Oversized ultralow-temperature cryogenic top-mounted ball valve
By designing a pressure relief device in the cryogenic ball valve, and using the high-pressure medium to drive the cover plate to move to achieve self-pressure relief, the problem of pressure rise caused by medium vaporization during the opening and closing process of the cryogenic ball valve is solved, and the reliability and safety of self-pressure relief are improved.
Patent Information
- Application Number
- CN202423105878.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-17
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-17
AI Technical Summary
The pressure rise caused by medium vaporization during the opening and closing process of existing cryogenic ball valves is uncertain, the self-relief function has low reliability, and there are safety hazards.
An ultra-large, ultra-low temperature cryogenic top-mounted ball valve was designed, which includes a pressure relief device comprising an inner cylinder, an outer cylinder, a shaft, a cover plate, and a spring. The cover plate is driven to move by a high-pressure medium to achieve self-pressure relief, thus preventing abnormal pressure rise of the medium in the valve cavity.
It achieves a stable self-pressure relief function, avoids the uncertainty of valve seat self-pressure relief, and improves safety and reliability.
Smart Images
Figure CN223524520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of top-mounted ball valve device, and specifically relates to super large super low temperature cryogenic top-mounted ball valve. BACKGROUND
[0002] The cryogenic top-mounted ball valve is widely used as a switching device on the cryogenic pipeline of a natural gas liquid plant and an LNG receiving station due to compact structure, small overall height of the valve and the on-line maintenance function, however, the cryogenic ball valve used in the cryogenic working condition will trap a part of medium during opening and closing, when the valve is in the fully open or fully closed position, the trapped medium is sealed in a closed middle cavity by the sealing rings of the upstream and downstream, when the temperature rises, the medium is vaporized and the volume is increased by about 625 times, the pressure of the medium in the limited space will sharply rise, and there is a potential risk of failure of the pressure boundary, the valve seat structure of the super low temperature top-mounted fixed ball valve used in the cryogenic working condition is mostly double valve seat structure, the valve seat is provided with a second sealing ring, a pre-tightening nut, a spring seat, a spring, a one-way flooding plug and a two-way flooding plug, in order to avoid safety accidents caused by abnormal rise of the valve cavity pressure, the designed valve seat should be able to realize the self-pressure relief function, so as to be DBB or DIB-Ⅱ structure, each valve seat of DBB can resist the medium force in the valve passage, and at the same time, the medium in the middle cavity can be self-pressure relieved when the medium in the middle cavity abnormally rises, one valve seat of DIB-Ⅱ can cut off the medium in the passage and self-pressure relieve the medium in the middle cavity at the same time, and the other valve seat can only cut off the medium in the passage but cannot self-pressure relieve the medium in the middle cavity, whether the valve structure is DBB or DIB-Ⅱ structure, the valve seat must be able to realize the self-pressure relief function.
[0003] The self-pressure relief of the valve seat is uncertain and cannot be quantified by calculation, and the self-pressure relief of the valve seat is uncertain. CONTENT OF THE UTILITY MODEL
[0004] TECHNICAL PROBLEM
[0005] In view of the above-mentioned defects in the prior art, the utility model provides a super large super low temperature cryogenic top-mounted ball valve, which can effectively solve the problem of low reliability of the self-pressure relief function of the traditional cryogenic ball valve in the prior art.
[0006] TECHNICAL SCHEME
[0007] In order to achieve the above object, the utility model realizes the following technical scheme:
[0008] The utility model provides an extra -large super -low temperature cryogenic upper -mounted ball valve, including ball valve body, is the both ends of ball valve body respectively as liquid outlet and liquid inlet, is provided with pressure relief device on the ball valve body of one side close to liquid outlet, including inner tube, flange fixed in the outer tube of inner tube and the axle rod of setting in the inner tube in pressure relief device, the other end of inner tube keeps intercommunication with the lateral wall of ball valve body, the bottom of axle rod is fixedly connected with the top block, the middle part of axle rod is fixed with the apron, the inner side wall of the top of inner tube is fixed with the baffle, is fixed with spring between baffle and apron, the top middle part of inner tube and the middle part of baffle all are set up round hole structure, the top of axle rod sets up in above -mentioned round hole.
[0009] Further, the connection between the ball valve body and the inner tube is a horn shape with a small outer side and a large inner side, and the bottom of the apron is provided with a groove structure with a size matching the connection.
[0010] Further, the outer side of the ball valve body, the outer side of the inner tube and the bottom of the outer tube are all provided with a flange plate, and the above structure is combined and connected through a plurality of connecting bolts and nut structures.
[0011] Further, the bottom of the outer tube is provided with a plurality of hole groove structures.
[0012] Further, the spring is sleeved on the outer side of the axle rod.
[0013] Further, the size of the top block matches the inner diameter size of the connection of the ball valve body.
[0014] Advantages
[0015] The technical scheme provided by the utility model has the following advantages compared with the known prior art:
[0016] The pressure relief device structure is combined and connected with the ball valve body at the liquid outlet, so when the ball valve body is fully opened and the pressure of the internal medium is too high, the pressure relief device can passively discharge outward, in use, the high-pressure medium presses the axle rod and the top block structure outward, thereby driving the apron to move outward and compress the spring, the high-pressure medium enters the inner tube and rapidly fills the entire inner tube, and then flows out from the top of the inner tube and the middle of the outer tube, until the pressure inside and outside is consistent, the spring acts on the apron and the top block structure to close the connection of the ball valve body, achieving the effect of pressure relief protection, the self-pressure relief structure of the deep cooling ball valve overcomes the shortcomings of the traditional deep cooling ball valve, has a reasonable and stable structure, and discharges the abnormally pressurized medium in the valve cavity through the one-way pressure relief valve, avoids the uncertainty when the valve seat discharges pressure through the area difference, and has high reliability. BRIEF DESCRIPTION OF DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0018] Figure 1 The structure schematic view of the present application;
[0019] Figure 2 The structure transverse section view of the present application;
[0020] Figure 3 The structure longitudinal section view of the present application;
[0021] Figure 4 The structure schematic view of the present application; Figure 3 The structure schematic view of the present application;
[0022] The numbers in the figure respectively represent: 1, ball valve body; 2, pressure relief device; 21, inner cylinder; 22, outer cylinder; 23, shaft; 231, top block; 232, cover plate; 24, spring; 25, retaining ring; 26, connecting bolt; 3, liquid outlet; 4, liquid inlet. DETAILED DESCRIPTION
[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical scheme in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.
[0024] The present application will be further described below in combination with the embodiments.
[0025] Embodiment: super large and super low temperature cryogenic top-mounted ball valve, referring to the attached Figure 1 -attached Figure 4The ball valve body 1 comprises a liquid outlet 3 and a liquid inlet 4 at two ends of the ball valve body 1 respectively, and a pressure relief device 2 is arranged on the ball valve body 1 at a side close to the liquid outlet 3, wherein the pressure relief device 2 comprises an inner cylinder 21, an outer cylinder 22 with a flange fixed outside the inner cylinder 21, and a shaft 23 arranged in the inner cylinder 21, the other end of the inner cylinder 21 is in communication with the side wall of the ball valve body 1, the bottom end of the shaft 23 is fixedly connected with a top block 231, the middle part of the shaft 23 is fixedly connected with a cover plate 232, the inner side wall of the top end of the inner cylinder 21 is fixedly connected with a retaining ring 25, the retaining ring 25 and the cover plate 232 are fixedly connected with a spring 24, and the top end of the inner cylinder 21 and the middle part of the retaining ring 25 are both provided with a circular hole structure, and the top end of the shaft 23 is arranged in the circular hole.
[0026] The connection between the ball valve body 1 and the inner cylinder 21 is a horn shape with a small outer side and a large inner side, and the bottom end of the cover plate 232 is provided with a groove structure with a size matched with the size of the connection, the outer side of the ball valve body 1, the outer side of the inner cylinder 21 and the bottom end of the outer cylinder 22 are all provided with a flange plate, the above structure is combined and connected through a plurality of connecting bolts 26 and nut structures, the bottom end of the outer cylinder 22 is provided with a plurality of hole groove structures, the spring 24 is sleeved on the outer side of the shaft 23, the size of the top block 231 is matched with the inner diameter size of the connection of the ball valve body 1, and the user can combine and connect the pressure relief device 2 with the ball valve body 1 at the liquid outlet 3, so that when the ball valve body 1 is completely opened and the pressure of the internal medium is too large, the pressure relief device 2 can be passively discharged outward, in use, the high-pressure medium presses the shaft 23 and the top block 231 structure outward, and then drives the cover plate 232 to move outward, compresses the spring 24, the high-pressure medium enters the inner cylinder 21, rapidly fills the entire inner cylinder 21, and flows out from the top end of the inner cylinder 21 and the middle part of the outer cylinder 22, until the pressure inside and outside is consistent, the spring 24 acts on the cover plate 232 and the top block 231 structure, the connection of the ball valve body 1 is closed, and the pressure relief protection effect is achieved, the self-pressure relief structure of the deep cooling ball valve overcomes the shortcomings of the traditional deep cooling ball valve, the structure is reasonable and stable, the abnormal pressure medium in the valve cavity is discharged through the setting of the one-way pressure relief valve, the uncertainty existing when the valve seat is self-relieved through the area difference is avoided, and the reliability is high.
[0027] The above embodiments are only used to illustrate the technical solutions of the present application, but not limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced equivalently; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.
Claims
1. A super ultra-low temperature deep cryogenic top entry ball valve, characterized in that, Including ball valve body (1), is the two ends of ball valve body (1) are liquid outlet (3) and liquid inlet (4) respectively, the ball valve body (1) is provided with pressure relief device (2) on the side close to the liquid outlet (3), the pressure relief device (2) includes inner cylinder (21), flange fixed outer cylinder (22) outside the inner cylinder (21) and shaft (23) arranged in the inner cylinder (21), the other end of the inner cylinder (21) is communicated with the side wall of the ball valve body (1), the bottom end of the shaft (23) is fixedly connected with the top block (231), the middle part of the shaft (23) is fixed with the cover plate (232), the top end inner wall of the inner cylinder (21) is fixedly connected with the retaining ring (25), the spring (24) is fixed between the retaining ring (25) and the cover plate (232), the top end middle part of the inner cylinder (21) and the middle part of the retaining ring (25) are provided with round hole structure, and the top end of the shaft (23) is arranged in the above-mentioned round hole.
2. The ultra-low temperature deep cryogenic top entry ball valve according to claim 1, characterized in that, The connecting portion of the ball valve body (1) and the inner cylinder (21) is a horn shape with small outer side and large inner side, and the bottom end of the cover plate (232) is provided with a groove structure with a size matching the connecting portion.
3. The ultra-low temperature deep cryogenic top entry ball valve according to claim 1, wherein, The outer side of the ball valve body (1), the outer side of the inner cylinder (21) and the bottom end of the outer cylinder (22) are provided with flange plates, and the above structure is combined and connected by a plurality of connecting bolts (26) and nut structures.
4. The ultra-low temperature deep cryogenic top entry ball valve according to claim 1, wherein, The bottom end of the outer cylinder (22) is provided with a plurality of hole groove structures.
5. The ultra-low temperature deep cryogenic top entry ball valve according to claim 4, characterized in that, The spring (24) is sleeved on the outer side of the shaft (23).
6. The ultra-low temperature deep cryogenic top entry ball valve according to claim 2, wherein, The size of the top block (231) is matched with the inner diameter size of the connecting portion of the ball valve body (1).