Fluid handling – With repair – tapping – assembly – or disassembly means – Assembling – disassembling – or removing cartridge type valve
Patent
1991-08-08
1993-07-06
Walton, George L.
Fluid handling
With repair, tapping, assembly, or disassembly means
Assembling, disassembling, or removing cartridge type valve
13761417, 251 58, 251208, 2512495, 251315, 251316, F16K 4300, F16K 506, F16K 510
Patent
active
052248291
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention concerns a device associated with a valve, in particular a rotatable valve comprising an upper part and a lower part which are detachably joined to each other.
BACKGROUND ART
Valves of the kind mentioned above can be made sufficiently large and robust in order to be mounted onto pipelines which transport hydrocarbons, particularly subsea pipelines, but the invention can also be exploited in other environments and in smaller dimensions.
In the Norwegian patent application No. 860923, a ball valve is disclosed which is intended for connection with a pipeline system which conveys gas and/or oil at considerable sea depths. The valve can be demounted in a submerged state for instance for inspection or repair. Replacement of the internal vital parts can take place without any kind of extra cover and without the fluid in the pipeline leaking out during demounting, or without water from the surrounding environment being able to penetrate into the pipeline. This is achieved in that the rotatable member of the known valve comprises an upper part and a lower part. The upper part, which can be demounted from the valve housing, comprises, amongst other parts, the main packings of the valve. The lower part contains two displaceable sleeves which, when the valve can be demounted from the valve housing, comprises, amongst other parts, the main packings and two displaceable sleeves which, when the valve is open, are displaced outwards to engage with bearings in the valve housing, thereby forming a leakproof, continuous fluid passageway.
In pipeline systems there is often a need for devices which can regulate the fluid flow and likewise there is a need for the mounting of metering equipment for instance for volumetric metering of fluid flows.
Apparatus of the above-mentioned kind which are placed in a fluid flow, are subjected to considerable wear and tear and demand relatively frequent, periodical maintenance. It is desirable that maintenance can be performed quickly and that it should not be necessary to depressurize the pipeline. It is also desirable that medium from the pipeline will not leak out into the surrounding environment when maintenance takes place.
SUMMARY OF INVENTION
This is achieved by a valve according to the present invention which is characterized in that the lower part of the rotatable member is predominantly U-shaped with sealing surfaces arranged on the outwardly facing side-faces, which sealing surfaces are, in the case of a closed valve, engaged with the valve housing's valve seats on respectively the inlet and/or outlet end, in that the upper part's external surface is designed for totally or partly resting support against the lower part's internal surface and comprises a through-flow passage (24) intended for accommodating controlling or metering equipment, in that the upper part, in the case of closed valve, can be withdrawn from the valve housing for maintenance.
BRIEF DESCRIPTION OF DRAWINGS
The invention will be more closely described in the following, making reference to the accompanying drawings in which:
FIG. 1 shows a vertical section through a valve according to the invention when the valve is in an open position or an adjustable position,
FIG. 2 shows a horizontal section through the valve shown in FIG. 1,
FIG. 3 shows a vertical section through the valve as in FIG. 1, but with the valve in its closed position,
FIG. 4 shows a vertical section through upper part and components attached to this, after they have been lifted out of the valve chamber in connection with a maintenance operation,
FIG. 5 shows a horizontal outline of upper part and associated components which are shown in FIG. 4,
FIG. 6 shows a horizontal outline of the valve housing and lower part after the upper part has been lifted out,
FIG. 7 shows a horizontal section through the valve housing and lower part which keeps the valve closed.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
The constructive design of the valve will be described in detail with reference to the FIGS. 1-3.
REFERENCES:
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Den Norske Stats Oljeselskap A.S.
Walton George L.
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