Double-disc gate valve [electronic resource]
Double-Disc; Gate; Valve; Relates; Improvement; Conventional; Double-Disc; Gate; Valve; Vertically; Movable; Gate; Assembly; Including; Wedge; Spreaders; Slidably; Engaged; Therewtih; Valve; Disc; Carried; Spreaders; Gate; Assembly; Lowered; Selected; Valve; Casing; Valve; Discs; Moved; Transversely...
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Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Oak Ridge, Tenn. : Oak Ridge, Tenn. :
Oak Ridge National Laboratory. ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1979.
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| Summary: | Double-Disc; Gate; Valve; Relates; Improvement; Conventional; Double-Disc; Gate; Valve; Vertically; Movable; Gate; Assembly; Including; Wedge; Spreaders; Slidably; Engaged; Therewtih; Valve; Disc; Carried; Spreaders; Gate; Assembly; Lowered; Selected; Valve; Casing; Valve; Discs; Moved; Transversely; Outward; Close; Inlet; Outlet; Ports; Casing; Valve; Hold-Down; Means; Guiding; Disc-And-Spreader; Assemblies; Moved; Transversely; Outward; Inward; Valves; Operated; Relatively; Differential; Pressures; Sometimes; Jam; Jamming; Gate; Valves; Gaseous; Diffusion; Plants; Separtion; Uranium; Isotopes; Based; Finding; Above-Mentioned; Jamming; Results; Outlet; Disc; Tilts; Horizontal; Axis; Valve; Accordance; Tilting; Outlet; Disc; Maintained; Tolerable; Value; Providing; Disc; Rigid; Downwardly; Extending; Providing; Casing; Stop; Limiting; Inward; Arcuate; Movement; Preselected; Value; Valve; Valve Disc; Valve Disc; Outlet Ports; Downwardly Extending; Differential Pressure; Assembly Including; Preselected Value; Gaseous Diffusion; Gate Valve; Gate Valve; Gate Valve; Valve Discs; Slidably Engage; Valve Casing; Vertically Movable; Horizontal Axis; Double-Disc Gate; Double-Disc Gate; Slidably Engaged; Gate Valves; Selected Value; Diffusion Plant. |
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| Abstract: | This invention relates to an improvement in a conventional double-disc gate valve having a vertically movable gate assembly including a wedge, spreaders slidably engaged therewtih, a valve disc carried by the spreaders. When the gate assembly is lowered to a selected point in the valve casing, the valve discs are moved transversely outward to close inlet and outlet ports in the casing. The valve includes hold-down means for guiding the disc-and-spreader assemblies as they are moved transversely outward and inward. If such valves are operated at relatively high differential pressures, they sometimes jam during opening. Such jamming has been a problem for many years in gate valves used in gaseous diffusion plants for the separtion of uranium isotopes. The invention is based on the finding that the above-mentioned jamming results when the outlet disc tilts about its horizontal axis in a certain way during opening of the valve. In accordance with the invention, tilting of the outlet disc is maintained at a tolerable value by providing the disc with a rigid downwardly extending member and by providing the casing with a stop for limiting inward arcuate movement of the member to a preselected value during opening of the valve. |
| Item Description: | Published through SciTech Connect. 01/01/1979. "us 4134571" Wheatley, Seth J. |