CN212056083U - Double-sealing device suitable for ultra-low temperature regulating valve - Google Patents
Double-sealing device suitable for ultra-low temperature regulating valve Download PDFInfo
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- CN212056083U CN212056083U CN202020411418.2U CN202020411418U CN212056083U CN 212056083 U CN212056083 U CN 212056083U CN 202020411418 U CN202020411418 U CN 202020411418U CN 212056083 U CN212056083 U CN 212056083U
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- corrugated pipe
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Abstract
The utility model provides a double containment suitable for ultra-low temperature governing valve, it mainly includes valve body and valve gap, is equipped with the winding between this valve body and the valve gap and fills up, be equipped with first sealing device and second sealing device in the valve body, first sealing washer is the bellows seal subassembly of setting at the valve body intermediate position, and this seal subassembly comprises valve rod and the bellows that sets up around the valve rod, the one end of bellows is connected with the valve rod through the welded mode, and the other end is connected with the direction lid of setting establishing at the bellows overcoat through the welded mode, and this kind of structural design separates into two cavities with the valve body through the bellows, can be with the low-temperature medium separation at the low level of valve gap, be close to the valve body position for ultra-low temperature operating mode, valve have advantages such as higher outer hourglass leakproofness, lower low temperature heat value that leaks.
Description
Technical Field
The utility model relates to a double containment suitable for ultra-low temperature governing valve, this structure make the valve have lower low temperature leak the calorific value, leak advantage such as dissipation leak hunting sealing grade height outward, belong to valve class technical field.
Background
In recent years, the localization technology of the liquefied natural gas device is mature day by day, and the demand of the matched ultralow temperature regulating valve is increased. Since LNG is flammable and explosive after being mixed with air, the leakage characteristic of the LNG valve is relatively high in requirement. The universal valve solves the problem that the leakage of the valve rod is mainly sealed by adopting the packing, the packing is gradually abraded along with the increase of the action times of the valve due to the fact that the packing moves relatively between the valve rod and the packing when the valve is opened and closed, and in addition, the packing is also influenced by the factors of the bending of the valve rod, the surface roughness of the valve rod and the packing box, and the like, so that the packing is difficult to meet the dissipative emission requirement.
Disclosure of Invention
The utility model discloses the purpose ensures that the valve has higher valve and leaks the exorbitant ease leak hunting sealing grade outside the ultra-low temperature operating mode, reduces the heat leakage quantity of valve simultaneously.
The utility model aims at accomplishing through following technical scheme:
a double sealing device suitable for an ultra-low temperature regulating valve mainly comprises a valve body and a valve cover, a winding pad is arranged between the valve body and the valve cover, a first sealing device and a second sealing device are arranged in the valve body, it is characterized in that the first sealing device is a bellows sealing component arranged in the middle of the valve body, the sealing component consists of a valve rod and a corrugated pipe arranged around the valve rod, one end of the corrugated pipe is connected with the valve rod in a welding mode, the other end of the corrugated pipe is connected with a guide cover sleeved outside the corrugated pipe in a welding mode, the valve rod moves along the axial direction to drive the corrugated pipe to stretch or compress so as to realize the opening and closing action of the valve, the guide cover is fixed on the valve body and the valve cover through flange bolts, and an anti-rotating block for limiting is arranged on the guide cover, the anti-rotation block can prevent the valve rod from rotating to protect the corrugated pipe, and the valve rod moves along the axial direction to drive the corrugated pipe to stretch or compress so as to realize the opening and closing action of the valve.
Preferably, the method comprises the following steps: the corrugated pipe assembly is characterized in that a second sealing device is further arranged at the top of the corrugated pipe assembly, the second sealing device is a packing sealing device, the packing sealing device is composed of a packing seat with packing arranged at the top, a packing gland is arranged at the top of the packing seat, a sealing pressure plate with a dust ring is arranged on the packing gland, and the sealing pressure plate is fixed at the top of the guide cover through a nut and a stud.
The utility model belongs to an improvement to prior art makes the ultra-low temperature governing valve have lower low temperature and leaks calorific value, leaks outward advantage such as dissipative leak hunting sealing grade height of loss through above-mentioned structural design characteristics, makes the valve operation reliable and stable.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Fig. 2 is an enlarged schematic view of the structure of the first sealing device.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings:
as shown in fig. 1-2, the double sealing device for ultra-low temperature regulating valve of the present invention mainly comprises a valve body 1 and a valve cover 3, a winding pad 2 is disposed between the valve body 1 and the valve cover 3, and a first sealing device and a second sealing device are disposed in the valve body 1, and is characterized in that the first sealing device is a bellows sealing assembly disposed at the middle position of the valve body 1, the sealing assembly comprises a valve rod 10 and a bellows 15 disposed around the valve rod 10, one end of the bellows 15 is connected with the valve rod 10 by welding, the other end is connected with a guiding cover 13 disposed outside the bellows 15 by welding, the valve rod 10 axially moves to drive the bellows 15 to stretch or compress to realize the opening and closing of the valve, the guiding cover 13 is fixed on the valve body 1 and the valve cover 3 by flange bolts, and an anti-rotation block 16 for limiting is disposed on the guiding cover 13, the anti-rotation block 16 can prevent the valve rod 10 from rotating to protect the corrugated pipe 15, the valve rod 10 moves axially to drive the corrugated pipe 15 to stretch or compress to realize the opening and closing action of the valve, the top of the corrugated pipe assembly is also provided with a second sealing device which is a packing sealing device, the packing sealing device is composed of a packing seat 5 with a packing 6 arranged at the top, a packing gland 7 is arranged at the top of the packing seat 5, a sealing pressure plate 14 with a dust ring is arranged on the packing gland 7, and the sealing pressure plate 14 is fixed at the top of the guide cover 13 through a nut 8 and a stud 9.
1. The valve body and the valve cover fix the guide cover through a middle flange bolt, the guide cover is welded with one end of the corrugated pipe, and the other end of the corrugated pipe is welded with the valve rod. The welding structure of the two ends of the corrugated pipe and the valve rod and the corrugated pipe have good strength and elasticity, so that the corrugated pipe stretches or compresses when following the action of the valve rod, when the valve rod acts, the dynamic seal of the valve rod and the packing in the common form is converted into a static seal consisting of the valve rod, the corrugated pipe, a guide cover, a valve body, a valve cover and a gasket, so that the leakage performance of the whole valve can reach 1 multiplied by 10 according to GB/T26481 valve dissipation test, and helium mass spectrum leakage detection-9Pa x m3/s or more.
2. In order to reduce heat leakage caused by heat conduction, the method can adopt the measures of using a low-heat-conductivity material, reducing the heat conduction sectional area, increasing the heat conduction length and reducing the temperature gradient of the hot end and the cold end. The bellows sealing structure is used for an ultra-low temperature regulating valve, and the bellows sealing assembly separates the interior of the valve body into a cavity A and a cavity B. On one hand, the cavity A is filled with gas, the gas basically does not flow, the heat conductivity coefficient is small, and the heat leakage value caused by heat conduction and heat convection is low; on the other hand, the bellows sealing structure can keep the liquid medium at the low position of the cavity B, which is equivalent to increasing the heat conduction length L and reducing the heat conduction heat leakage caused by the valve cover. The corrugated pipe sealing structure reduces the heat leakage value of the whole valve from the two aspects.
When the corrugated pipe sealing structure is used for an ultralow-temperature regulating valve, the regulating valve has the advantages of high leakage dissipative leakage detection sealing grade, low-temperature leakage heat value and the like under the ultralow-temperature and high-pressure working conditions.
The foregoing is considered to be illustrative of the principles and broad features of this invention, and that various changes and modifications can be made therein without departing from the spirit of the invention, and all such changes and modifications are intended to be included within the scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. A double-sealing device suitable for an ultra-low temperature regulating valve mainly comprises a valve body and a valve cover, a winding pad is arranged between the valve body and the valve cover, a first sealing device and a second sealing device are arranged in the valve body, it is characterized in that the first sealing device is a bellows sealing component arranged in the middle of the valve body, the sealing component consists of a valve rod and a corrugated pipe arranged around the valve rod, one end of the corrugated pipe is connected with the valve rod in a welding mode, the other end of the corrugated pipe is connected with a guide cover sleeved outside the corrugated pipe in a welding mode, the valve rod moves along the axial direction to drive the corrugated pipe to stretch or compress so as to realize the opening and closing action of the valve, the guide cover is fixed on the valve body and the valve cover through flange bolts, and an anti-rotating block for limiting is arranged on the guide cover, the anti-rotation block can prevent the valve rod from rotating to protect the corrugated pipe, and the valve rod moves along the axial direction to drive the corrugated pipe to stretch or compress so as to realize the opening and closing action of the valve.
2. The dual sealing device for ultra-low temperature regulating valves as claimed in claim 1, wherein the bellows assembly is further provided with a second sealing device at the top, the second sealing device is a stuffing sealing device, the stuffing sealing device is composed of a stuffing seat with stuffing at the top, a stuffing cover is provided at the top of the stuffing seat, a sealing pressure plate with a dust ring is provided on the stuffing cover, and the sealing pressure plate is fixed at the top of the guiding cover by a nut and a stud.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020411418.2U CN212056083U (en) | 2020-03-27 | 2020-03-27 | Double-sealing device suitable for ultra-low temperature regulating valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020411418.2U CN212056083U (en) | 2020-03-27 | 2020-03-27 | Double-sealing device suitable for ultra-low temperature regulating valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212056083U true CN212056083U (en) | 2020-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020411418.2U Active CN212056083U (en) | 2020-03-27 | 2020-03-27 | Double-sealing device suitable for ultra-low temperature regulating valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212056083U (en) |
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2020
- 2020-03-27 CN CN202020411418.2U patent/CN212056083U/en active Active
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