Soft seal ball valve

Abstract

The utility model relates to the technical field of valves, in particular to a soft sealing ball valve. Comprising a valve body and a valve seat, the valve body is connected with a valve side body through a nut, the valve seat is arranged between the valve body and the valve side body, a protective sleeve is arranged at the upper end of the valve body, a ball is arranged in the valve body, a groove is formed in the upper portion of the ball, a valve rod rotationally connected with the ball is arranged in the protective sleeve, and the lower end of the valve rod is arranged in the groove. A medium drainage channel and a sealing face are arranged on the surface of the ball body, conveying pipelines communicated with the medium drainage channel are arranged at the two ends of the valve side body, and a compression device for improving the sealing performance of the ball body is arranged in the valve body. The fluid enters the medium drainage channel in the valve body through the conveying pipeline, part of the fluid enters the flow dividing pipeline, the pressing plate can be pushed under the pressure effect of the fluid to continuously press the sealing gasket, and therefore the situation that the sealing performance of the valve body is reduced due to thermal expansion and cold contraction of the sealing gasket can be avoided even if the low-temperature fluid is conveyed.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a soft-seal ball valve. Background Technology

[0002] Soft-seal high-pressure ball valves are key devices for controlling fluid flow and are widely used in industries such as petroleum, chemical, natural gas, and power. They are characterized by high temperature resistance, corrosion resistance, and wear resistance, enabling reliable operation under high pressure, high temperature, and harsh environments. However, despite the many advantages of soft-seal ball valves, their sealing performance has some issues that cannot be ignored, especially under certain specific operating conditions.

[0003] The physicochemical properties of soft sealing materials limit their application under extreme conditions. For example, PTFE (polytetrafluoroethylene), a commonly used soft sealing material, may become brittle and prone to breakage in low-temperature environments, failing to guarantee an effective seal. Furthermore, in low-temperature environments, gaps may form between the ball and the gasket due to thermal contraction, reducing sealing performance. Therefore, a soft-seal ball valve is needed that maintains high sealing performance and stability even in low-temperature environments. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a soft-seal ball valve to address the above-mentioned defects.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: A soft-seal ball valve includes a valve body and a valve seat. The valve body is connected to a valve side body by a nut. The valve seat is disposed between the valve body and the valve side body. A protective sleeve is provided at the upper end of the valve body. A ball is disposed inside the valve body. A groove is provided above the ball. A valve stem is disposed inside the protective sleeve and rotatably connected to the ball. The lower end of the valve stem is disposed in the groove. A medium drainage channel and a sealing surface are provided on the surface of the ball. Both ends of the valve side body are provided with conveying pipes connected to the medium drainage channel. A compression device to improve the sealing performance of the ball is provided inside the valve body. A clamping device to improve the sealing performance of the valve body is provided between the protective sleeve and the valve body.

[0006] Furthermore, the compression device includes a diversion pipe connected to the delivery pipe, a compression spring installed in the diversion pipe, and a pressure plate fixedly installed on one side of the compression spring. The pressure plate is located at the end of the compression spring near the ball, and a sealing gasket is provided at the end of the valve seat near the ball. The pressure plate and the sealing gasket are located on the same horizontal plane, and the sealing gasket is made of PPL material or RPTFE material.

[0007] Furthermore, the clamping device includes a first cover plate, a second cover plate, and an O-ring sequentially fitted onto the valve stem. A compression packing is provided between the first cover plate and the second cover plate. An antistatic ball and a connecting spring are provided on the O-ring. The connecting spring is fixedly connected to the O-ring. One end of the antistatic ball is fixedly connected to the connecting spring, and the other end contacts the inner wall of the valve body. A disc spring is provided on the first cover plate, and a bolt seat is provided above the disc spring.

[0008] Furthermore, the valve body and the valve side body are fixedly connected by bolts.

[0009] The beneficial effects of this utility model are:

[0010] 1. This utility model incorporates a compression device, which includes a diversion pipe connected to the delivery pipe, a compression spring installed within the diversion pipe, and a pressure plate fixedly mounted on one side of the compression spring. When the ball valve is closed, the compression spring in the diversion pipe pushes the pressure plate, causing the pressure plate to press tightly against the sealing gasket, thus improving the sealing performance of the gasket. When the ball valve is operating, fluid enters the medium guide channel within the valve body through the delivery pipe, and a portion of the fluid enters the diversion pipe. Under the pressure of the fluid, this pushes the pressure plate to further press the sealing gasket, resulting in even better sealing performance. This prevents the sealing gasket from reducing the valve body's sealing performance due to thermal expansion and contraction, even when transmitting low-temperature fluids. Furthermore, the diversion device effectively alleviates some of the pressure within the valve body, improving the stability and safety performance of the valve.

[0011] 2. This utility model incorporates a clamping device, comprising a first cover plate, a second cover plate, and an O-ring sequentially fitted onto the valve stem. A disc spring is mounted on the first cover plate, and a bolt seat is positioned above the disc spring. The packing material employs a V-shaped sealing structure, further enhancing sealing performance. The disc spring, positioned above the first cover plate and with the bolt seat above it, allows the disc spring to continuously apply pressure to the first cover plate through pre-tightening of the bolt seat, thereby further improving the sealing performance of the packing material and enhancing the valve body's leak-proof capability. Attached Figure Description

[0012] The foregoing and other objects, features and advantages of this invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

[0013] Figure 1 This is a front sectional view of the present invention.

[0014] Figure 2 This is an enlarged schematic diagram of part A of this utility model.

[0015] Wherein: 1 is valve body, 2 is valve seat, 3 is valve side body, 4 is protective sleeve, 5 is ball, 6 is valve stem, 7 is delivery pipe, 8 is diversion pipe, 9 is compression spring, 10 is pressure plate, 11 is sealing gasket, 12 is first cover plate, 13 is second cover plate, 14 is O-ring, 15 is compression packing, 16 is antistatic ball, 17 is connecting spring, 18 is disc spring, and 19 is bolt seat. Detailed Implementation

[0016] The present invention will be further described below with reference to the accompanying drawings.

[0017] Reference Figure 1-2 As shown, a soft-seal ball valve includes a valve body 1 and a valve seat 2. The valve body 1 is connected to a valve side body 3 by a nut. The valve seat 2 is located between the valve body 1 and the valve side body 3. A protective sleeve 4 is provided at the upper end of the valve body 1. A ball 5 is provided inside the valve body 1. A groove is provided above the ball 5. A valve stem 6 is provided inside the protective sleeve 4 and is rotatably connected to the ball 5. The lower end of the valve stem 6 is located in the groove. A medium drainage channel and a sealing surface are provided on the surface of the ball 5. Both ends of the valve side body 3 are provided with conveying pipes 7 that are connected to the medium drainage channel. A compression device to improve the sealing performance of the ball 5 is provided inside the valve body 1. A clamping device to improve the sealing performance of the valve body 1 is provided between the protective sleeve 4 and the valve body 1.

[0018] Furthermore, the compression device includes a diversion pipe 8 connected to the delivery pipe 7, a compression spring 9 disposed within the diversion pipe 8, and a pressure plate 10 fixedly disposed on one side of the compression spring 9. The pressure plate 10 is disposed at the end of the compression spring 9 near the ball 5, and a sealing gasket 11 is disposed at the end of the valve seat 2 near the ball 5. The pressure plate 10 and the sealing gasket 11 are located on the same horizontal plane, and the sealing gasket 11 is made of PPL or RPTFE material. These materials have good wear resistance, pressure resistance, and high temperature resistance, and can adapt to more complex working environments.

[0019] Furthermore, the clamping device includes a first cover plate 12, a second cover plate 13, and an O-ring 14 sequentially sleeved on the valve stem 6. A compression packing 15 is provided between the first cover plate 12 and the second cover plate 13. An antistatic ball 16 and a connecting spring 17 are provided on the O-ring 14. The connecting spring 17 is fixedly connected to the O-ring 14. One end of the antistatic ball 16 is fixedly connected to the connecting spring 17, and the other end is in contact with the inner wall of the valve body 1. A disc spring 18 is provided on the first cover plate 12, and a bolt seat 19 is provided above the disc spring 18.

[0020] Furthermore, the valve body 1 and the valve side body 3 are fixedly connected by bolts.

[0021] In this embodiment of the utility model, please refer to Figure 1-2The working principle is as follows: When the ball valve is closed, the spring 9 in the diversion pipe 8 pushes the pressure plate 10, causing the pressure plate 10 to press the sealing gasket 11 tightly, thus improving the sealing performance of the sealing gasket 11. When the ball valve is working, the fluid enters the medium guiding channel of the valve body through the delivery pipe 7, and a portion of the fluid enters the diversion pipe 8. Under the pressure of the fluid, the pressure plate 10 is pushed to continue pressing the sealing gasket 11 tightly, making the sealing performance of the sealing gasket 11 even better. In this way, even when transmitting low-temperature fluids, the sealing performance of the sealing gasket 11 can be avoided due to thermal expansion and contraction. At the same time, the diversion device can effectively relieve some of the pressure inside the valve body 1, improving the stability and safety performance of the valve body 1. A compression packing 15 is provided between the first cover plate 12 and the second cover plate 13. The compression packing 15 adopts a V-shaped sealing structure, which can further improve the sealing performance. A disc spring 18 is provided above the first cover plate 12, and a bolt seat 19 is provided above the disc spring 18. Through the pre-tightening of the bolt seat 19, the disc spring 18 can continuously apply pressure to the first cover plate 12, further improving the sealing performance of the compression packing 15 and improving the anti-leakage capability of the valve body 1. The antistatic ball 16 provided on the O-ring 14 can transfer the static electricity in the valve body 1 to the connecting spring 17, then to the valve stem 6, and finally to the outside of the valve body 1 for grounding, thereby improving the safety performance of the valve body 1.

[0022] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying 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, they should not be construed as limitations on this utility model.

[0023] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0024] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A soft-seal ball valve comprising a valve body and a valve seat, characterized in that: The valve body is connected with a valve side body through a nut, a valve seat is arranged between the valve body and the valve side body, a protective sleeve is arranged at the upper end of the valve body, a ball is arranged in the valve body, a groove is arranged above the ball, a valve rod is arranged in the protective sleeve and rotationally connected with the ball, the lower end of the valve rod is arranged in the groove, the surface of the ball is provided with a medium flow channel and a sealing surface, both ends of the valve side body are provided with a delivery pipeline in communication with the medium flow channel, a compression device for improving the sealing performance of the ball is arranged in the valve body, and a clamping device for improving the sealing performance of the valve body is arranged between the protective sleeve and the valve body.

2. A soft-seal ball valve according to claim 1, characterized in that: The compression device comprises a shunt pipeline in communication with the delivery pipeline, a compression spring arranged in the shunt pipeline, and a pressing plate fixedly arranged on one side of the compression spring, the pressing plate is arranged at the end of the compression spring close to the ball, the end of the valve seat close to the ball is provided with a sealing gasket, the pressing plate and the sealing gasket are located on the same horizontal plane, and the sealing gasket is made of PPL material or RPTFE material.

3. A soft-seal ball valve according to claim 1, characterized in that: The clamping device comprises a first cover plate, a second cover plate and an O-shaped ring which are sequentially arranged on the valve rod, a compression packing is arranged between the first cover plate and the second cover plate, an anti-static ball and a connecting spring are arranged on the O-shaped ring, the connecting spring is fixedly connected with the O-shaped ring, one end of the anti-static ball is fixedly connected with the connecting spring and the other end is in contact with the inner wall of the valve body, a disc spring is arranged on the first cover plate, and a bolt seat is arranged above the disc spring.

4. A soft-seal ball valve according to claim 1, characterized in that: The valve body and the valve side body are fixedly connected through bolts.

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