A ball valve

Abstract

The present invention belongs to the field of valve technology and discloses a ball valve. The ball valve includes a valve body, which is provided with a flow channel and a storage space. The storage space is provided with a valve stem, a support ring, and an elastic member. The valve stem is disposed in the storage space. A first end of the valve stem is connected to a sphere, which is provided with a through hole corresponding to the flow channel. The sphere can open or close the flow channel. A sealing assembly is coated on the outside of the sphere. The sealing assembly is configured to seal the connection between the sphere and the valve body. A support ring is provided at the connection between the sphere and the flow channel. The support ring is used to support the sealing assembly. An elastic member is sleeved on the valve stem. One end of the elastic member is connected to the valve body and the other end is connected to the sealing assembly. The elastic member is configured to compress the sealing assembly to compensate for wear of the sealing assembly. The ball valve is easy to install and has high sealing stability, thereby improving the reliability and service life of the ball valve.

Description

Technical Field

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

[0002] Ball valves are widely used and provide quick closing. Currently, the most common sealing method for ball valves is achieved by a sealing cap that grips the spherical stem while simultaneously compressing the valve body. This simple structure makes it easy to seal. However, the problem is that the sealing cap can age and wear under alternating cycles of high and low ambient temperatures, or the temperature of the medium within the valve. This weakens the sealing force of the sealing cap against the spherical stem, leading to leakage.

[0003] Therefore, a ball valve is urgently needed to solve the problems in the prior art. Summary of the Invention

[0004] The object of the present invention is to provide a ball valve that can solve the problems of poor sealing reliability and short service life of ball valves in the prior art.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A ball valve, comprising:

[0007] a valve body, wherein the valve body is provided with a flow channel and a receiving space;

[0008] a valve stem disposed in the accommodating space, a sphere connected to a first end of the valve stem, the sphere being provided with a through hole corresponding to the flow channel, the sphere being capable of opening or closing the flow channel, the sphere being coated with a sealing assembly configured to seal a connection between the sphere and the valve body;

[0009] An elastic member is sleeved on the valve stem, one end of the elastic member is connected to the valve body and the other end is connected to the sealing assembly, and the elastic member is configured to compress the sealing assembly.

[0010] Optionally, a limiting groove is provided at the bottom of the valve body, a limiting boss is provided on one side of the sphere close to the bottom of the valve body, and the limiting boss is rotatably provided in the limiting groove.

[0011] Optionally, the elastic member is a disc spring.

[0012] Optionally, the sealing assembly includes a first valve seat and a second valve seat, and the first valve seat and the second valve seat are detachably connected.

[0013] Optionally, the ball valve further includes a support ring, which is provided at the connection between the ball and the flow channel, and is used to support the sealing assembly.

[0014] Optionally, a groove is provided at a position of the second valve seat corresponding to the flow channel, and the support ring is provided in the groove.

[0015] Optionally, the first valve seat and the second valve seat are both made of PTFE or TFM material.

[0016] Optionally, the ball valve further includes a gasket, which is sleeved on the valve stem, one end of the gasket is connected to the elastic member, and the other end is connected to the sealing assembly.

[0017] Optionally, the ball valve further includes a pressure cover, which is sleeved on the valve stem to press the elastic member into the accommodating space.

[0018] Optionally, the second end of the valve stem is detachably connected to a handle.

[0019] Beneficial effects:

[0020] The present invention provides not only a sealing assembly at the connection between the ball and the flow channel, but also an elastic part. The elastic part can press the sealing assembly onto the ball to achieve elastic compensation for wear. That is, during the use of the ball valve, after the sealing assembly is worn, the elastic force of the elastic part can still make the sealing assembly and the ball fit tightly together to ensure the sealing effect. The setting of the elastic part not only ensures the load requirement of the ball but also reduces the amount of sealing assembly used. In addition, the ball valve provided by the present invention is easy to install and has high sealing stability, thereby improving the reliability and service life of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a cross-sectional view of the ball valve provided by the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the structure enlarged at point A in the middle.

[0023] In the picture:

[0024] 1. Valve body; 11. Flow channel; 12. Accommodation space; 13. Limit groove;

[0025] 2. Valve stem; 21. Ball; 211. Limiting boss;

[0026] 3. Sealing assembly; 31. First valve seat; 32. Second valve seat;

[0027] 4. Support ring;

[0028] 5. Elastic parts;

[0029] 6. Gland;

[0030] 7. Gasket;

[0031] 8. Handle. DETAILED DESCRIPTION

[0032] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0033] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0034] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0035] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on those shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0036] like Figure 1As shown, this embodiment discloses a ball valve, which includes a valve body 1. A flow channel 11 and an accommodating space 12 are provided in the valve body 1. A valve stem 2, a support ring 4 and an elastic member 5 are provided in the accommodating space 12. The first end of the valve stem 2 is connected to the ball 21. The ball 21 is provided with a through hole corresponding to the flow channel 11. The ball 21 is driven to rotate by the valve stem 2 to open or close the flow channel 11. In order to ensure the sealing of the ball valve, a sealing component 3 is coated on the outside of the ball 21. The sealing component 3 is used to seal the connection between the ball 21 and the valve body 1 to prevent leakage. The setting of the sealing component 3 makes the ball valve do not require system pressure sealing in the pipeline where the ball valve is located during use, which can reduce potential leakage points. In addition, the ball valve allows two-way circulation, which is convenient for cleaning and washing the inside of the ball valve. The cam 2 is provided with an elastic member 5, which is sleeved on the valve stem 2. One end of the elastic member 5 is connected to the upper top wall of the accommodating space 12 of the valve body 1, and the other end is connected to the sealing assembly 3, which can reduce the demand of the ball valve ball 21 for packing (the packing in this embodiment is the sealing assembly 3). After the ball valve is installed, the elastic member 5 is in a compressed state. The rebound force of the elastic member 5 after being compressed can press the sealing assembly 3 onto the ball 21, while ensuring the load of the ball 21, compensating for the wear of the sealing assembly 3, thereby improving the reliability and sealing effect of the ball valve seal. After the sealing assembly 3 of the ball valve is worn, there is no need to remove the ball valve from the pipeline for maintenance. The compression state of the elastic member 5 can be directly adjusted to increase the pressing force of the elastic member 5 on the sealing assembly 3, which can ensure that the sealing assembly 3 continues to fit tightly with the ball 21, thereby improving the sealing performance of the ball valve.

[0037] It is understandable that during the use of the ball valve, the relative rotation between the ball 21 and the sealing assembly 3 will cause wear of the sealing assembly 3. After the contact portion of the sealing assembly 3 and the ball 21 is worn, the elastic force of the elastic member 5 can still press the sealing assembly 3 against the ball 21 to compensate for the worn portion of the sealing assembly 3, thereby improving the reliability of the seal and extending the service life of the ball valve.

[0038] Preferably, if Figure 1 and Figure 2 As shown, a limiting groove 13 is provided at the bottom of the valve body 1, and a limiting boss 211 is provided on the side of the ball 21 close to the bottom of the valve body 1. The limiting boss 211 is rotatably set in the limiting groove 13. The limiting groove 13 can ensure that the ball 21 is subjected to more uniform force, ensure the balance of the valve stem 2, and increase the stability of the seal.

[0039] Preferably, the elastic member 5 in this embodiment is a disc spring. Disc springs offer high load capacity, short travel, require minimal installation space, and are easier to maintain and replace. In other embodiments, the elastic member 5 may also be a straight spring or a resilient V-shaped or W-shaped spring. The type of elastic member is not specifically limited herein, as long as it can securely press the sealing assembly against the ball.

[0040] Further, if Figure 1 As shown, in this embodiment, the ball 21 and the valve stem 2 are integrally formed, and the sealing assembly 3 includes a first valve seat 31 and a second valve seat 32. The first valve seat 31 is sleeved on the valve stem 2 and is arranged closely to the upper surface of the ball 21. The second valve seat 32 is arranged around the outer peripheral wall of the ball 21. The second valve seat 32 is provided with an opening at a position corresponding to the flow channel 11 to ensure that the fluid can pass through the flow channel 11 smoothly. Specifically, the first valve seat 31 and the second valve seat 32 are detachably connected to facilitate installation of the sealing assembly 3.

[0041] Preferably, the ball valve in this embodiment also includes a support ring 4, which is arranged at the connection between the ball 21 and the flow channel 11. The support ring 4 is used to support the sealing assembly 3 to reduce the demand of the ball 21 on the sealing assembly 3. At the same time, the support ring 4 can also prevent the sealing assembly 3 from deformation.

[0042] Furthermore, a groove is provided at a position of the second valve seat 32 corresponding to the flow channel 11, and the support ring 4 is provided in the groove. The setting of the support ring 4 reduces the demand of the ball 21 for the second valve seat 32, and can provide good support for the second valve seat 32, thereby preventing the second valve seat 32 from deforming and affecting the sealing effect, thereby further improving the reliability of the seal.

[0043] Optionally, both the first valve seat 31 and the second valve seat 32 are made of PTFE (Poly tetra fluoroethylene) or TFM. PTFE is resistant to high temperatures and corrosion, has low water absorption, and exhibits strong wear and aging resistance. TFM is a composite fiber material made from PTFE with less than 1% additives. It is a modified PTFE with a melting point of 320-340°C. In addition to all the advantages of PTFE, it also offers some notable improvements, such as reduced deformation and permeability under high temperature and pressure, improved recovery under high pressure at high temperatures, and a very high surface finish, making it an excellent valve seat material.

[0044] Preferably, the ball valve also includes a gasket 7, which is sleeved on the valve stem 2. One end of the gasket 7 is connected to the disc spring and the other end is connected to the first valve seat 31. The setting of the gasket 7 can ensure that the first valve seat 31 is subjected to more uniform force and ensure the reliability of the sealing of the first valve seat 31.

[0045] Preferably, the ball valve further comprises a gland 6 , which is sleeved on the valve stem 2 to press the disc spring into the accommodating space 12 to ensure that the disc spring can provide good elastic force to the first valve seat 31 to compensate for wear.

[0046] Alternatively, as Figure 1 As shown, the second end of the valve stem 2 is detachably connected to a handle 8, which facilitates rotating the valve stem 2 by the handle 8 to drive the ball 21 to open or close the flow channel 11. It should be noted that the handle 8 is snap-fitted or threadedly connected to the valve stem 2. The specific connection method can be selected according to actual needs and is not specifically limited here.

[0047] Optionally, interfaces are provided at both ends of the flow channel 11 for quick connection to a pipeline. Specifically, internal threads can be provided on the valve body 1 at both ends of the flow channel 11 to facilitate connection to a pipeline with external threads, or latches can be provided on the valve body 1 at both ends of the flow channel 11 to facilitate quick connection to the pipeline.

[0048] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A ball valve, characterized in that: include: A valve body (1), wherein the valve body (1) is provided with a flow channel (11) and a receiving space (12); A valve stem (2) is arranged in the accommodating space (12), a first end of the valve stem (2) is connected to a sphere (21), a through hole corresponding to the flow channel (11) is provided on the sphere (21), the sphere (21) is capable of opening or closing the flow channel (11), and the sphere (21) is covered with a sealing assembly (3), and the sealing assembly (3) is configured to seal the connection between the sphere (21) and the valve body (1); an elastic member (5) sleeved on the valve stem (2), one end of the elastic member (5) being connected to the valve body (1), and the elastic member (5) being configured to compress the sealing assembly (3); The sphere (21) and the valve stem (2) are integrally formed, and the sealing assembly (3) comprises a first valve seat (31) and a second valve seat (32). The first valve seat (31) is sleeved on the valve stem (2) and is arranged closely on the upper surface of the sphere (21). The second valve seat (32) is arranged around the outer peripheral wall of the sphere (21), and an opening is provided at a position of the second valve seat (32) corresponding to the flow channel (11). The first valve seat (31) and the second valve seat (32) are detachably connected. The ball valve further comprises a gasket (7), which is sleeved on the valve stem (2), one end of the gasket (7) is connected to the elastic member (5), and the other end is connected to the first valve seat (31).

2. The ball valve according to claim 1, characterized in that A limiting groove (13) is provided at the bottom of the valve body (1), and a limiting boss (211) is provided on one side of the sphere (21) close to the bottom of the valve body (1), and the limiting boss (211) is rotatably arranged in the limiting groove (13).

3. The ball valve according to claim 1, characterized in that The elastic member (5) is a disc spring.

4. The ball valve according to claim 1, characterized in that The ball valve further comprises a support ring (4), wherein the support ring (4) is arranged at the connection between the ball (21) and the flow channel (11), and the support ring (4) is used to support the sealing assembly (3).

5. The ball valve according to claim 4, characterized in that: A groove is provided at a position of the second valve seat (32) corresponding to the flow channel (11), and the support ring (4) is arranged in the groove.

6. The ball valve according to claim 1, characterized in that The first valve seat (31) and the second valve seat (32) are both made of PTFE or TFM material.

7. The ball valve according to claim 1, characterized in that The ball valve further comprises a pressure cover (6), and after the pressure cover (6) is sleeved on the valve stem (2), the elastic member (5) is pressed tightly into the accommodating space (12).

8. The ball valve according to any one of claims 1 to 6, characterized in that: The second end of the valve stem (2) is detachably connected to a handle (8).

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