Fluid handling – Systems – Multi-way valve unit
Reexamination Certificate
2011-04-12
2011-04-12
Rivell, John (Department: 3753)
Fluid handling
Systems
Multi-way valve unit
C251S283000
Reexamination Certificate
active
07921876
ABSTRACT:
A rotary control valve and associated actuator control system. An actuator control system comprises a rotary control valve including a generally planar face seal, and an actuator operatively connected to the rotary control valve. Another actuator control system comprises a control valve including multiple faces having multiple ports formed therein. Fluid communication is selectively permitted and prevented between the ports in response to relative displacement between the faces. A differential area is configured to apply a biasing force which maintains sealing engagement between the faces, and which increases in response to an increase in pressure applied to the control valve.
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Wright Adam D.
Zeller Vincent P.
Halliburton Energy Service,s Inc.
Rivell John
Smith Marlin R.
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