Water-proof air-pressure equalizing valve

Details Water-proof air-pressure equalizing valve Water-proof air-pressure equalizing valve

1976-03-18

1978-01-31

Cohan, Alan

Fluid handling

Diverse fluid containing pressure systems

Fluid separating traps or vents

55524, 179179, 174 16R, H04M 103

Patent

active

040710408

ABSTRACT:
A water-proof air-pressure equalizing valve for an enclosure capable of being pressurized to match a wide range of ambient air pressures including that corresponding to the pressure of several feet of water when totally submerged, such as the instrument housing of a military-type field telephone set, comprises a sandwich structure having a thin air-permeable hydrophobic membrane clamped between two rigid perforated sheets providing mechanical support against deformation due to water or air pressure.

REFERENCES:
patent: 3033911 (1962-05-01), Duddy
patent: 3229023 (1966-01-01), Bolton
patent: 3326230 (1967-06-01), Frank
patent: 3694566 (1972-09-01), Thompson
patent: 3719197 (1973-03-01), Pannier

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