Low-temperature fixed ball valve

Abstract

This invention relates to the field of valve technology, and in particular to a cryogenic fixed ball valve. The valve body has a guide assembly on its inner wall, comprising a guide ring and a mounting base. The guide ring is fixed to the inner wall of the valve body via the mounting base. A guide groove is formed on the end face of the valve seat away from the ball core, allowing the guide ring to extend into it. The guide ring and the guide groove are interlocked. A first push block is provided between the first lip seal and the valve body. The end of the first push block extends into the opening of the first lip seal, and a first pressure hole is also provided on the first push block. One end of the first pressure hole communicates with the flow channel, and the other end communicates with the opening of the first lip seal. This invention provides a first push block to prevent the first lip seal from deflecting, and also provides a guide assembly on the inner wall of the valve body to guide the movement direction of the valve seat, reducing radial vibration of the valve seat and further preventing the first lip seal from deflecting due to the movement of the valve seat, thus avoiding leakage.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a cryogenic fixed ball valve. Background Technology

[0002] A ball valve is a valve in which the opening and closing element, namely a ball, is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. This type of valve should generally be installed horizontally in the pipeline. Its main characteristics are compact structure, high reliability, and ease of operation and maintenance.

[0003] The cryogenic fixed ball valve is a new generation of high-performance ball valve, suitable for long-distance pipelines and general industrial pipelines, with good strength and high safety.

[0004] Under low-temperature conditions, ordinary circular sealing rings shrink due to cold and lose their sealing effect. Therefore, existing cryogenic fixed ball valves usually install lip seals at the connection between the valve seat and the valve body to replace the circular sealing rings. The lip seals deform under pressure to achieve better sealing. If an elastic structure is also installed between the valve seat and the valve body, the valve seat can achieve a self-compensating sealing fit with the ball core. However, the lip seals will be deflected due to the movement of the valve seat, that is, the two contact surfaces of the lip seals move in opposite directions, providing opposite forces to the lip seals. The lip seals fail to seal due to deflection, which will cause leakage. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a cryogenic fixed ball valve. This invention is provided with a first push block to prevent the first lip seal ring from deflecting, and a guide component is provided on the inner wall of the valve body to guide the movement direction of the valve seat, thereby reducing the radial vibration of the valve seat and further preventing the first lip seal ring from deflecting due to the movement of the valve seat, thus avoiding leakage.

[0006] The technical solution adopted in this invention is as follows: a cryogenic fixed ball valve, comprising a valve body, a ball core, a valve seat, a valve stem, a valve cover, and a drive mechanism. The valve body has a flow channel. The ball core and valve seat are sealed together within the valve body, separating the flow channel. The valve cover is located on one side of the valve body. One end of the valve stem is connected to the ball core, and the other end passes through the valve cover and connects to the drive mechanism. An elastic component and a first lip seal are provided between the valve seat and the valve body. The elastic component presses the valve seat towards the ball core. A guide component is also provided on the inner wall of the valve body. The guide component includes a guide ring and a mounting seat. The guide ring is fixed to the inner wall of the valve body by the mounting seat. A guide groove is provided on the end face of the valve seat away from the ball core, allowing the guide ring to extend into it. The guide ring and the guide groove are inserted into each other. A first push block is also provided between the first lip seal and the valve body. The end of the first push block extends into the opening of the first lip seal, and a first pressure hole is also provided on the first push block. One end of the first pressure hole communicates with the flow channel, and the other end communicates with the opening of the first lip seal.

[0007] A fixed seat and a stop block are provided between the valve body and the valve seat. One end of the elastic component abuts against the valve seat and the other end abuts against the fixed seat. The fixed seat extends from the end away from the elastic component and has an extension that abuts against the stop block. The first lip seal ring and the first push block are abutted between the stop block and the inner wall of the valve body.

[0008] A sealing cavity is formed between the fixed seat and the valve seat. The valve seat is provided with an annular platform that communicates with the sealing cavity. A second lip seal and a second push block are provided inside the annular platform. The end of the second push block extends into the opening of the second lip seal.

[0009] The fixing seat has an inclined surface on the side wall corresponding to the sealing cavity. The inclined surface extends to the side wall of the extension and is inclined towards the extension.

[0010] The valve seat is also provided with a flow passage that communicates with the flow channel. The flow passage is connected to the sealing cavity through a first channel. A pressure component is also provided in the flow passage. The pressure component is used to connect or block the flow passage. A converging end is provided at one end of the flow passage near the flow channel. The pressure component includes a first elastic element and a pressure ball. The first elastic element squeezes the pressure ball toward the converging end.

[0011] The second push block has a second pressure hole, one end of which is connected to the sealing cavity and the other end is connected to the opening of the second lip seal ring.

[0012] The second pusher has a branch hole on the side near the ring platform. The branch hole is connected to the second pressure hole and the branch hole and the second pressure hole are distributed relatively perpendicularly. The flow hole is connected to the branch hole through the second channel. The second channel is farther away from the convergence end than the first channel. The pressure ball has a first state of blocking the flow hole, a second state of connecting the flow hole to the first channel, and a third state of connecting the flow hole to both the first channel and the second channel.

[0013] The inner diameter of the branch hole is larger than the inner diameter of the second pressure hole, the inner diameter of the second channel corresponds to the branch hole, and the inner diameter of the second channel is larger than the inner diameter of the first channel.

[0014] The valve seat is also threadedly connected to a pressure sleeve. The pressure sleeve has a second elastic element and a top ball on one side that abuts against the inner wall of the valve body. The second elastic element presses the top ball against the inner wall of the valve body. The elastic component includes a disc spring, one end of which abuts against a fixed seat and the other end of which abuts against the pressure sleeve.

[0015] A pressure sleeve and a fixed seat are provided between the valve seat and the valve body. The elastic component includes a disc spring. One end of the disc spring abuts against the fixed seat and the other end abuts against the pressure sleeve. The pressure sleeve is threadedly connected to the valve seat. A sealing cavity is formed between the valve seat and the fixed seat. A bellows is provided in the sealing cavity. One end of the bellows abuts against the fixed seat and the other end abuts against the valve seat.

[0016] The beneficial effects of this invention are as follows: This invention provides a first push block to prevent the first lip seal from deflecting. Specifically, the end of the first push block extends into the opening of the first lip seal. The first push block can both press the first lip seal to both sides and limit its movement when the valve seat moves, preventing deflection. A first pressure hole is also provided on the first push block. The medium pressure in the flow channel enters the opening of the first lip seal along the first pressure hole, further pushing the first lip seal to expand to both sides. Furthermore, a guide assembly is provided on the inner wall of the valve body to guide the movement direction of the valve seat. The valve seat is engaged with a guide ring via a guide groove, reducing radial vibration of the valve seat and further preventing the first lip seal from deflecting due to the movement of the valve seat, thus avoiding leakage. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0018] Figure 1 This is a schematic diagram of the structure of the cryogenic fixed ball valve of the present invention;

[0019] Figure 2 This is a cross-sectional schematic diagram of the present invention;

[0020] Figure 3 for Figure 2 A magnified view of a portion of point A in the middle;

[0021] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle;

[0022] Figure 5 This is a cross-sectional schematic diagram of another embodiment of the present invention;

[0023] Figure 6 for Figure 5 A magnified view of a portion of point C in the middle;

[0024] In the figure, 1-valve body, 2-ball core, 3-valve seat, 4-valve stem, 5-valve cover, 6-drive mechanism, 7-flow channel, 8-first lip seal ring, 9-guide ring, 10-mounting seat, 11-guide groove, 12-first push block, 13-first pressure hole, 14-fixed seat, 15-stop block, 16-extension, 17-sealing cavity, 18-ring platform, 19-second lip seal ring, 20-second push block, 21-sloping surface, 22-flow hole, 23-first channel, 24-contraction end, 25-first elastic element, 26-pressure ball, 27-second pressure hole, 28-branch hole, 29-second channel, 30-pressure sleeve, 31-second elastic element, 32-top ball, 33-disc spring, 34-bellows. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0026] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0027] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0028] like Figures 1 to 4As shown, in one embodiment of the present invention, a cryogenic fixed ball valve includes a valve body 1, a ball core 2, a valve seat 3, a valve stem 4, a valve cover 5, and a drive mechanism 6. The valve body 1 has a flow channel 7. The ball core 2 and the valve seat 3 are sealed together within the valve body 1, separating the flow channel 7. The valve cover 5 is located on one side of the valve body 1. One end of the valve stem 4 is connected to the ball core 2, and the other end passes through the valve cover 5 and is connected to the drive mechanism 6. An elastic component and a first lip seal 8 are provided between the valve seat 3 and the valve body 1. The elastic component presses the valve seat 3 towards the ball core 2. A guide component is also provided on the inner wall of the valve body 1. The assembly includes a guide ring 9 and a mounting base 10. The guide ring 9 is fixed to the inner wall of the valve body 1 by the mounting base 10. The valve seat 3 has a guide groove 11 on its end face away from the ball core 2 for the guide ring 9 to extend into. The guide ring 9 is inserted into the guide groove 11. A first push block 12 is also provided between the first lip seal ring 8 and the valve body 1. The end of the first push block 12 extends into the opening of the first lip seal ring 8, and a first pressure hole 13 is also provided on the first push block 12. One end of the first pressure hole 13 is connected to the flow channel 7 and the other end is connected to the opening of the first lip seal ring 8.

[0029] The beneficial effects of this design are as follows: The invention provides a first push block to prevent the first lip seal from deflecting. That is, the end of the first push block extends into the opening of the first lip seal. The first push block can both squeeze the first lip seal to both sides and limit the first lip seal when the valve seat moves, preventing deflection. A first pressure hole is also provided on the first push block. The medium pressure of the flow channel enters the opening of the first lip seal along the first pressure hole. The medium pressure further pushes the first lip seal to expand to both sides. A guide component is also provided on the inner wall of the valve body to guide the movement direction of the valve seat. The valve seat is engaged with the guide ring through the guide groove, reducing the radial vibration of the valve seat and further preventing the first lip seal from deflecting due to the movement of the valve seat, thus avoiding leakage.

[0030] Furthermore, a fixed seat 14 and a stop block 15 are provided between the valve body 1 and the valve seat 3. One end of the elastic component abuts against the valve seat 3 and the other end abuts against the fixed seat 14. The fixed seat 14 extends from the end away from the elastic component and has an extension portion 16 that abuts against the stop block 15. The first lip seal ring 8 and the first push block 12 are abutted between the stop block 15 and the inner wall of the valve body 1.

[0031] The beneficial effects of this design are as follows: the first lip seal and the first push block are axially limited by the abutment block, and the abutment block is further limited by the extension of the fixed seat, forming a good sealing structure.

[0032] Further, a sealing cavity 17 is formed between the fixed seat 14 and the valve seat 3. The valve seat 3 is provided with an annular platform 18 that communicates with the sealing cavity 17. The annular platform 18 is provided with a second lip seal ring 19 and a second push block 20. The end of the second push block 20 extends into the opening of the second lip seal ring 19.

[0033] The beneficial effects of this design are as follows: the second lip seal forms a secondary seal, resulting in a better sealing effect. The second lip seal is also equipped with a second push block, which compresses and limits the second lip seal. The second lip seal can also expand to both sides to prevent it from tilting and ensure its normal operation. Furthermore, the second lip seal and the second push block are installed within the ring platform. When the valve seat moves, the side wall of the ring platform applies an axial force to the second push block, which can drive the second lip seal and the second push block to move synchronously.

[0034] Furthermore, the fixing seat 14 has an inclined surface 21 on the side wall corresponding to the sealing cavity 17. The inclined surface 21 extends to the side wall of the extension 16 and is inclined toward the extension 16.

[0035] The beneficial effects of this design are as follows: the inclined surface makes the sealing cavity conical, with a larger inner diameter on the side of the sealing cavity away from the ring platform and a narrower diameter on the side closer to the ring platform, reducing the gap between the fixed seat and the valve seat. The second lip seal can fit more tightly with the valve seat and the fixed seat, further improving the sealing performance. When removing parts, the valve seat is moved away from the ball core, and the second lip seal will not be stuck and cannot be removed, which facilitates disassembly and assembly.

[0036] Furthermore, the valve seat 3 is provided with a flow hole 22 that communicates with the flow channel 7. The flow hole 22 is connected to the sealing cavity 17 through the first channel 23. A pressure component is also provided in the flow hole 22. The pressure component is used to connect or block the flow hole 22. A converging end 24 is provided at one end of the flow hole 22 near the flow channel 7. The pressure component includes a first elastic element 25 and a pressure ball 26. The first elastic element 25 squeezes the pressure ball 26 toward the converging end 24.

[0037] The beneficial effects of this design are as follows: the flow-through orifice allows the medium to flow into the sealing cavity, enabling the medium pressure to act on the second push block, which then presses against the second lip seal ring, improving the sealing performance of the second lip seal ring. When the medium pressure increases, the pressure ball is pushed away from the converging end, and the first elastic element is compressed, connecting the flow-through orifice with the first channel, allowing the medium to enter the sealing cavity. When the medium pressure decreases, the pressure ball returns to its original position and presses tightly against the converging end, blocking the flow-through orifice. The first elastic element uses a spring from the prior art.

[0038] Furthermore, the second push block 20 is provided with a second pressure hole 27, one end of which is connected to the sealing cavity 17 and the other end is connected to the opening of the second lip seal ring 19.

[0039] The beneficial effects of this design are as follows: the second pressure hole on the second push block allows the medium pressure to enter the opening of the second lip seal, further aiding in the expansion of the second lip seal.

[0040] Further, the second pusher 20 has a branch hole 28 on the side near the ring platform 18. The branch hole 28 is connected to the second pressure hole 27, and the branch hole 28 and the second pressure hole 27 are distributed relatively perpendicularly. The flow hole 22 is connected to the branch hole 28 through the second channel 29. The second channel 29 is farther away from the convergence end 24 than the first channel 23. The pressure ball 26 has a first state of blocking the flow hole 22, a second state of connecting the flow hole 22 with the first channel 23, and a third state of connecting the flow hole 22 with both the first channel 23 and the second channel 29.

[0041] The beneficial effects of this design are as follows: the second pressure hole adopts a straight internal structure to reduce the loss of medium flow velocity and facilitates the impact of medium pressure; the branch hole adopts an angled internal structure to allow medium flow; the branch hole is connected to the flow hole through the second channel; under the action of medium pressure, the pressure ball can connect the first channel and the second channel in segments; when the medium pressure is low, the medium can only flow through the first channel; when the medium pressure increases further, the medium can flow through the first channel and the second channel simultaneously, improving the medium pressure flow efficiency; when the medium pressure increases instantaneously, the medium can reach the opening of the second lip seal more quickly, achieving rapid sealing.

[0042] Further, the inner diameter of the branch hole 28 is larger than the inner diameter of the second pressure hole 27, the inner diameter of the second channel 29 corresponds to the branch hole 28, and the inner diameter of the second channel 29 is larger than the inner diameter of the first channel 23.

[0043] The beneficial effects of this design are as follows: the inner diameter of the branch hole and the second channel is larger, providing more space for media flow and allowing the media to flow into the second lip seal more quickly.

[0044] Furthermore, the valve seat 3 is also threadedly connected to a pressure sleeve 30. The pressure sleeve 30 has a second elastic element 31 and a top ball 32 on one side abutting against the inner wall of the valve body 1. The second elastic element 31 presses the top ball 32 against the inner wall of the valve body 1. The elastic component includes a disc spring 33, one end of which abuts against the fixed seat 14 and the other end of which abuts against the pressure sleeve 30.

[0045] The beneficial effects of this design are as follows: the elastic properties of the disc spring are used to press the valve seat against the ball core, improving the sealing performance between the valve seat and the ball core and achieving a self-compensating elastic sealing structure. A second elastic element and a top ball are also provided on the pressure sleeve that is threaded to the valve seat. The second elastic element presses the top ball against the inner wall of the valve body, radially limiting the valve seat, ensuring the coaxiality of the valve seat and the ball core, and ensuring a good sealing fit. The second elastic element also uses a spring of existing technology.

[0046] like Figures 5 to 6 As shown in another embodiment of the present invention, a pressure sleeve 30 and a fixed seat 14 are further provided between the valve seat 3 and the valve body 1. The elastic component includes a disc spring 33, one end of which abuts against the fixed seat 14 and the other end of which abuts against the pressure sleeve 30. The pressure sleeve 30 is threadedly connected to the valve seat 3. A sealing cavity 17 is formed between the valve seat 3 and the fixed seat 14. A bellows 34 is provided in the sealing cavity 17, one end of which abuts against the fixed seat 14 and the other end of which abuts against the valve seat 3.

[0047] The beneficial effects of this design are as follows: the valve seat also forms a self-compensating elastic sealing structure through the disc spring; a bellows is installed in the sealing cavity between the pressure sleeve and the fixed seat; the bellows has axial expansion and contraction characteristics, which can provide a good sealing effect, prevent the valve seat from deflecting due to movement, and is also suitable for low temperature conditions.

[0048] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A cryogenic fixed ball valve, comprising a valve body (1), a ball core (2), a valve seat (3), a valve stem (4), a valve cover (5), and a drive mechanism (6), wherein the valve body (1) is provided with a flow channel (7), the ball core (2) and the valve seat (3) are sealed together and disposed in the valve body (1) to separate the flow channel (7), the valve cover (5) is disposed on one side of the valve body (1), one end of the valve stem (4) is connected to the ball core (2) and the other end passes through the valve cover (5) and is connected to the drive mechanism (6), an elastic component and a first lip seal ring (8) are provided between the valve seat (3) and the valve body (1), the elastic component presses the valve seat (3) toward the ball core (2), characterized in that: The inner wall of the valve body (1) is also provided with a guide assembly, which includes a guide ring (9) and a mounting seat (10). The guide ring (9) is fixed on the inner wall of the valve body (1) by the mounting seat (10). The valve seat (3) has a guide groove (11) on one end face away from the ball core (2) for the guide ring (9) to extend into. The guide ring (9) and the guide groove (11) are inserted into each other. A first push block (12) is also provided between the first lip seal ring (8) and the valve body (1). The end of the first push block (12) extends into the opening of the first lip seal ring (8). A first pressure hole (13) is also provided on the first push block (12). One end of the first pressure hole (13) is connected to the flow channel (7) and the other end is connected to the opening of the first lip seal ring (8). A fixed seat (14) and a stop block (15) are provided between the valve body (1) and the valve seat (3). A sealing cavity (17) is formed between the fixed seat (14) and the valve seat (3). An annular platform (18) communicating with the sealing cavity (17) is provided on the valve seat (3). A second lip seal ring (19) and a second push block (20) are provided inside the annular platform (18). The end of the second push block (20) extends into the opening of the second lip seal ring (19). A flow hole (22) communicating with the flow channel (7) is also provided on the valve seat (3). The flow hole (22) is communicating with the sealing cavity (17) through a first channel (23). A pressure component is also provided inside the flow hole (22). The pressure component is used to connect or block the flow hole (22). The pressure component includes a first elastic element (25) and a pressure ball (26). The second push block (20) is... A second pressure hole (27) is provided, one end of which is connected to the sealing cavity (17) and the other end is connected to the opening of the second lip seal (19). A branch hole (28) is provided on the side of the second push block (20) near the ring platform (18). The branch hole (28) is connected to the second pressure hole (27) and the branch hole (28) and the second pressure hole (27) are distributed relatively perpendicularly. The flow hole (22) is connected to the branch hole (28) through the second channel (29). The second channel (29) is farther away from the converging end (24) than the first channel (23). The pressure ball (26) has a first state of blocking the flow hole (22), a second state of connecting the flow hole (22) with the first channel (23), and a third state of connecting the flow hole (22) with both the first channel (23) and the second channel (29).

2. The cryogenic fixed ball valve according to claim 1, characterized in that: One end of the elastic component abuts against the valve seat (3) and the other end abuts against the fixed seat (14). The fixed seat (14) extends away from the elastic component and has an extension (16) that abuts against the abutment block (15). The first lip seal ring (8) and the first push block (12) are abutted between the abutment block (15) and the inner wall of the valve body (1).

3. The cryogenic fixed ball valve according to claim 2, characterized in that: The fixed seat (14) has a slope (21) on the side wall corresponding to the sealing cavity (17). The slope (21) extends to the side wall of the extension (16) and is inclined towards the extension (16).

4. The cryogenic fixed ball valve according to claim 3, characterized in that: The flow passage (22) has a converging end (24) at one end near the flow channel (7), and the first elastic element (25) squeezes the pressure ball (26) toward the converging end (24).

5. The cryogenic fixed ball valve according to claim 1, characterized in that: The inner diameter of the branch hole (28) is greater than the inner diameter of the second pressure hole (27), the inner diameter of the second channel (29) corresponds to the branch hole (28), and the inner diameter of the second channel (29) is greater than the inner diameter of the first channel (23).

6. The cryogenic fixed ball valve according to claim 1, characterized in that: The valve seat (3) is also threadedly connected to a pressure sleeve (30). The pressure sleeve (30) is provided with a second elastic element (31) and a top ball (32) on one side of the inner wall of the valve body (1). The second elastic element (31) presses the top ball (32) toward the inner wall of the valve body (1). The elastic component includes a disc spring (33). One end of the disc spring (33) abuts against the fixed seat (14) and the other end abuts against the pressure sleeve (30).

7. The cryogenic fixed ball valve according to claim 1, characterized in that: A pressure sleeve (30) and a fixed seat (14) are provided between the valve seat (3) and the valve body (1). The elastic component includes a disc spring (33). One end of the disc spring (33) abuts against the fixed seat (14) and the other end abuts against the pressure sleeve (30). The pressure sleeve (30) is threadedly connected to the valve seat (3). A sealing cavity (17) is formed between the valve seat (3) and the fixed seat (14). A bellows (34) is provided in the sealing cavity (17). One end of the bellows (34) abuts against the fixed seat (14) and the other end abuts against the valve seat (3).

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