Eccentric semi-ball valve capable of being overhauled under pressure

Abstract

The utility model discloses an eccentric semi-ball valve capable of being overhauled under pressure, and belongs to the technical field of valves. The ball valve comprises a valve body, a valve cover is arranged on the valve body, a valve cavity is formed in the valve body, a valve clack assembly is arranged in the valve cavity, and the valve clack assembly comprises a hemispheroid and a valve shaft used for driving the hemispheroid to rotate. A maintenance space is arranged on the side, close to the valve deck, of the valve body, and a movable maintenance valve seat is arranged at the junction of the maintenance space and the valve cavity. The maintenance valve seat comprises a connecting end and a movable end, and when the hemisphere rotates to the position of the maintenance valve seat, the connecting end of the maintenance valve seat is in contact with the hemisphere; an adjusting mechanism is arranged at the movable end of the maintenance valve seat and used for pushing the maintenance valve seat to move. The sealing element on the hemisphere can be conveniently and quickly overhauled or replaced, the structure is simple, and the operation is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an eccentric hemispherical valve for under-pressure maintenance. Background Art

[0002] When replacing a damaged sealing ring of an existing eccentric hemispheric valve, it is necessary to stop the water supply and close the valves before and after the pipeline. However, in some application scenarios, the pipeline is not allowed to stop the water supply, so the sealing ring cannot be replaced in the working state, resulting in the leakage problem caused by the damaged sealing ring cannot be solved in time.

[0003] For example, Chinese patent document CN220354526U discloses an eccentric hemispherical valve for online, under-pressure maintenance, comprising a valve body, a hemispherical body, a bonnet, a service valve seat, a locating ring, and adjusting studs. The bonnet is bolted to the top of the valve body, the hemispherical body is located within a cavity, and is connected to the valve body via a valve stem. A maintenance port is formed on the side of the valve body near the bonnet. The service port is provided with a locating ring, the bonnet is located above the locating ring, and the service valve seat is located below the locating ring. Adjusting bolts pass through the bonnet, the locating ring, and are connected to the service valve seat in sequence. All adjusting studs and the bonnet are evenly distributed with sealing rings. There are two sets of adjusting studs: one set of descending studs is threadedly connected to the locating ring, and the other set of ascending studs is threadedly connected to the service valve seat. These studs are adjusted with a positive nut to raise and lower the service valve seat. Both the service valve seat and the hemispherical body are provided with sealing rings, and the lifting and lowering of the service valve seat ensures a sealed opening and closing relationship with the hemispherical body. However, this application has a complex structure and is overly cumbersome to operate, making it prone to problems during under-pressure maintenance. Utility Model Content

[0004] 1. Technical problems to be solved by the utility model

[0005] In response to the problems raised in the background technology, the utility model provides an eccentric semi-ball valve for pressure maintenance to solve the above problems.

[0006] 2. Technical solution

[0007] In order to achieve the above-mentioned purpose, the technical solution provided by the present utility model is:

[0008] The utility model is an eccentric hemispherical valve for pressure maintenance, comprising a valve body, a valve cover being arranged on the valve body, a valve cavity being formed in the valve body, a valve flap assembly being arranged in the valve cavity, the valve flap assembly comprising a hemispherical body and a valve shaft for driving the hemispherical body to rotate; an inspection space is arranged on the valve body near the valve cover side, and a movable inspection valve seat is arranged at the junction of the inspection space and the valve cavity; the inspection valve seat comprises a connecting end and a movable end, the inspection valve seat is mounted on the valve body through the connecting end, and an adjusting mechanism is arranged on the movable end, when the hemispherical body rotates to the position where the eccentric hemispherical valve is fully opened, the adjusting mechanism drives the inspection valve seat to close, and the inspection valve seat forms a seal with the valve body and the hemispherical body respectively, separating the inspection space from the valve cavity.

[0009] As a further improvement of the present invention, the inspection valve seat includes a seat body, and the seat body is a circular ring structure; one end of the seat body is a connecting end, which is hinged to the valve body.

[0010] As a further improvement of the present invention, the end of the seat body away from the connecting end is a movable end, which is connected to the adjusting mechanism; the adjusting mechanism includes an adjusting rod and a mounting block, the adjusting rod is connected to the seat body, the mounting block is connected to the valve body, and the adjusting rod is threadedly connected to the mounting block.

[0011] As a further improvement of the present invention, the regulating rod is arranged in the maintenance space, and the end of the regulating rod extends from the maintenance space through the valve cover to the outside.

[0012] As a further improvement of the present invention, a second sealing member is provided on the inner periphery of the seat body, and the second sealing member is used for sealing between the seat body and the hemisphere.

[0013] As a further improvement of the present invention, a third sealing member is provided on the outer periphery of the seat body, and the third sealing member is used for sealing between the seat body and the valve body.

[0014] As a further improvement of the present invention, a connecting piece is provided at the movable end of the seat body, and the adjusting rod is installed on the connecting piece.

[0015] As a further improvement of the present invention, the connecting member includes a base body, a card slot and a slide slot are provided on the base body, the adjusting rod is installed in the card slot, and the connecting member is movably installed on the base body through the slide slot.

[0016] As a further improvement of the present invention, the hemisphere includes a spherical cap, and when maintenance is performed, the spherical cap is in squeeze contact with the second sealing member.

[0017] As a further improvement of the present invention, a first port and a second port connected to the valve cavity are respectively provided on both sides of the valve body, the connection end of the inspection valve seat is provided on the side close to the first port, and the hemisphere rotates back and forth between the inspection space and the second port.

[0018] 3. Beneficial effects

[0019] Compared with the existing known technologies, the technical solution provided by this utility model has the following significant effects:

[0020] (1) The utility model provides a pressure-maintenance eccentric hemispherical valve. To address the problem of inconvenience in online maintenance of existing hemispherical valves, a maintenance valve seat is provided. One end of the maintenance valve seat is connected to the valve body, and the other end is movable. The position of the maintenance valve seat is between the maintenance space and the valve cavity. When maintenance is required, the hemispherical body is rotated to the maintenance valve seat position. Since one end of the maintenance valve seat is connected to the valve body, it is only necessary to adjust the movable end to make it in sealing contact with the hemispherical body. The connection end moves slightly when the movable end moves, and the sealing contact between the maintenance valve seat and the hemispherical body can be achieved. At this time, the maintenance space and the valve cavity are separated by the cooperation of the maintenance valve seat and the hemispherical body, and the sealing part on the hemispherical body can be repaired or replaced. The hemispherical valve of the utility model only needs to press one end of the maintenance valve seat to achieve the sealing between the maintenance valve seat and the hemispherical body. Its maintenance structure is simple, which reduces the production difficulty of the product and is convenient to operate.

[0021] (2) The utility model provides an eccentric hemispherical valve for pressure maintenance, in which the connecting end of the maintenance valve seat is hinged to the valve body, and the movable end is threadedly connected to the mounting block on the valve body through an adjusting rod. The adjusting rod can be moved up and down by simply rotating the adjusting rod, thereby pushing the movable end of the maintenance valve seat to move, which is practical and convenient.

[0022] (3) The utility model provides an eccentric hemispherical valve for pressure maintenance. Seals are provided on both the inner and outer peripheries of the maintenance valve seat. The inner seal is in pressurized contact with the hemispherical body to ensure a seal between the maintenance valve seat and the hemispherical body. The outer seal is in pressurized contact with the valve body to ensure a seal between the maintenance valve seat and the valve body. This double seal ensures that liquid in the valve cavity will not leak out during maintenance.

[0023] (4) The utility model provides an eccentric hemispherical valve for pressure maintenance, which rotates back and forth between the maintenance space and the second port. Since the hemispherical valve of the utility model is an eccentric hemispherical valve, the center vertical line of the hemispherical body and the vertical line of the valve shaft are not on the same straight line, resulting in a large rotation radius on one side of the hemispherical body. The utility model sets the maintenance valve seat according to the rotation direction of the hemispherical body, so that the connection end of the maintenance valve seat will not affect the rotation of the hemispherical body. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of the semi-ball valve of the utility model;

[0025] Figure 2 This is a front view of the hemispherical valve of the utility model;

[0026] Figure 3 This is a side view of the hemispherical valve of the utility model;

[0027] Figure 4 for Figure 3 Sectional view of the AA plane;

[0028] Figure 5 This is a schematic diagram of the structure of the cooperation between the hemispherical body and the inspection valve seat in the hemispherical valve of the utility model;

[0029] Figure 6 This is a side view of the cooperation between the hemispherical body and the inspection valve seat in the hemispherical valve of the utility model;

[0030] Figure 7 for Figure 6 Cross-sectional view of the middle BB surface;

[0031] Figure 8 This is a structural diagram of the inspection valve seat in the utility model;

[0032] Figure 9 This is a structural diagram of the inspection valve seat in the utility model from another perspective;

[0033] Figure 10 for Figure 9 A magnified view of the structure at point C in the middle;

[0034] Figure 11 This is a top view of the hemispherical valve of the utility model;

[0035] Figure 12 for Figure 11 Cross-sectional view of the middle DD plane.

[0036] Description of the numbers in the schematic diagram:

[0037] 1. Valve body; 11. First port; 12. Second port; 13. Mounting block; 2. Valve disc assembly; 21. Valve shaft; 22. Hemisphere; 221. Ball crown; 222. Fixing piece; 223. First seal; 3. Inspection space; 4. Valve cover; 5. Valve cavity; 6. Inspection valve seat; 61. Seat body; 62. Pin shaft; 63. Adjusting rod; 64. Connecting piece; 641. Base; 642. Slot; 643. Slide; 65. Second seal; 66. Third seal; C. Hemisphere axis; D. Vertical line of valve shaft. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the utility model more clearly understood, the specific embodiments of the utility model are described in detail below with reference to the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited to the specific embodiments disclosed below.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation to the present invention.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0041] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0042] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0044] Example

[0045] Combine Figure 1-Figure 3 The present embodiment discloses an eccentric hemispherical valve for pressure maintenance, comprising a valve body 1. The valve body 1 of the present embodiment has a first port 11 and a second port 12 on either side thereof, serving as a water inlet and a water outlet, respectively. The valve body 1 also has an opening at the top, and a valve cover 4 is provided over the upper opening. In the present embodiment, the valve cover 4 is detachably connected to the valve body 1, and the connection between the two can be a snap connection, a threaded connection, a bolt connection, or the like. In the present embodiment, the valve cover 4 is connected to the valve body 1 using bolts, and a plurality of bolts are provided at circumferential intervals around the valve cover 4 to connect the valve cover 4 to the valve body 1, thereby ensuring that the valve cover 4 will not be dislodged by the liquid pressure of the valve body 1 when the hemispherical valve is in use.

[0046] Combine Figure 4 In this embodiment, two spaces are formed inside the valve body 1, namely the valve cavity 5 and the maintenance space 3. Under normal circumstances, the two spaces are connected to each other. The valve cavity 5 is a cavity through which liquid passes, and the maintenance space 3 is arranged between the valve cavity 5 and the valve cover 4. From the appearance, the maintenance space 3 is a part extending upward from the valve body 1, and the valve cover 4 is covered on the maintenance space 3 to seal the opening on the maintenance space 3.

[0047] In this embodiment, a valve flap assembly 2 is provided in the valve cavity 5, and the valve flap assembly 2 includes a hemisphere 22 and a valve shaft 21 for driving the hemisphere 22 to rotate. In this embodiment, a sealing valve seat is provided at a position of the valve cavity 5 close to the second port 12, and the hemisphere 22 serves as the valve flap of the hemisphere valve. When closing the valve, the hemisphere 22 rotates from the position of the maintenance space 3 to the sealing valve seat, and the hemisphere 22 contacts the sealing valve seat, thereby preventing the flow of liquid and achieving sealed valve closure. When opening the valve, the hemisphere 22 rotates from the sealing valve seat to the maintenance space 3, the hemisphere 22 leaves the sealing valve seat, and the liquid begins to circulate, achieving valve opening. When the hemisphere 22 is located at the position of the maintenance space 3 (that is, the hemisphere 22 rotates to the position as shown in FIG. Figure 4 The eccentric hemispherical valve is fully open (see the position shown). The hemispherical body 22 of this embodiment includes a spherical cap 221, on which a first sealing member 223 is disposed. The first sealing member 223 is removably mounted to the spherical cap 221 via a fixing member 222. The hemispherical body 22 of this embodiment is mounted on the valve body 1 via a valve shaft 21. Driven by a driving device, the valve shaft 21 drives the hemispherical body 22 to rotate.

[0048] Combine Figure 5-Figure 7 In this embodiment, a movable service valve seat 6 is provided at the junction of the service space 3 and the valve cavity 5. The service valve seat 6 includes a connecting end and a movable end. Specifically, the connecting end of the service valve seat 6 is hingedly connected to the valve body 1, and the end of the service valve seat 6 away from the connecting end is the movable end. Driven by the adjustment mechanism, the movable end can move, allowing the service valve seat 6 to move within the service space 3. In this embodiment, the connecting end is arranged at the junction of the maintenance space 3 and the valve cavity 5 and does not move. When the hemisphere 22 rotates to the position of the maintenance valve seat 6, the connecting end of the maintenance valve seat 6 contacts the hemisphere 22. When in the non-maintenance state, the movable end of the maintenance valve seat 6 does not contact the hemisphere 22. When maintenance is required, the movable end of the maintenance valve seat 6 descends and contacts the hemisphere 22 in a sealing manner, so that the maintenance valve seat 6 and the hemisphere 22 jointly separate the maintenance space 3 from the valve cavity 5. At this time, the valve cover 4 is removed, and the maintenance of the hemisphere 22 and the replacement of the sealing parts thereon can be completed in the maintenance space 3. This embodiment is provided with an inspection valve seat 6, one end of which is connected to the valve body 1 and the other end is movable. The inspection valve seat 6 is located between the inspection space 3 and the valve cavity 5. When inspection is required, the hemispherical body 22 is rotated to the position of the inspection valve seat 6. Since one end of the inspection valve seat 6 is connected to the valve body, the connection end does not need to be moved. It is only necessary to adjust the movable end so that it is in sealing contact with the hemispherical body 22. The inspection space 3 and the valve cavity 5 can be separated by the cooperation between the inspection valve seat 6 and the hemispherical body 22. At this time, the sealing member on the hemispherical body 22 can be inspected or replaced. The hemispherical valve of the utility model only needs to press one end of the inspection valve seat 6 to achieve the sealing between the inspection valve seat 6 and the hemispherical body 22. Its inspection structure is simple, which reduces the production difficulty of the product and is convenient to operate.

[0049] Combine Figure 8The inspection valve seat 6 of this embodiment includes a seat body 61. Since the sealing surface of the hemisphere 22 is circular, in order to cooperate with the hemisphere 22 to achieve sealing, the seat body 61 is a circular ring structure. When inspection is required, the entire seat body 61 is engaged with the outer periphery of the sealing surface of the hemisphere 22 to achieve sealing. One end of the seat body 61 is a connecting end, which is hinged to the valve body 1 through a pin 62. The end of the seat body 61 away from the connecting end is a movable end, which is connected to the adjustment mechanism. In this embodiment, the adjustment mechanism includes an adjusting rod 63 and a mounting block 13. The adjusting rod 63 is connected to the seat body 61, and the mounting block 13 is connected to the valve body 1. The adjusting rod 63 is threadedly connected to the mounting block 13. In this embodiment, the adjusting rod 63 is arranged in the inspection space 3, and the end of the adjusting rod 63 passes through the valve cover 4 and extends to the outside. When inspection is required, the staff rotates the adjusting rod 63 from the outside, thereby pushing the inspection valve seat 6 to move downward and make sealing contact with the hemisphere 22. At this time, the staff removes the valve cover 4 and inspects the hemispherical body 22.

[0050] In this embodiment, a connector 64 is provided at the movable end of the seat body 61, and an adjustment rod 63 is mounted on the connector 64 and can rotate on the connector 64. The adjustment rod 63 and connector 64 are connected in a detachable manner, allowing for easy removal and replacement of the adjustment rod 63 if damaged. In this embodiment, the service valve seat 6 is hingedly connected at its connection end to the valve body 1, and its movable end is threadedly connected to the mounting block 13 on the valve body 1 via the adjustment rod 63. Simply rotating the adjustment rod 63 allows for the adjustment rod 63 to move up and down, thereby moving the movable end of the service valve seat 6, resulting in practical and convenient operation.

[0051] Combine Figure 9 and Figure 10 In this embodiment, the connecting member 64 includes a base 641, a slot 642 and a slide 643 are provided on the base 641, wherein the adjusting rod 63 is arranged in the slot 642 and can rotate in the slot 642. The base 641 is arranged on the base 61 through the slide 643 and can move on the base 61. Figure 11 and Figure 12 The connecting member 64 rotates on the seat body 61 with the seat body 61 as the axis, so that the adjusting rod 63 always remains perpendicular to the valve cover 4 when moving at the movable end of the seat body 61. Figure 12 The diagram shows the state of the inspection valve seat 6 when the inspection valve seat 6 is not in sealing contact with the hemispherical body 22 . As can be seen from the diagram, the adjustment rod 63 always remains perpendicular to the valve cover 4 .

[0052] In this embodiment, a second sealing member 65 is provided on the inner periphery of the seat body 61, and the second sealing member 65 is used for sealing between the seat body 61 and the hemisphere 22. A third sealing member 66 is provided on the outer periphery of the seat body 61, and the third sealing member 66 is used for sealing between the seat body 61 and the valve body 1. The hemisphere 22 includes a spherical crown 221, and the spherical crown 221 is in squeeze contact with the second sealing member 65. In this embodiment, sealing members are provided on both the inner and outer peripheries of the inspection valve seat 6, and the sealing member on the inner periphery is in squeeze contact with the hemisphere 22 to ensure sealing between the inspection valve seat 6 and the hemisphere 22. The sealing member on the outer periphery is in squeeze contact with the valve body 1 to ensure sealing between the inspection valve seat 6 and the valve body 1. Double sealing ensures that the liquid in the valve chamber 5 will not leak out during inspection.

[0053] Since the hemispherical valve in this embodiment is an eccentric hemispherical valve, the central axis of the hemispherical body 22 (i.e., the hemispherical body axis C) and the vertical line of the valve shaft 21 (i.e., the vertical line D of the valve shaft) are not on the same straight line. Therefore, the rotation radius of one side of the hemispherical body 22 is large, and the rotation radius of the other side is small. Therefore, this embodiment takes this into consideration when setting the inspection valve seat 6. When the inspection valve seat 6 is as Figure 4 After setting (i.e. the connecting end is on the left and the movable end is on the right), at this time, the rotation radius of the left side of the hemisphere 22 is large, and the rotation radius of the right side is small. In this embodiment, the sealing valve seat is installed at the position of the second port 12, so that the hemisphere 22 only rotates back and forth between the sealing space 3 and the second port 12 to realize valve closing and opening. Since the right side of the inspection valve seat 6 is the movable end, it is lifted when not under maintenance, and will not cause position interference to the hemisphere 22, thereby avoiding the inspection valve seat 6 affecting the switch valve of the hemisphere 22.

[0054] 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 for pressure maintenance, comprising a valve body (1), a valve cover (4) provided on the valve body (1), a valve cavity (5) formed in the valve body (1), a valve flap assembly (2) provided in the valve cavity (5), the valve flap assembly (2) comprising a hemispherical body (22) and a valve shaft (21) for driving the hemispherical body (22) to rotate; characterized in that: The valve body (1) is provided with an inspection space (3) near the valve cover (4), and a movable inspection valve seat (6) is provided at the junction of the inspection space (3) and the valve cavity (5); the inspection valve seat (6) includes a connecting end and a movable end, and the inspection valve seat (6) is installed on the valve body (1) through the connecting end, and an adjusting mechanism is provided on the movable end. When the hemisphere (22) rotates to the position where the eccentric hemisphere valve is fully opened, the adjusting mechanism drives the inspection valve seat (6) to close, and the inspection valve seat (6) forms a seal with the valve body (1) and the hemisphere (22) respectively, thereby separating the inspection space (3) from the valve cavity (5).

2. The eccentric hemispherical valve for under-pressure maintenance according to claim 1, characterized in that: The inspection valve seat (6) comprises a seat body (61), and the seat body (61) is a circular ring structure; one end of the seat body (61) is a connecting end, which is hinged to the valve body (1).

3. The eccentric hemispherical valve for under-pressure maintenance according to claim 2, characterized in that: The end of the seat body (61) away from the connection end is a movable end, which is connected to the adjustment mechanism; the adjustment mechanism includes an adjustment rod (63) and a mounting block (13), the adjustment rod (63) is connected to the seat body (61), the mounting block (13) is connected to the valve body (1), and the adjustment rod (63) is threadedly connected to the mounting block (13).

4. The eccentric hemispherical valve for under-pressure maintenance according to claim 3, characterized in that: The regulating rod (63) is arranged in the maintenance space (3), and the end of the regulating rod (63) extends from the maintenance space (3) through the valve cover (4) to the outside.

5. The eccentric hemispherical valve for under-pressure maintenance according to any one of claims 2 to 4, characterized in that: A second sealing member (65) is provided on the inner periphery of the seat body (61), and the second sealing member (65) is used for sealing between the seat body (61) and the hemispherical body (22).

6. The eccentric hemispherical valve for under-pressure maintenance according to any one of claims 2 to 4, characterized in that: A third sealing member (66) is provided on the outer periphery of the seat body (61), and the third sealing member (66) is used for sealing between the seat body (61) and the valve body (1).

7. The eccentric hemispherical valve for under-pressure maintenance according to claim 3, characterized in that: A connecting piece (64) is provided at the movable end of the seat body (61), and the adjusting rod (63) is installed on the connecting piece (64).

8. The eccentric hemispherical valve for under-pressure maintenance according to claim 7, characterized in that: The connecting member (64) includes a base (641), a card slot (642) and a slide slot (643) are provided on the base (641), the adjusting rod (63) is installed in the card slot (642), and the connecting member (64) is movably installed on the base (61) through the slide slot (643).

9. The eccentric hemispherical valve for under-pressure maintenance according to claim 5, characterized in that: The hemispherical body (22) includes a spherical cap (221). When undergoing maintenance, the spherical cap (221) is in press contact with the second sealing member (65).

10. The eccentric hemispherical valve for under-pressure maintenance according to claim 1, characterized in that: A first port (11) and a second port (12) communicating with the valve cavity (5) are respectively provided on both sides of the valve body (1); a connection end of the inspection valve seat (6) is provided on a side close to the first port (11); and the hemispherical body (22) reciprocates between the inspection space (3) and the second port (12).

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