Sealing ball valve with replaceable double movable valve seats

Abstract

The invention provides a sealing ball valve with replaceable double movable valve seats, and relates to the field of ball valves, the sealing ball valve comprises a valve body, flange plates arranged at the two ends of the valve body respectively, and a threaded column arranged on the valve body, and the sealing ball valve aims to solve the technical problems that in the prior art, a ball core and the valve seats are continuously extruded due to long-term use of the ball valve, and the sealing effect is poor. In order to solve the problem that the sealing performance of the ball valve is reduced due to the fact that the valve seat is irreversibly abraded when the valve seat is damaged on one side through the arranged connecting mechanism, targeted replacement of the valve seat with one damaged side is achieved, in this way, the whole valve body and a flange plate do not need to be disassembled and reassembled, the maintenance workload and complexity are reduced, and the service life of the ball valve is prolonged. The stop time of a system is shortened, the situation that the sealing performance is reduced due to abrasion of the valve seat is prevented, and the problem that in the prior art, the sealing performance is low due to the fact that the valve seat is linearly attached to the sealing ball is solved through the arranged connecting mechanism; and through the arranged connecting mechanism, the problem that in the prior art, due to the single pre-pressure of the disc spring, the practicability of the valve seat is low is solved.

Description

Technical Field

[0001] The present invention relates to the field of ball valves, in particular to a sealing ball valve with replaceable double movable valve seats. Background Art

[0002] The double movable seat replaceable sealing ball valve is a high-performance valve, mainly used in industrial scenarios that require high sealing performance, bidirectional sealing and frequent maintenance or replacement of seals. When the existing ball valve is in use, the ball core port will continuously squeeze against the valve seat. Long-term use will cause irreversible wear of the valve seat, making the gap between the valve seat and the ball core larger, which in turn leads to reduced sealing of the ball valve.

[0003] For example, the Chinese invention patent (application number: 202310142066.3) discloses a "double movable valve seat structure for a floating ball valve and a ball valve". Its specification discloses that during the use of the ball valve, the ball core port will continuously squeeze against the valve seat, causing irreversible wear on the valve seat over time, which will further affect the fit between the valve seat and the ball core, creating a gap between the two, causing the ball valve to leak during use, thereby reducing the performance of the ball valve. The above patent can prove the defects of the existing technology.

[0004] Therefore, we have made improvements to this problem and proposed a sealing ball valve with a replaceable double movable valve seat. Summary of the Invention

[0005] The purpose of the present invention is to address the problem that long-term use of existing ball valves will cause continuous squeezing between the ball core and the valve seat, resulting in irreversible wear of the valve seat and further reduced sealing performance of the ball valve.

[0006] In order to achieve the above-mentioned object of the invention, the present invention provides a sealing ball valve with replaceable double movable valve seats to improve the above-mentioned problem.

[0007] The specific application is as follows: It includes a valve body, flanges respectively provided at both ends of the valve body, a threaded column provided on the valve body, a nut threadedly connected to the threaded column, a rotating shaft rotatably provided on the valve body, a sealing ball provided on the rotating shaft, a valve stem provided on the rotating shaft, and a connecting mechanism provided on the flange; The connecting mechanism includes a disc spring slidably arranged on the flange, a transmission seat slidably arranged on the flange, a limiting groove arranged on the transmission seat, a limiting block slidably arranged on the limiting groove, and a valve seat arranged on the limiting block.

[0008] As a preferred technical solution of the present application, a sliding column is provided on the transmission seat, a ball is rotatably provided on the sliding column, and a threaded groove is provided on the flange.

[0009] As a preferred technical solution of the present application, the valve seat and the sealing ball are matched, the ball is slidably arranged on the threaded groove, the disc spring and the transmission seat are matched, and the flange is slidably arranged on the threaded column.

[0010] As a preferred technical solution of the present application, a cavity is provided in the transmission seat, the sliding column is slidably provided in the cavity, a card slot is provided on the sliding column, a sliding slot is provided on the transmission seat, and a push block is slidably provided on the sliding slot.

[0011] As a preferred technical solution of the present application, the end of the push block is wedge-shaped, and the end of the push block is adapted to the slot.

[0012] As a preferred technical solution of the present application, a disc is provided at the bottom of the sliding column, and the disc is slidably provided on the cavity. A spring is provided on the outside of the sliding column, and the two ends of the spring are respectively provided on the corresponding surfaces of the disc and the cavity.

[0013] As a preferred technical solution of the present application, the valve seat and the sliding column are adapted to each other, and the end of the sliding groove is in a frustum shape.

[0014] As the preferred technical solution of the present application, a driving groove is provided on the flange, a driving ring is slidingly provided on the driving groove, the driving ring is adapted to the disc spring, a threaded rod is rotatably provided on the flange, and the driving ring is threadedly connected to the threaded rod.

[0015] As a preferred technical solution of the present application, a knob is provided on the threaded rod, a guide column is provided on the driving groove, and the driving ring is slidably provided on the guide column.

[0016] As a preferred technical solution of the present application, a scale is provided on the flange.

[0017] Compared with the prior art, the present invention has the following beneficial effects: In the scheme of this application: 1. To address the problem in the prior art that long-term use of ball valves can cause continuous squeezing between the ball core and the valve seat, resulting in irreversible wear of the valve seat and, in turn, reduced sealing performance of the ball valve, the present application provides a connection mechanism to achieve targeted replacement of valve seats damaged on one side. This eliminates the need to disassemble and reassemble the entire valve body and flange, reduces maintenance workload and complexity, shortens system downtime, and prevents reduced sealing performance due to valve seat wear. 2. Through the provided connection mechanism, the valve seat rotates and fits the sealing ball, making the fit between them tighter, reducing the small gap caused by the existing linear sliding fit, thereby improving the sealing performance and solving the problem of low sealing performance caused by the linear fit of the valve seat and the sealing ball in the prior art; 3. By setting up a connection mechanism and adjusting the pre-pressure of the disc spring on the valve seat, it is ensured that stable sealing performance can be maintained under different working conditions, thereby improving the practicality of the device and solving the problem of low practicality of the valve seat caused by the single pre-pressure of the disc spring in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the structure of a sealing ball valve with replaceable double movable valve seats provided in this application; Figure 2 A schematic diagram of the two-dimensional structure of the flange of the sealing ball valve with replaceable double movable valve seats provided in this application; Figure 3 Schematic diagram of the internal structure of the valve body of the sealing ball valve with replaceable double movable valve seats provided in this application; Figure 4 Schematic diagram of the internal explosion structure of the valve body of the sealing ball valve with replaceable double movable valve seats provided in this application; Figure 5 The double movable valve seat provided in this application is a replaceable sealing ball valve Figure 4 Schematic diagram of the enlarged structure of area A in the middle; Figure 6 A schematic diagram of a cross-sectional structure of a transmission seat of a sealing ball valve with replaceable double movable valve seats provided in this application; Figure 7 The double movable valve seat provided in this application is a replaceable sealing ball valve Figure 6 Schematic diagram of the enlarged structure of area B in the middle.

[0019] Indicated in the figure: 1. Valve body; 101. Flange; 102. Threaded column; 103. Nut; 104. Rotating shaft; 105. Sealing ball; 106. Valve stem; 2. Connecting mechanism; 201. Disc spring; 202. Transmission seat; 203. Limiting groove; 204. Limiting block; 205. Valve seat; 206. Sliding column; 207. Ball; 208. Threaded groove; 209. Cavity; 210. Slot; 211. Sliding groove; 212. Pushing block; 213. Disc; 214. Spring; 215. Drive groove; 216. Drive ring; 217. Threaded rod; 218. Knob; 219. Guide column; 220. Scale. DETAILED DESCRIPTION

[0020] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0021] As described in the background art, long-term use of a ball valve will cause the ball core and the valve seat to be continuously squeezed, resulting in irreversible wear of the valve seat, which in turn leads to reduced sealing performance of the ball valve.

[0022] In order to solve this technical problem, the present invention provides a sealing ball valve with a replaceable double movable valve seat, which is applied to a ball valve.

[0023] Specifically, please refer to Figure 1-Figure 7 As shown, the double movable valve seat replaceable sealing ball valve specifically includes: a valve body 1, flanges 101 respectively arranged at both ends of the valve body 1, a threaded column 102 arranged on the valve body 1, a nut 103 threadedly connected to the threaded column 102, a rotating shaft 104 rotatably arranged on the valve body 1, a sealing ball 105 arranged on the rotating shaft 104, a valve stem 106 arranged on the rotating shaft 104, and also includes a connecting mechanism 2 arranged on the flange 101. In the prior art, the flange 101 and the valve body 1 are fixed together by the cooperation of the nut 103 and the threaded column 102, and the opening and closing of the sealing ball 105 are realized by the rotation of the valve stem 106. A through hole is opened on the sealing ball 105, and fluid is transmitted through the existing through hole, such as Figure 3 As shown, this state is the open state of the sealing ball 105. When the sealing ball 105 rotates 90 degrees, the sealing ball 105 blocks the valve body 1. The disc spring 201 can provide an initial pre-pressure to ensure that a certain contact force can be maintained between the valve seat 205 and the sealing ball 105 even when there is no fluid pressure. The connecting mechanism 2 includes a disc spring 201 slidably set on the flange 101, a transmission seat 202 slidably set on the flange 101, a limiting groove 203 set on the transmission seat 202, a limiting block 204 slidably set on the limiting groove 203, and a valve seat 205 set on the limiting block 204.

[0024] The sealing ball 105 valve with a replaceable double movable valve seat 205 provided by the present invention solves the problem in the prior art that long-term use of the ball valve will cause the ball core and the valve seat 205 to be continuously squeezed, resulting in irreversible wear of the valve seat 205 and thus reducing the sealing performance of the ball valve. The present application realizes targeted replacement of the valve seat 205 damaged on one side by providing a connecting mechanism 2, thereby eliminating the need to disassemble and reassemble the entire valve body 1 and flange 101, reducing the maintenance workload and complexity, shortening the downtime of the system, and preventing the valve seat 205 from being worn and reducing the sealing performance. By providing the connection mechanism 2, the valve seat 205 can be rotated to fit the sealing ball 105, thereby making the fit between them tighter and reducing the small gap caused by the existing linear sliding fit, thereby improving the sealing performance and solving the problem of low sealing performance caused by the linear fit of the valve seat 205 to the sealing ball 105 in the prior art. By setting up the connecting mechanism 2 and adjusting the pre-pressure of the disc spring 201 on the valve seat 205, it is ensured that stable sealing performance can be maintained under different working conditions, thereby improving the practicality of the device and solving the problem in the prior art that the valve seat 205 has low practicality due to the single pre-pressure of the disc spring 201.

[0025] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0028] Example 1, please refer to Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, a sealing ball valve with a double movable valve seat and a replaceable valve seat is provided. A sliding column 206 is provided on the transmission seat 202, a ball 207 is rotatably provided on the sliding column 206, and a threaded groove 208 is provided on the flange 101; When in use, the nut 103 is rotated to separate the nut 103 from the threaded column 102. At this time, the limit between the flange 101 and the valve body 1 is released. At this time, the flange 101 is separated from the valve body 1. Figure 6As shown, the valve seat 205 is driven to move upward, and the limit block 204 on the valve seat 205 slides upward synchronously along the limit groove 203. At this time, the limit block 204 and the limit groove 203 are disengaged, and then the valve seat 205 and the transmission seat 202 are disengaged. In this way, the valve seat 205 can be quickly replaced. Quick replacement of the valve seat 205 can reduce the maintenance time of the valve body 1, thereby reducing the downtime of the system and preventing the valve seat 205 from being worn and causing the sealing to be reduced. It is fixed to the valve body 1 by the threaded column 102. When the valve seat 205 on one side of the valve body 1 is damaged, the valve seat 205 on one side is replaced in a targeted manner by rotating the nut 103 on one side. In this way, there is no need to disassemble and reassemble the entire valve body 1 and the flange 101, thereby reducing the maintenance workload and complexity. Furthermore, the valve seat 205 is adapted to the sealing ball 105 , the ball 207 is slidably disposed on the threaded groove 208 , the disc spring 201 is adapted to the transmission seat 202 , and the flange 101 is slidably disposed on the threaded column 102 ; When the valve seat 205 and the sealing ball 105 fit together, the disc spring 201 pushes the transmission seat 202, and the sliding column 206 and the ball 207 on the transmission seat 202 are displaced synchronously, and the ball 207 slides along the threaded groove 208. At this time, the transmission seat 202 slides and rotates, and the valve seat 205 and the transmission seat 202 are displaced synchronously, and then when the valve seat 205 fits the sealing ball 105, the valve seat 205 rotates to fit the sealing ball 105. Compared with the existing valve seat 205 that slides linearly and fits the sealing ball 105, the rotational fitting has dynamic adjustment capability. The valve seat 205 can automatically adjust the contact point through rotational motion to better adapt to the shape of the sealing ball 105. The rotational fitting can make the fit between the valve seat 205 and the sealing ball 105 tighter, reduce the small gap caused by the linear sliding fit, and thus improve the sealing performance. Furthermore, a cavity 209 is provided in the transmission base 202, and the sliding column 206 is slidably provided in the cavity 209. The sliding column 206 is provided with a slot 210, and the transmission base 202 is provided with a sliding slot 211. A push block 212 is slidably provided on the sliding slot 211. like Figure 7As shown, the push block 212 is inserted into the sliding groove 211 and the card groove 210. At this time, the sliding column 206 is limited on the transmission seat 202. At this time, the ball 207 and the threaded groove 208 are adapted, and the transmission seat 202 cannot be separated from the flange 101. When the disc spring 201 needs to be replaced, the push block 212 is pulled out and the push block 212 is separated from the limit of the sliding column 206. At this time, the sliding column 206 can slide along the cavity 209. At this time, the ball 207 is separated from the threaded groove 208, and the transmission seat 202 can be taken out from the flange 101. In this way, the disc spring 201 is replaced. 1 can be taken out and replaced. When replacing the valve seat 205, the corresponding flange 101 is separated from the valve body 1. The transmission seat 202 and the disc spring 201 in the flange 101 are retained on the flange 101. The valve seat 205 is directly slid upward to disengage the limit block 204 from the limit groove 203, thereby achieving quick replacement. In this way, the internal parts of the flange 101 and the valve body 1 will not affect the replacement of the valve seat 205, making the replacement operation of the valve seat 205 convenient, reducing the dependence on professional tools and skills, and improving the convenience of maintenance; Furthermore, the end of the push block 212 is wedge-shaped, and the end of the push block 212 is adapted to the slot 210. Since the end of the push block 212 is wedge-shaped, the end of the push block 212 can be quickly adapted to the slot 210. Furthermore, a disc 213 is provided at the bottom of the sliding column 206, and the disc 213 is slidably provided on the cavity 209. A spring 214 is provided on the outside of the sliding column 206, and the two ends of the spring 214 are respectively provided on the corresponding surfaces of the disc 213 and the cavity 209. When the push block 212 is released from the limit of the sliding column 206, as shown in FIG. Figure 7 As shown, the spring 214 drives the disc 213 to move upward, and the sliding column 206 and the ball 207 move upward synchronously. The ball 207 moves upward and disengages from the thread groove 208. At this time, the transmission seat 202 can be taken out of the flange 101, wherein the thread groove 208 serves as a limit for the transmission seat 202. Furthermore, the valve seat 205 and the sliding column 206 are adapted to each other, and the end of the sliding groove 211 is truncated. When the limiting block 204 on the valve seat 205 and the limiting groove 203 of the transmission seat 202 are engaged, as shown in FIG. Figure 7 As shown, the valve seat 205 limits the push block 212. When the push block 212 needs to be pulled out, the valve seat 205 needs to be separated from the transmission seat 202. The end of the sliding groove 211 is truncated cone-shaped, so that the exposed area of ​​the end of the push block 212 contacting the valve seat 205 is increased, which makes it easier for the staff to manually pull it out. The connecting mechanism 2 enables targeted replacement of the valve seat 205 that is damaged on one side, which eliminates the need to disassemble and reassemble the entire valve body 1 and flange 101, reducing maintenance workload and complexity, reducing system downtime, and preventing the valve seat 205 from being worn and causing a reduction in sealing performance. By rotating the valve seat 205 to fit the sealing ball 105, the fit between them can be tighter, reducing the tiny gap caused by the existing linear sliding fit, thereby improving the sealing performance.

[0029] Example 2, the sealing ball valve with replaceable double movable valve seats provided in Example 1 is further optimized, specifically, as follows Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 As shown, a driving groove 215 is provided on the flange 101, and a driving ring 216 is slidably provided on the driving groove 215. The driving ring 216 is adapted to the disc spring 201. A threaded rod 217 is rotatably provided on the flange 101, and the driving ring 216 is threadedly connected to the threaded rod 217. like Figure 3 As shown, when the threaded rod 217 is rotated, the threaded rod 217 rotates and drives the drive ring 216 to slide along the drive groove 215. The drive ring 216 squeezes the disc spring 201, thereby making the valve seat 205 fit more tightly against the sealing ball 105. By adjusting the pre-pressure of the disc spring 201 on the valve seat 205, it is ensured that stable sealing performance can be maintained under different working conditions, thereby improving the practicality of the device. Furthermore, a knob 218 is provided on the threaded rod 217, a guide post 219 is provided on the driving groove 215, and the driving ring 216 is slidably provided on the guide post 219. By rotating the knob 218, the knob 218 drives the threaded rod 217 to rotate, wherein the guide post 219 is used to guide the driving ring 216; Furthermore, a scale 220 is provided on the flange 101. By rotating the knobs 218 on both sides of the flange 101 to position them at the same scale 220, it is ensured that the contact force between the valve seat 205 on both sides of the valve body 1 and the sealing ball 105 is the same. The pre-pressure of the disc spring 201 on the valve seat 205 is adjusted by the connecting mechanism 2 to ensure stable sealing performance under different working conditions, thereby improving the practicality of the device.

[0030] The use process of the sealing ball valve with replaceable double movable valve seats provided by the present invention is as follows: When in use, if the valve seat 205 on one side of the valve body 1 is damaged, the nut 103 on one side is rotated to disengage the nut 103 from the threaded column 102. At this time, the limit between the flange 101 and the valve body 1 is released, and the valve seat 205 is driven to move upward, and the limit block 204 on the valve seat 205 slides upward synchronously along the limit groove 203. At this time, the limit block 204 and the limit groove 203 are disengaged, and then the valve seat 205 and the transmission seat 202 are disengaged. In this way, the valve seat 205 can be quickly replaced in a targeted manner. When the valve seat 205 and the sealing ball 105 are fitted, the transmission seat 202 is pushed by the disc spring 201, and the sliding column 206 and the ball 207 on the transmission seat 202 are displaced synchronously, and the ball 207 slides along the threaded groove 208. At this time, the transmission seat 202 slides and rotates, and the valve seat 205 and the transmission seat 202 are displaced synchronously, so that the valve seat 205 rotates to fit and seal. The ball 105 is rotated by turning the knob 218, which drives the threaded rod 217 to rotate. The threaded rod 217 rotates and drives the drive ring 216 to slide along the guide column 219. The drive ring 216 squeezes the disc spring 201, thereby making the valve seat 205 fit the sealing ball 105 more tightly. By adjusting the pre-pressure of the disc spring 201 on the valve seat 205, it is ensured that stable sealing performance can be maintained under different working conditions. When the disc spring 201 needs to be replaced, the push block 212 is pulled out, and the push block 212 is disengaged from the limit of the sliding column 206. The spring 214 drives the disc 213 to move upward. At this time, the sliding column 206 and the ball 207 move upward synchronously. The ball 207 moves upward and disengages from the adaptation of the thread groove 208. At this time, the thread groove 208 releases the limit of the transmission seat 202, so that the transmission seat 202 can be taken out from the flange 101, so that the disc spring 201 can be taken out and replaced.

[0031] In the present invention, 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, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A sealing ball valve with a double movable valve seat and a replaceable valve seat, comprising a valve body (1), flanges (101) respectively arranged at both ends of the valve body (1), a threaded column (102) arranged on the valve body (1), a nut (103) threadedly connected to the threaded column (102), a rotating shaft (104) rotatably arranged on the valve body (1), a sealing ball (105) arranged on the rotating shaft (104), and a valve stem (106) arranged on the rotating shaft (104), characterized in that: It also includes a connecting mechanism (2) provided on the flange (101); The connecting mechanism (2) comprises a disc spring (201) slidably arranged on the flange (101), a transmission seat (202) slidably arranged on the flange (101), a limiting groove (203) arranged on the transmission seat (202), a limiting block (204) slidably arranged on the limiting groove (203), and a valve seat (205) arranged on the limiting block (204).

2. A sealing ball valve with a replaceable double movable valve seat according to claim 1, characterized in that: A sliding column (206) is provided on the transmission seat (202), a ball (207) is rotatably provided on the sliding column (206), and a threaded groove (208) is provided on the flange (101).

3. A sealing ball valve with replaceable double movable valve seats according to claim 2, characterized in that: The valve seat (205) and the sealing ball (105) are matched, the ball (207) is slidably arranged on the threaded groove (208), the disc spring (201) and the transmission seat (202) are matched, and the flange (101) is slidably arranged on the threaded column (102).

4. A sealing ball valve with a replaceable double movable valve seat according to claim 3, characterized in that: A cavity (209) is provided in the transmission seat (202), the sliding column (206) is slidably provided in the cavity (209), a slot (210) is provided on the sliding column (206), a sliding slot (211) is provided on the transmission seat (202), and a push block (212) is slidably provided on the sliding slot (211).

5. A sealing ball valve with replaceable double movable valve seats according to claim 4, characterized in that: The end of the push block (212) is wedge-shaped, and the end of the push block (212) is adapted to the clamping groove (210).

6. A sealing ball valve with replaceable double movable valve seats according to claim 5, characterized in that: A disc (213) is provided at the bottom of the sliding column (206), and the disc (213) is slidably provided on the cavity (209). A spring (214) is provided on the outside of the sliding column (206), and two ends of the spring (214) are respectively provided on corresponding surfaces of the disc (213) and the cavity (209).

7. A sealing ball valve with replaceable double movable valve seats according to claim 6, characterized in that: The valve seat (205) and the sliding column (206) are adapted to each other, and the end of the sliding groove (211) is in a frustum shape.

8. The sealing ball valve with a double movable valve seat and replaceable valve seat according to claim 7, characterized in that: A driving groove (215) is provided on the flange (101), a driving ring (216) is slidably provided on the driving groove (215), the driving ring (216) is adapted to the disc spring (201), a threaded rod (217) is rotatably provided on the flange (101), and the driving ring (216) is threadedly connected to the threaded rod (217).

9. The sealing ball valve with a double movable valve seat and replaceable valve seat according to claim 8, characterized in that: A knob (218) is provided on the threaded rod (217), a guide post (219) is provided on the driving groove (215), and the driving ring (216) is slidably provided on the guide post (219).

10. A sealing ball valve with a replaceable double movable valve seat according to claim 9, characterized in that: The flange (101) is provided with a scale (220).

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