Fluid handling – Processes – Involving pressure control
Patent
1992-04-21
1993-03-30
Cohan, Alan
Fluid handling
Processes
Involving pressure control
137 84, 251 26, G05D 1600
Patent
active
RE0342025
ABSTRACT:
This invention relates to a pneumatic control device having an operating mode selecting means for operating in either the manual or automatic modes. Pneumatic pressure is regulated in the manual mode by a hand operated leakport, and in the automatic mode by a voice coil or other pressure regulating device. The pneumatic input supply, manual pressure regulating means and voice coil all communicate at a common surface. The mode selecting means slides across this common surface to connect together the pneumatic input supply with one of the selected pressure regulating means.
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Control Engineering, vol. 18, No. 8, Aug. 1971, New York, U.S.A. pp. 48-51, P. S. Buckley, Designing Override and Feedforward Controls.
Cohan Alan
Johnson Service Company
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