A C-type ball valve

Abstract

The application provides a C-shaped ball valve, which comprises a valve body, a valve seat and a ball body, the ball body is C-shaped, an annular gap is formed between the valve seat and the valve body, a first elastic member, a first metal ring, flexible graphite and a second metal ring are sequentially arranged on the outer periphery of the valve seat away from one end of the ball body, the first elastic member, the first metal ring, the flexible graphite and the second metal ring are all arranged in the annular gap, one end of the first elastic member is abutted against the valve body, the other end of the first elastic member is abutted against the first metal ring, the first metal ring and the second metal ring are both V-shaped convex surfaces close to one end of the flexible graphite, the two ends of the flexible graphite are both V-shaped concave surfaces, the V-shaped convex surface is matched with the V-shaped concave surface, and the other end of the second metal ring is abutted against the valve seat. Regardless of the direction of the pressure, the flexible graphite and the metal ring are tightly attached, the upper and lower ends of the deformed flexible graphite are respectively attached to the valve seat and the valve body to form a seal.

Description

Technical Field

[0001] This invention belongs to the field of valve technology, and specifically relates to a C-type ball valve. Background Technology

[0002] Type C ball valves are used in domestic and international coal chemical, polysilicon, nuclear power, photovoltaic, LNG and other environments. Compared with traditional valves, Type C ball valves perform better under harsh working conditions (such as high temperature, high pressure, ultra-low temperature, high and low temperature alternation, and multiple mixed media).

[0003] A reference to the valve seat structure of a C-type ball valve Figure 1 When the ball 3 is closed, it presses the valve seat 2 against the sealing gasket. The valve seat 2 and the valve body 1 are in contact when the valve is closed. However, this structure is a forced sealing structure. Although the valve can achieve good bidirectional sealing at constant temperature, once there is a temperature difference in the valve, the valve cannot be adjusted and leakage will occur. At low temperature, the metal parts shrink. Due to the lack of elastic element compensation, dynamic sealing leakage occurs. At high temperature, the metal parts expand, and the valve seat and ball will seize up or get stuck. Summary of the Invention

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A C-type ball valve includes a valve body, a valve seat, and a ball. The ball is C-shaped. A horizontal flow channel is provided inside the valve body. The ball is fixed in the middle of the flow channel inside the valve body by a valve stem and rotates axially along the valve stem. The valve seat is fixed in the flow channel inside the valve body near one end of the ball. When the ball rotates to face the valve seat from the outside, it abuts against the valve seat. An annular gap exists between the valve seat and the valve body. The outer periphery of the valve seat is furthest from the ball. The valve seat is sequentially fitted with a first elastic element, a first metal ring, flexible graphite, and a second metal ring, all of which are located within the annular gap. One end of the first elastic element abuts against the valve body, and the other end abuts against the first metal ring. The ends of the first and second metal rings closest to the flexible graphite are both V-shaped convex surfaces, and both ends of the flexible graphite are V-shaped concave surfaces, with the V-shaped convex surfaces and V-shaped concave surfaces engaging with each other. The other end of the second metal ring abuts against the valve seat.

[0005] Preferably, the valve body is provided with a first groove, the first groove is provided on the side end of the valve body near the valve seat, and a second elastic element is provided in the first groove, the second elastic element abutting against the valve seat.

[0006] Preferably, the valve seat includes an insertion part and an abutment part. One end of the abutment part is connected to the insertion part, and the other end is in floating contact with the ball. The outer diameter of the abutment part is larger than the outer diameter of the insertion part. The end of the insertion part away from the abutment part is provided with a first contact part and a second contact part. The outer diameter of the first contact part is smaller than the outer diameter of the second contact part.

[0007] Preferably, the annular gap is formed by the second groove inside the valve body and the outer periphery of the insertion part, the first elastic element is sleeved on the outside of the first contact part, and the first metal ring, flexible graphite and second metal ring are all sleeved on the outside of the second contact part.

[0008] Preferably, the first elastic element is a disc spring.

[0009] Preferably, there are multiple first grooves, which are distributed in a circumferential array along the valve body; there are multiple second elastic elements, one end of which abuts against the abutting portion; and the second elastic element is a helical spring.

[0010] Preferably, the valve seat is axially limited by a pressure plate, and the pressure plate is fixed to the valve body by screws.

[0011] Preferably, dustproof rings are provided between the valve seat and the valve body, between the valve seat and the pressure plate, and between the pressure plate and the valve body.

[0012] Preferably, the included angle of the V-shaped convex surface is greater than the included angle of the V-shaped concave surface.

[0013] Preferably, the second metal ring includes a metal ring body and a plurality of metal ring support portions spaced apart on the end face of the metal ring body. The metal ring support portions are arc-shaped, and the radial width of the metal ring support portions is smaller than the radial width of the metal ring body. The metal ring body abuts against the flexible graphite.

[0014] The cable sheath obtained through the above technical solution has the following beneficial effects:

[0015] By setting a first metal ring, flexible graphite, and a second metal ring between the valve seat and the valve body, and using a V-shaped surface for fit, the sealing requirements between the valve seat and the valve body under high pressure conditions can be met. No matter which direction the pressure comes in, the flexible graphite and the metal ring will be tightly pressed together. After the flexible graphite is deformed, the upper and lower ends are respectively pressed against the valve seat and the valve body, thereby achieving a seal. The higher the pressure, the greater the thrust, and the better the sealing effect.

[0016] By setting a first elastic element between the valve seat and the valve body, an initial pressure can be applied to the flexible graphite to meet the sealing requirements between the valve seat and the valve body under low-pressure conditions.

[0017] By incorporating a second elastic element on the valve body that abuts against the valve seat, an initial pressure is applied to the valve seat, ensuring a seal between the valve seat and the ball. Simultaneously, under low-temperature conditions, the metal parts contract, and the second elastic element pushes the valve seat towards the ball, guaranteeing a seal between the valve seat and the ball under these conditions; under high-temperature conditions, the metal parts expand, and the second elastic element compresses, preventing the valve seat and ball from seizing up. Attached Figure Description

[0018] Figure 1 This is a structural schematic diagram of a C-type ball valve seat in existing technology;

[0019] Figure 2 This is a half-sectional view of the C-type ball valve described in this invention;

[0020] Figure 3 This is the invention described Figure 2 Enlarged view of part A;

[0021] Figure 4 This is a schematic diagram of the valve seat described in this invention;

[0022] Figure 5 This is a schematic diagram of the structure of the valve body (sub-valve body part) described in this invention;

[0023] Figure 6 This is a schematic diagram of the structure of the second metal ring of the present invention.

[0024] In the figure, 1 is the valve body; 2 is the valve seat; 3 is the ball; 4 is the valve stem; 5 is the first elastic element; 6 is the first metal ring; 7 is the flexible graphite; 8 is the second metal ring; 9 is the pressure plate; 10 is the second elastic element; 11 is the first groove; 12 is the second groove; 21 is the insertion part; 21a is the first contact part; 21b is the second contact part; 22 is the abutment part; 81 is the metal ring body; 82 is the metal ring support part. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0026] Unless otherwise defined, the technical terms used in the following embodiments have the same meaning as commonly understood by those skilled in the art to which this invention pertains.

[0027] The present invention will be further explained and described below with reference to the embodiments and accompanying drawings. It should be understood that the present invention is not limited to the specific embodiments described.

[0028] like Figure 2 , Figure 3As shown, this invention proposes a C-type ball valve, comprising a valve body 1, a valve seat 2, and a ball 3. The ball 3 is C-shaped. A horizontal flow channel is provided inside the valve body 1. The ball 3 is fixed to the middle of the flow channel inside the valve body 1 by a valve stem 4 and rotates axially along the valve stem 4. The valve seat 2 is fixed inside the valve body 1 on the flow channel near one end of the ball 3. When the ball 3 rotates to the point where its outer wall faces the valve seat 2, it abuts against the valve seat 2, at which point the valve is closed, and the liquid in the flow channel stops flowing. An annular gap exists between the valve seat 2 and the valve body 1, and the outer periphery of the valve seat 2 is away from the ball. One end of valve 3 is sequentially fitted with a first elastic element 5, a first metal ring 6, a flexible graphite 7, and a second metal ring 8, all within the annular gap. One end of the first elastic element 5 abuts against the valve body 1, and the other end abuts against the first metal ring 6. The ends of the first metal ring 6 and the second metal ring 8 near the flexible graphite 7 are both V-shaped convex surfaces, and both ends of the flexible graphite 7 are V-shaped concave surfaces, with the convex and concave surfaces engaging. The other end of the second metal ring 6 abuts against the valve seat 2. The first metal ring 6, flexible graphite 7, and second metal ring 8 are engaged with a V-shaped surface, allowing the flexible graphite 7 to be compressed regardless of which direction the pressure increases, thus improving its sealing performance. When there is pressure upstream (pressure direction from left to right), the first elastic element 5 provides a thrust to the first metal ring 6, which can ensure that the static seal between the valve seat and the valve body does not leak. When there is pressure downstream (pressure direction from right to left), the first elastic element 5 acts as an adjusting element and undergoes deformation and compression.

[0029] like Figure 5 As shown, a first groove 11 is provided on the valve body 1, located on the side of the valve body 1 near the valve seat 2. A second elastic element 10 is disposed within the first groove 11, and the second elastic element 10 abuts against the valve seat 2. The second elastic element 10 can provide an initial thrust to the valve seat 2, satisfying the dynamic sealing requirements between the valve seat 2 and the ball 3. Simultaneously, under low-temperature conditions, the second elastic element 10 pushes the valve seat 2 towards the ball 3 when the metal parts contract, ensuring a seal under low-temperature conditions; under high-temperature conditions, the metal parts expand, and the second elastic element 10 compresses, preventing the valve seat 2 and the ball 3 from seizing up.

[0030] like Figure 4 As shown, the valve seat 2 includes an insertion part 21 and an abutment part 22. One end of the abutment part 22 is connected to the insertion part, and the other end is in floating contact with the ball 3. The outer diameter of the abutment part 22 is larger than the outer diameter of the insertion part 21. The end of the insertion part 21 away from the abutment part 22 is provided with a first contact part 21a and a second contact part 21b. The outer diameter of the first contact part 21a is smaller than the outer diameter of the second contact part 21b.

[0031] The annular gap is formed by the second groove 12 inside the valve body 1 and the outer periphery of the insertion part 21. The first elastic element 5 is sleeved on the outside of the first contact part 21a, and the first metal ring 6, flexible graphite 7, and second metal ring 8 are all sleeved on the outside of the second contact part 21b. By setting two contact parts, the deformation of the first elastic element 5 can be controlled, avoiding excessive deformation that could cause excessive force on the valve seat 2 and lock-up damage to the ball 3.

[0032] The first elastic element 5 is a disc spring.

[0033] There are multiple first grooves 11, which are arranged in a circumferential array along the valve body 1. There are also multiple second elastic elements 10, one end of which abuts against the abutment portion 22. The second elastic element 10 is a helical spring. By providing multiple second elastic elements 10, the elasticity of the contact between the valve seat 2 and the ball 3 can be effectively improved, thereby enhancing the sealing performance between the ball 3 and the valve seat 2.

[0034] The valve seat 2 is axially limited by the pressure plate 9, which is fixed to the valve body 1 by screws.

[0035] Dustproof rings are provided between the valve seat 2 and the valve body 1, between the valve seat 2 and the pressure plate 9, and between the pressure plate 9 and the valve body 1. These rings effectively isolate the media in dusty, particulate, and solid media conditions, preventing dust accumulation from affecting the elastic elements.

[0036] The included angle of the V-shaped convex surface is greater than that of the V-shaped concave surface, creating a gap between the V-shaped convex surface and the V-shaped concave surface. This increases the deformation degree of the flexible graphite 7, thereby further improving the sealing performance of the flexible graphite 7.

[0037] The second metal ring 8 includes a metal ring body 81 and a plurality of metal ring support portions 82 spaced apart at the end face of the metal ring body 81. The metal ring support portions 82 are arc-shaped, and the radial width of the metal ring support portions 82 is smaller than the radial width of the metal ring body 81. The metal ring body 81 abuts against the flexible graphite 7. The metal ring support portions 82 have an open design, so that the second metal ring 8 and the valve seat 2 are not in full contact. When reverse pressure arrives, the second metal ring 8 and the valve seat 2 quickly separate, and the pressure pushes the valve seat 2 toward the ball 3.

[0038] In use, the rotation angle of the ball 3 can be adjusted by rotating the valve stem 4, which opens or closes the flow channel inside the valve body 1. When upstream pressure occurs (pressure direction from left to right), the first elastic element 5 pushes the first metal ring 6, causing the first metal ring 6 to move towards the flexible graphite 7 and the second metal ring 8, thus satisfying the static seal between the valve seat 2 and the valve body 1. The second metal ring 8 drives the valve seat 2 to push towards the ball 3, and the second elastic element 10 simultaneously pushes the valve seat 2 towards the ball 3, thus satisfying the dynamic seal between the valve seat 2 and the ball 3. When downstream pressure occurs (pressure direction from right to left), the pressure reaches the right side of the valve seat 2, pushing the second metal ring 8 towards the flexible graphite 7. The first elastic element 3 is compressed, and the valve seat 2 separates from the second metal ring 8, allowing the pressure to push the valve seat 2 towards the ball 3. The second elastic element 10 simultaneously pushes the valve seat 2 towards the ball 3, ensuring the dynamic seal.

[0039] Under low-pressure conditions, when upstream pressure (pressure direction from left to right) occurs, the first elastic element 5 and the second elastic element 10 can provide an initial thrust to the valve seat 2, pushing the valve seat 2 towards the ball 3, thus satisfying the dynamic sealing requirement between the valve seat 2 and the ball 3. When downstream pressure (pressure direction from right to left) occurs, the second elastic element 10 can provide an initial thrust to the valve seat 2, pushing the valve seat 2 towards the ball 3, thus satisfying the dynamic sealing requirement between the valve seat 2 and the ball 3.

[0040] Under low temperature conditions, the first elastic element 5 and the second elastic element 10 push the valve seat 2 towards the ball 3 when the metal parts contract, ensuring dynamic sealing under low temperature conditions; under high temperature conditions, the metal parts expand, and the first elastic element 5 and the second elastic element 10 compress, which can prevent the valve seat 2 and the ball 3 from expanding and seizing.

[0041] When the downstream pressure is low, the second elastic element 10 pushes the valve seat 2 towards the ball 3 when the metal parts contract, ensuring dynamic sealing under low temperature conditions; under high temperature conditions, the metal parts expand and the second elastic element 10 compresses, which can prevent the valve seat 2 and the ball 3 from expanding and seizing.

[0042] The above technical solutions only embody the preferred technical solutions of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof embody the principles of the present invention and fall within the protection scope of the present invention.

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other.

[0044] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention 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 the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" 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 communication between two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

Claims

1. A C-type ball valve, comprising a valve body (1), a valve seat (2), and a ball (3), wherein the ball (3) is C-shaped, the valve body (1) has a horizontal flow channel inside, the ball (3) is fixed to the middle of the flow channel inside the valve body (1) by a valve stem (4) and rotates axially along the valve stem (4), the valve seat (2) is fixed to the flow channel inside the valve body (1) near one end of the ball (3), the ball (3) abuts against the valve seat (2) when its outer wall faces the valve seat (2), and there is an annular gap between the valve seat (2) and the valve body (1), characterized in that, The valve seat (2) is provided with a first elastic element (5), a first metal ring (6), a flexible graphite (7), and a second metal ring (8) in sequence at the outer periphery away from the ball (3). The first elastic element (5), the first metal ring (6), the flexible graphite (7), and the second metal ring (8) are all in the annular gap. One end of the first elastic element (5) abuts against the valve body (1), and the other end abuts against the first metal ring (6). The ends of the first metal ring (6) and the second metal ring (8) near the flexible graphite (7) are both V-shaped convex surfaces. Both ends of the flexible graphite (7) are V-shaped concave surfaces, and the V-shaped convex surface and the V-shaped concave surface cooperate with each other. The other end of the second metal ring (6) abuts against the valve seat (2).

2. A C-type ball valve according to claim 1, characterized in that, The valve body (1) is provided with a first groove (11), which is located on the side of the valve body (1) near the valve seat (2). A second elastic element (10) is provided in the first groove (11), and the second elastic element (10) abuts against the valve seat (2).

3. A C-type ball valve according to claim 2, characterized in that, The valve seat (2) includes an insertion part (21) and an abutment part (22). One end of the abutment part (22) is connected to the insertion part (21), and the other end is in floating contact with the ball (3). The outer diameter of the abutment part (22) is larger than the outer diameter of the insertion part (21). The end of the insertion part (21) away from the abutment part (22) is provided with a first contact part (21a) and a second contact part (21b). The outer diameter of the first contact part (21a) is smaller than the outer diameter of the second contact part (21b).

4. A C-type ball valve according to claim 3, characterized in that, The annular gap is formed by the second groove (12) inside the valve body (1) and the outer periphery of the insertion part (21). The first elastic element (5) is sleeved on the outside of the first contact part (21a). The first metal ring (6), flexible graphite (7), and second metal ring (8) are all sleeved on the outside of the second contact part (21b).

5. A C-type ball valve according to claim 1, characterized in that, The first elastic element (5) is a disc spring.

6. A C-type ball valve according to claim 3, characterized in that, The number of the first grooves (11) is multiple, and the multiple first grooves (11) are distributed in a circumferential array along the valve body (1). The number of the second elastic members (10) is multiple, and one end of the second elastic member (10) abuts against the abutting part (22). The second elastic member (10) is a helical spring.

7. A C-type ball valve according to claim 1, characterized in that, The valve seat (2) is axially limited by the pressure plate (9), which is fixed to the valve body (1) by screws.

8. A C-type ball valve according to claim 1, characterized in that, Dustproof rings are provided between the valve seat (2) and the valve body (1), between the valve seat (2) and the pressure plate (9), and between the pressure plate (9) and the valve body (1).

9. A C-type ball valve according to claim 1, characterized in that, The included angle of the V-shaped convex surface is greater than the included angle of the V-shaped concave surface.

10. A C-type ball valve according to claim 1, characterized in that, The second metal ring (8) includes a metal ring body (81) and a plurality of metal ring support portions (82) spaced apart on the end face of the metal ring body (81). The metal ring support portions (82) are arc-shaped and the radial width of the metal ring support portions (82) is smaller than the radial width of the metal ring body (81). The metal ring body (81) abuts against the flexible graphite (7).

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