Fluorine-lined corrosion-resistant butterfly valve

Abstract

The application relates to a fluorine-lined corrosion-resistant butterfly valve and relates to the field of valve devices, which comprises an integrated valve body, the inner cavity of the valve body is provided with a sealing convex ring in one piece, the inner cavity surface of the valve body and the outer surface of the sealing convex ring are both coated with a fluorine-lined coating through thermoplastic forming; a valve plate is fixedly installed on a valve rod in the valve body, a sealing ring is detachably connected to the valve plate, and the sealing ring is abutted between the sealing convex ring and the outer edge of the valve plate. The fluorine-lined coating is coated on the inner cavity surface of the valve body through thermoplastic forming, so that the displacement of the adhesion degree between the fluorine-lined plastic and the metal valve body can be reduced, the medium leakage caused by the displacement is avoided, and the butterfly valve is provided with good anticorrosion performance guarantee.

Description

Technical Field

[0001] This application relates to the field of valve devices, and more particularly to a fluoropolymer-lined corrosion-resistant butterfly valve. Background Technology

[0002] The main characteristic of PTFE-lined butterfly valves is that the valve body is lined with a plastic material (such as polytetrafluoroethylene, PTFE). Fluoroplastics possess extremely high chemical stability, resisting the erosion of most strong acids, strong alkalis, and other corrosive chemicals. This property makes PTFE-lined butterfly valves exhibit excellent corrosion resistance in industries such as chemical, pharmaceutical, and food processing, especially when handling corrosive media. Therefore, PTFE-lined butterfly valves can operate stably for extended periods in various corrosive environments, significantly extending their service life.

[0003] In existing technology, common fluoropolymer-lined butterfly valves consist of a split metal valve body with upper and lower sections and a molded fluoropolymer-lined plastic body. A rotating valve stem is rotatably mounted between the upper and lower valve bodies, and a butterfly plate is mounted on the rotating valve stem. A sealing ring is fixedly installed on the edge of the butterfly plate. A sealing protrusion ring is integrally formed in the inner cavity of the valve body. The valve stem is driven by a handwheel drive mechanism on the top of the valve body. Technicians can rotate the handwheel to rotate the butterfly plate, thus closing or opening the butterfly plate.

[0004] Due to the hardness of fluoropolymer-lined plastic, the valve body cannot be a single piece and must be a two-piece structure connected by bolts, nuts, and other fasteners. Because of this two-piece installation, the fit between the fluoropolymer-lined plastic and the metal valve body can shift, causing the fluoropolymer-lined plastic to leak outwards along the seam between the upper and lower valve bodies under high pressure during valve operation. Utility Model Content

[0005] In order to reduce the possibility of media leakage caused by displacement due to the adhesion between the fluoropolymer-lined plastic and the metal valve body, and to provide good corrosion resistance for the butterfly valve, this application provides a fluoropolymer-lined corrosion-resistant butterfly valve.

[0006] The fluoropolymer-lined corrosion-resistant butterfly valve provided in this application adopts the following technical solution:

[0007] A fluoropolymer-lined corrosion-resistant butterfly valve includes an integral valve body, wherein a sealing protrusion is integrally formed in the inner cavity of the valve body, and the inner surface of the valve body and the outer surface of the sealing protrusion are both thermoplastically coated with a fluoropolymer lining.

[0008] A butterfly plate is fixedly installed on the valve stem inside the valve body. A sealing ring is detachably connected to the butterfly plate, and the sealing ring is pressed between the sealing convex ring and the outer edge of the butterfly plate.

[0009] By adopting the above technical solution, a fluoropolymer lining is applied to the inner surface of the integrated valve body and the outer surface of the sealing ring through thermoplastic molding. This fluoropolymer lining enhances the valve body's corrosion resistance and prevents displacement of the separate valve body, which could lead to butterfly valve leakage. The detachable sealing ring on the butterfly plate facilitates easy replacement of the sealing ring by maintenance personnel, ensuring the sealing performance of the butterfly plate.

[0010] Preferably, the sealing ring includes a ring-shaped mounting portion, and the butterfly plate has a mounting ring groove along its edge near the sealing ring that is adapted to the mounting portion, and the mounting portion is embedded in the mounting ring groove;

[0011] The butterfly plate is detachably connected to a positioning ring by bolts on the side near the sealing convex ring, and the mounting part is pressed against the inner wall between the positioning ring and the mounting ring groove.

[0012] By adopting the above technical solution, the mounting groove can accommodate the mounting part on the sealing ring, and the positioning ring that can be detachably mounted on the butterfly plate can fix the mounting part of the sealing ring between the butterfly plate and the positioning ring, thus realizing the detachable installation of the sealing ring.

[0013] Preferably, the inner wall of the sealing ring is provided with a sealing surface with a conical surface, and the sealing surface is arranged in an inward shape along the direction away from the butterfly plate;

[0014] The outer edge of the butterfly plate and the outer edge of the positioning ring are jointly formed with an inclined conical surface parallel to the sealing surface. The sealing ring includes a sealing part, which is arranged in an inward shape along the direction away from the valve stem in the valve body, and the sealing part is coaxially sleeved on the outer edge of the butterfly plate and the positioning ring.

[0015] By adopting the above technical solution, the sealing surface on the conical surface of the sealing ring, the butterfly plate and the inclined conical surface on the positioning ring can extend the joint between the sealing part of the sealing ring and the sealing ring. At the same time, the inward inclination of the sealing surface, the inclined conical surface and the sealing part of the sealing ring can improve the sealing effect of the sealing ring.

[0016] Preferably, the edge of the positioning ring away from the valve stem is rounded.

[0017] By adopting the above technical solution, the rounded corners of the positioning ring can reduce the friction between the positioning ring and the sealing ring, thus reducing the risk of damage to the sealing ring.

[0018] Preferably, the butterfly plate has a plurality of mounting screw holes on the side away from the valve stem, and the plurality of mounting screw holes are evenly arranged in a circumferential array on the surface of the butterfly plate;

[0019] The positioning ring has several through holes for bolts to pass through. The through holes are evenly arranged in a circular array on the positioning ring, and each through hole is opposite to a mounting screw hole.

[0020] By adopting the above technical solution, and by setting the mounting screw holes and through holes, technicians can easily install the positioning ring on the side wall of the butterfly plate using bolts.

[0021] Preferably, the surface of the positioning ring is provided with a plurality of receiving grooves for accommodating the bolt parts, and the through holes are all located at the bottom of the receiving grooves.

[0022] By adopting the above technical solution, the bolt portion is accommodated by the receiving groove, which can prevent the bolt portion from being exposed on the surface of the positioning ring and effectively improve the surface flatness of the positioning ring.

[0023] In summary, the fluoropolymer-lined corrosion-resistant butterfly valve of this application has at least one of the following beneficial technical effects:

[0024] 1. By applying a fluoropolymer lining to the inner surface of the integrated valve body and the outer surface of the sealing ring through thermoplastic molding, the corrosion resistance of the valve body can be improved. At the same time, it can prevent the displacement of the split valve body due to the displacement of the fluoropolymer lining, which could lead to leakage of the butterfly valve.

[0025] 2. The detachable sealing ring on the butterfly plate facilitates subsequent maintenance personnel in disassembling the butterfly plate and replacing the sealing ring, thus ensuring the sealing performance of the butterfly plate. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating the overall structure of the valve body in an embodiment of this application.

[0027] Figure 2 This is a schematic diagram illustrating the internal structure of a butterfly valve in an embodiment of this application.

[0028] Figure 3 yes Figure 2 The enlarged diagram at point A is mainly used to show the positional relationship between the butterfly plate, the sealing ring, and the sealing convex ring.

[0029] Explanation of reference numerals in the attached drawings: 1. Valve body; 2. Sealing ring; 3. Fluorine lining coating; 4. Butterfly plate; 41. Mounting screw hole; 42. Mounting ring groove; 5. Sealing ring; 51. Mounting part; 52. Sealing part; 6. Valve stem; 7. Positioning ring; 71. Stem hole; 72. Receiving groove; 8. Bolt. Detailed Implementation

[0030] The following combination Figures 1-3 This application will be described in further detail.

[0031] Example

[0032] This application discloses a fluoropolymer-lined corrosion-resistant butterfly valve. (Refer to...) Figure 1 and Figure 2 The valve body 1 is an integrally formed valve body. The inner cavity of the valve body 1 is integrally formed with a sealing ring 2. The inner surface of the valve body 1 and the outer surface of the sealing ring 2 are both thermoplastic coated with a fluoropolymer lining 3. A butterfly plate 4 is fixedly installed on the valve stem 6 inside the valve body 1. A sealing ring 5 is detachably connected to the butterfly plate 4. The sealing ring 5 is pressed between the sealing ring 2 and the outer edge of the butterfly plate 4.

[0033] By applying a fluoropolymer-lined coating 3 to the inner surface of the integrated valve body 1 and the outer surface of the sealing ring 2 through thermoplastic molding, the corrosion resistance of the valve body 1 can be improved. Simultaneously, it prevents displacement of the separate valve body 1 due to the fluoropolymer lining, thus avoiding leakage of the butterfly valve. The detachable sealing ring 5 mounted on the butterfly plate 4 facilitates subsequent maintenance by allowing personnel to disassemble the butterfly plate 4 and replace the sealing ring 5, ensuring the sealing performance of the butterfly plate 4.

[0034] It should be noted that, in this embodiment, the process of thermoplastic coating with fluoropolymer lining is as follows: compressed air is used to spray plastic powder through the central pipe of the spray gun, and compressed air is sprayed around the plastic powder to form a curtain for cooling. At the outermost layer, the flame formed by the combustion gas heats the plastic powder to a molten state through the compressed air curtain, and the fluoropolymer lining coating 3 is deposited and leveled on the inner surface of the valve body 1.

[0035] Reference Figure 2 and Figure 3 The sealing ring 5 includes a ring-shaped mounting part 51. The butterfly plate 4 has a mounting ring groove 42 that matches the mounting part 51 along its edge on the side near the sealing protrusion ring 2. The mounting part 51 is embedded in the mounting ring groove 42. A positioning ring 7 is detachably connected to the side of the butterfly plate 4 near the sealing protrusion ring 2 by bolts 8. The mounting part 51 is pressed against the inner wall of the positioning ring 7 and the mounting ring groove 42.

[0036] The mounting groove 42 accommodates the mounting portion 51 on the sealing ring 5. The positioning ring 7, which is detachably mounted on the butterfly plate 4, fixes the mounting portion 51 of the sealing ring 5 between the butterfly plate 4 and the positioning ring 7, thus enabling the detachable installation of the sealing ring 5.

[0037] Reference Figure 3The inner wall of the sealing ring 2 is provided with a conical sealing surface, and the sealing surface is set inward in the direction away from the butterfly plate 4; the outer edge of the butterfly plate 4 and the outer edge of the positioning ring 7 are jointly formed with an inclined conical surface parallel to the sealing surface; the sealing ring 5 includes a sealing part 52, which is set inward in the direction away from the valve stem 6 inside the valve body 1, and the sealing part 52 is coaxially sleeved on the outer edge of the butterfly plate 4 and the positioning ring 7.

[0038] By setting the sealing surface on the conical surface of the sealing ring 2, and the inclined conical surface on the butterfly plate 4 and the positioning ring 7, the joint between the sealing part 52 of the sealing ring 5 and the sealing ring 2 can be extended. At the same time, the inward inclination of the sealing surface, the inclined conical surface, and the sealing part 52 of the sealing ring 5 can improve the sealing effect of the sealing ring 5.

[0039] In this embodiment, the edge of the positioning ring 7 furthest from the valve stem 6 is rounded. The rounded edge of the positioning ring 7 reduces the risk of damage to the sealing ring 2 due to friction between the positioning ring 7 and the sealing ring 2.

[0040] Reference Figure 3 The butterfly plate 4 has several mounting screw holes 41 on the side away from the valve stem 6. The mounting screw holes 41 are evenly arranged in a circular array on the surface of the butterfly plate 4. The positioning ring 7 has several through holes 71 for the rod part of the bolt 8 to pass through. The through holes 71 are evenly arranged in a circular array on the positioning ring 7, and the through holes 71 are respectively opposite to the mounting screw holes 41.

[0041] The installation screw hole 41 and the through hole 71 make it easy for technicians to install the positioning ring 7 on the side wall of the butterfly plate 4 using the bolt 8.

[0042] Reference Figure 3 The surface of the positioning ring 7 is provided with several receiving grooves 72 for accommodating the bolt portion of the bolt 8, and the through hole 71 is located at the bottom of the receiving groove 72. By accommodating the bolt portion of the bolt 8 through the receiving groove 72, the bolt portion of the bolt 8 is prevented from being exposed on the surface of the positioning ring 7, which can effectively improve the surface flatness of the positioning ring 7.

[0043] The implementation principle of a fluoropolymer-lined corrosion-resistant butterfly valve in this application embodiment is as follows: By applying a fluoropolymer-lined coating 3 to the inner surface of the integral valve body 1 and the outer surface of the sealing ring 2 through thermoplastic molding, the corrosion resistance of the valve body 1 is improved by the fluoropolymer-lined coating 3. Simultaneously, it prevents displacement of the separate valve body 1 due to the displacement of the fluoropolymer-lined plastic, thus avoiding leakage of the butterfly valve. The detachable sealing ring 5 installed on the butterfly plate 4 facilitates subsequent maintenance personnel to disassemble the butterfly plate 4 and replace the sealing ring 5, thereby ensuring the sealing performance of the butterfly plate 4.

[0044] 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 fluoropolymer-lined corrosion-resistant butterfly valve, characterized in that, The valve body (1) is an integral valve body. The inner cavity of the valve body (1) is integrally formed with a sealing ring (2). The inner surface of the valve body (1) and the outer surface of the sealing ring (2) are both thermoplastic coated with a fluoropolymer lining (3). A butterfly plate (4) is fixedly installed on the valve stem (6) inside the valve body (1). A sealing ring (5) is detachably connected to the butterfly plate (4). The sealing ring (5) is pressed between the sealing convex ring (2) and the outer edge of the butterfly plate (4).

2. The fluoropolymer-lined corrosion-resistant butterfly valve according to claim 1, characterized in that, The sealing ring (5) includes a ring-shaped mounting part (51). The butterfly plate (4) has a mounting ring groove (42) that matches the mounting part (51) along its edge on the side near the sealing convex ring (2). The mounting part (51) is embedded in the mounting ring groove (42). The butterfly plate (4) is detachably connected to a positioning ring (7) on the side near the sealing convex ring (2) by bolts (8), and the mounting part (51) abuts against the inner wall between the positioning ring (7) and the mounting ring groove (42).

3. The fluoropolymer-lined corrosion-resistant butterfly valve according to claim 2, characterized in that, The inner wall of the sealing ring (2) is provided with a sealing surface with a conical surface, and the sealing surface is arranged in an inward shape along the direction away from the butterfly plate (4); The outer edge of the butterfly plate (4) and the outer edge of the positioning ring (7) are together formed with an inclined conical surface parallel to the sealing surface. The sealing ring (5) includes a sealing part (52). The sealing part (52) is arranged in an inward shape along the direction away from the valve stem (6) inside the valve body (1), and the sealing part (52) is coaxially sleeved on the outer edge of the butterfly plate (4) and the positioning ring (7).

4. The fluoropolymer-lined corrosion-resistant butterfly valve according to claim 3, characterized in that, The positioning ring (7) has a rounded edge on the side away from the valve stem (6).

5. A fluoropolymer-lined corrosion-resistant butterfly valve according to claim 2, characterized in that, The butterfly plate (4) has a plurality of mounting screw holes (41) on the side away from the valve stem (6), and the plurality of mounting screw holes (41) are evenly arranged in a circular array on the surface of the butterfly plate (4). The positioning ring (7) has several through holes (71) through which the rods of the bolts (8) pass. The through holes (71) are evenly arranged in a circular array on the positioning ring (7), and the through holes (71) are respectively opposite to the mounting screw holes (41).

6. The fluoropolymer-lined corrosion-resistant butterfly valve according to claim 5, characterized in that, The surface of the positioning ring (7) is provided with several receiving grooves (72) for accommodating the bolt portion of the bolt (8), and the through hole (71) is located at the bottom of the receiving groove (72).

Images