Eccentric semi-ball valve

Abstract

A valve cavity is formed in a valve body, and a maintenance opening is formed in the valve body; the valve element is rotatably installed in the valve cavity and comprises a sealing disc and a first main sealing ring arranged on the sealing disc, and the first main sealing ring can rotate along with the valve element. The telescopic valve seat is provided with an inner end and an outer end, and the inner end extends into the maintenance opening; the outer end of the telescopic valve seat is located outside the maintenance opening and connected with the valve body through a driving assembly, and the driving assembly can drive the telescopic valve seat to move. An opening in the outer end of the telescopic valve seat is hermetically connected with a detachable valve cover; during online maintenance, the driving assembly drives the telescopic valve seat to move to be in contact sealing with the sealing disc, the sealing disc, the telescopic valve seat and the valve deck form an isolation cavity at the maintenance opening, the first main sealing ring is located in the isolation cavity, and the first main sealing ring can be maintained by disassembling the valve deck. The valve can be overhauled on line, and the valve cover is more convenient to disassemble, so that the valve is overhauled more quickly.

Description

Technical Field

[0001] The utility model relates to the technical field of eccentric valves, and more specifically, to an eccentric semi-spherical valve. Background Art

[0002] As a key component in a pipeline system, a valve is mainly used to control the flow of fluids. In multiple fields such as industry, urban water supply, and energy, the valve plays an important role in switching, regulating, and distributing fluids. An eccentric semi-spherical valve is a valve with a special design. It has an eccentrically rotating closing member and can achieve efficient and precise control in a fluid system. During the long-term use of traditional eccentric semi-spherical valves, their sealing rings may wear or be damaged, resulting in valve leakage. In some application scenarios where water supply interruption is not allowed, replacing a damaged sealing ring requires shutting off the water supply and closing the valves before and after the pipeline. This not only affects the continuous operation of the system but may also cause economic losses and resource waste.

[0003] In order not to stop the system operation, valves that can perform on-line maintenance while the pipeline system is running normally are often used. After retrieval, the publication number CN219866371U discloses an eccentric semi-spherical valve, which includes a valve body, a valve shaft, and a semi-spherical valve flap. A second valve port is opened on the valve body, and the interior of the valve body serves as a valve cavity; a first sealing member is provided on the outer side of the semi-spherical valve flap; the valve shaft drives the semi-spherical valve flap to rotate to control the shut-off of the valve, corresponding to opening and closing the eccentric semi-spherical valve; a valve cover is provided at the outer end of the second valve port, and a liftable sealing valve seat is provided inside it; the liftable sealing valve seat includes an upper valve seat and a lower valve seat. After the eccentric semi-spherical valve is fully opened, the lower valve seat can descend to abut and seal with the semi-spherical valve flap, so that a sealed pressure chamber is formed between the valve cover and the semi-spherical valve flap; and the first sealing member is located in this sealed pressure chamber. Opening this sealed pressure chamber can replace or overhaul the first sealing member.

[0004] In this eccentric semi-spherical valve, a sealed pressure chamber is formed between the lower valve seat, the semi-spherical valve flap, and the valve cover. This sealed pressure chamber is isolated from the cavity through which the fluid flows in the valve body, so that the valve can overhaul or replace the internal sealing components or other vulnerable parts without interrupting the fluid flow. However, in this solution, when opening the sealed pressure chamber to replace or overhaul the first sealing member, it is necessary to remove components such as the valve cover, the upper valve seat, and the support beam plate. There are many components involved in the disassembly and assembly process, and the overhaul process is complex, which is not conducive to the on-line rapid overhaul of the valve. Summary of the Invention

[0005] The utility model provides an eccentric semi-spherical valve, which can perform on-line overhaul of the valve and is more convenient to disassemble the valve cover, making the overhaul of the valve faster.

[0006] To achieve the above object, the technical solution provided by the utility model is as follows:

[0007] An eccentric semi-spherical valve, comprising

[0008] a valve body, within which a valve cavity is provided, and a first opening, a second opening and a maintenance port which are all communicated with the valve cavity are further formed on the valve body;

[0009] a valve core, rotatably installed in the valve cavity, including a sealing disc and a first main sealing ring arranged on the sealing disc, and the first main sealing ring can rotate with the valve core and switch positions among the first opening, the second opening and the maintenance port;

[0010] a telescopic valve seat, having an inner end and an outer end, and the inner end extends into the maintenance port and is hermetically connected thereto;

[0011] the outer end of the telescopic valve seat is located outside the maintenance port and is connected to the valve body through a driving assembly, and the driving assembly can drive the telescopic valve seat to axially move along the maintenance port;

[0012] a detachable valve cover is hermetically connected to the outer end opening of the telescopic valve seat;

[0013] During on-line maintenance, the driving assembly drives the telescopic valve seat to move into contact and seal with the sealing disc, and the sealing disc, the telescopic valve seat and the valve cover form an isolation cavity at the maintenance port, and the first main sealing ring is located in the isolation cavity, and the first main sealing ring can be overhauled by disassembling the valve cover.

[0014] As a further improvement, the outer end of the telescopic valve seat has a first connection position which is arranged to avoid the driving assembly, the valve cover has a second connection position which is also arranged to avoid the driving assembly, and the positions of the first connection position and the second connection position correspond to each other and are connected by a fixing member.

[0015] In a preferred embodiment, the first connection position is a second fixing step which is circumferentially arranged on the inner side of the outer end of the telescopic valve seat, the second connection position is a third fixing step which is circumferentially arranged on the side of the valve cover, and the third fixing step overlaps on the second fixing step.

[0016] Further, the fixing member includes a snap ring and a fixing ring, the snap ring is located outside the third fixing step and is embedded on the telescopic valve seat; the snap ring includes at least two split snap rings, and each split snap ring is fixedly connected to the fixing ring together.

[0017] In another embodiment, the fixing member is a bolt or a screw rod which passes through the third fixing step and the second fixing step.

[0018] In another embodiment, the first connection position is a connection hole formed on the outer end face of the telescopic valve seat, and the second connection position is a valve cover connection hole formed on the valve cover and corresponding to the position of the connection hole; the fixing member is a bolt or a screw rod, and the fixing member passes through the connection hole and the valve cover connection hole for fixed connection.

[0019] In one embodiment, a first fixing step protrudes circumferentially on the outer side of the outer end of the telescopic valve seat. The driving assembly includes a connecting member and a locking member threadedly connected to the connecting member. One end of the connecting member passes through the first fixing step, and the other end is connected to the valve body; the locking member includes a first locking member and a second locking member, and the first locking member and the second locking member are respectively located on both sides of the first fixing step.

[0020] Further, the valve body includes a fixed valve cover, the fixed valve cover is located outside the maintenance port, and the fixed valve cover has an opening corresponding to the telescopic valve seat.

[0021] Further, a second main sealing ring is circumferentially arranged on the inner side of the inner end of the telescopic valve seat. The second main sealing ring can contact the sealing disc to form a seal; the telescopic valve seat and the second main sealing ring are integrally connected by vulcanization.

[0022] Further, a pressure relief valve is also connected to the valve cover.

[0023] Adopting the technical solution provided by the present utility model, compared with the prior art, it has the following beneficial effects:

[0024] The eccentric semi-spherical valve of the present utility model adopts a double-sealing structure. The first main sealing ring is arranged on the valve core, and the opening and closing of the valve are realized through the first main sealing ring. When on-line maintenance is required, the telescopic valve seat moves, so as to contact and seal with the sealing disc to form an isolation cavity. Opening the isolation cavity can repair and replace the first main sealing ring. Once the first main sealing ring of the valve is worn or damaged and the valve leaks, the worn or damaged first main sealing ring can be replaced without stopping the water supply, so there is no need to remove the valve for maintenance, and there is no need to stop the water supply for maintenance, which greatly reduces the maintenance cost of customers and achieves the purpose of energy conservation, emission reduction, low-carbon environmental protection. Moreover, during on-line maintenance, the driving assembly drives the telescopic valve seat to move, so that the sealing disc, the telescopic valve seat and the valve cover form an isolation cavity. The valve cover and the telescopic valve seat are detachably connected, and the valve cover can be quickly disassembled and the isolation cavity can be quickly opened, so that the repair and replacement of the first main sealing ring are more rapid. In addition, the driving assembly only drives the connection of the telescopic valve seat, making it more labor-saving when the driving assembly drives the telescopic valve seat to move.

[0025] Other technical problems that can be solved by the eccentric semi-spherical valve of the present utility model, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail with reference to the accompanying drawings. Brief Description of the Drawings

[0026] Figure 1 Schematic diagram of the overall structure of the eccentric semi-spherical valve provided for Embodiment 1 Figure 1 ;

[0027] Figure 2 Schematic diagram of the overall structure of the eccentric semi-spherical valve provided for Embodiment 1 Figure 2 ;

[0028] Figure 3 Schematic diagram of the telescopic valve seat structure;

[0029] Figure 4 Top view of the eccentric semi-spherical valve provided for Embodiment 1;

[0030] Figure 5 For Figure 4 Sectional view A-A of the eccentric semi-spherical valve in

[0031] Figure 6 For Figure 5 Enlarged view of the structure at B in

[0032] Figure 7 Schematic diagram of the valve core structure.

[0033] Label Description:

[0034] 1. Valve body; 11. First opening; 12. Second opening; 13. Valve cavity; 14. Maintenance port; 2. Valve core; 21. First main seal ring; 22. Sealing disc; 23. Pressure disc; 24. Front shaft hole; 25. Rear shaft hole; 3. Fixed valve cover; 31. Boss; 4. Telescopic valve seat; 41. First fixed step; 42. Second fixed step; 43. Groove; 44. Connecting hole; 45. Second main seal ring; 5. Valve cover; 51. Snap ring; 52. Fixed ring; 53. Pressure relief valve; 54. Third fixed step; 6. Driving assembly; 60. Connecting piece; 61. First locking piece; 62. Second locking piece; 7. Actuating assembly. Detailed Description of the Preferred Embodiments

[0035] To further understand the content of the present utility model, the present utility model will be described in detail with reference to the accompanying drawings and embodiments.

[0036] The structures, proportions, sizes, etc. shown in the attached drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in this technology to understand and read, and are not used to limit the implementation conditions of the present utility model. Therefore, they do not have any substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model.

[0037] At the same time, terms such as "upper", "lower", "left", "right", "inner", "outer", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented. Moreover, in addition to being able to represent the orientation or positional relationship, some of the above terms may also be used to represent other meanings. For example, the term "upper" may also be used to represent a certain attachment relationship or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0038] It should be noted that the terms "first", "second", etc. in the specification, claims and the above-mentioned attached drawings of this application are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances for the embodiments of this application described here.

[0039] Embodiment 1

[0040] The eccentric semi-spherical valve is mainly used to be installed on the pipeline for transporting liquid media and is used for truncating or connecting pipelines in the pipeline system. A valve core is arranged inside the eccentric semi-spherical valve. When the valve core rotates to different positions, it can close the ball valve to cut off the flow of the medium, or open the ball valve to allow the medium to flow through. In some cases, it can also adjust the flow rate.

[0041] Combined Figure 1 and Figure 2 As shown, this embodiment provides an eccentric semi-spherical valve, which includes a valve body 1, a valve core 2, a telescopic valve seat 4 and a valve cover 5. Wherein, a valve cavity 13 is arranged inside the valve body 1, and a first opening 11, a second opening 12 and a maintenance opening 14 that are all communicated with the valve cavity 13 are also opened on the valve body 1. Taking Figure 1 the middle view orientation as an example, specifically, the first opening 11 and the second opening 12 are respectively located on the left and right sides of the valve body 1, and the first opening 11 and the second opening 12 are located on the same axis. The maintenance opening 14 is located on the upper side of the valve body 1.

[0042] After the eccentric semi-spherical valve is installed in the pipeline system, when there is liquid flow in the valve body 1, if the liquid flows from the first opening 11 to the second opening 12, the first opening 11 is the inlet and the second opening 12 is the outlet; if the liquid flows from the second opening 12 to the first opening 11, the second opening 12 is the inlet and the first opening 11 is the outlet. The settings of the inlet and outlet of the specific valve body are determined according to the installation of the semi-spherical valve in the pipeline system. For the convenience of description, in this embodiment, the first opening 11 is taken as the inlet and the second opening 12 is taken as the outlet for description.

[0043] Combined with Figure 7 As shown, the valve core 2 is rotatably installed in the valve cavity 13. The valve core 2 includes a sealing disc 22 and a first main sealing ring 21 arranged on the sealing disc 22. The first main sealing ring 21 can rotate with the valve core 2 and switch positions between the first opening 11, the second opening 12, and the maintenance port 14. The front shaft hole 24 and the rear shaft hole 25 are coaxially arranged at both ends of the valve core 2. Valve shafts are respectively arranged in the front shaft hole 24 and the rear shaft hole 25. The valve core 2 is connected to the valve body 1 through the valve shafts. The valve shaft in the front shaft hole 24 passes through the valve body 1 to the outside of the valve body 1 and is connected to the actuator assembly 7. The actuator assembly 7 drives the valve core 2 to rotate. For example, the actuator assembly 7 can adopt a servo motor to drive the valve core 2 to rotate. The first main sealing ring 21 is arranged on the sealing disc 22 and is used for sealing when the eccentric semi-spherical valve is closed.

[0044] The valve core 2 further includes a pressure plate 23. The pressure plate 23 is detachably fixed on the sealing disc 22. One side of the pressure plate 23 abuts against one side of the first main sealing ring 21 and presses the first main sealing ring 21 to fix the first main sealing ring 21. When the first main sealing ring 21 needs to be replaced, the pressure plate 23 is removed, and thus the first main sealing ring 21 is removed. In this embodiment, the pressure plate 23 is fixed to the sealing disc 22 by bolts. Of course, in other embodiments, the pressure plate 23 can be fixed to the sealing disc 22 by other means.

[0045] Combined with Figure 4 and Figure 5 As shown, the telescopic valve seat 4 has an inner end and an outer end. The inner end of the telescopic valve seat 4 extends into the maintenance port 14 and is hermetically connected to the maintenance port 14; the outer end of the telescopic valve seat 4 is located outside the maintenance port 14 and is connected to the valve body 1 through the drive assembly 6. The drive assembly 6 can drive the telescopic valve seat 4 to move axially along the maintenance port 14. A detachable valve cover 5 is hermetically connected to the outer end opening of the telescopic valve seat 4. The valve cover 5 and the telescopic valve seat 4 are directly connected through a fixing member. After the valve cover 5 and the telescopic valve seat 4 are fixedly connected, an O-ring can be arranged between the valve cover 5 and the telescopic valve seat 4 to realize the sealing connection between the valve cover 5 and the telescopic valve seat 4.

[0046] When the eccentric semi-spherical valve operates normally, the actuating assembly 7 drives the valve core 2 to rotate to the maintenance port 14, so that the first opening 11 and the second opening 12 are communicated. When the eccentric semi-spherical valve is closed, the actuating assembly 7 drives the valve core 2 to rotate to the first opening 11, and the sealing disc 22 and the first main sealing ring 21 seal the first opening 11, so that the eccentric semi-spherical valve is closed.

[0047] During the long-term operation of the eccentric semi-spherical valve, the first main sealing ring 21 will age or wear, and it is necessary to regularly overhaul the first main sealing ring 21. In this embodiment, when the eccentric semi-spherical valve operates normally online, the first main sealing ring 21 is overhauled in an online maintenance manner. Specifically, when the eccentric semi-spherical valve needs online maintenance, the actuating assembly 7 drives the valve core 2 to rotate to the maintenance port 14, so that the axis line of the sealing disc 22 coincides with the axis line of the maintenance port 14, and the driving assembly 6 drives the telescopic valve seat 4 to move to contact and seal with the sealing disc 22. The sealing disc 22, the telescopic valve seat 4 and the valve cover 5 form an isolation cavity at the maintenance port 14. The first main sealing ring 21 is located in the isolation cavity, and the first main sealing ring 21 can be overhauled by disassembling the valve cover 5, and the first main sealing ring 21 can be replaced.

[0048] In this embodiment, the valve cover 5 and the telescopic valve seat 4 are directly connected by fixing parts, and the telescopic valve seat 4 moves downward (described in terms of the Figure 5 viewing orientation), contacts and seals with the sealing disc 22. The sealing disc 22, the telescopic valve seat 4 and the valve cover 5 can form an isolation cavity, and the isolation cavity can be opened only by disassembling the valve cover 5, so as to overhaul and replace the first main sealing ring 21, making the valve overhaul more rapid and convenient.

[0049] Furthermore, the outer end of the telescopic valve seat 4 has a first connection position and the first connection position is arranged to avoid the driving assembly 6, and the valve cover 5 has a second connection position and the second connection position is also arranged to avoid the driving assembly 6. The positions of the first connection position and the second connection position correspond to each other and are connected by fixing parts, so that the valve cover 5 is connected to the telescopic valve seat 4 after avoiding the driving assembly 6. The driving assembly 6 is only drivingly connected to the telescopic valve seat 4, making it more labor-saving when the driving assembly 6 drives the telescopic valve seat 4 to move.

[0050] Specifically, as shown in Figure 2 、 Figure 3 、 Figure 5 and Figure 6 , the first connection position is the second fixing step 42 arranged circumferentially on the inner side of the outer end of the telescopic valve seat 4, and the second connection position is the third fixing step 54 arranged circumferentially on the side of the valve cover 5. The third fixing step 54 overlaps on the second fixing step 42 and is fixedly connected together by fixing parts.

[0051] As a further improvement, the fixing member includes a snap ring 51 and a fixing ring 52. The snap ring 51 is located outside the third fixing step 54 and is fitted on the telescopic valve seat 4. The snap ring 51 includes four split snap rings, and each split snap ring is fixedly connected to the fixing ring 52. As shown in Figure 3 In the figure, a groove 43 is recessed on the inner side of the telescopic valve seat 4. The groove 43 is arranged along the circumferential direction of the inner side of the telescopic valve seat 4 and is located above the second fixing step 42. Each split snap ring is in an arc shape, and the four split snap rings enclose to form the snap ring 51. The split snap rings are fitted in the groove 43, and a certain gap is provided between adjacent split snap rings to allow the split snap rings to have room for movement, so that the split snap rings can be removed. One side of the snap ring 51 is fitted in the groove 43, and the other side extends out and presses against the third fixing step 54. At the same time, the fixing ring 52 fixedly connects each split snap ring. The fixing ring 52 is in an integral circular ring shape and can fix the split snap ring 51, so that the third fixing step 54 and the second fixing step 42 are fixedly connected together. In other embodiments, the snap ring 51 may also be provided with two, three or other numbers of split snap rings. In this embodiment, each split snap ring is fixed to the fixing ring 52 by bolts. Of course, in other embodiments, each split snap ring can be fixed to the fixing ring 52 by other means.

[0052] Combined with Figure 1 、 Figure 2 and Figure 6 shown, a first fixing step 41 is protruded circumferentially on the outer side of the outer end of the telescopic valve seat 4. The driving assembly 6 includes a connecting member 60 and a locking member threadedly connected to the connecting member 60. One end of the connecting member 60 passes through the first fixing step 41, and the other end is connected to the valve body 1. The locking member includes a first locking member 61 and a second locking member 62. The first locking member 61 and the second locking member 62 are respectively located on both sides of the first fixing step 41. Specifically, the second locking member 62 is located above the first fixing step 41, and the first locking member 61 is located below the first fixing step 41.

[0053] As a preferred embodiment, the connecting member 60 is a bolt, the first locking member 61 and the second locking member 62 are nuts, the connecting member 60 is provided with 12, and the connecting member 60 is arranged in a central array around the telescopic valve seat 4. When the eccentric semi-spherical valve operates normally, the telescopic valve seat 4 is located at the maximum distance where it can move upward. This distance needs to ensure that the valve core 2 can rotate normally to realize the opening and closing of the valve. During normal operation, a part of the first locking members 61 located below the first fixing step 41 need to be tightened to be close to the first fixing step 41 to lock the first fixing step 41 to prevent the telescopic valve seat 4 from sliding down to hinder the rotation of the valve core 2. For example, four symmetric first locking members 61 are tightened to be close to the first fixing step 41. In other embodiments, the connecting member 60 may also be provided with other numbers; during normal operation, other numbers of the first locking members 61 may also be tightened to be close to the first fixing step 41.

[0054] The valve body 1 includes a fixed valve cover 3 which is located outside the maintenance port 14, and the fixed valve cover 3 has an opening corresponding to the telescopic valve seat 4. In one case, the fixed valve cover 3 is an independent component and is fixedly connected to the maintenance port 14 by bolts; in another case, the fixed valve cover 3 is integrally formed in the valve body 1.

[0055] Specifically, one end of the connecting member 60 is threadedly connected to the fixed valve cover 3, and a boss 31 is protruded at intervals on one side of the fixed valve cover 3, and the connecting member 60 is connected to the boss 31. By providing the boss 31, the connection length between the connecting member 60 and the fixed valve cover 3 can be increased, making the connecting member 60 more firmly installed on the fixed valve cover 3.

[0056] A second main sealing ring 45 is circumferentially arranged on the inner side of the inner end of the telescopic valve seat 4. The second main sealing ring 45 can contact the sealing disc 22 to form a seal, so that the sealing disc 22, the telescopic valve seat 4 and the valve cover 5 can form an isolation chamber. In a preferred embodiment, the telescopic valve seat 4 and the second main sealing ring 45 are integrally connected by vulcanization, making the telescopic valve seat 4 and the second main sealing ring 45 firmly glued together to form a whole. In other embodiments, the telescopic valve seat 4 and the second main sealing ring 45 can also be connected by other means.

[0057] See Figure 1 , a pressure relief valve 53 is also connected to the valve cover 5. Before disassembling the valve cover 5, the pressure can be relieved first through the pressure relief valve 53.

[0058] O-ring seals are provided between the outside of the telescopic valve seat 4 and the inside of the fixed valve cover 3, and between the valve cover 5 and the telescopic valve seat 4 for sealing. When the fixed valve cover 3 is provided separately, an O-ring seal is also provided between the fixed valve cover 3 and other parts of the valve body 1 for sealing.

[0059] The steps for overhauling and replacing the first main sealing ring 21 in the eccentric semi-spherical valve are as follows.

[0060] (1) When the first main sealing ring 21 needs to be overhauled, the actuator assembly 7 drives the valve core 2 to rotate the sealing disc 22 to the maintenance port 14.

[0061] (2) Turn the first locking member 61 close to the first fixed step 41 so that this part of the first locking member 61 contacts the boss 31 on the fixed valve cover 3.

[0062] (3) Then, successively rotate the second locking member 62 located above the expansion valve seat 4 downward to drive the expansion valve seat 4 to move downward until the second main sealing ring 45 contacts and seals the radial outer side of the sealing disc 22. At this time, stop rotating the second locking member 62 downward. At this moment, an isolation chamber is formed at the maintenance port 14 by the sealing disc 22, the expansion valve seat 4 and the valve cover 5, and the first main sealing ring 21 is located inside the isolation chamber. First, relieve the pressure in the isolation chamber through the pressure relief valve 53 on the valve cover 5 to confirm that the seal between the second main sealing ring 45 and the sealing disc 22 is good. Usually, the way to confirm that the seal between the second main sealing ring 45 and the sealing disc 22 is good is to observe whether water continuously flows out of the pressure relief valve 53 after pressure relief. If not, it means that the seal between the second main sealing ring 45 and the sealing disc 22 is good.

[0063] (4) Successively disassemble the fixing ring 52 and the snap ring 51, and then open the valve cover 5.

[0064] (5) Then disassemble the pressure plate 23 to remove the first main sealing ring 21 and perform maintenance and replacement on the first main sealing ring 21.

[0065] (6) Then reinstall the first main sealing ring 21 after maintenance and replacement, and install the pressure plate 23.

[0066] (7) Then successively install the valve cover 5, the snap ring 51 and the fixing ring 52, and close the pressure relief valve 53.

[0067] (8) Rotate the second locking member 62 above the expansion valve seat 4 upward to the maximum distance that the expansion valve seat 4 can move upward. Finally, use the pressure in the pipeline to push the valve cover 5 and drive the expansion valve seat 4 to move upward to the second locking member 62. Then rotate the first locking member 61 at the symmetric position below the expansion valve seat 4 to lock the expansion valve seat 4 to prevent the expansion valve seat 4 from slipping. Finally, complete the whole process of maintenance and replacement of the first main sealing ring 21.

[0068] During on-line maintenance, rotating the second locking member 62 downward can make the expansion valve seat 4 move downward. During the maintenance process, the second locking member 62 also limits and locks the expansion valve seat 4 to prevent the expansion valve seat 4 from moving upward during the maintenance process. After the maintenance is completed, rotate the second locking member 62 upward to the specified position. The expansion valve seat 4 moves upward to the second locking member 62 under the pressure in the pipeline, and the second locking member 62 also plays a limiting role on the expansion valve seat 4 at the same time. In addition, the connecting member 60 connects the expansion valve seat 4 and the valve body 1 and also plays a guiding role on the moving expansion valve seat 4.

[0069] In the eccentric semi-spherical valve of this embodiment, a double-sealing structure is adopted. When the eccentric semi-spherical valve is closed, the first main sealing ring 21 seals the first opening 11 to close the valve, and the opening and closing of the valve are realized through the first main sealing ring 21. When on-line maintenance is required, the telescopic valve seat 4 moves, driving the second main sealing ring 45 to contact the sealing disc 22 to form an isolation cavity. Opening the isolation cavity enables the inspection and replacement of the first main sealing ring 21. Once the first main sealing ring 21 of the valve is worn or damaged and the valve leaks, the worn or damaged first main sealing ring 21 can be replaced without shutting off the water. Moreover, during on-line maintenance, the driving assembly 6 drives the telescopic valve seat 4 to move, so that the sealing disc 22, the telescopic valve seat 4 and the valve cover 5 form an isolation cavity. The valve cover 5 is connected to the telescopic valve seat 4 through a fixing member, and the valve cover 5 can be removed only by disassembling the fixing member, realizing the quick disassembly of the valve cover 5 and the quick opening of the isolation cavity, thus making the inspection and replacement of the first main sealing ring 21 more rapid. In addition, the driving assembly 6 only drives and connects the telescopic valve seat 4, making it more labor-saving when the driving assembly 6 drives the telescopic valve seat 4 to move.

[0070] Embodiment 2

[0071] In the eccentric semi-spherical valve provided in this embodiment, the fixing member is a bolt or a screw rod passing through the third fixing step 54 and the second fixing step 42.

[0072] The other structures of the eccentric semi-spherical valve are the same as those in Embodiment 1.

[0073] In this embodiment, when the telescopic valve seat 4 moves downward and the second main sealing ring 45 contacts and seals the radial outer side of the sealing disc 22, an isolation cavity is formed at the maintenance port 14 by the sealing disc 22, the telescopic valve seat 4 and the valve cover 5. By removing the bolt or screw rod connecting the third fixing step 54 and the second fixing step 42, the valve cover 5 can be opened, realizing the quick disassembly of the valve cover 5 and the quick opening of the isolation cavity. After the inspection and replacement of the first main sealing ring 21 are completed, a bolt or a screw rod is installed between the third fixing step 54 and the second fixing step 42 to complete the installation of the valve cover 5.

[0074] Embodiment 3

[0075] In the eccentric semi-spherical valve provided in this embodiment, the first connection position is a connection hole 44 opened on the outer end face of the telescopic valve seat 4, and the second connection position is a valve cover connection hole opened on the valve cover 5 and corresponding to the position of the connection hole 44; the fixing member is a bolt or a screw rod, and the fixing member passes through the connection hole 44 and the valve cover connection hole for fixed connection.

[0076] In this embodiment, the valve cover 5 is disposed on the upper side of the outer end of the telescopic valve seat 4. In some cases, interference may occur between the valve cover 5 and the driving assembly 6. At this time, an avoidance hole for avoiding the driving assembly 6 needs to be formed in the valve cover 5, and the inner diameter of the avoidance hole should be larger than the outer diameter of the second locking member 62. The size of the avoidance hole formed should also reserve a space for screwing onto the second locking member 62.

[0077] Other structures of the eccentric semi-spherical valve are the same as those in Embodiment 1.

[0078] In this embodiment, when the telescopic valve seat 4 moves downward and the second main sealing ring 45 contacts and seals the radial outer side of the sealing disc 22, an isolation chamber is formed at the maintenance port 14 by the sealing disc 22, the telescopic valve seat 4 and the valve cover 5. By removing the fixing member between the connection hole 44 and the valve cover connection hole, the valve cover 5 can be opened. This realizes the quick disassembly of the valve cover 5 and the quick opening of the isolation chamber. After the first main sealing ring 21 is repaired and replaced, a fixing member is installed between the connection hole 44 and the valve cover connection hole to complete the installation of the valve cover 5.

[0079] Some terms such as "installation", "arrangement", "provided with", and "connection" in the present utility model should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral structure; it may be a mechanical connection; it may be directly connected, or indirectly connected through an intermediate medium, or there may be internal communication between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] The above schematically describes the present utility model and its embodiments, and this description is not restrictive. What is shown in the drawings is only one of the embodiments of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the creative purpose of the present utility model, they shall fall within the protection scope of the present utility model.

Claims

1. An eccentric semi-spherical valve, comprising: A valve body (1), within which a valve chamber (13) is provided, and a first opening (11), a second opening (12) and a maintenance port (14) which are all communicated with the valve chamber (13) are further formed on the valve body (1); A valve core (2), rotatably installed within the valve chamber (13), including a sealing disc (22) and a first main sealing ring (21) provided on the sealing disc (22), and the first main sealing ring (21) can rotate following the valve core (2) and switch positions among the first opening (11), the second opening (12) and the maintenance port (14); A telescopic valve seat (4), having an inner end and an outer end, and the inner end extends into the maintenance port (14) and is sealingly connected thereto; It is characterized in that: The outer end of the telescopic valve seat (4) is located outside the maintenance port (14) and is connected to the valve body (1) through a driving assembly (6), and the driving assembly (6) can drive the telescopic valve seat (4) to axially move along the maintenance port (14); A detachable valve cover (5) is sealingly connected to the outer end opening of the telescopic valve seat (4); During on-line maintenance, the driving assembly (6) drives the telescopic valve seat (4) to move into contact and seal with the sealing disc (22), and an isolation chamber is formed at the maintenance port (14) by the sealing disc (22), the telescopic valve seat (4) and the valve cover (5), and the first main sealing ring (21) is located within the isolation chamber, and the first main sealing ring (21) can be overhauled by disassembling the valve cover (5).

2. The eccentric semi-spherical valve according to claim 1, characterized in that: The outer end of the telescopic valve seat (4) has a first connection position which is arranged to avoid the driving assembly (6), and the valve cover (5) has a second connection position which is also arranged to avoid the driving assembly (6), and the positions of the first connection position and the second connection position correspond to each other and are connected by a fixing member.

3. The eccentric semi-spherical valve according to claim 2, characterized in that: The first connection position is a second fixing step (42) circumferentially arranged on the inner side of the outer end of the telescopic valve seat (4), and the second connection position is a third fixing step (54) circumferentially arranged on the side of the valve cover (5), and the third fixing step (54) overlaps on the second fixing step (42).

4. The eccentric semi-spherical valve according to claim 3, characterized in that: The fixing member includes a snap ring (51) and a fixing ring (52), the snap ring (51) is located outside the third fixing step (54) and is fitted on the telescopic valve seat (4); the snap ring (51) includes at least two split snap rings, and each split snap ring is fixedly connected to the fixing ring (52) together.

5. The eccentric semi-spherical valve according to claim 3, characterized in that: The fixing member is a bolt or a screw rod passing through the third fixing step (54) and the second fixing step (42).

6. The eccentric semi-spherical valve according to claim 2, wherein: The first connection position is a connection hole (44) formed on the outer end face of the telescopic valve seat (4), and the second connection position is a valve cover connection hole formed on the valve cover (5) and corresponding to the position of the connection hole (44); the fixing member is a bolt or a screw rod, and the fixing member passes through the connection hole (44) and the valve cover connection hole for fixed connection.

7. The eccentric semi-spherical valve according to any one of claims 1-6, characterized in that: A first fixing step (41) is circumferentially and prominently provided on the outer side of the outer end of the telescopic valve seat (4). The driving assembly (6) includes a connecting member (60) and a locking member threadedly connected to the connecting member (60). One end of the connecting member (60) passes through the first fixing step (41), and the other end is connected to the valve body (1); the locking member includes a first locking member (61) and a second locking member (62), and the first locking member (61) and the second locking member (62) are respectively located on both sides of the first fixing step (41).

8. The eccentric semi-spherical valve according to claim 7, characterized in that: The valve body (1) includes a fixed valve cover (3). The fixed valve cover (3) is located outside the maintenance port (14), and the fixed valve cover (3) has an opening corresponding to the telescopic valve seat (4).

9. The eccentric semi-spherical valve according to claim 7, wherein: A second main sealing ring (45) is circumferentially provided on the inner side of the inner end of the telescopic valve seat (4). The second main sealing ring (45) can contact the sealing disc (22) to form a seal; the telescopic valve seat (4) and the second main sealing ring (45) are integrally connected by vulcanization.

10. The eccentric semi-spherical valve according to claim 7, wherein: A pressure relief valve (53) is further connected to the valve cover (5).

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