High-low pressure pilot

Details High-low pressure pilot High-low pressure pilot

1985-04-22

1986-10-14

Cohan, Alan

Fluid handling

Pressure modulating relays or followers

Plural series units

251 86, G05D 1600

Patent

active

046166700

ABSTRACT:
An extremely accurate and reliable fluid pressure sensor for monitoring process pressure and sensing when predetermined pressure set points or limits have been reached. A Bourdon tube with a pivotally moving lever end responds to the process pressure. When the process pressure is within the desired pressure range, a fluid operated block and bleed relay is operated to provide a first pressure level at its outlet. As the preset pressure point is reached, the relay is operated to provide a change in the outlet pressure level for actuating suitable safety units. A pivoting beam responds to pivoting movement of the Bourdon tube lever arm about the pressure set points and effectively amplifiers or increases such movement to rapidly operate the relay. Snap-acting cap means with a self-aligning disc cap a nozzle port in the relay in response to pivoting beam movement.

REFERENCES:
patent: 2740425 (1956-04-01), Garland
patent: 2809010 (1957-10-01), Ipsen
patent: 3145722 (1964-08-01), Mueller
patent: 3297044 (1967-01-01), Thorburn
patent: 3511270 (1970-05-01), Fehrenbach
patent: 3878863 (1975-04-01), Snyder

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