CN114509345A - Hydraulic pipe joint connecting piece connection strength test device and test method - Google Patents
Hydraulic pipe joint connecting piece connection strength test device and test method Download PDFInfo
- Publication number
- CN114509345A CN114509345A CN202111665147.9A CN202111665147A CN114509345A CN 114509345 A CN114509345 A CN 114509345A CN 202111665147 A CN202111665147 A CN 202111665147A CN 114509345 A CN114509345 A CN 114509345A
- Authority
- CN
- China
- Prior art keywords
- test
- pipe joint
- testing machine
- joint
- hydraulic
- 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
- 238000012360 testing method Methods 0.000 title claims abstract description 124
- 238000010998 test method Methods 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims description 8
- 238000006073 displacement reaction Methods 0.000 claims description 5
- 230000001066 destructive effect Effects 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000008676 import Effects 0.000 claims 2
- 239000002184 metal Substances 0.000 claims 1
- 230000000712 assembly Effects 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 abstract description 2
- 230000035882 stress Effects 0.000 description 3
- 239000007769 metal material Substances 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009429 distress Effects 0.000 description 1
- 238000013100 final test Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2853—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipe joints or seals
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The application provides a hydraulic pipe joint connecting piece joint strength test device, include: an upper holding handle, an upper connector, a transverse pin and a shunt are arranged; the upper part of the upper connector is transversely provided with a connecting hole, the lower part of the upper connector is provided with a plugging port, the connecting hole is designed into ports with different sizes according to different types of joint structures, the upper connector is connected with an upper clamping handle through a transverse pin, the upper clamping handle is connected with an upper clamping surface of a testing machine, and the plugging port is connected with the upper end of a pipe joint testing assembly; the flow divider is characterized in that a flow dividing inlet and a flow dividing outlet with preset angles are formed in the flow divider, the flow dividing inlet is used for being connected with a hydraulic pump, the flow dividing outlet is designed into different interfaces according to different types of pipe joint test assemblies, the flow dividing outlet is connected with the lower end of the pipe joint test assembly, and the flow divider is connected with a lower holding surface of a testing machine. The testing device can be automatically centered before the testing machine applies load, so that uncertain stress generated when the pipeline connecting piece is tightened is eliminated.
Description
Technical Field
The application belongs to the technical field of hydraulic pipeline tests, and particularly relates to a hydraulic pipe joint connecting piece connection strength test device and a test method.
Background
In an aircraft hydraulic system, the number of hydraulic pipe joints is numerous and widely distributed, the number of single aircraft is as many as thousands, and leakage of any pipe joint can cause failure of the aircraft hydraulic system, even major flight accidents, and is fatal in most cases. In major accidents of the aircraft, the problems caused by the pipe elements are of great importance. Therefore, the performance of the pipeline parts directly influences the performance and safety of the airplane.
The connection strength test of the pipe joint connection piece is an important test for checking the connection piece of the aircraft hydraulic pipeline, and is used for checking whether the pipe joint assembly can bear the axial load in use.
The GJB 3230 airplane hydraulic guide pipe and test method provides that the mounted test piece is mounted on a tensile testing machine, appropriate safety measures are taken, the test piece is subjected to tensile test while the test piece maintains the system working pressure, and the test piece is loaded at the speed of V4 +/-0.3 mm/min until the test piece leaks, is pulled off or is broken. The specific method of the joint strength test is not specified in the specification, and in the past test process, the test method is to design a test device or equipment for each test manufacturer according to the standard requirements. However, since the types of pipe joints and the installation modes of the test components are different, the difference of final test data can be caused by positive or negative stress generated by bending of the test components, deviation of the coaxial center of the testing machine and the like before tensile load is applied, and meanwhile, since the test components of the hydraulic pipe joints are combined parts, the coaxiality of the combined parts is different and are directly tightened, uncertain stress is easily generated, and the test result is inaccurate.
Disclosure of Invention
The application aims to provide a hydraulic pipe joint connecting piece connection strength testing device and a testing method, so as to solve or reduce at least one problem in the background art.
On one hand, the technical scheme provided by the application is as follows: the utility model provides a hydraulic pressure union coupling spare joint strength test device, test device includes: an upper holding handle, an upper connector, a transverse pin and a shunt are arranged;
the upper part of the upper connector is transversely provided with a connecting hole, the lower part of the upper connector is provided with a plugging port, the connecting hole is designed into ports with different sizes according to different types of joint structures, the upper connector is connected with an upper clamping handle through a transverse pin, the upper clamping handle is connected with an upper clamping surface of a testing machine, and the plugging port is connected with the upper end of a pipe joint testing assembly;
the flow divider is characterized in that a flow dividing inlet and a flow dividing outlet with preset angles are formed in the flow divider, the flow dividing inlet is used for being connected with a hydraulic pump, the flow dividing outlet is designed into different interfaces according to different types of pipe joint test assemblies, the flow dividing outlet is connected with the lower end of the pipe joint test assembly, and the flow divider is connected with a lower holding surface of a testing machine.
Furthermore, the upper connector and the shunt are made of metal materials.
Furthermore, the material strength of the upper connector and the diverter is not lower than the structural strength of the pipe joint test assembly.
On the other hand, the technical scheme provided by the application is as follows: a test method using the hydraulic pipe joint connection strength test apparatus as described in any one of the above, the test method comprising:
1) the hydraulic pump is connected with the flow dividing inlet of the flow divider, and good sealing connection is ensured;
2) the lower end of the pipe joint test assembly is screwed with the shunt outlet of the shunt according to the torque requirement, and the upper end of the pipe joint test assembly is connected with the plugging port of the upper joint without being screwed;
3) manually pressurizing air in the pipe joint test assembly by using a hydraulic pump, and screwing the pipe joint test assembly and the plugging port of the upper joint when oil is discharged from the upper end of the pipe joint test assembly;
4) clamping the installed tool to a testing machine, installing a protective cover, and resetting the force value of the testing machine;
5) editing test parameters according to requirements, setting the displacement speed of the testing machine to add the oil pressure of the hydraulic pump to the working pressure, and keeping the working pressure;
6) starting a test, observing whether the pipe joint test assembly leaks, is pulled off or is broken in the test process, if any one of the conditions occurs, considering that the test sample fails, and ending the test;
7) and (5) comparing with a minimum destructive power value table in the standard to judge whether the sample meets the requirement.
Further, the set displacement speed of the tester is 4 +/-0.3 mm/min.
The connection strength testing device and the connection structure of the testing machine are optimally designed, so that the testing device connected with the pipe joint testing assembly can be automatically centered before the testing machine applies a load, uncertain stress generated when the pipeline connecting piece is tightened is eliminated, a scientific and reasonable connection strength testing method is provided for the aircraft hydraulic pipeline connecting piece, the testing device is simple in structure and reliable in testing process, and the validity of the hydraulic pipeline testing method can be met.
Drawings
In order to more clearly illustrate the technical solutions provided by the present application, the following briefly introduces the accompanying drawings. It is to be expressly understood that the drawings described below are only illustrative of some embodiments of the invention.
Fig. 1 is a schematic view of a connection strength testing device for a hydraulic pipe joint connector according to the present application.
Reference numerals:
1-Upper grip shank
2-top connection
3-transverse pin
4-shunt
5-pipe joint test assembly
Detailed Description
In order to make the implementation objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be described in more detail below with reference to the drawings in the embodiments of the present application.
As shown in fig. 1, the connection strength testing device for the hydraulic pipe joint connector provided by the present application mainly includes an upper holding handle 1, an upper connector 2, a horizontal pin 3 and a flow divider 4 (or a lower mounting handle).
The upper part of the upper connector 2 is transversely provided with a connecting hole which is designed into interfaces with different sizes according to different types of joint structures, and the lower part of the upper connector 2 is provided with a plugging port 21. The joint of the upper connector 2 and the testing machine is of a hook split structure, namely, the upper connector is connected with the upper clamping handle 1 through the transverse pin 3, and the upper clamping handle 1 is connected with the upper clamping surface of the testing machine.
The flow divider 4 is internally provided with a flow dividing inlet 42 and a flow dividing outlet 41 which are 90 degrees mutually, the transverse flow dividing inlet 42 is used for connecting a hydraulic pump (not shown), the axial flow dividing outlet 41 is designed into different interfaces according to different types of hydraulic pipe joints and is connected with the lower end of the pipe joint test assembly 5, and the flow divider 4 is connected with the lower clamping surface of the testing machine.
In the present application, since the upper connector 2 and the shunt 4 are directly connected to the pipe joint test assembly 5, it is preferable that both the upper connector 2 and the shunt 4 be made of a metal material. Further, in order to ensure that the pipe joint test assembly 5 is damaged before the upper connector 2 or the flow divider 4 is damaged during the test, the material strength of the upper connector 2 and the flow divider 4 should not be lower than the structural strength of the pipe joint test assembly 5.
In addition, the connection strength test process of the hydraulic pipe joint connecting piece test device is as follows:
1) connecting the hydraulic pump to the split inlet 42 of the splitter 2 while ensuring good sealing connection;
2) the lower end of the pipe joint test assembly 5 is screwed with the shunt outlet 41 of the shunt 4 according to the torque requirement, and the upper end of the pipe joint test assembly 5 is connected with the plugging port 21 of the upper joint 21 but does not need to be screwed;
3) manually pressurizing air in the discharge pipe joint test assembly 5 by using a hydraulic pump, and screwing the pipe joint test assembly 5 and the plugging port 21 of the upper joint 2 when oil is emitted from the upper end of the pipe joint test assembly 5;
4) clamping the installed tool to a testing machine, installing a protective cover, and resetting the force value of the testing machine;
5) editing test parameters according to the requirements of GJB 3230, setting the displacement speed v of the testing machine to be 4 +/-0.3 mm/min, adding the oil pressure of the hydraulic pump to the working pressure, and maintaining the working pressure;
6) starting a test, observing whether the pipe joint test assembly 5 leaks, is pulled off or is broken in the test process, if any one of the conditions occurs, considering that the test sample fails, and ending the test;
7) and (5) comparing with a minimum destructive power value table in the standard to judge whether the sample meets the requirement.
The connection strength testing device and the connection structure of the testing machine are optimally designed, so that the testing device connected with the pipe joint testing assembly can be automatically centered before the testing machine applies a load, uncertain stress generated when the pipeline connecting piece is tightened is eliminated, a scientific and reasonable connection strength testing method is provided for the aircraft hydraulic pipeline connecting piece, the testing device is simple in structure and reliable in testing process, and the validity of the hydraulic pipeline testing method can be met.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. The utility model provides a hydraulic pressure union coupling spare joint strength test device which characterized in that, test device includes: an upper holding handle (1), an upper connector (2), a transverse pin (3) and a shunt (4);
the upper part of the upper connector (2) is transversely provided with a connecting hole, the lower part of the upper connector (2) is provided with a plugging port (21), the connecting hole is designed into ports with different sizes according to different types of joint structures, the upper connector (2) is connected with an upper clamping handle (1) through a transverse pin (3), the upper clamping handle (1) is connected with an upper clamping surface of a testing machine, and the plugging port (21) is connected with the upper end of a pipe joint testing assembly (5);
the interior reposition of redundant personnel of predetermined angle of reposition of redundant personnel import (42) and reposition of redundant personnel export (41) that have in shunt (4), reposition of redundant personnel import (42) are used for connecting the hydraulic pump, reposition of redundant personnel export (41) are according to the different type design of union joint test subassembly (5) different interfaces, reposition of redundant personnel export (41) are connected with the lower extreme of union joint test subassembly (5), and shunt (4) are connected with the lower holding face of testing machine.
2. The hydraulic pipe joint connecting piece connection strength test device according to claim 1, wherein the upper connector (2) and the flow divider (4) are made of metal.
3. The hydraulic pipe joint connection test device according to claim 2, wherein the material strength of the upper connector (2) and the flow divider (4) is not lower than the structural strength of the pipe joint test assembly (5).
4. A test method using the hydraulic pipe joint connection strength test apparatus according to any one of claims 1 to 3, wherein the test method comprises:
1) a flow dividing inlet (42) for connecting the hydraulic pump with the flow divider (2) and ensuring good sealing connection;
2) the lower end of the pipe joint test component (5) is screwed with the flow dividing outlet (41) of the flow divider (4) according to the torque requirement, and the upper end of the pipe joint test component (5) is connected with the plugging port (21) of the upper joint (21) but does not need to be screwed;
3) manually pressurizing air in the discharge pipe joint test assembly (5) by using a hydraulic pump, and screwing the pipe joint test assembly (5) and a plugging port (21) of the upper joint (2) when oil emerges from the upper end of the pipe joint test assembly (5);
4) clamping the installed tool to a testing machine, installing a protective cover, and resetting the force value of the testing machine;
5) editing test parameters according to requirements, setting the displacement speed of the testing machine to add the oil pressure of the hydraulic pump to the working pressure, and keeping the working pressure;
6) starting a test, observing whether the pipe joint test assembly (5) leaks, is pulled off or is broken in the test process, if any one of the conditions occurs, considering that the test sample fails, and ending the test;
7) and (5) comparing with a minimum destructive power value table in the standard to judge whether the sample meets the requirement.
5. The test method according to claim 4, wherein the set displacement speed of the test machine is 4 ± 0.3 mm/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111665147.9A CN114509345A (en) | 2021-12-31 | 2021-12-31 | Hydraulic pipe joint connecting piece connection strength test device and test method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111665147.9A CN114509345A (en) | 2021-12-31 | 2021-12-31 | Hydraulic pipe joint connecting piece connection strength test device and test method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114509345A true CN114509345A (en) | 2022-05-17 |
Family
ID=81548507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111665147.9A Pending CN114509345A (en) | 2021-12-31 | 2021-12-31 | Hydraulic pipe joint connecting piece connection strength test device and test method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114509345A (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6197546A (en) * | 1984-10-19 | 1986-05-16 | Power Reactor & Nuclear Fuel Dev Corp | Tester for reliability of pipe joint |
| CN201392293Y (en) * | 2009-03-11 | 2010-01-27 | 奇瑞汽车股份有限公司 | Fixture for universal tester pipe fitting pull-off tests |
| CN102012346A (en) * | 2010-12-29 | 2011-04-13 | 海盐管件制造有限公司 | Pipe joint separating force tester and testing method thereof |
| CN103868654A (en) * | 2014-03-31 | 2014-06-18 | 福建万昌消防产品检测有限公司 | Fire product test device |
| CN204964294U (en) * | 2015-08-31 | 2016-01-13 | 徐挺 | No flaring tubing assembly joint strength test fixture |
| CN106289959A (en) * | 2016-08-17 | 2017-01-04 | 中国商用飞机有限责任公司 | Detachable combined clamp for aviation pipeline connection strength test |
| CN107817167A (en) * | 2017-12-05 | 2018-03-20 | 中国航空综合技术研究所 | Pipeline fitting bonding strength test device and its method of testing |
| CN109612838A (en) * | 2018-12-24 | 2019-04-12 | 燕山大学 | A kind of pipe fitting pressure resistance fatigue experimental device and test method |
| CN212683842U (en) * | 2020-03-04 | 2021-03-12 | 衡水银利橡塑制品有限公司 | High-pressure rubber hose joint quick connecting device |
| CN214748779U (en) * | 2020-12-09 | 2021-11-16 | 武汉华中科大检测科技有限公司 | Prestressed plastic corrugated pipe drawing test device and drawing clamp |
-
2021
- 2021-12-31 CN CN202111665147.9A patent/CN114509345A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6197546A (en) * | 1984-10-19 | 1986-05-16 | Power Reactor & Nuclear Fuel Dev Corp | Tester for reliability of pipe joint |
| CN201392293Y (en) * | 2009-03-11 | 2010-01-27 | 奇瑞汽车股份有限公司 | Fixture for universal tester pipe fitting pull-off tests |
| CN102012346A (en) * | 2010-12-29 | 2011-04-13 | 海盐管件制造有限公司 | Pipe joint separating force tester and testing method thereof |
| CN103868654A (en) * | 2014-03-31 | 2014-06-18 | 福建万昌消防产品检测有限公司 | Fire product test device |
| CN204964294U (en) * | 2015-08-31 | 2016-01-13 | 徐挺 | No flaring tubing assembly joint strength test fixture |
| CN106289959A (en) * | 2016-08-17 | 2017-01-04 | 中国商用飞机有限责任公司 | Detachable combined clamp for aviation pipeline connection strength test |
| CN107817167A (en) * | 2017-12-05 | 2018-03-20 | 中国航空综合技术研究所 | Pipeline fitting bonding strength test device and its method of testing |
| CN109612838A (en) * | 2018-12-24 | 2019-04-12 | 燕山大学 | A kind of pipe fitting pressure resistance fatigue experimental device and test method |
| CN212683842U (en) * | 2020-03-04 | 2021-03-12 | 衡水银利橡塑制品有限公司 | High-pressure rubber hose joint quick connecting device |
| CN214748779U (en) * | 2020-12-09 | 2021-11-16 | 武汉华中科大检测科技有限公司 | Prestressed plastic corrugated pipe drawing test device and drawing clamp |
Non-Patent Citations (2)
| Title |
|---|
| 张凌云;李长庆;: "无扩口导管组件连接强度试验及夹具设计", 沈阳航空航天大学学报, no. 05, pages 1 - 4 * |
| 张凌云;李长庆;: "无扩口导管组件连接强度试验及夹具设计", 沈阳航空航天大学学报, vol. 28, no. 05, 31 October 2011 (2011-10-31), pages 1 - 4 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10704975B2 (en) | Visual torque indication for threaded joints | |
| CN113447272B (en) | Aeroengine blade subassembly anchor clamps | |
| CN103487215B (en) | There is in a direction leakage detection clamp in multilayer shutoff face | |
| CN109724873B (en) | CT sample crack propagation test fixture suitable for tension and compression loads | |
| CN114509345A (en) | Hydraulic pipe joint connecting piece connection strength test device and test method | |
| CN202710399U (en) | Composite-material laminate bolt connection extruding strength single-lap joint test fixture | |
| CN112730075B (en) | Pressure testing device and method for aviation pipeline connecting piece system | |
| CN111692431B (en) | Destressing installation method of pipe connection quick-release clamp | |
| CN109520831A (en) | One kind being bolted slow test tooling, pilot system and application method | |
| CN110966480B (en) | Sealing device | |
| CN109490115B (en) | Test piece and method for testing tensile detail fatigue rating of oblique installation of bolt | |
| CN209148432U (en) | A kind of cold spraying metal coating bond strength test device | |
| CN108107285A (en) | A kind of Portable aircraft electrical malfunction somascope | |
| KR20230157179A (en) | Apparatus for Pressure Safety Valve Calibration and Popping Operation Pressure test | |
| CN213336683U (en) | Pressure test tool for tube bundle of air cooler | |
| CN109738300B (en) | Bending shear combined test device for pin shaft type components | |
| JP2021517257A (en) | High-pressure hose strength tester for loading and unloading | |
| CN208383384U (en) | A kind of universal pressure sensor test device | |
| CN219624891U (en) | Vibration acceleration sensor fixing tool for vibration test of hydraulic pipeline of airplane | |
| CN220649931U (en) | Casing rupture disc pressure testing device | |
| CN111521382A (en) | High-precision fatigue test tool | |
| CN219866790U (en) | Ball head tool for eliminating pipeline installation offset | |
| CN219529463U (en) | Special quick-operation joint testing platform | |
| CN111006823A (en) | Self-sealing test flange and sealing monitoring method | |
| CN215677430U (en) | Testing device for air entraining valve actuating cylinder |
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 |