A global eccentric ball valve

Abstract

The present invention provides a global eccentric ball valve, comprising a valve body, a connector, a valve ball, a first valve seat sealing ring, a second valve seat sealing ring, and a valve stem. One end of the valve ball is connected to the valve stem. The valve ball comprises a first hemisphere, a second hemisphere, and a cavity. The inner sidewall of the valve body is provided with a first valve seat sealing ring, and the inner sidewall of the connector is provided with a second valve seat sealing ring. The centerline b, which is the center of the first hemisphere, and the centerline c, which is the center of the second hemisphere, are located above and below the centerline a of the valve flow channel, respectively. The centerline of the first valve seat sealing ring coincides with the centerline b, and the centerline of the second valve seat sealing ring coincides with the centerline c. This ensures that when the valve flow channel is fully closed, the first valve seat sealing ring tightly fits the first hemisphere, and the second valve seat sealing ring tightly fits the second hemisphere. This avoids the situation where, when the valve flow channel is in the closed position, the upper half of the valve ball fits tightly against the upper end face of the valve seat sealing ring, while the lower half of the valve ball cannot fit tightly against the lower end face of the valve seat sealing ring, or the lower half of the valve ball fits tightly against the lower end face of the valve seat, while the upper half of the valve ball cannot fit tightly against the upper end face of the valve seat sealing ring, thereby fully ensuring the sealing effect of the valve flow channel.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to a global eccentric ball valve. Background Art

[0002] In pipeline fluid systems, ball valves are increasingly used due to considerations of flow resistance and flowability. Their primary function is to shut off or open the fluid passage in a pipeline, typically acting as a closed-circuit valve. However, compared to globe valves, ball valves lack the forced seal characteristic of globe valves. Furthermore, during opening and closing, the ball of the ball valve constantly rubs against the valve, affecting the actuating force.

[0003] Ball valves currently used in industry are classified into non-eccentric ball valves and eccentric ball valves according to whether the rotation center of the ball component is eccentric. In general, in the design of ball valves, conventional ball valves are mostly non-eccentric structure ball valves, while eccentric structure ball valves are mostly hemispherical structures. Ball valves have the characteristics of low fluid resistance and large flow capacity, and can be used in fast closing conditions. However, when using a hemispherical structure, the valve flow resistance will be significantly increased, and the design can only adopt a single valve seat structure. CN108167467A is a two-way sealing ball valve, the valve ball is installed in the valve body, one end of the transmission shaft is connected to the valve ball, the inlet and outlet ends of the valve body are provided with valve seats symmetrical with the valve ball as the center, and the valve seat is pressed to a position sealed with the valve ball by a pressure ring; the valve ball includes two eccentric hemispheres, the flow channel hole of the valve seat is an eccentric hole, and the eccentric hemispheres on the same side are equal to the eccentricity of the flow channel hole and have the same eccentricity direction. This patent application features excellent sealing and low torque at the same flow rate. It also reduces wear on the sealing surfaces of the valve ball and valve seat, eliminating the risk of ball seizure. Although this is a full-spherical eccentric ball valve, when the valve is fully closed, the upper half of the valve ball and the upper half of the valve seat may fit tightly, while the lower half of the valve ball and the lower half of the valve seat may not fit completely, affecting the sealing effect. Summary of the Invention

[0004] In view of this, the present invention aims to propose a global eccentric ball valve, which is used to ensure that when the valve flow channel is fully closed, the first valve seat sealing ring tightly fits the first hemisphere and the second valve seat sealing ring tightly fits the second hemisphere.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] A global eccentric ball valve includes a valve body, a connecting body, a valve ball, a first seat sealing ring, a second seat sealing ring and a valve stem. The valve ball is arranged in a valve flow passage formed by the valve body and the connecting body. One end of the valve ball is connected to the valve stem. The valve ball includes a first hemispherical body, a second hemispherical body and a cavity. A first seat sealing ring is arranged on the inner side wall of the valve body. The first seat sealing ring is located between the first hemispherical body and the valve body. A second seat sealing ring is arranged on the inner side wall of the connecting body. The second seat sealing ring is located between the second hemispherical body and the connecting body. The center line b where the center of the first hemispherical body is located and the center line c where the center of the second hemispherical body is located are respectively on the upper and lower sides of the center line a of the valve flow passage. The center line of the first seat sealing ring coincides with the center line b, and the center line of the second seat sealing ring coincides with the center line c. When ensuring that the valve flow passage is completely closed, the first seat sealing ring closely adheres to the first hemispherical body, and the second seat sealing ring closely adheres to the second hemispherical body. It avoids the situation that when the valve flow passage is in the closed position, the upper part of the valve ball closely adheres to the upper end face of the seat sealing ring, while the lower part of the valve ball cannot closely adhere to the lower end face of the seat sealing ring, or the lower part of the valve ball closely adheres to the lower end face of the seat, while the upper part of the valve ball cannot closely adhere to the upper end face of the seat sealing ring, fully ensuring the sealing effect of the valve flow passage.

[0007] Further, the distance between the center line b and the center line a is h1, and the distance between the center line c and the center line a is h2, and h1 and h2 are not equal. When h2 > h1, the compression amount between the second seat sealing ring and the second hemispherical body is greater. During the process from opening to closing, the valve ball will contact the second seat sealing ring earlier. At this time, the fluid medium entering from the left side of the valve flow passage will be sealed earlier, and there is no need to rotate the valve ball to the horizontal state to achieve the complete sealing effect. At the same time, when the valve ball moves towards the closed position, it will provide a greater compression compensation amount between the second hemispherical body and the sealing ring. When h2 < h1, the compression amount between the first seat sealing ring and the first hemispherical body is greater. During the process from opening to closing, the valve ball will contact the first seat sealing ring earlier. At this time, the fluid medium entering from the right side of the valve flow passage will be sealed earlier, and there is no need to rotate the valve ball to the horizontal state to achieve the complete sealing effect. At the same time, when the valve ball moves towards the closed position, it will provide a greater compression compensation amount between the first hemispherical body and the first seat sealing ring. After the seat is slightly worn, the compression compensation amount can provide a certain sealing effect and extend the service life.

[0008] Further, the first hemispherical body and the second hemispherical body are welded together, and a cavity is formed inside them for the fluid medium to flow through the cavity.

[0009] Furthermore, a first mounting groove is provided on the inner wall of the valve body, in which a first valve seat sealing ring is disposed. A second mounting groove is provided on the inner wall of the connector body, in which a second valve seat sealing ring is disposed. The first and second mounting grooves serve to position and mount the first and second valve seat sealing rings.

[0010] Furthermore, the valve body and the connector are detachably connected, which facilitates disassembly of the two to clean the interior of the valve flow channel.

[0011] Furthermore, the global eccentric ball valve also includes an adapter and a drive device, one end of the adapter being connected to the valve stem and the other end being connected to the drive device. The drive device outputs a transmission force that is transmitted to the valve stem through the adapter, thereby causing the valve stem to drive the valve ball to rotate, thereby controlling the switch position.

[0012] Furthermore, a packing gland is provided at the upper end of the global eccentric ball valve, the valve stem is arranged inside the packing gland, and the interior of the packing gland is filled with packing, and a packing sleeve is provided at the upper end of the packing.

[0013] Compared with the prior art, the global eccentric ball valve of the present invention has the following advantages:

[0014] (1) The center of the first hemisphere and the center of the second hemisphere do not coincide, forming an eccentric structure. The center line of the first valve seat sealing ring coincides with the center line b, and the center line of the second valve seat sealing ring coincides with the center line c. This ensures that when the valve flow channel is fully closed, the first valve seat sealing ring fits tightly against the first hemisphere and the second valve seat sealing ring fits tightly against the second hemisphere.

[0015] (2) When the valve flow channel is gradually opened, the first hemisphere can be prevented from contacting the first valve seat seal ring and the second hemisphere can be prevented from contacting the second valve seat seal ring during the opening process, which can not only reduce the wear of the valve ball but also effectively reduce the valve opening and closing torque during the opening process; when the valve flow channel is gradually closed, under the action of eccentricity, the first hemisphere gradually approaches the first valve seat seal ring and presses the first valve seat seal ring more and more tightly, and the second hemisphere gradually approaches the second valve seat seal ring and presses the second valve seat seal ring more and more tightly, thereby improving the sealing performance of the valve when it is closed.

[0016] (3) h1 and h2 are not equal, and there is a certain amount of compression compensation. Even if the valve seat is slightly worn, the compression compensation can provide a certain sealing effect and extend the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0018] Figure 1 This is a structural schematic diagram of a global eccentric ball valve according to the present invention;

[0019] Figure 2 This is a structural schematic diagram of the global eccentric ball valve of the present invention when it is in a fully closed position;

[0020] Figure 3 This is a structural schematic diagram of the global eccentric ball valve of the present invention rotating counterclockwise from closed to open;

[0021] Figure 4 for Figure 3 A partial enlarged view of point A.

[0022] Description of reference numerals:

[0023] 1. Valve body; 2. Connector; 3. Valve ball; 31. First hemisphere; 32. Second hemisphere; 4. First valve seat seal ring; 5. Second valve seat seal ring; 6. Valve stem; 7. Packing; 8. Packing gland; 9. Packing gland; 10. Adapter; 11. Drive unit; 12. Fasteners. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. The embodiments described in the present invention are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0025] It should be noted that the terms "upper," "lower," "left," "right," "front," and "rear" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of the present invention and simplify the description. They are not intended to indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The embodiments of the present invention and the features therein may be combined with one another unless there is a conflict.

[0026] like Figure 1As shown, a global eccentric ball valve includes a valve body 1, a connector 2, a valve ball 3, a first valve seat sealing ring 4, a second valve seat sealing ring 5 and a valve stem 6. The valve ball 3 is arranged in the valve flow channel formed by the valve body 1 and the connector 2. One end of the valve ball 3 is connected to the valve stem 6. The valve ball 3 includes a first hemisphere 31, a second hemisphere 32 and a cavity. The inner side wall of the valve body 1 is provided with a first valve seat sealing ring 4, and the first valve seat sealing ring 4 is located between the first hemisphere 31 and the valve body 1. The inner side wall of the connector 2 is provided with a second valve seat sealing ring. The seat sealing ring 5 and the second valve seat sealing ring 5 are located between the second hemisphere 32 and the connector 2. The center line b of the first hemisphere 31 and the center line c of the second hemisphere 32 are located on the upper and lower sides of the center line a of the valve flow channel, respectively. The center line of the first valve seat sealing ring 4 coincides with the center line b, and the center line of the second valve seat sealing ring 5 coincides with the center line c. This ensures that when the valve flow channel is fully closed, the first valve seat sealing ring 4 is tightly fitted with the first hemisphere 31, and the second valve seat sealing ring 5 is tightly fitted with the second hemisphere 32. This avoids the situation where, when the valve flow channel is in the closed position, the upper half of the valve ball 3 is tightly fitted with the upper end face of the valve seat sealing ring, while the lower half of the valve ball 3 is not tightly fitted with the lower end face of the valve seat sealing ring, or the lower half of the valve ball 3 is tightly fitted with the lower end face of the valve seat, while the upper half of the valve ball 3 is not tightly fitted with the upper end face of the valve seat sealing ring, thereby fully ensuring the sealing effect of the valve flow channel.

[0027] Through this configuration of the present application, the centers of the first hemisphere 31 and the second hemisphere 32 do not coincide, forming an eccentric structure. Because the centerline of the first valve seat seal ring 4 deviates from the centerline a, and the centerline of the second valve seat seal ring 5 deviates from the centerline b, the first valve seat seal ring 4 forms a valve seat sealing surface with different radii relative to the midpoint O of the valve flow channel, and the second valve seat seal ring 5 forms a valve seat sealing surface with different radii relative to the midpoint O of the valve flow channel. The distance from the midpoint O to the upper end surface of the first valve seat seal ring 4 is denoted as the eccentric radius H, the distance from the midpoint O to the lower end surface of the first valve seat seal ring 4 is denoted as the eccentric radius G, the distance from the midpoint O to the upper end surface of the second valve seat seal ring 5 is denoted as the eccentric radius E, and the distance from the midpoint O to the lower end surface of the second valve seat seal ring 5 is denoted as the eccentric radius F. Eccentric radius G < eccentric radius H, and eccentric radius E < eccentric radius F. Fluid medium flows within the valve flow channel.

[0028] like Figure 2 As shown, the global eccentric ball valve is in a fully closed state. The first valve seat sealing ring 4 is sleeved on the outside of the first hemisphere 31. The first hemisphere 31 squeezes the first valve seat sealing ring 4, forming a good seal with the first hemisphere 31 and the first valve seat sealing ring 4, and cuts off the valve body 1. The second valve seat sealing ring 5 is sleeved on the outside of the second hemisphere 32. The second hemisphere 32 squeezes the second valve seat sealing ring 5, and the second hemisphere 32 and the second valve seat sealing ring 5 form a good seal and cut off the connector 2.

[0029] like Figure 3 As shown in FIG, the valve ball 3 rotates counterclockwise under the action of the valve stem 6, gradually opening the valve flow channel. Under the eccentric action, since the eccentric radius of the first valve seat sealing ring 4 increases from the eccentric radius G to the eccentric radius H, the distance between the first hemisphere 31 and the first valve seat sealing ring 4 increases during the eccentric counterclockwise rotation process, and gradually separates from the first valve seat sealing ring 4, as shown in FIG. Figure 4 As shown, the first hemisphere 31 is prevented from contacting the first valve seat sealing ring 4 during the opening process; since the eccentric radius of the second valve seat sealing ring 5 increases from the eccentric radius E to the eccentric radius F, the distance between the second hemisphere 32 and the second valve seat sealing ring 5 increases during the eccentric counterclockwise rotation of the second hemisphere 32, and gradually separates from the second valve seat sealing ring 5, avoiding contact between the second hemisphere 32 and the second valve seat sealing ring 5 during the opening process, which not only reduces the wear of the valve ball 3 but also effectively reduces the valve opening and closing torque during the opening process. It should be noted that Figure 3 In the embodiment, there is a gap between the first hemisphere 31 and the first valve seat sealing ring 4, and there is a gap between the second hemisphere 32 and the second valve seat sealing ring 5. Figure 4 A partial enlarged view can better illustrate this.

[0030] When the valve ball 3 rotates to a vertical state, the valve flow channel is fully opened. At this time, the valve ball 3 rotates clockwise under the action of the valve stem 6, gradually closing the valve flow channel. Under the action of eccentricity, the first hemisphere 31 gradually approaches the first valve seat sealing ring 4 and presses the first valve seat sealing ring 4 tighter and tighter, and the second hemisphere 32 gradually approaches the second valve seat sealing ring 5 and presses the second valve seat sealing ring 5 tighter and tighter, thereby improving the sealing performance of the valve when it is closed.

[0031] Specifically, in this application, the centerline b of the first hemisphere 31 refers to the horizontal centerline of the first hemisphere 31, and the centerline c of the second hemisphere 32 refers to the horizontal centerline of the second hemisphere 32. The eccentric radius of the first valve seat sealing ring 4 refers to the distance from the midpoint O to the end face of the first valve seat sealing ring 4. The eccentric radius of the second valve seat sealing ring 5 refers to the distance from the midpoint O to the end face of the second valve seat sealing ring 5.

[0032] The first hemisphere 31 and the second hemisphere 32 are welded together, and a cavity is formed inside the two to allow the fluid medium to flow through the cavity. The valve ball 3 is rotatably arranged in the valve flow channel through the valve stem 6, so that the valve ball 3 can be rotated by operating the valve stem 6 to open or close the valve flow channel. When the valve flow channel is open, the cavity and the valve flow channel are connected. When the valve flow channel is closed, the cavity and the valve flow channel are not connected. The valve ball 3 formed by the first hemisphere 31 and the second hemisphere 32 is a full-sphere type, which avoids the problem of large flow resistance of the hemispherical valve and relying on only a single valve seat for sealing.

[0033] As a preferred example of the present invention, the distance between the center line b and the center line a is h1, and the distance between the center line c and the center line a is h2, and h1 and h2 are not equal. One of the end of the valve body 1 deviating from the connecting body 2 and the end of the connecting body 2 deviating from the valve body 1 is the inlet end, and the other is the outlet end. When h1 and h2 are not equal, when the valve ball 3 rotates counterclockwise to gradually close the valve flow passage, the extrusion degrees of the first hemispherical body 31 on the first valve seat sealing ring 4 and the second hemispherical body 32 on the second valve seat sealing ring 5 are different, so that the sealing effects of the inlet end and the outlet end are different, and it can adapt to valve bodies 1 and connecting bodies 2 of different material strengths to meet different usage requirements. In addition, when h2 > h1, the compression amount between the second valve seat sealing ring 5 and the second hemispherical body 32 is larger. During the process from opening to closing, the valve ball 3 will contact the second valve seat sealing ring 5 earlier. At this time, the fluid medium entering from the left side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball 3 to the horizontal state to achieve a completely sealed effect. At the same time, when the valve ball 3 moves towards the closed position, it will provide a larger compression compensation amount between the second hemispherical body 32 and the second valve seat sealing ring 5; when h2 < h1, the compression amount between the first valve seat sealing ring 4 and the first hemispherical body 31 is larger. During the process from opening to closing, the valve ball 3 will contact the first valve seat sealing ring 4 earlier. At this time, the fluid medium entering from the right side of the valve flow passage will be sealed earlier, and it is not necessary to rotate the valve ball 3 to the horizontal state to achieve a completely sealed effect. At the same time, when the valve ball 3 moves towards the closed position, it will provide a larger compression compensation amount between the first hemispherical body 31 and the first valve seat sealing ring 4. Even if the valve seat is slightly worn, the compression compensation amount can provide a certain sealing effect, so as not to affect normal use and extend the service life. Here, the valve ball 3 rotating to the horizontal state means that the first hemispherical body 31 and the second hemispherical body 32 are in the horizontal state.

[0034] Furthermore, a first installation groove is provided on the inner side wall of the valve body 1, and the first valve seat sealing ring 4 is provided in the first installation groove. A second installation groove is provided on the inner side wall of the connecting body 2, and the second valve seat sealing ring 5 is provided in the second installation groove. The first installation groove and the second installation groove play a role in positioning and installing the first valve seat sealing ring 4 and the second valve seat sealing ring 5.

[0035] The valve body 1 and the connecting body 2 are detachably connected, which is convenient for disassembling the two to clean the inside of the valve flow passage. Specifically in the figure of the present application, the valve body 1 and the connecting body 2 are connected by a fastener 12. The fastener 12 is a bolt.

[0036] The global type eccentric ball valve further includes a swivel joint 10 and a driving device 11. One end of the swivel joint 10 is connected to the valve stem 6, and the other end is connected to the driving device 11. The driving device 11 outputs a driving force and transmits it to the valve stem 6 through the swivel joint 10, so that the valve stem 6 drives the valve ball 3 to rotate to achieve the control of the opening and closing positions.

[0037] A packing gland 9 is provided at the upper end of the global eccentric ball valve, and the valve stem 6 is provided inside the packing gland 9. The packing 7 is filled inside the packing gland 9, and the valve stem 6 is clamped by the packing 7 to improve the sealing performance of the valve stem 6 and the packing gland 9. A packing gland 8 is provided at the upper end of the packing 7. The packing gland 9 compresses the packing gland 8 by tightening the bolts, thereby compressing the packing 7 and further improving the sealing performance at the valve stem 6.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A global eccentric ball valve, characterized in that: The invention comprises a valve body (1), a connector (2), a valve ball (3), a first valve seat sealing ring (4), a second valve seat sealing ring (5) and a valve stem (6), wherein the valve ball (3) is arranged in a valve flow channel formed by the valve body (1) and the connector (2), one end of the valve ball (3) is connected to the valve stem (6), the valve ball (3) comprises a first hemisphere (31), a second hemisphere (32) and a cavity, the inner side wall of the valve body (1) is provided with a first valve seat sealing ring (4), the first valve seat sealing ring (4) is located between the first hemisphere (31) and the valve body (1), the inner side wall of the connector (2) is provided with a first valve seat sealing ring (4), the first valve seat sealing ring (4) is located between the first hemisphere (31) and the valve body (1), and the inner side wall of the connector (2) is provided with a first valve seat sealing ring (4). The wall is provided with a second valve seat sealing ring (5), and the second valve seat sealing ring (5) is located between the second hemisphere (32) and the connecting body (2). The center line b where the center of the first hemisphere (31) is located and the center line c where the center of the second hemisphere (32) is located are respectively located on the upper and lower sides of the center line a of the valve flow channel. The center line of the first valve seat sealing ring (4) coincides with the center line b, and the center line of the second valve seat sealing ring (5) coincides with the center line c. The distance between the center line b and the center line a is h1, and the distance between the center line c and the center line a is h2, and the h1 and h2 are not equal.

2. The global eccentric ball valve according to claim 1, characterized in that: The first hemisphere (31) and the second hemisphere (32) are welded together, and a cavity is formed inside the two.

3. The full-spherical eccentric ball valve according to claim 1, characterized in that: A first mounting groove is provided on the inner side wall of the valve body (1), a first valve seat sealing ring (4) is provided in the first mounting groove, a second mounting groove is provided on the inner side wall of the connecting body (2), a second valve seat sealing ring (5) is provided in the second mounting groove.

4. The full-spherical eccentric ball valve according to claim 1, characterized in that: The valve body (1) and the connecting body (2) are detachably connected.

5. The full-spherical eccentric ball valve according to claim 1, characterized in that: The global eccentric ball valve further comprises an adapter (10) and a drive device (11), wherein one end of the adapter (10) is connected to the valve stem (6), and the other end is connected to the drive device (11).

6. The full-spherical eccentric ball valve according to claim 1, characterized in that: A packing gland (9) is provided at the upper end of the global eccentric ball valve, a valve stem (6) is provided inside the packing gland (9), and the interior of the packing gland (9) is filled with packing (7), and a packing sleeve (8) is provided at the upper end of the packing (7).

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