A method for the decontamination of pipelines containing toxic media

Abstract

The application belongs to the field of hydraulic valves, and particularly relates to a pipeline blowdown method for conveying toxic medium, which comprises the following steps: S1, detecting whether the pipeline needs to be blowed down; S2, if yes, opening a blowdown ball valve and a blowdown port; S3, after blowdown is completed, detecting the sealing performance of the blowdown ball valve; and S4, after detection is completed, closing the blowdown ball valve. The pipeline blowdown method can improve the sealing performance of the blowdown ball valve and the safety and reliability when conveying the toxic medium.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valves, and specifically relates to a method for draining pipelines containing toxic media. Background Technology

[0002] When pipelines transport media for extended periods, scale typically accumulates inside. In such cases, a drain valve is needed to drain the pipeline. Existing drain ball valves have a simple structure and are only suitable for ordinary, non-toxic media. Their end connection structure and sealing performance are insufficient for transporting toxic media. Therefore, when pipelines are used to transport toxic media, using a conventional drain ball valve for draining can easily lead to toxic media leakage during the draining process, potentially causing injury or death. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a pipeline sewage discharge method for conveying toxic media, which can improve the sealing performance of the sewage ball valve and the safety and reliability when conveying toxic media.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0005] A method for draining a pipeline containing a toxic medium, wherein a drain ball valve is installed on the pipeline valve, the drain ball valve comprising a main valve body and a side valve body, the main valve body comprising a first ball, a second ball and a valve seat, a valve stem being drivenly connected to both the first ball and the second ball, an operating handle being drivenly connected to the valve stem, one end of the main valve body being sealed to the pipeline valve and the other end being sealed to the side valve body, and a plug being installed at one end of the side valve body;

[0006] One end of the side valve body is provided with a plug mounting hole, a guide groove and a third mounting groove in sequence. The inner circumference of the plug mounting hole is provided with an internal thread, and the outer circumference of the plug is provided with an external thread. The plug is threadedly connected to the plug mounting hole.

[0007] Within the guide groove, a leak detection hole and a flushing hole are respectively formed radially along the guide groove. A detection component is connected to the end of the leak detection hole. A fourth sealing element is installed in the third mounting groove. A flushing component is connected to the end of the flushing hole. When the plug is assembled into the plug mounting hole, a guide gap exists between one side of the plug and the guide groove.

[0008] The pipeline sewage discharge method includes the following steps:

[0009] S1: Check if the pipeline needs to be drained;

[0010] S2: If so, open the drain ball valve and drain port;

[0011] S3: After the sewage discharge is completed, test the sealing performance of the sewage ball valve;

[0012] S4: Close the drain ball valve after the test is completed.

[0013] Preferably, step S1 includes: detecting whether the residual dirt in the pipe reaches a predetermined sewage discharge threshold; if the residual dirt in the pipe reaches the predetermined sewage discharge threshold, then the pipe needs to be drained; otherwise, no sewage discharge is required.

[0014] Preferably, the sealing includes an outer sealing and an inner sealing, the outer sealing is threadedly connected to the plug mounting hole, the outer sealing has a through drain hole, and the inner sealing is installed in the drain hole provided in the outer sealing;

[0015] An injection cavity is formed between the outer seal and the inner seal. An injection channel is provided in the axial direction of the inner seal, and the injection channel communicates with the injection cavity. A fifth sealing element is also provided between the outer seal and the inner seal.

[0016] Preferably, when a pipeline drainage operation is required, step S2 includes:

[0017] S21: Unscrew the inner plug from the outer plug, rotate the operating handle, and rotate the first ball and the second ball to the open position respectively, so that the drain hole in the outer plug is connected to the fluid channel in the drain ball valve until the drain operation is completed;

[0018] S22: After the sewage discharge operation is completed, rotate the operating handle to rotate the first ball and the second ball to the closed position respectively;

[0019] S23: Screw the inner plug into the outer plug so that the inner plug and the fifth sealing element are in a sealed contact state. Control the glue injection assembly to inject sealant into the glue injection channel so that the sealant enters the glue injection cavity through the glue injection channel to seal the gap between the outer plug and the inner plug.

[0020] Preferably, the sealing performance test of the drain ball valve includes the following steps:

[0021] S31: First, loosen the outer plug until the guide gap is connected to the fluid channel inside the drain ball valve. Control the flushing component to introduce inert gas into the main valve body through the flushing hole. The detection component determines whether the content of toxic medium discharged from the main valve body through the guide gap exceeds a first predetermined threshold. If it exceeds the first predetermined threshold, it is determined that the seal between the ball and the valve seat inside the drain ball valve has failed. Otherwise, it is determined that the seal between the ball and the valve seat inside the drain ball valve is normal.

[0022] S32: Subsequently, tighten the outer plug so that the outer plug and the fourth sealing element are in a sealed contact state. Rotate the operating handle to rotate the first ball and the second ball to the open position respectively. The detection component determines whether the content of toxic medium discharged from the main valve body through the guide gap exceeds the second predetermined threshold. If it exceeds the second predetermined threshold, it is determined that the sealing of the fourth sealing element has failed; otherwise, it is determined that the sealing of the fourth sealing element is normal.

[0023] Preferably, the drain hole includes an inner sealing hole and a tapered screw hole connected in sequence; the inner sealing hole includes a second operating end, a first connecting section, an inner sealing section, a second connecting section, and a tapered thread section connected in sequence. When the inner sealing hole is installed in the outer sealing hole, the inner sealing section cooperates with the inner sealing hole, and the tapered thread section cooperates with the tapered screw hole to form a tapered thread sealing surface.

[0024] Preferably, the diameter of the second connecting section is smaller than the diameter of the inner sealing section, and the outer periphery of the second connecting section is provided with the fifth sealing element. The right end face of the fifth sealing element is in sealing contact with the bottom of the inner sealing hole, and the left end face of the fifth sealing element is in sealing contact with the inner sealing section.

[0025] Preferably, the diameter of the first connecting section is smaller than the diameter of the inner sealing section, the second operating end has the glue injection channel in the axial direction, the second operating end, the first connecting section, the inner sealing section and the inner sealing hole form the glue injection cavity, and the glue injection channel communicates with the glue injection cavity.

[0026] Preferably, step S2 includes: when it is determined that a sewage discharge operation needs to be performed on the pipeline, unscrewing the plug from the sewage discharge ball valve, and then rotating the operating handle to rotate the first ball and the second ball to the open position respectively, until the sewage discharge operation is completed.

[0027] Preferably, step S3 includes: first, rotating the operating handle to rotate the first ball and the second ball to the closed position respectively; then, screwing the plug into the drain ball valve and ensuring that the guide gap is connected to the fluid channel inside the drain ball valve; controlling the flushing component to introduce inert gas into the main valve body through the flushing hole; and the detection component determining whether the content of toxic medium discharged from the main valve body through the guide gap exceeds a third predetermined threshold. If it exceeds the third predetermined threshold, it is determined that the seal between the ball and the valve seat inside the drain ball valve has failed; otherwise, it is determined that the seal between the ball and the valve seat inside the drain ball valve is normal.

[0028] Subsequently, the plug is tightened to make the plug and the fourth sealing element in a sealed contact state. The operating handle is rotated to rotate the first ball and the second ball to the open position respectively. The detection component determines whether the content of toxic medium discharged from the main valve body through the guide gap exceeds the fourth predetermined threshold. If it exceeds the fourth predetermined threshold, it is determined that the fourth sealing element has failed to seal; otherwise, it is determined that the fourth sealing element is normal to seal.

[0029] Compared with the prior art, the pipeline sewage discharge method for conveying toxic media provided by the present invention has the following beneficial technical effects:

[0030] 1. In this invention, on the one hand, by simply loosening and tightening the seal, and in conjunction with structures such as leak detection holes and flushing holes, and especially by cleverly setting a guide gap between the seal and the guide groove, it is possible to detect not only the effectiveness of the seal between the ball and the valve seat, but also the effectiveness of the seal of the fourth sealing element, thereby enabling a rapid assessment of the sealing reliability of the drain ball valve. On the other hand, by setting a flushing hole on the side valve body and connecting a flushing assembly to the end of the flushing hole, during leak detection, the flushing assembly is used to discharge all the medium inside the drain ball valve into the detection assembly. This design allows toxic media in the main valve body to be quickly and fully discharged, improving not only detection efficiency and accuracy, but also the safety of the entire leak detection process.

[0031] 2. In this invention, the sealing is configured as an outer sealing and an inner sealing. A guide gap is formed between the first cylindrical section and the guide groove on the outer sealing. The fourth sealing element is located on the outer circumferential surface of the second cylindrical section, and the end face of the first cylindrical section is in sealing contact with the fourth sealing element. A drain hole is provided inside the outer sealing, and the inner sealing is installed in the drain hole provided inside the outer sealing. A tapered thread sealing surface, a fifth sealing element, and sealant are sequentially arranged between the inner and outer sealing. The tapered thread sealing surface can effectively block the gas medium, forming a primary seal. Subsequently, the gas medium is sealed in a secondary and tertiary manner by the fifth sealing element and sealant, respectively, effectively improving the sealing effect.

[0032] In this invention, a sealing setup combining an outer and inner seal achieves a high degree of integration between sewage discharge and detection. The outer seal is primarily used for leak detection. When a leak detection process is required on the sewage ball valve, the outer seal is operated, and the effectiveness of the seal between the ball and the valve seat, or the fourth sealing element, is checked by tightening and loosening the outer seal. The inner seal is primarily used for sewage discharge. When a sewage discharge process is required, the inner seal is operated by unscrewing it from the outer seal for pipeline sewage discharge. After sewage discharge is completed, the inner seal is screwed back into the outer seal, and sealant is injected into the injection cavity through the injection channel, thereby ensuring the sealing performance of the seal. In particular, this setup significantly reduces the switching frequency of the outer seal, thereby minimizing damage to the fourth sealing element, preventing leakage at the end connection of the sewage ball valve, and improving the safety and reliability when transporting toxic media.

[0033] 3. In this invention, when it is determined that a sewage discharge operation is required for the pipeline, the plug is unscrewed from the sewage discharge ball valve to carry out the sewage discharge operation. After the sewage discharge is completed, the sealing performance between the ball and the valve seat inside the sewage discharge ball valve is first tested, and then the sealing performance of the fourth sealing element is tested. This allows for a simple and convenient determination of the sealing performance of the sewage discharge ball valve, improving the safety and reliability when transporting toxic media.

[0034] Furthermore, this invention configures the sealing mechanism to include both an external and an internal sealing layer. Therefore, when a sewage discharge operation is required, only the internal sealing layer needs to be operated to complete the operation. Conversely, when the sealing performance of the sewage ball valve needs to be tested, only the external sealing layer needs to be operated to complete the test. This improves the convenience of sewage ball valve sealing testing and sewage discharge operations. Additionally, it significantly reduces the switching frequency of the external sealing layer, thereby minimizing damage to the fourth sealing element, preventing leakage at the end connection of the sewage ball valve, and improving the safety and reliability when conveying toxic media. Attached Figure Description

[0035] Figure 1 This is a schematic diagram of the structure of the drain ball valve of the present invention;

[0036] Figure 2 This is a top view of the drain ball valve of the present invention;

[0037] Figure 3 This is a partial schematic diagram of the end connection structure;

[0038] Figure 4 This is a partial schematic diagram of the drain ball valve without the plug installed;

[0039] Figure 5 A partial schematic diagram of the drain ball valve during assembly and sealing;

[0040] Figure 6 This is a schematic diagram of the sealing structure;

[0041] Figure 7 This is a flowchart of the sewage discharge method of the present invention.

[0042] The meanings of the symbols marked in the figure are as follows:

[0043] 1. Main valve body; 2. Side valve body; 3. Block; 4. First ball; 5. Second ball; 6. First valve seat; 7. Second valve seat; 8. Third valve seat; 9. Valve stem; 10. Line valve; 11. Flat spring; 12. Annular protrusion; 13. Insertion part; 14. First mounting groove; 15. Second mounting groove; 16. Operating handle; 17. Fluid passage;

[0044] 101. Annular groove; 102. Insertion hole; 103. First sealing element; 104. Second sealing element; 105. First rubber sealing ring;

[0045] 21. Plug mounting hole; 22. Guide groove; 23. Third mounting groove; 24. Leak detection hole; 25. Third seal; 26. Fourth seal; 27. Second rubber sealing ring; 28. Fourth mounting groove; 29. ​​Fifth mounting groove;

[0046] 31. External plug; 32. Internal plug; 33. Guide gap; 34. Detection assembly; 35. Flushing hole; 36. Flushing assembly;

[0047] 311. First operating end; 312. Outer sealing body; 313. First cylindrical section; 314. Second cylindrical section; 315. Inner sealing hole; 316. Tapered screw hole;

[0048] 321. Second operating end; 322. Inner sealing section; 323. Tapered thread section; 324. Adhesive injection cavity; 325. Fifth sealing element; 326. Adhesive injection channel; 327. First connecting section; 328. Second connecting section. Detailed Implementation

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0050] Therefore, the following detailed description of embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely illustrates some embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0052] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0053] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this 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 this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0054] See appendix Figure 1 - Appendix Figure 6 As shown, the present invention provides a sewage ball valve, including a main valve body 1 and a side valve body 2. A ball and a valve seat are installed inside the main valve body 1. One end of the main valve body 1 is sealed to a pipeline valve 10 on the conveying pipeline, and the other end of the main valve body 1 is sealed to the side valve body 2. A plug 3 is installed at one end of the side valve body 2.

[0055] One end of the side valve body 2 is sequentially provided with a plug mounting hole 21, a guide groove 22, and a third mounting groove 23. The plug mounting hole 21, guide groove 22, and third mounting groove 23 are coaxially and interconnected with the fluid channel 17 on the side valve body 2. The inner circumference of the plug mounting hole 21 is provided with an internal thread, and the outer circumference of the plug 3 is provided with an external thread. The plug 3 is threadedly connected to the plug mounting hole 21. In the guide groove 22, a leak detection hole 24 and a flushing hole 35 are provided radially along the guide groove 22. The leak detection hole 24 and the flushing hole 35 are arranged opposite each other in the circumferential direction. The end of the leak detection hole 24 is connected to a detection component 34, and the end of the flushing hole 35 is connected to a flushing component 36. A fourth sealing element 26 is installed in the third mounting groove 23. When the plug 3 is assembled into the plug mounting hole 21, there is a guide gap 33 between one side of the plug 3 and the guide groove 22, and the plug 3 and the fourth sealing element 26 are in sealing contact. When the plug 3 is loosened, the flushing assembly 36 introduces inert gas into the main valve body 1. The inert gas is delivered into the main valve body 1 through the guide gap 33, and the medium inside the main valve body 1 is discharged to the detection assembly 34 through the guide gap 33. The detection assembly 34 is used to detect whether the content of the toxic medium discharged from the main valve body 1 exceeds the standard, thereby determining whether there is a sealing failure between the ball and the valve seat. When the plug 3 is tightened, the medium inside the main valve body 1 is discharged to the detection assembly 34 through the guide gap 33. The detection assembly 34 is used to detect whether the content of the toxic medium discharged from the main valve body 1 exceeds the standard, thereby determining whether there is a sealing failure of the fourth seal 26.

[0056] Specifically, the leak detection process of the sewage ball valve of the present invention is as follows: When it is necessary to detect whether the seal between the ball and the valve seat is effective, the ball is closed, the plug 3 is loosened, so that the leak detection hole 24 and the flushing hole 35 opened on the side valve body 2 are connected to the fluid channel 17. The flushing assembly 36 is used to introduce inert gas into the main valve body 1 through the flushing hole 35. The inert gas is transported into the main valve body 1 through the guide gap 33, which can quickly discharge the medium in the main valve body 1 to the detection assembly 34 through the guide gap 33. At this time, the detection assembly 34 detects whether the content of toxic medium in the main valve body 1 exceeds the threshold. If the content exceeds the threshold, it indicates that the seal between the ball and the valve seat has failed; otherwise, it indicates that the seal between the ball and the valve seat is effective.

[0057] When it is necessary to test the sealing effectiveness of the fourth seal 26, the ball is opened and the plug 3 is tightened to make the plug 3 and the fourth seal 26 in a sealed contact state. At this time, the detection component 34 detects whether the content of toxic medium discharged from the main valve body 1 through the guide gap 33 exceeds the standard, thereby determining whether the fourth seal 26 has a sealing failure. If the content exceeds the threshold, it means that the toxic medium discharged from the main valve body 1 has leaked into the guide gap 33 through the fourth seal 26 and has been detected by the detection component 34, that is, the sealing of the fourth seal 26 has failed. Conversely, it means that the sealing of the fourth seal 26 is effective.

[0058] In this invention, on the one hand, by simply loosening and tightening the seal, and in conjunction with structures such as leak detection holes and flushing holes, and especially by cleverly setting a guide gap between the seal and the guide groove, it is possible to detect not only the effectiveness of the seal between the ball and the valve seat, but also the effectiveness of the seal of the fourth sealing element, thereby enabling a rapid assessment of the sealing reliability of the drain ball valve. On the other hand, by setting a flushing hole on the side valve body and connecting a flushing assembly to the end of the flushing hole, during leak detection, the flushing assembly is used to discharge all the medium inside the drain ball valve into the detection assembly. This design allows toxic media in the main valve body to be quickly and fully discharged, improving not only detection efficiency and accuracy, but also the safety of the entire leak detection process.

[0059] When the transport pipeline needs to be drained, the plug 3 needs to be unscrewed, and after the draining is completed, the plug 3 needs to be screwed back in. However, frequent operation of the plug 3 can damage the sealing performance of the fourth seal 26, easily leading to leakage at the end connection of the drain ball valve. To solve this technical problem, the following preferred embodiment is further provided:

[0060] The plug 3 includes an outer plug 31 and an inner plug 32. The outer plug 31 is threadedly connected to the plug mounting hole 21. The outer plug 31 has a through drain hole, which includes an inner plug sealing hole 315 and a tapered screw hole 316 connected in sequence. The inner plug 32 is installed in the drain hole provided in the outer plug 31.

[0061] The outer plug 31 includes a first operating end 311 and an outer plug body 312 connected to the first operating end 311. The outer peripheral surface of the outer plug body 312 is provided with external threads. The end of the outer plug body 312 is provided with a first cylindrical section 313 and a second cylindrical section 314 in sequence. The diameter of the first cylindrical section 313 is smaller than the diameter of the outer plug body 312, so as to form a guide gap 33 between the first cylindrical section 313 and the guide groove 22. The diameter of the second cylindrical section 314 is smaller than the diameter of the first cylindrical section 313. The second cylindrical section 314 is inserted into the fluid channel 17 opened on the side valve body 2. The fourth seal 26 is provided on the outer peripheral surface of the second cylindrical section 314, and the right end face of the fourth seal 26 is in sealing contact with the bottom of the third mounting groove 23, and the left end face of the fourth seal 26 is in sealing contact with the end face of the first cylindrical section 313.

[0062] The inner plug 32 includes a second operating end 321, a first connecting section 327, an inner plug sealing section 322, a second connecting section 328, and a tapered thread section 323 connected in sequence. When the inner plug 32 is installed in the outer plug 31, the inner plug sealing section 322 cooperates with the inner plug sealing hole 315, and the tapered thread section 323 cooperates with the tapered thread hole 316 to form a tapered thread sealing surface. The tapered thread sealing surface can more effectively seal the gas, improve the sealing performance of the drain ball valve, and effectively avoid leakage at the end connection of the drain ball valve. The diameters of the first connecting section 327 and the second connecting section 328 are smaller than the diameter of the inner sealing section 322. A fifth sealing element 325 is provided on the outer periphery of the second connecting section 328. The right end face of the fifth sealing element 325 is in sealing contact with the bottom of the inner sealing hole 315, and the left end face of the fifth sealing element 325 is in sealing contact with the inner sealing section 322. An adhesive injection channel 326 is provided in the axial direction of the second operating end 321. The second operating end 321, the first connecting section 327, the inner sealing section 322, and the inner sealing hole 315 form an adhesive injection cavity 324. The adhesive injection channel 326 communicates with the adhesive injection cavity 324, and sealant is injected into the adhesive injection cavity 324. After the inner seal 32 is installed into the outer seal 31, sealant is injected into the injection channel 326 using the injection assembly (not shown). The sealant enters the injection cavity 324 through the injection channel 326 to seal the gap between the outer seal 31 and the inner seal 32. Each time the inner seal 32 is installed into the outer seal 31, the sealing effect is greatly improved by injecting sealant into the injection cavity 324.

[0063] In this invention, the sealing is configured as an outer seal and an inner seal. A guide gap is formed between the first cylindrical section and the guide groove on the outer seal. The fourth sealing element is located on the outer circumferential surface of the second cylindrical section, and the end face of the first cylindrical section is in sealing contact with the fourth sealing element. A drain hole is provided inside the outer seal, and the inner seal is installed in the drain hole provided inside the outer seal. A tapered thread sealing surface, a fifth sealing element, and sealant are sequentially arranged between the inner and outer seals. The tapered thread sealing surface can effectively block the gas medium, forming a primary seal. Subsequently, the gas medium is sealed in a secondary and tertiary manner by the fifth sealing element and sealant, respectively, effectively improving the sealing effect.

[0064] In this invention, a sealing setup combining an outer and inner seal achieves a high degree of integration between sewage discharge and detection. The outer seal is primarily used for leak detection. When a leak detection process is required on the sewage ball valve, the outer seal is operated, and the effectiveness of the seal between the ball and the valve seat, or the fourth sealing element, is checked by tightening and loosening the outer seal. The inner seal is primarily used for sewage discharge. When a sewage discharge process is required, the inner seal is operated by unscrewing it from the outer seal for pipeline sewage discharge. After sewage discharge is completed, the inner seal is screwed back into the outer seal, and sealant is injected into the injection cavity through the injection channel, thereby ensuring the sealing performance of the seal. In particular, this setup significantly reduces the switching frequency of the outer seal, thereby minimizing damage to the fourth sealing element, preventing leakage at the end connection of the sewage ball valve, and improving the safety and reliability when transporting toxic media.

[0065] In addition, to achieve an effective seal between the main valve body 1 and the pipeline valve 10, the following preferred embodiments are provided:

[0066] Preferably, the end face connecting the main valve body 1 and the pipeline valve 10 is provided with an annular protrusion 12 and a plug-in portion 13 in sequence, and a first mounting groove 14 and a second mounting groove 15 are provided at intervals along the axial direction of the plug-in portion 13; the pipeline valve 10 is provided with an annular groove 101 and a plug-in hole 102, and the plug-in hole 102 is coaxially arranged with the fluid channel 17 opened on the pipeline valve 10; the annular protrusion 12 cooperates with the annular groove 101, and a first sealing element 103 is installed between the annular protrusion 12 and the annular groove 101, and the left and right sides of the first sealing element 103 respectively seal and contact the annular protrusion 12 and the annular groove 101; the plug-in portion 13 cooperates with the plug-in hole 102, and a second sealing element 104 and a first rubber sealing ring 105 are respectively installed in the first mounting groove 14 and the second mounting groove 15, and the second sealing element 104 and the first rubber sealing ring 105 respectively seal and contact the plug-in hole 102.

[0067] Preferably, a fourth mounting groove 28 is provided on the outer peripheral surface of the side valve body 2 inserted into the main valve body 1. A second rubber sealing ring 27 is installed in the fourth mounting groove 28 and is in sealing contact with the main valve body 1. A fifth mounting groove 29 is provided on the end face of the main valve body 1 connected to the side valve body 2. A third sealing element 25 is installed in the fifth mounting groove 29 and is in sealing contact with the side valve body 2 and the main valve body on the left and right sides, respectively.

[0068] Preferably, a first ball 4, a second ball 5, a first valve seat 6, a second valve seat 7, and a third valve seat 8 are respectively installed inside the main valve body 1. The two sides of the first ball 4 are in sealing contact with the first valve seat 6 and the second valve seat 7, respectively. The two sides of the second ball 5 are in sealing contact with the second valve seat 7 and the third valve seat 8, respectively. The right end face of the side valve body 2 abuts against the first valve seat 6. A flat spring 11 is installed between the third valve seat 8 and the main valve body 1. The flat spring 11 provides a sealing preload for the first ball 4 and the second ball 5 to ensure a low-pressure sealing effect. A valve stem 9 is drivenly connected to both the first ball 4 and the second ball 5. An operating handle 16 is drivenly connected to the valve stem 9. The valve stems 9 on the first ball 4 and the second ball 5 are offset by 90° in the circumferential direction of the main valve body 1. The pipeline valve 10, main valve body 1, first ball 4, second ball 5, first valve seat 6, second valve seat 7, third valve seat 8 and side valve body 2 are all provided with fluid passages 17. When the ball valve is open, the fluid passages 17 in the ball valve are in a connected state.

[0069] The present invention provides a triple sealing structure by sequentially installing a second sealing element, a first rubber sealing ring, and a third sealing element along the path of media leakage at the connection between the sewage ball valve and the pipeline valve. This structure effectively prevents leakage at the connection between the sewage ball valve and the pipeline valve.

[0070] Meanwhile, a second rubber sealing ring and a third sealing element are sequentially installed at the connection between the main valve body and the side valve body along the path of medium leakage, forming a double sealing structure that can effectively prevent leakage at the end connection of the drain ball valve.

[0071] In summary, the sewage ball valve of the present invention has two sealing processes set sequentially along the sewage discharge path, which can ensure the internal and external sealing effects of the sewage ball valve and improve the safety and reliability when conveying toxic media.

[0072] See appendix Figure 7 As shown, the present invention also provides a method for draining a pipeline containing a toxic medium, wherein a drain ball valve is installed on the pipeline valve 10, and the pipeline draining method includes the following steps:

[0073] S1: Check if the pipeline needs to be drained;

[0074] Specifically, the system detects whether the residual dirt inside the pipe reaches a predetermined discharge threshold. If the residual dirt reaches the predetermined discharge threshold, the pipe needs to be drained; otherwise, no drainage is required. For example, a sensor can be used to detect whether the depth of the residual dirt inside the pipe exceeds a predetermined depth threshold. If it does, it is determined that the pipe needs to be drained. Of course, this is not limited to the above implementation method. Since there is a correlation between the amount of residual dirt and the pipe drainage interval, it is also possible to determine whether a predetermined drainage time has been reached. If the predetermined drainage time has been reached, the pipe is drained.

[0075] S2: If so, open the drain ball valve and drain port;

[0076] Specifically, when it is determined that a sewage discharge operation is required, the plug 3 is unscrewed from the sewage discharge ball valve, and then the operating handle 16 is turned to rotate the first ball 4 and the second ball 5 to the open position respectively until the sewage discharge operation is completed.

[0077] S3: After the sewage discharge is completed, test the sealing performance of the sewage ball valve;

[0078] Specifically, first, rotate the operating handle 16 to rotate the first ball 4 and the second ball 5 to the closed position respectively. Then, screw the plug 3 into the drain ball valve and ensure that the guide gap 33 is connected to the fluid channel 17 inside the drain ball valve. Control the flushing component 36 to introduce inert gas into the main valve body 1 through the flushing hole 35. The inert gas is delivered to the main valve body 1 through the guide gap 33 and quickly discharges the medium inside the main valve body 1 through the leak detection hole 24 to the detection component 34. The detection component 34 determines whether the content of the toxic medium discharged from the main valve body 1 through the guide gap 33 exceeds the first predetermined threshold. If it exceeds the first predetermined threshold, it is determined that the seal between the ball and the valve seat inside the drain ball valve has failed. Otherwise, it is determined that the seal between the ball and the valve seat inside the drain ball valve is normal.

[0079] Subsequently, tighten the plug 3 to make the plug 3 and the fourth seal 26 in a sealed contact state. Turn the operating handle 16 to turn the first ball 4 and the second ball 5 to the open position respectively. The detection component 34 determines whether the content of the toxic medium discharged from the main valve body 1 through the guide gap 33 exceeds the second predetermined threshold. If it exceeds the second predetermined threshold, it is determined that the seal of the fourth seal 26 has failed; otherwise, it is determined that the seal of the fourth seal 26 is normal.

[0080] S4: Close the drain ball valve after the test is completed;

[0081] Specifically, after completing the sealing performance tests of the ball and seat inside the drain ball valve and the fourth sealing element 26, the operating handle 16 is turned to rotate the first ball 4 and the second ball 5 to the closed position. After the predetermined drain threshold is reached, the next drain operation is performed on the pipeline.

[0082] In the above implementation, when it is determined that a sewage discharge operation is required for the pipeline, the plug is unscrewed from the sewage discharge ball valve to carry out the sewage discharge operation. After the sewage discharge is completed, the sealing performance between the ball and the valve seat inside the sewage discharge ball valve is first tested, and then the sealing performance of the fourth sealing element is tested. This method can easily and conveniently determine the sealing performance of the sewage discharge ball valve, thereby improving the safety and reliability when transporting toxic media.

[0083] Regarding the present invention, where the plug 3 is configured to include an outer plug 31 and an inner plug 32, the inner plug 32 can be operated as needed to perform a sewage discharge operation on the pipeline, and the outer plug 31 can be operated to test the sealing performance of the sewage discharge ball valve. In the following preferred embodiment, the sewage discharge method includes the following steps:

[0084] When a pipe drainage operation is required, step S2 includes:

[0085] S21: When performing a sewage discharge operation on the pipeline, unscrew the inner plug 32 from the outer plug 31, and then turn the operating handle 16 to turn the first ball 4 and the second ball 5 to the open position respectively, so that the sewage discharge hole in the outer plug 31 is connected to the fluid channel 17 in the sewage discharge ball valve until the sewage discharge operation is completed.

[0086] S22: After the sewage discharge operation is completed, turn the operating handle 16 to turn the first ball 4 and the second ball 5 to the closed position respectively. After the predetermined sewage discharge threshold is reached, the next sewage discharge operation will be carried out on the pipeline.

[0087] S23: Screw the inner plug 32 into the outer plug 31 so that the inner plug sealing section 322 and the fifth sealing element 325 are in a sealed contact state. Control the glue injection assembly to inject sealant into the glue injection channel 326 so that the sealant enters the glue injection cavity 324 through the glue injection channel 326 to seal the gap between the outer plug 31 and the inner plug 32.

[0088] When testing the sealing performance of a drain ball valve, the following steps are included:

[0089] S31: First, ensure that the first ball 4 and the second ball 5 are in the closed position. Loosen the outer plug 31 until the guide gap 33 is connected to the fluid channel 17 inside the drain ball valve. Control the flushing assembly 36 to introduce inert gas into the main valve body 1 through the flushing hole 35. The inert gas is delivered to the main valve body 1 through the guide gap 33 and quickly discharges the medium inside the main valve body 1 through the leak detection hole 24 to the detection assembly 34. The detection assembly 34 determines whether the content of the toxic medium discharged from the main valve body 1 through the guide gap 33 exceeds the third predetermined threshold. If it exceeds the third predetermined threshold, it is determined that the seal between the ball and the valve seat inside the drain ball valve has failed. Otherwise, it is determined that the seal between the ball and the valve seat inside the drain ball valve is normal.

[0090] S32: Then, tighten the outer plug 31 so that the outer plug 31 and the fourth seal 26 are in sealed contact. Turn the operating handle 16 to turn the first ball 4 and the second ball 5 to the open position respectively. The detection component 34 determines whether the content of the toxic medium discharged from the main valve body 1 through the guide gap 33 exceeds the fourth predetermined threshold. If it exceeds the fourth predetermined threshold, it is determined that the seal of the fourth seal 26 has failed. Otherwise, it is determined that the seal of the fourth seal 26 is normal.

[0091] In the above embodiment, the sealing is configured to include both an external sealing and an internal sealing. Therefore, when a sewage discharge operation is required, only the internal sealing needs to be operated to complete the operation. Conversely, when the sealing performance of the sewage ball valve needs to be tested, only the external sealing needs to be operated. This improves the convenience of sewage ball valve sealing testing and sewage discharge operations. Furthermore, it significantly reduces the switching frequency of the external sealing, thereby minimizing damage to the fourth sealing element, preventing leakage at the end connection of the sewage ball valve, and improving the safety and reliability when conveying toxic media.

[0092] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described herein. Although the present invention has been described in detail with reference to the above embodiments, the present invention is not limited to the specific embodiments described above. Therefore, any modifications or equivalent substitutions to the present invention, as well as all technical solutions and improvements that do not depart from the spirit and scope of the invention, are covered within the scope of the claims of the present invention.

Claims

1. A method for draining sewage from a pipeline containing a toxic medium, characterized in that: A drain ball valve is installed on the pipeline valve of the pipeline. The drain ball valve includes a main valve body and a side valve body. A first ball, a second ball, and a valve seat are installed in the main valve body. A valve stem is driven to both the first ball and the second ball. An operating handle is driven to the valve stem. One end of the main valve body is sealed to the pipeline valve, and the other end is sealed to the side valve body. A plug is installed at one end of the side valve body. One end of the side valve body is provided with a plug mounting hole, a guide groove and a third mounting groove in sequence. The inner circumference of the plug mounting hole is provided with an internal thread, and the outer circumference of the plug is provided with an external thread. The plug is threadedly connected to the plug mounting hole. Within the guide groove, a leak detection hole and a flushing hole are respectively provided radially along the guide groove. The end of the leak detection hole is connected to a detection component. A fourth sealing element is installed in the third mounting groove. The end of the flushing hole is connected to a flushing component. When the plug is assembled into the plug mounting hole, there is a guide gap between one side of the plug and the guide groove. The plugging includes an outer plug and an inner plug. The outer plug is threadedly connected to the plug mounting hole. The outer plug has a through drain hole. The inner plug is installed in the drain hole inside the outer plug. An injection cavity is formed between the outer seal and the inner seal, and an injection channel is provided in the axial direction of the inner seal, which communicates with the injection cavity; a fifth sealing element is also provided between the outer seal and the inner seal. The pipeline sewage discharge method includes the following steps: S1: Check if the pipeline needs to be drained; S2: If so, open the drain ball valve and drain port; S3: After the sewage discharge is completed, test the sealing performance of the sewage ball valve; S4: Close the drain ball valve after the test is completed; When testing the sealing performance of a drain ball valve, the following steps are included: S31: First, loosen the outer plug until the guide gap is connected to the fluid channel inside the drain ball valve. Control the flushing component to introduce inert gas into the main valve body through the flushing hole. The detection component determines whether the content of toxic medium discharged from the main valve body through the guide gap exceeds a first predetermined threshold. If it exceeds the first predetermined threshold, it is determined that the seal between the ball and the valve seat inside the drain ball valve has failed. Otherwise, it is determined that the seal between the ball and the valve seat inside the drain ball valve is normal. S32: Subsequently, tighten the outer plug so that the outer plug and the fourth sealing element are in a sealed contact state. Rotate the operating handle to rotate the first ball and the second ball to the open position respectively. The detection component determines whether the content of toxic medium discharged from the main valve body through the guide gap exceeds the second predetermined threshold. If it exceeds the second predetermined threshold, it is determined that the sealing of the fourth sealing element has failed; otherwise, it is determined that the sealing of the fourth sealing element is normal.

2. The pipeline sewage discharge method as described in claim 1, characterized in that, Step S1 includes: detecting whether the residual dirt in the pipe reaches a predetermined sewage discharge threshold. If the residual dirt in the pipe reaches the predetermined sewage discharge threshold, the pipe needs to be drained; otherwise, no sewage discharge is required.

3. The pipeline sewage discharge method as described in claim 2, characterized in that, When a pipe drainage operation is required, step S2 includes: S21: Unscrew the inner plug from the outer plug, rotate the operating handle, and rotate the first ball and the second ball to the open position respectively, so that the drain hole in the outer plug is connected to the fluid channel in the drain ball valve until the drain operation is completed; S22: After the sewage discharge operation is completed, rotate the operating handle to rotate the first ball and the second ball to the closed position respectively; S23: Screw the inner plug into the outer plug so that the inner plug and the fifth sealing element are in a sealed contact state. Control the glue injection assembly to inject sealant into the glue injection channel so that the sealant enters the glue injection cavity through the glue injection channel to seal the gap between the outer plug and the inner plug.

4. The pipeline sewage discharge method as described in claim 3, characterized in that: The drain hole includes an inner sealing hole and a tapered screw hole connected in sequence; the inner sealing hole includes a second operating end, a first connecting section, an inner sealing section, a second connecting section and a tapered thread section connected in sequence. When the inner sealing hole is installed in the outer sealing hole, the inner sealing section cooperates with the inner sealing hole, and the tapered thread section cooperates with the tapered screw hole to form a tapered thread sealing surface.

5. The pipeline sewage discharge method as described in claim 4, characterized in that: The diameter of the second connecting section is smaller than the diameter of the inner sealing section. The outer periphery of the second connecting section is provided with the fifth sealing element. The right end face of the fifth sealing element is in sealing contact with the bottom of the inner sealing hole, and the left end face of the fifth sealing element is in sealing contact with the inner sealing section.

6. The pipeline sewage discharge method as described in claim 5, characterized in that: The diameter of the first connecting section is smaller than the diameter of the inner sealing section. The second operating end has an axial channel for injecting glue. The second operating end, the first connecting section, the inner sealing section, and the inner sealing hole form the glue injection cavity. The glue injection channel communicates with the glue injection cavity.

Images