Eccentric semi-ball valve capable of being maintained on line

Abstract

The utility model discloses an eccentric semi-ball valve capable of being maintained on line. The eccentric semi-ball valve comprises a valve body, a valve element, a sealing seat and a driving assembly. A valve cavity is formed in the valve body, a first opening, a second opening and a maintenance opening which are communicated with the valve cavity are further formed in the valve body, and a detachable valve deck is connected outside the maintenance opening in a sealed mode. The valve element is rotatably installed in the valve cavity and comprises a sealing disc and a main sealing piece arranged on the sealing disc, and the main sealing piece can rotate along with the valve element and switch the position between the first opening and the maintenance opening. The sealing seat is positioned in the maintenance opening; the driving assembly is connected with the sealing seat and can drive the sealing seat to rotate; during online maintenance, the driving assembly drives the sealing seat to rotate to be in contact sealing with the sealing disc, the sealing disc, the sealing seat and the valve deck form an isolation cavity at the maintenance opening, the main sealing piece is located in the isolation cavity, and the main sealing piece can be maintained by disassembling the valve deck. According to the scheme, the eccentric semi-ball valve is simpler in structure, and the overhauling process is faster.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more particularly to an eccentric hemispherical valve which can be maintained online. Background Art

[0002] During use or at the end of its service life, the spool seal of an eccentric hemispherical valve may wear or damage, leading to leakage. This can necessitate replacement of the damaged seal. However, in some applications, this requires shutting off the flow of water and closing all valves in the pipeline. This prevents the seal from being replaced while the eccentric hemispherical valve is operating, hindering timely resolution of leaks caused by seal damage.

[0003] In order to replace the worn or damaged seal ring of the valve core without shutting off the water supply when the valve core seal ring is found to be worn or damaged, causing the valve to leak, the prior art, for example, has an eccentric hemispherical valve with a liftable sealing seat inside the valve. When the eccentric hemispherical valve is fully opened, the liftable sealing seat can descend to its lower end to abut and seal against the outer side of the hemispherical valve disc, thereby forming a sealed pressure chamber between the valve cover and the hemispherical valve disc. Another example is a valve with online maintenance, disclosed in CN111365472A, which has a movable member and an inspection port on the valve body. The movable member is mounted at the inspection port and is sealed to the valve body. The valve core can be switched and rotated between the inlet or outlet and the inspection port. When the valve needs to be repaired, the movable member moves downward to seal against the valve core, isolating the valve cavity from the inspection port and positioning the first sealing assembly within the inspection port.

[0004] Existing solutions enable online maintenance by controlling the vertical movement of the sealing valve seat or movable member to maintain sealing contact with the valve core during valve operation. However, these solutions use bolts and screws to control the vertical movement of the sealing valve seat or movable member. This requires tightening and loosening multiple actuators each time, resulting in a complex structure with numerous components. Furthermore, numerous parts must be disassembled and installed during maintenance, resulting in low maintenance efficiency. Summary of the Invention

[0005] The utility model provides an eccentric hemispherical valve that can be maintained online. In this solution, the sealing seat can be in sealing contact with the valve core more conveniently, and at the same time, the structure of the eccentric hemispherical valve is further simplified, thereby improving maintenance efficiency.

[0006] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0007] An eccentric hemispherical valve capable of online maintenance, comprising:

[0008] A valve body, wherein a valve cavity is defined in the valve body, and the valve body is further provided with a first opening, a second opening, and a maintenance port communicating with the valve cavity, wherein the maintenance port is externally sealed and connected to a detachable valve cover;

[0009] a valve core rotatably mounted in the valve cavity, comprising a sealing disk and a main sealing member disposed on the sealing disk, wherein the main sealing member is capable of rotating with the valve core and switching positions between the first opening and the maintenance port;

[0010] Also includes:

[0011] a sealing seat, located in the maintenance port;

[0012] a driving assembly connected to the sealing seat and capable of driving the sealing seat to rotate;

[0013] During online maintenance, the drive assembly drives the sealing seat to rotate until it contacts and seals with the sealing disk. The sealing disk, the sealing seat and the valve cover form an isolation chamber at the maintenance port. The main seal is located in the isolation chamber. The main seal can be inspected by disassembling the valve cover.

[0014] As a further improvement, the drive assembly includes a connecting shaft and a drive part, one end of the connecting shaft passes through the valve body and is connected to the side of the sealing seat close to the second opening, and the other end is connected to the drive part; the drive part drives the connecting shaft to rotate the sealing seat.

[0015] As a further improvement, the driving portion is a driving handle, and a first connecting hole is provided on the driving handle for fixed connection with the connecting shaft.

[0016] As another improvement, the drive assembly further includes a locking disk and a locking rod, wherein the locking disk is fixedly arranged relative to the valve body, and the connecting shaft passes through the locking disk and is connected to the drive unit; the locking rod is located on the drive unit and rotates with the drive unit;

[0017] A first locking fitting portion is provided on the locking disk, and a second locking fitting portion is provided on the locking rod. When the locking rod rotates following the driving portion, the second locking fitting portion can be selectively connected to the first locking fitting portion to lock and position the sealing seat.

[0018] As a preferred embodiment, the first locking fitting portion includes a first locking position and a second locking position; the second locking fitting portion includes a locking protrusion;

[0019] When the locking protrusion is rotated to be engaged with the first locking position, the sealing seat can be locked in a position in contact with the sealing disk for sealing;

[0020] When the locking protrusion is rotated to be engaged with the second locking position, the sealing seat can be locked in a position where the isolation cavity is fully opened.

[0021] Furthermore, a limiting edge is provided on the locking disk, and the limiting edge is located on both sides of the first locking fitting portion, and the limiting edge is used to limit the driving portion.

[0022] In one embodiment, the sealing seat is annular, an outer seal is provided on the outer ring side wall of the sealing seat, and an inner seal is provided on the inner ring side wall of the sealing seat; during online maintenance, the outer seal is sealed to the maintenance port, and the inner seal is sealed to the sealing disk.

[0023] As a further improvement, a pressure plate is fixedly connected to the sealing plate of the valve core for fixing the main sealing component.

[0024] As another improvement, an elastic pad is further provided between the valve body and the valve cover.

[0025] As another improvement, a valve seat is provided at the first opening near the valve cavity, and the main sealing member can be in sealing contact with the valve seat to correspondingly close the valve.

[0026] Compared with the prior art, the technical solution provided by this utility model has the following beneficial effects:

[0027] (1) The utility model provides an eccentric hemispherical valve that can be repaired online. During online repair, the main seal is rotated to the maintenance port, and the sealing seat is controlled to rotate to form an isolation chamber. The main seal can be repaired after the valve cover is removed. After the repair is completed, the sealing seat is rotated in the other direction to open the isolation chamber, and the valve cover is then installed to complete the repair process. The eccentric hemispherical valve in this solution has a simpler structure and a faster repair process.

[0028] (2) The utility model is an eccentric hemispherical valve that can be maintained online, and the drive assembly includes a connecting shaft and a drive part. The connecting shaft passes through the valve body and is connected to the side of the sealing seat near the second opening. The valve seat is provided near the first opening to the valve cavity to avoid interference between the valve core and the sealing seat during rotation.

[0029] (3) The utility model is an eccentric hemispherical valve that can be maintained online. The sealing seat is locked and positioned by connecting the second locking fitting part with the first locking fitting part. There is no need to set up other locking structures for locking, which makes it more convenient to lock and position the sealing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is the main view of the eccentric hemispherical valve;

[0031] Figure 2 This is the right view of the eccentric hemispherical valve;

[0032] Figure 3 for Figure 2 Sectional view of the AA section of the mid-eccentric hemispherical valve;

[0033] Figure 4 for Figure 3 A magnified view of the structure at point B in the middle;

[0034] Figure 5 This is a schematic diagram of the state where the sealing seat is rotated to open the isolation chamber;

[0035] Figure 6 For eccentric hemispherical valve Figure 1 ;

[0036] Figure 7 For eccentric hemispherical valve Figure 2 ;

[0037] Figure 8 It is an enlarged structural diagram of the driving member, locking disk and locking rod;

[0038] Figure 9 This is a schematic diagram of the position of the valve core and the sealing seat in the online maintenance state;

[0039] Figure 10 for Figure 9 Enlarged view of the structure at point C in the middle.

[0040] Description of labels:

[0041] 1. Valve body; 11. Valve cavity; 12. Valve seat; 13. First opening; 14. Second opening; 15. Maintenance port; 16. Valve core; 161. Main seal; 162. Pressure plate; 17. Valve shaft;

[0042] 2. Valve cover; 21. Elastic pad;

[0043] 31. Driving unit; 311. First connecting hole; 32. Locking disk; 321. First locking position; 322. Second locking position; 323. Limiting edge; 324. Avoidance hole; 33. Locking rod; 331. Locking protrusion; 34. Connecting shaft;

[0044] 4. Sealing seat; 41. Outer seal; 42. Inner seal. DETAILED DESCRIPTION

[0045] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings and embodiments.

[0046] The structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in this specification so as to facilitate understanding and reading by those familiar with this technology. They are not intended to limit the conditions under which the present invention can be implemented, and therefore have no substantive technical significance. Any structural modifications, changes in proportional relationships, or adjustments in size, without affecting the efficacy and objectives that can be achieved by the present invention, should still fall within the scope of the technical contents disclosed in the present invention.

[0047] The terms "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of description and are not intended to limit the scope of implementation. Changes or adjustments in their relative relationships should also be considered as the scope of implementation of this utility model without substantially changing the technical content. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to express other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those skilled in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances.

[0048] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, for the purposes of describing the embodiments of the present application herein.

[0049] The online-repairable eccentric hemispherical valve provided in this embodiment is primarily installed in pipelines conveying liquid media. The eccentric hemispherical valve incorporates an eccentric valve core, which, when rotated to different positions, can close the valve to cut off the flow of the medium, open the valve to allow the medium to flow, or adjust the flow rate. The liquid medium can be water, oil, or other fluid substances. For ease of illustration, this embodiment uses water as the liquid medium.

[0050] Combine Figure 1 、 Figure 2 and Figure 3 As shown, the online-maintainable eccentric hemispherical valve in this embodiment includes a valve body 1, a valve core 16, a sealing seat 4 and a drive assembly.

[0051] A valve cavity 11 is formed in the valve body 1. A first opening 13, a second opening 14 and a maintenance port 15 communicating with the valve cavity 11 are also provided on the valve body 1. The maintenance port 15 is sealed and connected to the detachable valve cover 2. Figure 3 As shown, specifically, the first opening 13 and the second opening 14 are respectively located on the left and right sides of the valve body 1 , and the first opening 13 and the second opening 14 are located on the same axis, and the maintenance port 15 is located on the upper side of the valve body 1 .

[0052] After the eccentric hemispheric valve is installed in a piping system, when liquid flows through the valve body 1, if the liquid flows from the first opening 13 to the second opening 14, the first opening 13 becomes the inlet and the second opening 14 becomes the outlet; if the liquid flows from the second opening 14 to the first opening 13, the second opening 14 becomes the inlet and the first opening 13 becomes the outlet. The specific configuration of the inlet and outlet of the valve body depends on the installation of the hemispheric valve in the piping system. For ease of explanation, this embodiment describes the first opening 13 as the inlet and the second opening 14 as the outlet. Liquid enters the valve through the first opening 13 and circulates through the valve.

[0053] The exterior of the maintenance port 15 is sealed against the valve cover 2 to prevent liquid leakage during valve operation. To improve the seal between the valve cover 2 and the valve body 1, an elastic gasket 21 is positioned between the valve body 1 and the valve cover 2. Bolts secure the valve cover 2 to the valve body 1, and the valve cover 2 can be removed by removing the bolts. When the bolts secure the valve cover 2 to the valve body 1, tightening the screws compresses the elastic gasket 21 between the valve body 1 and the valve cover 2, thereby improving the seal between the valve cover 2 and the valve body 1.

[0054] The valve core 16 is rotatably mounted within the valve chamber 11 and includes a sealing disk and a main seal 161 mounted on the sealing disk. The main seal 161 rotates with the valve core 16 and switches between the first opening 13 and the maintenance port 15. The valve core 16 is connected to a valve shaft 17, which passes through the valve body 1 and connects to an actuator outside the valve body 1. This actuator drives the valve core 16 in rotation. For example, the actuator can be a servo motor, which drives the valve core 16 in rotation. The main seal 161 is mounted on the sealing disk and provides a seal when the eccentric hemispherical valve is closed.

[0055] A pressure plate 162 is also fixedly connected to the sealing plate of the valve core 16, which is used to secure the main seal 161. The pressure plate 162 is detachably secured to the sealing plate. One side of the pressure plate 162 abuts against one side of the main seal 161, pressing against the main seal 161 and securing the main seal 161. When the main seal 161 needs to be replaced, the pressure plate 162 is removed, thereby removing the main seal 161. In this embodiment, the pressure plate 162 is secured to the sealing plate by bolts. Of course, in other embodiments, the pressure plate 162 may be secured to the sealing plate by other means.

[0056] Combine Figure 3 、 Figure 4 and Figure 5As shown, the sealing seat 4 is located within the maintenance port 15. The drive assembly is connected to the sealing seat 4 and can drive the sealing seat 4 to rotate. During online maintenance, the drive assembly drives the sealing seat 4 to rotate until it contacts and seals with the sealing disc. The sealing disc, sealing seat 4, and valve cover 2 form an isolation chamber at the maintenance port 15. The main seal 161 is located in the isolation chamber and can be inspected by removing the valve cover 2.

[0057] Specifically, the driving assembly includes a connecting shaft 34 and a driving part 31. One end of the connecting shaft 34 passes through the valve body 1 and is connected to the side of the sealing seat 4 close to the second opening 14, and the other end is connected to the driving part 31; the driving part 31 drives the connecting shaft 34 to rotate the sealing seat 4.

[0058] The side of the sealing seat 4 near the second opening 14 is connected to the connecting shaft 34. When the sealing seat 4 rotates, it rotates around the center of the connecting shaft 34. A valve seat 12 is provided near the valve chamber 11 at the first opening 13. The valve shaft 17 drives the valve core 16 to rotate, causing the valve core 16 to switch positions between the first opening 13 and the maintenance port 15. When the eccentric hemispherical valve is in operation, the actuator drives the valve core 16 to rotate to the maintenance port 15, establishing communication between the first opening 13 and the second opening 14. When the eccentric hemispherical valve is closed, the actuator drives the valve core 16 to rotate to the first opening 13. The main seal 161 contacts the valve seat 12 in a sealing manner, closing the first opening 13 and thus closing the eccentric hemispherical valve.

[0059] During the long-term operation of the eccentric hemispherical valve, the main seal 161 will age or wear, and the main seal 161 needs to be regularly maintained. In this embodiment, when the eccentric hemispherical valve is in normal online operation, the main seal 161 is maintained in an online maintenance manner. Specifically, when the eccentric hemispherical valve needs to be maintained online, the actuator drives the valve core 16 to rotate to the maintenance port 15, so that the axis of the sealing disk coincides with the axis of the maintenance port 15, and the drive assembly drives the sealing seat 4 to rotate until it contacts and seals with the sealing disk. The sealing disk, the sealing seat 4 and the valve cover 2 form an isolation chamber at the maintenance port 15, and the main seal 161 is located in the isolation chamber. The valve cover 2 can be disassembled to repair the main seal 161.

[0060] like Figure 3 As shown, when the eccentric hemispherical valve is maintained online, the main seal 161 rotates with the valve core 16 to the maintenance port 15, and the sealing seat 4 is controlled to rotate toward the valve core 16 to form an isolation chamber. The main seal 161 can be maintained after the valve cover 2 is removed. Figure 5 As shown, after the maintenance is completed, the sealing seat 4 is rotated in the direction away from the valve core 16 to open the isolation chamber, and then the valve cover 2 is installed to complete the maintenance process. The eccentric hemispherical valve in this solution has a simpler structure and a faster maintenance process.

[0061] It should be noted that in the eccentric hemispherical valve, Figure 5As shown, the first opening 13 and the second opening 14 are located on the same axis. A radial line on the valve shaft 17 perpendicular to the axis of the first opening 13 and the second opening 14 is the centerline aa, and the axis of the sealing disc of the valve core 16 is the centerline bb. In this embodiment, the sealing seat 4 is annular, specifically circular, and the axis of the sealing seat 4 and the second opening 14 coincide within the maintenance port 15. During online maintenance, the valve core 16 sealing disc is located within the maintenance port 15, and the centerline bb coincides with the axis of the maintenance port 15, and the centerline bb is offset to the side of the centerline aa closer to the second opening 14. The valve seat 12 is disposed at the first opening 13, and the connecting shaft 34 is connected to the side of the sealing seat 4 closer to the second opening 14. Figure 3 The middle diagram shows the state of the isolation chamber when the eccentric hemispherical valve is overhauled. After the overhaul is completed, the connecting shaft 34 rotates clockwise to open the isolation chamber, forming the following Figure 5 In the state shown, the valve operates normally. To close the valve, the valve shaft 17 drives the valve seat 12 to rotate counterclockwise, causing the main seal 161 to contact and seal the valve seat 12. When the valve core 16 rotates to switch between the first opening 13 and the maintenance port 15, the connecting shaft 34 must drive the sealing seat 4 to rotate to a position where the isolation chamber is fully open to prevent interference between the valve core 16 and the sealing seat 4 during rotation.

[0062] To improve the sealing of the isolation chamber during online maintenance, an outer seal 41 is provided on the outer sidewall of the sealing seat 4, and an inner seal 42 is provided on the inner sidewall of the sealing seat 4. Preferably, the outer seal 41 and the inner seal 42 are elastic O-rings. During online maintenance, the sealing seat 4 rotates until it contacts and seals the sealing disc. After the sealing disc, the sealing seat 4, and the valve cover 2 form an isolation chamber at the maintenance port 15, the outer seal 41 is sealed against the inner sidewall of the maintenance port 15, and the inner seal 42 is sealed against the sealing disc.

[0063] Combine Figure 6 、 Figure 7 and Figure 8 As shown, the driving portion 31 is a driving handle, which is provided with a first connecting hole 311 for fixed connection with the connecting shaft 34. The first connecting hole 311 can be configured as a square hole, and the end of the connecting shaft 34 is also configured as a square hole, which is connected to the first connecting hole 311, so that when the driving handle is rotated, the connecting shaft 34 is rotated synchronously. In other cases, the first connecting hole 311 can also be fixedly connected to the connecting shaft 34 by other means, as long as the connecting shaft 34 rotates synchronously with the driving handle.

[0064] During operation, the operator applies force to the driving handle, causing the driving handle to rotate, and the connecting shaft 34 rotates synchronously with the driving handle, thereby driving the sealing seat 4 to rotate. In other embodiments, the driving portion 31 can also be other, for example, the driving portion 31 can be an electric actuator, such as a servo motor; or a hydraulic actuator, such as a hydraulic cylinder; or a pneumatic actuator, such as a pneumatic cylinder.

[0065] Combine Figure 8 、 Figure 9 and Figure 10 As shown, the drive assembly preferably further includes a locking plate 32 and a locking rod 33. The locking plate 32 is fixed relative to the valve body 1 and is fixed to the valve body 1 by bolts. In other cases, the locking plate 32 can also be fixed to the valve body 1 by welding or other means. The connecting shaft 34 passes through the locking plate 32 and is connected to the drive unit 31; the locking rod 33 is located on the drive unit 31 and rotates with the drive unit 31. The locking plate 32 defines a clearance hole 324. The diameter of the clearance hole 324 is larger than the diameter of the connecting shaft 34. When the connecting shaft 34 passes through the locking plate 32, it passes through the clearance hole 324.

[0066] The locking disc 32 is provided with a first locking engagement portion, and the locking lever 33 is provided with a second locking engagement portion. When the locking lever 33 rotates with the driving portion 31, the second locking engagement portion can selectively engage with the first locking engagement portion to lock the sealing seat 4 in place. When the locking lever 33 rotates with the driving portion 31 to the point where the sealing seat 4 is locked and positioned, the second locking engagement portion engages with the first locking engagement portion. When the sealing seat 4 is not in the locked position, the second locking engagement portion disengages from the first locking engagement portion as the locking lever 33 rotates with the driving portion 31, canceling the locking action.

[0067] Specifically, the first locking portion includes a first locking position 321 and a second locking position 322, and the second locking portion includes a locking protrusion 331. When the locking protrusion 331 is rotated to engage with the first locking position 321, the sealing seat 4 is locked in a position in contact with the sealing disk for sealing; when the locking protrusion 331 is rotated to engage with the second locking position 322, the sealing seat 4 is locked in a position in which the isolation chamber is fully opened.

[0068] Combine Figure 10As shown, the locking rod 33 is arc-shaped and can be connected to the driving part 31 via a pin. A locking protrusion 331 is provided at one end of the locking rod 33, and the other end is close to the handle of the driving part 31. Under normal circumstances, the valve operates normally, the isolation chamber is in a fully open state, and the locking protrusion 331 is engaged with the second locking position 322. When online maintenance is required, force is applied to the end of the locking rod 33 close to the handle of the driving part 31 to disengage the locking protrusion 331 from the second locking position 322. The driving part 31 is rotated to drive the sealing seat 4 to rotate until it contacts and seals with the sealing disk. The locking protrusion 331 follows the locking rod 33 and the driving part 31 to rotate to the first locking position 321 and engages with the first locking position 321. During online maintenance, the locking protrusion 331 cooperates with the first locking position 321 to lock the sealing seat 4 in a position in contact with the sealing disk to prevent the sealing seat 4 from loosening from the sealing disk; during normal operation of the valve, the locking protrusion 331 cooperates with the second locking position 322 to lock the sealing seat 4 in a position in which the isolation chamber is fully opened to prevent the sealing seat 4 from rotating toward the direction close to the valve core 16, which would cause interference between the valve core 16 and the sealing seat 4 when the valve core 16 rotates.

[0069] In other embodiments, the first locking fitting portion may also be configured as two locking protrusions, and the second locking fitting portion may be configured as a locking position capable of cooperating with the locking protrusions.

[0070] In addition, the locking disk 32 is further provided with limiting edges 323 , which are located on both sides of the first locking fitting portion. The limiting edges 323 are used to limit the driving portion 31 to prevent the driving portion 31 from rotating too much.

[0071] The online-maintainable eccentric hemispherical valve of this solution drives the seal seat 4 to rotate by controlling the drive unit 31 outside the valve body 1, forming an isolation chamber at the maintenance port 15. The main seal 161 can be repaired by removing the valve cover 2, simplifying the valve structure and facilitating maintenance of the main seal 161. Furthermore, the seal seat 4 is locked and positioned by the second locking mating portion mating with the first locking mating portion, eliminating the need for additional locking structures, making locking and positioning of the seal seat 4 even more convenient.

[0072] The terms "installed," "disposed," "equipped with," and "connected" as used herein should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0073] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. An eccentric hemispherical valve capable of online maintenance, comprising: A valve body (1), wherein a valve cavity (11) is provided in the valve body (1), and the valve body (1) is further provided with a first opening (13), a second opening (14) and a maintenance port (15) communicating with the valve cavity (11), and the maintenance port (15) is externally sealed and connected to a detachable valve cover (2); A valve core (16) is rotatably mounted in the valve cavity (11), comprising a sealing disk and a main sealing member (161) disposed on the sealing disk, wherein the main sealing member (161) is capable of rotating with the valve core (16) and switching positions between the first opening (13) and the maintenance port (15); It is characterized by further comprising: A sealing seat (4) is located in the maintenance port (15); a driving assembly connected to the sealing seat (4) and capable of driving the sealing seat (4) to rotate; During online maintenance, the driving assembly drives the sealing seat (4) to rotate until it contacts and seals with the sealing disk. The sealing disk, the sealing seat (4) and the valve cover (2) form an isolation chamber at the maintenance port (15). The main sealing member (161) is located in the isolation chamber. The main sealing member (161) can be inspected by disassembling the valve cover (2).

2. The eccentric hemispherical valve capable of online maintenance according to claim 1, characterized in that: The driving assembly comprises a connecting shaft (34) and a driving portion (31); one end of the connecting shaft (34) passes through the valve body (1) and is connected to a side of the sealing seat (4) close to the second opening (14), and the other end is connected to the driving portion (31); the driving portion (31) drives the connecting shaft (34) to rotate the sealing seat (4).

3. The eccentric hemispherical valve capable of online maintenance according to claim 2, characterized in that: The driving portion (31) is a driving handle, and a first connecting hole (311) is provided on the driving handle for fixed connection with the connecting shaft (34).

4. The eccentric hemispherical valve capable of online maintenance according to claim 2, characterized in that: The driving assembly further comprises a locking disc (32) and a locking rod (33); the locking disc (32) is fixedly arranged relative to the valve body (1); the connecting shaft (34) passes through the locking disc (32) and is connected to the driving portion (31); the locking rod (33) is located on the driving portion (31) and rotates with the driving portion (31); A first locking fitting portion is provided on the locking disk (32), and a second locking fitting portion is provided on the locking rod (33). When the locking rod (33) rotates following the driving portion (31), the second locking fitting portion can be selectively connected to the first locking fitting portion to lock and position the sealing seat (4).

5. The eccentric hemispherical valve capable of online maintenance according to claim 4, characterized in that: The first locking fitting portion includes a first locking position (321) and a second locking position (322); the second locking fitting portion includes a locking protrusion (331); When the locking protrusion (331) is rotated to be engaged with the first locking position (321), the sealing seat (4) can be locked in a position where it contacts and seals with the sealing disk; When the locking protrusion (331) is rotated to be in cooperative connection with the second locking position (322), the sealing seat (4) can be locked in a position where the isolation cavity is fully opened.

6. The eccentric hemispherical valve capable of online maintenance according to claim 4, characterized in that: The locking disk (32) is further provided with limiting edges (323), the limiting edges (323) being located on both sides of the first locking fitting portion, and the limiting edges (323) being used to limit the driving portion (31).

7. The eccentric hemispherical valve capable of online maintenance according to any one of claims 1 to 6, characterized in that: The sealing seat (4) is annular, and an outer sealing member (41) is provided on the outer ring side wall of the sealing seat (4), and an inner sealing member (42) is provided on the inner ring side wall of the sealing seat (4); during online maintenance, the outer sealing member (41) is sealedly connected to the maintenance port (15), and the inner sealing member (42) is sealedly connected to the sealing disk.

8. The eccentric hemispherical valve capable of online maintenance according to claim 7, characterized in that: The sealing disc of the valve core (16) is also fixedly connected to a pressure disc (162) for fixing the main sealing component (161).

9. The eccentric hemispherical valve capable of online maintenance according to claim 7, characterized in that: An elastic pad (21) is also provided between the valve body (1) and the valve cover (2).

10. The eccentric hemispherical valve capable of online maintenance according to claim 7, characterized in that: A valve seat (12) is provided near the valve cavity (11) at the first opening (13), and the main sealing member (161) can be in sealing contact with the valve seat (12) to close the valve accordingly.

Images