CN109442133B - Self-sealing blind plate for testing gas valve - Google Patents
Self-sealing blind plate for testing gas valve Download PDFInfo
- Publication number
- CN109442133B CN109442133B CN201811515333.2A CN201811515333A CN109442133B CN 109442133 B CN109442133 B CN 109442133B CN 201811515333 A CN201811515333 A CN 201811515333A CN 109442133 B CN109442133 B CN 109442133B
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- CN
- China
- Prior art keywords
- piston ring
- shell
- ring
- sealing
- base
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- 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.)
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- 238000007789 sealing Methods 0.000 title claims abstract description 71
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 239000003921 oil Substances 0.000 claims abstract description 11
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 7
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/10—Means for stopping flow from or in pipes or hoses
- F16L55/115—Caps
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
Abstract
The invention relates to a self-sealing blind plate for testing a gas valve, which comprises a base, a shell, an outer piston ring and an inner piston ring, wherein the shell is of a tubular structure and is fixedly connected with the base, and one end of the shell, which is far away from the base, is provided with an annular baffle plate; the inner piston ring and the outer piston ring are tightly attached together and can move relatively along the axial direction, the outer piston ring is embedded into the shell, and a main sealing O-shaped ring is arranged between the outer piston ring and the annular baffle; the base is provided with an inner pipe body concentric with the inner piston ring and inserted into the inner piston ring, and the inner piston ring is clung to the outer wall of the inner pipe body and can move along the inner pipe body; one end of the inner piston ring is provided with an inclined plane matched with the inclined plane on the short pipes on two sides of the valve, a reset spring is arranged between the other end of the inner piston ring and the base, a closed oil storage cavity is formed among the base, the shell, the outer piston ring and the inner piston ring, and the oil storage cavity is filled with hydraulic oil. When the notch plate is used for carrying out pressure test on the gas valve, the sealing effect is good, and the test result is accurate.
Description
Technical Field
The invention relates to a self-sealing blind plate for testing a gas valve, and belongs to the technical field of pipeline gas equipment.
Background
According to the connection mode, two types of gas valves are provided, one type is a flange-connected gas valve, and the gas valve is suitable for a medium-pressure gas pipeline; the other is a welded gas valve, which is suitable for high-pressure gas pipelines. When the welded gas valve is subjected to pressure test, two ends of the test valve are usually inserted into blind plates positioned on two sides of a valve pressure test bed, two ends of the gas valve are blocked through the blind plates, and test pressure enters the valve through connecting holes of the pressure test bed arranged on the blind plates.
In testing welded gas valves, the blind plates and the valve's end stubs typically employ the following two seal arrangements: the first sealing structure is that a groove is directly processed at the inner diameter of the blind plate, then an O-shaped sealing ring is assembled, so that the inner diameter of the O-shaped sealing ring is smaller than the outer diameter of a short pipe at the end part of the valve, and when the end part of the valve passes through the O-shaped sealing ring, the valve is directly sealed; the problem that this structure exists is, pass O shape sealing washer in-process at valve tip nozzle stub, with the sealing washer damage easily, and when the excircle roundness of valve tip nozzle stub is not good moreover, hardly inserts in the blind plate, perhaps even just barely inserts, thereby the sealed effect is also not good and influences the test result. The second sealing structure is that a groove is processed at the bottom of the blind plate, then an O-shaped sealing ring is assembled, the O-shaped sealing ring protrudes out of the bottom plane of the blind plate, and the sealing is carried out after the valve end part and the O-shaped sealing ring are compressed; this structure has the disadvantage that when the valve is subjected to a pressure test, there is always an external force in the axial direction of the valve, which affects the final test result.
Disclosure of Invention
The invention aims at: the defects of the prior art are overcome, and the self-sealing blind plate with good sealing effect and accurate test result when the gas valve is subjected to pressure test is provided.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: the self-sealing blind plate for testing the gas valve is characterized in that slope surfaces are arranged on short pipes on two sides of the valve, and a pressure test bed connecting hole is formed in the self-sealing blind plate; the self-sealing blind plate comprises a base, a shell, an outer piston ring and an inner piston ring, wherein the shell is of a tubular structure and is fixedly connected with the base, and one end of the shell, which is far away from the base, is provided with an annular baffle extending towards the axial direction of the shell; the inner piston ring and the outer piston ring are arranged concentrically, the inner piston ring and the outer piston ring are clung together and can move relatively along the axial direction, the outer piston ring is embedded into the shell, the outer piston ring is clung to the inner wall of the shell and can move along the shell, and a main sealing O-shaped ring is arranged between the outer piston ring and the annular baffle; the base is provided with an inner pipe body concentric with the inner piston ring and inserted into the inner piston ring, and the inner piston ring is clung to the outer wall of the inner pipe body and can move along the inner pipe body; one end of the inner piston ring is provided with an inclined plane matched with the inclined plane on the short pipes on two sides of the valve, a reset spring is arranged between the other end of the inner piston ring and the base, a closed oil storage cavity is formed among the base, the shell, the outer piston ring and the inner piston ring, and the oil storage cavity is filled with hydraulic oil.
In the invention, a certain gap can exist between the inner diameter of the self-sealing blind plate and the outer diameter of the short pipe at the end part of the valve, the main sealing O-shaped ring is compressed by the outer piston ring to be sealed in a forced way, and the phenomena of damage to the main sealing O-shaped ring and poor sealing effect are avoided.
When the self-sealing blind plate testing device is used, the two self-sealing blind plates are respectively arranged on two sides of a valve pressure test bed, short pipes at two ends of a tested valve are inserted into the self-sealing blind plates, the slope surface on the short pipe at the end presses the inner piston ring to move to a preset distance, then the inner piston ring is pressed into the tested valve, testing pressure enters the valve through the connecting hole of the pressure test bed on the blind plate, the main sealing O-shaped ring in the self-sealing blind plate is sealed with the outer diameter of the short pipe at the end of the tested valve, and the testing pressure is ensured to be always kept in the tested valve. When pressure exists in the tested valve and the self-sealing blind plate, the pressure also acts on the right end surfaces of the inner piston ring and the outer piston ring, the inner test pressure continues to push the inner piston ring inwards, hydraulic oil in the oil storage cavity is pressed to push the outer piston ring outwards, and the main sealing O-shaped ring is further compressed, so that the sealing between the main sealing O-shaped ring and the outer diameter of the end part of the tested valve is more reliable. At this time, the inclined plane of the end part of the tested valve is not contacted with the inclined plane of the end part of the inner piston ring, namely, the end part of the valve is not contacted with anything in the pressure testing process of the self-sealing blind plate, namely, the tested valve has no external force in the axial direction, so that the tested data is more reliable.
After the test is finished and the pressure is released, the inner ring of the piston moves outwards under the action of the spring, the outer piston moves inwards, the compression amount between the main sealing O-shaped ring and the end part of the tested valve is reduced, and after the end part of the tested valve exits from the blind plate for a small distance, the outer circle of the end part of the tested valve is separated from the inner diameter of the main sealing O-shaped ring, so that the end part of the tested valve can be easily pulled away from the blind plate.
In order to further ensure the sealing effect, sealing rings are arranged between the outer piston ring and the inner wall of the shell, between the inner piston ring and the outer wall of the inner pipe body and between the outer piston ring and the inner piston ring.
The invention can also be improved as follows:
1) The inner wall of the shell is in a step shape, the inner diameter of the part, close to the annular baffle, of the shell is smaller than that of the part, far away from the annular baffle, of the shell, correspondingly, the outer piston ring is also in a step shape, and the outer diameter of the part, close to the annular baffle, of the outer piston ring is smaller than that of the part, far away from the annular baffle. Therefore, the outer piston ring can be limited, and the situation that the normal use is influenced due to the fact that the stroke of the outer piston ring is too long when the pressure of hydraulic oil is too large is prevented.
2) And one end of the outer piston ring, which is close to the annular baffle plate, is provided with an annular check ring extending towards the axial direction of the outer piston ring. The annular retainer ring can limit the inner piston ring, so that the spring and the like are prevented from being damaged. Preferably, the radius of the inner surface of the annular retainer ring is the same as that of the inner surface of the annular baffle.
Drawings
The invention is further described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of an embodiment of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is a schematic diagram of the working principle of an embodiment of the present invention.
Reference numerals: the device comprises a base, a 2-shell, a 3-screw, a 4-outer piston ring, a 5-inner piston ring, a 6-spring, a 7-main sealing O-shaped ring, 8-hydraulic oil, 9-sealing ring, 10-sealing ring, 11-sealing ring, 12-annular baffle, 13-annular baffle, 14-tested valve, 15-pressure test bench connecting hole, 16-oil storage cavity, 17-slope surface, 18-slope surface and 19-inner pipe.
Detailed Description
Examples
The gas valve for welded connection is different from the gas valve for flange connection, and the short pipes on two sides of the gas valve for welded connection are provided with slope surfaces, so that the embodiment is just to utilize the slope to improve the blind plate for testing the pressure.
As shown in fig. 1-3, the self-sealing blind plate for testing a gas valve in this embodiment includes a base 1, a housing 2, an outer piston ring 4 and an inner piston ring 5, where the housing 2 is generally in a tubular structure and is fixedly connected to the base 1, and one end of the housing 2 away from the base 1 is provided with an annular baffle 13 extending toward the axial direction of the housing 2.
As shown in fig. 1 and 2, an inner piston ring 5 and an outer piston ring 4 are concentrically arranged, the inner piston ring 5 and the outer piston ring 4 are tightly attached together and can move relatively along the axial direction, the outer piston ring 4 is embedded into the shell 2, the outer piston ring 4 is tightly attached to the inner wall of the shell 2 and can move along the shell 4, and a main sealing O-shaped ring 7 is arranged between the outer piston ring 4 and the annular baffle 13; the base 1 is provided with an inner pipe body 19 concentric with the inner piston ring 5 and inserted into the inner piston ring 5, and the inner piston ring 5 is tightly attached to the outer wall of the inner pipe body 19 and can move along the inner pipe body 19.
As shown in fig. 1-3, one end of the inner piston ring 5 is provided with an inclined surface 18 which is matched with the inclined surface 17 on the short pipes on two sides of the valve, a return spring 6 is arranged between the other end of the inner piston ring 5 and the base 1, a closed oil storage cavity 16 is formed among the base 1, the shell 2, the outer piston ring 4 and the inner piston ring 5, and the oil storage cavity 16 is filled with hydraulic oil 8.
In order to further ensure the sealing effect, sealing rings 11, 9 and 10 are respectively arranged between the outer piston ring 4 and the inner wall of the shell 2, between the inner piston ring 5 and the outer wall of the inner pipe body 19 and between the outer piston ring 4 and the inner piston ring 5.
In the invention, a certain gap can exist between the inner diameter of the self-sealing blind plate and the outer diameter of the short pipe at the end part of the valve, so that the end part of the valve can be conveniently inserted into the blind plate, the main sealing O-shaped ring 7 is compressed by the outer piston ring 4 to be sealed in a forced way, and the phenomena of damaging the main sealing O-shaped ring 7 and poor sealing effect can not occur.
When the self-sealing blind plate testing device is used, two self-sealing blind plates are respectively arranged on two sides of a valve pressure test bed, short pipes at two ends of a tested valve are inserted into the self-sealing blind plates, a slope surface 17 on the short pipe at the end part presses an inner piston ring 5 to move to a preset distance, then the inner piston ring is pressed into the tested valve, testing pressure enters the valve through a connecting hole 15 of the pressure test bed on the blind plate, a main sealing O-shaped ring 7 in the self-sealing blind plate is sealed with the outer diameter of the short pipe at the end part of the tested valve, and the testing pressure is ensured to be always kept in the tested valve. When pressure exists in the tested valve and the self-sealing blind plate, the pressure also acts on the right end surfaces of the inner piston ring and the outer piston ring, the inner test pressure continues to push the inner piston ring 5 inwards, hydraulic oil 8 in the oil storage cavity 16 is pressed to push the outer piston ring 4 outwards, and the main sealing O-shaped ring 7 is further compressed, so that the sealing between the main sealing O-shaped ring and the outer diameter of the end part of the tested valve is more reliable. At this time, as shown in fig. 3, the inclined surface 17 of the valve end to be tested is no longer in contact with the inclined surface 18 of the inner piston ring end, thereby improving the reliability of the test data.
After the test is finished and the pressure is released, the piston inner ring 5 moves outwards under the action of the spring 6, the outer piston ring 4 moves inwards, the compression amount between the main sealing O-shaped ring 7 and the end part of the tested valve is reduced, and after the end part of the tested valve exits from the blind plate for a small distance, the outer circle of the end part of the tested valve is separated from the inner diameter of the main sealing O-shaped ring, and the end part of the tested valve can be easily pulled away from the blind plate.
As shown in fig. 1 and 2, this embodiment can be modified as follows:
1) The inner wall of the housing 2 is stepped, the inner diameter of the part of the housing 2 close to the annular baffle 12 is smaller than that of the part far away from the annular baffle 12, and correspondingly, the outer piston ring 4 is also stepped, and the outer diameter of the part of the outer piston ring 4 close to the annular baffle 12 is smaller than that of the part far away from the annular baffle 12. Therefore, the outer piston ring can be limited, and the situation that the normal use is influenced due to the fact that the stroke of the outer piston ring is too long when the pressure of hydraulic oil is too large is prevented.
2) The outer piston ring 4 is provided with an annular retainer ring 13 extending in the axial direction thereof at one end thereof adjacent to the annular baffle plate 13. The annular retainer ring 13 can limit the inner piston ring 5, prevent the damage of the spring 6 and the like. Preferably, the radius of the inner surface of the annular collar 13 is the same as the radius of the inner surface of the annular baffle 12.
The present invention is not limited to the specific technical solutions of the above embodiments, and other embodiments may be provided in addition to the above embodiments. All technical schemes formed by equivalent substitution or equivalent transformation fall within the protection scope of the invention.
Claims (3)
1. The self-sealing blind plate for testing the gas valve is characterized in that slope surfaces are arranged on short pipes on two sides of the valve, and a pressure test bed connecting hole is formed in the self-sealing blind plate; the method is characterized in that: the self-sealing blind plate comprises a base, a shell, an outer piston ring and an inner piston ring, wherein the shell is of a tubular structure and is fixedly connected with the base, and one end of the shell, which is far away from the base, is provided with an annular baffle extending towards the axial direction of the shell;
the inner wall of the shell is in a step shape, the inner diameter of the part, close to the annular baffle, of the shell is smaller than that of the part, far away from the annular baffle, of the shell, correspondingly, the outer piston ring is also in a step shape, and the outer diameter of the part, close to the annular baffle, of the outer piston ring is smaller than that of the part, far away from the annular baffle;
the inner piston ring and the outer piston ring are arranged concentrically, the inner piston ring and the outer piston ring are clung together and can move relatively along the axial direction, the outer piston ring is embedded into the shell, the outer piston ring is clung to the inner wall of the shell and can move along the shell, and a main sealing O-shaped ring is arranged between the outer piston ring and the annular baffle;
the base is provided with an inner pipe body concentric with the inner piston ring and inserted into the inner piston ring, and the inner piston ring is clung to the outer wall of the inner pipe body and can move along the inner pipe body;
one end of the inner piston ring is provided with an inclined plane matched with the inclined plane on the short pipes at two sides of the valve, a return spring is arranged between the other end of the inner piston ring and the base, a closed oil storage cavity is formed among the base, the shell, the outer piston ring and the inner piston ring, and the oil storage cavity is filled with hydraulic oil;
and one end of the outer piston ring, which is close to the annular baffle plate, is provided with an annular check ring extending towards the axial direction of the outer piston ring.
2. The self-sealing blind plate for testing a gas valve of claim 1, wherein: sealing rings are arranged between the outer piston ring and the inner wall of the shell, between the inner piston ring and the outer wall of the inner pipe body and between the outer piston ring and the inner piston ring.
3. The self-sealing blind plate for testing gas valves according to claim 1 or 2, characterized in that: the radius of the inner surface of the annular retainer ring is the same as that of the inner surface of the annular baffle plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811515333.2A CN109442133B (en) | 2018-12-12 | 2018-12-12 | Self-sealing blind plate for testing gas valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811515333.2A CN109442133B (en) | 2018-12-12 | 2018-12-12 | Self-sealing blind plate for testing gas valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109442133A CN109442133A (en) | 2019-03-08 |
| CN109442133B true CN109442133B (en) | 2024-04-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811515333.2A Active CN109442133B (en) | 2018-12-12 | 2018-12-12 | Self-sealing blind plate for testing gas valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN109442133B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113944821B (en) * | 2021-10-08 | 2023-03-24 | 合肥双诺建筑结构工程有限公司 | Plugging device suitable for municipal pre-buried water holding pipeline and installation method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3331238A (en) * | 1964-02-29 | 1967-07-18 | Kocks Gmbh Friedrich | Sealing and clamping head for an end of a tube to be pressure-tested |
| US5483991A (en) * | 1993-05-12 | 1996-01-16 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." | Valve with self-centering seat |
| US5676174A (en) * | 1995-06-23 | 1997-10-14 | Est Group, Inc. | Outer diameter pipe plug |
| CN201233301Y (en) * | 2008-08-07 | 2009-05-06 | 陈崇南 | Novel ultra-high pressure self-sealing pressure testing blind plate assembly |
| CN201420929Y (en) * | 2009-04-30 | 2010-03-10 | 西安泵阀总厂有限公司 | Lock ring-type quickly detachable blind plate |
| EP3249374A1 (en) * | 2016-05-28 | 2017-11-29 | Veltec GmbH | Pressure testing device |
| CN207215380U (en) * | 2017-08-28 | 2018-04-10 | 四川沃兰特阀门制造有限公司 | A kind of bootstrapping structure for pressure test of Valve pressure test device |
| CN207300746U (en) * | 2017-07-10 | 2018-05-01 | 江阴兴澄钢管有限公司 | A kind of Steel Tube Special sealing device for water pressure test |
| CN108139290A (en) * | 2015-09-07 | 2018-06-08 | 瓦卢瑞克石油天然气法国有限公司 | For the pressure test corking of improved tubular thread component |
| CN209557880U (en) * | 2018-12-12 | 2019-10-29 | 苏州市燃气设备阀门制造有限公司 | For testing the self-sealing blind plate of burnt gas valve |
-
2018
- 2018-12-12 CN CN201811515333.2A patent/CN109442133B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3331238A (en) * | 1964-02-29 | 1967-07-18 | Kocks Gmbh Friedrich | Sealing and clamping head for an end of a tube to be pressure-tested |
| US5483991A (en) * | 1993-05-12 | 1996-01-16 | Societe Nationale D'etude Et De Construction De Moteurs D'aviation "S.N.E.C.M.A." | Valve with self-centering seat |
| US5676174A (en) * | 1995-06-23 | 1997-10-14 | Est Group, Inc. | Outer diameter pipe plug |
| CN201233301Y (en) * | 2008-08-07 | 2009-05-06 | 陈崇南 | Novel ultra-high pressure self-sealing pressure testing blind plate assembly |
| CN201420929Y (en) * | 2009-04-30 | 2010-03-10 | 西安泵阀总厂有限公司 | Lock ring-type quickly detachable blind plate |
| CN108139290A (en) * | 2015-09-07 | 2018-06-08 | 瓦卢瑞克石油天然气法国有限公司 | For the pressure test corking of improved tubular thread component |
| EP3249374A1 (en) * | 2016-05-28 | 2017-11-29 | Veltec GmbH | Pressure testing device |
| CN207300746U (en) * | 2017-07-10 | 2018-05-01 | 江阴兴澄钢管有限公司 | A kind of Steel Tube Special sealing device for water pressure test |
| CN207215380U (en) * | 2017-08-28 | 2018-04-10 | 四川沃兰特阀门制造有限公司 | A kind of bootstrapping structure for pressure test of Valve pressure test device |
| CN209557880U (en) * | 2018-12-12 | 2019-10-29 | 苏州市燃气设备阀门制造有限公司 | For testing the self-sealing blind plate of burnt gas valve |
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| Publication number | Publication date |
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| CN109442133A (en) | 2019-03-08 |
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