CN115654235A - Method and kit for steel pipeline insulation - Google Patents
Method and kit for steel pipeline insulation Download PDFInfo
- Publication number
- CN115654235A CN115654235A CN202211399230.0A CN202211399230A CN115654235A CN 115654235 A CN115654235 A CN 115654235A CN 202211399230 A CN202211399230 A CN 202211399230A CN 115654235 A CN115654235 A CN 115654235A
- Authority
- CN
- China
- Prior art keywords
- bolt
- insulating
- flanges
- kit
- steel pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000009413 insulation Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000002184 metal Substances 0.000 claims description 23
- -1 polytetrafluoroethylene Polymers 0.000 claims description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000012212 insulator Substances 0.000 claims 2
- 230000000694 effects Effects 0.000 abstract description 11
- 238000009434 installation Methods 0.000 description 8
- 238000007789 sealing Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000032683 aging Effects 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 239000010425 asbestos Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 229910052895 riebeckite Inorganic materials 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- 239000004809 Teflon Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005536 corrosion prevention Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Landscapes
- Gasket Seals (AREA)
Abstract
The invention provides a method and a kit for steel pipe insulation. The sleeve for steel pipeline insulation comprises two flanges and a pipeline; the insulating gasket is movably and hermetically arranged between the two flanges; the bolts are movably arranged on the two flanges; a nut threadedly mounted on the bolt; the bolt insulating pad is movably sleeved on the bolt and is positioned between the flange and the nut; the bolt insulating sleeve is fixedly sleeved on the bolt; and the potential indicating devices are arranged on the two flanges. The method and the kit for insulating the steel pipeline, provided by the invention, have the advantages of good insulating effect, capability of detecting the insulating state of the flange and reminding.
Description
Technical Field
The invention relates to the technical field of pipeline insulation, in particular to a method and a kit for steel pipeline insulation.
Background
The gas energy is an indispensable part in our daily life, and is particularly indispensable in modern cities. In the laying of gas pipelines, the pipeline insulation is of great importance, the pipelines are mostly connected by flanges, and the pipelines are connected in an insulation way by gaskets between the flanges.
However, the existing non-metal gasket for the flange generally uses asbestos rubber gasket, pure polytetrafluoroethylene gasket, non-asbestos fiber rubber gasket, and the rubber gasket has the disadvantages of low compressive strength, short service life, poor insulation effect, poor sealing effect, no elastic compensation, poor temperature resistance, no flame retardance, high water absorption rate, high manufacturing cost, poor aging resistance, high installation and positioning requirements, no rain water resistance, no application to a vertical flange, and inconvenience in detecting the insulation state of the flange.
Therefore, there is a need for a new method and kit for steel pipe insulation that solves the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a method and a kit for steel pipeline insulation, which have good insulation effect, can detect the insulation state of a flange and play a role in reminding.
In order to solve the technical problem, the method and the kit for insulating the steel pipeline provided by the invention comprise the following steps: two flanges and a pipe; the insulating gasket is movably and hermetically arranged between the two flanges; the bolts are movably arranged on the two flanges; a nut threadedly mounted on the bolt; the bolt insulating pad is movably sleeved on the bolt and is positioned between the flange and the nut; the bolt insulating sleeve is fixedly sleeved on the bolt; and the potential indicating devices are arranged on the two flanges.
Preferably, the potential indicating device comprises two conductive metal pads, one conductive metal pad is arranged between a flange and a bolt, the other conductive metal pad is arranged between the flange and a nut, the two conductive metal pads are welded with outgoing lines, and the two outgoing lines are connected with the same potential indicating lamp.
Preferably, the pipeline is provided with a protective shell, and the protective shell is matched with the flange.
Preferably, the thickness of the insulating spacer is 3mm, and the insulating spacer is made of resin.
Preferably, insulating pad includes first slot, first slot is seted up insulating pad's bottom, first slot embedded has first U type ring, it has first spring coil to inlay in the first U type ring, the second slot has been seted up at insulating pad's top, second slot embedded has second U type ring, it has the second spring coil to inlay in the second U type ring, it has a plurality of bolt locating holes to be equipped with on the insulating pad.
Preferably, the first groove and the second groove are both ring-shaped, the first U-shaped ring and the second U-shaped ring are made of RPTFE (filled polytetrafluoroethylene), and the first spring ring and the second spring ring are made of stainless steel material.
Preferably, the thickness of the bolt insulating pad is 3mm, and the thickness of the bolt insulating sleeve is 0.75mm.
A method for steel pipe insulation using a kit for said steel pipe insulation comprising the steps of:
s1, arranging an insulating gasket between two flanges, sleeving a bolt insulating sleeve on a bolt, sequentially penetrating the bolt through a conductive metal pad, the two flanges, the other conductive metal pad and the bolt insulating pad, and finally screwing a nut to fix the two flanges;
and S2, welding the outgoing line on the conductive metal pad, and finally connecting the outgoing line with the potential indicator lamp.
Compared with the related art, the method and the kit for steel pipeline insulation provided by the invention have the following beneficial effects:
according to the invention, the thickness of the insulating gasket is thickened from 2mm to 3mm, so that the insulating effect is ensured, then, a bolt insulating pad with the thickness of 3mm is added between the nut and the flange, in order to prevent two paired flanges from being conducted through a bolt, a bolt insulating sleeve is added on the outer wall of the bolt, in order to prevent the paired flanges from being conducted due to installation offset of the bolt and the flange, the bolt insulating sleeve is limited due to installation, and the wall thickness of the bolt insulating sleeve is 0.75mm, so that the insulation of the two flanges is ensured; when two flanges are insulated, the potential indicator lamp is turned off, and when the two flanges are insulated and invalid, the potential indicator lamp is turned on for reminding a manufacturer to replace an insulating gasket or to carry out further inspection.
Drawings
FIG. 1 is a schematic structural view of a preferred embodiment of a kit for steel pipe insulation according to the present invention;
FIG. 2 is a side view of the structure of FIG. 1;
FIG. 3 is a schematic cross-sectional view of the insulating gasket shown in FIG. 1;
FIG. 4 is a schematic structural view of the insulating gasket shown in FIG. 3;
fig. 5 is a bottom view of the insulating spacer shown in fig. 4.
Reference numbers in the figures: 1. a flange; 2. a pipeline; 3. an insulating spacer; 301. a first trench; 302. a first U-shaped ring; 303. a first spring ring; 304. a second trench; 305. a second U-shaped ring; 306. a second spring ring; 4. a bolt; 5. a nut; 6. a bolt insulating pad; 7. a bolt insulating sleeve; 8. a conductive metal pad; 9. an outgoing line; 10. a potential indicator light; 11. a protective shell.
Detailed Description
The invention is further described with reference to the following figures and embodiments.
The first embodiment is as follows:
referring to fig. 1-5 in combination, a kit for steel pipe insulation includes: two flanges 1 and a pipe 2; the insulating gasket 3 is movably and hermetically arranged between the two flanges 1; the bolts 4 are movably arranged on the two flanges 1; the nut 5 is installed on the bolt 4 in a threaded mode; the bolt insulating pad 6 is movably sleeved on the bolt 4, and the bolt insulating pad 6 is positioned between the flanges 1 and the nut 5, so that the two flanges 1 are prevented from being conducted through the bolt 4; the bolt insulating sleeve 7 is fixedly sleeved on the bolt 4, and the bolt 4 and the flange 1 are prevented from being conducted due to installation offset; potential indicating device, potential indicating device sets up two on the flange 1, potential indicating device is used for detecting two 1 insulating effects of flange to be convenient for remind the producer to change insulating gasket 3 or further inspection.
Potential indicating device includes two conductive metal pads 8, one conductive metal pad 8 sets up between a flange 1 and bolt 4, another conductive metal pad 8 sets up another between flange 1 and the nut 5, two the welding has lead-out wire 9, two on the conductive metal pad 8 be connected with same potential indicator lamp 10 on the lead-out wire 9.
Be equipped with protective housing 11 on pipeline 2, protective housing 11 and 1 looks adaptations of flange, protective housing 11 can avoid flange 1 to shine and drench to delay insulating gasket 3's ageing, ensure that insulating effect is effective for a long time.
The thickness of insulating gasket 3 is 3mm, increases thickness, improves insulating quality, and insulating gasket 3 is made by resin, can carry out size change according to the flange specification of difference.
Insulating gasket 3 includes first slot 301, first slot 301 sets up insulating gasket 3's bottom, the embedded first U type ring 302 that has of first slot 301, it has first spring coil 303 to inlay in the first U type ring 302, second slot 304 has been seted up at insulating gasket 3's top, the embedded second U type ring 305 that has of second slot 304, it has second spring coil 306 to inlay in the second U type ring 305, be equipped with a plurality of bolt locating holes on insulating gasket 3, the bolt locating hole plays the positioning action when the installation, and the bolt locating hole outside plays rain-proof water splash into effect.
The first groove 301 with the second groove 304 is the annular, first U type ring 302 is made by RPTFE (filled polytetrafluoroethylene) with second U type ring 305, first spring coil 303 with second spring coil 306 is made by stainless steel material, uses RPTFE (filled polytetrafluoroethylene) can be used for inferior high pressure flange sealing, insulating effect, and the spring in the device can be to flange looseness, vibrations carry out certain compensation, prevents to reveal, and the artificial deviation that arouses when the locating hole in the outside can be solved and is installed, makes the device more correctly, reliably install in the flange.
The insulating gasket 3 has good insulation property, high tensile strength, small elongation, high elastic coefficient, good rigidity, small water absorption and good flame retardance and aging resistance of the main body part. U-type RPTFE (filled polytetrafluoroethylene) has good insulation, excellent chemical stability, corrosion resistance, sealing property and good aging resistance. The U-shaped RPTFE (teflon-filled) is fitted inside with a stainless steel spring coil, the actuation effect of which can overcome the slight eccentricity of the metal mating surfaces and the wear of the sealing lips, while continuing to maintain the desired sealing performance.
The main body part has excellent mechanical properties: the vertical laminar compressive strength, the vertical laminar bending strength and the tensile strength are all more than or equal to 350Mpa, the parallel laminar impact strength is more than or equal to 50kJ/m & lt 2 & gt, and the parallel laminar shear strength is more than or equal to 14.7Mpa, so that the problem of deformation caused by installation is completely solved, and the U-shaped ring and the spring ring are well protected by the main body part from deformation and displacement due to pressing. This patent electrical property is excellent: the vertical layer direction electrical strength is more than or equal to 8MV/m, the withstand voltage value is more than or equal to 40000V, the insulation resistance after soaking is more than or equal to 5.0x104M omega, and the insulation and corrosion prevention requirements of the flange are completely met. The material can resist temperature of more than or equal to 200 ℃, is free from problems when used outdoors at normal temperature, and has excellent flame retardant property of V-0 and water absorption of 0.03%.
The thickness of the bolt insulating pad 6 is 3mm, the thickness of the bolt insulating sleeve 7 is 0.75mm, and the enlarged gasket can prevent the problem of insulation failure caused by rainwater splashed into the flange and can be used for most of media such as gas, liquid, solvent, hydraulic oil and lubricating oil.
The insulating gasket is set up by the structure of main part resin, U type RPTFE (filling polytetrafluoroethylene) and spring coil, and the material easily obtains the manufacturing of being convenient for, through simple machining, in addition simple manual assembly can obtain, the processing degree of difficulty is little, and the cost of labor is low.
The second embodiment:
the present embodiment provides a method for steel pipe insulation using the steel pipe insulation kit of the first embodiment, comprising the steps of:
s1, arranging an insulating gasket 3 between two flanges 1, sleeving a bolt 4 with a bolt insulating sleeve 7, sequentially penetrating the bolt 4 through a conductive metal pad 8, the two flanges 1, another conductive metal pad 8 and a bolt insulating pad 6, and finally screwing a nut 5 to fix the two flanges 1;
and S2, welding the outgoing line 9 on the conductive metal pad 8, and finally connecting the outgoing line 9 with the potential indicator lamp 10.
Compared with the related art, the method and the kit for steel pipeline insulation provided by the invention have the following beneficial effects:
according to the invention, the thickness of the insulating gasket 3 is thickened from 2mm to 3mm, so that the insulating effect is ensured, then, a bolt insulating pad 6 with the thickness of 3mm is added between the nut 5 and the flange 1, in order to avoid the conduction of the two companion flanges 1 through the bolt 4, a bolt insulating sleeve 7 is added on the outer wall of the bolt 4, in order to prevent the conduction of the companion flanges 1 due to the installation offset of the bolt 4 and the flange 1, the bolt insulating sleeve 7 is limited due to installation, the wall thickness of the bolt insulating sleeve is 0.75mm, so that the insulation of the two flanges 1 is ensured; when two flanges 1 are insulated, the potential indicator lamp 10 is turned off, and when the two flanges 1 are insulated and invalid, the potential indicator lamp 10 is turned on to remind a manufacturer to replace an insulating gasket or to further check.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A kit for steel pipe insulation, comprising:
two flanges and a pipe;
the insulating gasket is movably and hermetically arranged between the two flanges;
the bolts are movably arranged on the two flanges;
a nut threadedly mounted on the bolt;
the bolt insulating pad is movably sleeved on the bolt and is positioned between the flange and the nut;
the bolt insulating sleeve is fixedly sleeved on the bolt;
and the potential indicating devices are arranged on the two flanges.
2. The kit for steel pipe insulation according to claim 1, wherein said potential indicating device comprises two conductive metal pads, one of said conductive metal pads is disposed between one of said flanges and said bolt, the other of said conductive metal pads is disposed between the other of said flanges and said nut, said two conductive metal pads are welded with outgoing lines, and the same potential indicating lamp is connected to both of said outgoing lines.
3. A kit for steel pipe insulation as claimed in claim 2 wherein the pipe is provided with a protective shell adapted to the flange.
4. A kit for steel pipe insulation according to claim 1, wherein the insulating washer is 3mm thick and the insulating washer is made of resin.
5. The kit for steel pipe insulation of claim 4, wherein the insulating gasket comprises a first groove, the first groove is formed in the bottom of the insulating gasket, a first U-shaped ring is embedded in the first groove, a first spring ring is embedded in the first U-shaped ring, a second groove is formed in the top of the insulating gasket, a second U-shaped ring is embedded in the second groove, a second spring ring is embedded in the second U-shaped ring, and a plurality of bolt positioning holes are formed in the insulating gasket.
6. The kit for steel pipe insulation of claim 5, wherein the first and second grooves are annular, the first and second U-rings are made of RPTFE (filled polytetrafluoroethylene), and the first and second spring rings are made of stainless steel material.
7. A kit for steel pipe insulation according to claim 1, wherein the bolt insulator pad is 3mm thick and the bolt insulator sleeve is 0.75mm thick.
8. A method for steel pipe insulation, characterized in that use of a kit for steel pipe insulation according to any of claims 1-7 comprises the steps of:
s1, arranging an insulating gasket between two flanges, sleeving a bolt insulating sleeve on a bolt, sequentially penetrating the bolt through a conductive metal pad, the two flanges, the other conductive metal pad and the bolt insulating pad, and finally screwing a nut to fix the two flanges;
and S2, welding the outgoing line on the conductive metal pad, and finally connecting the outgoing line with the potential indicator lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399230.0A CN115654235A (en) | 2022-11-09 | 2022-11-09 | Method and kit for steel pipeline insulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211399230.0A CN115654235A (en) | 2022-11-09 | 2022-11-09 | Method and kit for steel pipeline insulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115654235A true CN115654235A (en) | 2023-01-31 |
Family
ID=85016866
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211399230.0A Pending CN115654235A (en) | 2022-11-09 | 2022-11-09 | Method and kit for steel pipeline insulation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115654235A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115681826A (en) * | 2022-11-09 | 2023-02-03 | 四川利能燃气工程设计有限公司 | Fault detection method and kit for insulation failure of steel pipeline |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208670351U (en) * | 2018-07-26 | 2019-03-29 | 利拓密封绝缘技术(上海)有限公司 | Insulated enclosure gasket |
| CN211040022U (en) * | 2019-12-18 | 2020-07-17 | 成都市三为技术有限责任公司 | Flange insulation assembly with fault alarm function |
| CN211203235U (en) * | 2019-12-18 | 2020-08-07 | 成都市三为技术有限责任公司 | Pipeline flange insulation assembly with protection structure |
| CN112648442A (en) * | 2020-12-30 | 2021-04-13 | 西安利和愽机械制造有限公司 | Wind-force flange structure |
| CN213685712U (en) * | 2020-09-22 | 2021-07-13 | 利拓密封绝缘技术(上海)有限公司 | Inner-wrapping-edge integrated PTFE clamp spring insulation sealing gasket |
| CN213685713U (en) * | 2020-09-22 | 2021-07-13 | 利拓密封绝缘技术(上海)有限公司 | Fireproof insulating sealing gasket |
-
2022
- 2022-11-09 CN CN202211399230.0A patent/CN115654235A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208670351U (en) * | 2018-07-26 | 2019-03-29 | 利拓密封绝缘技术(上海)有限公司 | Insulated enclosure gasket |
| CN211040022U (en) * | 2019-12-18 | 2020-07-17 | 成都市三为技术有限责任公司 | Flange insulation assembly with fault alarm function |
| CN211203235U (en) * | 2019-12-18 | 2020-08-07 | 成都市三为技术有限责任公司 | Pipeline flange insulation assembly with protection structure |
| CN213685712U (en) * | 2020-09-22 | 2021-07-13 | 利拓密封绝缘技术(上海)有限公司 | Inner-wrapping-edge integrated PTFE clamp spring insulation sealing gasket |
| CN213685713U (en) * | 2020-09-22 | 2021-07-13 | 利拓密封绝缘技术(上海)有限公司 | Fireproof insulating sealing gasket |
| CN112648442A (en) * | 2020-12-30 | 2021-04-13 | 西安利和愽机械制造有限公司 | Wind-force flange structure |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115681826A (en) * | 2022-11-09 | 2023-02-03 | 四川利能燃气工程设计有限公司 | Fault detection method and kit for insulation failure of steel pipeline |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2985681C (en) | Double-rail serrated metal gasket | |
| CN115654235A (en) | Method and kit for steel pipeline insulation | |
| EA019245B1 (en) | Isolation gasket, system and method of manufacture | |
| US10094474B2 (en) | Double-shoulder, double-rail serrated metal gasket | |
| CN101897076B (en) | Electrolytic corrosion prevention structure and waveguide connection structure | |
| CN211040022U (en) | Flange insulation assembly with fault alarm function | |
| CN209293787U (en) | A kind of underground electrical equipment connection sealing structure and pressure measuring unit | |
| CN215567198U (en) | Corrosion-resistant self-lubricating thrust washer | |
| CN109281656A (en) | A kind of underground electrical equipment connection sealing structure and pressure measuring unit | |
| CN213685713U (en) | Fireproof insulating sealing gasket | |
| CN214368496U (en) | Flange sealing member for PTFE (Polytetrafluoroethylene) pipe | |
| CN211875396U (en) | Explosion-proof high pressure resistant rotary compensator | |
| KR200181300Y1 (en) | Protecting system from galvanic corrosion in flange coupling | |
| CN219734592U (en) | Stainless steel elbow with good sealing effect | |
| CN219282674U (en) | Marine electric insulation connecting assembly for preventing seawater electrochemical corrosion | |
| CN202182272U (en) | Polyfluortetraethylene cathode protection insulating tube joint | |
| CN219639428U (en) | Insulating sealing ring pad | |
| CN214618411U (en) | Reducing tee joint with pressure bearing and reducing functions | |
| RU165757U1 (en) | INSULATING FLANGE CONNECTION TO PROTECT PIPELINES FROM CORROSION | |
| CN214789006U (en) | Oil-resistant sealing rubber ring | |
| CN218031938U (en) | Steel lining tetrafluoro pipe | |
| CN214275331U (en) | Titanium alloy gas cylinder installation pipeline electric insulation screwed joint based on platform under water | |
| CN114739567B (en) | Stainless steel pressure gauge convenient to installation for chemical industry | |
| CN213685717U (en) | V-shaped sealing element | |
| CN221374912U (en) | Corrosion-resistant wear-resistant expansion joint |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |