Valve seat seal of ultralow-temperature all-welded fixed ball valve

Abstract

The invention relates to the technical field of ball valves, in particular to a valve seat seal of an ultralow-temperature all-welded fixed ball valve, which comprises a middle body, a conducting ball body is arranged in the middle body, and end covers are arranged at two ends of the middle body; supporting seats are arranged at the ends, close to the middle body, of the end covers, sealing rings are arranged at the ends, close to the communicating ball body, of the supporting seats, adjusting pieces are arranged in the sealing rings, and the abutting strength of the sealing pieces to the mounting grooves and the communicating ball body is adjusted by stretching and contracting the adjusting pieces; the adjusting piece comprises spacers distributed in the sealing ring in an array mode, and the spacers divide the inner area of the sealing ring into a plurality of sections. An elastic ring is arranged in each section, and the elastic rings abut against the inner wall of the sealing ring; a telescopic part is arranged in the elastic ring; when the telescopic part is in a contraction state, the elastic ring axially extends, and the abutting force between the sealing ring and the conducting ball body is increased; when the telescopic part is in an extension state, the elastic ring extends in the radial direction, and the abutting force between the sealing ring and the mounting groove is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, and in particular to a valve seat seal of an ultra-low temperature fully welded fixed ball valve. Background Art

[0002] In the field of fluid systems, valves are core devices that regulate flow direction, pressure, and flow control. They have a wide range of applications and can effectively manage the flow of a variety of fluids. Valves play a crucial role in modern industrial systems, with ball valves performing particularly well and enjoying extensive application in numerous fluid control scenarios.

[0003] The operating mechanism of a ball valve is based on the driving action of the valve stem, which drives the ball to rotate around its own axis. This mechanical action achieves precise regulation and effective control of fluid flow, flow rate, and flow conditions. However, due to long-term erosion and corrosion, the sealing surface and valve seat of the ball valve are easily damaged, resulting in reduced sealing performance and even leakage.

[0004] Chinese patent publication number CN119914701B discloses a multi-stage sealed hydrogen ball valve, comprising a valve seat, a valve core, and a valve stem. The valve core is disposed within the valve seat. A first support is fixed to the valve seat, a second support is disposed above the first support, and the first and second supports are connected by a plurality of first connecting rods. A third support is disposed above the second support, and the second and third supports are connected by a plurality of second connecting rods. A pull-wire, a sliding plug, and an annular sac linkage mechanism actively controls the separation of the sealing seat from the valve core before the valve core rotates, eliminating friction losses caused by direct contact during the opening and closing process of traditional hard seal structures. The sealing seat only contacts when the valve is closed, and there is no relative movement during daily adjustments, significantly extending the service life of the sealing assembly.

[0005] While the aforementioned patent eliminates the friction loss caused by direct contact during the opening and closing of traditional hard seals, thereby indirectly improving the sealing performance of ball valves, in actual use, a certain gap exists between the sealing seat and the end cap during assembly. When the sealing structure in this gap degrades due to assembly stress relaxation, medium corrosion, or thermal expansion and contraction, the high-pressure fluid in the pipeline system will break through the failed sealing interface and, driven by the pressure differential, form a leakage channel along the fitting gap. This leakage not only causes fluid loss and energy waste, but is also likely to cause equipment corrosion, environmental pollution, and even safety accidents.

[0006] In conventional industrial applications, ball valves, due to their simple structure and rapid opening and closing times, are typically designed solely for media on-off control, achieving full open or closed status through ball rotation. However, when ball valves are forced to operate in non-standard operating conditions, such as flow regulation, the uneven distribution of the medium flow field can lead to localized pressure concentration on the sealing ring. This, over time, can cause irreversible plastic deformation of the sealing ring material, leading to misalignment between the sealing ring and the mounting groove. This can ultimately cause the valve's sealing performance to fail, seriously impacting the safe and stable operation of the process system. Summary of the Invention

[0007] The object of the present invention is to provide a valve seat seal for an ultra-low temperature fully welded trunnion ball valve, so as to solve the technical problems raised in the above background technology.

[0008] To achieve the above object, the present invention provides the following technical solutions: A valve seat seal for an ultra-low temperature fully welded fixed ball valve comprises a middle body, a conducting ball is arranged in the middle body, and end covers are arranged at both ends of the middle body; A support seat is provided at one end of the end cover close to the middle body, and an installation groove is provided at one end of the end cover close to the conducting ball; A sealing ring is arranged in the mounting groove and presses against the outer surface of the conductive sphere; A main sealing portion, one end of which is connected to the support base and the other end is connected to the end cover, for closing the gap between the support base and the end cover; A secondary sealing portion, which is disposed in the gap between the support seat and the end cover and presses the support seat and the end cover; The adjusting member is arranged in the sealing ring, and the pressing strength of the sealing member against the mounting groove and the conducting ball is adjusted by stretching and contracting the adjusting member.

[0009] Preferably, the support seat comprises: A first stepped ring, wherein one end of the main sealing portion is connected to the first stepped ring and the other end is connected to the end cover; The second step ring, the secondary sealing part is arranged on the second step ring, pressing the support seat and the end cover The third stepped ring, the mounting groove is arranged on the inner ring of the third stepped ring, and is used for mounting the sealing ring.

[0010] Preferably, the secondary sealing portion comprises a receiving ring, the receiving ring is arranged on the second stepped ring, and a resisting member is provided inside the receiving ring; When the support seat moves toward the end cover, the resistance piece is affected by the inner diameter of the end cover, and the two ends of the resistance piece squeeze the outer ring of the support seat and the inner ring of the end cover respectively.

[0011] Preferably, the adjusting member comprises: The spacers are arranged in an array inside the sealing ring, dividing the inner area of ​​the sealing ring into multiple sections; The elastic rings are arranged in an array inside the sealing ring and in contact with the inner wall of the sealing ring; The telescopic portion is arranged inside the elastic ring; When the telescopic portion is in a contracted state, the elastic ring stretches axially, thereby increasing the abutting force between the sealing ring and the conductive ball; when the telescopic portion is in an extended state, the elastic ring stretches radially, thereby increasing the abutting force between the sealing ring and the mounting groove.

[0012] Preferably, a telescopic member is provided inside the secondary sealing portion, and when the telescopic member is in a contracted state, the elastic ring is in an axially extended state; when the telescopic member is in an extended state, the elastic ring is in a radially extended state.

[0013] Preferably, the telescopic member comprises: The elastic tubes are arranged in an array inside the accommodating ring and are provided with a pressing portion. When the elastic tubes are in a contracted state, the pressing portion abuts against the abutment member. The traction member has one end connected to the extrusion portion and the other end connected to the elastic ring.

[0014] Preferably, the support seat is provided with an array of communication channels inside, one end of the communication channel is connected to the elastic tube, and the other end is connected to the sealing ring.

[0015] Preferably, a valve stem for driving the conducting sphere to rotate is provided on the top of the conducting sphere, and magnetic rings are provided at both ends of the conducting sphere; When the conductive sphere and the end cover are in a connected state, the magnetic ring magnetically attracts the telescopic part to radially compress the elastic ring; when the conductive sphere and the end cover are in a disconnected state, the magnetic ring releases the magnetic attraction to the telescopic part to radially extend the elastic ring.

[0016] Preferably, a limiting portion is provided on the installation groove, and the limiting portion is used to clamp the sealing ring.

[0017] Preferably, the center point of the elastic ring is located on the side of the limiting portion facing the end cover.

[0018] Technical effects and advantages of the present invention: 1. The present invention provides an elastic ring. When the conducting ball and the end cover are in a conducting state, the magnetic ring causes the telescopic part to contract, the short axis of the elastic ring to shorten, and the long axis to lengthen. The traction member pushes the extrusion part to move, which not only causes the elastic tube to contract, but also allows gas to enter the sealing ring to expand, thereby enhancing the fit with the conducting ball; it also increases the pressure of the resistance member on the support seat and the end cover, thereby improving the performance of the secondary sealing part; when the conducting ball and the end cover are in an adjusted state, the magnetic attraction of the magnetic ring on the telescopic part is weakened, the short axis of the elastic ring is extended, and the long axis is shortened, thereby enhancing the radial extrusion force on the sealing ring, and the center point position setting can improve the clamping effect of the limit part, thereby avoiding misalignment of the sealing ring and the installation groove of the ball valve under non-standard working conditions, thereby ensuring the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the main structure of the present invention; Figure 2 It is a structural schematic diagram of the conductive sphere of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the main structure of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the enlarged structure at A in the middle; Figure 5 This is a schematic structural diagram of the conductive ball of the present invention when it is in an adjustment state; Figure 6 It is a structural schematic diagram of the support base of the present invention; Figure 7 Schematic diagram of the installation structure of the main sealing part and the secondary sealing part of the present invention; Figure 8 It is a structural schematic diagram of the telescopic member of the present invention; Figure 9 It is a structural schematic diagram of the adjusting member of the present invention; Figure 10 Schematic diagram of the cross-sectional structure of the support seat of the present invention; Figure 11 Schematic diagram of the structure of the magnetic ring of the present invention.

[0020] In the picture: 100, middle body; 200, end cover; 300, valve stem; 400, conducting ball; 1. Support seat; 101. First step ring; 102. Second step ring; 103. Third step ring; 2. Mounting slot; 3. Limiting part; 4. Sealing ring; 5. Adjusting member; 501. Spacer; 502. Elastic ring; 503. Telescopic portion; 6. Telescopic member; 601. Elastic tube; 602. Extrusion part; 603. Pulling member; 7. main sealing part; 8. auxiliary sealing part; 801. containing ring; 802. abutting piece; 9. magnetic ring; 10. communication channel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0022] Embodiment one During the assembly of the ball valve, there is a certain gap between the support seat 1 and the end cover 200. When the sealing structure at the gap is degraded due to assembly stress relaxation, medium corrosion or thermal expansion and contraction effect, the high-pressure fluid medium in the pipeline system will break through the failed sealing interface and form a leakage channel along the fitting gap under the driving of pressure difference. Such medium leakage not only causes working medium loss and energy waste, but also may cause equipment corrosion, environmental pollution and even safety accidents. In view of this, the present application provides a technical solution for improving the gap plugging effect between the support seat 1 and the end cover 200, as follows: Referring to Figures 1 to 10 The present application provides a valve seat seal of a super-low-temperature full-welding fixed ball valve, which comprises a middle body 100, the two ends of the middle body 100 are provided with end covers 200, the middle body 100 is provided with a through ball body 400, and the top of the through ball body 400 is provided with a valve stem 300 for driving the through ball body 400 to rotate.

[0023] The end cover 200 is provided with a support seat 1 close to the middle body 100, the support seat 1 is provided with a mounting groove 2 close to the through ball body 400, the mounting groove 2 is provided with a sealing ring 4, and the sealing ring 4 is in abutting pressure with the outer surface of the through ball body 400.

[0024] Referring to Figure 6 The support seat 1 is arranged in steps, the end cover 200 is provided with a stepped groove matched with the support seat 1, the support seat 1 comprises a first stepped ring 101, a second stepped ring 102 and a third stepped ring 103, the first stepped ring 101 is provided with a main sealing part 7 between the end cover 200; the second stepped ring 102 is provided with an auxiliary sealing part 8 between the end cover 200; and the mounting groove 2 is arranged in the inner circle of the third stepped ring 103 for mounting the sealing ring 4.

[0025] The main sealing portion 7 includes a double-layer bellows, one end of which is connected to the first stepped ring 101 , and the other end of which is connected to the end cover 200 .

[0026] Reference Figure 10 As shown, the secondary sealing portion 8 includes a receiving ring 801 , which is disposed between the second step ring 102 and the end cover 200 , and an abutment member 802 is disposed inside the receiving ring 801 .

[0027] The resisting member 802 includes a V-shaped spring piece. When the support base 1 moves into the end cover 200 , the V-shaped spring piece is affected by the inner diameter of the end cover 200 , and its two ends squeeze the outer ring of the support base 1 and the inner ring of the end cover 200 respectively.

[0028] In this embodiment, the ball valve drives the conducting ball 400 to rotate inside the middle body 100 through the valve stem 300 to switch the working state. A conducting channel is opened in the middle of the conducting ball 400. When the central axis of the conducting channel coincides with the central axis of the end cover 200, the conducting ball 400 and the end cover 200 are in a conducting state (specifically, Figure 3 When the central axis of the conducting channel is perpendicular to the central axis of the end cap 200, the conducting ball 400 and the end cap 200 are in a non-conducting state. The technology for switching the operating state of the ball valve belongs to the existing technology and will not be described in detail here.

[0029] During the state switching of the conducting ball 400 inside the middle body 100, the sealing ring 4 on the support seat 1 fits tightly with the outer surface of the conducting ball 400, thereby completing the sealing operation between the support seat 1 and the conducting ball 400, ensuring that there will be no medium leakage during the operation of the ball valve.

[0030] like Figure 3 and Figure 4 As shown, a primary seal 7 is provided between the first stepped ring 101 and the end cap 200. One end of the primary seal 7 is fixedly connected to the first stepped ring 101, and the other end is fixedly connected to the end cap 200. The primary seal 7 provides a primary seal for the gap between the support seat 1 and the end cap 200, effectively preventing leakage of the flowing medium through this gap and ensuring the sealing performance of the ball valve.

[0031] Between the second step ring 102 and the end cover 200, there is provided a containing ring 801 fixedly connected to the second step ring 102. A V-shaped resistance member 802 is provided inside the containing ring 801. During the installation of the support seat 1 and the end cover 200, the inner diameter of the end cover 200 will exert a pressing effect on the resistance member 802, so that the two ends of the resistance member 802 are close to each other. According to the principle of interaction of forces, in the process of the resistance member 802 being pressed, a reverse resistance force will be simultaneously applied to the first step ring 101 and the end cover 200, thereby forming a secondary seal. With the design of this double sealing structure, even if the main sealing part 7 is damaged, the secondary sealing part 8 can still ensure the sealing performance of the ball valve, thereby improving the reliability and safety of the ball valve.

[0032] Example 2 Although the above embodiment uses the main sealing part 7 and the secondary sealing part 8 to seal the gap between the support seat 1 and the end cover 200, in actual use, the ball valve is usually only used as an on-off valve. However, when the ball valve is forced to be used in non-standard working conditions such as flow regulation, its sealing ring 4 will cause local pressure concentration due to the uneven distribution of the medium flow field. Under long-term action, the sealing ring 4 material will undergo irreversible plastic deformation, which will cause the sealing ring 4 and the installation groove 2 to be misaligned, ultimately causing the valve sealing performance to fail, seriously affecting the safe and stable operation of the process system. In view of this, technical improvements are made on the basis of Example 1, and the improved technical solution is as follows: Reference Figures 1 to 11 As shown, the present invention provides a valve seat seal for an ultra-low temperature fully welded fixed ball valve, including an adjusting member 5, which is arranged in a sealing ring 4. By stretching and contracting the adjusting member 5, the pressure strength of the sealing member on the mounting groove 2 and the conducting ball 400 is adjusted.

[0033] Reference Figure 9 As shown, the regulating member 5 includes an array of spacers 501 distributed inside the sealing ring 4. The spacers 501 divide the inner area of ​​the sealing ring 4 into multiple sections. An elastic ring 502 is provided in each section. The elastic ring 502 contacts the inner wall of the sealing ring 4. A telescopic portion 503 is provided inside the elastic ring 502. When the telescopic portion 503 is in a contracted state, the elastic ring 502 stretches axially, increasing the pressure between the sealing ring 4 and the conductive ball 400; when the telescopic portion 503 is in an extended state, the elastic ring 502 stretches radially, increasing the pressure between the sealing ring 4 and the mounting groove 2.

[0034] Reference Figure 8 As shown, a telescopic member 6 is provided inside the secondary sealing portion 8. When the telescopic member 6 is in a contracted state, the elastic ring 502 is in an axially extended state; when the telescopic member 6 is in an extended state, the elastic ring 502 is in a radially extended state.

[0035] The telescopic member 6 includes an elastic tube 601 arrayed inside the accommodating ring 801 , an extrusion portion 602 is provided on the elastic tube 601 , and a traction member 603 is provided between the extrusion portion 602 and the elastic ring 502 . The telescopic member 6 adjusts the telescopic state of the elastic ring 502 through the traction member 603 .

[0036] It should be noted that: since the resistance member 802 includes a V-shaped spring piece, the extrusion portion 602 is located in the middle of the resistance member 802. When the elastic tube 601 is in a contracted state, the extrusion portion 602 moves toward the direction of the third step ring 103. During this process, the extrusion portion 602 squeezes the inner side of the V-shaped spring piece so that the two ends of the resistance member 802 squeeze the outer ring of the support seat 1 and the inner ring of the end cover 200 respectively.

[0037] The support base 1 is provided with an array of communication channels 10 inside. One end of the communication channel 10 is connected to the elastic tube 601 , and the other end is connected to the sealing ring 4 .

[0038] The traction member 603 is connected to the extrusion portion 602 and the elastic ring 502 through the communication channel 10. The elastic ring 502 is elliptical in shape, and the traction member 603 is connected to the quadrant of the elastic ring 502 that faces the conductive sphere 400. The elastic ring 502 has a through hole on its exterior to allow the gas inside the elastic ring 502 to enter the interior of the sealing ring 4 through the through hole.

[0039] A valve stem 300 is provided at the top of the conducting sphere 400 for driving the conducting sphere 400 to rotate, and magnetic rings 9 are provided at both ends of the conducting sphere 400; when the conducting sphere 400 and the end cover 200 are in a connected state, the magnetic ring 9 magnetically attracts the telescopic part 503 to radially compress the elastic ring 502; when the conducting sphere 400 and the end cover 200 are in a non-connected state, the magnetic ring 9 releases the magnetic attraction to the telescopic part 503 to radially extend the elastic ring 502.

[0040] The telescopic portion 503 includes a magnetic telescopic rod. The magnetic telescopic rod is telescopically moved under the influence of magnetic force, which belongs to the prior art and will not be described in detail here.

[0041] The mounting groove 2 is provided with a limiting portion 3 for clamping the sealing ring 4. The center point of the elastic ring 502 is located on the side of the limiting portion 3 facing the end cover 200.

[0042] When the conductive sphere 400 and the end cap 200 are in a conductive state, the magnetic ring 9 provided on the conductive sphere 400 is located on the side of the stopper 3 facing the primary sealing portion 7, and the magnetic ring 9 and the telescopic portion 503 are aligned in a straight line. In this situation, the magnetic ring 9 exerts a magnetic attraction on the telescopic portion 503, causing it to contract. During the contraction of the telescopic portion 503, a tensile force is applied to the minor axis of the elliptical elastic ring 502, thereby shortening the minor axis and lengthening the major axis of the elliptical elastic ring 502, thereby increasing the ellipticity. Since one end of the traction member 603 is connected to the extrusion portion 602 and the other end is connected to the quadrant of the elastic ring 502 facing the conductive sphere 400, when the major axis of the elliptical elastic ring 502 extends, the elastic ring 502 exerts a tensile force on the extrusion portion 602 through the traction member 603, pushing the extrusion portion 602 toward the elastic ring 502. On the one hand, the extrusion part 602 exerts an extrusion effect on the elastic tube 601, causing the elastic tube 601 to gradually shrink, and the gas inside the elastic tube 601 enters the sealing ring 4 through the connecting channel 10, causing the sealing ring 4 to further expand, thereby enhancing the tightness of the fit between the sealing ring 4 and the conducting ball 400; on the other hand, during the movement of the extrusion part 602, its outer side will simultaneously apply a pushing force to the inner side of the resistance member 802, thereby increasing the resistance pressure of the two ends of the resistance member 802 on the support seat 1 and the end cover 200, thereby improving the sealing performance of the secondary sealing part 8.

[0043] It should be noted that: the elastic tube 601 includes a mounting ring fixedly connected to the resistance member 802, and an elastic telescopic tube is provided at one end of the mounting ring facing the opening of the resistance member 802; the traction member 603 passes through the mounting ring and is connected to the extrusion portion 602 provided at the end of the elastic telescopic tube. When the two free ends of the resistance member 802 approach each other, the resistance member 802 does not contact the elastic telescopic tube.

[0044] When the conductive ball 400 and the end cap 200 are in the adjustment state (specifically, Figure 5 As shown in the figure, the magnetic ring 9 on the conductive sphere 400 deflects, causing a portion of the magnetic ring 9 to intersect with the telescopic portion 503. When the magnetic ring 9 and the telescopic portion 503 intersect, the magnetic attraction of the magnetic ring 9 on the telescopic portion 503 weakens. At this point, the elastic restoring force of the elastic tube 601 causes the extrusion portion 602 to gradually move toward the primary sealing portion 7.

[0045] During this process, the extrusion portion 602 applies a pulling force to the elliptical elastic ring 502 toward the quadrant point of the conducting sphere 400 through the traction member 603, so that the minor axis of the elliptical elastic ring 502 is extended and the major axis is shortened, thereby increasing the radial extrusion force of the elastic ring 502 on the sealing ring 4. At the same time, since the center point of the elastic ring 502 is located on the side of the limiting portion 3 facing the end cap 200 (specifically, Figure 10As shown in FIG, during the extension of the minor axis of the elliptical elastic ring 502, the clamping effect of the limit portion 3 on the elastic ring 502 can be improved, thereby avoiding the phenomenon that the sealing ring 4 and the mounting groove 2 are misaligned due to the uneven distribution of pressure exerted by the flowing medium on the sealing ring 4 when the ball valve is forced to be used in non-standard working conditions such as flow regulation.

[0046] It should be noted that: in this embodiment, the elastic ring 502 is only placed inside the sealing ring 4, and there is no fixed connection between the two. Therefore, during the contraction of the elastic ring 502, the outer part of the sealing ring 4 will not be driven to contract inward, that is, the fitting effect between the sealing ring 4 and the conductive ball 400 will not be changed.

[0047] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

[0048] While embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A valve seat seal for an ultra-low temperature fully welded fixed ball valve, comprising a middle body (100), a conducting ball (400) disposed in the middle body (100), and end covers (200) disposed at both ends of the middle body (100), characterized in that: A support seat (1) is provided at one end of the end cover (200) close to the middle body (100), and a mounting groove (2) is provided at one end close to the conducting sphere (400); A sealing ring (4) is disposed in the mounting groove (2) and presses against the outer surface of the conductive ball (400); A main sealing portion (7), one end of which is connected to the support base (1) and the other end of which is connected to the end cover (200), for closing the gap between the support base (1) and the end cover (200); A secondary sealing portion (8) is disposed in a gap between the support seat (1) and the end cover (200) and presses the support seat (1) and the end cover (200); The adjusting member (5) is arranged in the sealing ring (4), and the pressing strength of the sealing member against the mounting groove (2) and the conducting ball (400) is adjusted by stretching and contracting the adjusting member (5).

2. The valve seat seal of the ultra-low temperature fully welded trunnion-mounted ball valve according to claim 1 is characterized in that: The support seat (1) comprises: A first stepped ring (101), one end of the main sealing portion (7) is connected to the first stepped ring (101), and the other end is connected to the end cover (200); The second stepped ring (102), the secondary sealing portion (8) is arranged on the second stepped ring (102), and presses the support seat (1) and the end cover (200) The third stepped ring (103), the mounting groove (2) is provided on the inner ring of the third stepped ring (103) and is used for mounting the sealing ring (4).

3. The valve seat seal of the ultra-low temperature fully welded trunnion-mounted ball valve according to claim 2, characterized in that: The secondary sealing portion (8) comprises a containing ring (801), the containing ring (801) is arranged on the second stepped ring (102), and a resisting member (802) is provided inside the containing ring (801); When the support seat (1) moves into the end cover (200), the resistance member (802) is affected by the inner diameter of the end cover (200), and the two ends of the resistance member (802) respectively squeeze the outer ring of the support seat (1) and the inner ring of the end cover (200).

4. The valve seat seal of the ultra-low temperature fully welded trunnion-mounted ball valve according to claim 1, characterized in that: The regulating member (5) comprises: Spacers (501), whose array is distributed inside the sealing ring (4), dividing the inner area of ​​the sealing ring (4) into a plurality of sections; An elastic ring (502) whose array is distributed inside the sealing ring (4) and contacts the inner wall of the sealing ring (4); a telescopic portion (503) disposed inside the elastic ring (502); When the telescopic portion (503) is in a contracted state, the elastic ring (502) is axially extended, thereby increasing the abutting force between the sealing ring (4) and the conductive sphere (400); when the telescopic portion (503) is in an extended state, the elastic ring (502) is radially extended, thereby increasing the abutting force between the sealing ring (4) and the mounting groove (2).

5. The valve seat seal of the ultra-low temperature fully welded trunnion-mounted ball valve according to claim 4, characterized in that: A telescopic member (6) is provided inside the secondary sealing portion (8); when the telescopic member (6) is in a contracted state, the elastic ring (502) is in an axially extended state; when the telescopic member (6) is in an extended state, the elastic ring (502) is in a radially extended state.

6. The valve seat seal of the ultra-low temperature fully welded trunnion mounted ball valve according to claim 5, characterized in that: The telescopic member (6) comprises: The elastic tubes (601) are arranged in an array inside the accommodating ring (801), and are provided with a pressing portion (602). When the elastic tubes (601) are in a contracted state, the pressing portion (602) abuts against the abutting member (802); The traction member (603) has one end connected to the extrusion portion (602) and the other end connected to the elastic ring (502).

7. The valve seat seal of the ultra-low temperature fully welded trunnion mounted ball valve according to claim 6, characterized in that: The support seat (1) is provided with communicating channels (10) distributed in an array inside, one end of the communicating channel (10) is connected to the elastic cylinder (601), and the other end is connected to the sealing ring (4).

8. The valve seat seal of the ultra-low temperature fully welded trunnion mounted ball valve according to claim 4, characterized in that: A valve stem (300) for driving the conducting sphere (400) to rotate is provided on the top of the conducting sphere (400), and magnetic rings (9) are provided at both ends of the conducting sphere (400); When the conducting sphere (400) and the end cover (200) are in a connected state, the magnetic ring (9) magnetically attracts the telescopic portion (503) to radially compress the elastic ring (502); when the conducting sphere (400) and the end cover (200) are in a disconnected state, the magnetic ring (9) releases the magnetic attraction of the telescopic portion (503) to radially extend the elastic ring (502).

9. The valve seat seal of the ultra-low temperature fully welded trunnion mounted ball valve according to claim 4, characterized in that: A limiting portion (3) is provided on the installation groove (2), and the limiting portion (3) is used to clamp the sealing ring (4).

10. The valve seat seal of the ultra-low temperature fully welded trunnion mounted ball valve according to claim 9, characterized in that: The center point of the elastic ring (502) is located on the side of the limiting portion (3) facing the end cover (200).

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