Ultra-low temperature soft sealing ball valve

Abstract

The present invention discloses an ultra-low temperature soft-sealed ball valve, comprising: a valve body, a valve cavity in the valve body, a mounting channel connected to the valve cavity on the valve body, a ball with a through hole movably arranged in the valve cavity; a valve stem, which is rotatably inserted in the mounting channel, and the valve stem and the ball are linked and cooperated; two valve seats, the two valve seats are symmetrically arranged on both sides of the valve cavity, and the valve seat is located between the ball and the valve body; wherein a first elastic compensation component is arranged between at least one valve seat and the valve body, and the first elastic compensation component acts on the valve seat to keep the valve seat and the ball in a pre-tightened sealing state. The first elastic compensation component provides a pre-tightening force to the valve seat, so that the valve seat and the ball are in a continuously pre-tightened sealing state, which increases the tightness of the seal, has good stability, is conducive to preventing impurities from penetrating between the valve body and the outer wall of the ball, and is durable.

Description

Technical Field

[0001] The invention relates to the technical field of valve devices, and in particular to an ultra-low temperature soft sealing ball valve. Background Art

[0002] Among valves, a ball valve is a valve whose opening and closing part is a ball. The ball is driven by the valve stem and rotates around the axis of the valve stem. Ball valves are widely used in the control process of general fluid media due to their compact structure, easy operation and maintenance. However, in ultra-low temperature media or ultra-low temperature working environments, the sealing between the valve seat and the ball is reduced due to the cooling and shrinkage of the valve seat. When in use, the friction between the ball and the valve seat increases, and there is a problem of large operating torque, which makes it inconvenient to use. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides an ultra-low temperature soft sealing ball valve, which has good sealing performance and is easy to use.

[0004] According to an embodiment of the present invention, an ultra-low temperature soft-sealed ball valve comprises: a valve body, wherein the valve body has a valve cavity, the valve body is provided with an installation channel connected to the valve cavity, and a ball with a through hole is movably arranged in the valve cavity; a valve stem, which is rotatably inserted in the installation channel, and the valve stem is linked with the ball; two valve seats, the two valve seats are symmetrically arranged on both sides of the valve cavity, and the valve seats are located between the ball and the valve body; wherein a first elastic compensation component is arranged between at least one of the valve seats and the valve body, and the first elastic compensation component acts on the valve seat to keep the valve seat and the ball in a pre-tightened sealing state.

[0005] The ultra-low temperature soft-sealed ball valve according to the embodiment of the present invention has at least the following beneficial effects: by adopting the above-mentioned structure, when the sealing performance between the ball and the valve seat decreases due to factors such as cooling shrinkage of the valve seat, the first elastic compensation component provides a pre-tightening force to the valve seat, so that the valve seat and the ball are in a continuously pre-tightened sealing state, which increases the tightness of the seal and has better stability, which is conducive to preventing impurities from penetrating between the valve body and the outer wall of the ball, and is durable.

[0006] According to some embodiments of the present invention, the first elastic compensation component includes: a first gasket, which is movably arranged in the valve cavity, and one end face of the first gasket abuts against the valve seat; a first elastic member, one end of the first elastic member abuts against the first gasket, and the other end of the first elastic member abuts against the valve cavity. With the above structure, when the valve stem rotates, the ball is driven to rotate relative to the valve cavity in the valve body. By providing the first elastic member and the first gasket, the first elastic member can be deformed and push the first gasket to move toward the valve seat, so that the first elastic member provides a pre-tightening force to the valve seat through the first gasket. Therefore, when the valve seat cools and shrinks, the valve seat can be pushed by the first elastic member to fit closely with the ball to ensure its sealing performance, thereby improving the sealing between the valve seat and the ball. It is not only simple in structure, compact and reasonable, but also has good stability and is easy to assemble and maintain.

[0007] According to some embodiments of the present invention, a limiting step portion for limiting the moving distance of the ball of the first gasket is provided on one side of the valve cavity. It should be noted that the limiting step portion is an annular surface, the first gasket is an annular gasket, the inner diameter of the limiting step portion is smaller than the inner diameter of the first gasket, and when the first gasket moves away from the valve seat, the limiting step portion abuts against one side of the first gasket to limit the moving distance of the first gasket, so that the cooperation between the valve seat, the first gasket and the first elastic member is more reasonable, the first gasket is not easy to separate from the valve body, the structure is compact, and the stability is good.

[0008] According to some embodiments of the present invention, the valve seat is provided with a first end face that contacts and cooperates with the ball and a second end face that contacts and cooperates with the first elastic compensation component; a first groove is arranged around the first end face, and a second groove is arranged around the second end face, and the first groove and the second groove are arranged opposite to each other to form a buffer. With the above structure, due to the effects of the first groove and the second groove, the connection rigidity of the buffer part will be reduced and it has a certain elasticity. When the valve seat cools and shrinks, the first end face and the second end face are squeezed by the ball, and the buffer part can produce local deformation, so that the valve seat is not easy to lock the switch valve ball, thereby ensuring its normal working performance.

[0009] According to some embodiments of the present invention, the valve body includes a main body component and a bracket component connected to the main body component, the valve cavity is arranged on the main body component, the two ends of the main body component are opened, the installation channel includes a first channel and a second channel docked and connected to the first channel, the first channel is opened on the main body component and connected to the valve cavity, and the second channel is opened in the bracket component; the valve stem is sequentially inserted into the first channel and the second channel, and a packing layer for sealing the valve stem and the second channel is arranged between the valve stem and the second channel. The structure is compact and reasonable, easy to operate, and has good sealing performance.

[0010] According to some embodiments of the present invention, a second elastic compensation component is provided between the valve stem and the second channel, and the second elastic compensation component acts on the packing layer to keep the packing layer in a pre-tightened and sealed state. With the above structure, when the sealing performance of the packing layer decreases due to factors such as wear, the second elastic compensation component provides a pre-tightening force to the packing layer, so that the packing layer is in a continuously pre-tightened and sealed state, the tightness of the seal is increased, and the stability is good. For some toxic, harmful, flammable, and explosive gas environments, leakage at the valve stem can be effectively prevented.

[0011] According to some embodiments of the present invention, the second elastic compensation component includes: a glam, which is sleeved on the valve stem and pressed against the upper side of the packing layer; a second elastic member, which is pressed against the upper side of the glam; a valve stem nut, which is screwed on the valve stem and pressed against the upper side of the second elastic member; a second gasket, which is sleeved on the outer side of the valve stem nut and cooperates with the valve stem. With the above structure, the glam is pushed by the second elastic member, so that the glam can push and load the packing layer, and the second elastic member provides a pre-tightening force to the packing layer, so that when the packing layer is worn, the packing layer can be loaded to ensure its sealing performance, thereby improving the sealing between the valve stem and the valve body. It is not only simple in structure, compact and reasonable, but also has good stability.

[0012] According to some embodiments of the present invention, a positioning plate is provided at one end of the bracket assembly away from the main body assembly, and the positioning plate cooperates with the valve stem; the bracket assembly is provided with a plurality of limiting holes for limiting the rotation angle of the positioning plate, and the plurality of limiting holes are arranged in a ring shape, and the positioning plate is provided with positioning holes that cooperate with the limiting holes. With the above structure, when the valve stem drives the ball to rotate, the positioning holes and the limiting holes can be penetrated by fixing bolts or pins, so that the valve stem rotates, and the structure is stable and reliable.

[0013] According to some embodiments of the present invention, the main body assembly includes a first shell and a second shell detachably connected to the first shell, the first shell and the second shell are both provided with a fluid channel, one end of the fluid channel is provided with a hemispherical recess, and the two hemispherical recesses are connected to form the valve cavity. With the above structure, the first shell and the second shell are detachably connected, the structure is simple, and it is easy to disassemble and assemble.

[0014] According to some embodiments of the present invention, a handle capable of driving the valve stem to rotate is provided on one end of the valve stem away from the sphere, and the valve stem can be driven to rotate by rotating the handle, which is convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0016] Figure 1 This is a schematic structural diagram of an ultra-low temperature soft sealing ball valve according to an embodiment of the present invention;

[0017] Figure 2 It is a cross-sectional schematic diagram of an ultra-low temperature soft sealing ball valve according to an embodiment of the present invention;

[0018] Figure 3 for Figure 2 A magnified schematic diagram of the structure at center A;

[0019] Figure 4 for Figure 2 A magnified schematic diagram of the structure at B in the middle;

[0020] Reference numerals:

[0021] Valve body 10, valve cavity 11, limiting step portion 111, installation channel 12, main body assembly 13, first shell 131, second shell 132, bracket assembly 14, limiting hole 141, insulation sleeve 142, first mounting seat 143, second mounting seat 144, packing layer 15, packing member 16, wear-resistant sheet 17;

[0022] The ball 20, the valve stem 30, the valve seat 40, the first groove 41, the second groove 42, and the buffer portion 43;

[0023] A first elastic compensation component 50, a first gasket 51, and a first elastic member 52;

[0024] A second elastic compensation component 60, a grommet 61, a second elastic member 62, a valve stem nut 63, a second gasket 64, a positioning plate 70, and a positioning hole 71;

[0025] Handle 81 and connector 82. DETAILED DESCRIPTION

[0026] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0028] In the description of the present invention, if there is a description of first and second, it is only for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] like Figures 1 to 3 As shown, the ultra-low temperature soft-sealed ball valve according to an embodiment of the present invention includes: a valve body 10, wherein the valve body 10 has a valve cavity 11, the valve body 10 is provided with an installation channel 12 connected to the valve cavity 11, and a ball 20 with a through hole is movably arranged in the valve cavity 11; a valve stem 30, which is rotatably inserted in the installation channel 12, and the valve stem 30 is linked with the ball 20; two valve seats 40, the two valve seats 40 are symmetrically arranged on both sides of the valve cavity 11, and the valve seats 40 are located between the ball 20 and the valve body 10; wherein, a first elastic compensation component 50 is arranged between at least one valve seat 40 and the valve body 10, and the first elastic compensation component 50 acts on the valve seat 40 to keep the valve seat 40 and the ball 20 in a pre-tightened sealing state.

[0031] According to the ultra-low temperature soft-sealed ball valve of the embodiment of the present invention, the above-mentioned structure is adopted. When the sealing performance between the ball 20 and the valve seat 40 is reduced due to factors such as cooling shrinkage of the valve seat 40, the first elastic compensation component 50 provides a pre-tightening force to the valve seat 40, so that the valve seat 40 and the ball 20 are in a continuously pre-tightened sealing state, which increases the tightness of the seal and has better stability, which is conducive to preventing impurities from penetrating between the valve body 10 and the outer wall of the ball 20, and is durable.

[0032] It is understandable that if Figures 1 to 3As shown, in some embodiments of the present invention, the first elastic compensation component 50 includes: a first gasket 51, which is movably arranged in the valve cavity 11, and one end surface of the first gasket 51 abuts against the valve seat 40; a first elastic member 52, one end of the first elastic member 52 abuts against the first gasket 51, and the other end of the first elastic member 52 abuts against the valve cavity 11. With the above structure, when the valve stem 30 rotates, the ball 20 is driven to rotate relative to the valve cavity 11 in the valve body 10. By providing the first elastic member 52 and the first gasket 51, the first elastic member 52 can be deformed and push the first gasket 51 to move toward the valve seat 40, so that the first elastic member 52 provides a pre-tightening force to the valve seat 40 through the first gasket 51. Therefore, when the valve seat 40 cools and shrinks, the valve seat 40 can be pushed by the first elastic member 52 to fit closely with the ball 20 to ensure its sealing performance, thereby improving the sealing between the valve seat 40 and the ball 20. Not only is the structure simple, compact and reasonable, but also the stability is good, and the assembly and maintenance are convenient.

[0033] It is understandable that due to the high precision requirements of the ball valve, in order to prevent the uneven fitting clearance between the valve cavity 11 and the ball 20 when the valve seat 40 cools and shrinks in an ultra-low temperature environment, so that part of the ball 20 contacts the valve cavity, and the other part has a large gap with the valve cavity 11, which makes the ball 20 have a large friction and a large operating torque when rotating. Therefore, by providing a first elastic member 52, the valve seat 40 can be elastically compensated, so that the fitting clearance between the valve cavity 11 and the ball 20 remains unchanged, which is beneficial to reduce the friction between the ball 20 and the valve seat 40, and the operating torque is small, resulting in its more convenient use.

[0034] It should be noted that the first elastic member 52 is a disc spring, which is convenient for processing and manufacturing, easy for assembly, and has good stability. Of course, in some embodiments, the first elastic member 52 may also be other elastic structures, which is not limited here.

[0035] It is understandable that if Figure 2 and Figure 3 As shown, in some embodiments of the present invention, a limiting step portion 111 is provided on one side of the valve cavity 11 for limiting the moving distance of the first gasket 51 moving away from the ball 20. It should be noted that the limiting step portion 111 is an annular surface, the first gasket 51 is an annular gasket, and the inner diameter of the limiting step portion 111 is smaller than the inner diameter of the first gasket 51. When the first gasket 51 moves away from the valve seat 40, the limiting step portion 111 abuts against one side of the first gasket 51 to limit the moving distance of the first gasket 51, so that the cooperation between the valve seat 40, the first gasket 51 and the first elastic member 52 is more reasonable, the first gasket 51 is not easy to separate from the valve body 10, the structure is compact, and the stability is good.

[0036] like Figure 2 and Figure 3As shown, in some embodiments of the present invention, the valve seat 40 is provided with a first end face in contact with the ball 20 and a second end face in contact with the first elastic compensation component 50; a first groove 41 is provided on the first end face, and a second groove 42 is provided on the second end face, and the first groove 41 and the second groove 42 are arranged opposite to each other to form a buffer portion 43. With the above structure, due to the effects of the first groove 41 and the second groove 42, the connection rigidity of the buffer portion 43 will be reduced and have a certain elasticity. When the valve seat 40 cools and shrinks, the first end face and the second end face are squeezed by the ball 20, and the buffer portion 43 can produce local deformation, so that the valve seat 40 is not easy to lock the switch valve ball, thereby ensuring its normal working performance.

[0037] It should be noted that, in some embodiments of the present invention, the cross-sections of the first groove 41 and the second groove 42 are both arc-shaped. By setting the first groove 41 and the second groove 42 to an arc-shaped structure, the stress concentration on the buffer portion 43 can be reduced when the first end face and the second end face are squeezed, which is conducive to avoiding the buffer portion 43 from breaking and causing the entire valve seat 40 to fail, thereby improving the durability of the valve seat 40. Of course, in some embodiments, the first groove 41 and the second groove 42 can also be set to other shapes, which are not limited here.

[0038] like Figures 1 to 4 As shown, in some embodiments of the present invention, the valve body 10 includes a main body component 13 and a bracket component 14 connected to the main body component 13, the valve cavity 11 is arranged on the main body component 13, and the two ends of the main body component 13 are opened. The installation channel 12 includes a first channel and a second channel docked and connected to the first channel. The first channel is opened on the main body component 13 and connected to the valve cavity 11, and the second channel is opened in the bracket component 14; the valve stem 30 is sequentially inserted into the first channel and the second channel, and a packing layer 15 for sealing the valve stem 30 and the second channel is arranged between the valve stem 30 and the second channel. The structure is compact and reasonable, easy to operate, and has good sealing performance.

[0039] It is understandable that if Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments of the present invention, a second elastic compensation component 60 is provided between the valve stem 30 and the second channel, and the second elastic compensation component 60 acts on the packing layer 15 to keep the packing layer 15 in a pre-tightened and sealed state. With the above structure, when the sealing performance of the packing layer 15 decreases due to factors such as wear, the second elastic compensation component 60 provides a pre-tightening force to the packing layer 15, so that the packing layer 15 is in a continuously pre-tightened and sealed state, which not only increases the tightness of the seal, but also has good stability. For some toxic, harmful, flammable, and explosive gas environments, leakage at the valve stem 30 can be effectively prevented.

[0040] It is understandable that if Figure 1, Figure 2 and Figure 4 As shown, in some embodiments of the present invention, the second elastic compensation component 60 includes: a glam 61, which is sleeved on the valve stem 30 and pressed against the upper side of the packing layer 15; a second elastic member 62, which is pressed against the upper side of the glam 61; a valve stem nut 63, which is screwed on the valve stem 30 and pressed against the upper side of the second elastic member 62; and a second gasket 64, which is sleeved on the outer side of the valve stem nut 63 and cooperates with the valve stem 30. With the above structure, the second elastic member 62 pushes the glam 61, so that the glam 61 can push and load the packing layer 15, and the second elastic member 62 provides a pre-tightening force to the packing layer 15, so that when the packing layer 15 is worn, the packing layer 15 can be loaded to ensure its sealing performance, thereby improving the sealing between the valve stem 30 and the valve body 10, which is not only simple in structure, compact and reasonable, but also has good stability.

[0041] It should be noted that the second elastic member 62 is a disc spring, which is convenient for processing and manufacturing, easy for assembly, and has good stability. Of course, in some embodiments, the second elastic member 62 may also be other elastic structures, which is not limited here.

[0042] It is understandable that if Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments of the present invention, it also includes a packing piece 16 filled between the valve body 10 and the valve stem 30 along the installation channel 12; wherein, a first limiting surface and a first side surface perpendicular to the first limiting surface are arranged in the installation channel 12, and a second limiting surface and a second side surface perpendicular to the second limiting surface are arranged on the valve stem 30, the first limiting surface corresponds to the second limiting surface, and the first side surface corresponds to the second side surface, the packing piece 16 includes a first packing portion and a second packing portion perpendicular to the first packing portion, the first packing portion is arranged between the first limiting surface and the second limiting surface, and the second packing portion is arranged between the first side surface and the second limiting surface, which not only plays a limiting role on the packing piece 16, but also improves the sealing effect.

[0043] It should be noted that the packing member 16 is in contact with the packing layer 15 via the wear-resistant sheet 17 , and the packing member 16 is in an L shape, but may also be in other shapes, which are not limited here.

[0044] In some embodiments of the present invention, a positioning plate 70 is provided at one end of the bracket assembly 14 away from the main assembly 13, and the positioning plate 70 cooperates with the valve stem 30; a plurality of limiting holes 141 for limiting the rotation angle of the positioning plate 70 are provided on the bracket assembly 14, and the plurality of limiting holes 141 are arranged in a ring shape, and a positioning hole 71 cooperating with the limiting hole 141 is provided on the positioning plate 70. With the above structure, when the valve stem 30 drives the ball 20 to rotate, the positioning hole 71 and the limiting hole 141 can be penetrated by a fixing bolt or a pin shaft, so that the valve stem 30 rotates, and the structure is stable and reliable.

[0045] It should be noted that, in some embodiments of the present invention, a gasket sleeved on the valve stem 30 is provided between the positioning plate 70 and the second gasket 64, and the structure is compact and durable.

[0046] The connections that can be made are, Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the main body assembly 13 includes a first shell 131 and a second shell 132 detachably connected to the first shell 131, and the first shell 131 and the second shell 132 are both provided with a fluid channel, and one end of the fluid channel is provided with a hemispherical recess, and the two hemispherical recesses are connected to form a valve cavity 11. With the above structure, the first shell 131 and the second shell 132 are detachably connected, which is not only simple in structure, compact and reasonable, but also easy to disassemble and maintain.

[0047] It should be noted that the first housing 131 and the second housing 132 may be detachably connected by a plurality of connecting bolts.

[0048] It can be understood that the bracket assembly 14 includes a hollow insulation sleeve 142 and a first mounting seat 143 and a second mounting seat 144 which are sleeved on both ends of the insulation sleeve 142. The valve stem 30 passes through the first mounting seat 143, the insulation sleeve 142 and the second mounting seat 144 in sequence. The first mounting seat 143 is detachably connected to the first shell 131 by mounting bolts, and a plurality of limiting holes 141 are arranged on the second mounting seat 144 at intervals.

[0049] In some embodiments of the present invention, the length of the insulation sleeve 142 is greater than the vertical length of the valve cavity 11, which can further delay the drop in the temperature of the working fluid in the valve cavity 11, and has a simple structure and convenient operation.

[0050] In some embodiments of the present invention, a handle 81 capable of driving the valve stem 30 to rotate is provided at one end of the valve stem 30 away from the ball 20. The valve stem 30 can be driven to rotate by rotating the handle 81, which is convenient to operate.

[0051] It should be noted that, in some embodiments of the present invention, an end of the valve stem 30 away from the sphere 20 is fixedly connected to a connecting head 82, and an insertion channel is provided on the connecting head 82. The handle 81 is penetrated by the insertion channel. A first tightening bolt and a second tightening bolt are screwed on the connecting head 82, and one end face of the first tightening bolt abuts against the valve stem 30, which can further lock and position the valve stem 30 and the connecting head 82. One end face of the second tightening bolt abuts against the handle 81, which can further lock and position the handle 81 and the connecting head 82 to avoid loosening and facilitate disassembly and assembly.

[0052] In some embodiments of the present invention, the length of the handle 81 is greater than the length of both ends of the connector 82 , and extension rods may be added to both ends of the handle 81 to facilitate user operation.

[0053] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0054] Of course, the invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the invention, and these equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. Ultra-low temperature soft sealing ball valve, characterized in that: include: A valve body (10), wherein the valve body (10) has a valve cavity (11) therein, the valve body (10) is provided with a mounting passage (12) which is in communication with the valve cavity (11), and a ball (20) having a through hole is movably arranged in the valve cavity (11); a valve stem (30) which is rotatably inserted into the installation channel (12), and the valve stem (30) is in linkage with the ball (20); two valve seats (40), the two valve seats (40) being symmetrically arranged on two sides of the valve cavity (11), the valve seats (40) being located between the ball (20) and the valve body (10); A first elastic compensation component (50) is provided between at least one of the valve seats (40) and the valve body (10), and the first elastic compensation component (50) acts on the valve seat (40) to maintain a pre-tightened sealing state between the valve seat (40) and the ball (20); The first elastic compensation component (50) comprises: A first gasket (51) is movably disposed in the valve chamber (11), and one end surface of the first gasket (51) abuts against the valve seat (40); a first elastic member (52), one end of the first elastic member (52) abutting against the first gasket (51), and the other end of the first elastic member (52) abutting against the valve chamber (11); The valve body (10) comprises a main body component (13) and a bracket component (14) connected to the main body component (13); the valve cavity (11) is arranged on the main body component (13); both ends of the main body component (13) are open; the installation channel (12) comprises a first channel and a second channel connected to and connected to the first channel; the first channel is opened on the main body component (13) and connected to the valve cavity (11); the second channel is opened on the bracket component (14); The valve stem (30) is sequentially inserted into the first channel and the second channel, and a packing layer (15) is provided between the valve stem (30) and the second channel for sealing the two. A second elastic compensation component (60) is provided between the valve stem (30) and the second channel, and the second elastic compensation component (60) acts on the packing layer (15) to keep the packing layer (15) in a pre-tightened and sealed state; The second elastic compensation component (60) comprises: A grommet (61) is sleeved on the valve stem (30) and pressed against the upper side of the packing layer (15); A second elastic member (62) pressed against the upper side of the glam (61); a valve stem nut (63) threadedly connected to the valve stem (30) and pressed against an upper side of the second elastic member (62); A second gasket (64) is sleeved on the outside of the valve stem nut (63) and is in linkage with the valve stem (30).

2. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: A limiting step portion (111) for limiting the moving distance of the first gasket (51) and the ball (20) is provided on one side of the valve cavity (11).

3. The ultra-low temperature soft sealing ball valve according to claim 1 or 2, characterized in that: The valve seat (40) is provided with a first end surface that contacts and cooperates with the ball (20) and a second end surface that contacts and cooperates with the first elastic compensation component (50); A first groove (41) is provided on the first end surface, and a second groove (42) is provided on the second end surface; the first groove (41) and the second groove (42) are arranged opposite to each other to form a buffer portion (43).

4. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: A positioning plate (70) is provided at one end of the bracket assembly (14) away from the main body assembly (13), and the positioning plate (70) is in linkage with the valve stem (30); The bracket assembly (14) is provided with a plurality of limiting holes (141) for limiting the rotation angle of the positioning plate (70); the plurality of limiting holes (141) are arranged in a ring shape; and the positioning plate (70) is provided with positioning holes (71) that cooperate with the limiting holes (141).

5. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: The main body component (13) comprises a first shell (131) and a second shell (132) detachably connected to the first shell (131), the first shell (131) and the second shell (132) are both provided with a fluid channel, one end of the fluid channel is provided with a hemispherical recess, and the two hemispherical recesses are butt-jointed to form the valve chamber (11).

6. The ultra-low temperature soft sealing ball valve according to claim 1, characterized in that: A handle (81) capable of driving the valve stem (30) to rotate is provided at one end of the valve stem (30) away from the spherical body (20).

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