Pneumatic pressure controller

Details Pneumatic pressure controller Pneumatic pressure controller

1992-04-15

1992-11-17

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

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

G05D 1606

Patent

active

051634643

ABSTRACT:
A motion balanced pneumatic pressure controller comprised of a tubular housing having a diaphragm for sensing a process pressure on one side and a second diaphragm for sensing a pneumatic output signal on the other side; both diaphragms are connected by a stem passing the length of said housing and having valving means attached to open or close a bleed port within the second diaphragm to modulate a pneumatic signal pressure derived from compressed air passing a primary adjustable restriction in direct proportion to the movements of the first diaphragm, such movements being the results of process fluid pressure changes on the first diaphragm being supported by the force of adjustable springs.

REFERENCES:
patent: 3169402 (1965-02-01), Baker
patent: 3661164 (1972-05-01), Kreuter
patent: 4219042 (1980-08-01), St. Laurent
patent: 4949754 (1990-08-01), Tamamori

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