Corrosion-resistant valve casting

Abstract

The utility model relates to a corrosion-resistant valve casting in the technical field of valve castings, which comprises a valve casting body and is characterized in that a connecting piece is arranged on the valve casting body, flange plates are arranged at two ends of the valve casting body, and a first internal coating is coated inside the valve casting body. The enhanced particles are arranged in the first primer layer and the second primer layer, so that the roughness of the primer is increased, the mechanical meshing force between the primer and the interior of the valve casting is improved, the first primer layer and the second primer layer are better kept on the surface of the casting, the scraping resistance is improved, and the durability of the coating is enhanced; the lubricating layer is arranged in the connecting piece, so that other components on the connecting piece are convenient to mount and dismount, the problems that a coating of a traditional valve casting is easy to fall off, the connecting piece is easy to wear and the overall corrosion resistance is insufficient are effectively solved, the reliability of the valve casting under various complex working conditions is greatly improved, and the service life of the valve casting under various complex working conditions is greatly prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve casting technical field especially relates to a kind of corrosion-resistant valve castings. BACKGROUND

[0002] The traditional valve casting, due to its casting process characteristics, the surface is rough and there are tiny pores. In actual use, when the valve contacts various corrosive liquid media, these liquids will continuously impact the internal coating of the valve casting during flow. The rough casting surface makes it difficult for the coating to adhere tightly, and as the number of impacts increases, the adhesion of the coating decreases sharply, and phenomena such as coating folding and peeling occur. Not only does this destroy the original protective system of the valve casting, resulting in a significant reduction in its corrosion resistance, but it also fails to effectively resist the erosion of acid-base components and oxidizing substances in the medium, and it can also directly expose the casting substrate to harsh environments, accelerating the corrosion process and shortening the service life of the valve. In addition, during frequent opening and closing operations of the valve, the connecting part lacks effective lubrication design and can generate a large amount of friction with other cooperating components, which not only increases the operating resistance and affects the opening and closing efficiency of the valve, but also further damages the coating and increases the risk of coating peeling, forming a vicious cycle and causing many hidden dangers to the continuity and safety of industrial production. SUMMARY

[0003] The utility model aims at solving the shortcomings in the prior art and provides a corrosion-resistant valve casting.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a corrosion-resistant valve casting, comprising a valve casting body, a connecting piece is arranged on the valve casting body, flanges are arranged at both ends of the valve casting body, a first internal coating is coated on the inside of the valve casting body, a second internal coating is coated on the inside of the connecting piece, an external coating is coated on the outside of the valve casting body and the connecting piece, the first internal coating comprises a first primer layer, a first filler layer and a first corrosion-resistant layer from inside to outside of the valve casting body, the second internal coating comprises a second primer layer, a second filler layer, a second corrosion-resistant layer and a lubricating layer from inside to outside of the valve casting body, the external coating comprises a third primer layer, an external filler layer and an external corrosion-resistant layer from outside to inside of the valve casting body, and the first primer layer and the second primer layer are provided with reinforcing particles.

[0005] Further description of the above technical scheme:

[0006] The valve casting body, the connecting piece and the flanges are made by integral casting.

[0007] Further description of the above technical scheme:

[0008] The flange plate is provided with mounting holes, six mounting holes are arranged in a circular array on the flange plate.

[0009] As a further description of the above technical solution:

[0010] The first primer layer and the second primer layer are epoxy primer, and the first filling layer and the second filling layer are epoxy cloud iron intermediate paint.

[0011] As a further description of the above technical solution:

[0012] The first anticorrosive layer and the second anticorrosive layer are fluorocarbon anticorrosive paint, and the lubricating layer is molybdenum disulfide lubricating material.

[0013] As a further description of the above technical solution:

[0014] The third primer layer is zinc-rich primer, the external filling layer is acrylic filling paint, and the external anticorrosive layer is epoxy phenolic anticorrosive paint.

[0015] As a further description of the above technical solution:

[0016] The reinforcing particles are silica fillers.

[0017] The utility model discloses have the following beneficial effects: through setting up reinforcing particles in first primer layer and second primer layer, thereby increase the roughness of primer, thereby improve the mechanical bite of primer and valve casting internal, thereby make first primer layer and second primer layer better keep on the casting surface improvement, anti -scratch performance, enhance the durability of coating, through setting up lubricating layer in the inside of connecting piece, the installation and dismounting of other components on connecting piece are convenient, effectively solved the traditional valve casting coating easy to fall off, connecting piece easy to wear and the problem of insufficient overall corrosion resistance, greatly promote the reliability and service life of valve casting under various complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure diagram of the corrosion-resistant valve casting is provided for the utility model;

[0019] Figure 2 A sectional structure diagram of the valve casting body and the first internal coating of the corrosion-resistant valve casting is provided for the utility model;

[0020] Figure 3 A sectional structure diagram of the valve casting body and the second internal coating of the corrosion-resistant valve casting is provided for the utility model;

[0021] Figure 4 A sectional structure diagram of the valve casting body and the external coating of the corrosion-resistant valve casting is provided for the utility model.

[0022] Legend:

[0023] 1, valve casting body; 2, connecting piece; 3, flange plate; 4, first internal coating; 5, second internal coating; 6, external coating; 7, reinforcing particles; 31, mounting hole; 41, first primer layer; 42, first filling layer; 43, first corrosion-resistant layer; 51, second primer layer; 52, second filling layer; 53, second corrosion-resistant layer; 54, lubricating layer; 61, third primer layer; 62, external filling layer; 63, external corrosion-resistant layer. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0025] Reference Figures 1-4 , the utility model provides an embodiment: a kind of corrosion-resistant valve casting, including valve casting body 1, connecting piece 2 is provided on valve casting body 1, flange plate 3 is provided at the both ends of valve casting body 1, the inside of valve casting body 1 is coated with first internal coating 4, the inside of connecting piece 2 is coated with second internal coating 5, the outside of valve casting body 1 and connecting piece 2 is coated with external coating 6, first internal coating 4 includes first primer layer 41, first filling layer 42, first corrosion-resistant layer 43 by valve casting body 1 inward, second internal coating 5 includes second primer layer 51, second filling layer 52, second corrosion-resistant layer 53 and lubricating layer 54 by valve casting body 1 inward, external coating 6 includes third primer layer 61, external filling layer 62 and external corrosion-resistant layer 63 by valve casting body 1 outward, first primer layer 41 and second primer layer 51 are provided with reinforcing particles 7.

[0026] Valve casting body 1, connecting piece 2 and flange plate 3 are made by integral casting, and the integrated structure design greatly enhances the integrity and mechanical strength of the entire valve casting, effectively reduces the stress concentration problem caused by structural differences at the connection, avoids the risk of cracks or fractures under high pressure and high load conditions, and ensures long-term stable operation of the valve.

[0027] Flange plate 3 is provided with mounting hole 31, mounting hole 31 is six, mounting hole 31 is arranged in circumferential array on flange plate 3, and uniformly distributed mounting hole 31 can balance the stress of valve when connected with pipeline system, guarantee the tightness and sealing of connection, prevent medium leakage caused by uneven stress, and provide reliable guarantee for industrial fluid conveying.

[0028] The first primer layer 41 and the second primer layer 51 are epoxy primer, which has good adhesion, water resistance and chemical stability, and can form a tough initial protective film on the surface of the casting to provide a stable foundation for the subsequent coating; the first filling layer 42 and the second filling layer 52 are epoxy micaceous iron oxide intermediate paint, which can effectively fill the fine pores on the surface of the primer layer, further improve the density of the coating, and also has good shielding effect to block the invasion of external corrosive media.

[0029] The first anticorrosive layer 43 and the second anticorrosive layer 53 are fluorocarbon anticorrosive paint, which has strong weather resistance, corrosion resistance and chemical inertness, and can provide long-term corrosion protection for the internal of the valve casting; the lubricating layer 54 is molybdenum disulfide lubricating material, which has extremely low friction coefficient and can significantly reduce the friction during the frequent friction of the connecting piece 2 and other components, thereby facilitating installation and removal, reducing coating wear caused by friction, and prolonging the service life of the connecting piece 2.

[0030] The third primer layer 61 is zinc-rich primer, and zinc powder in the coating can play an electrochemical protection role, so that when the coating is locally damaged, the zinc powder will corrode preferentially to protect the valve casting substrate from corrosion; the external filling layer 62 is an acrylic filling paint, which can effectively fill the macroscopic defects on the surface of the casting, improve the appearance flatness, and enhance the bonding force between the coating and the substrate; the external anticorrosive layer 63 is an epoxy phenolic anticorrosive paint, which combines the advantages of epoxy resin and phenolic resin, has excellent acid resistance, alkali resistance and heat resistance, and provides a solid barrier for the valve casting to resist complex and harsh external environments.

[0031] The reinforcing particles 7 are silica fillers, which have high hardness and can significantly increase the roughness of the primer after being uniformly dispersed in the primer, so as to form more mechanical interlocking points between the primer and the internal surface of the valve casting, greatly improve the adhesion of the primer, and effectively improve the overall scratch resistance of the coating. Even if the coating is subjected to external object impact and washing, the coating is not easy to fall off, which effectively guarantees the durability of the valve casting coating system and prolongs the service period of the valve under harsh working conditions.

[0032] Working principle: The corrosion-resistant valve casting of the utility model is composed of a valve casting body 1, a connecting piece 2 and a flange plate 3, and has the characteristics of corrosion resistance, long service life and reliable operation through the first internal coating 4, the second internal coating 5, the external coating 6 and the reinforcing particles 7.

[0033] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and is not intended to limit the present application, although the foregoing embodiments of the present application has been described in detail, for the skilled in the art, it still can be modified, or for part of the technical features of the equivalent replacement, the spirit and principles of the present application, made any modification, equivalent replacement, improvement, etc., should be included within the scope of the present application.

Claims

1. A corrosion resistant valve casting comprising a valve casting body (1), characterized in that: The valve casting body (1) is provided with a connecting piece (2), both ends of the valve casting body (1) are provided with flanges (3), the inside of the valve casting body (1) is coated with a first internal coating (4), the inside of the connecting piece (2) is coated with a second internal coating (5), the outside of the valve casting body (1) and the connecting piece (2) is coated with an external coating (6), the first internal coating (4) comprises a first primer layer (41), a first filling layer (42) and a first anticorrosive layer (43) from inside to outside of the valve casting body (1), the second internal coating (5) comprises a second primer layer (51), a second filling layer (52), a second anticorrosive layer (53) and a lubricating layer (54) from inside to outside of the valve casting body (1), the external coating (6) comprises a third primer layer (61), an external filling layer (62) and an external anticorrosive layer (63) from outside to inside of the valve casting body (1), and the first primer layer (41) and the second primer layer (51) are provided with reinforcing particles (7).

2. A corrosion resistant valve casting according to claim 1, characterized in that: The valve casting body (1), the connecting piece (2) and the flange (3) are made by integral casting.

3. A corrosion resistant valve casting according to claim 2, wherein: The flange (3) is provided with mounting holes (31), six mounting holes (31) are arranged in a circular array on the flange (3).

4. A corrosion resistant valve casting according to claim 3, wherein: The first primer layer (41) and the second primer layer (51) are epoxy primer, the first filling layer (42) and the second filling layer (52) are epoxy cloud iron intermediate paint.

5. A corrosion resistant valve casting according to claim 4, wherein: The first anticorrosive layer (43) and the second anticorrosive layer (53) are fluorocarbon anticorrosive paint, and the lubricating layer (54) is molybdenum disulfide lubricating material.

6. A corrosion resistant valve casting according to claim 5, wherein: The third primer layer (61) is zinc-rich primer, the external filling layer (62) is acrylic filling paint, and the external anticorrosive layer (63) is epoxy phenolic anticorrosive paint.

7. A corrosion resistant valve casting according to claim 6, wherein: The reinforcing particles (7) are silica fillers.

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