Sewage discharge ball valve

Abstract

The invention belongs to the field of hydraulic valves, and particularly relates to a blow-down ball valve which comprises a main valve body and a side valve body, a ball body and a valve seat are installed in the main valve body, one end of the main valve body is connected with a pipeline valve on a conveying pipeline in a sealed mode, the other end of the main valve body is connected with the side valve body in a sealed mode, and a plug is installed at one end of the side valve body. The plug comprises an outer plug body and an inner plug body, the outer plug body is in threaded connection with the side valve body, a through sewage discharging hole is formed in the outer plug body, and the inner plug body is installed in the sewage discharging hole formed in the outer plug body. The blow-down ball valve can ensure the internal sealing effect and the external sealing effect, and improves the safety and reliability when toxic media are conveyed.

Description

Technical Field

[0001] This invention belongs to the field of hydraulic valves, and specifically relates to a drain ball valve. Background Technology

[0002] Hydrogen sulfide (H2S) is a colorless, highly toxic, flammable, and explosive gas with a strong rotten egg odor (at low concentrations). However, at high concentrations, it can rapidly paralyze the olfactory nerve, making it undetectable. Leaks can easily cause injury or death. 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 conveying toxic media containing hydrogen sulfide or similar substances. Summary of the Invention

[0003] To address the problems existing in the prior art, the purpose of this invention is to provide a drain ball valve that can guarantee both internal and external sealing effects, thereby improving the safety and reliability when conveying toxic media.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solution: A sewage ball valve includes a main valve body and a side valve body. A ball and a valve seat are installed in the main valve body. One end of the main valve body is sealed to a pipeline valve on a conveying pipeline, and the other end is sealed to the side valve body. A plug is installed at one end of the side valve body. The side valve body has a plug mounting hole, a guide groove and a third mounting groove sequentially opened at one end. The plug mounting hole, the guide groove and the third mounting groove are coaxial and interconnected with the fluid channel opened on the side valve body. The inner circumference of the plug mounting hole is provided with an internal thread, and the outer circumference of the seal is provided with an external thread, and the seal is threadedly connected to the plug mounting hole; A leak detection hole is provided radially within 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. When the plug is assembled into the plug mounting hole, a guide gap exists between one side of the plug and the guide groove, and the plug and the fourth sealing element are in sealing contact.

[0005] Preferably, a flushing hole is further provided in the guide groove along the radial direction of the guide groove. The flushing hole and the leak detection hole are arranged opposite to each other in the circumferential direction, and a flushing assembly is connected to the end of the flushing hole.

[0006] 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.

[0007] Preferably, the external plug includes a first operating end and an external plug body connected to the first operating end. The outer peripheral surface of the external plug body is provided with an external thread, and the end of the external plug body is provided with a first cylindrical section. The diameter of the first cylindrical section is smaller than the diameter of the external plug body, so as to form the guide gap between the first cylindrical section and the guide groove.

[0008] Preferably, a second cylindrical section is provided at one end of the first cylindrical section, the diameter of the second cylindrical section is smaller than the diameter of the first cylindrical section, the second cylindrical section is inserted into the fluid channel opened on the side valve body, the fourth sealing member is provided on the outer peripheral surface of the second cylindrical section, and the right end face of the fourth sealing member is in sealing contact with the bottom of the third mounting groove, and the left end face of the fourth sealing member is in sealing contact with the end face of the first cylindrical section.

[0009] 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.

[0010] Preferably, the diameter of the second connecting section is smaller than the diameter of the inner sealing section, and a fifth sealing element is provided on the outer periphery of the second connecting section. 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.

[0011] Preferably, the diameter of the first connecting section is smaller than the diameter of the inner sealing section, and the second operating end has an axial injection channel. The second operating end, the first connecting section, the inner sealing section, and the inner sealing hole form an injection cavity. The injection channel communicates with the injection cavity, and sealant is injected into the injection cavity.

[0012] Preferably, the end face of the main valve body connected to the pipeline valve is provided with an annular protrusion and a plug-in portion in sequence, and a first mounting groove and a second mounting groove are provided at intervals along the axial direction of the plug-in portion. The pipeline valve is provided with an annular groove and a plug-in hole, and the plug-in hole is coaxially arranged with the fluid channel opened on the pipeline valve. The annular protrusion mates with the annular groove, and a first sealing element is installed between the annular protrusion and the annular groove. The left and right sides of the first sealing element are in sealing contact with the annular protrusion and the annular groove, respectively. The insertion part mates with the insertion hole, and a second sealing element and a first rubber sealing ring are installed in the first mounting groove and the second mounting groove, respectively. The second sealing element and the first rubber sealing ring are in sealing contact with the insertion hole, respectively.

[0013] Preferably, a fourth mounting groove is formed on the outer peripheral surface of the side valve body that is inserted into the main valve body, and a second rubber sealing ring is installed in the fourth mounting groove. The second rubber sealing ring is in sealing contact with the main valve body. A fifth mounting groove is formed on the end face of the main valve body that connects to the side valve body, and a third sealing element is installed in the fifth mounting groove. The left and right sides of the third sealing element are in sealing contact with the side valve body and the main valve body, respectively.

[0014] Compared with the prior art, the drain ball valve provided by the present invention has the following beneficial technical effects: 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.

[0015] 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.

[0016] 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.

[0017] 3. The present invention provides a second sealing element, a first rubber sealing ring, and a first sealing element in sequence along the path of medium leakage at the connection between the sewage ball valve and the pipeline valve, forming a triple sealing structure, which can effectively prevent leakage at the connection between the sewage ball valve and the pipeline valve.

[0018] 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.

[0019] 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. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the drain ball valve of the present invention; Figure 2 This is a top view of the drain ball valve of the present invention; Figure 3 This is a partial schematic diagram of the end connection structure; Figure 4 This is a partial schematic diagram of the drain ball valve without the plug installed; Figure 5 A partial schematic diagram of the drain ball valve during assembly and sealing; Figure 6 This is a schematic diagram of the sealing structure.

[0021] The meanings of the symbols marked in the figure are as follows: 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; 101. Annular groove; 102. Insertion hole; 103. First sealing element; 104. Second sealing element; 105. First rubber sealing ring; 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; 31. External plug; 32. Internal plug; 33. Guide gap; 34. Detection assembly; 35. Flushing hole; 36. Flushing assembly; 311. First operating end; 312. Outer sealing body; 313. First cylindrical section; 314. Second cylindrical section; 315. Inner sealing hole; 316. Tapered screw hole; 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

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] 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.

[0031] 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.

[0032] 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: 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In addition, to achieve an effective seal between the main valve body 1 and the pipeline valve 10, the following preferred embodiments are provided: 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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 drain ball valve, characterized in that: It includes a main valve body and a side valve body. The main valve body is equipped with a ball and a valve seat. One end of the main valve body is sealed to a pipeline valve on the delivery pipeline, and the other end is sealed to the side valve body. One end of the side valve body is equipped with a plug. The side valve body has a plug mounting hole, a guide groove and a third mounting groove sequentially opened at one end. The plug mounting hole, the guide groove and the third mounting groove are coaxial and interconnected with the fluid channel opened on the side valve body. The inner circumference of the plug mounting hole is provided with an internal thread, and the outer circumference of the seal is provided with an external thread, and the seal is threadedly connected to the plug mounting hole; A leak detection hole is provided radially within 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. When the plug is assembled into the plug mounting hole, a guide gap exists between one side of the plug and the guide groove, and the plug and the fourth sealing element are in sealing contact.

2. The drain ball valve as described in claim 1, characterized in that: A flushing hole is provided in the radial direction of the guide groove. The flushing hole and the leak detection hole are arranged opposite to each other in the circumferential direction. A flushing assembly is connected to the end of the flushing hole.

3. The drain ball valve as described in claim 2, characterized in that: 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.

4. The drain ball valve as described in claim 3, characterized in that: The external plug includes a first operating end and an external plug body connected to the first operating end. The outer peripheral surface of the external plug body is provided with an external thread, and the end of the external plug body is provided with a first cylindrical section. The diameter of the first cylindrical section is smaller than the diameter of the external plug body, so as to form the guide gap between the first cylindrical section and the guide groove.

5. The drain ball valve as described in claim 4, characterized in that: A second cylindrical section is provided at one end of the first cylindrical section. The diameter of the second cylindrical section is smaller than that of the first cylindrical section. The second cylindrical section is inserted into the fluid channel opened on the side valve body. The fourth sealing member is provided on the outer circumferential surface of the second cylindrical section, and the right end face of the fourth sealing member is in sealing contact with the bottom of the third mounting groove, and the left end face of the fourth sealing member is in sealing contact with the end face of the first cylindrical section.

6. The drain ball valve as described in claim 5, 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.

7. The drain ball valve as described in claim 6, characterized in that: The diameter of the second connecting section is smaller than the diameter of the inner sealing section. A fifth sealing element is provided on the outer periphery of the second connecting section. 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.

8. The drain ball valve as described in claim 7, characterized in that: The diameter of the first connecting section is smaller than the diameter of the inner sealing section. An injection channel is provided in the axial direction of the second operating end. The second operating end, the first connecting section, the inner sealing section and the inner sealing hole form an injection cavity. The injection channel communicates with the injection cavity. Sealant is injected into the injection cavity.

9. The drain ball valve as described in claim 8, characterized in that: The end face of the main valve body connected to the pipeline valve is provided with an annular protrusion and a plug-in portion in sequence. A first mounting groove and a second mounting groove are provided at intervals along the axial direction of the plug-in portion. The pipeline valve is provided with an annular groove and a plug-in hole, and the plug-in hole is coaxially arranged with the fluid channel opened on the pipeline valve. The annular protrusion mates with the annular groove, and a first sealing element is installed between the annular protrusion and the annular groove. The left and right sides of the first sealing element are in sealing contact with the annular protrusion and the annular groove, respectively. The insertion part mates with the insertion hole, and a second sealing element and a first rubber sealing ring are installed in the first mounting groove and the second mounting groove, respectively. The second sealing element and the first rubber sealing ring are in sealing contact with the insertion hole, respectively.

10. The drain ball valve as described in claim 9, characterized in that: A fourth mounting groove is provided on the outer circumferential surface of the side valve body that is inserted into the main valve body. A second rubber sealing ring is installed in the fourth mounting groove and is in sealing contact with the main valve body. A fifth mounting groove is provided on the end face of the main valve body that connects to the side valve body. A third sealing element is installed in the fifth mounting groove and is in sealing contact with the side valve body and the main valve body on its left and right sides, respectively.

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