Fluid handling – Line condition change responsive valves – Pilot or servo controlled
Reexamination Certificate
2006-02-07
2010-02-16
Rivell, John (Department: 3753)
Fluid handling
Line condition change responsive valves
Pilot or servo controlled
C251S129040
Reexamination Certificate
active
07661439
ABSTRACT:
Systems and processes may provide improved performance for a pneumatic positioner during a safety override. In certain implementations, a system and process may include the ability to receive an input control signal, power control circuitry of the pneumatic positioner using the input control signal, and generate a control signal for a signal-to-pressure converter with the control circuitry based at least partially on the input control signal. The system and process may also include the ability to detect an unsafe operating condition for the pneumatic positioner based on an input signal and modify the control signal in response to detecting the unsafe operating condition, to cause the converter to transition to a safe state. The system and process may additionally include the ability to allow the control circuitry to continue being powered by the input control signal while the converter is in the safe state.
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Chester Mark V.
Legere Alex J.
Levesque Peter S.
Dresser, Inc.
Fish & Richardson P.C.
McCalister William
Rivell John
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