 is provided on the end face of the sealing plug 5 away from the valve body 1, with the opening of the bowl-shaped sealing ring 17 facing the connecting pipe 2. When the valve core 4 is driven to undergo elastic deformation, causing the sealing plug 5 to expand outward synchronously, the bowl-shaped sealing ring 17 moves towards the sealing ring block 3 along with the sealing plug 5. As the sealing plug 5 continues to move outward, the edge of the bowl-shaped sealing ring 17 first abuts against the end face of the sealing ring block 3. Due to the flexibility of the sealing ring, the expansion force of the sealing plug 5 will cause the edge of the sealing ring to bend adaptively after abutment. This bending changes the contact between the sealing ring and the sealing ring block 3 from line contact to surface contact, greatly increasing the sealing contact area and initially blocking the medium leakage channel.

[0036] When the ball valve is closed, the medium pressure in the connecting pipe 2 acts on the inner curved surface of the cup-shaped sealing ring 17 (because the opening faces the connecting pipe 2, the medium can directly contact the inner side). The medium pressure pushes the curved part of the cup-shaped sealing ring 17 to further fit against the sealing ring block 3, forming a "pressure self-tightening" effect: the greater the medium pressure, the stronger the contact pressure between the sealing ring and the sealing ring block 3, and the better the sealing effect. Finally, it forms a double seal with the main sealing surface of the sealing plug 5 and the sealing ring block 3, effectively compensating for any minor defects that may exist on the main sealing surface and strengthening the overall sealing reliability.

[0037] In this embodiment, the valve stem 19 is connected to a pressure plate 24 in the bearing portion inside the valve body 1 cavity, and an elastic air bladder 25 is connected to the lower end of the pressure plate 24; a fixing plate 29 is provided on the inner wall of the valve body 1, the fixing plate 29 is located above the valve core 4 and below the pressure plate 24, a sealing air ring 26 is embedded on the outer end face of the sealing plug 5, and the two ends of the elastic air bladder 25 are respectively connected to the sealing air rings 26 on both sides through the branch pipe 30.

[0038] When the valve stem 19 moves downward and pushes the valve core 4 to deform, the pressure plate 24 moves downward simultaneously and squeezes the elastic air bag 25 below. The internal volume of the air bag decreases and the pressure increases. The elastic air bag 25 is connected to the sealing ring 26 on the outer end face of the sealing plug 5 through the branch pipe 30. The gas inside it enters the sealing ring 26 through the branch pipe 30, causing the sealing ring 26 to expand and bulge, tightly fitting the sealing surface of the sealing ring block 3, forming an airtight auxiliary layer.

[0039] When the valve stem 19 rises, the elastic air bladder 25, which had previously deformed under the pressure of the pressure plate, begins to reset under its own elastic restoring force. As the elastic air bladder 25 resets, its internal volume gradually increases, creating a local negative pressure environment. This negative pressure exerts an adsorption force on the sealing ring 26 through the branch pipe connecting the two, thereby drawing the gas inside the sealing ring 26 back into the elastic air bladder 25. This process causes the sealing ring 26 to contract synchronously, completely relieving the pressure between it and the sealing ring block, thus avoiding any obstruction to the subsequent rotation of the valve core.

[0040] In this embodiment, a lower tube seat 27 is detachably provided at the bottom end of the valve body 1; a support rod 28 is rotatably connected to the middle of the lower tube seat 27, and the top end of the support rod 28 is detachably connected to the middle of the bottom end of the valve core 4 by bolts, which is used to rotate and support the valve core 4 and pull the bottom of the valve core 4. When the valve core 4 needs to be repaired, the lower tube seat 27 at the bottom end of the valve body 1 can be removed, and the valve core 4 can be maintained from the bottom end of the valve body 1.

[0041] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A type of expanding sealing ball valve, characterized in that: The valve body includes a valve body and a valve stem rotation and lifting mechanism movably mounted on the top of the valve body. Both ends of the valve body are flanged and connected to connecting pipes. A ball valve assembly is provided in the inner cavity of the valve body, and the rotation and lifting mechanism extends to connect with the ball valve assembly. Both sides of the two connecting pipes are provided with sealing ring blocks. The ball valve assembly includes a valve core made of elastic material. Sealing plugs are provided on the left and right sides of the valve core. Water inlets are provided on the front and rear sides of the valve core. A connector is provided at the top of the valve core. The connector is connected to the valve stem rotation and lifting operation mechanism. When the connector is driven to descend, the elastic deformation of the valve core causes the sealing plugs on both sides to move outward, forming a tight seal with the sealing ring blocks. At the same time, the valve stem rotation and lifting operation mechanism drives the valve core to rotate, realizing the switching of the water inlet and the connecting pipe being open or the sealing plugs closing the connecting pipe. The connecting pipe has a groove at one end near the valve body, and the sealing ring block is movably embedded in the groove. An annular support is provided on the groove, and several springs connect the annular support and the sealing ring block to push the sealing ring block towards the valve body. The sealing plug has a frustum-shaped cross-section, and the sealing ring block has an inner frustum-shaped sealing surface that mates with the frustum-shaped sealing plug. When the valve core is compressed and deformed, the outer surface of the sealing plug expands radially, forming a contact seal with the sealing surface of the sealing ring block. A push block is provided on the inner end of the sealing ring block, and a fixing frame adapted to the interior of the connecting pipe is provided on the inner wall of the connecting pipe. Several support rods are equidistantly arranged within the fixing frame, and the support rods rotate with the fixing frame. The connection is achieved and reset via a torsion spring. A corresponding slot is provided at one end of the fixing frame near the valve body. An arc-shaped pressure block is fitted at the end of the support rod, extending through the slot to the outside of the fixing frame. When the sealing plug is pushed outward by the deformation of the valve core, the push block contacts and presses against the arc-shaped pressure block, causing the support rod to rotate against the resistance of the torsion spring. Each support rod is equipped with a sealing plate. In the initial state, each sealing plate is arranged perpendicular to the water flow direction. When the sealing plug pushes the push block, all support rods rotate synchronously to an inclined state, making the sealing plate form an angle with the water flow direction, thereby effectively dispersing and weakening the water flow impact force. A bowl-shaped sealing ring is provided on the end face of the sealing plug away from the valve body, with the opening of the bowl-shaped sealing ring facing the connecting pipe direction. The valve stem rotation and lifting mechanism includes a valve seat, a valve stem, and an adjusting wheel. The valve seat is fixedly installed on the top of the valve body, and an adjusting rod is rotatably mounted in its inner cavity. The valve stem is nested inside the adjusting rod, with a threaded rod coaxially connected to its top end and a connector to its bottom end. The threaded rod and the adjusting wheel form a threaded engagement. The adjusting wheel is rotatably mounted on the top of the valve seat, and its rotation drives the threaded rod to lift the valve stem. A rotating rod extends from the top of the adjusting rod, and rotating the rotating rod synchronously drives the adjusting rod and the valve stem to rotate, thus switching the valve core between opening and closing. A pressure plate is connected to the bearing portion of the valve stem located inside the valve body cavity, and an elastic air bladder is connected to the lower end of the pressure plate. A fixing plate is provided on the inner wall of the valve body, located above the valve core and below the pressure plate. A sealing air ring is embedded on the outer end face of the sealing plug, and the two ends of the elastic air bladder are respectively connected to the sealing air rings on both sides through branch pipes.

2. The expanding sealing ball valve according to claim 1, characterized in that: The outer circumferential surface of the annular support is provided with sealing filler to fill the gap between the annular support and the sealing ring block.

3. The expanding sealing ball valve according to claim 1, characterized in that: The bottom end of the valve body is detachably provided with a lower tube seat; a support rod is rotatably connected to the middle of the lower tube seat, and the top end of the support rod is detachably connected to the middle of the bottom end of the valve core, which is used to rotate and support the valve core and hold the bottom of the valve core.

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