Double block double bleed ball valve

Abstract

The utility model discloses a kind of double-plugging double-discharge ball valves, relate to valve technical field, including valve body, the upper end fixed installation of valve body also has two groups of fixed seat, the inside of valve body is provided with two groups of ball valves, the upper surface of two groups of ball valves is all installed with valve stem and is penetrated, the upper surface of valve body is installed with two groups of detachable support box body.The utility model, when valve is closed, reliable plugging to upstream and downstream medium of valve is simultaneously realized, i.e. double-plugging function, effectively prevent medium leakage, improve the sealing performance and security of valve, simultaneously, the self-locking of worm wheel and worm is recycled, ball valve can be prevented from being impacted by fluid and moving inside valve body, ensure the stability of long-term operation of valve, secondly, single rotating column can control two groups of ball valve actions, reduce the complexity of multiple handle operation of traditional double-ball valve structure, reduce artificial operation failure probability.

Description

Technical Field

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

[0002] In industries such as petroleum, chemical, and natural gas, the safe and stable operation of fluid transport systems is crucial. Valves, as key control components in these systems, directly impact the overall system's efficiency and safety through their sealing and safety performance. In high-risk scenarios, such as deep-sea oil and gas extraction and the transport of flammable and explosive chemical raw materials, valve leakage can not only lead to resource waste but also potentially trigger serious safety accidents such as fires, explosions, and poisoning, posing a significant threat to human life and the environment.

[0003] However, in the existing technology, most traditional ball valves are single-seal structures. When closed, they can only block the medium at one end of the valve, either upstream or downstream, and cannot effectively isolate the upstream and downstream media at the same time. When the pipeline system needs to be inspected or isolated in sections, or when a section of the system needs to be pressure isolated, single-seal ball valves are difficult to meet the requirements and there is a risk of media crossflow. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art by proposing a double-blocking double-discharge ball valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a double-blocking double-discharge ball valve, comprising a valve body, two sets of fixed seats fixedly installed at the upper end of the valve body, two sets of ball valves arranged inside the valve body, valve stems being installed through the upper surfaces of both sets of ball valves, two sets of detachable support boxes being installed on the upper surface of the valve body, a rotating column being arranged in the middle of the two sets of support boxes, a worm gear and a connecting shaft being rotatably installed inside the two sets of support boxes, and a worm wheel being fixedly installed on the outer wall of each set of connecting shafts.

[0006] Preferably, both sets of valve stems are rotatably installed inside the valve body, and one end of each set of worm gears passes through one end of each set of support boxes and is fixed to both ends of the rotating column.

[0007] Preferably, the two sets of worm gears mesh with the two sets of worms, and the upper ends of the two sets of valve stems penetrate the upper surface of the valve body and are disposed inside the two sets of fixed seats.

[0008] Preferably, the lower ends of the two sets of connecting shafts pass through the lower ends of the two sets of support boxes and are fixed to the upper ends of the two sets of valve stems.

[0009] Preferably, a discharge pipe is installed through the lower end of the valve body, and the discharge pipe is located in the middle of the internal cavity of the valve body, and a discharge valve is installed at the lower end of the discharge pipe.

[0010] Preferably, two sets of support ring seats are symmetrically installed inside the valve body, and the outer walls of both sets of ball valves are provided with annular sealing grooves.

[0011] Preferably, both sets of annular sealing grooves are inlaid with elastic sealing rings, and the outer walls of both sets of elastic sealing rings are in contact with the inner wall of the valve body.

[0012] Compared with the prior art, the advantages and positive effects of this utility model are as follows: 1. In this utility model, with the cooperation of the rotating column, worm gear, worm, connecting shaft, valve stem, and ball valve, reliable sealing of the upstream and downstream media can be achieved simultaneously when the valve is closed, i.e., double-blocking function, which effectively prevents media leakage and improves the sealing performance and safety of the valve. At the same time, by utilizing the self-locking property of the worm gear and worm, the ball valve can be prevented from moving inside the valve body due to fluid impact, ensuring the long-term stability of the valve operation. Furthermore, a single rotating column can control the action of two sets of ball valves, reducing the complexity of multi-handle operation in the traditional double ball valve structure and reducing the probability of human operation error. 2. In this utility model, a discharge pipe is installed on the outer wall of the valve body, which is connected to the middle cavity. A discharge valve is installed at the lower end of the discharge pipe. When the valve needs to be maintained or repaired, or when the pressure in the middle cavity is abnormal, the discharge valve can be opened to discharge the medium in the middle cavity, thus realizing a dual discharge function. This facilitates valve maintenance and reduces safety risks. 3. In this utility model, a combination structure is constructed by installing support ring seats at both the upstream and downstream ends of the valve body, and setting elastic sealing rings on the outer walls of two sets of ball valves. The elastic sealing rings are made of polytetrafluoroethylene, which has good sealing performance and corrosion resistance. The support ring seats are made of stainless steel, which provides support for the elastic sealing rings and ensures the stability of the sealing structure. At the same time, the inner part of the elastic sealing ring is embedded in the annular sealing groove of the ball, which further improves the sealing effect. Attached Figure Description

[0013] Figure 1 A three-dimensional structural diagram of a double-blocking, double-discharge ball valve is provided for this utility model; Figure 2 This utility model provides a partial half-sectional structural diagram of a double-blocking double-discharge ball valve; Figure 3 This utility model provides a schematic diagram of the structure of a double-blocking double-discharge ball valve, including the ball valve, valve stem, worm gear, and worm. Figure 4 A side view of a double-block, double-discharge ball valve is provided for this utility model.

[0014] Legend: 1. Valve body; 11. Discharge pipe; 12. Discharge valve; 13. Support ring seat; 14. Fixed seat; 15. Ball valve; 16. Elastic sealing ring; 17. Valve stem; 18. Annular sealing groove; 2. Support box; 21. Rotating column; 22. Worm; 23. Worm wheel; 24. Connecting shaft. Detailed Implementation

[0015] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0016] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0017] Example 1: As Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this utility model provides a double-blocking double-discharge ball valve, including a valve body 1. Two sets of fixed seats 14 are fixedly installed on the upper end of the valve body 1. Two sets of ball valves 15 are arranged inside the valve body 1. A valve stem 17 is installed through the upper surface of each set of ball valves 15. Two detachable support boxes 2 are installed on the upper surface of the valve body 1. A rotating column 21 is arranged between the two sets of support boxes 2. A worm gear 22 and a connecting shaft 24 are rotatably installed inside each set of support boxes 2. A worm wheel 23 is fixedly installed on the outer wall of each connecting shaft 24. Both sets of valve stems 17 are rotatably installed on the valve body. Inside valve body 1, one end of each of the two sets of worm gears 22 passes through one end of each of the two sets of support housings 2 and is fixed to both ends of the rotating column 21. Two sets of worm wheels 23 mesh with the two sets of worm gears 22. The upper ends of the two sets of valve stems 17 pass through the upper surface of valve body 1 and are set inside the two sets of fixed seats 14. The lower ends of the two sets of connecting shafts 24 pass through the lower ends of the two sets of support housings 2 and are fixed to the upper ends of the two sets of valve stems 17. A discharge pipe 11 is installed through the lower end of valve body 1 and is located in the center of the internal cavity of valve body 1. A discharge valve 12 is installed at the lower end of the discharge pipe 11.

[0018] The specific setup and function of this embodiment are described below. Two sets of symmetrically arranged fixed seats 14 are fixedly installed on the upper surface of the valve body 1. Two sets of ball valves 15 are correspondingly arranged inside the valve body 1. A valve stem 17 is installed through the upper surface of each set of ball valves 15, and the valve stem 17 is rotatably connected to the inside of the valve body 1. Two sets of detachable support boxes 2 are installed on the upper surface of the valve body 1. A rotating column 21 is set between the two sets of support boxes 2. A worm gear 22 and a connecting shaft 24 are rotatably installed in each set of support boxes 2. One end of the two sets of worm gears 22 is fixedly connected to both ends of the rotating column 21 to form a linkage structure. A worm wheel 23 is fixedly installed on the outer wall of each set of connecting shafts 24, and the worm wheel 23 meshes with the worm gear 22 for transmission. The upper ends of the two sets of valve stems 17 penetrate the valve body 1 and are embedded inside the fixed seats 14. The lower ends of the connecting shafts 24 penetrate the support boxes 2 and are fixedly connected to the upper ends of the valve stems 17. By rotating the rotating column 21, the worm gears 22 at both ends are driven to rotate synchronously within the support housing 2. The worm gears 22 drive the meshing worm wheel 23 to rotate, which in turn drives the connecting shaft 24 to rotate. The connecting shaft 24 drives the two sets of ball valves 15 to rotate synchronously by 90° through the valve stem 17, thereby opening or closing the valves. When the ball valves 15 rotate to the closed position, the two sets of ball valves 15 contact the two sets of support ring seats 13 respectively, forming a double-block seal. The self-locking characteristics of the worm wheel 23 and the worm gear 22 can prevent the ball valves 15 from rotating abnormally within the valve body 1 due to the impact of medium pressure, ensuring a stable sealing state. An independent discharge pipe 11 is provided on the outer wall of the valve body 1. The discharge pipe 11 is precisely connected to the inner cavity of the valve body 1 through a connecting hole that penetrates vertically through the side wall of the valve body 1, forming a stable medium flow channel. The lower end of the discharge pipe 11 is connected by a thread or flange to install a discharge valve 12. The discharge valve 12 is preferably a gate valve or a needle valve, which has high-precision flow control capability. The diameter of the discharge pipe 11 is customized according to the valve diameter and operating pressure to ensure structural strength under high pressure environment. When the valve needs to be maintained or repaired or the pressure in the cavity is abnormal, the discharge valve 12 can be opened to discharge the medium in the inner cavity of the valve body 1, realizing dual discharge function, which facilitates valve maintenance and reduces safety risks. Compared with the traditional built-in discharge structure, it can achieve higher flow rate medium discharge, shorten discharge time, and reduce the time operators are exposed to dangerous environments. At the same time, the independent discharge channel design avoids the erosion damage of the valve's internal sealing structure by the medium during the discharge process. Example 2: Figure 1 , Figure 2 and Figure 4 As shown, two sets of support ring seats 13 are symmetrically installed inside the valve body 1. The outer walls of the two sets of ball valves 15 are provided with annular sealing grooves 18. The inner walls of the two sets of annular sealing grooves 18 are inlaid with elastic sealing rings 16, and the outer walls of the two sets of elastic sealing rings 16 are in contact with the inner wall of the valve body 1.

[0019] The overall effect of this embodiment is that two sets of support ring seats 13 are symmetrically arranged inside the valve body 1. They are made of stainless steel using precision casting technology. The outer walls of both sets of ball valves 15 are provided with annular sealing grooves 18 to fit and install elastic sealing rings 16 made of polytetrafluoroethylene. The inner side of the rings 16 is precision machined into a stepped structure that matches the annular sealing grooves 18, with an embedding depth of 2 / 3 of the groove depth. The outer side is tightly fitted to the inner wall of the valve body 1 through an interference fit. The stepped nested structure of the support ring seats 13 and the elastic sealing rings 16 makes the sealing pressure distribution more uniform. In addition, the stainless steel support ring seats 13 have anti-erosion and anti-corrosion properties, effectively extending the service life of the sealing components.

[0020] The usage method and working principle of this device are as follows: First, install the valve body 1 in a suitable position. When it is necessary to operate the valve, rotate the rotating column 21 located between the two sets of support boxes 2. The rotating column 21 drives the worm gear 22, which is fixedly connected at both ends, to rotate synchronously in the support box 2. The meshing transmission between the worm gear 22 and the worm wheel 23 transmits the rotational force to the connecting shaft 24. The lower end of the connecting shaft 24 is fixed to the valve stem 17, thereby driving the two sets of ball valves 15 inside the valve body 1 to rotate synchronously by 90°. Open state: The connecting hole inside the ball valve 15 is fully aligned with the fluid passage of the valve body 1. At this time, the annular sealing groove 18 of the two sets of ball valves 15 is no longer in close contact with the elastic sealing ring 16, and the medium can pass smoothly through the valve to realize fluid conduction. In the closed state: the ball valve 15 rotates to the position of blocking the fluid passage. The annular sealing grooves 18 of the two sets of ball valves 15 are tightly fitted with the upstream and downstream elastic sealing rings 16 respectively. The outer side of the elastic sealing ring 16 is fitted with the inner wall of the valve body 1 through interference fit, and the inner stepped structure extends into the annular sealing groove 18 to form a double sealing barrier, effectively blocking the flow of the medium upstream and downstream of the valve and achieving the "double blocking" function. At the same time, the self-locking characteristics of the worm wheel 23 and worm 22 prevent the ball valve 15 from rotating due to the impact of the medium, ensuring the stability of the closed state. Then, during the rotation of the ball valve 15, the elastic sealing ring 16 made of polytetrafluoroethylene, with its good elastic deformation ability, always maintains close contact with the inner wall of the valve body 1 and the annular sealing groove 18 of the ball valve 15, providing stable support for the elastic sealing ring 16, limiting its radial displacement, and avoiding sealing failure due to compression deformation. In high-temperature environments, the chemical stability of polytetrafluoroethylene ensures that the sealing performance does not decrease; the stainless steel support ring seat 13 serves as a heat conduction path, balancing heat distribution and preventing local overheating. In media environments containing particulate impurities, the erosion resistance of the support ring seat 13 protects the elastic sealing ring 16 and extends the service life of the sealing assembly. Finally, when the valve is running, the discharge pipe 11 and the discharge valve 12 are in the closed state, and the medium pressure in the middle cavity is blocked by the upstream and downstream sealing structures. When maintenance and repair are required, and the valve needs to be disassembled or the internal components need to be inspected, the discharge valve 12 can be opened with special tools.

[0021] The above are merely preferred embodiments of this utility model and are not intended to limit the utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of this utility model without departing from the technical solution of this utility model shall still fall within the protection scope of this utility model.

Claims

1. A double-plug double-discharge ball valve, comprising a valve body (1), characterized in that: The upper end of the valve body (1) is also fixedly installed with two sets of fixed seats (14). The valve body (1) is equipped with two sets of ball valves (15). The upper surface of the two sets of ball valves (15) is through-mounted with valve stems (17). The upper surface of the valve body (1) is equipped with two sets of detachable support boxes (2). The middle of the two sets of support boxes (2) is provided with a rotating column (21). The worm gear (22) and connecting shaft (24) are rotatably installed inside the two sets of support boxes (2). The outer wall of each set of connecting shafts (24) is fixedly installed with a worm wheel (23).

2. The double-plug double-discharge ball valve according to claim 1, characterized in that: Both sets of valve stems (17) are rotatably installed inside the valve body (1). One end of each of the two sets of worm gears (22) passes through one end of each of the two sets of support boxes (2) and is fixed to both ends of the rotating column (21).

3. The double-plug double-discharge ball valve according to claim 2, characterized in that: The two sets of worm gears (23) mesh with the two sets of worms (22), and the upper ends of the two sets of valve stems (17) penetrate the upper surface of the valve body (1) and are set inside the two sets of fixed seats (14).

4. A double-plug double-discharge ball valve according to claim 3, characterized in that: The lower ends of the two sets of connecting shafts (24) pass through the lower ends of the two sets of support boxes (2) respectively, and are fixed to the upper ends of the two sets of valve stems (17).

5. A double-plug double-discharge ball valve according to claim 1, characterized in that: The lower end of the valve body (1) is provided with a discharge pipe (11), and the discharge pipe (11) is located in the middle of the inner cavity of the valve body (1). The lower end of the discharge pipe (11) is provided with a discharge valve (12).

6. The double-plug double-discharge ball valve according to claim 1, characterized in that: The valve body (1) is symmetrically equipped with two sets of support ring seats (13), and the outer walls of the two sets of ball valves (15) are provided with annular sealing grooves (18).

7. A double-plug double-discharge ball valve according to claim 6, characterized in that: Both sets of annular sealing grooves (18) are inlaid with elastic sealing rings (16), and the outer walls of both sets of elastic sealing rings (16) are in contact with the inner wall of the valve body (1).

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