A butterfly valve with bidirectional sealing

Abstract

The application relates to a bidirectional sealing butterfly valve, relates to the field of bidirectional sealing butterfly valve technology, and comprises a valve body, a rotating valve rod and a butterfly plate, a sealing convex ring is integrally arranged on the inner side wall of the valve body, a sealing taper surface in the shape of a conical surface is arranged on the outer edge of the butterfly valve, and the sealing taper surface is arranged to be inwardly recessed in the direction close to the sealing convex ring; a first J-shaped ring and a second J-shaped ring are detachably arranged on the sealing convex ring, the first J-shaped ring is located between the butterfly plate and the rotating valve rod, the J-shaped opening of the first J-shaped ring is arranged to face the direction close to the butterfly plate, and the J-shaped opening of the second J-shaped ring is arranged to face the direction away from the butterfly plate. The application can facilitate maintenance personnel to maintain and replace the sealing structure in the butterfly valve.

Description

Technical Field

[0001] This application relates to the field of bidirectional sealing butterfly valve technology, and in particular to a bidirectional sealing butterfly valve. Background Technology

[0002] An eccentric butterfly valve is a type of valve that uses a disc-shaped opening and closing element to reciprocate 90° to open, close, or regulate the flow of media. Butterfly valves are not only simple in structure, small in size, lightweight, economical in material consumption, small in installation dimensions, low in driving torque, and convenient and quick to operate, but they also have excellent flow regulation capabilities and sealing characteristics, making them one of the fastest-growing valve types in the past decade or so.

[0003] In existing technologies, common butterfly valves mainly include components such as a rotating valve stem, a butterfly plate, a valve body, and a sealing ring. A handwheel or actuator applies a rotational torque to rotate the valve stem. The rotating valve stem is supported by valve stem bushings inside the upper and lower valve stem holes of the valve body. The rotating valve stem and the butterfly plate are connected by pins, square bolts, or other connecting parts, causing the butterfly plate to rotate. The sealing assembly is mounted on the butterfly plate. When the butterfly plate rotates to the fully closed position, the outer circumference of the butterfly plate completely contacts the sealing ring, achieving a seal.

[0004] However, the sealing rings of existing butterfly valves are generally rigidly fixed to the butterfly plate, with the valve body mating with a hard alloy weld. As the butterfly valve is used for a longer period, the flowing pipeline medium will erode the sealing rings on the butterfly plate over time, causing the soft sealing material of the sealing rings to be lost, thus affecting its sealing performance. Utility Model Content

[0005] To facilitate maintenance personnel in maintaining and replacing the sealing structure inside the butterfly valve, this application provides a bidirectional sealing butterfly valve.

[0006] The bidirectional sealing butterfly valve provided in this application adopts the following technical solution:

[0007] A bidirectional sealing butterfly valve includes a valve body, a rotating valve stem, and a butterfly plate. A sealing protrusion ring is integrally formed on the inner wall of the valve body, and a sealing cone surface is provided on the outer edge of the butterfly valve in a conical shape. The sealing cone surface is recessed inward along the direction close to the sealing protrusion ring.

[0008] A first J-ring and a second J-ring are detachably installed on the sealing convex ring. The first J-ring is located between the butterfly plate and the rotary valve stem. The J-shaped opening of the first J-ring faces towards the butterfly plate, and the J-shaped opening of the second J-ring faces away from the butterfly plate.

[0009] By adopting the above technical solution, the first J-ring and the second J-ring are detachably installed on the sealing convex ring, facilitating their replacement and ensuring the sealing performance of the butterfly valve. Simultaneously, when the butterfly plate is closed, the first and second J-rings are pressed against the sealing cone surface on the butterfly plate. Since the J-shaped openings of the first and second J-rings face towards and away from the butterfly plate, respectively, the first J-ring ensures the valve's sealing performance when the medium flows in the forward direction; conversely, the second J-ring ensures the valve's sealing performance when the medium flows in the reverse direction. This allows the butterfly valve to provide good sealing performance under both forward and reverse operating conditions.

[0010] Preferably, the sealing ring has an installation ring groove on the side near the valve stem, and a positioning ring is detachably installed on the side of the sealing ring near the butterfly plate by bolts. The first J-ring and the second J-ring are tightly installed between the positioning ring and the inner wall of the installation ring groove.

[0011] By adopting the above technical solution, the first J-ring and the second J-ring can be detachably installed through the mounting ring grooves on the positioning ring and the sealing convex ring. When it is necessary to replace the first J-ring and the second J-ring, the relevant maintenance personnel can remove the mounting ring to facilitate the replacement of the first J-ring and the second J-ring.

[0012] Preferably, the inner wall surfaces of the positioning ring and the sealing convex ring are integrally formed with a mating conical surface, which is recessed inward in the direction away from the butterfly plate.

[0013] By adopting the above technical solution, the mating conical surface on the inner side of the sealing ring and the sealing conical surface on the outer side of the sealing ring are used in combination, which can improve the compactness of the structure between the butterfly plate and the sealing ring.

[0014] Preferably, the valve stem is integrally formed with a hexagonal mating part, and the butterfly plate is provided with a matching hexagonal hole, and the hexagonal mating part is installed in the matching hexagonal hole with a small interference fit.

[0015] By adopting the above technical solution, the backlash generated during the reverse movement of the butterfly plate can be eliminated by setting the hexagonal mating part on the valve stem and the matching hexagonal hole on the butterfly plate, while improving the mating rigidity between the valve stem and the butterfly plate.

[0016] Preferably, the valve stem bushings are installed in the upper valve stem hole and the lower valve stem hole of the valve body with a small interference fit.

[0017] By adopting the above technical solution, the small interference fit between the valve stem bushing and the upper and lower valve stem holes can be reduced by installing the valve stem bushing with a small interference fit between the valve stem bushing and the upper and lower valve stem holes.

[0018] In summary, the bidirectional sealing butterfly valve of this application has at least one of the following beneficial technical effects:

[0019] 1. The first J-ring and the second J-ring can be detachably installed through the mounting ring groove on the positioning ring and the sealing convex ring; when it is necessary to replace the first J-ring and the second J-ring, the relevant maintenance personnel can remove the mounting ring to facilitate the replacement of the first J-ring and the second J-ring;

[0020] 2. When the butterfly plate is closed, the first J-ring and the second J-ring are pressed against the sealing convex ring and the sealing cone surface on the butterfly plate. Since the J-shaped openings of the first J-ring and the second J-ring face towards the butterfly plate and away from the butterfly plate, respectively, when the medium flows in the forward direction, the first J-ring can ensure the sealing performance of the butterfly valve; if the medium flows in the reverse direction, the second J-ring can ensure the sealing performance of the butterfly valve, so that the butterfly valve can provide good sealing performance under both forward and reverse operating conditions.

[0021] 3. By setting the hexagonal mating part on the valve stem and the matching hexagonal hole on the butterfly plate, the backlash generated during the reverse movement of the butterfly plate can be eliminated, while improving the fit rigidity between the valve stem and the butterfly plate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram illustrating the internal structure of a butterfly valve in an embodiment of this application.

[0023] Figure 2 yes Figure 1 The enlarged structural diagram at point A is mainly used to show the installation structure of the first J-ring and the second J-ring.

[0024] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Rotary valve stem; 21. Hexagonal mating part; 3. Butterfly plate; 4. Sealing convex ring; 5. First J-ring; 6. Second J-ring; 7. Positioning ring; 8. Valve stem bushing. Detailed Implementation

[0025] The following combination Figures 1-2 This application will be described in further detail.

[0026] This application discloses a bidirectional sealing butterfly valve. (Refer to...) Figure 1 It mainly includes a valve body 1, a rotary valve stem 2 and a butterfly plate 3. A sealing convex ring 4 is integrally formed on the inner side wall of the valve body 1, and a conical sealing cone is provided on the outer edge of the butterfly valve. The sealing cone is set inward along the direction close to the sealing convex ring 4.

[0027] A first J-ring 5 and a second J-ring 6 are detachably installed on the sealing ring 4. The first J-ring 5 is located between the butterfly plate 3 and the rotary valve stem 2. The J-shaped opening of the first J-ring 5 is set towards the direction close to the butterfly plate 3, and the J-shaped opening of the second J-ring 6 is set towards the direction away from the butterfly plate 3.

[0028] By detachably installing the first J-ring 5 and the second J-ring 6 onto the sealing convex ring 4, it is easy to replace the first J-ring 5 and the second J-ring 6 to ensure the sealing performance of the butterfly valve.

[0029] Meanwhile, when the butterfly plate 3 is in the closed state, the first J-ring 5 and the second J-ring 6 are pressed against the sealing cone surface on the sealing convex ring 4 and the butterfly plate 3. Since the J-shaped openings of the first J-ring 5 and the second J-ring 6 face the direction closer to the butterfly plate 3 and away from the butterfly plate 3, respectively, when the medium flows in the forward direction, the sealing performance of the butterfly valve can be ensured by the first J-ring 5; if the medium flows in the reverse direction, the sealing performance of the butterfly valve can be ensured by the second J-ring 6, so that the butterfly valve can provide good sealing performance under both forward and reverse operating conditions.

[0030] Reference Figure 2 The sealing ring 4 has an installation ring groove on the side near the valve stem. The sealing ring 4 has a positioning ring 7 that can be detachably installed on the side near the butterfly plate 3 by bolts. The first J-ring 5 and the second J-ring 6 are tightly installed between the positioning ring 7 and the inner wall of the installation ring groove.

[0031] The first J-ring 5 and the second J-ring 6 can be detachably installed via the mounting ring groove on the positioning ring 7 and the sealing convex ring 4. When it is necessary to replace the first J-ring 5 and the second J-ring 6, the relevant maintenance personnel can remove the mounting ring to facilitate the replacement of the first J-ring 5 and the second J-ring 6.

[0032] In this embodiment, the inner wall surfaces of the positioning ring 7 and the sealing convex ring 4 are integrally formed with a mating conical surface, which is recessed inward in the direction away from the butterfly plate 3.

[0033] The mating conical surface on the inner side of the sealing ring 4 and the sealing conical surface on the outer side of the sealing ring 4 are used together to improve the compactness of the structure between the butterfly plate 3 and the sealing ring 4.

[0034] Reference Figure 1 The valve stem has an integrally formed hexagonal mating part 21, and the butterfly plate 3 has a matching hexagonal hole. The hexagonal mating part 21 is installed in the matching hexagonal hole with a small interference fit. By setting the hexagonal mating part 21 on the valve stem and the matching hexagonal hole on the butterfly plate 3, the backlash generated during the reverse movement of the butterfly plate 3 can be eliminated, and the fit rigidity between the valve stem and the butterfly plate 3 can be improved.

[0035] In this embodiment, the valve stem bushing 8 is installed in the upper valve stem hole and the lower valve stem hole in the valve body 1 with a small interference fit. By installing the valve stem bushing 8 in the upper valve stem hole and the lower valve stem hole with a small interference fit, the fit clearance between the valve stem bushing 8 and the upper valve stem hole and the lower valve stem hole can be reduced.

[0036] It should be noted that, in this embodiment, the assembly process of the valve stem bushing 8 with the upper valve stem hole (or lower valve stem hole) and the butterfly plate 3 with the rotary valve stem 2 is as follows: Before assembly, the valve stem bushing 8 and the rotary valve stem 2 are soaked in cold water for 2 hours, so that the outer diameter of the valve stem bushing 8 and the rotary valve stem 2 is reduced due to the effect of cold contraction, so that the valve stem bushing 8 can be installed into the upper valve stem hole or the lower valve stem hole, and the hexagonal mating part 21 on the rotary valve stem 2 can be installed into the matching hexagonal hole on the butterfly plate 3. After the valve stem bushing 8 and the rotary valve stem 2 are assembled and left to stand for a period of time and return to room temperature, the gap between the valve stem bushing 8 and the upper and lower valve stem holes, and between the hexagonal mating part 21 on the rotary valve stem 2 and the matching hexagonal hole on the butterfly plate 3, is reduced, becoming a small interference fit.

[0037] The implementation principle of a bidirectional sealing butterfly valve according to an embodiment of this application is as follows: the first J-ring 5 and the second J-ring 6 can be detachably installed through the mounting ring groove on the positioning ring 7 and the sealing convex ring 4; when the first J-ring 5 and the second J-ring 6 need to be replaced, the relevant maintenance personnel can remove the mounting ring to facilitate the replacement of the first J-ring 5 and the second J-ring 6; when the butterfly plate 3 is in the closed state, the first J-ring 5 and the second J-ring 6 are pressed between the sealing convex ring 4 and the sealing cone surface on the butterfly plate 3. Since the J-shaped openings of the first J-ring 5 and the second J-ring 6 face the direction closer to the butterfly plate 3 and away from the butterfly plate 3 respectively, when the medium flows in the forward direction, the sealing performance of the butterfly valve can be ensured by the first J-ring 5; if the medium flows in the reverse direction, the sealing performance of the butterfly valve can be ensured by the second J-ring 6, so that the butterfly valve can provide good sealing performance under both forward and reverse operating conditions.

[0038] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A bidirectional sealing butterfly valve, characterized in that, The valve includes a valve body (1), a rotary valve stem (2), and a butterfly plate (3). A sealing ring (4) is integrally formed on the inner wall of the valve body (1), and a sealing cone surface is provided on the outer edge of the butterfly valve. The sealing cone surface is set inward along the direction close to the sealing ring (4). The sealing ring (4) is detachably equipped with a first J-ring (5) and a second J-ring (6). The first J-ring (5) is located between the butterfly plate (3) and the rotary valve stem (2). The J-shaped opening of the first J-ring (5) is set towards the direction close to the butterfly plate (3), and the J-shaped opening of the second J-ring (6) is set towards the direction away from the butterfly plate (3).

2. The bidirectional sealing butterfly valve according to claim 1, characterized in that, The sealing ring (4) has an installation ring groove on the side near the valve stem. The sealing ring (4) has a positioning ring (7) that can be detachably installed on the side near the butterfly plate (3) by bolts. The first J-ring (5) and the second J-ring (6) are tightly installed between the positioning ring (7) and the inner wall of the installation ring groove.

3. A bidirectional sealing butterfly valve according to claim 2, characterized in that, The positioning ring (7) and the inner wall surface of the sealing convex ring (4) are integrally formed with a mating conical surface, which is set inward along the direction away from the butterfly plate (3).

4. A bidirectional sealing butterfly valve according to claim 3, characterized in that, The valve stem is integrally formed with a hexagonal mating part (21), and the butterfly plate (3) is provided with a matching hexagonal hole. The hexagonal mating part (21) is installed in the matching hexagonal hole with a small interference fit.

5. A bidirectional sealing butterfly valve according to claim 1, characterized in that, The valve stem bushing (8) is installed in the upper valve stem hole and the lower valve stem hole in the valve body (1) with a small interference fit.

Images