Breathing apparatus

Details Breathing apparatus Breathing apparatus

1981-10-06

1984-03-20

Cohen, Lee S.

Surgery

Respiratory method or device

Means for supplying respiratory gas under positive pressure

12820524, 1375137, 137DIG9, A62B 704

Patent

active

044374607

ABSTRACT:
A single stage demand valve for passing air from a cylinder of compressed air to a face mask includes a main valve member and a by-pass valve. The by-pass valve is provided to deliver air to the face mask should the main valve member stick or seize in the closed position. The by-pass valve is a constant pressure reduction valve, having a valve member in the form of a piston, whereby variations in air pressure in the breathable gas from the cylinder are compensated ensuring that the desired flow rate or air through the by-pass valve is maintained without repeated adjustment of the by-pass valve, as in the prior art.

REFERENCES:
patent: 3028860 (1962-04-01), Gagnan et al.
patent: 4178961 (1979-12-01), Warncke

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