Pneumatic controller

Details Pneumatic controller Pneumatic controller

1979-03-29

1980-11-04

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

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

137 85, G05D 1600

Patent

active

042313856

ABSTRACT:
A housing has an internal opening or cavity within which is a body. Both the opening and body have a relatively large cylindrical median portion and two smaller cylindrical end portions. Three annular diaphragms interconnect the housing and the body and divide that portion of the remaining opening between the two into four gas pressure chambers. The two end chambers are connected through respective ports in the body to pressures representing commanded value and actual value respectively. The two central chambers are connected through respective ports in the body to pressures representing negative feedback and positive feedback respectively. A fifth port communicating with the negative feedback chamber serves as an output pressure port.

REFERENCES:
patent: 2638911 (1953-05-01), Griswold
patent: 2711754 (1955-06-01), McKinney
patent: 2755812 (1956-07-01), Garnett
patent: 2985183 (1961-05-01), Peatross
patent: 3169402 (1965-02-01), Baker
patent: 3661164 (1972-05-01), Kreuter

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