Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1989-12-29
1991-04-30
Fox, John C.
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
251188, F16K 504
Patent
active
050111159
ABSTRACT:
Self supporting, non-lubricated retractable seal double block and bleed plug valve wherein an improved plug configuration provides direct bearing surface support for the plug along at least a portion of the radial surface of the plug. The remaining radial surface of the plug may be optionally relieved to avoid scuffing the swept seating area of the interior valve body surface. By utilizing the novel plug configuration for direct plug bearing support, the present invention obviates the need for a lower trunnion and does away with the need for high load-bearing bushings. In all other respects, the operation of a plug valve, utilizing the plug of the present invention, remains substantially the same as it would be for a prior art plug valve. In fact, it is possible to substitute a novel plug configuration of the present invention for a prior art plug configuration for retrofitting existing valves of the type herein disclosed.
REFERENCES:
patent: 426635 (1890-04-01), Burr
patent: 733905 (1903-07-01), Erdman
patent: 2372869 (1945-04-01), Wheatley, Sr.
patent: 2596075 (1952-05-01), Heinen
patent: 2612340 (1952-09-01), Laurent
patent: 3011513 (1961-12-01), Heinen
patent: 3362433 (1968-01-01), Heinen
Smith Gordon M.
Van Der Wiel Hans M.
Fox John C.
Johnston Pump/General Valve Inc.
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