Metal hard sealing butterfly valve with high corrosion resistance

Abstract

The utility model relates to butterfly valve technical field, and disclose a kind of metal hard sealing butterfly valve of high anticorrosive property, including butterfly valve, butterfly valve includes butterfly plate, valve body and valve shaft, valve shaft is arranged in the inside center of valve body, valve shaft includes upper valve shaft and lower valve shaft, upper valve shaft and lower valve shaft are respectively located the upside and downside of butterfly plate and are connected with butterfly plate;The both ends of valve body are equipped with sealing flange, the inside of valve body forms inner chamber, the inner wall of inner chamber and flange sealing surface are covered with a layer of valve body metal film, the outer surface of butterfly plate is covered with a layer of butterfly plate metal film.The utility model is added in the inner surface of butterfly valve valve cavity and the outer surface of butterfly plate one layer of metal protective film, ensure that all the part of butterfly valve inner chamber and the outer surface of butterfly plate with medium contact realizes excellent anticorrosive effect, to significantly improve the internal corrosion resistance of butterfly valve product.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a metal hard-seal butterfly valve with high corrosion resistance. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a type of valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing.

[0003] Currently, a common problem with butterfly valves produced in my country is the relatively lagging development of anti-corrosion processes for the inner surface of the valve cavity and the outer surface of the butterfly plate. Specifically, the use of traditional processes such as rubber coating, painting, and powder coating results in complex anti-corrosion layer processes on the inner surface of the valve cavity and the outer surface of the butterfly plate, or the anti-corrosion layer is prone to peeling off, thus affecting the anti-corrosion effect and making it difficult to achieve the ideal state.

[0004] The existing anti-corrosion process for the inner cavity of butterfly valve products has the following problems: (1) When the inner surface of the valve cavity and the outer surface of the butterfly plate of the butterfly valve are coated with rubber, the process is not only complicated and the mold cost is high, but also has defects such as insufficient wear resistance and poor temperature resistance after coating.

[0005] (2) When the inner surface of the valve cavity and the outer surface of the butterfly plate of the butterfly valve are painted, the paint adhesion is insufficient, which can easily lead to paint peeling or poor durability. This will cause the anti-corrosion performance of the inner surface of the valve cavity and the outer surface of the butterfly plate to fail, resulting in serious corrosion in the valve cavity and pollution. Moreover, the painting process seriously pollutes the environment.

[0006] (3) When the inner surface of the valve cavity and the outer surface of the butterfly plate of the butterfly valve are coated with powder coating, the process also faces the problem of insufficient adhesion of the plastic surface, which leads to the peeling of the plastic surface or poor durability, thereby causing the corrosion resistance of the inner surface of the valve cavity and the outer surface of the butterfly plate to fail, resulting in serious corrosion of the valve body cavity and causing pollution.

[0007] Therefore, those skilled in the art urgently need to develop a metal hard-seal butterfly valve with high corrosion resistance. Utility Model Content

[0008] The purpose of this invention is to address the shortcomings of existing technologies by proposing a metal hard-seal butterfly valve with high corrosion resistance.

[0009] To achieve the above objectives, the present invention adopts the following technical solution: a metal hard-seal butterfly valve with high corrosion resistance, comprising a butterfly valve, the butterfly valve comprising a butterfly plate, a valve body and a valve shaft, the valve shaft being disposed at the internal center of the valve body, the valve shaft comprising an upper valve shaft and a lower valve shaft, the upper valve shaft and the lower valve shaft being located on the upper and lower sides of the butterfly plate respectively and connected to the butterfly plate; Both ends of the valve body are provided with sealing flanges, and the inside of the valve body forms an inner cavity. The inner wall of the inner cavity and the flange sealing surface are covered with a layer of valve body metal film, and the outer surface of the butterfly plate is covered with a layer of butterfly plate metal film.

[0010] Preferably, a YX-type rubber sealing ring is provided at the connection between the upper valve shaft, the lower valve shaft and the valve body. The YX-type rubber sealing ring is located in the inner cavity of the valve body. The butterfly valve also includes a bushing, which is respectively sleeved on the upper valve shaft and the lower valve shaft. The bushing on the upper valve shaft is located below the YX-type rubber sealing ring, and the bushing on the lower valve shaft is located above the YX-type rubber sealing ring.

[0011] Preferably, the bushing is a self-lubricating bushing.

[0012] Preferably, the upper end of the upper valve shaft is connected to the sealing gland by a cylindrical head hexagonal screw.

[0013] Preferably, O-rings are provided at the mating points of the upper valve shaft, the lower valve shaft and the inner cavity of the valve body shaft hole.

[0014] Preferably, the thickness of both the butterfly plate metal film and the valve body metal film is greater than 0.5 mm, and the material of both the butterfly plate metal film and the valve body metal film is one of stainless steel, titanium alloy, Monel alloy, Stellite alloy, Hastelloy alloy, aluminum alloy, and copper alloy.

[0015] Compared with the prior art, the beneficial effects of this utility model are: This technology adds a metal protective film to the inner surface of the butterfly valve cavity and the outer surface of the butterfly plate. This metal protective film can be made of metal materials with high corrosion resistance, such as stainless steel, titanium alloy, Monel alloy, Stellite alloy, Hastelloy alloy, aluminum alloy, and copper alloy. This ensures that all parts of the butterfly valve cavity and the outer surface of the butterfly plate that come into contact with the medium achieve excellent anti-corrosion effect, thereby significantly improving the internal anti-corrosion performance of the butterfly valve product. Attached Figure Description

[0016] Figure 1 This is a front structural sectional view of the present invention; Figure 2 for Figure 1 Enlarged view of the structure at point A in the middle.

[0017] In the diagram: 1-Butterfly plate; 2-Butterfly plate metal diaphragm; 3-Valve body metal diaphragm; 4-Valve body; 5-O-ring seal; 6-Upper valve shaft; 7-Sleeve; 8-Y-ring seal; 9-Sealing gland; 10-Cylindrical head socket head cap screw; 11-Lower valve shaft. Detailed Implementation

[0018] The present invention will now be clearly described with reference to the accompanying drawings and specific embodiments. This description is merely for explaining the present invention and is not intended to limit it. Any modifications, equivalent substitutions, improvements, etc., made by those skilled in the art based on the embodiments of the present invention without inventive effort to obtain all other embodiments should be included within the protection scope of the present invention.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] 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.

[0021] Please see Figures 1-2 This utility model provides an embodiment: a metal hard-seal butterfly valve with high corrosion resistance, including a butterfly valve, which includes a butterfly plate 1, a valve body 4 and a valve shaft. The valve shaft is located at the internal center of the valve body 4 and includes an upper valve shaft 6 and a lower valve shaft 11. The upper valve shaft 6 and the lower valve shaft 11 are respectively located on the upper and lower sides of the butterfly plate 1 and are connected to the butterfly plate 1. Flanges are provided at both ends of the valve body 4. The flange faces at both ends of the valve body 4 are flange sealing faces. An inner cavity is formed inside the valve body 4. The inner wall of the inner cavity and the flange sealing face are covered with a layer of valve body metal film 3. The outer surface of the butterfly plate 1 is covered with a layer of butterfly plate metal film 2.

[0022] The metal protective film on the inner wall of the valve body 4 and the metal protective film on the outer surface of the butterfly plate 1 are bonded and fixed by applying metal adhesive; the metal protective film on the butterfly plate 1 and the metal protective film on the inner wall of the valve body 4 are tightly bonded to the butterfly plate 1 and to the valve body 4, thereby achieving a good anti-corrosion effect.

[0023] Furthermore, YX-type rubber sealing rings 8 are provided at the connection points between the upper valve shaft 6, the lower valve shaft 11 and the valve body 4. The YX-type rubber sealing rings 8 are located in the inner cavity of the valve body 4. The butterfly valve also includes a bushing 7, which is sleeved on the upper valve shaft 6 and the lower valve shaft 11 respectively. The bushing 7 on the upper valve shaft 6 is located below the YX-type rubber sealing ring 8, and the bushing 7 on the lower valve shaft 11 is located above the YX-type rubber sealing ring 8. The bushing 7 is a self-lubricating bushing.

[0024] 1. Corrosion protection measures for butterfly valve body: After the metal protective film is applied, it adheres tightly to the inner wall of the valve body and the flange sealing surface, significantly improving the wear resistance and corrosion resistance of the valve cavity.

[0025] 2. Corrosion protection measures for butterfly valve discs: After the adhesive is applied, the metal protective film adheres tightly to the outer surface of the disc, forming a solid metal protective layer that significantly enhances its wear resistance and corrosion resistance.

[0026] Furthermore, the upper end of the upper valve shaft 6 is connected to the sealing gland 9 via a cylindrical head hexagonal screw 10.

[0027] Furthermore, O-ring rubber seals 5 are provided at the mating points of the upper valve shaft 6, the lower valve shaft 11 and the shaft hole inner cavity of the valve body 4.

[0028] Furthermore, the thickness of both the butterfly plate metal diaphragm 2 and the valve body metal diaphragm 3 is greater than 0.5 mm, and the material of both the butterfly plate metal diaphragm 2 and the valve body metal diaphragm 3 is one of stainless steel, titanium alloy, Monel alloy, Stellite alloy, Hastelloy alloy, aluminum alloy, and copper alloy. This highly corrosion-resistant metal material ensures excellent corrosion resistance for all parts of the butterfly valve's inner cavity and the outer surface of the butterfly plate that come into contact with the medium, thereby significantly improving the internal corrosion resistance of the butterfly valve product.

[0029] The material of the metal protective film can be selected according to the corrosiveness of the medium. For example, when treating tap water and sewage, a metal protective film made of stainless steel such as 304 or 316 can be used; in chemical industry applications, a metal protective film made of special alloy materials with high corrosion resistance, such as titanium alloy (TA), Stellite, Monel, and Hastelloy, can be selected; if applied to seawater environments, an aluminum bronze metal protective film is the ideal choice.

[0030] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-corrosion-resistant metal hard-seal butterfly valve, comprising a butterfly valve, characterized in that: The butterfly valve includes a butterfly plate, a valve body, and a valve shaft. The valve shaft is located at the internal center of the valve body and includes an upper valve shaft and a lower valve shaft. The upper valve shaft and the lower valve shaft are located on the upper and lower sides of the butterfly plate, respectively, and are connected to the butterfly plate. Both ends of the valve body are provided with sealing flanges, and the inside of the valve body forms an inner cavity. The inner wall of the inner cavity and the flange sealing surface are covered with a layer of valve body metal film, and the outer surface of the butterfly plate is covered with a layer of butterfly plate metal film.

2. The high corrosion resistance metal hard-seal butterfly valve according to claim 1, characterized in that: YX-type rubber sealing rings are provided at the connection points between the upper valve shaft, the lower valve shaft and the valve body. The YX-type rubber sealing rings are located in the inner cavity of the valve body. The butterfly valve also includes bushings, which are respectively sleeved on the upper valve shaft and the lower valve shaft. The bushing on the upper valve shaft is located below the YX-type rubber sealing ring, and the bushing on the lower valve shaft is located above the YX-type rubber sealing ring.

3. The high corrosion resistance metal hard-seal butterfly valve according to claim 2, characterized in that: The bushing is a self-lubricating bushing.

4. The high corrosion resistance metal hard-seal butterfly valve according to claim 1, characterized in that: The upper end of the upper valve shaft is connected to the sealing gland by a cylindrical head hexagonal screw.

5. A high-corrosion-resistant metal hard-seal butterfly valve according to claim 1, characterized in that: O-rings are provided at the mating points of the upper and lower valve shafts with the inner cavity of the valve body shaft hole.

6. The high corrosion resistance metal hard-seal butterfly valve according to claim 1, characterized in that: The thickness of both the butterfly plate metal membrane and the valve body metal membrane is greater than 0.5 mm, and the material of both the butterfly plate metal membrane and the valve body metal membrane is one of stainless steel, titanium alloy, Monel alloy, Stellite alloy, Hastelloy alloy, aluminum alloy, and copper alloy.

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