Double-eccentric high-temperature ball valve

Abstract

The double-eccentric high-temperature ball valve comprises a valve body, a valve cover, an upper valve rod, a lower valve rod, a valve element and a valve seat, the lower valve rod is positioned in the valve body to support the valve element, the upper valve rod drives the valve element in the valve body 1 to rotate to be opened and closed, an eccentric shaft is arranged at the end of the upper valve rod, and the upper valve rod is connected with an eccentric hole in the valve element through the eccentric shaft. A first eccentric distance is formed between the center of the eccentric shaft and the center of the valve element, a second eccentric distance is formed between the center of the eccentric shaft and a valve channel, a spring is arranged on the back face of the valve seat in a floating mode, a pressing ring is arranged on the end face of the valve seat and fixed to the valve body to position the valve seat, and a sealing ring is arranged between the valve seat and the valve body. A gap is formed between the valve seat and the pressing ring when the valve is closed. Through the specific design, the sealing device has the advantages of being high in sealing performance, reliable in torque transmission, high in safety and long in service life.

Description

Technical Field

[0001] This utility model relates to a double eccentric high-temperature ball valve. Background Technology

[0002] Eccentric ball valves are widely used in oil and gas refining plants, oil and gas transportation, power systems, and mining and materials processing industries. In coal chemical gasification furnace systems, granular materials are typically present, with extreme temperatures reaching 650℃ and pressures up to 8.5MPa. Similarly, in direct reduction iron processes, the hopper circulation device contains large particles at temperatures as high as 600℃. Polycrystalline silicon plants primarily use micro-powdered materials, also reaching temperatures of 600℃. These operating conditions require not only high temperature and erosion resistance but also high valve flow coefficients, making eccentric ball valves a popular choice. While theoretically, eccentric ball valves can achieve zero-friction opening and closing, due to the eccentricity, a seal is only achieved at a specific position upon closure. Incomplete or excessive closure results in failure to seal, placing high demands on the manufacturing process of the components. Conventional eccentric ball valves use threads or screws to fix the valve seat to the valve body, which cannot compensate for deformation of the sealing surface. When the sealing pair wears down or under high temperatures, differences in material expansion coefficients and stress release during processing can cause deformation of the valve ball and seat sealing surfaces, leading to seal failure. Conventional valve stem and ball connections, such as square hole connections and key connections, have multiple fitting clearances. Frequent opening and closing impacts can loosen the connection between the valve stem and ball, causing changes in the sealing position and resulting in leakage. Utility Model Content

[0003] To address the problems of high-temperature leakage, micro-wear of sealing pairs, and loose transmission chains in existing eccentric ball valves, this invention provides a double eccentric high-temperature ball valve. This double eccentric high-temperature ball valve has a compact structure, strong sealing performance, reliable torque transmission, high safety, and long service life.

[0004] The technical solution adopted by this utility model to solve the technical problem is as follows: it includes a valve body, a valve cover, an upper valve stem, a lower valve stem, a valve core, and a valve seat. The lower valve stem is positioned in the valve body to support the valve core. The upper valve stem drives the valve core in the valve body to rotate and open / close. An eccentric shaft is provided at the end of the upper valve stem. The upper valve stem is connected to the eccentric hole on the valve core through the eccentric shaft. A first eccentric distance is formed between the center of the eccentric shaft and the center of the valve core. A second eccentric distance is formed between the center of the eccentric shaft and the valve channel. The valve seat adopts a floating type with a spring on the back. A pressure ring is provided on the end face of the valve seat. The pressure ring is fixed on the valve body to position the valve seat. A sealing ring is provided between the valve seat and the valve body. When the valve is closed, a gap is formed between the valve seat and the pressure ring.

[0005] The valve cover is fixedly installed on the upper end of the valve body by screws, and the upper valve stem passes through the valve cover and drives the valve core to rotate and open / close inside the valve body 1.

[0006] The valve cover is fixed to the side of the valve body with screws, and the upper valve stem passes through the valve body to drive the valve core to rotate and open / close within the valve body.

[0007] The pressure ring is threaded to the valve body.

[0008] The pressure ring is fixed to the valve body by screws.

[0009] An extended neck is provided on the outside of the upper valve stem. The extended neck is fixed on the valve cover. Heat sinks are provided on the outside of the extended neck. The upper end of the upper valve stem is connected to a pneumatic actuator.

[0010] An extended neck is provided on the outside of the upper valve stem. The extended neck is fixed to the valve body and a heat sink is provided on the outside of the extended neck. The upper end of the upper valve stem is connected to a pneumatic actuator.

[0011] A packing seal is used between the upper valve stem and the extended neck. The packing is tightened by the gland bolts, and a compensating disc spring is installed at the gland bolts.

[0012] Through the above-described specific design, this utility model has the following advantages:

[0013] 1. The valve seat adopts a floating type, and there is a slight gap between the valve seat and the pressure ring, which can compensate for the wear of long-term contact between the ball seat and the valve seat, and can also compensate for the deformation of the sealing surface between the valve ball and the valve seat at high temperature, making the seal more reliable.

[0014] 2. This valve features two eccentricities. Eccentricity one ensures that the upper valve stem extends into the valve ball with only a shaft-hole fit clearance, eliminating edge impact and making torque transmission more reliable. Eccentricity two ensures that the valve ball only contacts the valve seat momentarily during closing and opening, reducing friction loss and extending service life.

[0015] 3. The long neck is equipped with heat sinks to protect the pneumatic actuator from high temperatures, prevent damage to pneumatic seals, and improve safety and lifespan.

[0016] 4. The valve stem uses a packing seal, and a compensating disc spring is installed at the gland bolt, which can effectively compensate for thermal deformation of parts and wear of packing, and extend the service life of the valve. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments of this utility model will be briefly described below. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the assembly structure of Embodiment 1 of this utility model.

[0019] Figure 2 yes Figure 1 AA sectional view.

[0020] Figure 3 yes Figure 1 Structural diagram of the middle valve seat.

[0021] Figure 4 This is a schematic diagram of the assembly structure of Embodiment 2 of this utility model.

[0022] Figure 5 yes Figure 4 Structural diagram of the middle valve seat.

[0023] In the diagram: 1. Valve body; 2. Valve cover; 3. Upper valve stem; 4. Lower valve stem; 5. Valve core; 6. Valve seat; 7. Eccentric shaft; 8. Eccentric hole; 9. First eccentricity; 10. Second eccentricity; 11. Spring; 12. Pressure ring; 13. Clearance; 14. Screw; 15. Extended neck; 16. Heat sink; 17. Pneumatic actuator; 18. Packing; 19. Pressure cover; 20. Pressure cover bolt; 21. Compensating disc spring; 22. Sealing ring; 23. Valve stem bearing. Detailed Implementation

[0024] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0025] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual images. They should not be construed as limiting the scope of this patent. To better illustrate the embodiments of this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0026] In the accompanying drawings of this utility model, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," "right," "inner," and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they 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. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the term "connection" or similar designation indicating the connection relationship between components should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can refer to the internal communication of two components or the interaction between 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.

[0028] As shown in the figure, this utility model includes a valve body 1, a valve cover 2, an upper valve stem 3, a lower valve stem 4, a valve core 5, and a valve seat 6. The lower valve stem 4 is positioned inside the valve body 1 to support the valve core 5. The upper valve stem 3 drives the valve core 5 inside the valve body 1 to rotate and open / close. The upper valve stem 3 is characterized by an eccentric shaft 7 at its end, which connects to an eccentric hole 8 on the valve core 5. A first eccentricity 9 is formed between the center of the eccentric shaft 7 and the center of the valve core 5. This first eccentricity 9 ensures that the upper valve stem 3 only has a shaft-hole fit clearance when extending into the valve core 5, eliminating edge impact and making torque transmission more reliable. A second eccentricity 10 is formed between the center of the eccentric shaft 7 and the valve flow channel. This second eccentricity 10 ensures that the valve core 5 only contacts the valve seat 6 at the moment of closing and opening, reducing friction loss and improving service life. The valve seat 6 is floating, with a spring 11 on its back providing sealing force. A pressure ring 12 is provided on the end face of the valve seat 6 to prevent excessive extension. A pressure ring 12 is fixed to the valve body 1 to position the valve seat 6. A sealing ring 22 is provided between the valve seat 6 and the valve body 1. When the valve is closed, a gap 13 is formed between the valve seat 6 and the pressure ring 12. When the valve is closed and the valve core 5 contacts the valve seat 6, the spring 11 is fully compressed, and a gap 13 is formed between the valve seat 6 and the pressure ring 12. When the valve is opened, the valve seat 6 moves forward slightly, and the gap 13 is eliminated. The gap 13 can compensate for the wear of the ball seat due to long-term contact and can also compensate for the deformation of the sealing surfaces of the valve core 5 and the valve seat 6 at high temperatures, making the seal more reliable. Figure 1 The valve cover 2 shown is fixedly mounted on the upper end of the valve body 1 by screws. The upper valve stem 3 passes through the valve cover 2 and drives the valve core 5 to rotate and open / close within the valve body 1. The pressure ring 12 is threadedly connected to the valve body 1. Figure 4 The valve cover 2 shown is fixedly mounted on the side of the valve body 1 by screws. The upper valve stem 3 passes through the valve body 1 and drives the valve core 5 to rotate and open / close within the valve body 1. The pressure ring 12 is fixed to the valve body 1 by screws 14. Figure 1 As shown, an extended neck 15 is provided on the outside of the upper valve stem 3. The extended neck 15 is fixed on the valve cover 2, and a heat sink 16 is provided on the outside of the extended neck 15. The upper end of the upper valve stem 3 is connected to a pneumatic actuator 17. Figure 4An extended neck 15 is provided outside the upper valve stem 3, and the extended neck 15 is fixed to the valve body 1. A heat sink 16 is provided on the outside of the extended neck 15. The upper end of the upper valve stem 3 is connected to the pneumatic actuator 17. The heat sink 16 protects the pneumatic actuator 17 from high temperature, prevents damage to the pneumatic seals, and improves safety and lifespan. A packing 18 is used to seal between the upper valve stem 3 and the extended neck 15. A valve stem bearing 23 is provided below the packing 18. The packing 18 is pressed by a gland 19 through a gland bolt 20. A compensating disc spring 21 is provided at the gland bolt 20. The compensating disc spring 21 can effectively compensate for thermal deformation of parts and wear of packing, extending the service life of the valve. In this utility model, the ball crowns at both ends of the valve core 5 are flattened to increase the space between the valve core 5 and the valve cavity, so that the material accumulated in the valve cavity is carried to the downstream end during the opening and closing of the valve, preventing material accumulation.

[0029] It should be stated that the above-described specific embodiments are merely preferred embodiments of this utility model and the technical principles employed. Those skilled in the art should understand that various modifications, equivalent substitutions, and variations can be made to this utility model. However, such variations, as long as they do not depart from the spirit of this utility model, should be within the protection scope of this utility model. Furthermore, some terminology used in this application specification and claims is not limiting, but merely for ease of description.

Claims

1. A double eccentric high-temperature ball valve, comprising a valve body, a valve cover, an upper valve stem, a lower valve stem, a valve core, and a valve seat, wherein the lower valve stem is positioned within the valve body to support the valve core, and the upper valve stem drives the valve core within the valve body to rotate for opening and closing, characterized in that... An eccentric shaft (7) is provided at the end of the upper valve stem (3). The eccentric shaft (7) is connected to the eccentric hole (8) on the valve core (5). A first eccentric distance (9) is formed between the center of the eccentric shaft (7) and the center of the valve core (5). A second eccentric distance (10) is formed between the center of the eccentric shaft (7) and the valve flow channel. The valve seat (6) adopts a floating type and a spring (11) is provided on the back. A pressure ring (12) is provided on the end face of the valve seat (6). The pressure ring (12) is fixed on the valve body (1) to position the valve seat (6). A sealing ring (22) is provided between the valve seat (6) and the valve body (1). A gap (13) is formed between the valve seat (6) and the pressure ring (12) when the valve is closed.

2. The double eccentric high-temperature ball valve according to claim 1, characterized in that: The valve cover (2) is fixedly installed on the upper end of the valve body (1) by screws. The upper valve stem (3) passes through the valve cover (2) and drives the valve core (5) to rotate and open / close inside the valve body (1).

3. A double eccentric high-temperature ball valve according to claim 1, characterized in that... The valve cover (2) is fixedly installed on the side of the valve body (1) by screws, and the upper valve stem (3) passes through the valve body (1) to drive the valve core (5) to rotate and open and close inside the valve body (1).

4. A double eccentric high-temperature ball valve according to claim 2, characterized in that... The pressure ring (12) is threaded to the valve body (1).

5. A double eccentric high-temperature ball valve according to claim 3, characterized in that... The pressure ring (12) is fixed to the valve body (1) by screws (14).

6. A double eccentric high-temperature ball valve according to claim 2 or 4, characterized in that... An extended neck (15) is provided on the outside of the upper valve stem (3). The extended neck (15) is fixed on the valve cover (2). A heat sink (16) is provided on the outside of the extended neck (15). The upper end of the upper valve stem (3) is connected to a pneumatic actuator (17).

7. A double eccentric high-temperature ball valve according to claim 3 or 5, characterized in that... An extended neck (15) is provided on the outside of the upper valve stem (3). The extended neck (15) is fixed on the valve body (1). A heat sink (16) is provided on the outside of the extended neck (15). The upper end of the upper valve stem (3) is connected to a pneumatic actuator (17).

8. A double eccentric high-temperature ball valve according to claim 6, characterized in that... The upper valve stem (3) and the extended neck (15) are sealed with packing (18). The packing (18) is pressed by the gland (19) through the gland bolt (20). A compensating disc spring (21) is provided at the gland bolt (20).

9. A double eccentric high-temperature ball valve according to claim 7, characterized in that... The upper valve stem (3) and the extended neck (15) are sealed with packing (18). The packing (18) is pressed by the gland (19) through the gland bolt (20). A compensating disc spring (21) is provided at the gland bolt (20).

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