Pre-tightening sealing type disc spring high-temperature fixed ball valve for live load pressing plate padding and using method of pre-tightening sealing type disc spring high-temperature fixed ball valve

Abstract

The invention relates to a pre-tightening sealed disc spring high-temperature fixed ball valve with live load pressing plate padding and a using method of the pre-tightening sealed disc spring high-temperature fixed ball valve. The pre-tightening sealed disc spring high-temperature fixed ball valve comprises a valve body, a valve element is rotationally arranged in the valve body, a valve channel is fixedly connected to the valve body, and a valve rod fixed to the valve element is arranged in the axial direction of the valve channel; an inner channel communicated with the inner side of the valve body is formed in the valve channel, a filler pressing plate is connected into the inner channel in a sealed mode, and when a high-temperature medium passes through the valve element, the filler pressing plate is pressed, and a lifting assembly arranged on the filler pressing plate moves upwards in the axis direction of the valve channel; one end of the sealing ring is arranged in the inner channel, the other end of the sealing ring extends out of the inner channel, a part of the sealing ring is reserved, sealing thickness reduction caused by thermal expansion can be actively made up at high temperature, the sealing ring is effectively prevented from being in a plastic deformation environment for a long time, and the sealing performance is improved. Therefore, the sealing effect of the sealing ring is improved.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, specifically to a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing and its usage method. Background Technology

[0002] A ball valve is a type of valve that controls the flow of fluid by rotating a ball with a circular passage. It mainly consists of a valve body, valve seat, ball, valve stem, and a drive mechanism (such as a handle, electric, or pneumatic actuator). Ball valves are divided into floating ball valves and fixed ball valves. In a floating ball valve, the ball is pressed against the valve seat seal by the medium pressure, and the valve stem is floatingly connected to the ball; this type is suitable for small to medium diameters. In a fixed ball valve, the ball is fixed by upper and lower shafts, and the medium pressure is shared between the valve seat and the valve body. Double or triple seat designs enhance sealing under high pressure, and the valve can be used for diameters up to 1.2 meters.

[0003] Existing fixed ball valves widely employ a live-loaded packing seal structure. Tightening the gland bolts generates a radial force on the gland's inclined surface, causing the packing to adhere tightly to the outer surface of the valve stem, achieving a seal. To ensure a good seal, a sufficiently thick sealing ring is typically used in conjunction with the live-loaded packing. However, in high-temperature environments, increased air pressure within the valve passage can compress the live-loaded packing, causing it to thin. This reduces the effective sealing thickness, decreasing the contact area between the live-loaded packing and the valve stem and wall, thus reducing the sealing effect and potentially leading to leakage of the medium from the valve body. Summary of the Invention

[0004] The purpose of this invention is to provide a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing includes a valve body, a valve core rotatably disposed inside the valve body, a valve passage fixedly connected to the valve body, and a valve stem fixed to the valve core along the axial direction of the valve passage. An inner channel communicating with the inside of the valve body is formed in the valve passage. A packing plate is sealed and connected in the inner channel. When a high-temperature medium passes through the valve core, the packing plate is compressed and the lifting assembly set on the packing plate moves up along the axial direction of the valve passage. It also includes a sealing ring, one end of which is disposed inside the inner channel and the other end extends outside the inner channel. When the lifting assembly rises, the elastic extrusion member installed in the valve channel can press down on the sealing ring, so that the sealing ring that was reserved outside the inner channel is pressed into the inner channel.

[0006] As described above, the pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing has a first limiting ring fixedly installed on the inner wall of the inner channel, which can limit the packing pressure plate.

[0007] As described above, the pre-tightened sealing disc spring high-temperature fixed ball valve with live load packing includes a lifting assembly comprising a connecting plate fixedly installed on the upper end of the packing plate. The connecting plate is coaxially arranged with the valve stem, and the valve stem can pass through the connecting plate. A lifting cylinder is provided on the connecting plate. The lifting cylinder has multiple U-shaped grooves distributed along its circumference. The lifting cylinder can pass through the sealing ring and is slidably connected to the sealing ring.

[0008] The pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing as described above: a spring is provided in the inner channel, one end of the spring abuts against the sealing ring, and the other end abuts against the connecting disc.

[0009] The pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing as described above: a pusher that can drive the elastic extrusion member to press down is fixedly installed on the lifting cylinder.

[0010] The live load pressure plate packing pre-tightened sealing disc spring high temperature fixed ball valve as described above: the pushing member includes a transmission sleeve, the transmission sleeve is arranged along the axis of the lifting cylinder, and one end of the transmission sleeve is detachably connected to the lifting cylinder, and a ball is formed on the other end.

[0011] The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing as described above: the elastic extrusion component includes a valve cover, which is slidably connected to the inner wall of the valve passage, and a sleeve is provided along the axial direction of the valve passage. The sleeve is slidably sleeved on one end of the transmission sleeve, and the inner cavity of the sleeve forms an internal thread groove that slides with the ball. It also includes a disc spring, which is disposed between the valve cover and the sealing ring, with one end of the disc spring abutting against the valve cover and the other end abutting against the sealing ring.

[0012] The pre-tightened sealing disc spring fixed ball valve with live load packing as described above: a second limiting ring is fixedly provided on the inner wall of the valve passage, and the second limiting ring is used to limit the valve cover.

[0013] A method for using a pre-tightened sealing disc spring high-temperature fixed ball valve with live-load pressure plate packing, employing the pre-tightened sealing disc spring high-temperature fixed ball valve as described in any of the above-mentioned embodiments, includes the following steps: Step 1: When a high-temperature medium passes through the valve core, the internal air pressure of the valve body increases. Due to the sealing structure between the valve core and the valve body, the pressure of the medium will be transmitted to the packing plate inside the valve body. At this time, the gas squeezes the packing plate, reducing its thickness. Step 2: When the packing plate is subjected to upward pressure, the lifting assembly moves upward along the axis of the valve passage, and under the drive of the pusher, the elastic extrusion member can extrude the sealing ring, so that the sealing ring reserved outside the inner channel is pressed into the inner channel, so that the effective sealing thickness inside the valve passage is maintained within a stable range. Step 3: After the valve body cools down, the packing pressure plate resets, allowing the sealing ring that was pressed into the inner channel to extend out again, avoiding plastic deformation caused by long-term compression.

[0014] Compared with the prior art, the beneficial effects of the present invention are: When a high-temperature medium passes through the valve core, the pressure of the medium is transmitted to the packing plate inside the valve body. At this time, the gas squeezes the packing plate, causing it to be compressed. After the packing plate becomes thinner, its effective sealing thickness in the valve passage decreases. When the packing plate is squeezed, the lifting assembly moves along the axial direction of the valve passage, thereby driving the elastic extrusion member to squeeze the sealing ring. This causes the sealing ring, which was reserved outside the inner channel, to be squeezed into the inner channel by the elastic extrusion member. By reserving a portion of the sealing ring, the reduction in sealing thickness caused by thermal expansion can be actively compensated at high temperatures, and the sealing ring can be effectively prevented from being in a plastic deformation environment for a long time, thereby improving the sealing effect of the sealing ring. Attached Figure Description

[0015] Figure 1 A schematic diagram of a pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing.

[0016] Figure 2 This is a schematic diagram of the valve body and valve core in a pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing.

[0017] Figure 3 This is a schematic diagram of the valve core and valve stem in a pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing.

[0018] Figure 4 This is a schematic diagram of the structure of the first and second limiting rings in a pre-tightened sealing disc spring fixed ball valve with live load pressure plate packing.

[0019] Figure 5 This is a schematic diagram of the packing pressure plate and lifting assembly in a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing.

[0020] Figure 6 This is a schematic diagram of the lifting assembly and sealing ring in a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing.

[0021] Figure 7 This is a schematic diagram of the valve cover and pusher in a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing.

[0022] In the diagram: 1. Valve body; 2. Valve passage; 201. Inner passage; 3. Valve core; 4. First limiting ring; 5. Second limiting ring; 6. Valve stem; 7. Packing plate; 8. Connecting disc; 9. Lifting cylinder; 901. Groove; 10. Sealing ring; 11. Valve cover; 12. Spring; 13. Disc spring; 14. Transmission sleeve; 1401. Ball bearing; 15. Sleeve; 1501. Internal thread groove. Detailed Implementation

[0023] Various exemplary embodiments, features, and aspects of this application will now be described in detail with reference to the accompanying drawings. The same reference numerals in the drawings denote elements that have the same or similar functions. Although various aspects of the embodiments are shown in the drawings, they are not necessarily drawn to scale unless specifically indicated otherwise.

[0024] The term “exemplary” as used herein means “serving as an example, embodiment, or illustration.” Any embodiment illustrated herein as “exemplary” is not necessarily to be construed as superior to or better than other embodiments.

[0025] Furthermore, to better illustrate this application, numerous specific details are provided in the following detailed embodiments. Those skilled in the art should understand that this application can be implemented even without certain specific details. In some instances, methods, means, and elements well-known to those skilled in the art have not been described in detail in order to highlight the main points of this application.

[0026] Please see Figures 1-7 In this embodiment of the invention, a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing includes a valve body 1, a valve core 3 rotatably disposed inside the valve body 1, a valve passage 2 fixedly connected to the valve body 1, and a valve stem 6 fixed to the valve core 3 along the axial direction of the valve passage 2. An inner channel 201 communicating with the inner side of the valve body 1 is formed in the valve channel 2. A packing plate 7 is sealed and connected in the inner channel 201. When a high-temperature medium passes through the valve core 3, the packing plate 7 is pressed and the lifting assembly set on the packing plate 7 moves along the axial direction of the valve channel 2. It also includes a sealing ring 10, one end of which is disposed in the inner channel 201 and the other end extends out of the inner channel 201. When the lifting assembly rises, the elastic extrusion member installed in the valve channel 2 can press down on the sealing ring 10, so that the sealing ring 10 reserved outside the inner channel 201 is pressed into the inner channel 201.

[0027] In this embodiment, when a high-temperature medium passes through the valve core 3, the pressure of the medium is transmitted to the packing plate 7 inside the valve body 1. At this time, the gas squeezes the packing plate 7, causing it to be compressed. After the packing plate 7 becomes thinner, its effective sealing thickness in the valve passage 2 decreases. When the packing plate 7 is squeezed, the lifting assembly moves along the axial direction of the valve passage 2, thereby driving the elastic extrusion member to squeeze the sealing ring 10. This causes the sealing ring 10, which is reserved outside the inner channel 201, to be squeezed into the inner channel 201 by the elastic extrusion member, effectively increasing the sealing thickness in the inner channel 201. This compensates for the reduction in sealing performance caused by the compression of the packing plate 7, allowing the valve body 1 to maintain a stable sealing effect under high-temperature conditions, effectively preventing medium leakage or reduction in sealing effect.

[0028] It should be noted that when the sealing ring 10 is fully inserted into the inner channel 201, under long-term compression of the pipeline, the initial preload of the sealing ring 10 gradually decreases due to plastic deformation. In this embodiment, by reserving a portion of the sealing ring 10, the reduction in sealing thickness caused by thermal expansion can be actively compensated for at high temperatures, and the sealing ring 10 is effectively prevented from being in a plastic deformation environment for a long time, thereby improving the sealing effect of the sealing ring 10. Preferably, a first limiting ring 4 is fixedly provided on the inner wall of the inner channel 201, and the first limiting ring 4 can limit the packing pressure plate 7.

[0029] As a further embodiment of the present invention, please refer to... Figure 5 and Figure 6 The lifting assembly includes a connecting plate 8 fixedly installed on the upper end of the packing pressure plate 7. The connecting plate 8 is coaxially arranged with the valve stem 6 and the valve stem 6 can pass through the connecting plate 8. A lifting cylinder 9 is provided on the connecting plate 8. The lifting cylinder 9 has a plurality of U-shaped grooves 901 distributed along the circumference. The lifting cylinder 9 can pass through the sealing ring 10 and is slidably connected with the sealing ring 10.

[0030] A spring 12 is provided inside the inner channel 201. One end of the spring 12 abuts against the sealing ring 10, and the other end abuts against the connecting plate 8.

[0031] In this embodiment, when the packing plate 7 is squeezed, the packing plate 7 generates upward pressure on the connecting plate 8. At this time, the connecting plate 8 and the lifting cylinder 9 move upward along the axis of the valve channel 2. When the lifting cylinder 9 moves upward, the setting of the groove 901 ensures that the sealing ring 10 does not interfere with the lifting cylinder 9. The rise of the lifting cylinder 9 generates a driving force on the pushing member, thereby driving the elastic extrusion member to extrude the sealing ring 10, ensuring that under high temperature conditions, the sealing ring 10 can be quickly and automatically inserted into the inner channel 201 for sealing.

[0032] As a further embodiment of the present invention, please refer to... Figure 7The lifting cylinder 9 is fixedly equipped with a pusher that can drive the elastic extrusion member to press down.

[0033] The pushing component includes a transmission sleeve 14, which is arranged along the axis of the lifting cylinder 9. One end of the transmission sleeve 14 is detachably connected to the lifting cylinder 9, and a ball bearing 1401 is formed on the other end.

[0034] The elastic extrusion member includes a valve cover 11, which is slidably connected to the inner wall of the valve passage 2. A sleeve 15 is provided along the axial direction of the valve passage 2. The sleeve 15 is slidably sleeved on one end of the transmission sleeve 14, and the inner cavity of the sleeve 15 forms an internal thread groove 1501 that slides with the ball 1401. It also includes a disc spring 13, which is disposed between the valve cover 11 and the sealing ring 10. One end of the disc spring 13 abuts against the valve cover 11 and the other end abuts against the sealing ring 10.

[0035] Preferably, at least one set of strip grooves is formed on the inner wall of the valve passage 2, and a strip block is provided on the valve cover 11 to slide with the strip groove. Under the restriction and cooperation of the strip groove and the strip block, the valve cover 11 is slidably connected to the inner wall of the valve passage 2, and the valve cover 11 can move linearly along the axial direction of the valve passage 2 without affecting the rotation of the transmission sleeve 14.

[0036] In one embodiment, the lifting cylinder 9 and the transmission sleeve 14 are fixed together by bolts.

[0037] In this embodiment, when the lifting cylinder 9 rises, it drives the transmission sleeve 14 to rise synchronously. With the cooperation of the ball 1401 and the internal thread groove 1501, when the ball 1401 rotates, it generates an inclined force on the internal thread groove 1501. Under the restriction of the strip groove and the strip block, the valve cover 11 can move down along the axis of the valve channel 2. When the valve cover 11 moves down, it drives the disc spring 13 to move down synchronously. Under the compression of the disc spring 13, the sealing ring 10 reserved outside the inner channel 201 is pressed into the inner channel 201, so that the reduced sealing thickness in the inner channel 201 can be effectively compensated, maintaining the good sealing performance of the valve body 1 under high temperature conditions. When the temperature drops, the packing pressure plate 7 resets and can drive the sealing ring 10 to automatically reset, thereby effectively avoiding the sealing ring 10 being in a plastic deformation environment for a long time, and further improving the sealing effect of the sealing ring 10.

[0038] Preferably, a second limiting ring 5 is fixedly provided on the inner wall of the valve passage 2. The second limiting ring 5 is used to limit the valve cover 11 to prevent the valve cover 11 from moving upward under the pressure of the disc spring 13 and losing the pressure on the sealing ring 10.

[0039] A method for using a pre-tightened sealing disc spring high-temperature fixed ball valve with live-load pressure plate packing, employing the pre-tightened sealing disc spring high-temperature fixed ball valve as described in any of the above-mentioned embodiments, includes the following steps: Step 1: When a high-temperature medium passes through the valve core 3, typically between 150° and 360°, the internal air pressure of the valve body 1 increases. Due to the sealing structure between the valve core 3 and the valve body 1, the pressure of the medium is transmitted to the packing plate 7 inside the valve body 1. At this time, the gas compresses the packing plate 7, reducing its thickness. Step 2: When the packing plate 7 is subjected to upward pressure, the lifting assembly moves upward along the axis of the valve passage 2, and under the drive of the pusher, the elastic extrusion member can extrude the sealing ring 10, so that the sealing ring 10 reserved outside the inner channel 201 is pressed into the inner channel 201, so that the effective sealing thickness in the valve passage 2 is maintained within a stable range. Step 3: After the valve body 1 cools down, the packing plate 7 is reset, allowing the sealing ring 10 pressed into the inner channel 201 to extend out again, avoiding plastic deformation caused by long-term compression.

[0040] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0041] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing, comprising a valve body (1), a valve core (3) rotatably disposed inside the valve body (1), a valve passage (2) fixedly connected to the valve body (1), and a valve stem (6) fixed to the valve core (3) along the axial direction of the valve passage (2), characterized in that: An inner channel (201) communicating with the inner side of the valve body (1) is formed in the valve passage (2). A packing plate (7) is sealed and connected in the inner channel (201). When a high-temperature medium passes through the valve core (3), the packing plate (7) is pressed and the lifting assembly set on the packing plate (7) moves up along the axial direction of the valve passage (2). It also includes a sealing ring (10), one end of which is disposed in the inner channel (201) and the other end extends out of the inner channel (201). When the lifting assembly rises, the elastic extrusion member installed in the valve channel (2) can press down on the sealing ring (10), so that the sealing ring (10) reserved outside the inner channel (201) is pressed into the inner channel (201).

2. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 1, characterized in that, A first limiting ring (4) is fixedly provided on the inner wall of the inner channel (201), and the first limiting ring (4) can limit the packing pressure plate (7).

3. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 1, characterized in that, The lifting assembly includes a connecting plate (8) fixedly installed on the upper end of the packing pressure plate (7). The connecting plate (8) is coaxially arranged with the valve stem (6) and the valve stem (6) can pass through the connecting plate (8). A lifting cylinder (9) is provided on the connecting plate (8). A plurality of U-shaped grooves (901) are distributed on the circumference of the lifting cylinder (9). The lifting cylinder (9) can pass through the sealing ring (10) and slide in connection with the sealing ring (10).

4. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 3, characterized in that, A spring (12) is provided in the inner channel (201). One end of the spring (12) abuts against the sealing ring (10), and the other end abuts against the connecting plate (8).

5. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 3, characterized in that, A pusher is fixedly installed on the lifting cylinder (9) to drive the elastic extruder to press down.

6. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 5, characterized in that, The pusher includes a transmission sleeve (14), which is arranged along the axis of the lifting cylinder (9), and one end of the transmission sleeve (14) is detachably connected to the lifting cylinder (9), and a ball bearing (1401) is formed on the other end.

7. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 6, characterized in that, The elastic extrusion member includes a valve cover (11), which is slidably connected to the inner wall of the valve channel (2). A sleeve (15) is provided along the axial direction of the valve channel (2). The sleeve (15) is slidably sleeved on one end of the transmission sleeve (14), and the inner cavity of the sleeve (15) forms an internal thread groove (1501) that slides with the ball (1401). It also includes a disc spring (13), which is disposed between the valve cover (11) and the sealing ring (10). One end of the disc spring (13) abuts against the valve cover (11), and the other end abuts against the sealing ring (10).

8. The pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing according to claim 7, characterized in that, A second limiting ring (5) is fixedly provided on the inner wall of the valve passage (2), and the second limiting ring (5) is used to limit the valve cover (11).

9. A method of using a pre-tightened sealing disc spring high-temperature fixed ball valve with live load pressure plate packing, characterized in that, The pre-tightened sealing disc spring high-temperature fixed ball valve using live-load pressure plate packing as described in any one of claims 1-8 includes the following steps: Step 1: When a high-temperature medium passes through the valve core (3), the internal air pressure of the valve body (1) increases. Due to the sealing structure between the valve core (3) and the valve body (1), the pressure of the medium will be transmitted to the packing plate (7) inside the valve body (1). At this time, the gas squeezes the packing plate (7) to reduce its thickness. Step 2: When the packing plate (7) is subjected to upward pressure, the lifting assembly moves upward along the axis of the valve passage (2), and under the drive of the pusher, the elastic extrusion member can extrude the sealing ring (10), so that the sealing ring (10) reserved outside the inner channel (201) is pressed into the inner channel (201), so that the effective sealing thickness in the valve passage (2) is maintained within a stable range. Step 3: After the valve body (1) cools down, the packing plate (7) is reset, so that the sealing ring (10) pressed into the inner channel (201) can be extended again to avoid plastic deformation caused by long-term compression.

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