Valves and valve actuation – Valve head movably connected for accommodation to seat – With universal connection
Patent
1977-11-03
1979-01-16
Wealsley, Harold W.
Valves and valve actuation
Valve head movably connected for accommodation to seat
With universal connection
251167, 251197, F16K 304
Patent
active
041345711
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.
REFERENCES:
patent: 1999155 (1935-04-01), Karnath
patent: 2895709 (1959-07-01), Rattigan
patent: 3815868 (1974-06-01), Bobo
Carlson Dean E.
Hamel Stephen D.
Lewis Fred O.
The United States of America as represented by the United States
Wealsley Harold W.
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