Electropneumatic closed loop servo system for controlling variab

Details Electropneumatic closed loop servo system for controlling variab Electropneumatic closed loop servo system for controlling variab

1991-09-04

1992-10-27

Cohan, Alan

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

251 31, G05D 1620

Patent

active

051581086

ABSTRACT:
A stand-alone electropneumatic closed loop servo system, with a separate gas supply to an air actuated cylinder, provides pressure, position, or fluid flow control of a variable conductivity valve in a device by automatically varying the conductance of the device. The air cylinder defines a control chamber and a smaller volume response chamber separated by a piston operatively connected to the variable conductivity valve. The gas supply includes a constant pressure line, with a pressure regulator valve and a check valve, into the control chamber and a variable pressure line, with a variable pressure solenoid valve, into the response chamber. A feedback signal from the device to a controller is compared to a desired pressure set point. The controller signals the solenoid to vary its output pressure thereby causing the piston to move accordingly to actuate the variable conductance valve. With an air spring in the control chamber and variable pressure in the smaller second chamber, the piston seeks equilibrium by moving in the direction of the side with the least pressure.

REFERENCES:
patent: 2574414 (1951-11-01), Ragland
patent: 3155365 (1964-11-01), Hartung
patent: 3225785 (1965-12-01), Goike
patent: 4307750 (1981-12-01), Ledeen

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