Compact controller for control valve

Details Compact controller for control valve Compact controller for control valve

1995-08-17

1997-10-21

Michalsky, Gerald A.

Fluid handling

Line condition change responsive valves

Pilot or servo controlled

1374875, F16K 31128, G05D 706

Patent

active

056786018

ABSTRACT:
A compact controller controls a control valve, wherein the control valve is actuated by a pneumatic actuator. The controller comprises control electronics for generating a control deviation signal. The control deviation signal is derived from the difference between an electrical standard set value signal and a converted electrically measured value signal. The converted electrically measured value signal is a measured value signal, the measured valve signal being a signal corresponding to a value of a predetermined process variable. An electropneumatic (E/P) signal transducer converts the control deviation signal into a pneumatic pressure signal for the pneumatic actuator. Thus, the controller provides control to the control valve, and further the controller is directly flanged to the pneumatic actuator.

REFERENCES:
patent: 2536184 (1951-01-01), Johnson
patent: 4481967 (1984-11-01), Frick
patent: 4509403 (1985-04-01), Gassman et al.
patent: 4534376 (1985-08-01), Brown
patent: 4665938 (1987-05-01), Brown et al.
patent: 5469877 (1995-11-01), Askew
patent: 5549137 (1996-08-01), Lenz et al.

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