Bidirectional sealing ball valve

Abstract

The utility model discloses a bidirectional sealing ball valve which comprises a valve body and a valve rod, the valve rod is inserted into the valve body, a valve cover is arranged on the valve body, a ball body is arranged in the valve body, the valve rod is connected with the ball body, an upstream sealing assembly is arranged on the upstream side of the ball body, a downstream sealing assembly is arranged on the downstream side of the ball body, and one side of the upstream sealing assembly is in contact connection with the valve cover. The other side of the upstream sealing assembly is in contact connection with the ball, one side of the downstream sealing assembly is in contact connection with the valve body, the other side of the downstream sealing assembly is in contact connection with the ball, and the upstream sealing assembly forms side pressure towards the downstream sealing assembly on the ball. Two-way sealing is achieved, the dynamic sealing effect is achieved, and the sealing performance of the valve is improved.

Description

Technical Field

[0001] The utility model relates to a valve, in particular to a two-way sealing ball valve. Background Art

[0002] There are many types of valves, and different structural types of valves are applied in different occasions. As one type of valve, the floating ball valve is mainly used for fluid sealing. Due to its own structural limitations, most floating ball valves can only achieve one-way sealing, that is, downstream single-seat sealing. In occasions with high sealing requirements, once the downstream single seat is damaged, the valve sealing fails. Content of the Utility Model

[0003] In order to solve the above technical problems, the present invention provides a two-way sealing ball valve to form a dynamic seal and improve the sealing performance.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] A two-way sealing ball valve includes a valve body and a valve stem. The valve stem is inserted into the valve body. A valve cover is provided on the valve body. A ball is provided in the valve body. The valve stem is connected to the ball. An upstream sealing assembly is provided on the upstream side of the ball, and a downstream sealing assembly is provided on the downstream side of the ball. One side of the upstream sealing assembly is in contact connection with the valve cover, and the other side is in contact connection with the ball. One side of the downstream sealing assembly is in contact connection with the valve body, and the other side is in contact connection with the ball. The upstream sealing assembly forms a lateral pressure on the ball towards the downstream sealing assembly.

[0006] The upstream sealing assembly includes an upper valve seat, an upper sealing ring and a disc spring. An upstream inclined surface is provided on one side of the upper valve seat. The upper valve seat contacts the ball through the upstream inclined surface. One side of the upper sealing ring is connected to the upper valve seat, and the other side is connected to the valve cover. One side of the disc spring is connected to the valve cover, and the other side abuts against the upper valve seat. The disc spring is in a compressed state, and the disc spring presses on the upper valve seat to keep the upper valve seat pressing on the ball.

[0007] A retaining ring is provided between the upper sealing ring and the disc spring. The retaining ring abuts against the upper sealing ring, and the disc spring abuts against the retaining ring.

[0008] The upstream inclined surface of the upper valve seat is a cemented carbide surface, and the upper sealing ring is trapezoidal.

[0009] The downstream sealing assembly includes a lower valve seat and a lower sealing ring. One side of the lower valve seat is in contact connection with the valve body, and the other side is in contact connection with the ball. The lower sealing ring is installed on the lower valve seat and is in contact connection with the valve body.

[0010] A downstream inclined surface is provided on one side of the lower valve seat. The lower valve seat contacts the ball through the downstream inclined surface. The downstream inclined surface is a cemented carbide surface.

[0011] The lower sealing ring is trapezoidal in shape.

[0012] Compared with the prior art, the utility model has the following beneficial technical effects:

[0013] Sealing assemblies are provided upstream and downstream of the sphere respectively, and the upstream-side sealing assembly maintains a thrust force. Even if part of the medium leaks from the upstream side into the valve cavity, the medium pressure acts on the back of the upper valve seat, and the provided pressure still pushes the upper valve seat towards the sphere, establishing a dynamic sealing effect and further ensuring the sealing of the valve. Description of the Drawings

[0014] Figure 1 is a schematic cross-sectional structure diagram of the utility model;

[0015] Figure 2 is Figure 1 an enlarged schematic view of part A in

[0016] Figure 3 is Figure 1 an enlarged schematic view of part B in

[0017] Reference Signs: Detailed Embodiments

[0018] The following details the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation of the present invention.

[0019] In the description of the present invention, it should be understood that if there are terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "coupling" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] Reference Figures 1-3 As shown, a two-way sealing ball valve includes a valve body 1 and a valve stem 2. The valve stem 2 is inserted into the valve body 1. A valve cover 3 is provided on the valve body 1. A ball 4 is provided inside the valve body 1. The valve stem 2 is connected to the ball 4. An upstream sealing assembly 5 is provided on the upstream side of the ball 4, and a downstream sealing assembly 6 is provided on the downstream side of the ball 4. One side of the upstream sealing assembly 5 is in contact connection with the valve cover 3, and the other side of the upstream sealing assembly 5 is in contact connection with the ball 4. One side of the downstream sealing assembly 6 is in contact connection with the valve body 1, and the other side of the downstream sealing assembly 6 is in contact connection with the ball 4. The upstream sealing assembly 5 forms a lateral pressure on the ball 4 towards the downstream sealing assembly 6, and the ball 4 will form a thrust on the downstream sealing assembly 6, forming a stable seal for the downstream sealing assembly. Through the two-side sealing of the upstream sealing assembly and the downstream sealing assembly, the sealing effect is ensured.

[0022] The upstream sealing assembly 5 includes an upper valve seat 51, an upper sealing ring 52, and a disc spring 53. An upstream inclined surface 54 is provided on one side of the upper valve seat 51. The upper valve seat 51 contacts the ball 4 through the upstream inclined surface 54. One side of the upper sealing ring 52 is connected to the upper valve seat 51, and the other side is connected to the valve cover 3. One side of the disc spring 53 is connected to the valve cover 3, and the other side abuts against the upper valve seat 51. The disc spring 53 is in a compressed state, and the disc spring 53 presses against the upper valve seat 51 to keep the upper valve seat 51 pressing against the ball 4. A retaining ring 55 is provided between the upper sealing ring 52 and the disc spring 53. The retaining ring 55 abuts against the upper sealing ring 52, and the disc spring 53 abuts against the retaining ring 55. The retaining ring 55 mainly serves to tightly press the upper sealing ring 52, and the upper sealing ring 52 realizes the seal between the upper valve seat 51 and the valve cover 3. Since the disc spring 53 itself is in a compressed state, it maintains a resilience force and pushes the upper valve seat 51 towards the ball 4. Due to the interaction of forces, the supporting surface of the disc spring 53 is the retaining ring 55, and the resilience force of the disc spring 53 also pushes the retaining ring 55 towards the upper sealing ring 52, realizing the seal between the upper valve seat 51 and the valve cover 3.

[0023] The upstream inclined surface 54 of the upper valve seat 51 is a cemented carbide surface, making the contact surface between the upper valve seat 51 and the ball 4 more durable and not easily damaged. The upper sealing ring is trapezoidal, which can be better assembled and connected to form an effective sealing effect.

[0024] The downstream sealing assembly 6 includes a lower valve seat 61 and a lower sealing ring 62. One side of the lower valve seat 61 is in contact connection with the valve body 1, and the other side of the lower valve seat 61 is in contact connection with the sphere 4. The lower sealing ring 62 is installed on the lower valve seat 61, and the lower sealing ring 62 is in contact connection with the valve body 1. The lower sealing ring 62 mainly realizes the sealing between the lower valve seat 61 and the sphere 4.

[0025] One side of the lower valve seat 61 is provided with a downstream inclined surface 63. The lower valve seat 61 is in contact connection with the sphere 4 through the downstream inclined surface 63. The downstream inclined surface is a cemented carbide surface, which increases durability. The lower sealing ring is trapezoidal, which realizes more convenient assembly.

[0026] After the whole valve is assembled, the disc spring has formed a compression amount and generated a spring force. The spring force pushes the upper valve seat towards the sphere, and the sphere then presses the lower valve seat towards the lower sealing ring on the back, first realizing the sealing of the lower valve seat. Due to the interaction of forces, the supporting surface of the disc spring is the pressure ring, and the spring force of the disc spring also pushes the pressure ring towards the stepped upper sealing ring, realizing the sealing between the upper valve seat and the valve cover.

[0027] When the valve is normally installed on the pipeline, it is preferred that the medium enters from one side of the upper valve seat (i.e., the side with the disc spring) and flows out from the lower valve seat (without the disc spring). At this time, even if part of the medium leaks from the upstream side to the inner cavity of the valve body, the medium pressure still acts on the back of the upper valve seat, and the provided pressure still pushes the upper valve seat towards the sphere, that is, a dynamic sealing effect is established, further ensuring the sealing of the valve. The medium will not leak from the upstream of the valve to the downstream.

[0028] It should be noted that the above is only the preferred embodiment of the present invention and is not used to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, for those skilled in the art, they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features. However, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A two-way sealed ball valve, comprising a valve body and a valve stem, characterized in that, The valve stem is inserted into the valve body. A valve cover is provided on the valve body. A sphere is provided inside the valve body. The valve stem is connected to the sphere. An upstream sealing assembly is provided on the upstream side of the sphere, and a downstream sealing assembly is provided on the downstream side of the sphere. One side of the upstream sealing assembly is in contact connection with the valve cover, and the other side of the upstream sealing assembly is in contact connection with the sphere. One side of the downstream sealing assembly is in contact connection with the valve body, and the other side of the downstream sealing assembly is in contact connection with the sphere. The upstream sealing assembly forms a lateral pressure on the sphere towards the downstream sealing assembly; The upstream sealing assembly includes an upper valve seat, an upper sealing ring and a disc spring. An upstream inclined surface is provided on one side of the upper valve seat. The upper valve seat contacts the sphere through the upstream inclined surface. One side of the upper sealing ring is connected to the upper valve seat, and the other side is connected to the valve cover. One side of the disc spring is connected to the valve cover, and the other side abuts against the upper valve seat. The disc spring is in a compressed state, and the disc spring presses on the upper valve seat to keep the upper valve seat pressing on the sphere with a top pressure; The downstream sealing assembly includes a lower valve seat and a lower sealing ring. One side of the lower valve seat is in contact connection with the valve body, and the other side of the lower valve seat is in contact connection with the sphere. The lower sealing ring is installed on the lower valve seat, and the lower sealing ring is in contact connection with the valve body.

2. The bi-directional sealed ball valve according to claim 1, characterized in that, A retaining ring is provided between the upper sealing ring and the disc spring. The retaining ring abuts against the upper sealing ring, and the disc spring abuts against the retaining ring.

3. The bi-directional seal ball valve according to claim 1, characterized in that, The upstream inclined surface of the upper valve seat is a cemented carbide surface, and the upper sealing ring is trapezoidal.

4. The bi-directional sealed ball valve according to claim 1, characterized in that, A downstream inclined surface is provided on one side of the lower valve seat. The lower valve seat contacts the sphere through the downstream inclined surface, and the downstream inclined surface is a cemented carbide surface.

5. The bi-directional seal ball valve according to claim 4, wherein, The lower sealing ring is trapezoidal.

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