Fluid handling – With repair – tapping – assembly – or disassembly means – Assembling – disassembling – or removing cartridge type valve
Patent
1988-04-22
1990-05-01
Walton, George L.
Fluid handling
With repair, tapping, assembly, or disassembly means
Assembling, disassembling, or removing cartridge type valve
251 58, 251298, F16K 4300
Patent
active
049210033
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a quick-acting shut-down valve for use in a submerged state in water, liquids or other fluids and particularly a shut-down valve for employment in subwater/subliquid position, for instance in subsea pipelines for liquid/gas. Typically, such a valve comprises a valve housing including a cylindrical valve chamber which is intended for being orientated along the direction of flow of the liquid/gas, and a radially placed valve chamber which is closable with a removable bonnet. Generally, the valve has a clack-valve body which is movable between an active closed position, cooperating tightly with a seat in the valve housing, and an inactive position, in which the valve is open for through-flowing of liquid/gas.
So far it has been difficult to provide a shut-down valve for installation on pipelines, which is in case of an accident or major failure is able to prevent considerable amounts of hydrocarbons returning to the origin. Maintenance and change of components in valves commonly used to day are associated with considerable expenses, due to the extensive requirements being necessary for such operations.
As an example it can be mentioned that when using conventional shut-down valves on a pipeline like for instance Statpipe, the line will be filled up with water in case the valve is opened for repair. Afterwards it will take about 60 days to empty the water out of the pipeline and dry it up as well, before it can be used again for transporting gas/oil. This will involve loss of production during this period with large economical consequences.
During cleansing of the pipeline, about 200 tons of dirt/particles passes through the pipe and the valve, when sending a body with the flow through the pipe and the valve. In order to prevent this body from becoming stuck, the pipe has to be continuous without cavities and edges. It is also desirable to protect moving parts of the valve against intruding of dirt/particles and heavy hydrocarbons, since these stick to and cause corrosions and coking wherever they penetrate. Accordingly, the shut-down valve will have a design that makes it possible to lead a body/liquid/gas through a continuous "pipe" through the valve. Said body can also be a so-called "pig", which is an object which might be sent through the pipe in order to clean it, or a "linalog", which is a so-called "intelligent pig", i.e. a recording/measuring device adapted for measuring conditions in the pipe.
From FR Pat. No. 1594134 it is known a shut-down valve of the art with a shut-down clock which comprises a trunk piston able to be moved between two positions in the longitudinal direction of the conduit, in which when the trunk piston is in an advanced position, it will separate an adjoining chamber in which the valve clock is mounted on the wall of the chamber. The valve according to said French patent is particularly used in nuclear power industry.
From U.S. Pat. No. 419,074 it is known a pressure equalizing clack valve in which the valve housing comprises a cover member into which the clack can be pivoted. Said arrangement permits maintenance to be carried out on the clack through the opening of the valve housing, when the cover member is removed.
DISCLOSURE OF INVENTION
An object according to the invention is to provide a shut-down valve, in which the fluid (water/liquid) surrounding the valve, is prevented from penetrating the pipe system, which is being served by the valve, and which at the same time is able to counteract the through flowing fluid (liquid/gas) from flowing out and into the surrounding medium when the valve is undergoing maintenance, repair and/or change of components, like valve packing faces, packings, valve stem, shut-down devices etc., and this will be achieved without it being necessary to encapsulate the valve or build it into a housing, a chamber or the like or cover it in any other ways.
While the valve is in an open position, and said cover is removed, it is possible to carry out maintenance on the valve, to change components like pac
REFERENCES:
patent: 1120905 (1914-12-01), Chrisman
patent: 1818508 (1931-08-01), Scott
patent: 2877790 (1959-03-01), Wilhelm et al.
patent: 2921601 (1960-01-01), Fisher, Jr.
patent: 3557822 (1971-01-01), Chronister
patent: 3665953 (1972-05-01), Chronister
patent: 3799188 (1974-03-01), Chronister
patent: 3799258 (1974-03-01), Tausch
patent: 3845818 (1974-11-01), Deaton
patent: 4307747 (1981-12-01), Carpentier
patent: 4498492 (1985-02-01), Carpentier
patent: 4547099 (1985-10-01), Alexandrov et al.
Den norske stats olkeselskap
Walton George L.
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