US1814677A - Stopper for pipe lines - Google Patents
Stopper for pipe lines Download PDFInfo
- Publication number
- US1814677A US1814677A US449542A US44954230A US1814677A US 1814677 A US1814677 A US 1814677A US 449542 A US449542 A US 449542A US 44954230 A US44954230 A US 44954230A US 1814677 A US1814677 A US 1814677A
- Authority
- US
- United States
- Prior art keywords
- bulb
- stopper
- tube
- main
- opening
- 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.)
- Expired - Lifetime
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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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/10—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with inflatable member
Definitions
- This invention relates to improvements in stoppers for pipe lines and more particularly to an inflatable stopper for gas pipes.
- One of the objects of the invention is the a provision of a pipe stopper which can be quickly and easily inserted through a tap opening in a gas main and inflated in order to provide a stopper for the main and includes means for properly retaining the inllated member securely in the main so as to provide an eflicient stopper.
- a stopper of this character which includes an inflatable bulb applied to a comparatively rigid stem, the bulb being inserted into a gas main through an opening tapped for the purpose and the rigid tube retained in operative position by means of a stopper adapted to be fitted in the tapped opening 29 around the tube, so as to properly center the bulb with respect to the main and then inflate the bulb until the exterior thereof is brought into intimate contact with the inner wall of the main, thus forming a complete stopper for the gas main.
- Figure 1 is a side elevation of my improved device, illustrating a portion of the gas main in cross section; and showing how the device placed in position, and
- Figure 2 is a similar View with the improved stopper in operative position.
- 1 indicates a gas main and at any desired point within the main there 1s a tap opening 2.
- the stoppers in use at the present time which include an inflatable bulb, usually have attached thereto a flexible tube which is inserted through the opening 2 in the gas main and, consequently, it is rather difficult to properly center the bulb so that when it is inflated, it will provide an effic ent stopper,
- the mam ob ects of this invention to provide improved means for 0 properly centering the bulb in the gas maln sothat when it is inflated, it will have its exterior moved into intimate contact with the interior ofthe pipe or main, and the in, flation will equalize this contact throughout the circumference of the bulb due to the proper centering of the bulb by means of the stem attached thereto.
- the bulb 3 is preferably of rubberand adapted to be inflated to the position shown in Figure 2.
- the bulb has a flexible tubular stem 4 and passed through this stem is one end of an angular tube 5 which extends into the bulb 3 and projects nearly the full length of the bulb,- as illustrated in Figure 2, while the other end of the tube 5 passes out through the opening 2 and is connected to a valve 6 which controls the pressure of air through the conduit Z that leads to the usual type of pump.
- the bulb 3 in its deflated position can be rolled around one end of the tube 5 and inserted through the opening 2, as shown in Figure 1.
- a plug 8 is mounted upon one end of the tube 5 and is adapted to fit within the opening 2.
- This plug 8 is slidably mounted upon the tube 5 so that as soon as the tube is properly positioned with regard to the center of the gas main, the plug 8 is fitted within the opening 2 for retaining the tube in proper position.
- valve 6 After the inner end of the tube and the bulb 3 have been properly centered with respect to the gas main, air is admitted into the tube 5 by means of the valve 6, and as soon as the tube has been inflated, the valve can be turned to cut off the supply of air and, if found desirable, the conduit 7 can be removed from the valve portion and the bulb 3 all-owed to remain in the pipe or main.
- the bulb Upon deflation, the bulb can be easily removed by tilting the tube 5 to the position shown in Figure 1. It has been found that by using a comparatively stiff tube for supporting the bulb in position that the bulb can be quickly centered and retained in a central position by means of the plug 8, and when the bulb is inflated it will provide a very eflicient stopper for the gas main.
- the device is extremely simple and can be manufactured and placed on the market at a very low cost, and as the tube 5 is a comparatively rigid tube, it will securely hold the bulb 3 in a central position and prevent the same from moving about while being inflated, so that when it is inflated, the exterior thereof will contact equally throughout the inner circumference of the gas main.
- One of the principal advantages of this invention is the fact that the bulb can be inserted into the gas main and the plug 8 can then be positioned in the tap opening 2 to cut off any gas escaping through this opening, and it will not be necessary to inflate the bulb until desired.
- the use of various types of pipe line stoppers now in the market it is necessary to immediately inflate the bulb after the same has been placed in the gas main, due to the fact that no provision is made for closing the tap opening through which the device is inserted.
- a gas main stopper including an inflatable bulb having a flexible stem, a rigid tube having one end passed through the stem and into the ball, the ends of said tube being diposed at right angles to each other with a curved portion between said ends, and a yieldable plug slidably mounted upon the other end of the tube.
Description
July 14, 1931. A. FENNEMA STOPPER FOR PIPE LINES Filed May 3, 1930 MIIZIZQES Patented July 14, 1931 UlE SAYS ALBERT FENNEMA, or KEnosnA, Wisconsin STOPPER non, rien Linus Application filed May 3, 1930. Serial No. 449,542.
This invention relates to improvements in stoppers for pipe lines and more particularly to an inflatable stopper for gas pipes.
One of the objects of the invention is the a provision of a pipe stopper which can be quickly and easily inserted through a tap opening in a gas main and inflated in order to provide a stopper for the main and includes means for properly retaining the inllated member securely in the main so as to provide an eflicient stopper.
Another object of the invention is the provision of a stopper of this character, which includes an inflatable bulb applied to a comparatively rigid stem, the bulb being inserted into a gas main through an opening tapped for the purpose and the rigid tube retained in operative position by means of a stopper adapted to be fitted in the tapped opening 29 around the tube, so as to properly center the bulb with respect to the main and then inflate the bulb until the exterior thereof is brought into intimate contact with the inner wall of the main, thus forming a complete stopper for the gas main.
VJith the above and other objects in view, the invention consists in the novel features of construction, the combination and arrange ment of parts hereinafter more fully set forth,
30 pointed out in the claim and shown in the accompanying drawings wherein:
Figure 1 is a side elevation of my improved device, illustrating a portion of the gas main in cross section; and showing how the device placed in position, and
Figure 2 is a similar View with the improved stopper in operative position.
Referring more particularly to the draw ings, 1 indicates a gas main and at any desired point within the main there 1s a tap opening 2. The stoppers in use at the present time, which include an inflatable bulb, usually have attached thereto a flexible tube which is inserted through the opening 2 in the gas main and, consequently, it is rather difficult to properly center the bulb so that when it is inflated, it will provide an effic ent stopper,
It is, therefore, one of the mam ob ects of this invention to provide improved means for 0 properly centering the bulb in the gas maln sothat when it is inflated, it will have its exterior moved into intimate contact with the interior ofthe pipe or main, and the in, flation will equalize this contact throughout the circumference of the bulb due to the proper centering of the bulb by means of the stem attached thereto. V In the present instance, the bulb 3 is preferably of rubberand adapted to be inflated to the position shown in Figure 2. The bulb has a flexible tubular stem 4 and passed through this stem is one end of an angular tube 5 which extends into the bulb 3 and projects nearly the full length of the bulb,- as illustrated in Figure 2, while the other end of the tube 5 passes out through the opening 2 and is connected to a valve 6 which controls the pressure of air through the conduit Z that leads to the usual type of pump.
It will be noted that after the opening 2 has been formed in the main 1, the bulb 3 in its deflated position can be rolled around one end of the tube 5 and inserted through the opening 2, as shown in Figure 1. In order to support the tube 5 in proper position for centering the bulb 3, a plug 8 is mounted upon one end of the tube 5 and is adapted to fit within the opening 2. This plug 8 is slidably mounted upon the tube 5 so that as soon as the tube is properly positioned with regard to the center of the gas main, the plug 8 is fitted within the opening 2 for retaining the tube in proper position. After the inner end of the tube and the bulb 3 have been properly centered with respect to the gas main, air is admitted into the tube 5 by means of the valve 6, and as soon as the tube has been inflated, the valve can be turned to cut off the supply of air and, if found desirable, the conduit 7 can be removed from the valve portion and the bulb 3 all-owed to remain in the pipe or main.
Upon deflation, the bulb can be easily removed by tilting the tube 5 to the position shown in Figure 1. It has been found that by using a comparatively stiff tube for supporting the bulb in position that the bulb can be quickly centered and retained in a central position by means of the plug 8, and when the bulb is inflated it will provide a very eflicient stopper for the gas main. The device is extremely simple and can be manufactured and placed on the market at a very low cost, and as the tube 5 is a comparatively rigid tube, it will securely hold the bulb 3 in a central position and prevent the same from moving about while being inflated, so that when it is inflated, the exterior thereof will contact equally throughout the inner circumference of the gas main.
One of the principal advantages of this invention is the fact that the bulb can be inserted into the gas main and the plug 8 can then be positioned in the tap opening 2 to cut off any gas escaping through this opening, and it will not be necessary to inflate the bulb until desired. l/Vith the use of various types of pipe line stoppers now in the market, it is necessary to immediately inflate the bulb after the same has been placed in the gas main, due to the fact that no provision is made for closing the tap opening through which the device is inserted.
\Vhile I have shown and described the preferred embodiment of my invention, it will be apparent that slight changes may be made in the construction when putting the invention into practice without departing from the spirit of the same or the scope of the appended claim.
I claim:
A gas main stopper including an inflatable bulb having a flexible stem, a rigid tube having one end passed through the stem and into the ball, the ends of said tube being diposed at right angles to each other with a curved portion between said ends, and a yieldable plug slidably mounted upon the other end of the tube.
In testimony that I claim the foregoing I have hereunto set my hand at Ken-osha, in the county of Kenosha and State of WVisconsin.
ALBERT FENNEMA.'
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US449542A US1814677A (en) | 1930-05-03 | 1930-05-03 | Stopper for pipe lines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US449542A US1814677A (en) | 1930-05-03 | 1930-05-03 | Stopper for pipe lines |
Publications (1)
Publication Number | Publication Date |
---|---|
US1814677A true US1814677A (en) | 1931-07-14 |
Family
ID=23784551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US449542A Expired - Lifetime US1814677A (en) | 1930-05-03 | 1930-05-03 | Stopper for pipe lines |
Country Status (1)
Country | Link |
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US (1) | US1814677A (en) |
Cited By (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2930396A (en) * | 1956-08-20 | 1960-03-29 | S D M Entpr Inc | Flood control means |
US2976191A (en) * | 1958-01-09 | 1961-03-21 | James C Weston | Method of killing roots adjacent sewer line joints |
US3276481A (en) * | 1964-08-13 | 1966-10-04 | Carrell S Mcnulty | Apparatus for controlling liquid flow |
US4013097A (en) * | 1974-06-28 | 1977-03-22 | Anthony Louis Calandra | Apparatus and method for damming a pipeline |
US4122869A (en) * | 1976-11-12 | 1978-10-31 | Roberson Walter H Sr | Closure plug assembly |
US4160464A (en) * | 1973-12-06 | 1979-07-10 | United Kingdom Atomic Energy Authority | Sealing members |
US4203473A (en) * | 1976-11-12 | 1980-05-20 | Roberson Walter H | Closure plug assembly |
US4923464A (en) * | 1985-09-03 | 1990-05-08 | Becton, Dickinson And Company | Percutaneously deliverable intravascular reconstruction prosthesis |
US5240031A (en) * | 1992-11-09 | 1993-08-31 | Vigil David J | Inflatable bladder valve for irrigation pipe |
US5327924A (en) * | 1990-09-12 | 1994-07-12 | British Gas Plc | Abandonment of a branch main |
US6321793B1 (en) * | 2000-06-12 | 2001-11-27 | L&L Products | Bladder system for reinforcing a portion of a longitudinal structure |
US6419305B1 (en) | 2000-09-29 | 2002-07-16 | L&L Products, Inc. | Automotive pillar reinforcement system |
US6422575B1 (en) | 2000-03-14 | 2002-07-23 | L&L Products, Inc. | Expandable pre-formed plug |
US6467834B1 (en) | 2000-02-11 | 2002-10-22 | L&L Products | Structural reinforcement system for automotive vehicles |
US6471285B1 (en) | 2000-09-29 | 2002-10-29 | L&L Products, Inc. | Hydroform structural reinforcement system |
US6474722B2 (en) | 2000-03-14 | 2002-11-05 | L&L Products | Structural reinforcement member for wheel well |
US6474723B2 (en) | 2000-03-14 | 2002-11-05 | L&L Products, Inc. | Heat activated reinforcing sleeve |
US6502821B2 (en) | 2001-05-16 | 2003-01-07 | L&L Products, Inc. | Automotive body panel damping system |
US20030201572A1 (en) * | 2002-04-26 | 2003-10-30 | L&L Products, Inc. | Insertable barrier and chamber system for reinforcement of structural members |
US6668457B1 (en) | 1999-12-10 | 2003-12-30 | L&L Products, Inc. | Heat-activated structural foam reinforced hydroform |
US6729425B2 (en) | 2001-09-05 | 2004-05-04 | L&L Products, Inc. | Adjustable reinforced structural assembly and method of use therefor |
US20040135058A1 (en) * | 2002-12-13 | 2004-07-15 | Joseph Wycech | Method and apparatus for inserting a structural reinforcing member within a portion of an article of manufacture |
US6820923B1 (en) | 2000-08-03 | 2004-11-23 | L&L Products | Sound absorption system for automotive vehicles |
US20050081383A1 (en) * | 2003-09-18 | 2005-04-21 | L&L Products, Inc. | System and method employing a porous container for sealing, baffling or reinforcing |
US6921130B2 (en) | 2000-02-11 | 2005-07-26 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US20050217785A1 (en) * | 2004-03-31 | 2005-10-06 | L&L Products, Inc. | Method of applying activatable material to a member |
US20050229985A1 (en) * | 2002-05-21 | 2005-10-20 | Keld Saxenfelt | Inflatable, flexible device for use as an expandable closure device, and a method of producing said device |
US20060065483A1 (en) * | 2004-09-29 | 2006-03-30 | L&L Products, Inc. | Baffle with flow-through medium |
US7077460B2 (en) | 2002-04-30 | 2006-07-18 | L&L Products, Inc. | Reinforcement system utilizing a hollow carrier |
WO2010051817A3 (en) * | 2008-11-06 | 2011-01-20 | Lm Glasfiber A/S | Method for a transverse filling inside an elongated narrow cavity |
KR101203687B1 (en) * | 2010-11-09 | 2012-11-21 | 전남도시가스(주) | Apparatus for shutting off the gas and the method of shut off the gas using that |
US20190338858A1 (en) * | 2018-05-01 | 2019-11-07 | Operations Technology Development, Nfp | High pressure detachable/retractable stopper plug |
SE2050684A1 (en) * | 2020-06-10 | 2021-12-11 | Noaq Flood Prot Ab | Pipe plug arrangement and method for activating such pipe plug arrangement |
-
1930
- 1930-05-03 US US449542A patent/US1814677A/en not_active Expired - Lifetime
Cited By (61)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2930396A (en) * | 1956-08-20 | 1960-03-29 | S D M Entpr Inc | Flood control means |
US2976191A (en) * | 1958-01-09 | 1961-03-21 | James C Weston | Method of killing roots adjacent sewer line joints |
US3276481A (en) * | 1964-08-13 | 1966-10-04 | Carrell S Mcnulty | Apparatus for controlling liquid flow |
US4160464A (en) * | 1973-12-06 | 1979-07-10 | United Kingdom Atomic Energy Authority | Sealing members |
US4013097A (en) * | 1974-06-28 | 1977-03-22 | Anthony Louis Calandra | Apparatus and method for damming a pipeline |
US4122869A (en) * | 1976-11-12 | 1978-10-31 | Roberson Walter H Sr | Closure plug assembly |
US4203473A (en) * | 1976-11-12 | 1980-05-20 | Roberson Walter H | Closure plug assembly |
US4923464A (en) * | 1985-09-03 | 1990-05-08 | Becton, Dickinson And Company | Percutaneously deliverable intravascular reconstruction prosthesis |
US5327924A (en) * | 1990-09-12 | 1994-07-12 | British Gas Plc | Abandonment of a branch main |
US5240031A (en) * | 1992-11-09 | 1993-08-31 | Vigil David J | Inflatable bladder valve for irrigation pipe |
US7194804B2 (en) | 1999-12-10 | 2007-03-27 | L & L Products, Inc. | Method of forming a hydroform |
US6668457B1 (en) | 1999-12-10 | 2003-12-30 | L&L Products, Inc. | Heat-activated structural foam reinforced hydroform |
US20050218697A1 (en) * | 2000-02-11 | 2005-10-06 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US6619727B1 (en) | 2000-02-11 | 2003-09-16 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US6467834B1 (en) | 2000-02-11 | 2002-10-22 | L&L Products | Structural reinforcement system for automotive vehicles |
US7160491B2 (en) | 2000-02-11 | 2007-01-09 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US6921130B2 (en) | 2000-02-11 | 2005-07-26 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US6938947B2 (en) | 2000-02-11 | 2005-09-06 | L & L Products, Inc. | Structural reinforcement system for automotive vehicles |
US20070075569A1 (en) * | 2000-02-11 | 2007-04-05 | L&L Products, Inc. | Structural reinforcement system for automotive vehicles |
US6474723B2 (en) | 2000-03-14 | 2002-11-05 | L&L Products, Inc. | Heat activated reinforcing sleeve |
US6422575B1 (en) | 2000-03-14 | 2002-07-23 | L&L Products, Inc. | Expandable pre-formed plug |
US6607238B2 (en) | 2000-03-14 | 2003-08-19 | L&L Products, Inc. | Structural reinforcement member for wheel well |
US6928736B2 (en) | 2000-03-14 | 2005-08-16 | L & L Products | Method of reinforcing an automobile structure |
US7011315B2 (en) | 2000-03-14 | 2006-03-14 | L&L Products, Inc. | Expandable pre-formed plug |
US6641208B2 (en) | 2000-03-14 | 2003-11-04 | L&L Products, Inc. | Heat activated reinforcing sleeve |
US6474722B2 (en) | 2000-03-14 | 2002-11-05 | L&L Products | Structural reinforcement member for wheel well |
US6482486B1 (en) | 2000-03-14 | 2002-11-19 | L&L Products | Heat activated reinforcing sleeve |
USRE44796E1 (en) * | 2000-06-12 | 2014-03-11 | Zephyros, Inc. | Bladder system for reinforcing a portion of a longitudinal structure |
US6321793B1 (en) * | 2000-06-12 | 2001-11-27 | L&L Products | Bladder system for reinforcing a portion of a longitudinal structure |
US6820923B1 (en) | 2000-08-03 | 2004-11-23 | L&L Products | Sound absorption system for automotive vehicles |
US6471285B1 (en) | 2000-09-29 | 2002-10-29 | L&L Products, Inc. | Hydroform structural reinforcement system |
US6575526B2 (en) | 2000-09-29 | 2003-06-10 | L&L Products, Inc. | Hydroform structural reinforcement system |
US6419305B1 (en) | 2000-09-29 | 2002-07-16 | L&L Products, Inc. | Automotive pillar reinforcement system |
US6523884B2 (en) | 2000-09-29 | 2003-02-25 | L&L Products, Inc. | Hydroform structural reinforcement system |
US6502821B2 (en) | 2001-05-16 | 2003-01-07 | L&L Products, Inc. | Automotive body panel damping system |
US20040159481A1 (en) * | 2001-09-05 | 2004-08-19 | L&L Products, Inc. | Adjustable reinforced structural assembly and method of use therefor |
US6729425B2 (en) | 2001-09-05 | 2004-05-04 | L&L Products, Inc. | Adjustable reinforced structural assembly and method of use therefor |
US6880657B2 (en) | 2001-09-05 | 2005-04-19 | L&L Products Inc. | Adjustable reinforced structural assembly and method of use therefor |
US20030201572A1 (en) * | 2002-04-26 | 2003-10-30 | L&L Products, Inc. | Insertable barrier and chamber system for reinforcement of structural members |
US7169344B2 (en) | 2002-04-26 | 2007-01-30 | L&L Products, Inc. | Method of reinforcing at least a portion of a structure |
US20030209921A1 (en) * | 2002-04-26 | 2003-11-13 | L&L Products, Inc | Insertable barrier and chamber system for reinforcement of structural members |
US8128780B2 (en) | 2002-04-30 | 2012-03-06 | Zephyros, Inc. | Reinforcement system utilizing a hollow carrier |
US7296847B2 (en) | 2002-04-30 | 2007-11-20 | Zephyros, Inc. | Reinforcement system utilizing a hollow carrier |
US7077460B2 (en) | 2002-04-30 | 2006-07-18 | L&L Products, Inc. | Reinforcement system utilizing a hollow carrier |
US20050229985A1 (en) * | 2002-05-21 | 2005-10-20 | Keld Saxenfelt | Inflatable, flexible device for use as an expandable closure device, and a method of producing said device |
US20040135058A1 (en) * | 2002-12-13 | 2004-07-15 | Joseph Wycech | Method and apparatus for inserting a structural reinforcing member within a portion of an article of manufacture |
US7290828B2 (en) | 2003-09-18 | 2007-11-06 | Zephyros, Inc. | Baffle system |
US7469459B2 (en) | 2003-09-18 | 2008-12-30 | Zephyros, Inc. | System and method employing a porous container for sealing, baffling or reinforcing |
US20050194706A1 (en) * | 2003-09-18 | 2005-09-08 | L&L Products, Inc. | System and method employing a porous container for sealing, baffling or reinforcing |
US20050081383A1 (en) * | 2003-09-18 | 2005-04-21 | L&L Products, Inc. | System and method employing a porous container for sealing, baffling or reinforcing |
US20050217785A1 (en) * | 2004-03-31 | 2005-10-06 | L&L Products, Inc. | Method of applying activatable material to a member |
US7180027B2 (en) | 2004-03-31 | 2007-02-20 | L & L Products, Inc. | Method of applying activatable material to a member |
US20060065483A1 (en) * | 2004-09-29 | 2006-03-30 | L&L Products, Inc. | Baffle with flow-through medium |
WO2010051817A3 (en) * | 2008-11-06 | 2011-01-20 | Lm Glasfiber A/S | Method for a transverse filling inside an elongated narrow cavity |
US20110225796A1 (en) * | 2008-11-06 | 2011-09-22 | Lm Glasfiber A/S | Providing a transverse filling inside and elongated narrow cavity |
KR101203687B1 (en) * | 2010-11-09 | 2012-11-21 | 전남도시가스(주) | Apparatus for shutting off the gas and the method of shut off the gas using that |
US20190338858A1 (en) * | 2018-05-01 | 2019-11-07 | Operations Technology Development, Nfp | High pressure detachable/retractable stopper plug |
US10914389B2 (en) * | 2018-05-01 | 2021-02-09 | Operations Technology Development, Nfp | High pressure detachable/retractable stopper plug |
SE2050684A1 (en) * | 2020-06-10 | 2021-12-11 | Noaq Flood Prot Ab | Pipe plug arrangement and method for activating such pipe plug arrangement |
WO2021251881A1 (en) * | 2020-06-10 | 2021-12-16 | Noaq Flood Protection Ab | Pipe plug arrangement and method for activating such pipe plug arrangement |
SE544162C2 (en) * | 2020-06-10 | 2022-02-15 | Noaq Flood Prot Ab | Pipe plug arrangement and method for activating such pipe plug arrangement |
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