Low-temperature butterfly valve bidirectional sealing ring for ship

Abstract

The utility model relates to a kind of marine cryogenic butterfly valve bidirectional sealing ring, marine cryogenic butterfly valve bidirectional sealing ring, the bidirectional sealing ring is composed of non-metallic sealing ring, spring and metal support framework, or by non-metallic sealing ring, spring and elastic sealing ring, spring is distributed in non-metallic sealing ring, and the sealing lip of non-metallic sealing ring is supported and compensates;Metal support framework is set in the middle of distributed spring, while increasing the pressure-bearing capacity of sealing ring to spring support, can adapt to the working condition of large opening butterfly valve sealing force larger.The bidirectional sealing ring of the utility model, through the multiple combination of metal and non-metal, non-metallic sealing ring is designed as lip structure, and different ways of spring are added to compensate, easy to install and maintain, can realize low temperature and normal temperature bidirectional sealing, sealing effect is good, can realize the requirement of zero leakage, sealing ring overall combination, easy to install, with fireproof function simultaneously, meet the requirement of marine cryogenic butterfly valve to sealing.

Description

Technical Field

[0001] This utility model belongs to the field of sealing ring technology, specifically relating to a bidirectional sealing ring for marine cryogenic butterfly valves. Background Technology

[0002] Due to space constraints on ships, many parts of cryogenic butterfly valves cannot use ball valves, which have better sealing performance but larger structural volume. At the same time, some areas cannot adopt a redundant design of dual valves. Therefore, cryogenic butterfly valves are required to have excellent sealing performance.

[0003] Currently, many marine cryogenic butterfly valves require zero leakage at both ambient and cryogenic temperatures, as well as zero leakage in both forward and reverse directions. Furthermore, as shut-off valves for cryogenic media such as LNG and ethylene, excellent fire resistance is also essential. Conventional double-eccentric butterfly valves use rubber or elastic metal as sealing rings, which cannot simultaneously meet these requirements. Triple-eccentric butterfly valves, on the other hand, require highly skilled personnel to replace their sealing rings, posing challenges for marine maintenance.

[0004] For example, Chinese invention patent application CN115750813A discloses a self-compensating positive feedback cryogenic butterfly valve sealing structure, which is disposed between the valve body and the butterfly plate of the butterfly valve. It includes: a first annular pressure plate, the upper surface of which is in contact with the valve body, and the lower surface of the first annular pressure plate having a stepped structure; a second annular pressure plate, disposed below the first annular pressure plate, with a groove formed between the first annular pressure plate, the second annular pressure plate, and the butterfly plate; an arc-shaped sealing ring disposed within the groove; and a sealing pressure ring disposed within the arc-shaped sealing ring. This invention has good overall sealing performance and a wide range of applications, mainly used in cryogenic, single-phase fluid, and multiphase fluid butterfly valves or similar products. Due to the self-compensating function and fatigue damage resistance of the arc-shaped sealing ring, the structure is simple, easy to install, debug, repair, and maintain, and the overall structure is compact, highly adaptable, and highly reliable. However, this sealing structure relies on the metal arc-shaped sealing ring for both forward and reverse sealing, and a simple metal sealing ring cannot completely achieve bidirectional zero leakage, resulting in a lack of sealing effect. Summary of the Invention

[0005] To address the problems existing in the prior art, this utility model proposes a bidirectional sealing ring for marine cryogenic butterfly valves. By adopting a dual structure design of non-metallic and metallic components, the rotary circular structure facilitates installation and replacement.

[0006] This utility model proposes a bidirectional sealing ring for marine cryogenic butterfly valves. The bidirectional sealing ring consists of a non-metallic sealing ring, a spring, and a metal support frame, or it consists of a non-metallic sealing ring, a spring, and an elastic sealing ring. The springs are distributed within the non-metallic sealing ring, providing support and compensation for the sealing lip. A metal support frame is placed between the distributed springs, supporting the springs while increasing the sealing ring's pressure-bearing capacity, enabling it to adapt to the high sealing force conditions of large-diameter butterfly valves. Depending on the butterfly valve's structural design, this sealing ring can be flexibly installed on the valve seat or disc. When installed on the valve seat, the sealing ring forms a seal with the disc's sealing surface; when installed on the disc, the sealing ring forms a seal with the valve seat's sealing surface. The resulting sealing pairs are all metal-to-metal + non-metal seals.

[0007] When the bidirectional sealing ring of the marine cryogenic butterfly valve of this utility model is composed of a non-metallic sealing ring, a spring, and an elastic sealing ring, it is suitable for small-diameter butterfly valves; when the bidirectional sealing ring is composed of a non-metallic sealing ring, a spring, and a metal support frame, it is suitable for large-diameter butterfly valves, with a metal support frame added in the middle and elastic metal sealing rings respectively set on both sides to form a multi-seal structure.

[0008] This utility model relates to a bidirectional sealing ring for marine cryogenic butterfly valves. Through multiple combinations of metal and non-metal elements, the non-metallic sealing ring is designed with a lip structure and various types of springs are added for compensation. It is easy to install and maintain, and can achieve bidirectional sealing at both low and normal temperatures. The sealing effect is excellent, and it can meet the requirement of zero leakage. The sealing ring is an integral assembly, which is easy to install and also has a fireproof function, meeting the sealing requirements of marine cryogenic butterfly valves.

[0009] Preferably, the non-metallic sealing ring has lips on both its left and right sides. During operation, the lips open under the force of the medium and the action of the spring, achieving a seal. The outer side of the lips has a first lip protrusion and a second lip protrusion. The non-metallic sealing ring adopts a bidirectional lip design, where the corresponding lips are opened by the medium pressure to achieve a good seal. After the valve is closed, the disc or valve seat compresses the sealing ring, and the spring deforms to provide initial pre-tightening for the seal. As the pressure of the medium in the pipeline increases, the medium pressure opens the lips of the non-metallic sealing ring, and the medium pressure assists the sealing ring in achieving a seal, ensuring the valve's sealing effectiveness in both low-pressure and high-pressure environments.

[0010] The flange, designed according to the butterfly valve's specifications, contacts the valve seat or disc to achieve a seal. The bidirectional lip can effectively seal media from both directions. When the medium is under pressure on one side, if a slight leak occurs in the first lip flange, the second lip flange, under the action of a spring, can also achieve a secondary seal.

[0011] In any of the above embodiments, it is preferred that the non-metallic sealing ring is made of ultra-high molecular weight polyethylene (UPE), which has good wear resistance and low-temperature resistance, as well as good elasticity. When the valve is closed, it seals through lip deformation, and the sealing compensation and support are provided by a spring on the back. The spring is made of a corrosion-resistant and low-temperature-resistant alloy material and is wound in a spiral manner.

[0012] In any of the above solutions, the preferred option is that the bidirectional sealing ring is an elastic rotary circular structure, which is suitable for double eccentric butterfly valves. During installation, there is no need to align the angle with the traditional triple eccentric sealing ring structure, making installation convenient. The sealing rings have a certain elastic deformation capacity and compensation capacity, and the sealing effect is excellent at both room temperature and low temperature.

[0013] In any of the above solutions, it is preferred that the bidirectional sealing ring is clamped between the left and right pressure plates by bolts, so that the sealing ring can be replaced as a whole during installation and replacement; both the left and right pressure plates are provided with positioning steps, and positioning is achieved by the positioning steps between the pressure plates, eliminating the need for additional positioning of the non-metallic sealing ring, making installation and replacement convenient.

[0014] In any of the above solutions, it is preferred that the bidirectional sealing ring is installed on the valve seat or disc of the butterfly valve to achieve sealing of the butterfly valve.

[0015] In any of the above solutions, it is preferred that the elastic sealing ring, the left pressure plate, and the right pressure plate are all provided with a spiral sawtooth structure, thereby increasing the sealing performance of the contact parts after installation.

[0016] In any of the above embodiments, it is preferred that the elastic sealing ring is a rotating structural component with one end curled and the other end bent, which is sandwiched between a set of non-metallic sealing rings.

[0017] In any of the above embodiments, it is preferred that the curled structure of the elastic sealing ring is located on the inner or outer side of the sealing ring body. When the sealing ring needs to be installed on the disc plate, the curled structure of the elastic sealing ring is inward; when the sealing ring needs to be installed on the valve seat, the curled structure of the elastic sealing ring is outward.

[0018] In any of the above solutions, it is preferred that both the left and right pressure plates are provided with metal elastic sheets, which can withstand the scouring of the medium during normal operation and prevent the medium from directly acting on the non-metallic sealing ring 1; when the non-metallic sealing ring is damaged in the event of a fire, the sealing can continue to be achieved through the two metal elastic sheets, thus playing a role in fire prevention.

[0019] In any of the above embodiments, it is preferred that the middle part of the non-metallic sealing ring is provided with a wound metal elastic sheet, which plays an auxiliary sealing role by deformation during normal operation, and together with the boss of the non-metallic sealing ring, a triple sealing structure is achieved; when the non-metallic sealing rings on both sides are damaged in the event of a fire, the wound metal elastic sheet can continue to achieve sealing, thus playing a fireproof role.

[0020] In summary, the bidirectional sealing ring for marine cryogenic butterfly valves of this utility model has the following advantages: Springs are distributed within the non-metallic sealing ring, providing support and compensation for the sealing lip; a metal support frame is installed in the middle of the distributed springs, supporting the springs while increasing the pressure-bearing capacity of the sealing ring, adapting to the high sealing force of large-diameter butterfly valves; the non-metallic sealing ring adopts a bidirectional lip design, using medium pressure to open the corresponding lips for a good seal; the bidirectional sealing ring is clamped between the left and right pressure plates by bolts, allowing for complete replacement during installation and replacement; both the left and right pressure plates have positioning steps, allowing for positioning between the pressure plates without additional positioning of the non-metallic sealing ring 1, making installation and replacement convenient; both the left and right pressure plates have metal elastic sheets, which withstand medium erosion during normal operation, preventing the medium from directly acting on the non-metallic sealing ring; the middle part of the non-metallic sealing ring has a wound metal elastic sheet, which deforms during normal operation to assist in sealing, achieving a triple sealing structure together with the boss of the non-metallic sealing ring.

[0021] Explanation of icon numbers

[0022] 1. Non-metallic sealing ring, 11. First lip protrusion, 12. Second lip protrusion, 13. Spiral serrated structure, 2. Spring, 3. Metal support frame, 4. Elastic sealing ring, 5. Left pressure plate, 6. Right pressure plate, 7. Bolt, 8. Valve seat, 9. Disc. Attached Figure Description

[0023] Figure 1 A schematic diagram showing the application of the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model to a large-diameter butterfly valve mounted on a disc plate.

[0024] Figure 2 This is a schematic diagram showing the application of the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model to a large-diameter butterfly valve, installed on the valve seat.

[0025] Figure 3 This is a schematic diagram of a preferred embodiment of the bidirectional sealing ring for a marine cryogenic butterfly valve according to the present invention.

[0026] Figure 4 For the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model Figure 3 Another structural schematic diagram of the preferred embodiment shown.

[0027] Figure 5 A schematic diagram showing the application of the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model to a small-diameter butterfly valve mounted on a disc plate.

[0028] Figure 6 This is a schematic diagram showing the application of the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model to a small-diameter butterfly valve, installed on the valve seat.

[0029] Figure 7 For the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model Figure 6 The diagram shows a structural schematic of the non-metallic sealing ring in the preferred embodiment.

[0030] Figure 8 For the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model Figure 6 The preferred embodiment shown is a cross-sectional view of the elastic sealing ring curled structure facing inwards.

[0031] Figure 9 For the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model Figure 6 The preferred embodiment shown is a cross-sectional view of the elastic sealing ring curled structure facing outwards. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] like Figure 1 , Figure 2 As shown, a bidirectional sealing ring for a marine cryogenic butterfly valve is provided. The bidirectional sealing ring consists of a non-metallic sealing ring 1, a spring 2, and a metal support frame 3, or it consists of a non-metallic sealing ring 1, a spring 2, and an elastic sealing ring 4 (see...). Figure 5 , Figure 6 As shown, springs 2 are distributed within the non-metallic sealing ring 1, providing support and compensation for the sealing lip of the non-metallic sealing ring 1. A metal support frame 3 is set in the middle of the distributed springs 2, which supports the springs 2 while increasing the pressure-bearing capacity of the sealing ring, enabling it to adapt to the high sealing force conditions of large-diameter butterfly valves. Depending on the butterfly valve's structural design, the sealing ring can be flexibly installed on the valve seat 8 or the disc 9. When installed on the valve seat 8, the sealing ring forms a seal with the sealing surface of the disc 9; when installed on the disc 9, the sealing ring forms a seal with the sealing surface of the valve seat. The resulting sealing pairs are all metal-to-metal + non-metal seals.

[0034] When the bidirectional sealing ring of the marine cryogenic butterfly valve of this utility model is composed of a non-metallic sealing ring 1, a spring 2 and an elastic sealing ring 4, it is suitable for small-diameter butterfly valves; when the bidirectional sealing ring is composed of a non-metallic sealing ring 1, a spring 2 and a metal support frame 3, it is suitable for large-diameter butterfly valves, with a metal support frame added in the middle and elastic metal sealing rings respectively set on both sides to form a multi-seal structure.

[0035] When the bidirectional sealing ring is composed of a non-metallic sealing ring 1, a spring 2, and an elastic sealing ring 4, the non-metallic sealing ring 1 forms a group that clamps the elastic sealing ring 4 in the middle, and the two non-metallic sealing rings 1 are arranged one above the other (see...). Figures 5-7 (As shown).

[0036] In this embodiment, when the bidirectional sealing ring is composed of a non-metallic sealing ring 1, a spring 2, and a metal support frame 3, the spring 2 is supported in the grooves at the upper and lower ends of the non-metallic sealing ring 1 by the metal support frame 3; when the bidirectional sealing ring is composed of a non-metallic sealing ring 1, a spring 2, and an elastic sealing ring 4, the spring 2 is directly embedded in the grooves at the upper and lower ends of the non-metallic sealing ring 1 (see...). Figures 5-7 (As shown).

[0037] In this embodiment, the bidirectional sealing ring is an elastic rotary circular structure, suitable for double eccentric butterfly valves. During installation, it does not require angle alignment with the traditional triple eccentric sealing ring structure, making installation convenient. The sealing rings have a certain elastic deformation capacity and compensation capacity, and the sealing effect is excellent at both room temperature and low temperature.

[0038] In this embodiment, the bidirectional sealing ring is clamped between the left pressure plate 5 and the right pressure plate 6 by bolts 7, so that the sealing ring can be replaced as a whole during installation and replacement; both the left pressure plate 5 and the right pressure plate 6 are provided with positioning steps, and positioning is achieved by the positioning steps of the pressure plate 5 and the pressure plate 6, without the need for additional positioning of the non-metallic sealing ring 1, making installation and replacement convenient.

[0039] In this embodiment, the bidirectional sealing ring is installed on the valve seat 8 or the disc 9 of the butterfly valve to achieve sealing of the butterfly valve.

[0040] In this embodiment, the elastic sealing ring 4, the left pressure plate 5, and the right pressure plate 6 are all provided with a spiral sawtooth structure 13, thereby increasing the sealing performance of the contact parts after installation.

[0041] In this embodiment, both the left pressure plate 5 and the right pressure plate 6 are provided with metal elastic sheets. During normal operation, they withstand the scouring of the medium and prevent the medium from directly acting on the non-metallic sealing ring 1. When the non-metallic sealing ring 1 is damaged in the event of a fire, the two metal elastic sheets at the front and back can continue to achieve sealing, thus playing a fireproof role.

[0042] In this embodiment, the middle part of the non-metallic sealing ring 1 is provided with a wound metal elastic sheet. During normal operation, it plays an auxiliary sealing role by deformation, and together with the boss of the non-metallic sealing ring 1, it achieves a triple sealing structure. When a fire occurs and the non-metallic sealing rings 1 on both sides are damaged, the wound metal elastic sheet can continue to achieve sealing, thus playing a fireproof role.

[0043] See Figure 3 , Figure 4The diagram shown is a structural schematic of a preferred embodiment of the bidirectional sealing ring for a marine cryogenic butterfly valve according to this utility model.

[0044] In this embodiment, the non-metallic sealing ring 1 has lips on both its left and right sides. During operation, the lips open under the force of the medium and the action of the spring, achieving a seal. The outer side of the lips has a first lip protrusion 11 and a second lip protrusion 12. The non-metallic sealing ring 1 adopts a bidirectional lip design, where the corresponding lips are opened by the medium pressure to achieve a good seal. After the valve is closed, the disc 9 or valve seat 8 compresses the sealing ring, and the spring 2 deforms to provide initial pre-tightening for the seal. As the pipeline medium pressure increases, the medium pressure opens the lips of the non-metallic sealing ring, and the medium pressure assists the sealing ring in achieving a seal, thus ensuring the valve's sealing effectiveness in both low-pressure and high-pressure environments.

[0045] The boss, designed according to the butterfly valve design, contacts the valve seat 8 or the disc 9 to achieve a seal. The bidirectional lip can effectively achieve bidirectional media sealing. When the medium is under pressure on one side, if the first lip boss 11 experiences a slight leak, the second lip boss 12 can also achieve a secondary seal under the action of the spring 2.

[0046] In this embodiment, the non-metallic sealing ring 1 is made of ultra-high molecular weight polyethylene (UPE), which has good wear resistance and low-temperature resistance, as well as good elasticity. When the valve is closed, it seals through lip deformation, and the sealing is compensated and supported by a spring on the back. The spring is made of a corrosion-resistant and low-temperature-resistant alloy material and is wound in a spiral manner.

[0047] See last for reference. Figure 8 , Figure 9 As shown, the bidirectional sealing ring of the marine cryogenic butterfly valve according to this utility model... Figure 6 A cross-sectional view of the elastic sealing ring in the preferred embodiment shown.

[0048] In this embodiment, the elastic sealing ring 4 is a rotating structural component with one end curled and the other end bent, which is sandwiched between a set of non-metallic sealing rings.

[0049] In this embodiment, the curled structure of the elastic sealing ring 4 is located on the inner or outer side of the sealing ring body. When the curled structure is located on the inner side of the sealing ring body, the bending structure at the other end faces outward; when the curled structure is located on the outer side of the sealing ring body, the bending structure at the other end faces inward. When the sealing ring needs to be installed on a disc plate, the curled structure of the elastic sealing ring 4 is used with the curled structure facing inward (see...). Figure 8 (as shown); when the sealing ring needs to be installed on the valve seat, the outward curling structure of the elastic sealing ring 4 is used (see...). Figure 9 (As shown).

[0050] It will be readily understood by those skilled in the art that the bidirectional sealing ring for the marine cryogenic butterfly valve of this utility model comprises any combination of the parts described in this specification. Due to space limitations and for the sake of brevity, these combinations are not described in detail here, but after reading this specification, the scope of this utility model, which consists of any combination of the parts described in this specification, is self-evident.

Claims

1. A bidirectional sealing ring for a marine cryogenic butterfly valve, characterized in that: The bidirectional sealing ring is composed of a non-metallic sealing ring (1), a spring (2) and a metal support frame (3), or it is composed of a non-metallic sealing ring (1), a spring (2) and an elastic sealing ring (4), with the spring (2) distributed inside the non-metallic sealing ring (1).

2. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 1, characterized in that: The non-metallic sealing ring (1) has a lip shape on both the left and right sides, and the outer side of the lip is provided with a first lip protrusion (11) and a second lip protrusion (12); the non-metallic sealing ring (1) is made of ultra-high molecular weight polyethylene material.

3. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 1 or 2, characterized in that: The bidirectional sealing ring has an elastic, rotating circular structure.

4. The bidirectional sealing ring for marine cryogenic butterfly valves as described in claim 1 or 2, characterized in that: The bidirectional sealing ring is clamped between the left pressure plate (5) and the right pressure plate (6) by bolts (7), so that the sealing ring can be replaced as a whole during installation and replacement; both the left pressure plate (5) and the right pressure plate (6) are provided with positioning steps.

5. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 1 or 2, characterized in that: The bidirectional sealing ring is installed on the valve seat (8) or disc (9) of the butterfly valve.

6. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 4, characterized in that: The elastic sealing ring (4), the left pressure plate (5), and the right pressure plate (6) are all provided with a spiral sawtooth structure (13).

7. The bidirectional sealing ring for marine cryogenic butterfly valves as described in claim 1 or 6, characterized in that: The elastic sealing ring (4) is a rotating structural component with one end curled and the other end bent, which is sandwiched between a set of non-metallic sealing rings (1).

8. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 7, characterized in that: The curled structure of the elastic sealing ring (4) is located on the inside or outside of the sealing ring body.

9. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 6, characterized in that: Both the left pressure plate (5) and the right pressure plate (6) are provided with metal elastic sheets.

10. The bidirectional sealing ring for marine cryogenic butterfly valve as described in claim 1 or 2, characterized in that: The middle part of the non-metallic sealing ring (1) is provided with a wound metal elastic sheet.

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