Pressure change responsive device

Details Pressure change responsive device Pressure change responsive device

1978-12-21

1980-12-02

Tolin, Gerald P.

Electricity: circuit makers and breakers

Fluid pressure

Diaphragm

200 83L, 73729, H01H 3532

Patent

active

042373549

ABSTRACT:
A pressure switch unit capable of withstanding high pressures without losing its low pressure sensitivity or calibration includes a magnetically actuated switch responsive to the magnetic field of a permanent magnet mounted on a hermetically sealed bellows which contains on its interior a substantially incompressible liquid. The amount of liquid hermetically sealed within the bellows is selected to be sufficient to prevent any portion of the bellows from exceeding its elastic limit when the bellows is compressed by exposure to excessively high pressures.

REFERENCES:
patent: 2355894 (1944-08-01), Ray
patent: 2411577 (1946-11-01), Leslie
patent: 3809835 (1974-05-01), Watt
patent: 3852546 (1974-12-01), Maxwell, Jr.
patent: 3946175 (1976-03-01), Sitabkhan
patent: 3982217 (1976-09-01), Reynolds

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