Eccentric semi-ball valve capable of being overhauled under pressure

Abstract

The invention 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 hemispheroid can be conveniently and quickly overhauled or replaced, and the sealing element is simple in structure and convenient to operate.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and 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 pressure maintenance, including a valve body, a hemispherical body, a valve cover, a maintenance valve seat, a positioning ring, an adjusting stud, etc.; the valve cover is installed to the top of the valve body by bolts, the hemispherical body is arranged in the cavity, and is connected to the valve body through a valve stem; a maintenance port is formed on the side of the valve body close to the valve cover; the maintenance port is provided with a positioning ring, the valve cover is arranged above the positioning ring, and the maintenance valve seat is arranged below the positioning ring, the adjusting bolts pass through the valve cover, the positioning ring and the maintenance valve seat in sequence, all the adjusting studs and the valve cover are provided with sealing rings, which are evenly distributed, and there are two groups of adjusting studs, one group of descending studs is connected to the positioning ring, and the other group of ascending studs is connected to the maintenance valve seat with reverse threads, which are adjusted with orthogonal nuts to realize the lifting and lowering of the maintenance valve seat; the maintenance valve seat and the hemispherical body are both provided with sealing rings, and the lifting and lowering of the maintenance valve seat can realize the sealing opening and closing cooperation with the hemispherical body. However, the structure of this application is complicated, the operation is too cumbersome, and problems are prone to occur during pressure maintenance. Summary of the invention

[0004] 1. Technical problem to be solved by the invention

[0005] In view of the problems raised in the background technology, the present invention provides an eccentric hemispherical valve for under-pressure maintenance to solve the above problems.

[0006] 2. Technical solution

[0007] In order to achieve the above object, the technical solution provided by the present invention is:

[0008] The present invention provides an eccentric hemispherical valve for maintenance under pressure, 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; a maintenance space is arranged on the valve body close to the valve cover side, 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, the maintenance valve seat is mounted on the valve body through the connecting end, 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 maintenance valve seat to close, the maintenance valve seat forms a seal with the valve body and the hemispherical body respectively, and separates the maintenance space from the valve cavity.

[0009] As a further improvement of the present invention, the inspection valve seat comprises 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 arranged on the inner periphery of the seat body, and the second sealing member is used for sealing between the seat body and the hemispherical body.

[0013] As a further improvement of the present invention, a third sealing member is arranged 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 clamping groove and a sliding groove are provided on the base body, the adjusting rod is installed in the clamping groove, and the connecting member is movably installed on the seat body through the sliding groove.

[0016] As a further improvement of the present invention, the hemispherical body includes a spherical cap, and when maintenance is performed, the spherical cap is in compression 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 arranged on both sides of the valve body, the connecting end of the inspection valve seat is arranged on the side close to the first port, and the hemisphere reciprocates between the inspection space and the second port.

[0018] 3. Beneficial effects

[0019] Compared with the existing known technologies, the technical solution provided by the present invention has the following significant effects:

[0020] (1) The present invention provides an eccentric hemispherical valve for maintenance under pressure. To solve the problem of inconvenient 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 position of the maintenance valve seat. 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 connecting end moves slightly when the movable end moves, so that the maintenance valve seat and the hemispherical body can be in sealing contact. At this time, the maintenance space and the valve cavity are separated by the cooperation of the maintenance valve seat and the hemispherical body, so that the seal on the hemispherical body can be inspected or replaced. The hemispherical valve of the present invention 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 difficulty of product production and is convenient to operate.

[0021] (2) The present invention provides an eccentric hemispherical valve for pressure maintenance, wherein 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 present invention provides an eccentric hemispherical valve for pressure maintenance, in which sealing members are arranged on both the inner and outer peripheries of the maintenance valve seat. The sealing member on the inner periphery is in pressure contact with the hemispherical body to ensure the sealing between the maintenance valve seat and the hemispherical body. The sealing member on the outer periphery is in pressure contact with the valve body to ensure the sealing between the maintenance valve seat and the valve body. The double seal ensures that the liquid in the valve cavity will not leak out during maintenance.

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

[0024] Figure 1 It is a schematic diagram of the overall structure of the hemispherical valve of the present invention;

[0025] Figure 2 It is a front view of the hemispherical valve of the present invention;

[0026] Figure 3 It is a side view of the hemispherical valve of the present invention;

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

[0028] Figure 5 It 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 present invention;

[0029] Figure 6 It is a side view of the cooperation between the hemispherical body and the inspection valve seat in the hemispherical valve of the present invention;

[0030] Figure 7 for Figure 6 Sectional view of the middle BB plane;

[0031] Figure 8 It is a structural schematic diagram of the inspection valve seat in the present invention;

[0032] Fig. 9 It is a structural schematic diagram of the inspection valve seat in the present invention from another perspective;

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

[0034] Fig.11 A top view of the hemispherical valve of the present invention;

[0035] Fig.12 for Fig.11 Sectional view of the middle DD plane.

[0036] Explanation 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 sealing piece; 3. Maintenance space; 4. Valve cover; 5. Valve cavity; 6. Maintenance valve seat; 61. Seat body; 62. Pin shaft; 63. Adjusting rod; 64. Connecting piece; 641. Base; 642. Slot; 643. Slide; 65. Second sealing piece; 66. Third sealing piece; C. Hemisphere axis; D. Vertical line of valve axis. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned objects, features and advantages of the invention more obvious and understandable, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by 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 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0044] Example

[0045] Combination Figure 1-Figure 3 The embodiment of the present invention is an eccentric hemispherical valve for maintenance under pressure, comprising a valve body 1. The valve body 1 of the embodiment is provided with a first port 11 and a second port 12 on both sides thereof, which are used as a water inlet and a water outlet respectively. The upper part of the valve body 1 is also provided with an opening, and a valve cover 4 is provided on the upper opening. In the 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, etc. In the embodiment, the valve cover 4 is connected to the valve body 1 by bolts, and a plurality of bolts are provided at intervals in the circumference of 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 pushed open by the liquid pressure of the valve body 1 when the hemispherical valve is used.

[0046] Combination Figure 4 In this embodiment, two spaces are formed inside the valve body 1, namely the valve cavity 5 and the maintenance space 3. Normally, the two spaces are interconnected. 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 of the valve body 1 extending upward, and the valve cover 4 is covered on the maintenance space 3 to block the opening on the maintenance space 3.

[0047] In the present 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 the present 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 a 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, and the hemisphere 22 leaves the sealing valve seat, and the liquid starts to flow, thereby 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 the figure), the hemisphere 22 is in contact with the sealing valve seat, and the liquid starts to flow. Figure 4The eccentric hemispherical valve is fully opened at this time. The hemispherical body 22 of this embodiment includes a spherical crown 221, on which a first sealing member 223 is disposed, and the first sealing member 223 is detachably mounted on the spherical crown 221 through a fixing member 222. The hemispherical body 22 of this embodiment is mounted on the valve body 1 through a valve shaft 21, and the valve shaft 21 drives the hemispherical body 22 to rotate under the drive of the driving device.

[0048] Combination Figure 5-Figure 7 In this embodiment, 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. Specifically, the connecting end of the inspection valve seat 6 is hinged to the valve body 1, and the end of the inspection valve seat 6 away from the connecting end is the movable end. Driven by the adjustment mechanism, the movable end can move, so that the inspection valve seat 6 can move in the inspection 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 it is not in the 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 with 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. The present embodiment is provided with a maintenance valve seat 6, one end of which is connected to the valve body 1 and the other end is movable. The position of the maintenance valve seat 6 is between the maintenance space 3 and the valve cavity 5. When maintenance is required, the hemispherical body 22 is rotated to the position of the maintenance valve seat 6. Since one end of the maintenance 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 maintenance space 3 and the valve cavity 5 can be separated by the cooperation of the maintenance valve seat 6 and the hemispherical body 22. At this time, the sealing member on the hemispherical body 22 can be repaired or replaced. The hemispherical valve of the present invention only needs to press one end of the maintenance valve seat 6 to achieve the sealing of the maintenance valve seat 6 and the hemispherical body 22. Its maintenance structure is simple, which reduces the production difficulty of the product and is convenient to operate.

[0049] Combination Figure 8The inspection valve seat 6 of this embodiment includes a seat body 61. Since the sealing surface of the hemispherical body 22 is circular, in order to cooperate with the hemispherical body 22 to achieve sealing, the seat body 61 is a circular ring structure. When inspection is required, the seat body 61 is completely engaged with the outer periphery of the sealing surface of the hemispherical body 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 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. In this embodiment, the adjustment rod 63 is arranged in the inspection space 3, and the end of the adjustment rod 63 passes through the valve cover 4 and extends to the outside. When inspection is required, the staff rotates the adjustment rod 63 from the outside, thereby pushing the inspection valve seat 6 to move downward and make sealing contact with the hemispherical body 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 adjusting rod 63 is mounted on the connector 64 and can rotate on the connector 64. The adjusting rod 63 is connected to the connector 64, and when the two are detachably connected, if the adjusting rod 63 is damaged, it is convenient to remove it and replace it with a new adjusting rod 63. The connecting end of the inspection valve seat 6 of this embodiment is hinged to the valve body 1, and the movable end is threadedly connected to the mounting block 13 on the valve body 1 through the adjusting rod 63. It only needs to rotate the adjusting rod 63 to realize the up and down movement of the adjusting rod 63, thereby pushing the movable end of the inspection valve seat 6 to move, which is practical and convenient.

[0051] Combination Fig. 9 and Fig.10 In this embodiment, the connecting member 64 includes a base 641, a slot 642 and a slide slot 643 are provided in 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 slot 643 and can move on the base 61. Fig.11 and Fig.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 maintains a vertical state with the valve cover 4 when moving at the movable end of the seat body 61. Fig.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 hemispherical body 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 hemispherical body 22 includes a spherical crown 221, and the spherical crown 221 is in pressure 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 pressure contact with the hemispherical body 22 to ensure the sealing between the inspection valve seat 6 and the hemispherical body 22. The sealing member on the outer periphery is in pressure contact with the valve body 1 to ensure the 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, so 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. 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 reciprocates between the sealing space 3 and the second port 12 to achieve valve closing and valve 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 present invention and its embodiments are described schematically above, and the description 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 it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. An eccentric hemispherical valve for maintenance under pressure, comprising a valve body (1), a valve cover (4) being arranged on the valve body (1), a valve cavity (5) being formed in the valve body (1), a valve flap assembly (2) being arranged 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, and 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, so as to separate the inspection space (3) from the valve cavity (5).

2. The eccentric hemispherical valve for under-pressure maintenance according to claim 1 is 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 is 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 comprises 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 is characterized in that: The adjusting rod (63) is arranged in the inspection space (3), and the end of the adjusting rod (63) extends from the inspection 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 arranged 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. An 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 arranged 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 is 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) comprises a base (641), a slot (642) and a slide groove (643) are provided on the base (641), the adjusting rod (63) is installed in the slot (642), and the connecting member (64) is movably installed on the seat (61) through the slide groove (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 compression 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 arranged on both sides of the valve body (1); a connecting end of the inspection valve seat (6) is arranged 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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