Online maintenance of ultra-low temperature high performance ball valves

Abstract

The present invention belongs to the technical field of ultra-low temperature ball valves, and specifically relates to an ultra-low temperature high-performance ball valve that can be maintained online. The valve body assembly of the present invention is a three-piece design. When in use, the inlet end pipe and the outlet end pipe are welded to the inlet pipe and the outlet pipe respectively, and the valve seat assembly, the ball body, etc. are fixed in the inner cavity of the valve body main pipe fitting. When maintenance is required, the detachable fasteners connecting the inlet connecting flange, the valve body main pipe fitting, and the outlet connecting flange are disassembled to dismantle the main structure of the ball valve. The inlet valve seat assembly and the outlet valve seat assembly are both fixed at both ends of the valve body main pipe fitting by threaded connection. Therefore, the ultra-low temperature ball valve provided by the present invention can be quickly disassembled and assembled, which is conducive to online maintenance and improves the service life of the valve.

Description

Technical Field

[0001] The invention belongs to the technical field of ultra-low temperature ball valves, and in particular relates to an ultra-low temperature high-performance ball valve for online maintenance. Background Art

[0002] A ball valve is a valve that is driven by a valve stem and rotates around the axis of the ball valve. It can be used for fluid regulation and control in the fields of petroleum, petrochemical, chemical, power plants, metallurgy, etc. In the low-temperature medium working conditions of the LNG system, higher requirements are put forward for cryogenic ball valves, and functional requirements such as online repairability, high performance, zero leakage, and long life are put forward. Existing cryogenic ball valves cannot be repaired and replaced online, or, like the common top-mounted ball valves, the number of parts to be disassembled during online repair and replacement is large, the valve structure is complex, and the space inside the valve is limited. The disassembly speed is low and the efficiency is low. The original ball, sealing ring and energy storage ring Lip-seal are easily damaged, which greatly shortens the life of the overall valve and thus scraps it in advance. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art and to provide an online repairable ultra-low temperature high-performance ball valve.

[0004] The technical solution adopted by the present invention is as follows: online maintenance of ultra-low temperature high-performance ball valve, including valve body assembly, inlet valve seat assembly, outlet valve seat assembly, ball, drive valve stem, and drive mechanism;

[0005] The valve body assembly includes an inlet end pipe, an inlet connecting flange, a valve body main pipe fitting, an outlet end pipe, and an outlet connecting flange. The inlet connecting flange and the outlet connecting flange are respectively connected and fastened to the two ends of the valve body main pipe fitting by detachable fasteners;

[0006] One end of the inlet end pipe is located in the inlet connection flange and a convex block is provided on the outer periphery of the portion located in the inlet connection flange, and a limiting convex ring is provided on the inner periphery of the inlet connection flange. The convex block provided on the inlet end pipe is located on the side of the limiting convex ring of the inlet connection flange close to the main pipe fitting of the valve body;

[0007] One end of the outlet end pipe is located in the outlet connection flange and a convex block is provided on the outer periphery of the portion located in the outlet connection flange, and a limiting convex ring is provided on the inner periphery of the outlet connection flange. The convex block provided on the outlet end pipe is located on the side of the limiting convex ring of the outlet connection flange close to the main pipe fitting of the valve body;

[0008] Both ends of the inner periphery of the valve body pipe are provided with internal threaded parts, the inlet valve seat assembly and the outlet valve seat assembly are respectively fixed to the two ends of the valve body pipe by threaded connection, the ball is arranged between the inlet valve seat assembly and the outlet valve seat assembly, the driving valve stem passes through the valve body pipe and extends into the inner cavity to connect with the ball to drive the ball to rotate to realize opening and closing;

[0009] An inlet sealing gasket is provided between the inlet end pipe and the inlet valve seat assembly. Under the tightening action of the detachable fastener, the inlet sealing gasket is squeezed by the inlet end pipe and the inlet valve seat assembly to form a sealing effect;

[0010] An outlet sealing gasket is provided between the outlet end pipe and the outlet valve seat assembly. Under the tightening action of the detachable fastener, the outlet sealing gasket is squeezed by the outlet end pipe and the outlet valve seat assembly to form a sealing effect;

[0011] The minimum spacing between the assembly formed by connecting the inlet end connecting pipe and the inlet connecting flange and the assembly formed by connecting the outlet end connecting pipe and the outlet connecting flange is a, and the maximum width of the assembly formed by connecting the valve body main pipe fitting, the inlet valve seat assembly and the outlet valve seat assembly is b, a≥b.

[0012] The inlet connection flange and the outlet connection flange are both provided with an annular groove on their outer circumferences, and the protrusion is formed by embedding four open rings in the annular groove.

[0013] The inlet valve seat assembly comprises an inlet valve seat mounting ring and an inlet valve seat arranged on the inner periphery of the inlet valve seat mounting ring. The outer periphery of the inlet valve seat mounting ring is provided with a first external threaded portion, and the first external threaded portion is threadedly matched with the internal threaded portion of one end of the valve body main pipe fitting;

[0014] The inlet valve seat installation ring is provided with a first convex ring portion on its inner periphery, the first convex ring portion is provided with a second convex ring portion on its inner periphery, the inlet valve seat comprises a first inlet valve seat portion provided on a side of the first convex ring portion close to the ball, and a second inlet valve seat portion provided on a side of the second convex ring portion close to the ball;

[0015] A plurality of first spring limiting holes arranged in an annular shape with equal intervals are provided on the end surface of the first convex ring portion close to the sphere, and a plurality of springs limited by the first spring limiting holes are provided between the first convex ring portion and the first inlet valve seat portion;

[0016] A certain distance is provided between the outer periphery of the second inlet valve seat portion and the inner periphery of the first convex ring portion to form a first sealed chamber, a single sealed energy storage ring and a first positioning ring are provided in the first sealed chamber, the sealing end of the single sealed energy storage ring is arranged toward the side away from the sphere, the first positioning ring is located on the side of the single sealed energy storage ring away from the sphere, and a first limiting convex ring is provided on the outer periphery of the second inlet valve seat portion and located on the side of the single sealed energy storage ring close to the sphere;

[0017] The end surface of the inlet valve seat that cooperates with the ball is provided with an inlet sealing ring limiting groove, and a sealing ring is embedded in the inlet sealing ring limiting groove. The sealing ring is sealingly matched with the spherical surface of the ball.

[0018] The single-seal energy storage ring includes an energy storage spring made of a hairspring alloy or INCONEL alloy, a jacket made of modified PTFE wrapped with high-strength alloy wire as the inner ribs, and a T-shaped retaining ring made of modified PTFE wrapped with high-strength alloy wire as the inner ribs. An opening is provided on the side of the jacket away from the sphere, and the energy storage spring is arranged in the opening and wrapped by the jacket to limit the position of the energy storage spring. The T-shaped retaining ring is arranged on the side of the jacket away from the sphere, and one end with a small area supports the energy storage spring.

[0019] The first positioning ring is provided with a plurality of first disassembly holes formed by radial openings arranged at equal intervals, and the inlet valve seat is provided with a plurality of second disassembly holes formed by radial openings arranged at equal intervals. The number of the first disassembly holes is equal to the number of the second disassembly holes and the positions are arranged correspondingly.

[0020] The outlet valve seat assembly comprises an outlet valve seat mounting ring, and an outlet valve seat arranged on the inner periphery of the outlet valve seat mounting ring; the outer periphery of the outlet valve seat mounting ring is provided with a second external threaded portion, and the second external threaded portion is threadedly matched with the internal threaded portion of one end of the valve body main pipe fitting;

[0021] The outlet valve seat installation ring is provided with a third convex ring portion on its inner periphery, the inner periphery of the third convex ring portion is provided with a fourth convex ring portion, the outlet valve seat comprises a first outlet valve seat portion provided on the side of the third convex ring portion close to the sphere and a second outlet valve seat portion provided on the side of the fourth convex ring portion close to the sphere;

[0022] The end surface of the third convex ring portion close to the spherical body is provided with a plurality of second spring limiting holes arranged in an annular shape with equal intervals, and a plurality of springs limited by the second spring limiting holes are provided between the third convex ring portion and the first outlet valve seat portion;

[0023] A certain distance is provided between the outer periphery of the second outlet valve seat portion and the inner periphery of the third convex ring portion to form a second sealed chamber, a double-sealed energy storage ring and a second positioning ring are provided in the second sealed chamber, both ends of the double-sealed energy storage ring are sealed ends, the second positioning ring is located on the side of the double-sealed energy storage ring away from the sphere, and a second limiting convex ring is provided on the outer periphery of the second outlet valve seat portion and located on the side of the double-sealed energy storage ring close to the sphere;

[0024] The end surface of the outlet valve seat that cooperates with the ball is provided with an outlet sealing ring limiting groove, and a sealing ring is embedded in the outlet sealing ring limiting groove, and the sealing ring is sealed and matched with the spherical surface of the ball.

[0025] The double-seal energy storage ring includes a jacket made of modified PTFE wrapped with high-strength alloy wire as the reinforcement inside, openings are provided at both ends of the jacket, and T-shaped retaining ring grooves are provided in the openings. A T-shaped retaining ring made of modified PTFE wrapped with high-strength alloy wire as the reinforcement inside is embedded in the T-shaped retaining ring groove. The T-shaped retaining ring is separated in the opening to form two limiting cavities. Energy storage springs made of hairspring alloy or INCONEL alloy are provided in the four limiting cavities at both ends, and the outer end of the T-shaped retaining ring is arranged relative to the energy storage spring and the jacket protrusion.

[0026] The second positioning ring is provided with a plurality of third disassembly holes formed by radial openings arranged at equal intervals, and the outlet valve seat is provided with a plurality of fourth disassembly holes formed by radial openings arranged at equal intervals. The number of the third disassembly holes is equal to the number of the fourth disassembly holes and the positions are arranged correspondingly.

[0027] An upper connecting hole is provided on the main pipe fitting of the valve body, a connecting sleeve is provided in the upper connecting hole, an extended valve cover is connected to the upper end of the connecting sleeve, a connecting flange is provided on the outer periphery of the connecting sleeve, a lower connecting flange is provided on the outer periphery of the lower end of the extended valve cover, the lower connecting flange on the outer periphery of the extended valve cover and the connecting flange on the outer periphery of the connecting sleeve are sequentially connected and overlapped with the main pipe fitting of the valve body and are connected and fastened by detachable fasteners;

[0028] An upper connecting flange is arranged on the outer periphery of the upper end of the extended valve cover, and a driving mechanism is connected to the upper end of the extended valve cover. The output end of the driving mechanism is connected to a driving valve stem, and the driving valve stem passes through the extended valve cover and the connecting sleeve to connect the ball in sequence.

[0029] The outer periphery of the extended valve cover is provided with a plurality of crescent-shaped heat dissipation grooves and is connected with a drip plate.

[0030] The beneficial effects of the present invention are as follows: the valve body assembly of the present invention is a three-piece design. When in use, the inlet end connecting pipe and the outlet end connecting pipe are respectively welded to the inlet pipe and the outlet pipe. The valve seat assembly, the ball, etc. are fixed in the inner cavity of the valve body main pipe fitting. When maintenance is required, the detachable fasteners connecting the inlet connecting flange, the valve body main pipe fitting, and the outlet connecting flange can be disassembled to remove the ball valve main structure. The inlet valve seat assembly and the outlet valve seat assembly are both fixed at both ends of the valve body main pipe fitting by threaded connection. Therefore, the ultra-low temperature ball valve provided by the present invention can be quickly disassembled and assembled, which is conducive to online maintenance and increases the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, without paying creative labor, other drawings obtained based on these drawings still belong to the scope of the present invention.

[0032] Figure 1 A schematic diagram of the structure of an embodiment of the present invention;

[0033] Figure 2 This is a schematic structural diagram of an inlet connecting flange (a), an inlet end connecting pipe (b) and a valve body main pipe fitting (c) according to an embodiment of the present invention;

[0034] Figure 3 for Figure 1 A magnified schematic diagram of part A;

[0035] Figure 4 It is an exploded schematic diagram of the inlet valve seat assembly;

[0036] Figure 5 It is a schematic diagram of the structure of the inlet valve seat installation ring (a), the inlet valve seat assembly (b), and the first positioning ring (c);

[0037] Figure 6 for Figure 1 A magnified schematic diagram of part B;

[0038] Figure 7 An exploded schematic diagram of the outlet valve seat assembly;

[0039] Figure 8 The schematic diagram of the structure of the outlet valve seat installation ring (a), the outlet valve seat assembly (b), and the second positioning ring (c);

[0040] Fig. 9 for Figure 1 A magnified schematic diagram of part C;

[0041] Fig.10 for Figure 1 An enlarged schematic diagram of part D in the middle;

[0042] Fig.11 It is a schematic diagram of the structure of the lip seal ring limiting convex ring part and the lip seal ring cooperating;

[0043] Fig.12 for Figure 1 The enlarged schematic diagram of part E in the middle;

[0044] In the figure, 1, ball; 2, driving valve stem; 3, driving mechanism; 401, inlet end pipe; 402, inlet connecting flange; 403, valve body main pipe fitting; 404, outlet end pipe; 405, outlet connecting flange; 406, inlet sealing gasket; 407, outlet sealing gasket; 408, internal threaded portion; 409, annular embedded groove; 410, four open rings; 411, upper connecting hole; 412, valve body main body convex ring portion; 5, inlet valve seat mounting ring; 501, first external threaded portion; 502, first convex ring portion; 503, second convex ring portion; 504, first spring limiting hole; 505, fifth convex ring portion; 6, inlet valve seat; 601, first inlet valve seat portion; 602, second inlet valve seat portion; 603, first limiting convex ring; 604, inlet sealing ring limiting groove; 605, second disassembly hole; 7, spring; 8, single sealing energy storage ring; 9, first positioning ring; 901, first disassembly hole; 10, sealing ring; 11, outlet valve seat installation ring; 1101, second external threaded portion; 1102, third convex ring portion; 1103, fourth convex ring portion; 1104, second spring limiting hole; 1105, sixth convex ring portion; 12, outlet valve seat; 1201, first outlet valve seat portion; 1202, second outlet valve seat portion; 1203, second limiting convex ring; 1205, fourth disassembly hole; 13, double-seal energy storage ring; 14, second positioning ring; 1401, third disassembly hole; 15, connecting sleeve; 16, extended valve cover; 1601, arc-shaped heat dissipation groove; 17, drip plate; 18, support valve stem; 19, bottom cover; 20, shaft sleeve; 21, lip seal ring; 22, lip seal ring limiting convex ring; 2201, guiding smooth inclined surface; 2202, limiting smooth convex surface; 23, T-shaped guide sleeve; 24, packing cover; 25, packing assembly; 26, packing gasket. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present invention more clear, the present invention will be further described in detail below with reference to the accompanying drawings.

[0046] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are for distinguishing two non-identical entities with the same name or non-identical parameters. It can be seen that "first" and "second" are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. The subsequent embodiments will not explain this one by one.

[0047] The directions and positions mentioned in the present invention, such as "upper", "lower", "front", "back", "left", "right", "inside", "outside", "top", "bottom", "side", etc., are only for reference to the directions or positions of the drawings. Therefore, the directions and positions used are for explaining and understanding the present invention, but not for limiting the scope of protection of the present invention.

[0048] like Figure 1 As shown, an online maintenance ultra-low temperature high-performance ball valve includes a valve body assembly, an inlet valve seat assembly, an outlet valve seat assembly, a ball 1, a drive valve stem 2, and a drive mechanism 3;

[0049] The valve body assembly includes an inlet end pipe 401, an inlet connection flange 402, a valve body main pipe 403, an outlet end pipe 404, and an outlet connection flange 405. The inlet connection flange 402 and the outlet connection flange 405 are respectively connected and fastened to the two ends of the valve body main pipe 403 by detachable fasteners. In this embodiment, the detachable fasteners specifically use studs and hexagonal nuts, and other detachable fasteners may also be used;

[0050] One end of the inlet end pipe 401 is located in the inlet connection flange 402 and a protrusion is provided on the outer periphery of the portion located in the inlet connection flange 402, such as Figure 2 As shown in (a), a limiting convex ring is provided on the inner periphery of the inlet connecting flange 402, and a convex block provided on the inlet end connecting pipe 401 is located on the side of the limiting convex ring of the inlet connecting flange 402 close to the valve body main pipe fitting 403;

[0051] One end of the outlet end pipe 404 is located in the outlet connection flange 405 and a convex block is provided on the outer periphery of the portion located in the outlet connection flange 405. The structure of the outlet connection flange 405 is the same as that of the inlet connection flange 402, and a limiting convex ring is also provided on the inner periphery thereof. The convex block provided on the outlet end pipe 404 is located on the side of the limiting convex ring of the outlet connection flange 405 close to the valve body main pipe fitting 403;

[0052] Specifically, Figure 2 As shown in (b), the inlet end pipe 401 is provided with an annular embedding groove 409, and the structure of the outlet end pipe 404 is the same as that of the inlet end pipe 401, and an annular embedding groove 409 is also provided on its outer periphery. Figure 3 , Figure 6 As shown, the protrusion is formed by embedding four open rings 410 in the annular embedding groove 409;

[0053] like Figure 2 As shown in (c), the valve body main pipe fitting 403 is a structure similar to a circular tube, and internal threaded parts 408 are provided at both ends of the inner circumference of the valve body main pipe fitting 403. The inlet valve seat assembly and the outlet valve seat assembly are respectively fixed to the two ends of the valve body main pipe fitting 403 through threaded connection, and the ball 1 is arranged between the inlet valve seat assembly and the outlet valve seat assembly. The driving valve stem 2 passes through the valve body main pipe fitting 403 and extends into the inner cavity to connect with the ball 1 to drive the ball 1 to rotate to realize opening and closing;

[0054] like Figure 3As shown, an inlet sealing gasket 406 is provided between the inlet end pipe 401 and the inlet valve seat assembly. Under the fastening action of the detachable fastener, the inlet sealing gasket 406 is squeezed by the inlet end pipe 401 and the inlet valve seat assembly to form a sealing effect;

[0055] like Figure 6 As shown, an outlet sealing gasket 407 is provided between the outlet end pipe 404 and the outlet valve seat assembly. Under the fastening action of the detachable fastener, the outlet sealing gasket 407 is squeezed by the outlet end pipe 404 and the outlet valve seat assembly to form a sealing effect;

[0056] The minimum distance between the assembly formed by connecting the inlet end pipe 401 with the inlet connecting flange 402 and the assembly formed by connecting the outlet end pipe 404 with the outlet connecting flange 405 is a, and the maximum width of the assembly formed by connecting the valve body main pipe 403, the inlet valve seat assembly and the outlet valve seat assembly is b, a≥b.

[0057] During actual installation, the inlet connecting flange 402 and the outlet connecting flange 405 are respectively sleeved on the inlet end pipe 401 and the outlet end pipe 404, and the inlet end pipe 401 and the outlet end pipe 404 are respectively connected to the inlet pipe and the outlet pipe by welding, and then the valve body main pipe 403, which is at least assembled with the ball, the inlet valve seat assembly, the outlet valve seat assembly, the inlet sealing gasket 406, and the outlet sealing gasket 407, is placed between the inlet end pipe 401 and the outlet end pipe 404, and then the valve body main pipe 403 is connected and fastened with the inlet end pipe 401 and the outlet end pipe 404 by detachable fasteners, i.e., the studs and hexagonal nuts used in this embodiment; when online maintenance or replacement of the seal is required, the detachable fasteners connecting the inlet connecting flange 402, the outlet connecting flange 405 and the valve body main pipe 403, i.e., the studs and hexagonal nuts used in this embodiment, are removed, and the valve body main pipe 403 and the related parts connected thereto can be directly pulled out of the pipeline as a whole, and then maintenance work is carried out.

[0058] like Figure 3-5 As shown, the inlet valve seat assembly includes an inlet valve seat mounting ring 5, and an inlet valve seat 6 arranged on the inner periphery of the inlet valve seat mounting ring 5. The outer periphery of the inlet valve seat mounting ring 5 is provided with a first external threaded portion 501, and the first external threaded portion 501 is threadedly matched with the internal threaded portion 408 at one end of the valve body main pipe fitting 403;

[0059] like Figure 5As shown in (a), the inner circumference of the inlet valve seat mounting ring 5 is provided with a first convex ring portion 502, the inner circumference of the first convex ring portion 502 is provided with a second convex ring portion 503, and the inlet valve seat 6 includes a first inlet valve seat portion 601 arranged on the side of the first convex ring portion 502 close to the ball 1 and a second inlet valve seat portion 602 arranged on the side of the second convex ring portion 503 close to the ball 1;

[0060] A plurality of first spring limiting holes 504 arranged in an annular shape with equal intervals are provided on the end surface of the first convex ring portion 502 close to the sphere 1, and a plurality of springs 7 are provided between the first convex ring portion 502 and the first inlet valve seat portion 601 and are limited by the first spring limiting holes 504;

[0061] A first sealed chamber is formed by a certain distance between the outer periphery of the second inlet valve seat portion 602 and the inner periphery of the first convex ring portion 502, wherein a single sealed energy storage ring 8 and a first positioning ring 9 are arranged in the first sealed chamber, wherein the sealing end of the single sealed energy storage ring 8 is arranged toward the side away from the sphere 1, and the first positioning ring 9 is located at the side of the single sealed energy storage ring 8 away from the sphere 1, and a first limiting convex ring 603 is arranged at the outer periphery of the second inlet valve seat portion 602 and located at the side of the single sealed energy storage ring 8 close to the sphere 1;

[0062] The end surface of the inlet valve seat 6 that cooperates with the ball 1 is provided with an inlet sealing ring limiting groove 604, and a sealing ring 10 is embedded in the inlet sealing ring limiting groove 604. The sealing ring 10 is in sealing cooperation with the spherical surface of the ball 1.

[0063] like Figure 3 As shown, the outer end of the inlet valve seat mounting ring 5 is provided with a limiting convex ring located inside the inlet sealing gasket 406, which serves to limit the inlet sealing gasket 406 and prevent the inlet sealing gasket 406 from shifting in position.

[0064] like Figure 2 As shown in (c), the valve body pipe 403 is provided with a valve body convex ring portion 412 between the internal thread portions 408 at both ends. Figure 3As shown, sealing gasket limiting ring grooves are provided on both end faces of the convex ring portion 412 of the valve body, and a sealing gasket is provided between the end face of the inlet valve seat mounting ring 5 and one end face of the convex ring portion 412 of the valve body, and the sealing gasket is limited by the sealing gasket limiting ring groove. At the same time, the inlet valve seat mounting ring 5 is provided with a fifth convex ring portion 505 located inside the convex ring portion 412 of the valve body, and a sealing groove is provided between the outer periphery of the upper end of the fifth convex ring portion 505 and the convex ring portion 412 of the valve body, and a lip seal 21 is provided in the sealing groove, and the sealing end of the lip seal 21 is arranged toward the direction of the ball 1, that is, the right side in the figure, which effectively prevents the limit. A lip seal limiting convex ring portion 22 is provided on the outer periphery of the upper end of the fifth convex ring portion 505, and the lip seal limiting convex ring portion 22 forms a limit for the lip seal 21. Through the above arrangement, leakage of the low-temperature medium from the connection between the valve body main pipe 403 and the inlet valve seat mounting ring 5 can be effectively avoided.

[0065] The single sealed energy storage ring 8 includes an energy storage spring made of a hairspring alloy or an INCONEL alloy, a jacket made of a modified PTFE wrapped with a high-strength alloy wire as a rib, and a T-shaped retaining ring made of a modified PTFE wrapped with a high-strength alloy wire as a rib. The jacket is provided with an opening on the side away from the sphere 1. The energy storage spring is arranged in the opening and is wrapped by the jacket to limit the position of the energy storage spring. The T-shaped retaining ring is arranged on the side of the jacket away from the sphere 1, and the small-area end of the jacket supports the energy storage spring. The force of the T-shaped retaining ring is transmitted from the large-area side to the small-area side, tightly supporting the energy storage spring, causing it to expand due to interference, thereby producing efficient sealing energy storage performance.

[0066] like Figure 5 As shown in (c), the first positioning ring 9 is provided with a plurality of first disassembly holes 901 formed by radial openings arranged at equal intervals, such as Figure 5 As shown in (b), the inlet valve seat 6 is provided with a plurality of second disassembly holes 605 which are arranged at equal intervals and are formed by radial openings. The number of the first disassembly holes 901 is equal to the number of the second disassembly holes 605 and the positions are arranged correspondingly.

[0067] The elastic performance of the spring 7 in the inlet valve seat assembly will decrease after long-term use, and therefore the inlet valve seat assembly needs to be disassembled and replaced. A long rod-shaped disassembly tool is inserted into the second disassembly hole 605 and the first disassembly hole 901, and then the assembly and disassembly are performed slowly so that the inlet valve seat 6, the single-seal energy storage ring 8, and the first positioning ring 9 are slowly withdrawn from the inlet valve seat mounting ring 5 to prevent wear on the single-seal energy storage ring 8. Since the preparation cost of the high-performance single-seal energy storage ring 8 is extremely high, if the single-seal energy storage ring 8 is damaged, the maintenance cost is too high. Therefore, the present embodiment can realize non-destructive disassembly and assembly of the single-seal energy storage ring 8, effectively reducing the maintenance cost of downstream users.

[0068] like Figure 6-8 As shown, the outlet valve seat assembly includes an outlet valve seat mounting ring 11, and an outlet valve seat 12 arranged on the inner periphery of the outlet valve seat mounting ring 11. The outer periphery of the outlet valve seat mounting ring 11 is provided with a second external threaded portion 1101, and the second external threaded portion 1101 is threadedly matched with the internal threaded portion 408 at one end of the valve body main pipe fitting 403;

[0069] like Figure 8 As shown in (a), the outlet valve seat mounting ring 11 is provided with a third convex ring portion 1102 on its inner periphery, the third convex ring portion 1102 is provided with a fourth convex ring portion 1103 on its inner periphery, and the outlet valve seat 12 comprises a first outlet valve seat portion 1201 provided on a side of the third convex ring portion 1102 close to the sphere 1 and a second outlet valve seat portion 1202 provided on a side of the fourth convex ring portion 1103 close to the sphere 1;

[0070] The end surface of the third convex ring portion 1102 close to the sphere 1 is provided with a plurality of second spring limiting holes 1104 arranged in an annular shape with equal spacing, and a plurality of springs 7 limited by the second spring limiting holes 1104 are provided between the third convex ring portion 1102 and the first outlet valve seat portion 1201;

[0071] A certain distance is provided between the outer periphery of the second outlet valve seat portion 1202 and the inner periphery of the third convex ring portion 1102 to form a second sealed chamber, a double-sealed energy storage ring 13 and a second positioning ring 14 are provided in the second sealed chamber, both ends of the double-sealed energy storage ring 13 are sealed ends, the second positioning ring 14 is located on the side of the double-sealed energy storage ring 13 away from the sphere 1, and a second limiting convex ring 1203 is provided on the outer periphery of the second outlet valve seat portion 1202 and located on the side of the double-sealed energy storage ring 13 close to the sphere 1;

[0072] The end surface of the outlet valve seat 12 that cooperates with the ball 1 is provided with an outlet sealing ring limiting groove, and a sealing ring 10 is embedded in the outlet sealing ring limiting groove. The sealing ring 10 is in sealing cooperation with the spherical surface of the ball 1 .

[0073] like Figure 6 As shown, the outer end of the outlet valve seat mounting ring 11 is provided with a limiting convex ring located inside the outlet sealing gasket 407, which serves to limit the outlet sealing gasket 407 and prevent the outlet sealing gasket 407 from shifting in position.

[0074] like Figure 6As shown, a sealing gasket is provided between the end face of the outlet valve seat mounting ring 11 and the end face of one end of the convex ring portion 412 of the valve body, and the sealing gasket is limited by the sealing gasket limiting ring groove. At the same time, the outlet valve seat mounting ring 11 is provided with a sixth convex ring portion 1105 located inside the convex ring portion 412 of the valve body, and a sealing groove is provided between the outer periphery of the upper end of the sixth convex ring portion 1105 and the convex ring portion 412 of the valve body, and a lip seal ring 21 is provided in the sealing groove, and the sealing end of the lip seal ring 21 is arranged toward the direction of the sphere 1, that is, the left direction in the figure, which effectively plays a role in preventing limitation. A lip seal ring limiting convex ring portion 22 is provided on the outer periphery of the upper end of the sixth convex ring portion 1105, and the lip seal ring limiting convex ring portion 22 forms a limit for the lip seal ring 21. Through the above arrangement, it is possible to effectively prevent the low-temperature medium from leaking from the connection between the valve body pipe 403 and the outlet valve seat mounting ring 11.

[0075] The double-sealed energy storage ring 13 includes a jacket made of modified PTFE wrapped with high-strength alloy wire as the reinforcement, both ends of the jacket are provided with openings, and the openings are provided with T-shaped retaining ring grooves, and the T-shaped retaining ring made of modified PTFE wrapped with high-strength alloy wire as the reinforcement is embedded in the T-shaped retaining ring groove, and the T-shaped retaining ring is separated in the opening to form two limiting cavities, and the four limiting cavities at both ends are provided with energy storage springs made of hairspring alloy or INCONEL alloy, and the outer end of the T-shaped retaining ring is arranged relative to the energy storage spring and the jacket protrusion.

[0076] like Figure 8 As shown in (c), the second positioning ring 14 is provided with a plurality of third disassembly holes 1401 formed by radial openings arranged at equal intervals, such as Figure 8 As shown in (b), the outlet valve seat 12 is provided with a plurality of fourth disassembly holes 1205 formed by radial openings arranged at equal intervals, and the number of the third disassembly holes 1401 is equal to the number of the fourth disassembly holes 1205 and the positions are arranged correspondingly. The spring 7 in the outlet valve seat assembly will cause its elastic performance to decrease after long-term use, so the outlet valve seat assembly needs to be disassembled for replacement, and a long rod-shaped disassembly tool is inserted into the fourth disassembly hole 1205 and the third disassembly hole 1401, and then the disassembly is slowly performed, so that the outlet valve seat 12, the double seal energy storage ring 13, and the first positioning ring 9 are slowly withdrawn from the inlet valve seat mounting ring 5 together to prevent the wear of the double seal energy storage ring 13. Since the preparation cost of the high-performance double seal energy storage ring 13 is extremely high, if the double seal energy storage ring 13 is damaged, the maintenance cost is too high. Therefore, this embodiment can realize the non-destructive disassembly and assembly of the double seal energy storage ring 13, effectively reducing the maintenance cost of downstream users.

[0077] like Figure 2 As shown in (c), the valve body main pipe 403 is provided with an upper connecting hole 411. Fig. 9As shown, a connecting sleeve 15 is provided in the upper connecting hole 411, an extended valve cover 16 is connected to the upper end of the connecting sleeve 15, a connecting flange is provided on the outer periphery of the connecting sleeve 15, a lower connecting flange is provided on the outer periphery of the lower end of the extended valve cover 16, and the lower connecting flange on the outer periphery of the extended valve cover 16 and the connecting flange on the outer periphery of the connecting sleeve 15 are sequentially connected and overlapped with the valve body main pipe fitting 403 and are connected and fastened by detachable fasteners;

[0078] An upper connecting flange is provided on the outer periphery of the upper end of the extended valve cover 16, and a driving mechanism 3 is connected to the upper end of the extended valve cover 16. The output end of the driving mechanism 3 is connected to the driving valve stem 2, and the driving valve stem 2 passes through the extended valve cover 16 and the connecting sleeve 15 in sequence to connect to the ball 1.

[0079] A T-shaped sealing cavity is provided between the valve body main pipe fitting 403 and the connecting sleeve 15, a matching T-shaped guide sleeve 23 is provided in the T-shaped sealing cavity, a sealing gasket is provided between the upper end of the T-shaped guide sleeve 23 and the connecting sleeve 15, and a lip sealing ring 21 is provided between the lower end of the T-shaped guide sleeve 23 and the valve body main pipe fitting 403, and the sealing end of the lip sealing ring 21 is arranged toward the direction of the sphere, that is, the downward direction in the figure, so that the low-temperature medium can be effectively prevented from leaking from between the valve body main pipe fitting 403 and the connecting sleeve 15.

[0080] A shaft sleeve 20 is sleeved on the outer periphery of the lower end of the connecting sleeve 15 , and the ball 1 is sleeved outside the shaft sleeve 20 .

[0081] like Fig.10 As shown, a lower connecting hole is provided on the main body pipe 403 of the valve body, and a supporting valve stem 18 and a bottom cover 19 are provided in the lower connecting hole. The bottom cover 19 is fastened to the main body pipe 403 of the valve body by bolts. The supporting valve stem 18 is arranged on the bottom cover 19 and supported by the bottom cover 19. A shaft sleeve 20 is provided on the outer sleeve of the supporting valve stem 18, and the ball 1 is sleeved outside the shaft sleeve 20. A sealing groove is provided between the outer periphery of the upper end of the bottom cover 19 and the main body pipe 403 of the valve body, and a lip seal ring 21 is provided in the sealing groove. The sealing end of the lip seal ring 21 is arranged toward the direction of the supporting valve stem 18, i.e., the upper end in the figure, to effectively prevent position limiting. A lip seal ring limiting convex ring portion 22 is provided on the outer periphery of the upper end of the bottom cover 19, and the lip seal ring limiting convex ring portion 22 forms a position limit for the lip seal ring 21.

[0082] In this embodiment, if Fig.11As shown, all the lip-shaped sealing ring limiting convex ring portions 22 provided in this embodiment, that is, the lip-shaped sealing ring limiting convex ring portions 22 provided on the valve body main pipe fitting 403 and the bottom cover 19, have a guiding smooth inclined surface 2201 on one side for facilitating the insertion of the lip-shaped sealing ring 21 and a limiting smooth convex surface 2202 on the other side for preventing the lip-shaped sealing ring 21 from slipping out. Under the action of a certain external force, the lip-shaped sealing ring 21 can be removed without damage by slowly moving along the limiting smooth convex surface 2202.

[0083] The outer periphery of the extended valve cover 16 is provided with a plurality of arc-shaped heat dissipation grooves 1601 and is connected with a drip plate 17. At present, in the field of ultra-low temperature valve technology, the heat dissipation area is usually increased by lengthening the valve cover, opening annular heat dissipation grooves on the outer periphery of the extended valve cover, or adding heat dissipation plates, wherein the annular heat dissipation grooves opened on the outer periphery of the extended valve cover are generally annular grooves with a rectangular cross section. When a plurality of annular heat dissipation grooves of the above structure are opened on the outer periphery of the extended valve cover, the heat dissipation efficiency can be significantly improved, but the strength of the extended valve cover 16 will also be significantly reduced, because the wall thickness of the extended valve cover 16 with the annular heat dissipation groove is significantly reduced, and it is relatively easy to bend under the action of external force. If the wall thickness of the extended valve cover 16 is increased, the heat dissipation efficiency is affected. The arc-shaped heat dissipation groove 1601 provided in this embodiment has an arc-shaped cross section, that is, its surface is a concave curved surface. Although the wall thickness of the extended valve cover 16 with the annular heat dissipation groove is reduced, the setting of the concave curved surface effectively improves the bending resistance of the extended valve cover 16 and improves the strength of the overall extended valve cover 16. The drip plate 17 is made of a plate material, which is first flattened and connected to the extended bracket by friction welding to ensure its flatness and performance.

[0084] like Fig.12 As shown, the inner circumference of the upper end of the extended valve cover 16 is provided with a first groove, a second groove, and a third groove with decreasing inner diameters from top to bottom. A packing cover 24, a packing assembly 25, a packing gasket 26, and a lip seal ring 21 are provided between the extended valve cover 16 and the driving valve stem 2 from top to bottom. The packing assembly 25 is arranged in the second groove. The packing cover 24 is T-shaped. The packing cover 24 with a larger outer diameter is arranged in the first groove and is threadedly connected and fastened with the inner wall of the first groove. The packing cover 24 with a smaller outer diameter is arranged in the second groove and its end forms a downward extrusion effect on the packing assembly 25. The packing gasket 26 is T-shaped. The packing gasket 26 with a larger outer diameter is arranged in the second groove and forms a support effect on the packing assembly 25. The packing gasket 26 with a smaller outer diameter is arranged in the third groove. The sealing end of the lip seal ring 21 is arranged downward. This effectively prevents leakage of cryogenic medium. The packing assembly 25 includes a plurality of V-shaped middle packing pieces stacked up and down, an upper packing piece with a flat upper surface arranged above the middle packing, and a lower packing piece with a flat lower surface arranged below the middle packing.

[0085] The above disclosure is only the preferred embodiment of the present invention, which certainly cannot be used to limit the scope of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope of the present invention.

Claims

1. Online maintenance of ultra-low temperature high performance ball valve, characterized by: It comprises a valve body assembly, an inlet valve seat assembly, an outlet valve seat assembly, a ball (1), a drive valve stem (2), and a drive mechanism (3); The valve body assembly comprises an inlet end pipe (401), an inlet connecting flange (402), a valve body main pipe fitting (403), an outlet end pipe (404), and an outlet connecting flange (405), wherein the inlet connecting flange (402) and the outlet connecting flange (405) are respectively connected and fastened to two ends of the valve body main pipe fitting (403) via detachable fasteners; One end of the inlet end pipe (401) is located inside the inlet connecting flange (402), and a protrusion is provided on the outer periphery of the portion located inside the inlet connecting flange (402), and a limiting protrusion is provided on the inner periphery of the inlet connecting flange (402), and the protrusion provided on the inlet end pipe (401) is located on a side of the limiting protrusion of the inlet connecting flange (402) close to the valve body main pipe fitting (403); One end of the outlet end pipe (404) is located in the outlet connection flange (405), and a protrusion is provided on the outer periphery of the portion located in the outlet connection flange (405), and a limiting protrusion is provided on the inner periphery of the outlet connection flange (405), and the protrusion provided on the outlet end pipe (404) is located on a side of the limiting protrusion of the outlet connection flange (405) close to the valve body main pipe fitting (403); Both ends of the inner periphery of the valve body main pipe fitting (403) are provided with internal threaded portions (408); the inlet valve seat assembly and the outlet valve seat assembly are respectively fixed to the two ends of the valve body main pipe fitting (403) through threaded connection; the ball (1) is arranged between the inlet valve seat assembly and the outlet valve seat assembly; the driving valve stem (2) passes through the valve body main pipe fitting (403) and extends into the inner cavity to connect with the ball (1) to drive the ball (1) to rotate to realize opening and closing; An inlet sealing gasket (406) is provided between the inlet end pipe (401) and the inlet valve seat assembly. Under the tightening action of the detachable fastener, the inlet sealing gasket (406) is squeezed by the inlet end pipe (401) and the inlet valve seat assembly to form a sealing effect; An outlet sealing gasket (407) is provided between the outlet end pipe (404) and the outlet valve seat assembly. Under the tightening action of the detachable fastener, the outlet sealing gasket (407) is squeezed by the outlet end pipe (404) and the outlet valve seat assembly to form a sealing effect; The minimum spacing between the assembly formed by connecting the inlet end pipe (401) and the inlet connecting flange (402) and the assembly formed by connecting the outlet end pipe (404) and the outlet connecting flange (405) is a, and the maximum width of the assembly formed by connecting the valve body main pipe (403), the inlet valve seat assembly and the outlet valve seat assembly is b, and a≥b; The inlet valve seat assembly comprises an inlet valve seat mounting ring (5), and an inlet valve seat (6) arranged on the inner periphery of the inlet valve seat mounting ring (5); the outer periphery of the inlet valve seat mounting ring (5) is provided with a first external threaded portion (501), and the first external threaded portion (501) is threadably matched with an internal threaded portion (408) at one end of the valve body main pipe fitting (403); The inlet valve seat mounting ring (5) is provided with a first convex ring portion (502) on its inner periphery, the first convex ring portion (502) is provided with a second convex ring portion (503) on its inner periphery, the inlet valve seat (6) comprising a first inlet valve seat portion (601) arranged on a side of the first convex ring portion (502) close to the sphere (1) and a second inlet valve seat portion (602) arranged on a side of the second convex ring portion (503) close to the sphere (1); A plurality of first spring limiting holes (504) arranged in an annular pattern at equal intervals are provided on the end surface of the first convex ring portion (502) close to the spherical body (1); and a plurality of springs (7) are provided between the first convex ring portion (502) and the first inlet valve seat portion (601) and are limited by the first spring limiting holes (504); A first sealed chamber is formed by a certain distance between the outer periphery of the second inlet valve seat portion (602) and the inner periphery of the first convex ring portion (502); a single sealed energy storage ring (8) and a first positioning ring (9) are provided in the first sealed chamber; the sealing end of the single sealed energy storage ring (8) is arranged toward a side away from the sphere (1); the first positioning ring (9) is located on a side of the single sealed energy storage ring (8) away from the sphere (1); and a first limiting convex ring (603) is provided on the outer periphery of the second inlet valve seat portion (602) and is located on a side of the single sealed energy storage ring (8) close to the sphere (1); The end surface of the inlet valve seat (6) that cooperates with the ball (1) is provided with an inlet sealing ring limiting groove (604), a sealing ring (10) is embedded in the inlet sealing ring limiting groove (604), and the sealing ring (10) cooperates with the spherical surface of the ball (1) in a sealing manner; The outlet valve seat assembly comprises an outlet valve seat mounting ring (11), and an outlet valve seat (12) arranged on the inner periphery of the outlet valve seat mounting ring (11); the outer periphery of the outlet valve seat mounting ring (11) is provided with a second external threaded portion (1101), and the second external threaded portion (1101) is threadably matched with an internal threaded portion (408) at one end of the valve body main pipe fitting (403); The outlet valve seat mounting ring (11) is provided with a third convex ring portion (1102) on its inner periphery, the third convex ring portion (1102) is provided with a fourth convex ring portion (1103) on its inner periphery, and the outlet valve seat (12) comprises a first outlet valve seat portion (1201) provided on a side of the third convex ring portion (1102) close to the sphere (1) and a second outlet valve seat portion (1202) provided on a side of the fourth convex ring portion (1103) close to the sphere (1); A plurality of second spring limiting holes (1104) arranged in an annular pattern at equal intervals are provided on the end surface of the third convex ring portion (1102) close to the spherical body (1), and a plurality of springs (7) limited by the second spring limiting holes (1104) are provided between the third convex ring portion (1102) and the first outlet valve seat portion (1201); A certain distance is provided between the outer periphery of the second outlet valve seat portion (1202) and the inner periphery of the third convex ring portion (1102) to form a second sealed chamber, a double-sealed energy storage ring (13) and a second positioning ring (14) are provided in the second sealed chamber, both ends of the double-sealed energy storage ring (13) are sealed ends, the second positioning ring (14) is located on a side of the double-sealed energy storage ring (13) away from the sphere (1), and a second limiting convex ring (1203) is provided on the outer periphery of the second outlet valve seat portion (1202) and located on a side of the double-sealed energy storage ring (13) close to the sphere (1); An outlet sealing ring limiting groove is provided on the end surface of the outlet valve seat (12) that cooperates with the ball (1), a sealing ring (10) is embedded in the outlet sealing ring limiting groove, and the sealing ring (10) cooperates with the spherical surface of the ball (1) in a sealing manner.

2. The online repairable ultra-low temperature high performance ball valve according to claim 1 is characterized in that: The inlet connecting flange (402) and the outlet connecting flange (405) are both provided with an annular embedding groove (409) on their outer circumferences, and the protrusion is formed by embedding four open rings (410) in the annular embedding groove (409).

3. The online repairable ultra-low temperature high performance ball valve according to claim 1 is characterized in that: The single sealed energy storage ring (8) comprises an energy storage spring made of a hairspring alloy or an INCONEL alloy, a jacket made of a high-strength alloy wire as a rib and a modified PTFE wrapped outside, and a T-shaped retaining ring made of a high-strength alloy wire as a rib and a modified PTFE wrapped outside. The jacket is provided with an opening on a side away from the sphere (1), and the energy storage spring is arranged in the opening and is wrapped by the jacket to limit the position of the energy storage spring. The T-shaped retaining ring is arranged on a side of the jacket away from the sphere (1), and one end with a small area supports the energy storage spring.

4. The online repairable ultra-low temperature high performance ball valve according to claim 3 is characterized in that: The first positioning ring (9) is provided with a plurality of first disassembly holes (901) formed by radial openings arranged at equal intervals, and the inlet valve seat (6) is provided with a plurality of second disassembly holes (605) formed by radial openings arranged at equal intervals, wherein the number of the first disassembly holes (901) is equal to the number of the second disassembly holes (605) and the positions are arranged correspondingly.

5. The online repairable ultra-low temperature high performance ball valve according to claim 1 is characterized in that: The double-sealed energy storage ring (13) comprises a jacket made of modified PTFE wrapped with high-strength alloy wire as a reinforcement, the jacket is provided with openings at both ends and T-shaped retaining ring grooves are provided in the openings, a T-shaped retaining ring made of modified PTFE wrapped with high-strength alloy wire as a reinforcement is embedded in the T-shaped retaining ring groove, the T-shaped retaining ring is separated in the opening to form two limiting cavities, and energy storage springs made of hairspring alloy or INCONEL alloy are provided in the four limiting cavities at both ends, and the outer end of the T-shaped retaining ring is arranged relative to the energy storage spring and the jacket protrusion.

6. The online repairable ultra-low temperature high performance ball valve according to claim 5 is characterized in that: The second positioning ring (14) is provided with a plurality of third disassembly holes (1401) formed by radial openings arranged at equal intervals, and the outlet valve seat (12) is provided with a plurality of fourth disassembly holes (1205) formed by radial openings arranged at equal intervals, wherein the number of the third disassembly holes (1401) is equal to the number of the fourth disassembly holes (1205) and the positions are arranged correspondingly.

7. The online repairable ultra-low temperature high performance ball valve according to claim 1 is characterized in that: An upper connecting hole (411) is formed on the main body pipe fitting (403) of the valve body, a connecting sleeve (15) is provided in the upper connecting hole (411), an extended valve cover (16) is connected to the upper end of the connecting sleeve (15), a connecting flange is provided on the outer periphery of the connecting sleeve (15), a lower connecting flange is provided on the outer periphery of the lower end of the extended valve cover (16), the lower connecting flange on the outer periphery of the extended valve cover (16), the connecting flange on the outer periphery of the connecting sleeve (15) and the main body pipe fitting (403) of the valve body are sequentially connected and stacked, and are connected and fastened by detachable fasteners; An upper connecting flange is provided on the outer periphery of the upper end of the extended valve cover (16), and a driving mechanism (3) is connected to the upper end of the extended valve cover (16). The output end of the driving mechanism (3) is connected to the driving valve stem (2), and the driving valve stem (2) passes through the extended valve cover (16) and the connecting sleeve (15) in sequence to connect to the ball (1).

8. The online repairable ultra-low temperature high performance ball valve according to claim 7 is characterized in that: The extended valve cover (16) is provided with a plurality of crescent-shaped heat dissipation grooves (1601) on its outer periphery and is connected to a drip plate (17).

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