Valves and valve actuation – Fluid actuated or retarded – Fluid and non-fluid actuators
Reexamination Certificate
2005-08-02
2005-08-02
Keasel, Eric (Department: 3754)
Valves and valve actuation
Fluid actuated or retarded
Fluid and non-fluid actuators
C251S063600, C251S328000, C251S360000, C166S373000
Reexamination Certificate
active
06923423
ABSTRACT:
A gate valve comprises a valve body, a stem bore which extends through the valve body, a stem which is disposed in the stem bore and which includes a first stem portion that is sealed to the stem bore, a second, smaller diameter stem portion that is sealed to the stem bore, and a gate pocket that is located between the first and second stem portions, and gate which is disposed within the gate pocket between the first and second seats.
REFERENCES:
patent: 3635436 (1972-01-01), Tillman
patent: 3933338 (1976-01-01), Herd et al.
patent: RE30115 (1979-10-01), Herd et al.
patent: 4230299 (1980-10-01), Pierce, Jr.
patent: 4467833 (1984-08-01), Satterwhite et al.
patent: 4572298 (1986-02-01), Weston
patent: 4809733 (1989-03-01), Hawkins
patent: 6145594 (2000-11-01), Jones
patent: 2152748 (1973-04-01), None
patent: 0 624 711 (1994-11-01), None
patent: 2 369 176 (2002-05-01), None
Bartlett Christopher D.
Cain David E.
Cunningham Christopher E.
Glidden Gregory L.
Hernandez Philip
FMC Technologies Inc.
Keasel Eric
Query, Jr. Henry C.
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