Pipes and tubular conduits – With closures and plugs – Inflation stem type
Patent
1988-05-06
1990-07-17
Walton, George L.
Pipes and tubular conduits
With closures and plugs
Inflation stem type
137517, 138 93, 166187, 277 34, 405170, F16L 5510, F16K 710
Patent
active
049415115
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device with a valve function which can be brought into and out of a pipeline.
Devices with a valve function which can be brought into and out of a pipeline and parked in the same are known.
BACKGROUND ART
1. From U.S. patent document No. 3503754, for example, a pig with an axial valve system is known, where the pig can be anchored in a pipeline by means of pins which are inserted through the pipeline walls from the outside and against which the pig is secured. The pig according to the patent document shall primarily be used for shut-off of the fluid flow during brief periods of pipeline repairs etc., and can not be permanently installed.
2. From U.S. patent document No. 3746026 a blocking pig is known which features parking brakes and sealing devices for temporary shutoff of a pipeline at a predetermined point. The blocking pig, however, lacks a separate valve function, and consequently cannot be permanently installed in a pipeline either.
From DE patent document No. 3142768, an internal blocking device for a pipeline is known which comprises two flanges and a cylinder connecting these. Outside the cylinder, on the outermost part between said cylinder and the pipeline wall, an elastic tube has been installed, consisting of a rubber-type, synthetic material, which is reinforced with several layers of metal sheathing. Inside the tube, an inflatable bellow is mounted which receives pressure medium from pressure bottles located inside the cylinder. The tube and the inflatable bellow have a double function in that both shall seal off fluid which flows into the pipeline and anchor the blocking device in the pipeline. The blocking device does not feature a separate valve function, and must therefore be inserted into the pipeline each time the pipeline is to be blocked.
DISCLOSURE OF INVENTION
The object of the present invention is to provide a device with a valve function which can be brought into and out of an already existing pipeline without having to modify the pipeline, and which can be parked at the desired point and can remain there also during normal operation over an extended period. Moreover, the force exerted by the device on the pipeline during normal operation must be limited, in order to avoid local over-loading at the same time as the device must be safely anchored when the valve is closed and there is a great drop in pressure over the device. Another object is to provide a device comprising a valve which closes automatically and instantly at a given pressure difference and which can also be opened/closed at a signal. According to the invention, this is provided by a device characterized by comprising a channel for throughflowing fluid, a medium controlled and/or remote-controlled valve, a parking brake/packer seal unit which with limited force can be brought to bear against the wall of the pipeline, and a cylindrical wire anchor with an external diameter corresponding to or slightly less than that of the pipeline's internal diameter and which can be brought into pressure contact with the pipeline.
Another object is to provide a device of a simple design and low weight which is cheap in production. This can be obtained by locating the valve and parking brake in separate sections with the cylindrical wire anchor in between to connect these and with a spring shaft located in contact with the sections to keep these at a given distance from each other.
Further advantageous features of the invention will become apparent from the description below and the dependent claims.
MODES FOR CARRYING OUT THE INVENTION
In the following, the invention will be further explained with reference to an embodiment of the device which is shown on the enclosed drawing.
The FIGURE gives an example of a device according to the invention which is coupled together with a transport vehicle. The said transport vehicle is divided into three and consists of a driving carriage 42 and an energy and generator carriage 43. The energy and generator carriage 43 features a coupling ball for pos
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Johansen Trond V.
Kristjansson K. P.
Naess Ludvig
Ruch Ola
Utengen S. F.
Den Norske Stats Oljeselskap A.S
Walton George L.
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