CN110715136A - End enclosure device applied to large-diameter pipe fitting container - Google Patents

End enclosure device applied to large-diameter pipe fitting container Download PDF

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Publication number
CN110715136A
CN110715136A CN201910969205.3A CN201910969205A CN110715136A CN 110715136 A CN110715136 A CN 110715136A CN 201910969205 A CN201910969205 A CN 201910969205A CN 110715136 A CN110715136 A CN 110715136A
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CN
China
Prior art keywords
pipe fitting
end socket
fixing sleeve
socket body
hole
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.)
Withdrawn
Application number
CN201910969205.3A
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Chinese (zh)
Inventor
李小平
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pizhou Tiefu Kowloon Public Service Co Ltd
Original Assignee
Pizhou Tiefu Kowloon Public Service Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pizhou Tiefu Kowloon Public Service Co Ltd filed Critical Pizhou Tiefu Kowloon Public Service Co Ltd
Priority to CN201910969205.3A priority Critical patent/CN110715136A/en
Publication of CN110715136A publication Critical patent/CN110715136A/en
Withdrawn legal-status Critical Current

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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/10Means for stopping flow from or in pipes or hoses
    • F16L55/115Caps
    • F16L55/1152Caps fixed by screwing or by means of a screw-threaded ring

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)

Abstract

The invention relates to a head sealing device applied to a large-diameter pipe container, which comprises a head sealing body covered on a pipe, wherein the bottom of the head sealing body is provided with a fixed sleeve matched with the pipe, the periphery of the head sealing body is connected with the pipe through a fastening bolt, the invention changes the connection mode between the prior head sealing device and a device to be connected into a detachable connection mode, the bottom of the seal head body is provided with a fixed sleeve which has a fixing function together, the fixed sleeve and the devices to be connected are connected in a threaded connection mode, meanwhile, a plurality of bearing platforms are arranged on the periphery of the seal head body, a first through hole is arranged on the bearing platform and is connected with a device to be connected through a fastening bolt, the detachable connection mode is convenient for change the head body of damage and has made things convenient for maintain the head body.

Description

End enclosure device applied to large-diameter pipe fitting container
Technical Field
The invention belongs to the technical field of pipe fittings, and particularly relates to a sealing head device applied to a large-diameter pipe fitting container.
Background
As is known, a seal head is an element for sealing an end of a container to isolate internal and external media, and is also called an end cap, a seal head of a cylindrical container is generally a revolving shell and can be divided into a convex shape, a conical shape, a flat plate shape and a combined shape according to the shape of the surface of the seal head, a convex seal head is a seal head with a convex surface shape, such as a hemispherical shape, an oval shape, a dish shape, a non-folded edge spherical seal head and the like, an existing gas cylinder adopts a combined bottom seal head with an inward convex surface, and the connection between the seal head and a pipe fitting or the container is not detachable after the seal head device is installed in.
Disclosure of Invention
In view of the problems in the background, the invention aims to provide a sealing device applied to a large-diameter pipe container.
In order to achieve the purpose, the invention provides a sealing head device applied to a large-diameter pipe fitting container, which comprises a sealing head body covered on a pipe fitting, wherein the sealing head body is bowl-shaped and is reversely buckled on the pipe fitting, the bottom of the peripheral edge of the sealing head body is tightly attached to the end surface of the top of the pipe fitting, the bottom of the sealing head body is provided with a fixing sleeve matched with the pipe fitting, the fixing sleeve and the sealing head body are coaxially arranged, one end of the fixing sleeve and the bottom of the sealing head body are mutually connected and extend towards the direction of the pipe fitting, the top of the pipe fitting is provided with a first mounting hole, the first mounting hole is provided with an internal thread, the periphery of the sealing head body is provided with at least two bearing platforms, the bearing platforms protrude out of the outer surface of the sealing head body, the bearing platforms are provided with first through holes, the first through holes are provided with internal threads matched with the internal thread of, the fastening bolt is provided with an external thread matched with the internal thread of the first through hole, penetrates through the first through hole through the matching of the external thread, the internal thread of the first through hole and the internal thread of the first mounting hole, and abuts against the first mounting hole to connect the seal head body and the pipe fitting.
In order to increase the connection stability between the pipe fitting of head body and required connection, prevent that the relative pipe fitting of head body from sliding and causing the dislocation, the top end face of pipe fitting is provided with first fixed part, the peripheral edge bottom of head body be provided with the second fixed part that first fixed part matches each other, the second fixed part passes through the cooperation restriction head body with first fixed part and follows the horizontal direction motion.
In order to increase the sealing performance of the joint between the end socket body and the pipe fitting required to be connected, a sealing gasket is arranged between the first fixing part and the second fixing part, and the cross section of the sealing gasket is L-shaped.
In order to increase the wear resistance of the pipe fittings and the fixed sleeve to be connected and further prolong the service life of equipment, the inner wall of each pipe fitting and the outer wall of each fixed sleeve are respectively provided with a nitriding layer, and the thickness of each nitriding layer is 0.2-0.35 mm.
In order to increase the connection strength between the fixing sleeve and the seal head body, a reinforcing ring is arranged between the fixing sleeve and the seal head body, and the reinforcing ring is uniformly arranged along the connection part of the fixing sleeve and the seal head body.
Furthermore, in order to increase the connection strength between the fixing sleeve and the end socket body, a mode of arranging reinforcing ribs can be further adopted, the reinforcing ribs are arranged between the fixing sleeve and the end socket body, the number of the reinforcing ribs is at least two, and the reinforcing ribs are arranged in an axial symmetry mode relative to the axis of the fixing sleeve.
Compared with the prior art, the invention has the beneficial effects that: the invention relates to a head sealing device applied to a large-diameter pipe fitting container, which comprises a head sealing body covered on a pipe fitting, wherein the head sealing body is bowl-shaped and is reversely buckled on the pipe fitting, the bottom of the peripheral edge of the head sealing body is tightly attached to the top end surface of the pipe fitting, the bottom of the head sealing body is provided with a fixing sleeve matched with the pipe fitting, the fixing sleeve and the head sealing body are coaxially arranged, one end of the fixing sleeve and the bottom of the head sealing body are mutually connected and extend towards the direction of the pipe fitting, the top of the pipe fitting is provided with a first mounting hole, the first mounting hole is provided with internal threads, the periphery of the head sealing body is provided with at least two bearing platforms, the bearing platforms protrude out of the outer surface of the head sealing body, the bearing platforms are provided with first through holes, the first through holes are provided with internal threads matched with the internal threads of the first, the fastening bolt is provided with an external thread matched with the internal thread of the first through hole, penetrates through the first through hole through the matching of the external thread, the internal thread of the first through hole and the internal thread of the first mounting hole and is abutted against the first mounting hole to connect the end socket body and the pipe fitting, the invention changes the connection mode between the traditional end socket device and the devices to be connected, changes the fixed connection mode into the detachable connection mode, the bottom of the seal head body is provided with a fixed sleeve which has a fixing function together, the fixed sleeve and the devices to be connected are connected in a threaded connection mode, meanwhile, a plurality of bearing platforms are arranged on the periphery of the seal head body, a first through hole is arranged on the bearing platform and is connected with a device to be connected through a fastening bolt, the detachable connection mode is convenient for change the head body of damage and has made things convenient for maintain the head body.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a second embodiment of the present invention.
In the drawings, the reference numbers: 1. a pipe fitting; 2. a seal head body; 3. fixing the sleeve; 4. a first mounting hole; 5. a bearing platform; 6. a first through hole; 7. fastening a bolt; 8. a first fixed part; 9. a second fixed part; 10. a gasket; 11. a nitride layer; 12. a reinforcement ring; 13. and (5) reinforcing ribs.
Detailed Description
In order that the technical solutions of the present invention will be more apparent, the present invention is further described in detail with reference to the following examples, it should be understood that the specific embodiments described herein are only for the purpose of illustrating the present invention, and are not to be construed as limiting the present invention.
Referring to the attached drawings, the end socket device applied to the large-diameter pipe fitting container comprises an end socket body 2 covered on a pipe fitting 1, wherein the end socket body 2 is bowl-shaped and is reversely buckled on the pipe fitting 1, the bottom of the peripheral edge of the end socket body 2 is tightly attached to the end surface of the top of the pipe fitting 1, the bottom of the end socket body 2 is provided with a fixing sleeve 3 matched with the pipe fitting 1, the fixing sleeve 3 and the end socket body 2 are coaxially arranged, one end of the fixing sleeve 3 is connected with the bottom of the end socket body 2 and extends towards the direction of the pipe fitting 1, the top of the pipe fitting 1 is provided with a first mounting hole 4, the first mounting hole 4 is provided with an internal thread, the periphery of the end socket body 2 is provided with at least two bearing platforms 5, the bearing platforms 5 protrude out of the outer surface of the end socket body 2, the bearing platforms 5 are provided with first through holes 6, the first through holes 6 are provided with internal, the fastening bolt 7 is arranged in the first through hole 6 and the first mounting hole 4, the fastening bolt 7 is provided with an external thread matched with the internal thread of the first through hole 6, the fastening bolt 7 penetrates through the first through hole 6 through the matching of the external thread, the internal thread of the first through hole 6 and the internal thread of the first mounting hole 4 and is abutted against the first mounting hole 4 to connect the end socket body 2 and the pipe fitting 1, the traditional end socket assembly and the pipe fitting 1 are fixedly connected at one time in a welding mode when being connected, when the end socket fails, the end socket is inconvenient to replace or maintain, the invention arranges a fixing sleeve 3 at the bottom of the end socket body 2, the fixing sleeve 3 is matched with the pipe fitting 1 to be connected, the fixing sleeve can be connected through the threads, when the invention is mounted, the invention is firstly buckled to the pipe fitting 1 to be connected, and then the invention is screwed, the fixing sleeve 3 gradually penetrates into the pipe fitting 1, the bottom of the periphery of the end socket body 2 is tightly attached to the top of the pipe fitting 1, a plurality of bearing platforms 5 are arranged at the periphery edge of the end socket body 2, first through holes 6 are formed in the bearing platforms 5, first mounting holes 4 matched with the first through holes 6 are formed in the top of the pipe fitting 1, fastening bolts 7 penetrate through the first through holes 6 and abut against the first mounting holes 4, the end socket body 2 and the pipe fitting 1 are fastened, and the installation of the pipe fitting is completed.
Preferably, the top end face of pipe fitting 1 is provided with first fixed part 8, the peripheral edge bottom of head body 2 be provided with second fixed part 9 that first fixed part 8 matches each other, second fixed part 9 through with first fixed part 8 cooperation restriction head body 2 along the horizontal direction motion first fixed part 8 through with the cooperation of second fixed part 9 can prevent that head body 2 from removing along the horizontal direction, avoid the phenomenon of head body 2 and pipe fitting 1 dislocation to take place.
Preferably, a sealing gasket 10 is arranged between the first fixing portion 8 and the second fixing portion 9, the cross section of the sealing gasket 10 is L-shaped, and the L-shaped sealing gasket 10 is arranged in a gap between the first fixing portion 8 and the second fixing portion 9, so that the sealing performance of connection between the first fixing portion 8 and the second fixing portion 9 is improved.
Preferably, the inner wall of the pipe fitting 1 and the outer wall of the fixing sleeve 3 are both provided with a nitriding layer 11, the thickness of the nitriding layer 11 is 0.2-0.35 mm, and the nitriding layer 11 can effectively increase the wear resistance of the inner wall of the pipe fitting 1 and the fixing sleeve 3, so that the service life of the equipment is prolonged.
Preferably, a reinforcing ring 12 is arranged between the fixing sleeve 3 and the end socket body 2, the reinforcing ring 12 is uniformly arranged along the joint of the fixing sleeve 3 and the end socket body 2, and the reinforcing ring 12 can increase the connecting strength between the fixing sleeve 3 and the end socket body 2 and increase the overall structural stability of the invention.
As preferred, still can increase the joint strength between fixed sleeve 3 and the head body 2 through the mode that sets up strengthening rib 13, be provided with strengthening rib 13 between fixed sleeve 3 and the head body 2, the quantity that sets up of strengthening rib 13 is two at least, and the axis of strengthening rib 13 relative fixed sleeve 3 is the axisymmetric setting.
The working process of the invention is as follows: in one embodiment, the end socket body 2 is reversely buckled on the pipe fitting 1, the bottom of the peripheral edge of the end socket body 2 is tightly attached to the top end surface of the pipe fitting 1, the bottom of the end socket body 2 is provided with a fixed sleeve 3 matched with the pipe fitting 1, reinforcing rings 12 are uniformly arranged along the joint of the fixed sleeve 3 and the end socket body 2 to increase the connecting strength between the fixed sleeve 3 and the end socket body 2 and further increase the overall structural stability of the invention, the fixed sleeve 3 and the end socket body 2 are coaxially arranged, one end of the fixed sleeve 3 and the bottom of the end socket body 2 are mutually connected and extend towards the direction of the pipe fitting 1, the top of the pipe fitting 1 is provided with a first mounting hole 4, the first mounting hole 4 is provided with internal threads, the periphery of the end socket body 2 is provided with at least two bearing platforms 5, the bearing platforms 5 protrude out of the outer surface of the end socket body 2, the, the first through hole 6 is provided with internal threads matched with the internal threads of the first mounting hole 4, the first through hole 6 and the first mounting hole 4 are internally provided with a fastening bolt 7, the fastening bolt 7 is provided with external threads matched with the internal threads of the first through hole 6, the fastening bolt 7 penetrates through the first through hole 6 through the matching of the external threads, the internal threads of the first through hole 6 and the internal threads of the first mounting hole 4 and is abutted against the first mounting hole 4 to connect the end socket body 2 and the pipe fitting 1, the traditional end socket assembly and the pipe fitting 1 are fixedly connected in a welding mode for one time, when the end socket fails, the end socket is not convenient to replace or maintain, the invention arranges a fixing sleeve 3 at the bottom of the end socket body 2, the fixing sleeve 3 is matched with the pipe fitting 1 to be connected, and can be connected through the threads, when the invention is installed, the method comprises the steps of firstly buckling the method to a pipe fitting 1 to be connected, then screwing the method to enable a fixing sleeve 3 to gradually penetrate into the pipe fitting 1, enabling the bottom of the periphery of an end socket body 2 to be tightly attached to the top of the pipe fitting 1, arranging a plurality of bearing platforms 5 at the periphery of the end socket body 2, arranging first through holes 6 on the bearing platforms 5, arranging first mounting holes 4 matched with the first through holes 6 at the top of the pipe fitting 1, penetrating fastening bolts 7 through the first through holes 6 and abutting against the first mounting holes 4, and fastening the end socket body 2 and the pipe fitting 1 to finish the installation of the method.
In another embodiment, a plurality of reinforcing ribs 13 are uniformly arranged along the direction of the joint of the fixing sleeve 3 and the end socket body 2, one end of each reinforcing rib 13 is connected with the fixing sleeve 3, the other end of each reinforcing rib is connected with the bottom of the end socket body 2, the connection strength between the fixing sleeve 3 and the end socket body 2 is increased, the overall structural stability of the invention is further increased, the fixing sleeve 3 and a pipe fitting 1 to be connected are matched with each other and can be connected through threads, when the invention is installed, the invention is firstly buckled to the pipe fitting 1 to be connected, then the invention is screwed, so that the fixing sleeve 3 gradually penetrates into the pipe fitting 1, the bottom of the periphery of the end socket body 2 is tightly attached to the top of the pipe fitting 1, a plurality of bearing platforms 5 are arranged at the periphery of the end socket body 2, the bearing platforms 5 are provided with first through holes 6, the top of the pipe fitting 1 is provided with first installation holes 4, and (3) penetrating the fastening bolt 7 through the first through hole 6 and abutting against the first mounting hole 4 to fasten the end socket body 2 and the pipe fitting 1.
In the description herein, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, should not be construed as limiting the invention. In the description herein, it is to be noted that, unless expressly stated or limited otherwise, the terms "connected" and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; the connection may be mechanical or electrical, and may be direct or indirect via an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
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 performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (6)

1. The end socket device applied to the large-diameter pipe fitting container comprises an end socket body (2) covering the pipe fitting (1), and is characterized in that the end socket body (2) is bowl-shaped and is inversely buckled on the pipe fitting (1), the bottom of the peripheral edge of the end socket body (2) is tightly attached to the top end surface of the pipe fitting (1), a fixing sleeve (3) matched with the pipe fitting (1) is arranged at the bottom of the end socket body (2), the fixing sleeve (3) and the end socket body (2) are coaxially arranged, one end of the fixing sleeve (3) and the bottom of the end socket body (2) are mutually connected and extend towards the direction of the pipe fitting (1), a first mounting hole (4) is formed in the top of the pipe fitting (1), an internal thread is arranged in the first mounting hole (4), at least two bearing platforms (5) are arranged on the periphery of the end socket body (2), and the bearing platforms (5) protrude out of the outer surface of the end socket body (2), cushion cap (5) are provided with first through-hole (6), first through-hole (6) are provided with the internal thread that matches each other with the internal thread of first mounting hole (4), are provided with fastening bolt (7) in first through-hole (6) and first mounting hole (4), fastening bolt (7) are provided with the external screw thread that matches each other with the internal thread of first through-hole (6), and fastening bolt (7) run through first through-hole (6) and support in first mounting hole (4) with connection head body (2) and pipe fitting (1) through the internal thread of external screw thread and first through-hole (6) and the internal thread cooperation of first mounting hole (4).
2. A sealing head device applied to a large-diameter pipe container as claimed in claim 1, wherein a first fixing part (8) is arranged on the top end face of the pipe (1), a second fixing part (9) matched with the first fixing part (8) is arranged at the bottom of the peripheral edge of the sealing head body (2), and the second fixing part (9) is matched with the first fixing part (8) to limit the movement of the sealing head body (2) along the horizontal direction.
3. A closure device applied to a large-diameter pipe container according to claim 1, wherein a sealing gasket (10) is arranged between the first fixing portion (8) and the second fixing portion (9), and the cross section of the sealing gasket (10) is L-shaped.
4. A capping device applied to a large-caliber pipe container as claimed in any one of claims 1 to 3, wherein the inner wall of the pipe (1) and the outer wall of the fixing sleeve (3) are both provided with a nitrided layer (11), and the thickness of the nitrided layer (11) is 0.2-0.35 mm.
5. A sealing head device applied to a large-diameter pipe fitting container as claimed in claim 1, wherein a reinforcing ring (12) is arranged between the fixing sleeve (3) and the sealing head body (2), and the reinforcing ring (12) is uniformly arranged along the joint of the fixing sleeve (3) and the sealing head body (2).
6. A sealing head device applied to a large-diameter pipe container according to claim 1, wherein reinforcing ribs (13) are arranged between the fixing sleeve (3) and the sealing head body (2), the number of the reinforcing ribs (13) is at least two, and the reinforcing ribs (13) are arranged in axial symmetry with respect to the axis of the fixing sleeve (3).
CN201910969205.3A 2019-10-12 2019-10-12 End enclosure device applied to large-diameter pipe fitting container Withdrawn CN110715136A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910969205.3A CN110715136A (en) 2019-10-12 2019-10-12 End enclosure device applied to large-diameter pipe fitting container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910969205.3A CN110715136A (en) 2019-10-12 2019-10-12 End enclosure device applied to large-diameter pipe fitting container

Publications (1)

Publication Number Publication Date
CN110715136A true CN110715136A (en) 2020-01-21

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CN201910969205.3A Withdrawn CN110715136A (en) 2019-10-12 2019-10-12 End enclosure device applied to large-diameter pipe fitting container

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223335A (en) * 1923-07-30 1924-10-23 John Sharrocks Improvements in stoppers for water mains and the like
US20020180214A1 (en) * 2001-05-30 2002-12-05 Fiebig Klaus Dieter End-sided closure of a pipe
EP2213925A1 (en) * 2009-01-30 2010-08-04 Roberto Ravetti Electroweldable fitting made of polyethylene for big-diameter ducts
CN203770892U (en) * 2014-01-21 2014-08-13 江阴普洋法兰有限公司 Flange connector for pipeline
CN205350705U (en) * 2015-12-04 2016-06-29 潘珺珺 Stable form blind plate
CN205877580U (en) * 2016-06-27 2017-01-11 永嘉县特富隆防腐设备有限公司 Blind flange
CN206770866U (en) * 2017-05-05 2017-12-19 天津市海王星海上工程技术股份有限公司 A kind of plugging device for non-adherent flexible pipe bulge test
WO2018100022A1 (en) * 2016-12-01 2018-06-07 Fmc Kongsberg Subsea As Flange coupling
CN108662345A (en) * 2018-04-29 2018-10-16 张多梅 A kind of end enclosure structure for pvc pipelines tail portion

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB223335A (en) * 1923-07-30 1924-10-23 John Sharrocks Improvements in stoppers for water mains and the like
US20020180214A1 (en) * 2001-05-30 2002-12-05 Fiebig Klaus Dieter End-sided closure of a pipe
EP2213925A1 (en) * 2009-01-30 2010-08-04 Roberto Ravetti Electroweldable fitting made of polyethylene for big-diameter ducts
CN203770892U (en) * 2014-01-21 2014-08-13 江阴普洋法兰有限公司 Flange connector for pipeline
CN205350705U (en) * 2015-12-04 2016-06-29 潘珺珺 Stable form blind plate
CN205877580U (en) * 2016-06-27 2017-01-11 永嘉县特富隆防腐设备有限公司 Blind flange
WO2018100022A1 (en) * 2016-12-01 2018-06-07 Fmc Kongsberg Subsea As Flange coupling
CN206770866U (en) * 2017-05-05 2017-12-19 天津市海王星海上工程技术股份有限公司 A kind of plugging device for non-adherent flexible pipe bulge test
CN108662345A (en) * 2018-04-29 2018-10-16 张多梅 A kind of end enclosure structure for pvc pipelines tail portion

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Application publication date: 20200121