Pneumatic controller

Details Pneumatic controller Pneumatic controller

1981-10-19

1984-06-12

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

With counter-balancing pressure feedback to the modulating...

137 86, G05D 1600

Patent

active

044535597

ABSTRACT:
A pneumatic process controller includes a nozzle mounted on a set point lever and a flapper with a connected process lever. The set point lever pivots the nozzle about a set point and input axis in response to set point adjustment. The process lever pivots the flapper about the same axis in response to the process variable. The nozzle and set point lever are mechanically separated from the flapper and process lever. Artificial effect upon the process variable from set point adjustment is eliminated.

REFERENCES:
patent: 2776670 (1957-01-01), Hunt
patent: 3047002 (1962-07-01), Jaquith
patent: 3095003 (1963-06-01), Dyson
patent: 3354895 (1967-11-01), Wisemann, Jr.
patent: 3515162 (1970-06-01), Bowditch et al.
patent: 3572360 (1971-03-01), Lloyd et al.

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