A valve plate for a fluorine-lined large valve and a fluorine-lined large valve

Abstract

The utility model discloses a valve plate and fluorine lining big valve for fluorine lining big valve belong to valve anticorrosion technical field. The valve plate includes the butterfly plate that constitutes by the metal framework and the PFA lining layer that covers its outside, the PFA circular ring wave seal spare of fixed connection in butterfly plate edge and valve plate axle. The metal framework includes at least one metal ring and the metal support pole that is the rice character shape interlaced. The utility model discloses through lightweight framework structure solved the problem of traditional fluorine lining valve plate thick heavy, utilize PFA wave seal spare's elasticity with the valve seat that lined with PTFE forms " with softness overcome rigidity " sealed pair, has improved sealing performance and service life significantly, and makes valve plate easy to on -the -spot repair welding, has reduced maintenance cost greatly.

Description

Technical Field

[0001] This utility model relates to the field of valve corrosion protection technology, and in particular to a valve plate and a fluoropolymer-lined large valve. Background Technology

[0002] The quality of valves in chemical enterprises is crucial to industrial production. For conditions involving low-pressure media, large pipelines, and acidic or alkaline corrosion, fluoropolymer-lined large valves are required. The leak-free operation of these valves when closed is essential for safe and stable production. To address this, fluoropolymer-lined valve manufacturers have invested significant resources in researching and resolving leakage issues. However, due to various operating conditions and manufacturing limitations, achieving absolute leak-free operation is not always possible. The sealing performance of a valve is a vital indicator for evaluating its quality.

[0003] In industries such as chemical engineering, fluoropolymer-lined large valves are commonly used for large-diameter (e.g., DN500 and above), low-pressure, and highly corrosive media. Existing fluoropolymer-lined large valves typically have a solid metal valve plate, with a PFA or other fluoroplastic layer applied to the surface using an integral molding process to achieve corrosion resistance.

[0004] However, this traditional structure has obvious drawbacks: First, as the valve diameter increases, the solid valve plate becomes abnormally thick and heavy, leading to a sharp increase in valve manufacturing costs, drive torque, and user installation costs; second, its sealing relies on the rigid contact between the PTFE-lined valve plate plane and the PTFE-lined valve seat plane, which is a "hard-on-hard" seal, requiring extremely high machining accuracy and installation alignment. In actual operation, even slight wear or deformation can cause the sealing performance to decline rapidly; finally, once the valve plate lining or sealing surface is damaged, repair is extremely difficult, often requiring the entire valve plate to be removed and returned to the factory for remolding, resulting in high repair costs and long cycles, almost equivalent to manufacturing a new valve.

[0005] Therefore, there is an urgent need for a fluoropolymer-lined valve plate that combines lightweight design, excellent sealing performance, and maintainability. Utility Model Content

[0006] The purpose of this invention is to provide a valve plate and a fluoropolymer-lined large valve with better sealing performance and longer service life.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A valve plate for a fluoropolymer-lined large valve, comprising: A butterfly plate, the butterfly plate comprising at least one metal skeleton and a PFA (perfluoroalkoxyalkane) lining layer that completely covers the metal skeleton; A circular corrugated seal made of PFA material is fixedly connected to the edge of the butterfly plate to form a seal with the valve seat when the valve is closed. The valve plate shaft is fixedly connected to the metal frame located in the middle of the butterfly plate.

[0008] Furthermore, the metal frame includes at least one metal ring and several metal support rods, which are alternately connected to the metal ring.

[0009] Furthermore, the metal support rods are arranged in a star-shaped pattern on the metal ring.

[0010] Furthermore, the annular corrugated seal is manufactured by thermoplastic molding and welded to the edge of the disc using PFA welding material.

[0011] Furthermore, the annular corrugated seal comprises at least two wavy annular corrugated layers.

[0012] Furthermore, the PFA lining layer is coated onto the surface of the metal skeleton by a molding process.

[0013] Furthermore, the number of the metal rings and metal support rods increases accordingly as the valve diameter increases.

[0014] A fluoropolymer-lined large valve includes a valve body, a valve seat disposed within the valve body, and the valve plate described above.

[0015] Furthermore, the sealing surface of the valve seat is lined with a PTFE material layer.

[0016] This utility model of a PTFE-lined large valve consists of a metal ring and several metal support rods interlaced on the metal ring, arranged in a star-shaped pattern. The entire metal part is covered with a highly fusible and ductile PFA material to form a circular butterfly plate. A ring of PFA material, manufactured using a thermoplastic molding process, is welded to the edge of this circular butterfly plate. The ring of corrugated seals consists of at least two layers. When the PTFE-lined large valve is closed, the end of the corrugated seal is tightly connected to the valve seat of the valve body. Unlike conventional butterfly valves where a thick butterfly plate is tightly connected to the valve seat, this location is different. Both are relatively hard materials, making it difficult to achieve a proper seal, and the high friction can easily lead to wear on the sealing surfaces of the butterfly plate and valve seat, resulting in a decrease in valve sealing performance. Now, the PFA circular corrugated seal engages with the PTFE (polytetrafluoroethylene / Teflon) lined valve seat. Because the PFA circular corrugated seal has a certain degree of elasticity and compressibility, when the PTFE-lined valve is in the closed state, the PTFE-lined valve disc can deeply engage with the valve seat through the PFA circular corrugated seal, and the friction is relatively small. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the valve plate of this utility model; Figure 2 This is a cross-sectional view of the valve plate of this utility model; Figure 3 This is a schematic diagram of the valve plate and valve seat of this utility model. Detailed Implementation

[0018] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0019] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] See Figure 1-3 A valve plate for a fluoropolymer-lined large valve, comprising: The butterfly plate 10 includes at least one metal frame and a PFA liner 12 that completely covers the metal frame. The PFA material circular corrugated seal 20 is fixedly connected to the edge of the butterfly plate and is used to form a seal with the valve seat when the valve is closed. The valve plate shaft 30 is fixedly connected to the metal frame located in the middle of the butterfly plate 10.

[0022] In a preferred embodiment of the present invention, the metal frame includes at least one metal ring 11 and a plurality of metal support rods 13, the metal support rods being alternately connected to the metal ring. Specifically, the number of metal rings and metal support rods increases accordingly with the increase of valve diameter. In a preferred embodiment of this utility model, the metal support rods are arranged in a star-shaped pattern on the metal ring 11.

[0023] In a preferred embodiment of the present invention, the annular corrugated seal 20 is manufactured by thermoplastic molding and welded to the edge of the disc using PFA welding material; the annular corrugated seal 20 includes at least two wavy annular corrugated layers.

[0024] In a preferred embodiment of the present invention, the PFA lining layer 12 is coated onto the surface of the metal skeleton by a molding process.

[0025] A PTFE-lined large valve includes a valve body, a valve seat disposed within the valve body, and the aforementioned valve plate, wherein the sealing surface of the valve seat is lined with a PTFE material layer.

[0026] The PTFE-lined large valve plate consists of a large metal ring and metal support rods interlaced on the ring, with a central metal valve plate shaft and several support rods arranged in a star shape. The larger the valve diameter, the more metal rings and support rods are needed to ensure structural strength. All metal parts are covered with highly malleable PFA material to create a circular PFA-lined butterfly plate. The advantage of this design is that if the PFA lining detaches or is damaged, repairs can be made directly by welding.

[0027] A ring of PFA-lined bellows seals, manufactured using a thermoplastic molding process, is welded to the edge of the circular PFA-lined butterfly plate. This bellows seal has at least two layers of wavy corrugations. When the PTFE-lined valve is closed, the end of the bellows seal is tightly connected to the valve seat. Unlike conventional butterfly valves where a thick butterfly plate is tightly connected to the seat, this location is different. In conventional butterfly valves, both the butterfly plate and seat are relatively hard materials, making a tight seal difficult and resulting in high friction, which can easily lead to wear on the sealing surfaces of the butterfly plate and seat, reducing valve sealing performance. Instead, the PFA bellows seal engages with the PTFE-lined valve seat. Because the PFA bellows seal has a certain pressure buffering capacity, when the PTFE-lined valve is closed, the butterfly plate can deeply engage with the valve seat through the PFA bellows seal, resulting in relatively low friction and ensuring valve sealing performance.

[0028] When PFA is damaged, it can be prefabricated according to the shape of the damage, and then fixed by welding with PFA welding rod to complete the repair.

[0029] In summary, the application of the technical solution of this utility model has the following beneficial effects: 1. The valve sealing performance has been further enhanced, and the valve can still maintain a seal during long-term operation.

[0030] 2. The design of the metal ring and the metal support rods interlaced on the metal ring solves the problem of the heavy overall weight of conventional large-diameter valves caused by the thick valve plate. This innovative design also reduces the valve's operating torque accordingly.

[0031] 3. The PFA (Polypropylene) circular corrugated seal enhances and ensures valve sealing performance. Furthermore, when this area shows wear due to years of valve operation, a corrugated structure of fusible PFA can be fabricated based on the wear pattern, followed by repair welding using fusible PFA welding rods. Conventional fluoropolymer-lined large valves, where the PFA lining is directly molded onto the valve plate, cannot resolve the sealing performance at the fully closed position if wear occurs at the valve plate where it engages with the valve seat. The entire valve plate must be disassembled for complete repair, resulting in significantly higher maintenance costs.

[0032] 4. This technological innovation reduces valve damage rates and maintenance costs. The various valve components exhibit enhanced durability and corrosion resistance, significantly lowering the damage rate. Valve maintenance becomes simpler and faster, reducing maintenance expenses.

[0033] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0034] 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 valve plate for a fluoropolymer-lined large valve, characterized in that, include: A butterfly plate, the butterfly plate comprising at least one metal frame and a PFA liner layer completely covering the metal frame; A circular corrugated seal made of PFA material is fixedly connected to the edge of the butterfly plate to form a seal with the valve seat when the valve is closed. The valve plate shaft is fixedly connected to the metal frame located in the middle of the butterfly plate.

2. The valve plate of the fluoropolymer-lined large valve as described in claim 1, characterized in that: The metal frame includes at least one metal ring and several metal support rods, which are connected alternately to the metal ring.

3. The valve plate of the fluoropolymer-lined large valve as described in claim 2, characterized in that: The metal support rods are arranged in a star-shaped pattern on the metal ring.

4. The valve plate of the fluoropolymer-lined large valve as described in claim 1, characterized in that: The annular corrugated seal is manufactured by thermoplastic molding and welded to the edge of the butterfly plate using PFA welding material.

5. The valve plate of the fluoropolymer-lined large valve as described in claim 4, characterized in that: The annular corrugated seal comprises at least two wavy annular corrugated layers.

6. The valve plate of the fluoropolymer-lined large valve as described in claim 1, characterized in that: The PFA lining layer is applied to the surface of the metal skeleton by a molding process.

7. The valve plate of the fluoropolymer-lined large valve as described in claim 1, characterized in that: The number of metal rings and metal support rods increases accordingly as the valve diameter increases.

8. A fluoropolymer-lined large valve, characterized in that: It includes a valve body, a valve seat disposed within the valve body, and a valve plate as described in any one of claims 1 to 7.

9. A fluoropolymer-lined large valve according to claim 8, characterized in that: The sealing surface of the valve seat is lined with a PTFE material layer.

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