Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Reexamination Certificate
2006-04-04
2006-04-04
Look, Edward K. (Department: 3751)
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
C251S028000, C251S057000, C060S415000
Reexamination Certificate
active
07021602
ABSTRACT:
A hydraulic control system for a valve actuator comprising a first control valve that regulates fluid communication from a fluid pressure source to a first fluid supply tank that is fluidly connected to the valve actuator. A second control valve regulates fluid communication from the fluid pressure source to a second fluid supply tank that is fluidly connected to the valve actuator. A flow control member regulates fluid communication between the first and second fluid supply tanks and an exhaust valve that regulates fluid communication between the first and second fluid supply tanks and an outlet.
REFERENCES:
patent: 2896582 (1959-07-01), Justice
patent: 3648458 (1972-03-01), McAlister
patent: 4460152 (1984-07-01), DiPasquale et al.
patent: 6494434 (2002-12-01), Geiser
Ard Daryl L.
Arriens Frank J.
Davis Albert S.
Mefford David R.
Saldivar John M.
Bielinski Peter
Conley & Rose, P.C.
Cooper Cameron Corporation
Fristoe Jr. John K.
Look Edward K.
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