Set point change-over circuit for fluid control valves

Details Set point change-over circuit for fluid control valves Set point change-over circuit for fluid control valves

1985-11-08

1987-07-21

Weldon, Ulysses

Communications: electrical

Continuously variable indicating

With meter reading

364510, 364139, 364140, H04Q 100, G05B 1502, G05B 1101, G06G 757

Patent

active

046821660

ABSTRACT:
A circuit for change-over of electric signal set points applied as control inputs to a fluid control valve for controlling the pressure or flow rate of a fluid. A priority circuit including a priority encoder or priority chain is provided in an input section for set point select and change-over instruction signals from an external sequential controller. When two or more of the instruction signals are applied simultaneously, only the highest priority instruction is received to select the desired set point and the other instructions are ignored.

REFERENCES:
patent: 3886418 (1976-05-01), Austin et al.
patent: 4176395 (1979-11-01), Evelyn-Veere et al.
patent: 4417312 (1983-11-01), Cronin et al.
patent: 4428046 (1984-01-01), Chari et al.
patent: 4573114 (1986-02-01), Ferguson et al.
patent: 4576570 (1986-03-01), Adams et al.
patent: 4577280 (1986-03-01), Putman

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