Top-mounted ultralow-temperature cryogenic ball valve
By introducing a passive pressure relief device into the deep cold ball valve, the problem of pressure increase in the valve cavity is solved, and the self-pressure relief function is realized, ensuring safety and stability of the pressure boundary.
Patent Information
- Application Number
- CN202422952780.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-01-10
- Estimated Expiration
- 2034-12-02
AI Technical Summary
The existing deep-cold ball valves will intercept media during opening and closing, resulting in abnormal increase in the valve cavity pressure, which poses a risk of safety accidents, and the valve seat lacks self-pressure relief function.
A top-mounted ultra-low temperature deep-cold ball valve is designed, adopting a passive pressure relief device, including positioning holes, adapter pipes, connecting flanges, passive pressure relief devices, erecting pipes, pressure relief chambers, lifting rods, closure covers, connecting rods, and connections The table, rotary rod and spring discharge excess pressure through the pressure relief hole and the pressure relief hole to achieve constant pressure in the valve cavity.
It effectively solves the problem of pressure increase in the valve cavity, ensures safety, and automatically discharges excess gas when the pressure rises through the passive pressure relief device, avoiding the risk of pressure boundary failure.
Smart Images
Figure CN222334607U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ball valve devices, in particular to a top-mounted ultra-low temperature deep-cold ball valve. Background Art
[0002] Cryogenic top-entry ball valves are widely used as switch devices on cryogenic pipelines in natural gas liquid plants and LNG receiving stations due to their compact structure, small overall valve height, and ability to realize online maintenance. However, cryogenic ball valves used in cryogenic conditions will retain a portion of the medium during the opening and closing process. When the valve is in the fully open or fully closed position, these retained media are sealed in a closed middle cavity by the upstream and downstream sealing rings. When the temperature rises, gasification occurs, and the volume increases by about 625 times. The pressure of these media will rise sharply in a limited space, and there is a potential risk of failure of the pressure boundary.
[0003] The existing ultra-low temperature top-mounted fixed ball valve seat structure used in cryogenic conditions is mostly a double valve seat structure, and the valve seat is provided with a second sealing ring, a pre-tightening nut, a spring seat, a spring, a one-way flood plug, a two-way flood plug and other structures. In order to avoid safety accidents caused by abnormal increase in valve cavity pressure, the designed valve seat should be able to achieve self-pressure relief function, so it is a DBB or DIB-Ⅱ structure. Among them, each valve seat of DBB can resist the medium force in the valve channel, and at the same time, it should be able to self-relieve pressure for the abnormally increased medium in the middle cavity. One valve seat of DIB-Ⅱ, like the valve seat of DBB, should be able to self-relieve pressure for the middle cavity medium while cutting off the channel medium. The other valve seat can only cut off the channel medium but cannot relieve pressure for the middle cavity medium. Regardless of whether the valve structure is DBB or DIB-Ⅱ structure, it must be ensured that the valve seat can achieve self-pressure relief function. Utility Model Content
[0004] Technical issues solved:
[0005] In view of the above-mentioned shortcomings of the prior art, the utility model provides a top-mounted ultra-low temperature cryogenic ball valve, which can effectively solve the problem that the valve seat in the prior art lacks a self-pressure relief function.
[0006] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:
[0007] The utility model provides a top-mounted ultra-low temperature deep-cold ball valve, including a low-temperature ball valve, a positioning hole is opened on one side of the valve cavity of the low-temperature ball valve, a transfer tube is fixed to the outer side of the positioning hole, the top end of the transfer tube is connected with a passive pressure relief device through a connecting flange, the passive pressure relief device includes a mounting pipe, a pressure relief chamber fixed to the top end of the mounting pipe and a lifting rod arranged in the pressure relief chamber, the lifting rod includes a closing cover, a connecting rod fixed on the closing cover and a connecting platform fixed to the top end of the connecting rod, a rotating rod and a spring fixed to the outside of the rotating rod are fixed on the top end of the connecting platform, a sealing cover is provided on the top end of the pressure relief chamber, the rotating rod passes through the middle part of the sealing cover and is fixedly connected to the bottom end of the rotating block, and a locking nut is provided on the top end of the rotating rod.
[0008] Furthermore, the connecting flange includes an upper flange and a lower flange, the upper flange is fixedly connected to the bottom end of the rigging pipe, the lower flange is fixedly connected to the end of the transfer tube, and the upper flange and the lower flange are fixedly connected via a connecting nut.
[0009] Furthermore, the rigging pipe is a structure with a large inner diameter at one end and a small inner diameter at the other end, and the thickness of the rigging pipe at the end with the small inner diameter is adapted to the thickness of the closing cover, and the closing cover is a hollow trumpet-shaped structure.
[0010] Furthermore, the connecting platform is a solid trumpet-shaped frustum structure, and the spring is in contact with the bottom end of the cover but is not fixed.
[0011] Furthermore, the pressure relief chamber is a hollow platform structure that is larger at the top and smaller at the bottom, and pressure relief holes are arranged in an equidistant array on the arc surface of the pressure relief chamber, and the bottom diameter of the connecting platform is matched with the inner diameter of the bottom of the pressure relief chamber.
[0012] Furthermore, the outer side wall of the rotating rod is provided with a thread structure.
[0013] Compared with the known public technology, the technical solution provided by the utility model has the following beneficial effects:
[0014] The utility model provides a passive pressure relief device, and the user can connect and fix the device with the transfer pipe through the connecting flange. After installation, when the pressure in the valve cavity of the ball valve is higher than a specific value, it can be discharged outwardly by the passive pressure relief device, so that the internal pressure is kept at a constant value and the use requirements on site are met. Therefore, in specific use, the external high pressure enters the passive pressure relief device through the transfer pipe, and the closing cover placed at the bottom end of the pressure relief hole can be lifted up, and then the spring stroke is compressed upward through the connecting rod-connecting platform, and the gas enters the pressure relief chamber and is discharged outwardly through the pressure relief hole until the use requirements are met. Since the rotating rod passes through the sealing cover, the rotating rod can be lifted up, and the locking nut can be engaged with the rotating rod to determine the position and length of the rotating rod. The rotating rod can also be pulled up, and then the stroke of the spring is compressed, which plays a role in adjusting the elastic pressure of the closing cover. When the pressure in the valve cavity is normal, the closing cover is erected on the inner wall of the erection pipe to achieve sealing. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0016] Figure 1 It is a schematic diagram of the structure of the utility model;
[0017] Figure 2 This is a structural breakdown diagram of the utility model;
[0018] Figure 3 It is a structural cross-sectional view of the passive pressure relief device of the utility model;
[0019] Figure 4 This is one of the structural disassembly diagrams of the passive pressure relief device of the utility model;
[0020] Figure 5 This is the second structural disassembly diagram of the passive pressure relief device in the utility model.
[0021] The numbers in the figure represent: 1. Cryogenic ball valve; 11. Positioning hole; 2. Transfer tube; 21. Connecting flange; 211. Lower flange; 212. Upper flange; 22. Connecting bolts; 3. Passive pressure relief device; 31. Rigging pipe; 32. Pressure relief chamber; 321. Pressure relief hole; 33. Lifting rod; 331. Closing cover; 332. Connecting rod; 333. Connecting platform; 334. Turning rod; 335. Turning block; 34. Spring; 35. Locking nut; 36. Cover. DETAILED DESCRIPTION
[0022] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] The utility model is further described below in conjunction with embodiments.
[0024] Example: Top-loading ultra-low temperature cryogenic ball valve, refer to the attached Figure 1 -Attached Figure 5 , including a cryogenic ball valve 1, a positioning hole 11 is opened on one side of the valve cavity of the cryogenic ball valve 1, a transfer tube 2 is fixed on the outer side of the positioning hole 11, the top of the transfer tube 2 is connected with the passive pressure relief device 3 through a connecting flange 21, the passive pressure relief device 3 includes a mounting pipe 31, a pressure relief chamber 32 fixed to the top of the mounting pipe 31 and a lifting rod 33 arranged in the pressure relief chamber 32, the lifting rod 33 includes a closing cover 331, a connecting rod 332 fixed on the closing cover 331 and a connecting platform 333 fixed to the top of the connecting rod 332, a rotating rod 334 and a spring 34 fixed to the outside of the rotating rod 334 are fixed on the top of the connecting platform 333, a sealing cover 36 is provided on the top of the pressure relief chamber 32, the rotating rod 334 passes through the middle of the sealing cover 36, and is fixedly connected to the bottom end of the rotating block 335, and a locking nut 35 is provided on the top of the rotating rod 334;
[0025] The connecting flange 21 includes an upper flange 212 and a lower flange 211. The upper flange 212 is fixedly connected to the bottom end of the rigging pipe 31, and the lower flange 211 is fixedly connected to the end of the transfer pipe 2. The upper flange 212 and the lower flange 211 are fixedly connected via a connecting nut.
[0026] The mounting tube 31 is a structure with a large inner diameter at one end and a small inner diameter at the other end, and the thickness of the mounting tube 31 at the end with a small inner diameter is adapted to the thickness of the closing cover 331, and the closing cover 331 is a hollow trumpet-shaped structure; through the passive pressure relief device 3, the user can connect and fix the device to the transfer tube 2 through the connecting flange 21. After installation, when the pressure in the valve cavity of the ball valve is higher than a specific value, it can be discharged outward by the passive pressure relief device 3, so that the internal pressure is kept at a constant value and meets the on-site use requirements.
[0027] The connecting platform 333 is a solid trumpet-shaped truncated cone structure, and the spring 34 is in contact with the bottom end of the sealing cover 36 but not fixed; the pressure relief chamber 32 is a hollow platform structure with a larger upper portion and a smaller lower portion, and the pressure relief holes 321 are arranged in an equidistant array on the arc surface of the pressure relief chamber 32. The bottom end diameter of the connecting platform 333 is matched with the bottom end inner diameter of the pressure relief chamber 32, so when it is used, the external high pressure enters the passive pressure relief device 3 through the transfer tube 2, and the closed cover 331 placed at the bottom end 321 of the pressure relief hole can be lifted upward, and then through the connecting rod 332-connecting platform 3 33 compresses the stroke of spring 34 upward, and the gas enters the pressure relief chamber 32 and is discharged to the outside through the pressure relief hole 321 until the use requirements are met. Since the rotating rod 334 passes through the sealing cover 36, the rotating rod 334 can be lifted up, and the locking nut 35 can be engaged with the rotating rod 334 to determine the position and length of the rotating rod 334. The rotating rod 334 can also be pulled up to compress the stroke of the spring 34, thereby adjusting the elastic pressure of the closing cover 331. When the pressure in the valve cavity is normal, the closing cover 331 is mounted on the inner wall of the mounting pipe 31 to achieve blocking.
[0028] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some of the technical features therein by equivalents. These modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.
Claims
1. Top-loading ultra-low temperature cryogenic ball valve, characterized in that: The invention comprises a cryogenic ball valve (1), wherein a positioning hole (11) is formed on one side of a valve cavity of the cryogenic ball valve (1), a transfer tube (2) is fixed to the outside of the positioning hole (11), the top end of the transfer tube (2) is connected to a passive pressure relief device (3) via a connecting flange (21), the passive pressure relief device (3) comprises a mounting tube (31), a pressure relief chamber (32) fixed to the top end of the mounting tube (31), and a lifting rod (33) arranged in the pressure relief chamber (32), the lifting rod (33) comprising a sealing cover (331) , a connecting rod (332) fixed on the closing cover (331) and a connecting platform (333) fixed on the top end of the connecting rod (332); a rotating rod (334) and a spring (34) fixed to the outside of the rotating rod (334) are fixedly provided on the top end of the connecting platform (333); a sealing cover (36) is provided on the top end of the pressure relief chamber (32); the rotating rod (334) passes through the middle of the sealing cover (36) and is fixedly connected to the bottom end of the rotating block (335); and a locking nut (35) is provided on the top end of the rotating rod (334).
2. The top-loading ultra-low temperature cryogenic ball valve according to claim 1 is characterized in that: The connecting flange (21) comprises an upper flange (212) and a lower flange (211); the upper flange (212) is fixedly connected to the bottom end of the rigging pipe (31); the lower flange (211) is fixedly connected to the end of the transfer pipe (2); and the upper flange (212) and the lower flange (211) are fixedly connected via a connecting nut.
3. The top-loading ultra-low temperature cryogenic ball valve according to claim 1 is characterized in that: The mounting tube (31) is a structure with a large inner diameter at one end and a small inner diameter at the other end, and the thickness of the mounting tube (31) at the end with the small inner diameter is adapted to the thickness of the sealing cover (331), and the sealing cover (331) is a hollow trumpet-shaped structure.
4. The top-loading ultra-low temperature cryogenic ball valve according to claim 1 is characterized in that: The connecting platform (333) is a solid trumpet-shaped frustum structure, and the spring (34) is in contact with the bottom end of the sealing cover (36) but is not fixed.
5. The top-loading ultra-low temperature cryogenic ball valve according to claim 4 is characterized in that: The pressure relief chamber (32) is a hollow platform structure that is larger at the top and smaller at the bottom, and pressure relief holes (321) are arranged in an equidistant array on the arc surface of the pressure relief chamber (32), and the bottom diameter of the connecting platform (333) is compatible with the bottom inner diameter of the pressure relief chamber (32).
6. The top-loading ultra-low temperature cryogenic ball valve according to claim 1 is characterized in that: The outer side wall of the rotating rod (334) is provided with a thread structure.