High-pressure-resistant and corrosion-resistant valve body casting

Abstract

The utility model provides a kind of high-pressure-resistant corrosion-resistant valve body casting, including valve body casting shell, the upper surface of valve body casting shell is provided with connecting end, the upper of connecting end is equipped with sealing end cover, the upper of sealing end cover is equipped with thread locking cover, the inner ring of thread locking cover is connected with the outer surface of connecting end by screw thread, the bottom surface of sealing end cover is equipped with annular recess, it is related to valve body casting field.The utility model can resist high pressure by first sealing ring as rigid sealing layer, and the flexibility of second sealing ring can effectively make up the sealing defect due to material performance fluctuation, in addition, the rigid sealing layer formed by first sealing ring and the flexible filling of second sealing ring can further isolate corrosive medium, prevent it from penetrating through defect, and by the cooperation of thread locking cover and connecting end, sealing end cover can be quickly installed and disassembled.

Description

Technical Field

[0001] This utility model relates to the field of valve body castings, specifically a high-pressure and corrosion-resistant valve body casting. Background Technology

[0002] Valve body castings are the main components of valves produced using casting technology. They are made by injecting liquid metal into a pre-designed mold cavity, allowing the metal to cool and solidify, and then cleaning and machining them to obtain castings with specific shapes and sizes. Valve body castings play a key role in fluid control systems, used to control the direction, pressure, and flow of fluids, such as high-pressure cast valve bodies used in oilfield production.

[0003] The valve body casting needs to be fitted with a drive assembly at the end, and then sealed with a sealing end cap. However, the current sealing end cap has poor high-pressure sealing performance when connected to the end of the valve body casting, and leakage is prone to occur under high pressure. The leaked medium can easily cause corrosion damage to the valve body casting and affect the fluid control of oilfield production. Therefore, we propose a high-pressure and corrosion-resistant valve body casting to solve the above problems. Utility Model Content

[0004] The purpose of this utility model is to provide a high-pressure and corrosion-resistant valve body casting to solve the problems mentioned in the background art and overcome its technical defects.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: a high-pressure and corrosion-resistant valve body casting, including a valve body casting shell, a connecting end provided on the upper surface of the valve body casting shell, a sealing end cover provided above the connecting end, a threaded locking cover provided above the sealing end cover, the inner ring of the threaded locking cover being threadedly connected to the outer surface of the connecting end, an annular concave hole provided on the bottom surface of the sealing end cover, a first sealing ring and a second sealing ring being fixedly connected to the upper surface of the connecting end, the outer surface of the first sealing ring being in contact with the inner wall of the annular concave hole, and a high-pressure resistant valve plate sealing ring being fixedly connected to the inner wall of the valve body casting shell.

[0006] As a further improvement of this utility model: both the left and right ends of the valve body casting shell are provided with flange connection parts, both flange connection parts are provided with multiple connection holes, and both flange connection parts are provided with annular grooves on the side that is far apart from each other.

[0007] As a further improvement of this utility model: a buffer washer is fitted on the upper surface of the sealing end cap, and the upper surface of the buffer washer is in close contact with the upper surface of the threaded locking cover.

[0008] As a further improvement of this utility model: the inner ring of the connecting end is provided with an annular hole, and a hexagonal rotating plate is fixedly connected to the outer surface of the threaded locking cover.

[0009] As a further improvement of this utility model: channels are provided at both ends of the valve body casting shell, and the ends of the two channels that are far apart from each other are respectively connected to the ends of the two flange connection parts that are close to each other.

[0010] As a further improvement of this utility model: the first sealing ring is a metal circular ring, and the second sealing ring is an elastomeric sealing ring.

[0011] Compared with the prior art, the beneficial effects of this utility model include: the first sealing ring acts as a rigid sealing layer, which can withstand high pressure by its own structural design; the flexible supplement of the second sealing ring can effectively compensate for sealing defects caused by fluctuations in material properties, ensuring the sealing performance of the valve body casting shell under high pressure. In addition, the rigid sealing layer formed by the first sealing ring and the flexible filling of the second sealing ring can further isolate corrosive media, prevent them from penetrating through defects, slow down the corrosion process, improve the overall sealing performance and service life of the valve body, and through the cooperation of the threaded locking cover and the connecting end, the sealing end cover can be quickly installed and disassembled, improving the sealing effect during disassembly and assembly. Attached Figure Description

[0012] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein: Figure 1 The schematic diagram shows a frontal perspective view of a three-dimensional structure according to one embodiment of the present invention; Figure 2 The schematic diagram shows a front sectional view according to one embodiment of the present invention; Figure 3 The diagram schematically shows an exploded view of the valve body casting shell and sealing end cap according to one embodiment of the present invention. Figure 4 The illustration schematically shows a method proposed according to one embodiment of the present invention. Figure 2 Enlarged schematic diagram of the structure at point A in the middle; The following are the labels in the diagram: 1. Valve body casting shell; 2. Connecting end; 3. Threaded locking cover; 4. Sealing end cover; 5. Annular hole; 6. High-pressure resistant valve plate sealing ring; 7. Connecting hole; 8. First sealing ring; 9. Annular recessed hole; 10. Second sealing ring; 11. Buffer gasket; 12. Hexagonal rotating plate; 13. Channel; 14. Flange connection; 15. Annular groove. Detailed Implementation

[0013] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0014] According to one embodiment of the present invention, in conjunction with the appended drawings Figure 1-4 As shown.

[0015] A high-pressure and corrosion-resistant valve body casting includes a valve body casting shell 1, which is made of high-strength stainless steel. The inner wall and surface of the valve body casting shell 1 are provided with a corrosion-resistant layer to resist the erosion of corrosive media. The upper surface of the valve body casting shell 1 is provided with a connecting end 2, and a sealing end cap 4 is provided above the connecting end 2. A threaded locking cover 3 is provided above the sealing end cap 4. The inner ring of the threaded locking cover 3 is threadedly connected to the outer surface of the connecting end 2. An annular recess 9 is opened on the bottom surface of the sealing end cap 4. A first sealing ring 8 and a second sealing ring 10 are fixedly connected to the upper surface of the connecting end 2 respectively. The outer surface of the first sealing ring 8 is in contact with the inner wall of the annular recess 9. A high-pressure resistant valve plate sealing ring 6 is fixedly connected to the inner wall of the valve body casting shell 1. The high-pressure resistant valve plate sealing ring 6 includes a composite structure layer. The inner layer is a metal skeleton layer made of high-strength stainless steel to provide structural support and deformation resistance. The outer layer is a corrosion-resistant coating layer made of Hastelloy or sprayed ceramic coating to resist the erosion of corrosive media.

[0016] In this example, flange connection parts 14 are provided at both the left and right ends of the valve body casting shell 1. Each flange connection part 14 has multiple connection holes 7. An annular groove 15 is provided on the side of the two flange connection parts 14 that is far apart from each other. Channels 13 are provided at both the left and right ends of the two channels 13 that are far apart from each other and are respectively connected to the side of the two flange connection parts 14 that are close to each other. Through the flange connection parts 14 and the connection holes 7, it can be connected and installed with the pipeline. A metal spiral wound gasket is installed in the annular groove 15. The metal spiral wound gasket is made of V-shaped or W-shaped stainless steel strip and flexible graphite strip wrapped alternately, which can enhance the sealing effect during connection.

[0017] In this example, a buffer washer 11 is fitted on the upper surface of the sealing end cover 4. The upper surface of the buffer washer 11 is in close contact with the upper surface of the threaded locking cover 3. An annular hole 5 is opened in the inner ring of the connecting end 2. A self-tightening sealing ring made of Inconel alloy is installed in the annular hole 5. When the pressure inside the valve body casting shell 1 increases, the self-tightening sealing ring expands outward under the action of the medium pressure, forming a self-tightening seal with the inner wall of the annular hole 5 and the bottom surface of the sealing end cover 4. A hexagonal rotating plate 12 is fixedly connected to the outer surface of the threaded locking cover 3. The first sealing ring 8 is a metal circular ring, and the second sealing ring 10 is an elastic sealing ring. The hexagonal rotating plate 12 facilitates the rotation of the threaded locking cover 3, improving the flexibility of disassembly and assembly.

[0018] Working principle: When connecting and installing the sealing end cap 4 and the connecting end 2, first remove the sealing end cap 4 and rotate it onto the surface of the connecting end 2. Using the hexagonal rotating plate 12, it is convenient for the operator to use tools to tighten the threaded locking cover 3, which can make the sealing end cap 4 and the connecting end 2 tightly connected. When the inner ring of the threaded locking cover 3 is threadedly connected to the surface of the connecting end 2 and tightened, the first sealing ring 8 is squeezed between the inner wall of the annular concave hole 9 and the connecting end 2, which can form the first tight rigid sealing layer, which can withstand the high pressure environment and prevent the medium from leaking from the gap. The second sealing ring 10 is an elastic sealing ring. During the tightening process of the threaded locking cover 3, the second sealing ring 10 further fills the gap and uses its elastic deformation characteristics to make up for the slight sealing deficiencies of the first sealing ring 8, forming the second flexible seal.

[0019] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. A high-pressure and corrosion-resistant valve body casting, characterized in that, The device includes a valve body casting shell, the upper surface of which is provided with a connecting end, a sealing end cap above the connecting end, a threaded locking cover above the sealing end cap, the inner ring of the threaded locking cover being threadedly connected to the outer surface of the connecting end, an annular recessed hole on the bottom surface of the sealing end cap, a first sealing ring and a second sealing ring being fixedly connected to the upper surface of the connecting end, the outer surface of the first sealing ring being in contact with the inner wall of the annular recessed hole, and a high-pressure resistant valve plate sealing ring being fixedly connected to the inner wall of the valve body casting shell.

2. The high-pressure and corrosion-resistant valve body casting according to claim 1, characterized in that, The valve body casting shell is provided with flange connection parts at both ends. Each of the two flange connection parts has multiple connection holes, and each of the two flange connection parts has an annular groove on the side that is far away from each other.

3. The high-pressure and corrosion-resistant valve body casting according to claim 1, characterized in that, The upper surface of the sealing end cap is fitted with a buffer washer, and the upper surface of the buffer washer is in close contact with the upper surface of the threaded locking cover.

4. The high-pressure and corrosion-resistant valve body casting according to claim 1, characterized in that, The inner ring of the connecting end has an annular hole, and a hexagonal rotating plate is fixedly connected to the outer surface of the threaded locking cover.

5. A high-pressure and corrosion-resistant valve body casting according to claim 1, characterized in that, The valve body casting shell has channels at both ends, and the ends of the two channels that are far apart from each other are respectively connected to the ends of the two flange connections that are close to each other.

6. A high-pressure and corrosion-resistant valve body casting according to claim 1, characterized in that, The first sealing ring is a metal circular ring, and the second sealing ring is an elastomeric sealing ring.

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