Valves and valve actuation – With means to increase head and seat contact pressure – With positive reduction
Patent
1994-07-20
2000-02-22
Fox, John
Valves and valve actuation
With means to increase head and seat contact pressure
With positive reduction
744248VA, F16K 516
Patent
active
060270985
ABSTRACT:
A rotary valve assembly comprising a valve body having a fluid flow passageway in communication with the valve body cavity which comprises a rotatable closure member for selectively closing or opening the fluid flow passageway intersecting the valve body cavity. A valve operator consists of a reciprocatable and rotatable stem connected to the closure member so that the stem can reciprocate relative to the closure member and when the stem rotates, the closure member and the stem rotate together. The closure member comprises stop means to arrest movement of the stem towards the closure member in order to transmit the stem force to the closure member. A lift-and-turn mechanism or a lift-turn-and-reseat mechanism actuates the stem. In one embodiment, the stem back-seats to prevent fugitive emissions. The valve operator selectively moves the closure member to a flow closed position or to a flow open position.
REFERENCES:
patent: 1002835 (1911-09-01), Gorton
patent: 2128071 (1938-08-01), Bischoff
patent: 2149725 (1939-03-01), Cavariis
patent: 2392880 (1946-01-01), Reed
patent: 2539106 (1951-01-01), Schenck
patent: 3379405 (1968-04-01), Natho
patent: 3390861 (1968-07-01), Masheder
patent: 3515371 (1970-06-01), King et al.
patent: 3625478 (1971-12-01), Killian
patent: 3780986 (1973-12-01), Fujiwara
patent: 4930748 (1990-06-01), Gonsion
patent: 5407176 (1995-04-01), Nevrekar
"How FMC's Model ULT Plug Valve meets your requirements"--a 2-page article from the FMC company's brochure of Summer 1994.
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