Breathing demand regulations

Details Breathing demand regulations Breathing demand regulations

1993-04-06

1994-10-04

Burr, Edgar S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820426, 137494, 137 811, A61M 1500

Patent

active

053516826

ABSTRACT:
An aircrew breathing regulator having facility for mixing ambient air with oxygen-enriched breathing gas in supplying breathing gas to an end user, includes a demand valve connected between an inlet for receiving oxygen-enriched breathing gas and an outlet for delivering breathing gas to the end user. Ambient air is entrained by flow of oxygen-enriched breathing gas through an injector nozzle to enter an ambient air inlet and mix with the oxygen-enriched breathing gas downstream of the demand valve. Pressure build-up downstream of the demand valve resulting from the flow restricting effect of the injector nozzle causes a pressure feedback onto a head of the valve tending to force it closed. This is overcome by nullifying the action on the demand valve of downstream pressure so that the valve is pressure balanced.

REFERENCES:
patent: 4651728 (1987-03-01), Gupta et al.
patent: 4856507 (1989-08-01), Ouillon et al.
patent: 4858606 (1989-08-01), Hamlin
patent: 4919124 (1990-04-01), Stevenson et al.
patent: 5199426 (1993-04-01), Aldworth et al.
patent: 5247926 (1993-09-01), Harral

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