An online maintainable eccentric half-ball valve

Abstract

This utility model discloses an eccentric hemispherical valve that can be maintained online. The valve body has an internal valve cavity with a maintenance port on its upper side. An inner chamber is located inside the maintenance port. The valve core includes a sealing disc and a main sealing ring mounted on the sealing disc. The valve seat includes a lower valve seat and an upper valve seat connected together. One end of the valve seat extends into the inner chamber and divides it into a first chamber and a second chamber, while the other end extends out of the inner chamber. One end of the piping assembly is connected to the valve cavity, and the other end is connected to the first and second chambers respectively. During online maintenance, the valve core rotates to the maintenance position at the maintenance port, and the valve seat moves downward, causing the lower valve seat to contact the sealing disc and form an isolation chamber. The main sealing ring is located within the isolation chamber. The main sealing ring can be maintained by opening the maintenance port. The valve has a simple structure, low cost, and is easy to maintain. Furthermore, the piping assembly does not require an external power source; instead, it cleverly utilizes the pressure of the medium within the pipeline to control the up-and-down movement of the valve seat.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and more specifically, to an eccentric hemispherical valve that can be maintained online. Background Technology

[0002] During use or after the eccentric ball valve has reached the end of its service life, the valve core sealing ring may wear or become damaged, leading to leakage. The damaged sealing ring needs to be replaced. Replacing the damaged sealing ring requires stopping the water supply and shutting off the valves before and after the valve. However, in some applications, the water supply cannot be stopped, preventing the replacement of the sealing ring while the eccentric ball valve is in operation. This results in the leakage problem caused by the damaged sealing ring not being addressed promptly.

[0003] To enable timely replacement of worn or damaged valve core seals without interrupting water flow when leakage occurs, existing technologies, such as the one disclosed in patent announcement number CN219866371U, provide an eccentric hemispherical valve. This valve has a liftable sealing seat inside. After the eccentric hemispherical valve is fully opened, the liftable sealing seat descends to its lower end, abutting against the outer surface of the hemispherical valve disc to create a sealed pressure chamber between the valve cover and the hemispherical valve disc.

[0004] Existing solutions enable online maintenance by controlling the up-and-down movement of the sealing valve seat or moving parts to establish a sealing contact with the valve core during valve operation. However, the driving components for controlling the up-and-down movement of the sealing valve seat or moving parts in existing solutions are bolts or screws. This requires manual tightening and loosening of multiple driving components each time, resulting in numerous parts, complex structure, and low maintenance efficiency. Summary of the Invention

[0005] This invention provides an eccentric hemispherical valve that can be maintained online, making the movement of the sealing seat more convenient and improving the efficiency of inspection or replacement of the sealing ring.

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

[0007] An eccentric hemispherical valve that can be maintained online includes,

[0008] The valve body has a valve cavity inside, and a maintenance port communicating with the valve cavity is opened on the upper side of the valve body. An inner cavity with an opening is provided inside the maintenance port.

[0009] The valve core, rotatably mounted in the valve cavity to open and close the eccentric hemispherical valve, includes a sealing disc and a main sealing ring disposed on the sealing disc;

[0010] A valve seat, wherein a portion of the valve seat extends into an inner cavity and divides it into a first cavity and a second cavity, and a further portion of the valve seat extends out of the inner cavity;

[0011] A piping assembly, one end of which is connected to the valve chamber, and the other end is provided with a first pipe communicating with the first chamber and a second pipe communicating with the second chamber;

[0012] During online maintenance, the pressure inside the valve cavity is used to fill the second chamber with fluid medium through the second pipeline. The valve seat moves downward to contact and seal with the sealing disc. The sealing disc and the valve seat form an isolation chamber at the maintenance port. The main sealing ring is located in the isolation chamber. The main sealing ring can be maintained by opening the maintenance port.

[0013] As a further improvement, a valve cover is installed at the maintenance port, with one end of the valve cover extending toward the inside of the maintenance port to form a valve cover sidewall;

[0014] The sidewalls of the valve body surrounding the maintenance port are called maintenance port sidewalls;

[0015] The inner chamber is formed by the valve cover, the valve cover sidewall, and the maintenance port sidewall.

[0016] As a further improvement, the valve seat includes a lower valve seat and an upper valve seat connected together, the upper valve seat being located in the inner cavity and dividing it into a first chamber and a second chamber, and one end of the lower valve seat extending out of the inner cavity.

[0017] As a further improvement, the first chamber is located between the lower valve seat and the service port sidewall, and the second chamber is located between the upper valve seat and the valve cover.

[0018] As a further improvement, a step is provided on the outer side of the valve cover sidewall and at the end closest to the valve cover.

[0019] The inner side of the maintenance port sidewall is provided with a first sidewall step and a second sidewall step from top to bottom.

[0020] As a further improvement, a valve seat sealing ring is provided at the end of the lower valve seat near the valve core.

[0021] As a further improvement, the valve seat is sealed to both the service port sidewall and the valve cover sidewall.

[0022] As a further improvement, the piping assembly also includes a water inlet pipe, one end of which passes through the side wall of the valve body and communicates with the valve cavity, and the other end is connected to the first pipe and the second pipe;

[0023] The first pipeline is also connected to a first water outlet pipe, and the second pipeline is also connected to a second water outlet pipe.

[0024] As a further improvement, a third valve is installed on the first water outlet pipe, and a fourth valve is installed on the second water outlet pipe;

[0025] A main valve is installed on the water inlet pipe;

[0026] A first valve is installed on the first pipeline, and the first valve is located between the main valve and the first outlet pipe;

[0027] A second valve is installed on the second pipeline, and the second valve is located between the main valve and the second outlet pipe.

[0028] As a further improvement, a third valve is installed on the first water outlet pipe, and a fourth valve is installed on the second water outlet pipe;

[0029] The end of the water inlet pipe furthest from the valve chamber is connected to an L-shaped three-way ball valve, which is also connected to the first pipe and the second pipe.

[0030] Compared with the prior art, the technical solution provided by this utility model has the following advantages: During normal operation, the eccentric hemispherical valve of this application controls the valve seat to move downward through the pipeline assembly, forming an isolation chamber at the maintenance port that is isolated from the valve cavity. Opening this isolation chamber allows for maintenance of the main sealing ring, achieving online maintenance of the eccentric hemispherical valve. After maintenance, the valve seat is then controlled to move upward through the pipeline assembly, allowing the valve core to rotate normally and control the opening and closing of the eccentric hemispherical valve. Main sealing ring maintenance can be achieved without disassembling the entire valve, and maintenance can be performed without closing the pipeline, greatly reducing maintenance time and cost. Moreover, the eccentric hemispherical valve of this application has a simple structure, low cost, and convenient maintenance. The pipeline assembly does not have an external power source; instead, it cleverly utilizes the medium pressure within the pipeline to control the up-and-down movement of the valve seat. Simultaneously, the first and second pipelines are used to control the up-and-down movement of the valve seat, improving controllability and enabling rapid valve seat response. Attached Figure Description

[0031] Figure 1 This is a cross-sectional structural diagram of an eccentric hemispherical valve.

[0032] Figure 2 for Figure 1 Enlarged structural diagram at point A in the middle;

[0033] Figure 3 This is a schematic diagram of the valve body structure;

[0034] Figure 4 This is a schematic diagram of the valve cover structure;

[0035] Figure 5 This is a schematic diagram of the valve seat structure;

[0036] Figure 6This is a schematic diagram of the valve seat structure from another angle;

[0037] Figure 7 This is a schematic diagram of the valve core structure.

[0038] Label Explanation:

[0039] 1. Valve body; 11. First opening; 12. Second opening; 13. Valve cavity; 14. Maintenance port sidewall; 141. First sidewall step; 142. Second sidewall step; 2. Valve core; 21. Main sealing ring; 22. Sealing disc; 221. Sealing groove; 23. Shaft hole; 24. Pressure plate;

[0040] 3. Valve cover; 31. Valve cover sidewall; 32. Valve cover sidewall step; 4. Sealing cover; 5. Lower valve seat; 51. Valve seat sealing ring; 6. Upper valve seat; 62. First chamber; 63. Second chamber; 621. First chamber opening; 631. Second chamber opening;

[0041] 7. Piping components; 71. Inlet pipe; 701. Main valve; 72. First pipe; 702. First valve; 73. Second pipe; 703. Second valve; 74. First outlet pipe; 704. Third valve; 75. Second outlet pipe; 705. Fourth valve. Detailed Implementation

[0042] To further understand the content of this utility model, a detailed description of this utility model will be provided in conjunction with the accompanying drawings and embodiments.

[0043] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate for the embodiments of this application described herein.

[0045] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to be constructed and operated in a specific orientation. Furthermore, some of the above terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application according to the specific circumstances.

[0046] Eccentric ball valves are mainly used in pipelines for conveying liquid media. They are used to cut off or connect pipelines in the pipeline system. The eccentric ball valve is equipped with a valve core. When the valve core rotates to different positions, it can close the ball valve to cut off the flow of media, or open the ball valve to allow the media to flow.

[0047] In eccentric ball valves, the main sealing ring on the valve core wears down over time due to repeated opening and closing of the valve, leading to seal failure and requiring timely maintenance. This application provides an eccentric ball valve that can be maintained online, allowing for maintenance of the main sealing ring while the valve is operating on the pipeline.

[0048] Specifically, this application provides an eccentric hemispherical valve that can be maintained online, including a valve body 1, a valve core 2, a valve seat, and a pipeline assembly. The valve body 1 has a valve cavity 13 inside, and a maintenance port communicating with the valve cavity 13 is opened on the upper side of the valve body 1. A sealing cover 4 is installed at the maintenance port, and an inner chamber with an opening is provided inside the maintenance port. The valve core 2 is rotatably mounted in the valve cavity 13 to open and close the eccentric hemispherical valve. The valve core 2 includes a sealing disc 22 and a main sealing ring 21 disposed on the sealing disc 22. A portion of the valve seat extends into the inner chamber and divides it into a first chamber 62 and a second chamber 63, while the other portion of the valve seat extends out of the inner chamber. Specifically, the valve seat includes a lower valve seat 5 and an upper valve seat 6 connected together. The upper valve seat 6 is located in the inner chamber and divides it into the first chamber 62 and the second chamber 63, while one end of the lower valve seat 5 extends out of the inner chamber. One end of the pipeline assembly is connected to the valve chamber 13, and the other end is provided with a first pipeline 72 connected to the first chamber 62 and a second pipeline 73 connected to the second chamber 63. Fluid medium is filled into the first chamber 62 or the second chamber 63 through the pipeline assembly to drive the valve seat to move up and down.

[0049] During online maintenance, the pressure inside valve chamber 13 is introduced into the second chamber 63 through the second pipeline 73, applying force to the upper valve seat 6. The valve seat moves downward, and simultaneously, the medium flows out of the first chamber 62. The lower valve seat 5 moves to contact and seal with the sealing disc 22. The sealing disc 22 and the lower valve seat 5 form an isolation chamber at the maintenance port, and the main sealing ring 21 is located inside the isolation chamber. The main sealing ring 21 can be maintained by opening the maintenance port. After maintenance is completed, the management component moves the valve seat upward again, allowing the valve core 2 to rotate and normally open and close the ball valve.

[0050] The eccentric hemispherical valve of this application enables online maintenance of the ball valve. During online maintenance, the valve core 2 is in the maintenance position at the maintenance port, and the valve seat moves down to contact and seal with the sealing disc 22. The sealing disc 22 and the lower valve seat 5 form an isolation chamber at the maintenance port, allowing maintenance of the main sealing ring 21 by opening the maintenance port. Furthermore, the pressure within the valve chamber 13 drives the valve seat up and down via the pipeline assembly, which is more convenient than existing methods that rely on manually tightening or loosening bolts or screws. Additionally, the pipeline assembly does not require an external power source to drive the valve seat up and down, making the eccentric hemispherical valve of this application more suitable for locations where external power is difficult to obtain, such as remote areas.

[0051] In addition, in this application, one end of the piping assembly is connected to the valve chamber 13, and the other end is provided with a first pipe 72 communicating with the first chamber 62 and a second pipe 73 communicating with the second chamber 63. The piping assembly delivers fluid from the valve chamber to the first chamber 62 through the first pipe 72 to drive the valve seat to move upward; the piping assembly delivers fluid from the valve chamber to the second chamber 63 through the second pipe 73 to drive the valve seat to move downward; the first pipe 72 and the second pipe 73 are used to control the up and down movement of the valve seat respectively, and the operation of the first pipe 72 and the second pipe 73 is independent of each other, which improves controllability and makes the valve seat respond quickly.

[0052] Specifically, in combination Figure 1 and Figure 3 The valve body 1 has a valve cavity 13 inside, and a maintenance port communicating with the valve cavity 13 is opened on the upper side of the valve body 1. More specifically, the valve body 1 also has a first opening 11 and a second opening 12, both communicating with the valve cavity 13. Figure 1 Taking the center view as an example, specifically, the first opening 11 and the second opening 12 are located on the front and rear sides of the valve body 1, respectively, and the first opening 11 and the second opening 12 are located on the same axis. The maintenance port is located on the upper side of the valve body 1.

[0053] After the eccentric ball valve is installed in the piping system, when liquid flows in the valve body 1, if the liquid flows from the first opening 11 to the second opening 12, then 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, then the second opening 12 is the inlet and the first opening 11 is the outlet. The specific inlet and outlet settings of the valve body depend on the installation of the ball valve in the piping system. For ease of explanation, in this embodiment, the first opening 11 is described as the inlet and the second opening 12 as the outlet. In addition, in this embodiment, an inner chamber with an opening is also provided inside the maintenance port.

[0054] Combination Figure 7 As shown, the valve core 2 rotates to open and close the eccentric hemispherical valve. Specifically, the valve core 2 is rotatably mounted in the valve cavity 13. The valve core 2 includes a sealing disc 22 and a main sealing ring 21 disposed on the sealing disc 22. The 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. When the main sealing ring 21 rotates to the first opening 11 or the second opening 12, the main sealing ring 21 is in the working position, which cuts off the flow passage in the valve body, and the ball valve is closed. When the main sealing ring 21 rotates to the maintenance port, the main sealing ring 21 is in the maintenance position, which opens the flow passage in the valve body, and the ball valve is opened.

[0055] Regarding the rotation of valve core 2, combined with Figure 1 and Figure 7 The valve core 2 has coaxial shaft holes 23 at both ends, and valve shafts are respectively installed in the shaft holes 23. The valve core 2 is connected to the valve body 1 through the valve shafts, and the valve shaft in one of the shaft holes passes through the valve body 1 to the outside of the valve body 1 and connects to the drive unit. The drive unit drives the valve core 2 to rotate. For example, the drive unit can be a servo motor, which drives the valve core 2 to rotate. A main sealing ring 21 is provided on the sealing disc 22. The main sealing ring 21 is used to seal when the eccentric hemispherical valve is closed.

[0056] The valve core 2 also includes a pressure plate 24, which is detachably fixed to the sealing plate 22. One side of the pressure plate 24 abuts against and presses against one side of the main sealing ring 21, thus fixing the main sealing ring 21. When the main sealing ring 21 needs to be replaced, the pressure plate 24 is removed, thereby removing the main sealing ring 21. In this embodiment, the pressure plate 24 is fixed to the sealing plate 22 by bolts. Of course, in other embodiments, the pressure plate 24 can be fixed to the sealing plate 22 by other means. In addition, a sealing groove 221 is provided on the outer side of the sealing plate 22 and located on the main sealing ring 21.

[0057] Combination Figure 2As shown, the valve seat includes a lower valve seat 5 and an upper valve seat 6 connected together. The end of the valve seat near the upper valve seat 6 extends into the inner cavity and divides it into a first chamber 62 and a second chamber 63. The end of the valve seat near the lower valve seat 5 extends out of the inner cavity through the opening of the inner cavity.

[0058] In this embodiment, the end of the pipeline assembly 7 near the inner chamber is provided with a first pipeline 72 communicating with the first chamber 62 and a second pipeline 73 communicating with the second chamber 63; during online maintenance, the pressure in the valve chamber 13 causes the second pipeline 73 to fill the second chamber 63 with medium, driving the valve seat to move downward.

[0059] Specifically, during online maintenance, the medium in valve chamber 13, under the pressure within the chamber, is introduced into the second chamber 63 through the second pipeline 73. Simultaneously, the medium flows out of the first chamber 62, driving the valve seat to move downwards. This causes the lower end of the lower valve seat 5 to move into contact with the sealing disc 22, forming an isolation chamber. The main sealing ring 21 is located within the isolation chamber, and maintenance of the main sealing ring 21 can be performed by opening the maintenance port. Maintenance of the main sealing ring 21 can include inspection, replacement, or servicing.

[0060] Normally, the maintenance port is sealed by the sealing cap 4. In this embodiment, when the eccentric hemispherical valve is operating normally online, the main sealing ring 21 is maintained online. Specifically, when the eccentric hemispherical valve needs online maintenance, the valve core 2 rotates to the maintenance port, so that the axis of the sealing disc 22 coincides with the axis of the maintenance port. Under the action of the pressure inside the valve cavity 13, the medium is filled into the second chamber 63 through the second pipeline 73, which applies a downward force to the upper side of the upper valve seat 6. At the same time, the medium in the first chamber 62 flows out, thereby driving the valve seat to move downward, so that the lower end of the lower valve seat 5 moves to contact and seal with the sealing disc 22 to form an isolation chamber. The main sealing ring 21 is located in the isolation chamber. The main sealing ring 21 can be maintained by opening the maintenance port by removing the sealing cap 4. After maintenance, the medium in the valve chamber 13 is filled into the first chamber 62 through the first pipeline 72 under the action of the internal pressure, which applies an upward force to the lower side of the upper valve seat 6. At the same time, the medium in the second chamber 63 flows out, causing the valve seat to move upward.

[0061] As a preferred implementation method, combined with Figure 1 , Figure 3 and Figure 4 As shown, a valve cover 3 is also installed at the maintenance port, with one end of the valve cover 3 extending into the maintenance port to form a valve cover sidewall 31. The sidewalls of the valve body 1 around the maintenance port are called maintenance port sidewalls 14. The inner chamber is formed by the valve cover 3, the valve cover sidewall 31, and the maintenance port sidewall 14.

[0062] In addition, the sealing cover 4 is sealed and installed on the valve cover 3. The sealing cover 4, together with the valve cover 3, the valve cover side wall 31, the valve seat, and the sealing disc 22, forms a closed isolation cavity. Therefore, the main sealing ring 21 can be maintained by removing the sealing cover 4.

[0063] Combination Figure 2 , Figure 5 and Figure 6 As shown, the lower valve seat 5 and the upper valve seat 6 are connected together to form an L-shaped valve seat. The valve seat divides the inner cavity into a first chamber 62 and a second chamber 63, with one end of the lower valve seat 5 extending out of the inner cavity. Specifically, the first chamber 62 is located between the lower valve seat 5 and the service port sidewall 14, and the second chamber 63 is located between the upper valve seat 6 and the valve cover 3.

[0064] Combination Figure 2 , Figure 3 and Figure 4 As shown, a valve cover sidewall step 32 protrudes from the outer side of the valve cover sidewall 31, near the valve cover 3. A first sidewall step 141 and a second sidewall step 142 are sequentially arranged from top to bottom on the inner side of the maintenance port sidewall 14. The second sidewall step 142 forms the first chamber 62. The first sidewall step 141 limits the downward movement of the valve seat when the upper valve seat 6 moves to the first sidewall step 141, ensuring the lower valve seat 5 contacts and seals the sealing disc 22. The valve cover sidewall step 32 limits the upward movement of the valve seat when the upper valve seat 6 moves to the valve cover sidewall step 32, ensuring the valve seat moves to a suitable position so the valve core can rotate normally without interfering with the valve seat.

[0065] To improve the sealing performance of the isolation chamber, a valve seat sealing ring 51 is provided at the end of the lower valve seat 5 away from the upper valve seat 6 (the lower end of the lower valve seat 5). When the lower valve seat 5 moves to contact and seal with the sealing disc 22, the valve seat sealing ring 51 on the lower valve seat 5 abuts against the sealing groove 221 on the outer side of the sealing disc 22.

[0066] Similarly, to improve the sealing performance of the first chamber 62 and the second chamber 63, and to ensure good pressure retention during maintenance, the valve seat is sealed to both the service port sidewall 14 and the valve cover sidewall 31. Specifically, see... Figure 2 In the middle, a sealing ring is installed on the side of the valve seat that contacts the service port side wall 14, and a sealing ring is installed on the side of the valve cover side wall 31 that contacts the valve seat.

[0067] It should be noted that when the valve cover side wall 31 extends toward the maintenance port, its length needs to meet the requirements of online maintenance. When the lower valve seat 5 moves so that the valve seat sealing ring 51 abuts against the sealing groove 221 on the outside of the sealing disc 22, the valve seat also forms a sealing connection with the valve cover side wall 31, so that the second chamber 63 remains sealed.

[0068] See Figure 1 and Figure 2In a preferred embodiment, the piping assembly 7 further includes a water inlet pipe 71, one end of which passes through the side wall of the valve body 1 and communicates with the valve cavity 13, and the other end is connected to the first pipe 72 and the second pipe 73. In addition, the first pipe 72 is also connected to a first water outlet pipe 74, and the second pipe 73 is also connected to a second water outlet pipe 75.

[0069] To facilitate control of the flow of each pipe, a third valve 704 is installed on the first outlet pipe 74, and a fourth valve 705 is installed on the second outlet pipe 75. Furthermore, a main valve 701 is installed on the inlet pipe 71; a first valve 702 is installed on the first pipe 72, located between the main valve 701 and the first outlet pipe 74. A second valve 703 is installed on the second pipe 73, located between the main valve 701 and the second outlet pipe 75.

[0070] See Figure 2 and Figure 3 A through hole is formed on the valve body 1 corresponding to the first chamber 62, serving as the opening 621 of the first chamber. The first pipeline 72 communicates with the first chamber 62 through the opening 621. A through hole is formed on the valve body 1 corresponding to the second chamber 63, serving as the opening 631 of the second chamber. The second pipeline 73 communicates with the second chamber 63 through the opening 631. One end of the first pipeline 72 is connected to the opening 621 of the first chamber, and the other end is connected to the inlet pipeline 71. One end of the second pipeline 73 is connected to the opening 631 of the second chamber, and the other end is connected to the inlet pipeline 71.

[0071] In this embodiment, during normal operation of the eccentric hemispherical valve, the valve core 2 rotates at the maintenance port, connecting the first opening 11 and the second opening 12. In this state, the main valve 701, the third valve 704, and the fourth valve 705 are in the closed state, or the main valve 701, the first valve 702, the second valve 703, the third valve 704, and the fourth valve 705 are all in the closed state.

[0072] When online maintenance is required, the following example is given, where the medium in valve chamber 1 is liquid water:

[0073] First, open the main valve 701, the second valve 703 and the third valve 704, while keeping the first valve 702 and the fourth valve 705 closed.

[0074] Second, the medium in the valve chamber 13 enters the second chamber 63 through the inlet pipe 71 and the second pipe 73 under the pressure inside the chamber. Under the action of water pressure, a force is applied to the upper side of the upper valve seat 6. At the same time, the medium in the first chamber 62 flows out through the first pipe 72 and the first outlet pipe 74, causing the valve seat to move downward. The valve seat sealing ring 51 on the lower valve seat 5 abuts against the sealing groove 221 on the outside of the sealing disc 22 to form an isolation chamber.

[0075] Third, open the sealing cover 4 to maintain the main sealing ring 21;

[0076] Fourth, after maintenance is completed, open the main valve 701, the first valve 702 and the fourth valve 705, while keeping the second valve 703 and the third valve 704 closed.

[0077] Fifth, under the action of the pressure inside the valve chamber 13, the medium enters the first chamber 62 through the inlet pipe 71 and the first pipe 72. Under the action of water pressure, a force is applied to the lower side of the upper valve seat 6. At the same time, the medium in the second chamber 63 flows out through the second pipe 73 and the second outlet pipe 75, causing the valve seat to move upward.

[0078] Sixth, once the valve seat rises to the designated position, the maintenance of the main sealing ring 21 is completed. After installing the sealing cover 4, the valve core 2 can rotate normally to control the opening and closing of the eccentric hemispherical valve.

[0079] During normal operation, the eccentric hemispherical valve of this application controls the valve seat to move downwards via the piping assembly, forming an isolation chamber at the maintenance port that is separate from the valve chamber 13. Opening this isolation chamber allows for maintenance of the main sealing ring 21. After maintenance, the valve seat is then controlled to move upwards via the piping assembly, allowing the valve core 2 to rotate normally and control the opening and closing of the eccentric hemispherical valve. This allows for maintenance of the main sealing ring without disassembling the entire valve and for repairs without shutting down the pipeline, significantly reducing maintenance time and costs.

[0080] Furthermore, the eccentric hemispherical valve of this application has a simple structure, low cost, and convenient maintenance. The piping assembly does not have any external power source; instead, it cleverly uses the fluid within the pipe as the medium and the fluid pressure as the power source, along with the various valves on the piping assembly 7 controlling the up-and-down movement of the valve seats. On one hand, the valves on the piping assembly 7 ensure both normal operation of the valve seats and rapid replacement in case of failure. For example, if the main valve 701 is damaged, the first valve 702 and the second valve 703 can be closed simultaneously, putting the piping assembly 7 in an open-circuit state, thereby allowing the main valve 701 to be replaced. It should be noted that after disassembling the main valve 701, a plug needs to be installed in the end of the inlet pipe 71 near the main valve 701 to prevent water from spraying out of the valve chamber, facilitating the replacement of the main valve 701. If the first valve 702, the second valve 703, the third valve 704, or the fourth valve 705 is damaged, the main valve 701 can be closed, putting the piping assembly 7 in an open-circuit state, thereby allowing the damaged small valves to be replaced.

[0081] In one specific implementation, the upper side of the upper valve seat 6 is the upper surface 601, the lower side is the lower surface 602, and the lower end face is the bottom surface 501 (including the lower surface of the valve seat sealing ring 51). The area of ​​the lower surface 602 is larger than the area of ​​the bottom surface 501. During normal operation, the pressure inside the valve chamber 13 is 1 MPa or 1.6 MPa. The description assumes a pressure of 1 MPa inside the valve chamber 13. Details are as follows:

[0082] The upper surface of the valve seat, 601, has a surface area of ​​1315 mm². 2 ;

[0083] The bottom surface area of ​​valve seat 501 is 580mm². 2 ;

[0084] The lower surface of the valve seat, 602, has a surface area of ​​736 mm². 2 ;

[0085] The valve seat weight is 400N;

[0086] The frictional force experienced by the valve seat during movement is 100N;

[0087] When the valve seat moves downward, the pressure applied to the upper surface 601 of the valve seat in the second chamber 63 is 1315N, and the force acting on the bottom surface 501 of the valve seat in the valve cavity 13 is 580N. Since 1315 + 400 - 580 - 100 > 0, the downward movement of the valve seat is achieved. When the valve seat moves upward, the pressure applied to the lower surface 602 of the valve seat in the first chamber 62 is 736N, and the force acting on the bottom surface 501 of the valve seat in the valve cavity 13 is 580N. Since 736 + 580 - 400 - 100 > 0, the upward movement of the valve seat is achieved. Therefore, without external power, the pressure in the valve cavity 13 is sufficient to move the valve seat up and down through the piping assembly, thereby enabling online maintenance of the main sealing ring 21.

[0088] In another embodiment, the main valve 701, the first valve 702, and the second valve 703 are not provided. Instead, an L-shaped three-way ball valve is connected to the end of the inlet pipe 71 away from the valve chamber 13. The L-shaped three-way ball valve is also connected to the first pipe 72 and the second pipe 73. Specifically, the L-shaped three-way ball valve has an inlet one, an outlet two, and an outlet three. Inlet one is connected to the inlet pipe 71, outlet two is connected to the first pipe 72, and outlet three is connected to the second pipe 73. The L-shaped three-way ball valve has two flow directions. Opening the flow passage between the inlet pipe 71 and the second pipe 73, closing the fourth valve 705, and opening the third valve 704 controls the valve seat to move downward. Opening the flow passage between the inlet pipe 71 and the first pipe 72, closing the third valve 704, and opening the fourth valve 705 controls the valve seat to move upward.

[0089] The terms “installation,” “setup,” “equipped with,” and “connection” used herein should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0090] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. An eccentric hemispherical valve that can be maintained online, characterized in that: include, The valve body (1) has a valve cavity (13) inside. A maintenance port communicating with the valve cavity (13) is opened on the upper side of the valve body (1), and an inner cavity with an opening is provided inside the maintenance port. The valve core (2) is rotatably mounted in the valve cavity (13) to open and close the eccentric hemispherical valve, including a sealing disc (22) and a main sealing ring (21) disposed on the sealing disc (22); A valve seat, wherein a portion of the valve seat extends into the inner cavity and divides it into a first chamber (62) and a second chamber (63), and another portion of the valve seat extends out of the inner cavity; The pipeline assembly (7) has one end connected to the valve chamber (13), and the other end is provided with a first pipeline (72) connected to the first chamber (62) and a second pipeline (73) connected to the second chamber (63); During online maintenance, the pressure inside the valve chamber (13) is used to fill the second chamber (63) with fluid medium through the second pipeline (73). The valve seat moves downward to contact and seal with the sealing disc (22). The sealing disc (22) and the valve seat form an isolation chamber at the maintenance port. The main sealing ring (21) is located in the isolation chamber. The main sealing ring (21) can be maintained by opening the maintenance port.

2. The online maintainable eccentric hemispherical valve according to claim 1, characterized in that: A valve cover (3) is installed at the maintenance port, and one end of the valve cover (3) extends toward the inside of the maintenance port to form a valve cover sidewall (31); The valve body (1) has a side wall around the maintenance port that is called the maintenance port side wall (14). The inner chamber is formed by the valve cover (3), the valve cover side wall (31), and the maintenance port side wall (14).

3. The online maintainable eccentric hemispherical valve according to claim 2, characterized in that: The valve seat includes a lower valve seat (5) and an upper valve seat (6) connected together. The upper valve seat (6) is located in the inner cavity and divides it into a first cavity (62) and a second cavity (63). One end of the lower valve seat (5) extends out of the inner cavity.

4. The online maintainable eccentric hemispherical valve according to claim 3, characterized in that: The first chamber (62) is located between the lower valve seat (5) and the maintenance port sidewall (14), and the second chamber (63) is located between the upper valve seat (6) and the valve cover (3).

5. The online maintainable eccentric hemispherical valve according to claim 2, characterized in that: A valve cover sidewall step (32) is provided on the outer side of the valve cover sidewall (31) and at the end near the valve cover (3); The inner side of the maintenance port sidewall (14) is provided with a first sidewall step (141) and a second sidewall step (142) from top to bottom.

6. The online maintainable eccentric hemispherical valve according to claim 3, characterized in that: A valve seat sealing ring (51) is provided at one end of the lower valve seat (5) near the valve core (2).

7. The online maintainable eccentric hemispherical valve according to claim 2, characterized in that: The valve seat is sealed to the service port sidewall (14) and to the valve cover sidewall (31).

8. The online maintainable eccentric hemispherical valve according to any one of claims 1-7, characterized in that: The pipeline assembly (7) also includes a water inlet pipeline (71), one end of which passes through the side wall of the valve body (1) and communicates with the valve cavity (13), and the other end is connected to the first pipeline (72) and the second pipeline (73); The first pipe (72) is also connected to the first outlet pipe (74), and the second pipe (73) is also connected to the second outlet pipe (75).

9. The online maintainable eccentric hemispherical valve according to claim 8, characterized in that: A third valve (704) is installed on the first water outlet pipe (74), and a fourth valve (705) is installed on the second water outlet pipe (75); A main valve (701) is installed on the water inlet pipe (71); A first valve (702) is provided on the first pipeline (72), and the first valve (702) is located between the main valve (701) and the first outlet pipe (74); A second valve (703) is installed on the second pipeline (73), and the second valve (703) is located between the main valve (701) and the second outlet pipe (75).

10. The online maintainable eccentric hemispherical valve according to claim 8, characterized in that: A third valve (704) is installed on the first water outlet pipe (74), and a fourth valve (705) is installed on the second water outlet pipe (75); The end of the water inlet pipe (71) away from the valve chamber (13) is connected to an L-shaped three-way ball valve, which is also connected to the first pipe (72) and the second pipe (73).

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